Catalytic flue gas desulfurization tower

Abstract

The application discloses a catalytic flue gas desulfurization tower, which aims at solving the technical problem that the regeneration liquid tank cannot respond to the emergency discharge demand in time. The catalytic flue gas desulfurization tower comprises a vertical desulfurization reactor, a gas inlet pipe network, a gas outlet pipe network and a regeneration liquid circulation system. The frame support structure and the at least one regeneration liquid tank are a reinforced concrete integrated structure, and the at least one regeneration liquid tank is located at the bottom of the reinforced concrete integrated structure. The reinforced concrete integrated structure further comprises a weir tank located at the side of the at least one regeneration liquid tank. The at least one regeneration liquid tank and the weir tank are connected through an emergency discharge channel which is not normally conducted. When the regeneration liquid tank needs to be discharged in an emergency, the regeneration liquid in the regeneration liquid tank can be discharged into the weir tank through the emergency discharge channel, so that the corresponding time of the emergency discharge is greatly shortened, and the operation difficulty is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas desulfurization, in particular to a catalytic flue gas desulfurization tower. BACKGROUND

[0002] As a known desulfurization technology with application prospect, the basic principle of catalytic flue gas desulfurization technology is that sulfur dioxide, water and oxygen in flue gas are adsorbed on the catalyst and react to generate sulfuric acid under the catalytic action of active components. When the sulfuric acid attached to the catalyst reaches a certain degree, the catalyst can be washed with a regeneration liquid (usually dilute sulfuric acid and / or water) to remove the attached sulfuric acid and release the active sites of the catalyst. The used regeneration liquid can be used as a byproduct (usually dilute sulfuric acid) for further use. Relevant references include: "Current Situation and Trend of Catalytic Flue Gas Desulfurization Technology, China Environmental Science Society 2009 Annual Conference Proceedings, 2009, Huang Pan, et al."

[0003] The patent document with the publication number CN214764545U and the title "Flue gas desulfurization device" disclosed by the applicant of the present application earlier relates to a catalytic flue gas desulfurization tower, which includes a regeneration liquid circulation system, the regeneration liquid circulation system includes a plurality of regeneration liquid tanks (the regeneration liquid tanks are arranged side by side at the bottom of the catalytic flue gas desulfurization tower) and a regeneration liquid circulation control pipe network connected between the plurality of regeneration liquid tanks and each desulfurization reactor, the regeneration liquid circulation control pipe network has an output side control pipe network, an input side control pipe network and a regeneration liquid driving device, the output side control pipe network can guide the regeneration liquid in the selected regeneration liquid tank into the regeneration liquid spraying device of the selected desulfurization reactor, the input side control pipe network can guide the regeneration liquid output by the liquid outlet of the selected desulfurization reactor into the selected regeneration liquid tank, and the regeneration liquid driving device can provide the required power for the regeneration liquid.

[0004] Engineering practice has found that there are still the following technical problems: First, since the regeneration liquid tank actually stores acid liquid, the acid liquid is easy to corrode and leak from the bottom of the regeneration liquid tank during long-term use, and the initial corrosion and leakage is often difficult to be found in time, which exists the risk of environmental pollution and hidden danger of safety risk. Second, when special conditions such as corrosion and leakage of the regeneration liquid tank are found, the acid liquid in the regeneration liquid tank needs to be discharged, and currently a special movable container is used to load the discharged acid liquid, but this way is not timely in emergency response. Third, the regeneration liquid in the regeneration liquid tank will volatilize to produce gas, and the release characteristics of the gas are small and stable, and it is difficult for the existing technical means to accurately monitor the gas emission. Fourth, the regeneration liquid driving device needs to pump the regeneration liquid in the regeneration liquid tank to the desulfurization reactor at a high place, and once the power is lost, the regeneration liquid in the regeneration liquid output side control pipe network will backflow downward to affect the regeneration liquid driving device and other facilities. SUMMARY

[0005] One of the purposes of the present application is to provide a catalytic flue gas desulfurization tower to solve the technical problem of acid corrosion and leakage at the bottom of the regeneration liquid tank. The second purpose of the present application is to provide a catalytic flue gas desulfurization tower to solve the technical problem of not being able to respond to the emergency discharge demand of the regeneration liquid tank in time. The third purpose of the present application is to provide a catalytic flue gas desulfurization tower to solve the technical problem of not easy to monitor the gas emission generated in the regeneration liquid tank. The fourth purpose of the present application is to provide a catalytic flue gas desulfurization tower to solve the technical problem of avoiding the influence of the backflow of the regeneration liquid on the related facilities when the regeneration liquid driving device stops.

