A catalytic flue gas desulfurization device

Abstract

The present invention discloses a catalytic flue gas desulfurization device, which can solve the technical problem of catalyst breakage due to a large temperature difference between the front and rear of the catalyst by cooling the catalyst and then washing and regenerating it. The washing and regeneration of the catalyst includes the following operations: cutting off the flue gas intake, then introducing catalyst cooling gas with a temperature lower than the flue gas temperature during desulfurization into the desulfurization reactor, allowing the catalyst cooling gas to pass through the catalyst and carry the heat in the catalyst before being discharged from the exhaust port; or spraying a coolant into the flue gas intake passage to cool the flue gas, then introducing the cooled and cooled flue gas into the desulfurization reactor, allowing the cooled and cooled flue gas to pass through the catalyst and carry the heat in the catalyst before being discharged from the exhaust port; after the catalyst is cooled to a set condition, starting a spray device, spraying a regeneration liquid onto the catalyst through the spray device to wash and regenerate the catalyst, and discharging the regeneration liquid from the drain port.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of flue gas desulfurization, and specifically to a catalyst washing and regeneration method for a catalytic flue gas desulfurization device, a regeneration liquid discharge structure for a catalytic flue gas desulfurization device, and a catalytic flue gas desulfurization tower. Background Art

[0002] Catalytic flue gas desulfurization (FGD) is a well-known and promising desulfurization technology. Its basic principle is that sulfur dioxide, water, and oxygen in the flue gas are adsorbed on a catalyst and react under the catalytic action of active components to produce sulfuric acid. When the sulfuric acid attached to the catalyst reaches a certain level, the catalyst is washed with a regeneration liquid (usually dilute sulfuric acid and / or water) to remove the sulfuric acid and release the catalytic active sites. The regeneration liquid can be reused as a byproduct (usually dilute sulfuric acid). Related references include: "Current Status and Trends of Catalytic Flue Gas Desulfurization Technology, Proceedings of the 2009 Annual Conference of the Chinese Society of Environmental Sciences, 2009, Huang Pan et al."

[0003] When catalytic flue gas desulfurization technology is applied to actual projects, a special catalytic flue gas desulfurization tower and a desulfurization reactor installed in the catalytic flue gas desulfurization tower are required. A Chinese prior application with application number 202120944544.9 (hereinafter referred to as the prior application) filed by the same applicant as this application discloses a catalytic flue gas desulfurization tower, wherein the desulfurization reactor has at least one air inlet, at least one exhaust port, at least one drain port, and a catalyst located in the desulfurization reactor, and the desulfurization reactor is provided with a spray device for a regeneration liquid for washing and regenerating the catalyst; during desulfurization, the flue gas enters the desulfurization reactor from the air inlet and then passes through the catalyst for desulfurization and is then discharged from the exhaust port. The sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid when passing through the catalyst. When the catalyst is washed and regenerated, the sulfuric acid enters the regeneration liquid sprayed on the catalyst and is discharged from the drain port.

[0004] At present, there are still some problems, defects or unreasonable aspects in the design of catalytic flue gas desulfurization towers and desulfurization reactors, and the perfection of the engineering application of catalytic flue gas desulfurization technology still has room for further improvement. These problems, defects or unreasonable aspects include: 1) When it is necessary to wash and regenerate the catalyst in the selected desulfurization reactor, the desulfurization reactor is often directly switched from the desulfurization state to the catalyst washing and regeneration state. When the flue gas temperature is high (for example, the flue gas temperature in the coking industry is often as high as 180°C), the catalyst temperature is also high. At this time, if the catalyst is washed and regenerated immediately, the catalyst is easily broken due to the large temperature difference before and after. 2) When the catalyst is washed and regenerated, the regeneration liquid needs to be discharged from the drain port of the desulfurization reactor, and after regeneration, the drain port needs to be blocked to prevent flue gas leakage. At present, a U-shaped liquid seal is designed for the regeneration liquid drainage structure. When the catalyst is washed and regenerated, the regeneration liquid is discharged through the U-shaped liquid seal, and after regeneration, the drain port is blocked through the U-shaped liquid seal. However, since the pressure at the outlet of the U-shaped liquid seal cannot be controlled as needed, the regeneration liquid is automatically stored in the U-shaped liquid seal after each catalyst washing and regeneration, which inconveniences the maintenance and inspection of the desulfurization reactor. 3) Based on the inventors' accumulated experience in equipment and facility maintenance for engineering applications of catalytic flue gas desulfurization technology, the stainless steel and other metal pipe walls near the gas-liquid separation surface at the input end of the liquid seal pipeline in the above-mentioned U-shaped liquid seal are prone to corrosion. Although this phenomenon and its cause have not been disclosed, it is likely to cause leakage of the regeneration liquid, posing a significant risk. Summary of the Invention

[0005] The embodiments of the present application provide a method for washing and regenerating the catalyst of a catalytic flue gas desulfurization device, which can solve the technical problem of catalyst breakage due to a large temperature difference between the front and rear surfaces by cooling the catalyst and then washing and regenerating it.

[0006] According to a first aspect of the present application, a method for washing and regenerating a catalyst of a catalytic flue gas desulfurization device is provided, wherein the catalytic flue gas desulfurization device includes a desulfurization reactor, the desulfurization reactor having at least one air inlet, at least one exhaust port, at least one drain port, and a catalyst located in the desulfurization reactor, wherein the desulfurization reactor is provided with a spray device for a regeneration liquid for washing and regenerating the catalyst; during desulfurization, the flue gas enters the desulfurization reactor from the air inlet, is desulfurized by the catalyst, and is then discharged from the exhaust port, the sulfur dioxide in the flue gas reacts on the catalyst when passing through the catalyst to form sulfuric acid, and when the catalyst is washed and regenerated, the sulfuric acid enters the regeneration liquid sprayed on the catalyst and is then discharged from the drain port; the method comprises: cutting off the air inlet of the flue gas, and then introducing catalyst cooling gas having a temperature lower than the flue gas temperature during desulfurization into the desulfurization reactor, allowing the catalyst cooling gas to pass through the catalyst and carry heat in the catalyst before being discharged from the exhaust port; and starting the spray device after the catalyst is cooled to a set condition, spraying the regeneration liquid onto the catalyst through the spray device to wash and regenerate the catalyst and allowing the regeneration liquid to be discharged from the drain port. The method of the first aspect mentioned above first cools the catalyst by using catalyst cooling gas whose temperature is lower than the flue gas temperature during desulfurization, and then washes and regenerates the catalyst, which can effectively solve the technical problem of catalyst breakage due to the large temperature difference before and after.

[0007] According to a second aspect of the present application, a method for washing and regenerating a catalyst in a catalytic flue gas desulfurization device is provided. The catalytic flue gas desulfurization device includes a desulfurization reactor, the desulfurization reactor has at least one air inlet, at least one exhaust port, at least one liquid discharge port, and a catalyst located in the desulfurization reactor. The desulfurization reactor is provided with a spray device for a regeneration liquid for washing and regenerating the catalyst. During desulfurization, the flue gas enters the desulfurization reactor from the air inlet, passes through the catalyst for desulfurization, and is then discharged from the exhaust port. The sulfur dioxide in the flue gas passes through the catalyst. When the catalyst reacts to form sulfuric acid, the sulfuric acid enters the regeneration liquid sprayed on the catalyst and is discharged from the drain port when the catalyst is washed and regenerated; it includes: spraying cooling liquid into the flue gas inlet passage to cool the flue gas, and then passing the cooled flue gas into the desulfurization reactor, so that the cooled flue gas passes through the catalyst and carries the heat in the catalyst before being discharged from the exhaust port; after the catalyst is cooled to the set conditions, the spraying device is started, and the regeneration liquid is sprayed on the catalyst through the spraying device to wash and regenerate the catalyst, and the regeneration liquid is discharged from the drain port. The method of the second aspect first cools the flue gas by spraying cooling liquid, and then washes and regenerates the catalyst, which effectively solves the technical problem of catalyst breakage due to the large temperature difference between the front and the back, and at the same time, compared with the method of the first aspect, it can save catalyst cooling gas and reduce operating costs.

[0008] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be learned through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings that constitute part of this specification are used to assist in understanding the present application. The contents provided in the drawings and the related descriptions in this specification can be used to explain the embodiments of the present application, but do not constitute improper limitations on the embodiments of the present application.

[0010] Figure 1 This is a structural diagram of a flue gas desulfurization device according to an embodiment of a prior application.

[0011] Figure 2 for Figure 1 The diagram shows a partial schematic diagram of the flue gas desulfurization device.

[0012] Figure 3 for Figure 1 The diagram shows a partial schematic diagram of the flue gas desulfurization device.

[0013] Figure 4 for Figure 1 The schematic diagram of the regeneration liquid circulation part of the flue gas desulfurization device is shown.

[0014] Figure 5 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower in an embodiment of the present application.

[0015] Figure 5 It can reflect the shape, layout and layout of the desulfurization reactor as well as the layout of the air intake and exhaust pipe networks.

[0016] Figure 6 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower according to an embodiment of the present application.

[0017] Figure 6 It can reflect the layout of the regeneration liquid circulation system.

[0018] Figure 7 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower according to an embodiment of the present application.

[0019] Figure 7 It can reflect the layout of the grid-type support beams under the bottom plate of the desulfurization reactor and the columns inside the desulfurization reactor.

[0020] Figure 8 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower according to an embodiment of the present application.

[0021] Figure 8 for Figure 7 Middle BB view.

[0022] Figure 9 for Figure 7 Center AA view.

[0023] Figure 10 for Figure 7 The diagram shows the elevation structure of the desulfurization reactor in the catalytic flue gas desulfurization tower.

[0024] Figure 11 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower according to an embodiment of the present application.

[0025] Figure 11 It can reflect the placement of catalyst partitions inside the desulfurization reactor.

[0026] Figure 12 This is a schematic diagram of the catalyst separator structure in a catalytic flue gas desulfurization device according to an embodiment of the present application.

[0027] Figure 13 for Figure 12 Center AA view.

[0028] Figure 14 This is a schematic diagram of the installation structure of the columns and main beams in a catalytic flue gas desulfurization device according to an embodiment of the present application.

[0029] Figure 15 This is a schematic diagram of the installation structure of the columns and main beams in a catalytic flue gas desulfurization device according to an embodiment of the present application.

[0030] Figure 16 This is a schematic diagram of the secondary beam installation structure in a catalytic flue gas desulfurization device according to an embodiment of the present application.

[0031] Figure 17 for Figure 16 A local enlarged view of point I in FIG.

[0032] Figure 18 For Figure 16 A structural diagram of a foundation in which acid-resistant bricks are laid on the main beam at intervals along the length direction of the main beam.

[0033] Figure 19 This is a schematic diagram of the catalyst separator positioning groove structure in a catalytic flue gas desulfurization device according to an embodiment of the present application.

[0034] Figure 20 This is a photo of the overall structure of a catalytic flue gas desulfurization tower in an embodiment of the present application.

[0035] Figure 20 It can reflect the rear appearance of a catalytic flue gas desulfurization tower (i.e., a "square tower") in an embodiment of the present application.

[0036] Figure 21This is a photo of the maintenance process of a catalytic flue gas desulfurization tower in an embodiment of the present application.

[0037] Figure 22 This is a schematic diagram of a regeneration liquid discharge structure of a catalytic flue gas desulfurization device in an embodiment of the present application.

[0038] Figure 23 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower in an embodiment of the present application.

[0039] Figure 23 It can reflect the regeneration liquid discharge structure and cooling liquid spraying device of the catalytic flue gas desulfurization device.

[0040] Figure 24 This is a schematic flow chart of a catalyst washing and regeneration method for a catalytic flue gas desulfurization device according to an embodiment of the present application.

[0041] Figure 25 This is a schematic flow chart of a catalyst washing and regeneration method for a catalytic flue gas desulfurization device according to an embodiment of the present application. DETAILED DESCRIPTION

[0042] The following is a clear and complete description of the present application in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the present application based on these descriptions. Before describing the present application in conjunction with the accompanying drawings, it should be noted that:

[0043] The technical solutions and technical features provided in each section, including the following description, may be combined with each other unless they conflict. In addition, where possible, these technical solutions, technical features, and related combinations may be assigned specific technical themes and protected by relevant patents.

[0044] The embodiments of the present application involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making any creative work should fall within the scope of patent protection.

[0045] Regarding the terms and units in this specification: The terms "include", "comprising", "having" and any variations thereof in this specification and the corresponding claims and the related parts are intended to cover non-exclusive inclusions. The terms "front", "back", "left" and "right" in this specification and the corresponding claims and the related parts are intended to represent the front, rear, left and right sides of the device based on the drawings ( Figure 5 、 6 The relative positional relationships of the "front", "back", "left" and "right" directions are indicated in Figures 7 and 11. In addition, other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0046] Contents of the prior application

[0047] Figure 1 This is a schematic structural diagram of a flue gas desulfurization device according to an embodiment of a prior application. Figure 2 for Figure 1 The diagram shows a partial schematic diagram of the flue gas desulfurization device. Figure 3 for Figure 1 The diagram shows a partial schematic diagram of the flue gas desulfurization device. Figure 4 for Figure 1 The schematic diagram of the regeneration liquid circulation part of the flue gas desulfurization device is shown.

[0048] like Figure 1-4 As shown, a flue gas desulfurization device according to an embodiment of the prior application includes a flue gas desulfurization unit 10 and a regeneration liquid circulation unit 12. The flue gas desulfurization unit 10 includes at least one desulfurization reactor 11, the desulfurization reactor 11 having at least one air inlet 111, at least one exhaust port 112, at least one liquid discharge port 113, a catalyst 114 located in the desulfurization reactor 11, and a regeneration liquid spraying device (not shown in the figure) for washing and regenerating the catalyst 114. During desulfurization, flue gas enters the desulfurization reactor 11 from the air inlet 111, is desulfurized by the catalyst 114, and is then discharged from the exhaust port 112. When passing through the catalyst 114, sulfur dioxide in the flue gas reacts on the catalyst 114 to form sulfuric acid. When washing and regenerating the catalyst 114, the sulfuric acid enters the regeneration liquid sprayed on the catalyst 114 and is finally discharged from the liquid discharge port 113.