[0006] In a first aspect, a catalytic flue gas desulfurization tower is provided for desulfurizing flue gas by a desulfurization reactor having at least one gas inlet, at least one gas outlet, at least one liquid outlet, and a catalyst located in the desulfurization reactor, and a spraying device for spraying a regenerating liquid on the catalyst for washing and regenerating the catalyst; when desulfurizing, flue gas enters the desulfurization reactor from the gas inlet, and then is desulfurized by the catalyst before being discharged from the gas outlet, and sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid when passing through the catalyst, and the sulfuric acid enters the regenerating liquid sprayed on the catalyst before being discharged from the liquid outlet when washing and regenerating the catalyst; the catalytic flue gas desulfurization tower comprises: a desulfurization reactor vertical column, which comprises at least two desulfurization reactors respectively installed on support platforms of different floors of a frame support structure in a vertical arrangement; a gas inlet pipe network, which comprises a vertically arranged gas inlet main pipe and gas inlet branch pipes respectively connecting the gas inlet main pipe and the gas inlets of the desulfurization reactors; a gas outlet pipe network, which comprises a vertically arranged gas outlet main pipe and gas outlet branch pipes respectively connecting the gas outlet main pipe and the gas outlets of the desulfurization reactors; and a regenerating liquid circulation system, which comprises at least one regenerating liquid tank and a regenerating liquid circulation control pipe network connected between the at least one regenerating liquid tank and the desulfurization reactors, the regenerating liquid circulation control pipe network having an output side control pipe network, an input side control pipe network, and a regenerating liquid driving device, the output side control pipe network being capable of guiding the regenerating liquid in a selected regenerating liquid tank to the regenerating liquid spraying device of a selected desulfurization reactor, the input side control pipe network being capable of guiding the regenerating liquid output from the liquid outlet of a selected desulfurization reactor to a selected regenerating liquid tank, and the regenerating liquid driving device being capable of providing the regenerating liquid with required power; the frame support structure and the at least one regenerating liquid tank belong to a reinforced concrete integrated structure, and the at least one regenerating liquid tank is located at the bottom of the reinforced concrete integrated structure; the reinforced concrete integrated structure comprises a sunken room located below the at least one regenerating liquid tank, and the bottom plate of the at least one regenerating liquid tank constitutes the ceiling of the sunken room, and a passage is provided in the side of the sunken room to allow a person to observe the infiltration in the sunken room from the outside of the sunken room or inside the sunken room.

[0007] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the first aspect described above, the reinforced concrete integrated structure further comprises a weir tank located at the side of the sunken room, and the sunken room and the weir tank are connected by a reserved hole provided in the side of the sunken room, and the reserved hole and the weir tank constitute the passage.

[0008] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the first aspect described above, an emergency discharge port is further arranged at the side of the bottom of the at least one regeneration liquid tank, the outlet of the emergency discharge port is located above the weir tank, and a valve is arranged on the emergency discharge port.

[0009] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the first aspect described above, the weir tank comprises a weir tank bottom plate extending horizontally and outwardly from the edge of the bottom plate of the reinforced concrete integrated structure, and a weir tank wall plate extending vertically and upwardly from the outer edge of the weir tank bottom plate.

[0010] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the first aspect described above, the height of the upper surface of the bottom plate of the reinforced concrete integrated structure is higher than the height of the upper surface of the weir tank bottom plate, thereby forming a first step; and the height of the lower surface of the bottom plate of the reinforced concrete integrated structure is higher than the height of the lower surface of the weir tank bottom plate, thereby forming a second step.

[0011] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the first aspect described above, the weir tank is arranged around the outer edge of the at least one regeneration liquid tank, thereby forming an annular cofferdam.

[0012] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the first aspect described above, a cover plate is arranged on the open upper part of the weir tank. The cover plate is preferably an acid-resistant grid plate.

[0013] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the first aspect described above, the regeneration liquid circulation system comprises a plurality of regeneration liquid tanks, and the plurality of regeneration liquid tanks belong to the reinforced concrete integrated structure; a concrete partition plate is arranged between any adjacent regeneration liquid tanks in the plurality of regeneration liquid tanks, and the concrete partition plate extends downwardly to the sunken chamber, thereby dividing the sunken chamber into chamber cavities corresponding to the respective regeneration liquid tanks in the plurality of regeneration liquid tanks, and the side of each chamber cavity is provided with the reserved hole guide.

[0014] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the first aspect described above, the regeneration liquid circulation system comprises a plurality of regeneration liquid tanks, and the plurality of regeneration liquid tanks belong to the reinforced concrete integrated structure; the volume of the weir tank is designed to meet the emptying requirement of any regeneration liquid tank in the plurality of regeneration liquid tanks; an emergency discharge port is arranged at the side of the bottom of each regeneration liquid tank in the plurality of regeneration liquid tanks, the outlet of the emergency discharge port is located above the weir tank, and a valve is arranged on the emergency discharge port.

[0015] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the first aspect described above, the net height of the sink chamber is 800mm-2000mm, preferably 800mm-1500mm, more preferably 1000mm-1200mm; the net width of the weir groove is 1000mm-2000mm, preferably 1000mm-1700mm, more preferably 1000mm-1500mm; the net height of the weir groove is 1000mm-1800mm, preferably 1200mm-1600mm.

[0016] In the catalytic flue gas desulfurization tower of the first aspect described above, when the frame support structure and the at least one regeneration liquid tank are designed as a reinforced concrete integrated structure, a sink chamber is arranged below the at least one regeneration liquid tank in the reinforced concrete integrated structure, and a passage is formed in the side of the sink chamber to allow personnel to enter the inside of the sink chamber from the outside of the sink chamber or the inside of the sink chamber to observe the infiltration in the sink chamber, so that as long as the infiltration in the sink chamber is checked regularly through the passage (for example, whether the ceiling of the sink chamber leaks), the acid liquid corrosion and leakage at the bottom of the regeneration liquid tank can be found in time.

[0017] In a second aspect, a catalytic flue gas desulfurization tower is provided for desulfurizing flue gas by a desulfurization reactor having at least one gas inlet, at least one gas outlet, at least one liquid outlet, and a catalyst located in the desulfurization reactor, and a spraying device for spraying a regenerating liquid on the catalyst for washing and regenerating the catalyst; when desulfurizing, flue gas enters the desulfurization reactor from the gas inlet, and then is desulfurized by the catalyst before being discharged from the gas outlet, and sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid when passing through the catalyst, and the sulfuric acid enters the regenerating liquid sprayed on the catalyst and is discharged from the liquid outlet when washing and regenerating the catalyst; the catalytic flue gas desulfurization tower comprises: a desulfurization reactor vertical column, which comprises at least two desulfurization reactors respectively installed on support platforms of different floors of a frame support structure in a vertical arrangement; a gas inlet pipe network, which comprises a vertically arranged gas inlet main pipe and gas inlet branch pipes respectively connecting the gas inlet main pipe and the gas inlets of the desulfurization reactors; a gas outlet pipe network, which comprises a vertically arranged gas outlet main pipe and gas outlet branch pipes respectively connecting the gas outlet main pipe and the gas outlets of the desulfurization reactors; and a regenerating liquid circulation system, which comprises at least one regenerating liquid tank and a regenerating liquid circulation control pipe network connected between the at least one regenerating liquid tank and the desulfurization reactors, the regenerating liquid circulation control pipe network having an output side control pipe network, an input side control pipe network, and a regenerating liquid driving device, the output side control pipe network being capable of guiding the regenerating liquid in a selected regenerating liquid tank to the regenerating liquid spraying device of a selected desulfurization reactor, the input side control pipe network being capable of guiding the regenerating liquid output from the liquid outlet of a selected desulfurization reactor to a selected regenerating liquid tank, and the regenerating liquid driving device being capable of providing the regenerating liquid with required power; the frame support structure and the at least one regenerating liquid tank belong to a reinforced concrete integrated structure, and the at least one regenerating liquid tank is located at the bottom of the reinforced concrete integrated structure; the reinforced concrete integrated structure further comprises a weir tank located at the side of the at least one regenerating liquid tank, and the at least one regenerating liquid tank and the weir tank are connected through an emergency discharge channel that is normally not open.