[0049] The regeneration liquid circulation section 12 includes a plurality of regeneration liquid tanks 121 and a regeneration liquid circulation control pipeline network connected between the plurality of regeneration liquid tanks 121 and the desulfurization reactor 11. The regeneration liquid circulation control pipeline network has an output side control pipeline network 122, an input side control pipeline network 123 and a regeneration liquid driving device 124. The output side control pipeline network 122 can introduce the regeneration liquid in any one of the plurality of regeneration liquid tanks 121 into the regeneration liquid spraying device of the desulfurization reactor 11. The input side control pipeline network 123 can introduce the regeneration liquid output from the discharge port 113 of the desulfurization reactor 11 into any one of the regeneration liquid tanks 121. The regeneration liquid driving device 124 can provide the required power to the regeneration liquid.

[0050] Specifically, the output-side control pipe network 122 includes an output-side main pipe 1221 connected to the spray device of the desulfurization reactor 11, and output-side first branches 1222 each connected between the output-side main pipe 1221 and a corresponding regeneration liquid tank 121. Each output-side first branch 1222 is provided with an output-side first control valve 1223. The regeneration liquid drive device 124 is connected in series to the output-side main pipe 1221. The input-side control pipe network 123 includes an input-side main pipe 1231 connected to the discharge port 113 of the desulfurization reactor 11, and input-side first branches 1232 each connected between the input-side main pipe 1231 and a corresponding regeneration liquid tank 121. Each input-side first branch 1232 is provided with an input-side first control valve 1233.

[0051] In addition, a return pipe 1224 is connected between the pipeline on the output side of the regeneration liquid driving device 124 on the output side main pipe 1221 and the input side main pipe 1231 , and a return pipe control valve 1225 is provided on the return pipe 1224 .

[0052] A typical use of the flue gas desulfurization device is to store dilute sulfuric acid of different concentrations in the multiple regeneration liquid tanks 121 as regeneration liquid. When the catalyst 114 in the desulfurization reactor 11 needs to be washed and regenerated, first, the output side first control valve 1223 and the input side first control valve 1233 corresponding to the regeneration liquid tank 121 storing the highest concentration of dilute sulfuric acid among the multiple regeneration liquid tanks 121 are opened, and then the dilute sulfuric acid in the regeneration liquid tank 121 storing the highest concentration of dilute sulfuric acid is sent to the regeneration liquid tank 121 through the corresponding output side first branch 1222, the regeneration liquid driving device 124 (usually a pump) and the output side main pipe 1221. The regeneration liquid spraying device of the desulfurization reactor 11 is used to regenerate the catalyst. The regeneration liquid is then returned to the original regeneration liquid tank 121 from the input side main pipe 1231 and the corresponding input side first branch 1232. After washing and regenerating the catalyst for a period of time using the dilute sulfuric acid with the highest concentration, the output side first control valve 1223 and the input side first control valve 1233 corresponding to the regeneration liquid tank 121 storing the dilute sulfuric acid with a lower concentration among the multiple regeneration liquid tanks 121 are opened, and the catalyst is washed and regenerated again using the same method. Repeating the above operation, the catalyst can also be washed and regenerated using dilute sulfuric acid with a lower concentration or clean water. In this way, the sulfuric acid on the active sites of the catalyst can be more fully eluted, improving the regeneration effect of the catalyst.

[0053] Since the sulfate ion concentration of the regeneration liquid stored in each regeneration liquid tank 121 changes dynamically with catalyst regeneration, in order to facilitate the adjustment of the sulfate ion concentration of the regeneration liquid stored in each regeneration liquid tank 121, the return pipe control valve 1225 can be opened when necessary. At the same time, the required output side first control valve 1223 and input side first control valve 1233 are opened, and the regeneration liquid driving device 124 is started. In this way, the regeneration liquid in any regeneration liquid tank 121 can be transferred to any other regeneration liquid tank 121, thereby adjusting the sulfate ion concentration of the corresponding regeneration liquid by mixing the regeneration liquids with different sulfate ion concentrations. This also has the advantages of more accurately controlling the sulfate ion concentration of the regeneration liquid used in each regeneration and facilitating the configuration of dilute sulfuric acid in different regeneration liquid tanks 121.

[0054] In a common implementation, Figure 1-2 As shown, the flue gas desulfurization section 10 includes at least two desulfurization reactors 11; to this end, the output side control pipe network 122 includes output side second branches 1226 respectively connected between the output side main pipe 1221 and the spray device corresponding to a desulfurization reactor 11, and the input side control pipe network 123 includes input side second branches 1234 respectively connected between the input side main pipe 1231 and the drain port 113 corresponding to a desulfurization reactor 11.

[0055] In an optional embodiment, Figure 1-2 As shown, the flue gas desulfurization section 10 includes at least one group of desulfurization reactor columns, and the desulfurization reactor columns include at least two desulfurization reactors 11 that are vertically arranged and respectively installed on support platforms of different floors 131 of the frame support structure 13. Designing the flue gas desulfurization section 10 to include at least one group of desulfurization reactor columns, and the desulfurization reactor columns include at least two desulfurization reactors 11 that are vertically arranged and respectively installed on support platforms of different floors 131 of the frame support structure 13, can minimize the size of a single desulfurization reactor and greatly reduce the manufacturing difficulty and cost of a single desulfurization reactor; in addition, the floor-based installation of a single desulfurization reactor is achieved through the frame support structure 13, which not only ensures a smaller footprint of the flue gas desulfurization section 10, but also facilitates the maintenance of each desulfurization reactor 11.

[0056] On this basis, the flue gas desulfurization section 10 may also include an air intake network 14 and an exhaust network 15; the air intake network 14 includes an air intake main pipe 141 vertically arranged beside the vertical row of desulfurization reactors and each air intake branch pipe 142 that connects the air intake main pipe 141 to the air inlet 111 of a corresponding desulfurization reactor 11 in the vertical row of desulfurization reactors; the exhaust network 15 includes an exhaust main pipe 151 vertically arranged beside the vertical row of desulfurization reactors and each exhaust branch pipe 152 that connects the exhaust main pipe 151 to the exhaust port 112 of a corresponding desulfurization reactor 11 in the vertical row of desulfurization reactors.

[0057] The intake branch pipe 142 has a curved structure that extends downward, then bends back and extends upward. The end of the intake branch pipe 142 connected to the intake manifold 141 is higher than the end of the intake branch pipe 142 connected to the air inlet 111 of the corresponding desulfurization reactor 11. A drainage structure is provided on the curved structure. This design of the intake branch pipe prevents the regeneration liquid from flowing back into the intake manifold 141.

[0058] Optionally, the output-side control pipe network 122 and the input-side control pipe network 123 are generally distributed on opposite sides of the frame-type support structure 13. Preferably, when the flue gas desulfurization unit 10 includes at least two vertical rows of desulfurization reactors, if the at least two vertical rows of desulfurization reactors are arranged in a left-right direction, the output-side control pipe network 122 and the input-side control pipe network 123 are generally distributed on the front and back sides of the frame-type support structure 13. Simultaneously, the intake pipe network 14 and the exhaust pipe network 15 may also be generally distributed on the front and back sides of the frame-type support structure.

[0059] In one embodiment, Figure 1 、 3 As shown, the multiple regeneration liquid tanks 121 are horizontally arranged in parallel at the bottom of the frame support structure 13; the output side main pipe 1221 includes a horizontal section of the output side main pipe horizontally arranged along the parallel direction of the multiple regeneration liquid tanks 121 and a vertical section of the output side main pipe connected to the horizontal section of the output side main pipe through the regeneration liquid driving device, and the first output side branches 1222 are arranged at intervals on the horizontal section of the output side main pipe, and the second output side branches 1226 are arranged at intervals on the vertical section of the output side main pipe; the input side main pipe 1231 includes a horizontal section of the input side main pipe horizontally arranged along the parallel direction of the multiple regeneration liquid tanks and a vertical section of the input side main pipe connected to the horizontal section of the input side main pipe, and the first input side branches 1232 are arranged at intervals on the horizontal section of the input side main pipe, and the second input side branches are arranged at intervals on the vertical section of the input side main pipe.

[0060] In one embodiment, at least one of the multiple regeneration liquid tanks 121 is connected to a product recovery tank via a regeneration liquid transmission pipeline having a membrane filtration pump 125 and a membrane filter 126 connected in series, so as to recycle the regeneration liquid.

[0061] Further explanation of the prior application

[0062] From the above, it can be seen that the prior application actually provides a catalytic flue gas desulfurization tower, which can be specifically described and / or summarized as including the following points:

[0063] 1) The catalytic flue gas desulfurization tower desulfurizes flue gas through a desulfurization reactor 11, which has at least one air inlet 111, at least one exhaust port 112, at least one drain port 113, and a catalyst 114 located in the desulfurization reactor. The desulfurization reactor 11 is provided with a spraying device for a regeneration liquid for washing and regenerating the catalyst 114. During desulfurization, the flue gas enters the desulfurization reactor 11 from the air inlet 111, is desulfurized by the catalyst 114, and is then discharged from the exhaust port 112. When passing through the catalyst 114, the sulfur dioxide in the flue gas reacts on the catalyst 114 to form sulfuric acid. When washing and regenerating the catalyst 114, the sulfuric acid enters the regeneration liquid sprayed on the catalyst 114 and is discharged from the drain port.

[0064] 2) The catalytic flue gas desulfurization tower includes a left-side desulfurization reactor column, a right-side desulfurization reactor column, an air intake network, an exhaust network, and a regeneration liquid circulation system. The left-side desulfurization reactor column includes at least two desulfurization reactors 11 vertically arranged on the left support platform on different floors of the frame support structure 13; the right-side desulfurization reactor column includes at least two desulfurization reactors 11 vertically arranged on the right support platform on different floors of the frame support structure 13; the air intake network 14 includes an air intake main pipe 141 (see FIG. 1 ) vertically arranged in front of the frame support structure 13 and located between the left-side desulfurization reactor column and the right-side desulfurization reactor column. Figure 1-2 ) and the intake manifold 141 is connected to the air inlet 111 of each desulfurization reactor and is located at the front side of the corresponding desulfurization reactor 11; the exhaust pipe network 15 includes an exhaust manifold 151 (see FIG. 1 ) which can be vertically arranged at the rear side of the frame support structure 13 and is located between the left desulfurization reactor vertical row and the right desulfurization reactor vertical row. Figure 1-2) and the exhaust main pipe 151 is respectively connected to the exhaust port 112 of each desulfurization reactor and each exhaust branch pipe 152 is located above the corresponding desulfurization reactor 11; the regeneration liquid circulation system includes a plurality of regeneration liquid tanks 121 and a regeneration liquid circulation control pipe network connected between the plurality of regeneration liquid tanks 121 and each desulfurization reactor 11, the regeneration liquid circulation control pipe network has an output side control pipe network 122, an input side control pipe network 123 and a regeneration liquid driving device 124, the output side control pipe network 122 can introduce the regeneration liquid in the selected regeneration liquid tank 121 into the regeneration liquid spraying device of the selected desulfurization reactor 11, the input side control pipe network 123 can introduce the regeneration liquid output from the discharge port 113 of the selected desulfurization reactor 11 into the selected regeneration liquid tank 121, and the regeneration liquid driving device 124 can provide the required power to the regeneration liquid.

[0065] 3) The left and right desulfurization reactor rows are spaced apart in the left and right width directions of the frame support structure 13, thereby forming a pipeline equipment installation area in the middle of the frame support structure 13, and the exhaust manifold 151 is placed in the pipeline equipment installation area (see Figure 1-2 ).

[0066] Obviously, since the left and right desulfurization reactors are spaced apart in the left and right width directions of the frame support structure 13, a pipeline equipment installation area is formed in the middle of the frame support structure 13. The exhaust main pipe 151 is placed in the pipeline equipment installation area, which can reduce the space occupied in the front and rear directions of the catalytic flue gas desulfurization tower. In addition, it helps to shorten the length of each exhaust branch pipe 152, which helps to save costs. Figure 1-2 It can be seen from the figure that the exhaust port 112 on the desulfurization reactor 11 is close to the rear side of the desulfurization reactor 11 and away from the top center of the desulfurization reactor 11.

[0067] In addition, the prior application mentioned that "the intake branch pipe 142 has a curved structure that extends downward, then turns back and extends upward", and Figure 1-2 The specific situation of the curved structure of the intake branch pipe 142 can be seen more intuitively. Figure 1-2It can also be found that the second branch 1234 on the input side also adopts a similar curved structure. It should be pointed out that the purpose of adopting the curved structure on the intake branch pipe 142 and the second branch 1234 on the input side is that when liquid is injected into the curved structure, the curved structure can form a liquid seal (i.e., the U-shaped liquid seal mentioned in the background technology). Therefore, when the curved structure of the intake branch pipe 142 forms a liquid seal, the corresponding desulfurization reactor 11 no longer receives flue gas, and the catalyst 114 in the desulfurization reactor 11 can be washed and regenerated. When the curved structure on the second branch 1234 on the input side forms a liquid seal, the flue gas in the corresponding desulfurization reactor 11 will not leak from the second branch 1234 on the input side, so as to maintain the desulfurization operation of the desulfurization reactor 11.

[0068] The catalytic flue gas desulfurization tower provided in the prior application has been put into practical use in engineering (but this does not mean that the catalytic flue gas desulfurization tower has been publicly used). The applicant has found through practice that the catalytic flue gas desulfurization tower provided in the prior application still has the following problems, defects or unreasonable aspects.

[0069] First, the desulfurization reactor 11 in the catalytic flue gas desulfurization tower provided in the prior application still adopts a traditional cylindrical reactor (since the applicant of the prior application and the applicant of this application are the same applicant, the applicant determines that the actual implementation plan corresponding to the prior application adopts a cylindrical reactor). The cylindrical reactor will cause at least the following problems.

[0070] First, the catalytic flue gas desulfurization tower includes a frame support structure, a left-side desulfurization reactor column, a right-side desulfurization reactor column, an air intake and exhaust pipe network, and a regeneration liquid circulation system. The layout of these two columns, the air intake and exhaust pipe network, and the frame support structure results in a significant amount of wasted space around the cylindrical reactor. Therefore, when the flue gas flow rate is high, the diameter of the cylindrical reactor is increased accordingly.

[0071] Secondly, the cylindrical reactors adjacent to each other on the same layer of the catalytic flue gas desulfurization tower are independent of each other, and each cylindrical reactor needs to be manufactured separately, which is not conducive to saving materials in the manufacturing of the desulfurization reactor.

[0072] Thirdly, since the amount of catalyst loaded in a desulfurization reactor is large, if all the catalysts in the same desulfurization reactor are to be washed and regenerated at the same time, the flow rate of the required regeneration liquid is large, and the cost of the corresponding pipeline facilities is high. Therefore, it is possible to consider setting a catalyst partition in the desulfurization reactor. The catalyst partition is used to separate different catalyst placement cavities. The spray device can be configured accordingly to have a spray unit that can independently spray the regeneration liquid on the catalysts in the different catalyst placement cavities. In this way, the catalysts in the different catalyst placement cavities can be washed and regenerated in turn to reduce the construction and use costs of the pipeline facilities. However, when the desulfurization reactor is a cylindrical reactor, it is not easy to comprehensively design and layout the number and position of the catalyst partitions, the number and position of the spray points in the spray unit, and the number and position of the related openings on the desulfurization reactor (including the exhaust port and the first openable and closable operating port and the second openable and closable operating port to be introduced below).

[0073] Second, the frame support structure of the catalytic flue gas desulfurization tower provided in the prior application is a common steel structure, while the cylindrical reactor is made of fiberglass or stainless steel. Therefore, the frame support structure and the cylindrical reactor need to be constructed separately and then assembled later, resulting in a high overall construction cost.

[0074] In addition, the frame support structure can only support the cylindrical reactor and cannot strengthen the bottom plate of the cylindrical reactor itself. The bottom plate of the desulfurization reactor has to withstand the pressure of the internal components of the desulfurization reactor. Therefore, the thickness of the bottom plate of the desulfurization reactor is relatively thick, which further increases the manufacturing and installation costs.

[0075] Third, as mentioned above, since the amount of catalyst loaded in a desulfurization reactor is large, if all the catalysts in the same desulfurization reactor are to be washed and regenerated at the same time, the flow rate of the required regeneration liquid is large, and the cost of the corresponding pipeline facilities is high. Therefore, it is possible to consider setting up a catalyst partition in the desulfurization reactor. The catalyst partition is used to separate different catalyst placement cavities. The spray device can be configured accordingly to have a spray unit that can independently spray the regeneration liquid on the catalysts in the different catalyst placement cavities. In this way, the catalysts in the different catalyst placement cavities can be washed and regenerated in turn to reduce the construction and use costs of the pipeline facilities. In current actual engineering applications, since the internal components of the desulfurization reactor are constructed after the desulfurization reactor shell is completed and fixed to the frame support structure (only the desulfurization reactor shell can be customized on the market, and the internal components of the desulfurization reactor can only be built by themselves), the specific structure of the catalyst partition and how to install and fix the catalyst partition inside the desulfurization reactor become problems.

[0076] Fourth, in current practical engineering applications, the interior of the desulfurization reactor is divided from bottom to top into a flue gas distribution layer, a catalyst placement layer, and a flue gas overflow layer. The flue gas distribution layer is provided with a gas distribution support structure, and the catalyst is placed in the catalyst placement layer above the gas distribution support structure. During desulfurization, the flue gas enters the flue gas distribution layer from the air inlet, then passes through the gas distribution support structure in a dispersed manner from bottom to top, passes through the catalyst, enters the flue gas overflow layer, and is discharged from the exhaust port. The gas distribution support structure generally includes columns arranged in a planar array on the bottom plate of the desulfurization reactor and a catalyst permeable support structure supported above the columns. Since the internal components of the desulfurization reactor are constructed after the desulfurization reactor shell is completed and fixed to the frame support structure, the columns and catalyst permeable support structure also need to be installed after the desulfurization reactor shell is completed and fixed to the frame support structure. Therefore, the specific structure of the catalyst permeable support structure to be used and how to install the catalyst permeable support structure inside the desulfurization reactor become problems.

[0077] Fifth, as mentioned above, in current practical engineering applications, the interior of the desulfurization reactor is divided from bottom to top into a flue gas distribution layer, a catalyst placement layer, and a flue gas overflow layer. The flue gas distribution layer is provided with a gas distribution support structure, and the catalyst is placed in the catalyst placement layer above the gas distribution support structure. During desulfurization, the flue gas enters the flue gas distribution layer from the air inlet and then passes through the gas distribution support structure in a dispersed manner from bottom to top, passes through the catalyst, enters the flue gas overflow layer, and is discharged from the exhaust port. In addition, in order to facilitate the loading and unloading of the catalyst and the maintenance of the flue gas distribution layer, the desulfurization reactor may also have at least one first openable and closable operating port, at least one second openable and closable operating port, and at least one third openable and closable operating port. The first openable and closable operating port can be used to load the catalyst into the desulfurization reactor, the second openable and closable operating port can be used to unload the catalyst from the desulfurization reactor, and the third openable and closable operating port can be used to operate the gas distribution support structure. Thus, the air inlet of the desulfurization reactor can be arranged on the side of the flue gas distribution layer, the exhaust port and the first openable and closable operating port of the desulfurization reactor can be arranged on the top surface of the flue gas overflow layer, the second openable and closable operating port of the desulfurization reactor can be arranged on the side of the catalyst placement layer and close to the bottom of the catalyst placement layer, the third openable and closable operating port of the desulfurization reactor can be arranged on the side or bottom surface of the flue gas distribution layer, and the liquid discharge port of the desulfurization reactor can be arranged on the bottom surface of the flue gas distribution layer. It can be seen that the desulfurization reactor has at least one air inlet, at least one exhaust port, at least one liquid discharge port, at least one first openable and closable operating port, at least one second openable and closable operating port, and at least one third openable and closable operating port. These openings need to be distributed accordingly in the flue gas distribution layer, the catalyst placement layer, and the flue gas overflow layer. At present, the arrangement orientation of these openings is not entirely reasonable.

[0078] Sixth, when it is necessary to wash and regenerate the catalyst in the selected desulfurization reactor, the desulfurization reactor is often directly switched from the desulfurization state to the catalyst washing and regeneration state. When the flue gas temperature is high (for example, the flue gas temperature in the coking industry is often as high as 180°C), the catalyst temperature is also high. At this time, if the catalyst is washed and regenerated immediately, the catalyst is easily broken due to the large temperature difference before and after.

[0079] Seventh, when the catalyst is washed and regenerated, the regeneration liquid needs to be discharged from the drain port of the desulfurization reactor, and after regeneration, the drain port needs to be blocked to prevent smoke leakage. At present, a U-shaped liquid seal is designed for the regeneration liquid discharge structure. When the catalyst is washed and regenerated, the regeneration liquid is discharged through the U-shaped liquid seal, and after regeneration, the drain port is blocked through the U-shaped liquid seal. However, since it is currently impossible to control the pressure at the outlet end of the U-shaped liquid seal as needed (the upper end of the input side main pipe 1231 is bent downward and directly connected to the atmospheric environment), the regeneration liquid will be automatically stored in the U-shaped liquid seal after each washing and regeneration of the catalyst, which brings inconvenience to the maintenance and inspection of the desulfurization reactor.

[0080] Eighth, according to the inventor's experience in equipment and facility maintenance for engineering application projects of catalytic flue gas desulfurization technology, the stainless steel and other metal pipe walls in the gas-liquid separation area near the input end of the liquid seal pipeline in the above-mentioned U-shaped liquid seal are prone to corrosion. Although this phenomenon and its causes have not been disclosed, it is very likely to cause leakage of the regeneration liquid, causing considerable risks and hidden dangers.

[0081] To address one or more of the above-mentioned problems, defects, or inconsistencies, this application provides the following solutions. The following describes the relevant solutions with reference to the accompanying drawings. These solutions may be combined with one another where they do not conflict; the features within these solutions may also be combined with one another.

[0082] Figure 5 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower in an embodiment of the present application. Figure 5 It can reflect the shape, layout and layout of the desulfurization reactor as well as the layout of the air intake and exhaust pipe networks. Figure 6 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower according to an embodiment of the present application. Figure 6 It can reflect the layout of the regeneration liquid circulation system. Figure 7 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower according to an embodiment of the present application. Figure 7 It can reflect the layout of the grid-type support beams under the bottom plate of the desulfurization reactor and the columns inside the desulfurization reactor. Figure 8 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower according to an embodiment of the present application. Figure 8 for Figure 7 Middle BB view. Figure 9 for Figure 7 Center AA view. Figure 10 for Figure 7 The diagram shows the elevation structure of the desulfurization reactor in the catalytic flue gas desulfurization tower. Figure 11 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower according to an embodiment of the present application. Figure 11 It can reflect the placement of catalyst partitions inside the desulfurization reactor. Figure 12 This is a schematic diagram of the catalyst separator structure in a catalytic flue gas desulfurization device according to an embodiment of the present application. Figure 13 for Figure 12 Center AA view. Figure 20 This is a photo of the overall structure of a catalytic flue gas desulfurization tower in an embodiment of the present application. Figure 20 It can reflect the rear appearance of a catalytic flue gas desulfurization tower (i.e., a "square tower") in an embodiment of the present application.

[0083] like Figure 5-13 as well as Figure 20 As shown, a catalytic flue gas desulfurization tower according to an embodiment of the present application desulfurizes flue gas through a desulfurization reactor 11, wherein the desulfurization reactor 11 has at least one air inlet 111, at least one exhaust port 112, at least one drain port 113, and a catalyst 114 located in the desulfurization reactor. The desulfurization reactor 11 is provided with a spraying device for a regeneration liquid for washing and regenerating the catalyst 114; during desulfurization, the flue gas enters the desulfurization reactor 11 from the air inlet 111 and is then desulfurized by the catalyst 114 and then discharged from the exhaust port 112; the sulfur dioxide in the flue gas reacts on the catalyst 114 when passing through the catalyst 114 to form sulfuric acid; when the catalyst 114 is washed and regenerated, the sulfuric acid enters the regeneration liquid sprayed on the catalyst 114 and is discharged from the drain port 113.

[0084] In addition, the catalytic flue gas desulfurization tower also includes: a left-side desulfurization reactor vertical row 11A, the left-side desulfurization reactor vertical row 11A includes at least two desulfurization reactors 11 installed in a vertical arrangement on the left support platforms on different floors of the frame support structure 13; a right-side desulfurization reactor vertical row 11B, the right-side desulfurization reactor vertical row 11B includes at least two desulfurization reactors 11 installed in a vertical arrangement on the right support platforms on different floors of the frame support structure 13; an air intake pipe network 14, the air intake pipe network 14 includes an air intake main pipe 141 vertically arranged on the front side of the frame support structure 13 and located between the left-side desulfurization reactor vertical row 11A and the right-side desulfurization reactor vertical row 11B, and air intake branches 142 that connect the air intake main pipe 141 to the air inlet 111 of each desulfurization reactor 11 and are located on the front side of the corresponding desulfurization reactor 111; an exhaust pipe network 15, the exhaust pipe network 15 includes a vertically arranged air intake main pipe 141 on the front side of the frame support structure An exhaust main pipe 151 is located at the rear side of the structure 13 and between the left desulfurization reactor vertical row 11A and the right desulfurization reactor vertical row 11B, and each exhaust branch pipe 152 connects the exhaust main pipe 151 to the exhaust port 112 of each desulfurization reactor 11 respectively and is located above the corresponding desulfurization reactor 11; and a regeneration liquid circulation system, the regeneration liquid circulation system includes at least one regeneration liquid tank 121 and a regeneration liquid circulation control pipe network connected between the at least one regeneration liquid tank 121 and each desulfurization reactor 11, the regeneration liquid circulation control pipe network has an output side control pipe network 122, an input side control pipe network 123 and a regeneration liquid driving device 124, the output side control pipe network 122 can introduce the regeneration liquid in the selected regeneration liquid tank 121 into the regeneration liquid spraying device of the selected desulfurization reactor 11, the input side control pipe network 123 can introduce the regeneration liquid output from the discharge port of the selected desulfurization reactor 11 into the selected regeneration liquid tank 121, and the regeneration liquid driving device 124 can provide the required power to the regeneration liquid.

[0085] In addition, the key point is that in the catalytic flue gas desulfurization tower: the outline of the desulfurization reactor 11 constitutes a first rectangular body, the overall outline of the left desulfurization reactor column 11A and the overall outline of the right desulfurization reactor column 11B respectively constitute a second rectangular body, and the overall outline of the desulfurization tower body composed of the left desulfurization reactor column 11A, the right desulfurization reactor column 11B and the frame support structure 13 constitutes a third rectangular body. For the convenience of description, this catalytic flue gas desulfurization tower can be called a "square tower". Figure 20 The external structure of this square tower can be seen more intuitively.

[0086] pass Figure 5 and Figure 20It can be seen that since the outline of the desulfurization reactor 11 constitutes a first rectangular body, the overall outline of the left desulfurization reactor column 11A and the overall outline of the right desulfurization reactor column 11B respectively constitute a second rectangular body, and the overall outline of the desulfurization tower body composed of the left desulfurization reactor column 11A, the right desulfurization reactor column 11B and the frame-type support structure 13 constitutes a third rectangular body. In this way, the entire desulfurization tower body is not only more beautiful, but also more fully allocates the space occupied by the catalytic flue gas desulfurization tower as a whole to the desulfurization reactor 11, reducing the waste of space around the desulfurization reactor 11. Compared with the catalytic flue gas desulfurization tower using a cylindrical reactor, under the condition of the same overall footprint, the horizontal projection area of ​​the desulfurization reactor 11 of the square tower is larger, so the desulfurization reactor 11 of the square tower can accommodate more catalysts.

[0087] The above-mentioned catalytic flue gas desulfurization tower (square tower) can be further designed as follows: the interior of the desulfurization reactor 11 is divided into a flue gas distribution layer 115, a catalyst placement layer 116 and a flue gas overflow layer 117 from bottom to top, and an air distribution support structure 118 is provided in the flue gas distribution layer 115. The catalyst is placed 114 in the catalyst placement layer 116 above the air distribution support structure 118. During desulfurization, the flue gas enters the flue gas distribution layer 115 from the air inlet 111 and then passes through the air distribution support structure 118 in a dispersed manner from bottom to top through the catalyst 114 into the flue gas overflow layer 117 and is discharged from the exhaust port 112.

[0088] On this basis, to facilitate operation, the desulfurization reactor 11 may further have at least one first openable and closable operating port 119A, at least one second openable and closable operating port 119B, and at least one third openable and closable operating port 119C. The first openable and closable operating port 119A can be used to load the catalyst 114 into the desulfurization reactor 11, the second openable and closable operating port 119B can be used to unload the catalyst 114 from the desulfurization reactor 11, and the third openable and closable operating port 119C can be used to operate the gas distribution support structure 118. These openable and closable operating ports are commonly referred to as "manholes."