[0018] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the second aspect described above, the reinforced concrete integrated structure comprises a sunken room located below the at least one regenerating liquid tank, the bottom plate of the at least one regenerating liquid tank constituting the ceiling of the sunken room, the weir tank being located at the side of the sunken room, and the sunken room and the weir tank being connected through a reserved hole opened in the side of the sunken room.

[0019] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the second aspect described above, the regeneration liquid circulating system comprises a plurality of regeneration liquid tanks, which belong to the reinforced concrete integrated structure; any adjacent regeneration liquid tanks among the plurality of regeneration liquid tanks are provided with a concrete partition plate, which extends downward to the sunken chamber so as to divide the sunken chamber into chamber cavities corresponding to each regeneration liquid tank of the plurality of regeneration liquid tanks, and each chamber cavity is provided with the reserved hole guide.

[0020] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the second aspect described above, the bottom side of the at least one regeneration liquid tank is further provided with an emergency discharge port, the outlet of the emergency discharge port is located above the weir tank, and a valve is installed on the emergency discharge port.

[0021] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the second aspect described above, the weir tank comprises a weir tank bottom plate extending horizontally outward from the edge of the bottom plate of the reinforced concrete integrated structure and a weir tank wall plate extending vertically upward from the outer edge of the weir tank bottom plate.

[0022] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the second aspect described above, the upper surface of the bottom plate of the reinforced concrete integrated structure is higher than the upper surface of the weir tank bottom plate to form a first step; and the lower surface of the bottom plate of the reinforced concrete integrated structure is higher than the lower surface of the weir tank bottom plate to form a second step.

[0023] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the second aspect described above, the weir tank is arranged around the outer edge of the at least one regeneration liquid tank to form an annular cofferdam.

[0024] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the second aspect described above, the upper open part of the weir tank is provided with a cover plate. The cover plate is an acid-resistant grid plate.

[0025] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the second aspect described above, the regeneration liquid circulating system comprises a plurality of regeneration liquid tanks, which belong to the reinforced concrete integrated structure; the volume of the weir tank is designed to meet the emptying requirement of any one of the plurality of regeneration liquid tanks; and the bottom side of each regeneration liquid tank of the plurality of regeneration liquid tanks is provided with an emergency discharge port, the outlet of the emergency discharge port is located above the weir tank, and a valve is installed on the emergency discharge port.

[0026] In the case that the frame support structure and the at least one regeneration liquid tank are designed as a reinforced concrete integrated structure, a weir groove is arranged in the reinforced concrete integrated structure at the side of the at least one regeneration liquid tank, and the at least one regeneration liquid tank is connected with the weir groove through an emergency discharge channel which is normally not conductive. When the regeneration liquid tank needs emergency discharge, the regeneration liquid in the regeneration liquid tank can be discharged into the weir groove through the emergency discharge channel, thus greatly shortening the corresponding time of emergency discharge and greatly reducing the operation difficulty.

[0027] In the third aspect, a catalytic flue gas desulfurization tower is provided, which carries out flue gas desulfurization through a desulfurization reactor, the desulfurization reactor has at least one gas inlet, at least one gas outlet, at least one liquid outlet, and a catalyst arranged in the desulfurization reactor, and a spraying device for spraying regeneration liquid to wash and regenerate the catalyst is arranged on the desulfurization reactor; during desulfurization, flue gas enters the desulfurization reactor from the gas inlet, then passes through the catalyst for desulfurization, and then is discharged from the gas outlet, and sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid when passing through the catalyst, and the sulfuric acid enters the regeneration liquid sprayed on the catalyst and is then discharged from the liquid outlet during washing and regeneration of the catalyst; the catalytic flue gas desulfurization tower comprises: a desulfurization reactor column, which comprises at least two desulfurization reactors respectively arranged in a vertical manner on support platforms on different floors of a frame support structure; a gas inlet pipe network, which comprises a vertically arranged gas inlet main pipe and gas inlet branch pipes respectively connecting the gas inlet main pipe with gas inlets of the desulfurization reactors; a gas outlet pipe network, which comprises a vertically arranged gas outlet main pipe and gas outlet branch pipes respectively connecting the gas outlet main pipe with gas outlets of the desulfurization reactors; and a regeneration liquid circulation system, which comprises at least one regeneration liquid tank and a regeneration liquid circulation control pipe network connected between the at least one regeneration liquid tank and the desulfurization reactors, the regeneration liquid circulation control pipe network has an output side control pipe network, an input side control pipe network, and a regeneration liquid driving device, the output side control pipe network can guide the regeneration liquid in a selected regeneration liquid tank to the regeneration liquid spraying device of a selected desulfurization reactor, the input side control pipe network can guide the regeneration liquid output from the liquid outlet of a selected desulfurization reactor to a selected regeneration liquid tank, and the regeneration liquid driving device can provide the required power for the regeneration liquid; the at least one regeneration liquid tank is of a closed structure and is provided with a top gas discharge channel; and the top gas discharge channel is connected to the gas outlet main pipe through a pipeline.

[0028] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower in the third aspect, the top gas discharge channel is connected to the gas outlet main pipe through a pipeline.

[0029] As a further optimization and / or specialization of the technical solution of the catalytic flue gas desulfurization tower of the third aspect described above, the input side control pipe network comprises an input side main pipe, input side first branches each connected between the input side main pipe and a corresponding one of the regeneration liquid tanks, and input side second branches each connected between the input side main pipe and a corresponding liquid discharge port of the desulfurization reactors, and a first control valve is correspondingly provided on each input side first branch; wherein the input side main pipe is arranged from top to bottom, the upper end of the input side main pipe is connected to the exhaust gas main pipe through a ventilation control valve and a pipeline, and the lower end is used to connect the regeneration liquid tank; the input side second branch is arranged on the side of the input side main pipe and has a curved structure extending downward, turning back and extending upward, one end of the input side second branch is connected to the corresponding liquid discharge 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 in communication with the exhaust gas main pipe and a first pressure environment is formed in the input side main pipe during the washing and regeneration process, and the first pressure environment can automatically maintain the regeneration liquid in the curved structure connected to the input side main pipe to form a liquid seal; when the ventilation control valve is closed to a set state, the input side main pipe is isolated from the exhaust gas main pipe and a second pressure environment is formed in the input side main pipe during the washing and regeneration process, and the second pressure environment can automatically draw the regeneration liquid in the curved structure connected to the input side main pipe into the regeneration liquid tank.

[0030] As a further optimization and / or specialization of the technical solution of the catalytic flue gas desulfurization tower of the third aspect described above, the output side control pipe network comprises: a) a shut-off valve and a check valve arranged in series along the regeneration liquid conveying direction on the output end of the regeneration liquid driving device; and b) a check valve parallel pipe connected to the side of the check valve.

[0031] As a further optimization and / or specialization of the technical solution of the catalytic flue gas desulfurization tower of the third aspect described above, the nominal diameter of the check valve parallel pipe is smaller than the nominal diameter of the check valve.

[0032] As a further optimization and / or specialization of the technical solution of the catalytic flue gas desulfurization tower of the third aspect described above, the output side control pipe network comprises an output side main pipe, output side first branches each connected between the output side main pipe and a corresponding one of the regeneration liquid tanks, and output side second branches each connected between the output side main pipe and a corresponding spraying device of the desulfurization reactors, and an output side first control valve is correspondingly provided on each output side first branch, and the regeneration liquid driving device, the shut-off valve and the check valve are connected in series along the regeneration liquid conveying direction on the output side main pipe.