[0089] On this basis, the air inlet 111 of the desulfurization reactor 11 can be arranged on the front side surface corresponding to the flue gas distribution layer 115, the exhaust port 112 and the first openable and closable operating port 119A of the desulfurization reactor 11 can be arranged on the top surface corresponding to the flue gas overflow layer 117, the second openable and closable operating port 119B of the desulfurization reactor 11 can be arranged on the side surface corresponding to the catalyst placement layer 116 belonging to the outer side of the third rectangular body, the third openable and closable operating port 119C of the desulfurization reactor 11 can be arranged on the side or bottom surface corresponding to the flue gas distribution layer 115, and the drain port 113 of the desulfurization reactor 11 can be arranged on the bottom surface corresponding to the flue gas distribution layer 115.

[0090] Since the amount of catalyst loaded in a desulfurization reactor 11 is large, if all the catalysts in the same desulfurization reactor 11 are to be washed and regenerated at the same time, the flow rate of the required regeneration liquid is large, and the cost of the corresponding pipeline facilities is high. Therefore, a catalyst separator 16 can be set in the desulfurization reactor 11 (specifically, the catalyst separator 16 is placed above the air distribution support structure 118 inside the desulfurization reactor 11). The catalyst separator 16 is used to separate the catalyst placement layer 116 into different catalyst placement cavities (for example, Figure 11 The left rectangular catalyst placement cavity 16A and the right rectangular catalyst placement cavity 16B in the figure are respectively provided, the spraying device can be correspondingly configured to have a spraying unit that can independently spray the regeneration liquid on the catalysts in the different catalyst placement cavities. In this way, the catalysts in the different catalyst placement cavities can be washed and regenerated in turn to reduce the construction and use costs of the pipeline facilities.

[0091] When the desulfurization reactor 11 is configured as a first rectangular body (i.e., the desulfurization reactor 11 is a rectangular reactor), the catalyst placement layer 116 can be divided into a first rectangular catalyst placement cavity and a second rectangular catalyst placement cavity (e.g., Figure 11 The left rectangular catalyst placement cavity 16A and the right rectangular catalyst placement cavity 16B in the desulfurization reactor 11 are respectively provided. At this time, the spraying device includes a first spraying unit that can independently spray the regeneration liquid on the catalyst in the first rectangular catalyst placement cavity and a second spraying unit that can independently spray the regeneration liquid on the catalyst in the second rectangular catalyst placement cavity; accordingly, the desulfurization reactor 11 may have a first openable and closable operating port 119A and a second openable and closable operating port 119B that correspond one to one with the first rectangular catalyst placement cavity and the second rectangular catalyst placement cavity of the desulfurization reactor 11, so as to load and unload the catalyst in the first rectangular catalyst placement cavity and the second rectangular catalyst placement cavity respectively.

[0092] Obviously, since the desulfurization reactor 11 adopts a rectangular reactor, after the catalyst placement layer 116 is separated into a first rectangular catalyst placement cavity and a second rectangular catalyst placement cavity by the catalyst partition 16, the first rectangular catalyst placement cavity and the second rectangular catalyst placement cavity are both rectangular structures, and the rectangular structure has multiple cylinders in different directions. In this way, it becomes easier to arrange openings such as the first openable and closable operating port 119A and the second openable and closable operating port 119B, and it is easy to achieve a more reasonable opening layout orientation design.

[0093] Typically, the first rectangular catalyst placement cavity and the second rectangular catalyst placement cavity are each a rectangular cavity with a length greater than a width. In this case, it is recommended that the first openable and closable operation port 119A be positioned close to the side surface (e.g., the side surface) of the third rectangular body that is the end surface of the corresponding rectangular cavity in the length direction. Figure 1 The first openable and closable operating port 119A is located near the rear side of the desulfurization reactor 11). The advantage of this is that when the catalyst is poured into the corresponding rectangular cavity through the first openable and closable operating port 119A, the catalyst is more likely to flow in the length direction of the corresponding rectangular cavity, thereby reducing the impact force of the catalyst on the catalyst partition 16, which helps to prevent the catalyst partition 16 from collapsing or being damaged. It should be noted that the position of the first openable and closable operating port 119A is arranged close to the side surface that belongs to the outside of the third rectangular body and serves as the end face in the length direction of the corresponding rectangular cavity. This is an ingenuity that the inventor came up with based on the fact that the first rectangular catalyst placement cavity and the second rectangular catalyst placement cavity are respectively rectangular cavities with a length greater than a width, combined with the phenomenon that the catalyst partition in the original cylindrical reactor is prone to collapse or damage.

[0094] Preferably, the catalyst separator 16 separates the catalyst placement layer 116 into a left-side rectangular catalyst placement cavity 16A and a right-side rectangular catalyst placement cavity 16B, the lengths of the left-side rectangular catalyst placement cavity 16A and the right-side rectangular catalyst placement cavity 16B are located in the front-to-back direction of the desulfurization reactor 11, and the widths are located in the left-to-right direction of the desulfurization reactor; at the same time, the second openable and closable operating port 119B of the desulfurization reactor 11 is arranged on the front side or rear side corresponding to the catalyst placement layer 116, and the third openable and closable operating port 119C of the desulfurization reactor 11 is arranged on the front side or rear side corresponding to the flue gas distribution layer 115. The advantage of such an arrangement is that the second openable and closable operating port 119B and the third openable and closable operating port 119C on the catalytic flue gas desulfurization tower can be concentrated at the front side and / or rear side of the catalytic flue gas desulfurization tower, and the cantilevered walkway that needs to be arranged on the side wall of the catalytic flue gas desulfurization tower in order to operate these second openable and closable operating ports 119B and the third openable and closable operating ports 119C can be arranged only at the front side and / or rear side of the catalytic flue gas desulfurization tower, while the left side and / or right side of the catalytic flue gas desulfurization tower does not need to be provided with a cantilevered walkway (for example, from Figure 20 You can see that the left and right sides of the catalytic flue gas desulfurization tower are used for staircases).

[0095] More preferably, the second openable and closable operation port 119B of the desulfurization reactor 11 is arranged on the rear side of the catalyst placement layer, which is equivalent to setting the second openable and closable operation port 119B on the opposite side of the air inlet 111, thereby avoiding the influence of the exhaust pipe network 15. Similarly, the third openable and closable operation port 119C is also preferably arranged on the rear side of the catalyst placement layer. At this time, the first openable and closable operation port 119A of the desulfurization reactor 11 can also be close to the rear side of the desulfurization reactor 11 (i.e., Figure 1 As shown, the first openable and closable operating port 119A is positioned near the second openable and closable operating port 119B, which further enhances the convenience of catalyst loading and unloading. Later in this specification, the use of a catalyst transfer device for catalytic flue gas desulfurization tower maintenance will be discussed. When the first openable and closable operating port 119A is positioned near the second openable and closable operating port 119B, the catalyst transfer device facilitates the transfer of catalyst from the desulfurization reactor on the N+1th layer to the desulfurization reactor on the Nth layer.

[0096] Typically, the air intake branch pipe 142 and the second branch 1234 of the input side control pipe network 123 (refer to Figure 1) all employ the curved structure described above, which forms a liquid seal when liquid is injected into the curved structure. Therefore, when the curved structure of the intake branch pipe 142 forms a liquid seal, the corresponding desulfurization reactor 11 no longer receives flue gas, allowing the catalyst 114 in the desulfurization reactor 11 to be washed and regenerated. When the curved structure on the second input-side branch 1234 forms a liquid seal, the flue gas in the corresponding desulfurization reactor 11 will not leak from the second input-side branch 1234, thereby maintaining the desulfurization operation of the desulfurization reactor 11.

[0097] The catalytic flue gas desulfurization tower of the above embodiment can be constructed and implemented in at least the following ways. These ways are described below. However, it should be noted that the specific ways and / or related technical contents involved below are not necessarily applicable only to the above embodiment, if applicable.

[0098] Method 1

[0099] The frame-type support structure 13 and each desulfurization reactor 11 on the frame-type support structure 13 are constructed as a reinforced concrete integrated structure. The reinforced concrete integrated structure includes left-side desulfurization reactor vertical column support columns 132A located at the four edges of the second rectangular body formed by the overall outline of the left-side desulfurization reactor vertical column 11A, right-side desulfurization reactor vertical column support columns 132B located at the four edges of the second rectangular body formed by the overall outline of the right-side desulfurization reactor vertical column 11B, beams 134 (cross beams) connected between the left-side desulfurization reactor vertical column support columns 132A and the right-side desulfurization reactor vertical column support columns 132B, lattice support beams 133 arranged below the bottom plate of the desulfurization reactor 11, and the outer shell of each desulfurization reactor 11. The concrete inner wall of the desulfurization reactor 11 can be paved with anti-corrosion materials, such as acid-resistant bricks.

[0100] Since the frame support structure 13 and each desulfurization reactor 11 on the frame support structure 13 are constructed as an integrated reinforced concrete structure, the frame support structure 13 and each desulfurization reactor 11 are constructed simultaneously, which can increase the construction speed of the catalytic flue gas desulfurization tower and reduce construction costs. The lattice support beam 133 below the bottom plate of the desulfurization reactor 11 can greatly enhance the strength of the bottom plate of the desulfurization reactor 11 (the lattice support beam 133 and the bottom plate of the desulfurization reactor 11 are an integrated concrete structure), thereby improving the overall strength and stability of the catalytic flue gas desulfurization tower. At the same time, the presence of the lattice support beam 133 means that the bottom plate of the desulfurization reactor 11 does not need to be set too thick, which helps to save construction materials and reduce the weight of the desulfurization reactor 11.

[0101] Specifically, the number of the above-mentioned left-side desulfurization reactor vertical support columns 132A is four, and the number of the above-mentioned right-side desulfurization reactor vertical support columns 132B is also four. Therefore, the number of the left-side desulfurization reactor vertical support columns 132A and the right-side desulfurization reactor vertical support columns 132B is eight in total.

[0102] Specifically, the lattice-type support beams 133 may include multiple support beams extending in the left-right direction of the desulfurization reactor 11 and evenly spaced apart in the front-to-back direction of the desulfurization reactor 11, or multiple support beams extending in the front-to-back direction of the desulfurization reactor 11 and evenly spaced apart in the left-to-right direction of the desulfurization reactor 11. Such lattice-type support beams 133 are particularly suitable for the aforementioned rectangular reactor and facilitate coordinated arrangement with the internal structure of the desulfurization reactor 11.

[0103] Since the catalyst in the desulfurization reactor 11 is supported by the air distribution support structure 118, the air distribution support structure 118 is a direct support component of the desulfurization reactor bottom plate. Therefore, the force points between the air distribution support structure 118 and the desulfurization reactor bottom plate can be distributed on the projection surface of the lattice support beam 133 on the surface of the desulfurization reactor bottom plate. In this way, the force applied to the desulfurization reactor bottom plate from the force points between the air distribution support structure 118 and the desulfurization reactor bottom plate produces as small a bending moment as possible on the lattice support beam 133.

[0104] The clever thing is that when the grid-type support beam 133 includes a plurality of support beams extending along the left-right direction of the desulfurization reactor 11 and evenly spaced along the front-back direction of the desulfurization reactor 11, or includes a plurality of support beams extending along the front-back direction of the desulfurization reactor 11 and evenly spaced along the left-right direction of the desulfurization reactor 11, it is just conducive to the uniform arrangement of the force points between the air distribution support structure 118 and the desulfurization reactor bottom plate on the projection surface of the grid-type support beam 133 on the surface of the desulfurization reactor bottom plate. For example, when the air distribution support structure 118 includes columns 1181 arranged in a planar array on the desulfurization reactor bottom plate and a catalyst breathable support structure supported above the columns 1181, the centers of these columns 1181 can be arranged in a rectangular array on the projection surface of the grid-type support beam 133 on the surface of the desulfurization reactor bottom plate (such as Figure 7 As shown), at this time, the number of columns 1181 carried by each support beam is consistent, so the force applied to the desulfurization reactor bottom plate from the force point between the air distribution support structure 118 and the desulfurization reactor bottom plate is completely evenly distributed on the grid support beam 133.

[0105] In addition, if a catalyst partition 16 is placed inside the desulfurization reactor above the air distribution support structure, and the catalyst partition 16 divides the catalyst placement layer into different rectangular catalyst placement cavities, then the projection position of the force point between the catalyst partition 16 and the air distribution support structure 118 on the bottom plate surface of the desulfurization reactor can be distributed on the projection surface of the grid support beam 133 on the bottom plate surface of the desulfurization reactor.

[0106] In the first embodiment, when constructing the catalytic flue gas desulfurization tower, the left-side desulfurization reactor row 11A and the right-side desulfurization reactor row 11B are spaced apart in the left-right width direction of the frame support structure 13, thereby forming a piping and equipment installation area 135 in the center of the frame support structure 13. The exhaust manifold 151 is placed in the piping and equipment installation area 135. Since the left-side desulfurization reactor row 11A and the right-side desulfurization reactor row 11B are spaced apart in the left-right width direction of the frame support structure 13, thereby forming a piping and equipment installation area 135 in the center of the frame support structure 13, the placement of the exhaust manifold 151 in the piping and equipment installation area 135 can reduce the space occupied by the catalytic flue gas desulfurization tower in the front-to-back direction.

[0107] In addition, the exhaust main pipe 151 is close to the rear side of the frame support structure 13 and can also serve as a chimney. On this basis, the output side control pipe network 122 and / or the input side control pipe network 123 can also be located in the pipeline equipment installation area 135 and in front of the exhaust main pipe 151. In this way, the pipeline layout of the regeneration liquid circulation system can be made more compact. In addition, when the input side control pipe network 123 is located in the pipeline equipment installation area 135 and in front of the exhaust main pipe 151, the input side main pipe 1231 will be located between the left desulfurization reactor vertical column 11A and the left and right desulfurization reactor vertical column 11B (such as Figure 6 As shown), in this case, the length of each of the second input branch lines 1234 connected to the input main pipe 1231 can be shortened and the structure can be simplified. Figure 1 As shown, the input side main pipe 1231 needs to be bent in the front-to-back direction to form the above-mentioned bent structure and then further bent in the left-to-right direction before it can be connected to the input side main pipe 1231. When the input side main pipe 1231 is located between the left desulfurization reactor vertical row 11A and the left and right desulfurization reactor vertical row 11B, each input side second branch 1234 connected to the input side main pipe 1231 only needs to be bent in the left-to-right direction to form the above-mentioned bent structure before it can be connected to the input side main pipe 1231.

[0108] The regeneration liquid circulation system may include a plurality of regeneration liquid tanks 121, which are arranged horizontally and in parallel at the bottom of the frame support structure 13. The output side control pipe network 122 includes an output side main pipe 1221 connected to the spray device of the desulfurization reactor 11 and output side first branches 1222 respectively connected between the output side main pipe 1221 and a corresponding regeneration liquid tank 121. Each output side first branch 1222 is correspondingly provided with an output side first control valve 1223. The regeneration liquid drive 124 device is connected in series to the output side main pipe 1221. The input side control network 123 includes an input side main pipe 1231 connected to the discharge port 113 of the desulfurization reactor 11 and input side first branches 1232 respectively connected between the input side main pipe 1231 and a corresponding regeneration liquid tank 121. Each input side first branch 1232 is correspondingly provided with an input side first control valve 1233. A reflux pipe 1224 is connected between the pipeline on the output side of the regeneration liquid driving device 124 on the output side main pipe 1221 and the input side main pipe. The reflux pipe 1224 is provided with a reflux pipe control valve 1225.

[0109] In the first embodiment, each regeneration liquid tank 121 of the regeneration liquid circulation system is made of a customized stainless steel or fiberglass container. The inner wall of each regeneration liquid tank can be paved with anti-corrosion materials, such as acid-resistant bricks.

[0110] Thus, dilute sulfuric acid with different concentrations can be stored in the multiple regeneration liquid tanks 121 as regeneration liquid. When the catalyst 114 in the selected desulfurization reactor 11 needs to be washed and regenerated, first, the inlet branch pipe 142 corresponding to the selected desulfurization reactor 11 is controlled to form a liquid seal, and then the output side first control valve 1223 and the input side first control valve 1233 corresponding to the regeneration liquid tank 121 storing the highest concentration of dilute sulfuric acid among the multiple regeneration liquid tanks 121 are opened, and then the dilute sulfuric acid in the regeneration liquid tank 121 storing the highest concentration of dilute sulfuric acid is delivered to the selected desulfurization reactor 11 through the corresponding output side first branch 1222, the regeneration liquid driving device 124 (usually a pump) and the output side main pipe 1221. A spray unit of the regeneration liquid spray device of the desulfurization reactor 11 regenerates the regeneration liquid after the catalyst regeneration, and then flows back to the original regeneration liquid tank 121 from the input side main pipe 1231 and the corresponding input side first branch 1232, and then switches to another spray unit; after washing and regenerating the catalyst with the highest concentration of dilute sulfuric acid for a period of time, the output side first control valve 1223 and the input side first control valve 1233 corresponding to the regeneration liquid tank 121 storing dilute sulfuric acid at a lower concentration among the multiple regeneration liquid tanks 121 are opened, and the catalyst is washed and regenerated again using the same method; repeating the above operation, the catalyst can also be washed and regenerated with dilute sulfuric acid or clean water with a lower concentration. In this way, the sulfuric acid on the active site of the catalyst can be more fully eluted, improving the regeneration effect of the catalyst.

[0111] In the first method, since the second openable and closable operating port 119B is arranged on the rear side of the catalyst placement layer 116, and the first openable and closable operating port 119A is close to the rear side of the desulfurization reactor 11, the exhaust branch pipe in the catalytic flue gas desulfurization tower can be arranged as follows: on the same floor of the frame support structure 13, the exhaust branch pipe 152 connected to the desulfurization reactor 11 belonging to the left desulfurization reactor vertical row 11A and the exhaust branch pipe 152 connected to the desulfurization reactor 11 belonging to the right desulfurization reactor vertical row 11B form a left-right symmetrical V-shaped structure and the exhaust port 112 on each desulfurization reactor 11 is located in front of the first openable and closable operating port 119A on the desulfurization reactor 112 (such as Figure 5 The V-shaped structure not only makes the exhaust port 112 on the desulfurization reactor 11 closer to the top center of the desulfurization reactor 11, thereby improving the uniformity of the gas pressure distribution inside the desulfurization reactor 11, but also makes the exhaust branch pipe 152 shorter while freeing up the operating space for entering and exiting the first openable and closable operating port 119A.

[0112] Method 2

[0113] On the basis of the first method, the frame support structure 13, the desulfurization reactors 11 on the frame support structure 13 and the multiple regeneration liquid tanks 121 included in the regeneration liquid circulation system are constructed into a reinforced concrete integrated structure, and the multiple regeneration liquid tanks constitute the lower part outline of the third rectangular body (such as Figure 6 Wherein, the concrete inner wall of the desulfurization reactor 11 and the inner wall of each regeneration liquid tank can be paved with anti-corrosion materials, such as acid-resistant bricks.

[0114] Because the frame support structure 13, the desulfurization reactors 11 on it, and the multiple regeneration liquid tanks 121 included in the regeneration liquid circulation system are constructed as a single reinforced concrete structure, the frame support structure 13, the desulfurization reactors 11, and the regeneration liquid tanks are constructed simultaneously, further speeding up the construction of the catalytic flue gas desulfurization tower and reducing construction costs. Because the regeneration liquid tanks are integrally connected to the lower portion of the frame support structure, the overall strength and stability of the catalytic flue gas desulfurization tower are further enhanced.

[0115] Among them, the reinforced concrete integrated structure includes left-side desulfurization reactor vertical column support columns 132A located at the four edges of the second rectangular body formed by the overall outline of the left-side desulfurization reactor vertical column 11A, right-side desulfurization reactor vertical column support columns 132B located at the four edges of the second rectangular body formed by the overall outline of the right-side desulfurization reactor vertical column 11B, beams 134 (cross beams) connected between the left-side desulfurization reactor vertical column support columns 132A and the right-side desulfurization reactor vertical column support columns 132B, grid-type support beams 133 arranged under the bottom plate of the desulfurization reactor 11, the outer shells of each desulfurization reactor 11, and the outer shells and middle partitions of multiple regeneration liquid tanks 121 (used to separate multiple regeneration liquid tanks 121 in the outer shell here). From Figure 6 It can be seen that the outer shells of the multiple regeneration liquid tanks constitute the lower outline of the third rectangular body.

[0116] Method 3

[0117] On the basis of method one or method two, when constructing a catalytic flue gas desulfurization tower, the left-side desulfurization reactor column 11A and the right-side desulfurization reactor column 11B are connected close to each other, and the desulfurization reactors 11 in the left-side desulfurization reactor column 11A located on each floor of the frame support structure 13 and the desulfurization reactors 11 in the right-side desulfurization reactor column 11B located on the corresponding floors of the frame support structure 13 are separated by a common wall to form their own reactor cavities.

[0118] Method 3, based on Method 1 or Method 2, expands the piping equipment installation area 135 into the desulfurization reactor 11 to facilitate loading more catalyst. Furthermore, because the desulfurization reactors 11 in the left desulfurization reactor row 11A, located on each floor of the frame support structure 13, and the desulfurization reactors 11 in the right desulfurization reactor row 11B, located on corresponding floors of the frame support structure 13, are separated by a common wall to form their own reactor cavities, this helps reduce the amount of concrete used and saves construction costs for the catalytic flue gas desulfurization tower.

[0119] In the third method, the exhaust manifold 151 needs to be moved further back, the output-side control pipe network 122 can be moved forward to the front side of the frame support structure 13, and the input-side control pipe network 123 can be moved back to the rear side of the frame support structure 13. Even so, the second openable and closable operating port 119B can still be arranged on the rear side of the catalyst placement layer 116, and the first openable and closable operating port 119A is close to the rear side of the desulfurization reactor 11. Therefore, the exhaust branch pipes in the catalytic flue gas desulfurization tower can still be arranged as follows: on the same floor of the frame support structure 13, the exhaust branch pipes 152 connected to the desulfurization reactor 11 belonging to the left desulfurization reactor vertical row 11A and the exhaust branch pipes 152 connected to the desulfurization reactor 11 belonging to the right desulfurization reactor vertical row 11B form a bilaterally symmetrical V-shaped structure, and the exhaust port 112 on each desulfurization reactor 11 is located in front of the first openable and closable operating port 119A on the desulfurization reactor 112.

[0120] In the third method, one option is to keep the number of the left desulfurization reactor vertical support columns 132A at four and the number of the right desulfurization reactor vertical support columns 132B at four, so that the total number of the left desulfurization reactor vertical support columns 132A and the right desulfurization reactor vertical support columns 132B remains eight. Another option is to use the two right columns of the left desulfurization reactor vertical support columns 132A and the two left columns of the right desulfurization reactor vertical support columns 132B as the same columns. In this way, the total number of the left desulfurization reactor vertical support columns 132A and the right desulfurization reactor vertical support columns 132B is reduced to six.

[0121] Method 4

[0122] The frame support structure 13 is constructed of steel, and each desulfurization reactor 11 is constructed using custom stainless steel or fiberglass containers. The frame support structure 13 and desulfurization reactor 11 are constructed separately and assembled later. Each regeneration tank also uses custom stainless steel or fiberglass containers. The concrete interior walls of the desulfurization reactor 11 and the interior walls of each regeneration tank can be paved with anti-corrosion materials, such as acid-resistant bricks.

[0123] The catalytic flue gas desulfurization device of the embodiment of the present application is described below. However, it should be noted that the catalytic flue gas desulfurization device and / or related technical content involved below can be applied to the above-mentioned catalytic flue gas desulfurization tower and / or desulfurization reactor, and can be applied to other catalytic desulfurization equipment.

[0124] Figure 14 This is a schematic diagram of the installation structure of the columns and main beams in a catalytic flue gas desulfurization device according to an embodiment of the present application. Figure 15 This is a schematic diagram of the installation structure of the columns and main beams in a catalytic flue gas desulfurization device according to an embodiment of the present application. Figure 16 This is a schematic diagram of the secondary beam installation structure in a catalytic flue gas desulfurization device according to an embodiment of the present application. Figure 17 for Figure 16 A local enlarged view of point I in FIG. Figure 18 For Figure 16 A structural diagram of a foundation in which acid-resistant bricks are laid on the main beam at intervals along the length direction of the main beam. Figure 19 This is a schematic diagram of the catalyst separator positioning groove structure in a catalytic flue gas desulfurization device according to an embodiment of the present application. Figure 10-19 , the internal structure of the desulfurization reactor is explained, and these internal structures can be applied to the above-mentioned catalytic flue gas desulfurization tower in whole or in part. It should be pointed out that Figure 14-19 The content is based on a cylindrical reactor as an example, but does not affect the overall or partial application of the relevant internal structure in a rectangular reactor.

[0125] like Figure 10-19 As shown, a catalytic flue gas desulfurization device of an embodiment of the present application can be used in the catalytic flue gas desulfurization tower of the present application, including a desulfurization reactor 11, having at least one air inlet 111, at least one exhaust port 112, at least one drain port 113, and a catalyst 114 located in the desulfurization reactor, and the desulfurization reactor 11 is provided with a spraying device for a regeneration liquid for washing and regenerating the catalyst 114; during desulfurization, the flue gas enters the desulfurization reactor 11 from the air inlet 111 and is then desulfurized by the catalyst 114 and then discharged from the exhaust port 112, and the sulfur dioxide in the flue gas reacts on the catalyst 114 when passing through the catalyst 114 to form sulfuric acid, and when the catalyst 114 is washed and regenerated, the sulfuric acid enters the regeneration liquid sprayed on the catalyst 114 and is discharged from the drain port.

[0126] In the catalytic flue gas desulfurization device, the interior of the desulfurization reactor 11 is divided into a flue gas distribution layer 115, a catalyst placement layer 116 and a flue gas overflow layer 117 from bottom to top. The flue gas distribution layer 115 is provided with a gas distribution support structure 118, and the catalyst 114 is placed in the catalyst placement layer 116 above the gas distribution support structure 118. During desulfurization, the flue gas enters the flue gas distribution layer 115 from the air inlet 111 and then passes through the gas distribution support structure 118 in a dispersed manner from bottom to top, passes through the catalyst 114, enters the flue gas overflow layer 117, and is discharged from the exhaust port 112.

[0127] The air distribution support structure 118 includes columns 1181 arranged in a plane array on the bottom plate of the desulfurization reactor and a catalyst permeable support structure supported above the columns 1181. The catalyst permeable support structure includes: a main beam layer 1182, the main beam layer includes a plurality of main beams extending along a first horizontal direction and arranged at intervals along a second horizontal direction perpendicular to the first horizontal direction, the main beams are divided into multiple sections of single-section main beams 1182A, and the two ends of the single-section main beam 1182A are respectively clamped on different columns 1181; a secondary beam layer 1183, the secondary beam layer 1183 is erected above the main beam layer 1182 and comprises a plurality of secondary beams extending along the second horizontal direction and arranged at intervals along the first horizontal direction, the secondary beams are divided into a plurality of single-section secondary beams 1183A, one end of the single-section main beam 1183A is clamped on the corresponding main beam and the other end is clamped on the corresponding main beam or the inner wall of the desulfurization reactor; and a catalyst supporting layer 1184, the catalyst supporting layer 1184 is laid on the secondary beam layer 1183 and is made of breathable material, and is used to place the catalyst 114.

[0128] Since the internal components of the desulfurization reactor 11 are constructed after the desulfurization reactor 11 shell is completed and secured to the frame-type support structure 13, the columns 1181 and the catalyst ventilation support structure also need to be installed after the desulfurization reactor 11 shell is completed and secured to the frame-type support structure 13. Generally speaking, after the desulfurization reactor shell is completed, only corresponding openable and closable operating openings (commonly known in engineering as "manholes") are reserved for workers to enter the desulfurization reactor to install the desulfurization reactor internal components, such as columns, main beams, and secondary beams. This is mainly because: if the desulfurization reactor is a reinforced concrete structure, the desulfurization reactor shell is cast as a single piece of concrete. If the desulfurization reactor uses a fiberglass reinforced plastic or stainless steel container, the manufacturer will manufacture the fiberglass reinforced plastic or stainless steel container before shipping it. From a practical perspective, reserving corresponding openable and closable operating openings (commonly known in engineering as "manholes") after the desulfurization reactor shell is completed for workers to enter the desulfurization reactor to install the desulfurization reactor internal components, such as columns, main beams, and secondary beams, is a more reasonable solution. By dividing the main beam into multiple sections of single-section main beams 1182A and clamping the ends of the single-section main beams 1182A to different columns 1181, and dividing the secondary beam into multiple sections of single-section secondary beams 1183A and clamping one end of the single-section main beam 1183A to the corresponding main beam and the other end to the corresponding main beam or the inner wall of the desulfurization reactor, the difficulty of transporting the single-section main beams 1182A and the single-section secondary beams 1183A to the desulfurization reactor 11 is greatly reduced because the single-section main beams 1182A are shorter and lighter than the main beams, and the single-section secondary beams 1183A are shorter and lighter than the secondary beams. At the same time, the difficulty of workers building the main beam layer 1182 and the secondary beam layer 1183 is also greatly reduced after the clamping method is adopted. The clamping method not only facilitates the connection, but also ensures the connection strength.