[0033] The catalytic flue gas desulfurization tower described in the third aspect connects the top exhaust channel to the exhaust network via a pipeline, allowing the gas generated in the regenerated liquid tank to be centrally discharged through the exhaust manifold. Existing technologies enable monitoring of the centralized emissions from the exhaust manifold, overcoming the technical challenge of monitoring emissions from the regenerated liquid tank alone.

[0034] Fourthly, a catalytic flue gas desulfurization tower is provided, which desulfurizes flue gas through a desulfurization reactor. The desulfurization reactor has at least one inlet, at least one outlet, at least one drain outlet, and a catalyst located in the desulfurization reactor. The desulfurization reactor is equipped with a spraying device for washing and regenerating the catalyst. During desulfurization, flue gas enters the desulfurization reactor through the inlet, is desulfurized by the catalyst, and is then discharged from the outlet. When sulfur dioxide in the flue gas passes through the catalyst, it reacts on the catalyst to form sulfuric acid. During the washing and regeneration of the catalyst, the sulfuric acid enters the regenerated liquid sprayed on the catalyst and is discharged from the drain outlet. The tower includes: a vertical row of desulfurization reactors, each row comprising at least two desulfurization reactors arranged vertically and installed on support platforms on different floors of a frame-type support structure; and an inlet pipe network, which includes a vertically arranged main inlet pipe and connections connecting the main inlet pipe to the inlet of each desulfurization reactor. The system includes: intake branch pipes; an exhaust pipe network comprising a vertically arranged exhaust main pipe and exhaust branch pipes connecting the exhaust main pipe to the exhaust ports of each desulfurization reactor; a regenerated liquid circulation system comprising at least one regenerated liquid tank and a regenerated liquid circulation control pipe network connecting the at least one regenerated liquid tank and each desulfurization reactor, the regenerated liquid circulation control pipe network having an output-side control pipe network, an input-side control pipe network, and a regenerated liquid driving device; the output-side control pipe network can guide the regenerated liquid in the selected regenerated liquid tank to the regenerated liquid spray device of the selected desulfurization reactor; the input-side control pipe network can guide the regenerated liquid output from the discharge port of the selected desulfurization reactor to the selected regenerated liquid tank; and the regenerated liquid driving device can provide the required power to the regenerated liquid; the output-side control pipe network includes: a) a shut-off valve and a check valve connected in series along the regenerated liquid conveying direction on the rising main pipe at the output end of the regenerated liquid driving device; and b) a check valve parallel conduit located beside the check valve.

[0035] As a further optimization and / or specification of the technical solution for the catalytic flue gas desulfurization tower in the fourth aspect above, the nominal diameter of the parallel conduit of the check valve is smaller than the nominal diameter of the check valve.

[0036] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the fourth aspect described above, the output side control pipe network comprises an output side main pipe, each output side first branch pipe respectively connected between the output side main pipe and a corresponding regenerative liquid tank, and each output side second branch pipe respectively connected between the output side main pipe and a corresponding spraying device of a desulfurization reactor, and a corresponding output side first control valve is arranged on each output side first branch pipe, and the regenerative liquid driving device, the shut-off valve and the check valve are sequentially connected in series on the output side main pipe in the regenerative liquid conveying direction.

[0037] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the fourth aspect described above, a backflow pipe is connected between the pipe on the output side of the regenerative liquid driving device and the input side main pipe, and a backflow pipe control valve is arranged on the backflow pipe; the shut-off valve, the check valve and the check valve parallel pipe are arranged between the regenerative liquid driving device and the backflow pipe.

[0038] As a further optimization and / or specification of the technical solution of the catalytic flue gas desulfurization tower of the fourth aspect described above, the input side control pipe network comprises an input side main pipe, each input side first branch pipe respectively connected between the input side main pipe and a corresponding regenerative liquid tank, and each input side second branch pipe respectively connected between the input side main pipe and a corresponding liquid outlet of a desulfurization reactor, and a corresponding input side first control valve is arranged on each input side first branch pipe.