[0129] Optionally, the top surface of the column 1181 is provided with a main beam placement slot 1181A, and the end of the single-section main beam 1182A is clamped in the main beam placement slot 1181A on the top surface of the corresponding column 1181 (such as Figure 15 Preferably, acid-resistant bricks 17 may be laid on the top surface of the column 1181 and the top surface of the main beam placement slot 1181A, and then the end of the single-section main beam 1182A may be clamped into the main beam placement slot 1181A on the top surface of the corresponding column 1181, so as to prevent corrosion caused by sulfuric acid solution in the main beam placement slot 1181A.

[0130] Optionally, the single-section main beam 1182A is assembled from at least two independent single-section main beam monomers, and the length of the single-section main beam monomers in the single-section main beam is consistent with that of the single-section main beam (e.g. Figure 15 As shown, the single-section main beam 1182A is actually divided into two parts. This can further reduce the weight of the single-section main beam and facilitate operation.

[0131] Optionally, acid-resistant bricks 17 are laid on the main beam at intervals along the length direction of the main beam, and a first beam placement slot 171 is formed between adjacent acid-resistant bricks 17 on the main beam, and the end of the single-section secondary beam 1183A is clamped in the corresponding first beam placement slot 171 (such as Figure 18 As shown). Thus, the end of the single-section secondary beam 1183A is clamped to the main beam.

[0132] Optionally, an inner edge plate 18 is provided on the inner wall of the desulfurization reactor, and acid-resistant bricks 17 are laid on the inner wall of the desulfurization reactor above the inner edge plate and at intervals along the circumference of the inner edge plate. Secondary beam placement slots 172 are formed between adjacent acid-resistant bricks 17 laid at intervals along the circumference of the inner edge plate 18, and the end of the single-section secondary beam 1183A is placed on the inner edge plate 18 and clamped in the corresponding secondary beam placement slot 172 (such as Figure 16-17 As shown). Thus, the end of the single-section secondary beam 1183A is clamped to the inner wall of the desulfurization reactor.

[0133] Optionally, a buffer sealing material 19 is provided between the end of the secondary beam close to the inner wall of the desulfurization reactor and the inner wall of the desulfurization reactor. The buffer sealing material 19 can be made of rubber.

[0134] Optionally, the catalyst supporting layer 1184 includes a grid made of PP material and an open-pore tetrafluoroethylene plate laid sequentially from bottom to top.

[0135] Preferably, the spacing between any column 1181 and the adjacent column 1181 in the planar array of the columns 1181 on the bottom plate of the desulfurization reactor, as well as the length of the single-section main beam 1182A and the length of the single-section secondary beam 1183A are all 800mm-1800mm, preferably 1000-1600mm.

[0136] like Figure 10-19 As shown, a catalytic flue gas desulfurization device of an embodiment of the present application can be used in the catalytic flue gas desulfurization tower of the present application, including a desulfurization reactor 11, having at least one air inlet 111, at least one exhaust port 112, at least one drain port 113, and a catalyst 114 located in the desulfurization reactor, and the desulfurization reactor 11 is provided with a spraying device for a regeneration liquid for washing and regenerating the catalyst 114; during desulfurization, the flue gas enters the desulfurization reactor 11 from the air inlet 111 and is then desulfurized by the catalyst 114 and then discharged from the exhaust port 112, and the sulfur dioxide in the flue gas reacts on the catalyst 114 when passing through the catalyst 114 to form sulfuric acid, and when the catalyst 114 is washed and regenerated, the sulfuric acid enters the regeneration liquid sprayed on the catalyst 114 and is discharged from the drain port.

[0137] In the catalytic flue gas desulfurization device, the interior of the desulfurization reactor 11 is divided into a flue gas distribution layer 115, a catalyst placement layer 116 and a flue gas overflow layer 117 from bottom to top. The flue gas distribution layer 115 is provided with a gas distribution support structure 118, and the catalyst 114 is placed in the catalyst placement layer 116 above the gas distribution support structure 118. During desulfurization, the flue gas enters the flue gas distribution layer 115 from the air inlet 111 and then passes through the gas distribution support structure 118 in a dispersed manner from bottom to top, passes through the catalyst 114, enters the flue gas overflow layer 117, and is discharged from the exhaust port 112.

[0138] Among them, a catalyst separator 16 is placed inside the desulfurization reactor 11 above the gas distribution support structure 118, and the catalyst separator 16 divides the catalyst placement layer 116 into different catalyst placement cavities; the catalyst separator 16 includes a main board 161 arranged along the first vertical surface and used to separate the catalyst placement layer, and wing plates 162 arranged along the second vertical surface and connected to both sides of the main board 161 and spaced apart along the length direction of the main board.

[0139] In addition, the spraying device includes a spraying unit that can independently spray the regeneration liquid on the catalysts in the different catalyst placement cavities.

[0140] Because the catalyst separator 16 comprises a main plate 161, disposed along a first vertical surface and used to separate the catalyst placement layer, and wing plates 162, disposed along a second vertical surface and connected to both sides of the main plate 161 and spaced apart along the length of the main plate, the wing plates 162 provide support for the main plate 161 during catalyst loading, effectively preventing the main plate 161 from being squeezed by the catalyst and tipping over. Furthermore, when loading the catalyst, the wing plates 162 mitigate the vertical impact force on the catalyst separator 16 caused by the rapid flow of the catalyst into the catalyst placement layer, preventing the main plate 161 from cracking or being damaged.

[0141] Optionally, the wing plates 162 connected to both sides of the main plate 161 are arranged symmetrically with respect to the main plate surface. Furthermore, the width of the wing plates 162 can gradually increase from top to bottom. For example, the two wing plates 162 connected to both sides of the main plate 161 and arranged symmetrically with respect to the main plate 161 surface can form a trapezoidal or conical structure, which can further improve the stability of the catalyst separator 16.

[0142] Optionally, the catalyst separator 16 further includes a bottom plate 163 arranged along a horizontal plane and connected to the bottom surfaces of the main plate 161 and the wing plate 162 , thereby further improving the stability of the catalyst separator 16 .

[0143] Optionally, the catalyst separator 16 is assembled from polytetrafluoroethylene sheets. Optionally, the catalyst separator 16 is formed by assembling inside the catalyst placement layer 116. Polytetrafluoroethylene sheets are highly resistant to acid corrosion, lightweight, and high in strength, making them very suitable for making catalyst separators 16.

[0144] In addition, a grid-type support beam 133 is provided under the bottom plate of the desulfurization reactor, and the force points between the wing plate 162 and the air distribution support structure 118 are distributed on the projection surface of the grid-type support beam 133 on the bottom plate surface of the desulfurization reactor.

[0145] The air distribution support structure 118 may include columns 1181 arranged in a plane array on the bottom plate of the desulfurization reactor and a catalyst breathable support structure supported above the columns. The catalyst partition 116 is placed above the catalyst breathable support structure. The columns 1181 are arrayed on the projection surface of the lattice support beam 133 on the surface of the bottom plate of the desulfurization reactor. The force points between the wing plate 162 and the catalyst breathable support structure are distributed on the projection surface of the lattice support beam on the surface of the bottom plate of the desulfurization reactor at the projection position of the bottom plate of the desulfurization reactor.

[0146] like Figure 10-19 As shown, a catalytic flue gas desulfurization device of an embodiment of the present application can be used in the catalytic flue gas desulfurization tower of the present application, including a desulfurization reactor 11, having at least one air inlet 111, at least one exhaust port 112, at least one drain port 113, and a catalyst 114 located in the desulfurization reactor, and the desulfurization reactor 11 is provided with a spraying device for a regeneration liquid for washing and regenerating the catalyst 114; during desulfurization, the flue gas enters the desulfurization reactor 11 from the air inlet 111 and is then desulfurized by the catalyst 114 and then discharged from the exhaust port 112, and the sulfur dioxide in the flue gas reacts on the catalyst 114 when passing through the catalyst 114 to form sulfuric acid, and when the catalyst 114 is washed and regenerated, the sulfuric acid enters the regeneration liquid sprayed on the catalyst 114 and is discharged from the drain port.

[0147] In the catalytic flue gas desulfurization device, the interior of the desulfurization reactor 11 is divided into a flue gas distribution layer 115, a catalyst placement layer 116 and a flue gas overflow layer 117 from bottom to top. The flue gas distribution layer 115 is provided with a gas distribution support structure 118, and the catalyst 114 is placed in the catalyst placement layer 116 above the gas distribution support structure 118. During desulfurization, the flue gas enters the flue gas distribution layer 115 from the air inlet 111 and then passes through the gas distribution support structure 118 in a dispersed manner from bottom to top, passes through the catalyst 114, enters the flue gas overflow layer 117, and is discharged from the exhaust port 112.

[0148] Among them, the catalyst separator 16 is placed above the gas distribution support structure 118 inside the desulfurization reactor 11, and the catalyst separator 16 divides the catalyst placement layer 116 into different catalyst placement cavities; the portion on the inner wall of the desulfurization reactor that is used to contact the edge of the catalyst separator 116 is provided with a positioning groove 20 (such as Figure 19 shown).

[0149] In addition, the spraying device includes a spraying unit that can independently spray the regeneration liquid on the catalysts in the different catalyst placement cavities.

[0150] Optionally, the inner wall of the desulfurization reactor is paved with corrosion-resistant material to form the positioning groove 20; preferably, the inner wall of the desulfurization reactor is paved with gaps in acid-resistant tiles 17 to form the positioning groove.

[0151] Since the portion on the inner wall of the desulfurization reactor that contacts the edge of the catalyst partition 116 is provided with a positioning groove 20 that is snap-fitted with the edge of the catalyst partition to prevent the catalyst partition from moving to the sides of the catalyst partition, the positioning groove 20 can effectively prevent the catalyst partition 116 from being squeezed by the catalyst and falling over when the catalyst is loaded.

[0152] Under the premise of paving the corrosion-resistant material on the inner wall of the desulfurization reactor and forming the positioning groove 20, when paving the corrosion-resistant material, the corrosion-resistant material can be first laid on the inner wall of the desulfurization reactor on the side where the catalyst separator 16 is to be placed, and then the catalyst separator 16 is preliminarily placed. Finally, the corrosion-resistant material is laid on the inner wall of the desulfurization reactor on the other side of the catalyst separator 16 to be placed. In this way, the positioning groove 20 can be formed and the catalyst separator 16 can be stuck in the positioning groove 20. In addition, this operation method is also more convenient for workers to operate.

[0153] A catalytic flue gas desulfurization device according to an embodiment of the present application can be used in the catalytic flue gas desulfurization tower of the present application, comprising a desulfurization reactor having at least one air inlet, at least one exhaust port, at least one liquid discharge port, and a catalyst located in the desulfurization reactor, wherein the desulfurization reactor is provided with a spraying device for a regeneration liquid for washing and regenerating the catalyst; during desulfurization, the flue gas enters the desulfurization reactor from the air inlet and is then desulfurized by the catalyst and then discharged from the exhaust port; the sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid when passing through the catalyst; when the catalyst is washed and regenerated, the sulfuric acid enters the regeneration liquid sprayed on the catalyst and is discharged from the liquid discharge port.

[0154] In the catalytic flue gas desulfurization device, the interior of the desulfurization reactor is divided into a flue gas distribution layer, a catalyst placement layer and a flue gas overflow layer from bottom to top. The flue gas distribution layer is provided with a gas distribution support structure, and the catalyst is placed in the catalyst placement layer above the gas distribution support structure. During desulfurization, the flue gas enters the flue gas distribution layer from the air inlet and then passes through the catalyst in a dispersed manner from bottom to top through the gas distribution support structure and enters the flue gas overflow layer and is discharged from the exhaust port.

[0155] In which, the desulfurization reactor also has at least one first openable and closable operating port, at least one second openable and closable operating port and at least one third openable and closable operating port. The first openable and closable operating port can be used to load the catalyst into the desulfurization reactor, the second openable and closable operating port can be used to unload the catalyst from the desulfurization reactor, and the third openable and closable operating port can be used to operate the air distribution support structure.

[0156] In addition, the air inlet of the desulfurization reactor is arranged on the side of the flue gas distribution layer, the exhaust port and the first openable and closable operating port of the desulfurization reactor are arranged on the top surface of the flue gas overflow layer, the second openable and closable operating port of the desulfurization reactor is arranged on the side of the catalyst placement layer and close to the bottom of the catalyst placement layer, the third openable and closable operating port of the desulfurization reactor is arranged on the side or bottom surface of the flue gas distribution layer, and the liquid discharge port of the desulfurization reactor is arranged on the bottom surface of the flue gas distribution layer.

[0157] Optionally, to improve the convenience of catalyst loading and unloading, the at least one first openable and closable operating port 119A is located close to the at least one second openable and closable operating port 119B. Optionally, if the desulfurization reactor outline forms a first rectangular body, the at least one first openable and closable operating port 119A is located close to the side of the desulfurization reactor where the at least one second openable and closable operating port 119B is arranged; if the desulfurization reactor outline forms a cylinder, the angle between the line connecting the center of the at least one first openable and closable operating port 119A and the center of the cylinder and the line connecting the center of the at least one second openable and closable operating port 119B and the center of the cylinder is ≤45°.

[0158] Optionally, to improve the convenience of loading and unloading the catalyst, the direction of the at least one second openable and closable operating port 119B deviates from the direction of the at least one air inlet 111. Optionally, if the outline of the desulfurization reactor constitutes a first rectangular body, the at least one second openable and closable operating port 119B is arranged on the side opposite to or beside the side of the desulfurization reactor on which the at least one air inlet is arranged; if the outline of the desulfurization reactor constitutes a cylinder, the angle between the line connecting the center of the at least one second openable and closable operating port 119B and the center of the cylinder and the line connecting the center of the at least one air inlet 111 and the center of the cylinder is ≥45°.

[0159] In the above-mentioned catalytic flue gas desulfurization tower of the present application, a catalyst conveying device installation operation platform is provided on the side wall of the non-bottom-layer desulfurization reactor 11 in the left-side desulfurization reactor column and / or the right-side desulfurization reactor column, located at the second openable and closable operation port 119B. The catalyst conveying device installation operation platform is used to install and operate the catalyst conveying device. The catalyst conveying device includes a material receiving funnel 21 and a feeding pipe connected to the material receiving funnel 21. The material receiving funnel 21 can be used to receive the catalyst flowing out from the corresponding second openable and closable operation port 119B, and can also be used to receive the catalyst hoisted to the top of the material receiving funnel. The feeding pipe can be connected to the first openable and closable operation port 119A on the top surface of the next layer of desulfurization reactor 11, and can also be connected to a preset catalyst accumulation area (usually a set area on the ground).

[0160] Specifically, the upper portion of the receiving hopper 21 is open, and this opening can be aligned with the corresponding second openable and closable operating port 119B, thereby receiving the catalyst flowing out of the corresponding second openable and closable operating port 119B. In addition, since the catalyst conveyor is installed above the operating platform without any obstacles, the catalyst can also be hoisted to the top of this opening using a hoisting device. In this way, the receiving hopper 21 can be used to receive the catalyst flowing out of the corresponding second openable and closable operating port 119B as well as to receive the catalyst hoisted to the top of the receiving hopper.

[0161] Optionally, the receiving hopper and the feed pipe are movable relative to each other. When the feed pipe moves to a first position, the feed pipe is connected to the first openable and closable operating port 119A on the top surface of the next desulfurization reactor 11. When the feed pipe moves to a second position, the feed pipe is connected to a predetermined catalyst accumulation area. Typically, the feed pipe can be a flexible hose, which allows the feed pipe to be connected to both the first openable and closable operating port 119A on the top surface of the next desulfurization reactor 11 and the predetermined catalyst accumulation area.

[0162] Optionally, the catalyst transfer device installation operation platform is provided by a cantilevered walkway on the side wall of the catalytic flue gas desulfurization tower. In this case, the position of the cantilevered walkway can be designed accordingly to meet the above requirements.

[0163] Preferably, in the vertical row of desulfurization reactors on the left, the directions of the first openable and closeable operating ports of each desulfurization reactor are consistent, and the directions of the second openable and closeable operating ports of each desulfurization reactor are consistent; in each desulfurization reactor in the vertical row of desulfurization reactors on the left, the orientation of one openable and closeable operating port is close to the orientation of the second openable and closeable operating port; and / or, in the vertical row of desulfurization reactors on the right, the directions of the first openable and closeable operating ports of each desulfurization reactor are consistent, and the directions of the second openable and closeable operating ports of each desulfurization reactor are consistent; in each desulfurization reactor in the vertical row of desulfurization reactors on the right, the orientation of the first openable and closeable operating port is close to the orientation of the second openable and closeable operating port.

[0164] Figure 21 This is a photo of the maintenance process of a catalytic flue gas desulfurization tower in the embodiment of this application. Figure 21 As shown, based on the layout of the first openable and closable operating port and the second openable and closable operating port in the above-mentioned catalytic flue gas desulfurization tower, a catalytic flue gas desulfurization tower maintenance method of an embodiment of the present application can be implemented. The method is used for the maintenance of a catalytic flue gas desulfurization tower, including: unloading the catalyst in the desulfurization reactor of the Nth layer in the left desulfurization reactor column and / or the right desulfurization reactor column, and then maintaining the desulfurization reactor of the Nth layer (for example, repairing or replacing the catalyst partition 16 and / or the catalyst supporting layer 1184), where N is an integer ≥1; transferring the catalyst in the desulfurization reactor of the N+1th layer to the desulfurization reactor of the Nth layer through the catalyst conveying device, and then maintaining the desulfurization reactor of the N+1th layer. Based on the layout of the first openable and closable operating port and the second openable and closable operating port in the above-mentioned catalytic flue gas desulfurization tower, the position of the first openable and closable operating port 119A of the desulfurization reactor on the N+1 layer is close to the position of the second openable and closable operating port 119B of the desulfurization reactor on the N layer. Therefore, the catalyst in the desulfurization reactor on the N+1 layer can be transferred to the desulfurization reactor on the N layer through the catalyst conveying device (the receiving funnel and the feeding pipe connected to the receiving funnel 21).

[0165] The method adopts the method of unloading the catalyst in the desulfurization reactor of the Nth layer in the left-side desulfurization reactor column and / or the right-side desulfurization reactor column, and then maintaining the desulfurization reactor of the Nth layer, and then transferring the catalyst in the desulfurization reactor of the N+1th layer to the desulfurization reactor of the Nth layer through the catalyst conveying device, and then maintaining the desulfurization reactor of the N+1th layer. Compared with the original method of unloading the catalyst in each layer of desulfurization reactor to the catalyst accumulation area for maintenance and then reloading the catalyst, the number of catalyst loading times can be saved, thereby saving maintenance costs.

[0166] Figure 22 This is a schematic diagram of a regeneration liquid discharge structure of a catalytic flue gas desulfurization device in an embodiment of the present application. Figure 23 This is a schematic diagram of the partial structure of a catalytic flue gas desulfurization tower in an embodiment of the present application. Figure 23 It can reflect the regeneration liquid discharge structure and cooling liquid spraying device of the catalytic flue gas desulfurization device. The regeneration liquid discharge structure of the catalytic flue gas desulfurization device is used in the above-mentioned catalytic flue gas desulfurization tower as a regeneration liquid circulation system or more precisely as a part of the input side control pipe network. Figure 22-23 As shown, the regeneration liquid drainage structure of the catalytic flue gas desulfurization device includes a first drainage pipe (here specifically composed of the input side main pipe 1231) and a second drainage pipe (here specifically each input side second branch 1234), the first drainage pipe is arranged from top to bottom, the upper end of the first drainage pipe is connected to the atmospheric environment through the ventilation control valve 1231a and the lower end is used to connect to the regeneration liquid tank 121; the second drainage pipe is arranged on the side of the first drainage pipe and has a curved structure (i.e., a U-shaped liquid seal) that extends downward, then turns back and extends upward, one end of the second drainage pipe is connected to the corresponding drainage port 113 and the other end is connected to the wall of the first drainage pipe. Furthermore, in the regeneration liquid discharge structure of the catalytic flue gas desulfurization device, when the vent control valve 1231a is opened to a set state, the first liquid discharge pipe is connected to the atmospheric environment, and a first pressure environment is formed in the first liquid discharge pipe during the washing and regeneration process. The first pressure environment can automatically maintain the regeneration liquid in the curved structure connected to the first liquid discharge pipe, so that the curved structure forms a liquid seal. When the vent control valve 1231a is closed to a set state, the first liquid discharge pipe is isolated from the atmospheric environment, and a second pressure environment is formed in the first liquid discharge pipe during the washing and regeneration process. The second pressure environment can automatically pump the regeneration liquid in the curved structure connected to the first liquid discharge pipe into the regeneration liquid tank 121. The vent control valve 1231a can be a stop valve (such as a ball valve), a flow control valve, or the like.

[0167] When used in the above-mentioned catalytic flue gas desulfurization tower, the regeneration liquid discharge structure of the above-mentioned catalytic flue gas desulfurization device can control whether each input side second branch 1234 forms a liquid seal by adjusting the opening of the ventilation control valve 1231a: when a liquid seal needs to be formed, the ventilation control valve 1231a is opened to the set state. Thus, when part of the desulfurization reactor is in the said washing and regeneration process, the upper end of the input side main pipe 1231 breaks the negative pressure through the ventilation control valve 1231a, avoiding the regeneration liquid from flowing in the input side main pipe 1231 to generate negative pressure in the input side main pipe 1231 and draw out the liquid in the U-shaped liquid seals of the other input side second branches 1234 other than the input side second branch 1234 that is discharging the regeneration liquid, causing the liquid to be in the U-shaped liquid seals of the input side second branches 1234 that are in the washing and regeneration process. The flue gas in the desulfurization reactor 11 in the desulfurization state leaks from the drain port 113 of the desulfurization reactor 11, and at the end of the washing and regeneration process, the curved structure of the second input branch 1234 used to discharge the regeneration liquid will automatically maintain the regeneration liquid that forms a liquid seal with the curved structure; when the liquid seal is not needed, the vent control valve 1231a is closed to the set state. When some desulfurization reactors are in the washing and regeneration process, a negative pressure state is formed in the input main pipe 1231, which can automatically draw the regeneration liquid in the U-shaped liquid seal in any one or several input second branches 1234 connected to the input main pipe 1231 into the regeneration liquid tank to facilitate maintenance and repair of the corresponding desulfurization reactor 11. Based on the above principle, it should be understood that when the vent control valve 1231a is closed to the set state to isolate the first drain pipe from the atmospheric environment, it does not necessarily mean that the first drain pipe is completely separated from the atmospheric environment, that is, the meaning of "isolation" should be relative.

[0168] Typically, the diameter of the input-side main pipe 1231 is relatively large. If the ventilation control valve 1231a is directly installed on the upper end of the input-side main pipe 1231, the specifications of the selected ventilation control valve 1231a will also be relatively large, resulting in a high installation and use cost of the ventilation control valve 1231a. Therefore, the following design can be adopted: a sealing cover is installed on the upper end of the input-side main pipe 1231 to seal the upper end of the input-side main pipe 1231, and then an air guide tube 1231b with a diameter smaller than that of the input-side main pipe 1231 is installed on the sealing cover, and the ventilation control valve 1231a is set on the air guide tube 1231b. It should be noted that the diameter of the air guide tube 1231b cannot be too small, otherwise, even if the ventilation control valve 1231a is fully opened, it is still easy to cause negative pressure to form in the input-side main pipe 1231. In short, the diameter of the air guide tube 1231b and the specifications of the ventilation control valve 1231a need to be reasonably selected so that the upper end of the input side main pipe 1231 can achieve the effect of breaking the negative pressure through the air guide tube 1231b and the ventilation control valve 1231a. At the same time, since the diameter of the air guide tube 1231b is smaller than that of the input side main pipe 1231, the installation and use cost of the ventilation control valve 1231a is greatly reduced.

[0169] As a further improvement to the regeneration liquid drainage structure of the catalytic flue gas desulfurization device described above, the wall of the second drain pipe (i.e., each input-side second branch 1234) within the gas-liquid separation surface near the input end of the liquid seal pipe is made of plastic. The strength, chemical stability, and heat deformation temperature of this plastic during use are similar to or better than those of polypropylene (PP). Based on the inventor's discovery that stainless steel and other metal wall materials within the gas-liquid separation surface near the input end of the liquid seal pipe in the U-shaped liquid seal of the input-side second branch 1234 are susceptible to corrosion, although this phenomenon and its cause have not been disclosed, it is speculated that because the gas-liquid separation surface near the input end of the liquid seal pipe in the U-shaped liquid seal is simultaneously exposed to a liquid containing a sulfuric acid solution (i.e., the regeneration liquid) and a high-temperature gas containing sulfur oxides (i.e., the flue gas), and chemical and electrochemical corrosion conditions are superimposed, the use of plastic pipes that meet the specified requirements has been verified in actual use to effectively resolve the above-mentioned corrosion problem.

[0170] Optionally, the plastic is made of polypropylene (PP) plastic or polytetrafluoroethylene (PTFE) plastic. Preferably, the polypropylene (PP) plastic is glass fiber reinforced polypropylene (FRPP) plastic or polypropylene homopolymer (PPH) plastic. The strength and heat deformation temperature of glass fiber reinforced polypropylene (FRPP) plastic or polypropylene homopolymer (PPH) plastic are improved compared to polypropylene (PP) plastic, and the price has obvious advantages over polytetrafluoroethylene (PTFE) plastic. Optionally, the second drain pipe is made of the plastic. Optionally, the first drain pipe is also made of the plastic. Preferably, the tube wall where the gas-liquid separation surface in the U-shaped liquid seal is located includes two inner and outer layers of the plastic formed by fusion welding. This can further improve the corrosion resistance of the tube wall where the gas-liquid separation surface in the U-shaped liquid seal is located, and enhance the anti-leakage ability. It should be emphasized here that the method of forming the inner and outer layers of the plastic on the tube wall where the gas-liquid separation surface in the U-shaped liquid seal is located by fusion welding is an original practice of the inventor. The specific positions of the inner and outer layers of the plastic formed by the fusion welding process can be found in . Figure 22 The mark I in the middle corresponds to the site indicated by the arrow.

[0171] In the aforementioned method 1, the left-side desulfurization reactor vertical row 11A and the right-side desulfurization reactor vertical row 11B are spaced apart in the left and right width directions of the frame support structure 13, thereby forming a pipeline equipment installation area 135 in the middle of the frame support structure 13. The output-side control pipe network 122 and / or the input-side control pipe network 123 can be located in the pipeline equipment installation area 135. When the input-side control pipe network 123 is located in the pipeline equipment installation area 135, the input-side main pipe 1231 will be located between the left-side desulfurization reactor vertical row 11A and the right-side desulfurization reactor vertical row 11B (such as Figure 6As shown), in this case, the length of each of the second input branch lines 1234 connected to the input main pipe 1231 can be shortened and the structure can be simplified. Figure 1 As shown, the input side main pipe 1231 needs to be bent in the front-to-back direction to form the above-mentioned bent structure and then further bent in the left-to-right direction before it can be connected to the input side main pipe 1231. When the input side main pipe 1231 is located between the left desulfurization reactor vertical row 11A and the right desulfurization reactor vertical row 11B, each input side second branch 1234 connected to the input side main pipe 1231 only needs to be bent in the left-to-right direction to form the above-mentioned bent structure before it can be connected to the input side main pipe 1231 (as shown in FIG. Figure 22 As shown), at this time, the length of each input side second branch 1234 pipeline is shortened, and the center line of each input side second branch 1234 connected to the input side main pipe 1231 and the center line of the input side main pipe 1231 are located on the same vertical plane (as shown). Figure 23 As shown), the manufacturing and installation of the second branch 1234 on the input side is more convenient. Figure 22-23 As shown, the curved portion of each input-side second branch 1234 adopts an arc transition, including the curved structure of each input-side second branch 1234. In addition, the end of each input-side second branch 1234 connected to the corresponding drain port 113 is higher than the end connected to the wall of the input-side main pipe 1231.

[0172] During operation of a catalytic flue gas desulfurization tower, some desulfurization reactors 11 are often in the desulfurization state while others are in the scrubbing and regeneration state. Typically, one desulfurization reactor 11 is reserved for the scrubbing and regeneration state, while the remaining desulfurization reactors 11 are in the desulfurization state. In this case, the diameter of each input-side second branch 1234 connected to the input-side main pipe 1231 can be designed to be consistent with the diameter of the input-side main pipe 1231. After a desulfurization reactor 11 completes the scrubbing and regeneration state, it switches to the desulfurization state. Accordingly, a desulfurization reactor 11 in the desulfurization state switches to the scrubbing and regeneration state. However, when flue gas temperatures are high (for example, flue gas temperatures in the coking industry often reach 180°C), the catalyst temperature is also high. Directly switching a desulfurization reactor 11 in the desulfurization state to the scrubbing and regeneration state and immediately scrubbing and regenerating the catalyst in that desulfurization reactor 11 can easily cause the catalyst to break due to the large temperature difference. To this end, the following method for washing and regenerating the catalyst of a catalytic flue gas desulfurization device is provided. The catalyst can be cooled before washing and regenerating to solve the technical problem of catalyst breakage due to a large temperature difference between the front and rear surfaces.