[0039] In the catalytic flue gas desulfurization tower of the fourth aspect described above, the shut-off valve and the check valve are sequentially connected in series on the output end of the regenerative liquid driving device in the regenerative liquid conveying direction, and the check valve parallel pipe is arranged on the side of the check valve, so that when the regenerative liquid driving device is stopped, the check valve effectively prevents the backflow of regenerative liquid, and at the same time, because the check valve parallel pipe is arranged in parallel with the check valve, the impact of the backflow regenerative liquid on the check valve is reduced, and the service life of the check valve is improved. The shut-off valve has two main functions here, the first is to close the shut-off valve when the regenerative liquid driving device is stopped to prevent the water hammer effect from causing the impeller of the regenerative liquid driving device to reverse, thereby protecting the regenerative liquid driving device; the second is to adjust the closing amount to achieve pressure build-up when necessary, thereby improving the lift that can be achieved by the regenerative liquid driving device.

[0040] The application will be further described below in conjunction with the drawings and specific embodiments. Additional aspects and advantages of the application will be partially given in the following description, partially become apparent from the following description, or be understood by practice. BRIEF DESCRIPTION OF DRAWINGS

[0041] The drawings constituting a part of this specification aid in the understanding of the present application, and together with its related description, serve to explain the present application, but do not constitute an undue limitation on the same. In the drawings:

[0042] Figure 1 A plan view of a plurality of regeneration liquid tanks in a catalytic flue gas desulfurization tower according to an embodiment of the present application.

[0043] Figure 2 A plan view of a plurality of regeneration liquid tanks in a catalytic flue gas desulfurization tower according to an embodiment of the present application. Figure 1 A sectional view along A-A in FIG. 4.

[0044] Figure 3 A plan view of a plurality of regeneration liquid tanks in a catalytic flue gas desulfurization tower according to an embodiment of the present application. Figure 1 A sectional view along B-B in FIG. 4.

[0045] Figure 4 A plan view of a plurality of regeneration liquid tanks in a catalytic flue gas desulfurization tower according to an embodiment of the present application. DETAILED DESCRIPTION

[0046] The present application will be described in detail below with reference to the drawings. Those skilled in the art will be able to implement the present application based on these descriptions. Before the present application is disclosed in detail, it is important to note that the present application is not limited in scope to the particular embodiments described herein, but will cover all changes, modifications, alternatives, and equivalents thereof.

[0047] The technical solutions and technical features provided in each part including the following description can be combined with each other without conflict. In addition, in the case of possibility, these technical solutions, technical features and related combinations can be given a specific technical subject and protected by a related patent.

[0048] The embodiments of the present application involved in the following description are usually only a part of the embodiments and not all the embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of patent protection.

[0049] The terms "include", "contain" and any variations thereof in the specification and corresponding claims and related parts are intended to cover non-exclusive inclusion. Other related terms and units can be reasonably interpreted based on the related content provided in the specification.

[0050] The catalytic flue gas desulfurization tower of the embodiment of the present application carries out flue gas desulfurization through a desulfurization reactor, the desulfurization reactor has at least one gas inlet, at least one gas outlet, at least one liquid outlet, and a catalyst located in the desulfurization reactor, and a spraying device for regenerating liquid for washing the catalyst is arranged on the desulfurization reactor. When desulfurization, flue gas enters the desulfurization reactor from the gas inlet, then desulfurization through the catalyst, and then discharged from the gas outlet, sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid when passing through the catalyst, and the sulfuric acid enters the regenerating liquid sprayed on the catalyst and then discharged from the liquid outlet when the catalyst is washed and regenerated.