[0173] Figure 24This is a schematic flow chart of a catalyst washing and regeneration method for a catalytic flue gas desulfurization device according to an embodiment of the present application. Figure 24 As shown, a catalyst washing and regeneration method for a catalytic flue gas desulfurization device, for a desulfurization reactor 11 to be switched to the washing and regeneration state, specifically includes the following operations:

[0174] Step S11: Cut off the flue gas intake, and then introduce catalyst cooling gas with a temperature lower than the flue gas temperature during desulfurization into the desulfurization reactor, so that the catalyst cooling gas passes through the catalyst and carries the heat in the catalyst before being discharged from the exhaust port.

[0175] Step S12: After the catalyst is cooled to a set condition, the spray device is started to spray the regeneration liquid onto the catalyst through the spray device to wash and regenerate the catalyst and discharge the regeneration liquid from the drain port.

[0176] The catalyst cooling gas can be an inert gas, such as nitrogen. The temperature of the catalyst cooling gas is generally 10°C-80°C, preferably 15°C-70°C. Generally speaking, the flow rate of the catalyst cooling gas is ≥ the spray flow rate of the regeneration liquid during washing and regeneration and ≤ the flue gas intake flow rate during desulfurization. If possible, a heat exchanger can be used to exchange heat between the process medium at the location of the catalytic flue gas desulfurization tower (such as the flue gas to be desulfurized emitted by an industrial kiln) and the catalyst cooling gas, thereby heating the catalyst cooling gas and then using the heated catalyst cooling gas to cool the catalyst.

[0177] Generally speaking, the setting condition is to cool the catalyst temperature to ≤80°C, preferably to cool the catalyst temperature to within 30°C higher than the regeneration liquid temperature.

[0178] The flue gas inlet passage can be used to introduce catalyst cooling gas into the desulfurization reactor. For example, a catalyst cooling gas delivery pipe can be connected to each intake branch pipe 142. After the flue gas inlet to a selected intake branch pipe 142 is cut off (by using a U-shaped liquid seal on the intake branch pipe 142 to cut off the flue gas inlet to that intake branch pipe 142), the catalyst cooling gas can be introduced into the corresponding desulfurization reactor 11 through the catalyst cooling gas delivery pipe.

[0179] The above-mentioned catalytic flue gas desulfurization device catalyst washing and regeneration method can solve the technical problem of catalyst breakage due to the large temperature difference between the front and back of the catalyst by cooling the catalyst before washing and regenerating it. However, since this method uses catalyst cooling gas, when the catalyst cooling gas supply is relatively small, the catalyst cooling time is long (for example, for a desulfurization reactor with a flue gas intake volume of tens of thousands of cubic meters per hour, when the catalyst cooling gas flow rate is 1000Nm 3 / h, the cooling time takes about 10 hours); and if the catalyst cooling gas supply is relatively large, the catalyst cooling gas consumption and energy consumption will be high.

[0180] To this end, another catalyst washing and regeneration method for a catalytic flue gas desulfurization device is provided. Figure 25 This is a schematic flow chart of a catalyst washing and regeneration method for a catalytic flue gas desulfurization device according to an embodiment of the present application. Figure 25 As shown, a catalyst washing and regeneration method for a catalytic flue gas desulfurization device, for a desulfurization reactor 11 to be switched to the washing and regeneration state, specifically includes the following operations:

[0181] Step S21: spraying coolant into the flue gas intake passage to cool the flue gas, then introducing the cooled flue gas into the desulfurization reactor, allowing the cooled flue gas to pass through the catalyst and carry the heat in the catalyst before being discharged from the exhaust port.

[0182] Step S22: After the catalyst is cooled to a set condition, the spray device is started to spray the regeneration liquid onto the catalyst through the spray device to wash and regenerate the catalyst and discharge the regeneration liquid from the drain port.

[0183] Based on the above content, it can be seen that the air intake branch pipe 142 has a curved structure (U-shaped liquid seal) that extends downward, then turns back and extends upward. When it is necessary to cut off the intake of flue gas in the selected air intake branch pipe 142, liquid is injected into the U-shaped liquid seal through the liquid inlet structure provided on the corresponding U-shaped liquid seal. When it is necessary to conduct the intake of flue gas in the selected air intake branch pipe, the liquid in the U-shaped liquid seal is discharged through the liquid drainage structure provided on the U-shaped liquid seal. Obviously, the above-mentioned liquid inlet structure and liquid drainage structure are necessary to achieve the U-shaped liquid seal. In an optional embodiment, a liquid storage tank 143 (generally for storing water) is provided at the top of the catalytic flue gas desulfurization tower. The liquid storage tank 143 is connected to the liquid inlet structure in each air intake branch pipe 142 through a pipeline. Therefore, the liquid inlet structure here can be transformed into a coolant spray device, so that the coolant spray device also serves as the liquid inlet structure. When the coolant spraying device sprays coolant into the flue gas intake passage to cool the flue gas, the liquid in the U-shaped liquid seal is simultaneously discharged through the liquid drainage structure. At this time, the flue gas can still enter the desulfurization reactor through the intake branch pipe 142. Furthermore, the flue gas is cooled by the coolant spraying while passing through the intake branch pipe 142, thereby reducing its temperature and achieving a cooling effect on the catalyst. In another optional embodiment, the liquid storage tank 143 is omitted, and a pipe is directly drawn from the regeneration liquid tank to connect to the liquid inlet structure, thereby using the regeneration liquid as the coolant.

[0184] Generally speaking, the setting condition is to cool the catalyst temperature to ≤80°C, preferably to cool the catalyst temperature to within 30°C higher than the regeneration liquid temperature.

[0185] Figure 25The catalyst washing and regeneration method of the catalytic flue gas desulfurization device shown not only solves the technical problem of catalyst breakage due to the large temperature difference between the front and back by cooling the catalyst and then washing and regenerating it, but also does not consume catalyst cooling gas, and flue gas desulfurization can still be continued during the catalyst cooling process. Therefore, this method has more advantages than the previous method.

[0186] The above describes the relevant contents of this application. Based on these descriptions, a person of ordinary skill in the art will be able to implement this application. Based on the above contents of this specification, all other embodiments obtained by a person of ordinary skill in the art without making any creative efforts should fall within the scope of patent protection.

Claims

1. A catalytic flue gas desulfurization device, comprising a desulfurization reactor having at least one air inlet, at least one exhaust port, at least one liquid discharge port, a catalyst located in the desulfurization reactor, and a spray device for spraying a regeneration liquid for washing and regenerating the catalyst provided on the desulfurization reactor; During desulfurization, the flue gas enters the desulfurization reactor from the air inlet, passes through the catalyst for desulfurization, and is then discharged from the exhaust port. When passing through the catalyst, the sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid. When washing and regenerating the catalyst, the sulfuric acid enters the regeneration liquid sprayed on the catalyst and is then discharged from the drain port. Its characteristics are: The washing and regeneration of the catalyst includes the execution of the following operations: Cutting off the intake of the flue gas, then introducing catalyst cooling gas having a temperature lower than the flue gas temperature during desulfurization into the desulfurization reactor, allowing the catalyst cooling gas to pass through the catalyst and carry away heat in the catalyst before being discharged from the exhaust port; or spraying a coolant into the intake passage of the flue gas to cool the flue gas, then introducing the cooled flue gas into the desulfurization reactor, allowing the cooled flue gas to pass through the catalyst and carry away heat in the catalyst before being discharged from the exhaust port; After the catalyst is cooled to the set condition, the spray device is started to spray the regeneration liquid onto the catalyst through the spray device to wash and regenerate the catalyst and discharge the regeneration liquid from the drain port; The catalyst cooling gas adopts inert gas; the temperature of the catalyst cooling gas is 10℃-80℃; the flow rate of the catalyst cooling gas is ≥ the spray flow rate of the regeneration liquid during washing regeneration and ≤ the flue gas intake flow rate during desulfurization; the set conditions are to cool the catalyst temperature to ≤80℃ and cool the catalyst temperature to within 30℃ higher than the regeneration liquid temperature; water is used as the cooling liquid.

2. The catalytic flue gas desulfurization device according to claim 1, characterized in that: The catalyst cooling gas is introduced into the desulfurization reactor through the flue gas inlet passage.

3. The catalytic flue gas desulfurization device according to claim 1, characterized in that: The catalyst cooling gas is nitrogen; and / or the temperature of the catalyst cooling gas is 15°C-70°C.

4. The catalytic flue gas desulfurization device according to claim 1, characterized in that: Used in a catalytic flue gas desulfurization tower, the catalytic flue gas desulfurization tower performs flue gas desulfurization through the desulfurization reactor and comprises: A vertical row of desulfurization reactors, wherein the vertical row of desulfurization reactors comprises at least two desulfurization reactors vertically arranged and respectively installed on different floors of a frame-type support structure; An air intake network, the air intake network comprising a vertically arranged air intake manifold and air intake branches respectively connected to the air intakes of the desulfurization reactors and located in front of the corresponding desulfurization reactors; an exhaust pipe network, the exhaust pipe network comprising a vertically arranged exhaust main pipe and exhaust branch pipes respectively connected to the exhaust ports of the desulfurization reactors and located above the corresponding desulfurization reactors; and A regeneration liquid circulation system, comprising at least one regeneration liquid tank and a regeneration liquid circulation control pipe network connected between the at least one regeneration liquid tank and each desulfurization reactor, wherein the regeneration liquid circulation control pipe network comprises an output side control pipe network, an input side control pipe network and a regeneration liquid driving device, wherein the output side control pipe network can introduce the regeneration liquid in the selected regeneration liquid tank into the regeneration liquid spraying device of the selected desulfurization reactor, and the input side control pipe network can introduce the regeneration liquid output from the drain port of the selected desulfurization reactor into the selected regeneration liquid tank, and the regeneration liquid driving device can provide the required power to the regeneration liquid; The air intake branch pipe has a first curved structure that extends downward, then bends back, and extends upward. When it is necessary to cut off the intake of smoke in the selected air intake branch pipe, liquid is injected into the corresponding first curved structure through a liquid inlet structure provided on the corresponding first curved structure to form a liquid seal. When it is necessary to conduct the intake of smoke in the selected air intake branch pipe, the liquid in the corresponding first curved structure is discharged through a liquid discharge structure provided on the corresponding first curved structure. The air intake branch pipe is connected to a catalyst cooling gas delivery pipe, and when the air intake of the flue gas in the selected air intake branch pipe is cut off, the catalyst cooling gas can be introduced into the corresponding desulfurization reactor through the catalyst cooling gas delivery pipe; alternatively, a coolant spraying device is provided in the air intake branch pipe, and when the coolant is sprayed into the air intake passage of the flue gas through the coolant spraying device to cool the flue gas, the liquid in the corresponding first curved structure is discharged through the drainage structure.

5. The catalytic flue gas desulfurization device according to claim 4, characterized in that: The output side control pipe network includes an output side main pipe, output side first branches respectively connected between the output side main pipe and a corresponding regeneration liquid tank, and output side second branches respectively connected between the output side main pipe and a corresponding spray device of a desulfurization reactor, each output side first branch is correspondingly provided with an output side first control valve, and the regeneration liquid driving device is connected in series to the output side main pipe; The input side control pipe network includes an input side main pipe, input side first branches respectively connected between the input side main pipe and a corresponding regeneration liquid tank, and input side second branches respectively connected between the input side main pipe and a corresponding discharge port of a desulfurization reactor, and each input side first branch is correspondingly provided with an input side first control valve; The input-side main pipe is arranged from top to bottom, with the upper end of the input-side main pipe connected to the atmospheric environment through a ventilation control valve and the lower end used to connect to the at least one regeneration liquid tank. Each input-side second branch is arranged on the side of the input-side main pipe and has a second curved structure that extends downward, then turns back and extends upward. One end of each input-side second branch is connected to the corresponding drain port and the other end is connected to the wall of the input-side main pipe. When the ventilation control valve is opened to a set state, the input side main pipe is connected to the atmospheric environment and a first pressure environment is formed in the input side main pipe during the washing and regeneration process. The first pressure environment can automatically maintain the regeneration liquid in the second curved structure connected to the input side main pipe so as to form a liquid seal with the second curved structure; When the ventilation control valve is closed to a set state, the input side main pipe is isolated from the atmospheric environment and a second pressure environment is formed in the input side main pipe during the washing and regeneration process. The second pressure environment can automatically draw the regeneration liquid in the second curved structure connected to the input side main pipe into the regeneration liquid tank.

6. The catalytic flue gas desulfurization device according to claim 4, characterized in that: The output side control pipe network includes an output side main pipe, output side first branches respectively connected between the output side main pipe and a corresponding regeneration liquid tank, and output side second branches respectively connected between the output side main pipe and a corresponding spray device of a desulfurization reactor, each output side first branch is correspondingly provided with an output side first control valve, and the regeneration liquid driving device is connected in series to the output side main pipe; The input side control pipe network includes an input side main pipe, input side first branches respectively connected between the input side main pipe and a corresponding regeneration liquid tank, and input side second branches respectively connected between the input side main pipe and a corresponding discharge port of a desulfurization reactor, and each input side first branch is correspondingly provided with an input side first control valve; The input-side main pipe is arranged from top to bottom, with the upper end of the input-side main pipe connected to the atmospheric environment and the lower end used to connect to the at least one regeneration liquid tank. Each input-side second branch is arranged on the side of the input-side main pipe and has a second curved structure that extends downward, then turns back and extends upward. One end of each input-side second branch is connected to the corresponding drain port and the other end is connected to the wall of the input-side main pipe. During desulfurization, liquid is stored in the second curved structure to form a liquid seal. The pipe wall in the liquid seal near the gas-liquid separation surface of the input end of the liquid seal pipe is made of plastic. The strength, chemical stability and thermal deformation temperature of this plastic when used are close to or better than polypropylene PP plastic.

7. The catalytic flue gas desulfurization device according to claim 4, characterized in that: The coolant spraying device also serves as the liquid inlet structure.

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