[0051] In addition, the catalytic flue gas desulfurization tower specifically includes: a desulfurization reactor vertical column, the desulfurization reactor vertical column includes at least two desulfurization reactors respectively installed on different floors of the frame support structure in a vertical arrangement; a gas inlet pipe network, the gas inlet pipe network includes a vertically arranged gas inlet main pipe and each gas inlet branch pipe connecting the gas inlet main pipe and the gas inlet of each desulfurization reactor; an exhaust pipe network, the exhaust pipe network includes a vertically arranged exhaust main pipe and each exhaust branch pipe connecting the exhaust main pipe and the exhaust port of each desulfurization reactor; a regenerating liquid circulation system, the regenerating liquid circulation system includes a plurality of regenerating liquid tanks and a regenerating liquid circulation control pipe network connected between the plurality of regenerating liquid tanks and each desulfurization reactor, the regenerating liquid circulation control pipe network has an output side control pipe network, an input side control pipe network and a regenerating liquid driving device, the output side control pipe network can guide the regenerating liquid in the selected regenerating liquid tank to the regenerating liquid spraying device of the selected desulfurization reactor, the input side control pipe network can guide the regenerating liquid output by the liquid outlet of the selected desulfurization reactor to the selected regenerating liquid tank, and the regenerating liquid driving device can provide the regenerating liquid with the required power.

[0052] The specific structure and working principle of the catalytic flue gas desulfurization tower can be referred to the patent document with publication number CN214764545U and the name "flue gas desulfurization device".

[0053] Figure 1 A top view of the plurality of regenerating liquid tanks in the catalytic flue gas desulfurization tower of the embodiment of the present application. Figure 2 A Figure 1 A cross-sectional view in A-A direction. Figure 3 A Figure 1 A cross-sectional view in B-B direction. As Figures 1-3As shown, the frame support structure 11 and the plurality of regeneration liquid tanks 12 (specifically five regeneration liquid tanks 12) of the catalytic flue gas desulfurization tower described above belong to a reinforced concrete integrated structure 1, in addition, the reinforced concrete integrated structure 1 also includes a sinking chamber 13 located below the plurality of regeneration liquid tanks 12 and a weir groove 14 located at the side of the sinking chamber 13, the sinking chamber 13 and the weir groove 14 are communicated through the reserved hole 131 opened in the side of the sinking chamber 13, and the adjacent regeneration liquid tanks 12 among the plurality of regeneration liquid tanks 12 are provided with a concrete partition plate 121, the concrete partition plate 121 extends downward to the sinking chamber 13 so that the sinking chamber 13 is divided into chamber cavities corresponding to each regeneration liquid tank 12 among the plurality of regeneration liquid tanks 12, the side of each chamber cavity is provided with the reserved hole 131, and the ceiling of each chamber cavity is the bottom plate of the corresponding regeneration liquid tank 12, the weir groove 14 is arranged around the outer side edge of the regeneration liquid tank 12 to form an annular cofferdam, and the staff can probe into each reserved hole 131 from the upper opening of the annular cofferdam to observe the infiltration in each chamber cavity, for example, whether the ceiling of each chamber cavity leaks, in addition, the bottom side of each regeneration liquid tank 12 among the plurality of regeneration liquid tanks 12 is provided with an emergency discharge port 122, the outlet of the emergency discharge port 122 is located above the weir groove 14, and a valve (not shown in the figure) is installed on the emergency discharge port.

[0054] The advantage of the above embodiment is that as long as the infiltration in the sinking chamber 13 (for example, whether the ceiling of the sinking chamber 13 leaks) is checked through the channel regularly, the acid liquid corrosion and leakage at the bottom of the regeneration liquid tank 12 can be found in time. In addition, when the regeneration liquid in the regeneration liquid tank 12 needs to be discharged in an emergency, the regeneration liquid in the regeneration liquid tank 12 can be discharged into the weir groove 14 through the emergency discharge port 122, which greatly shortens the corresponding time of emergency discharge and greatly reduces the operation difficulty. If large-scale leakage occurs at the bottom of the regeneration liquid tank 12, the weir groove 14 also plays a role in storing the regeneration liquid (acid liquid), avoiding environmental pollution caused by the infiltration of the regeneration liquid into the ground.

[0055] Specifically, the weir groove 14 includes a weir groove bottom plate 141 extending horizontally and outwardly from the edge of the bottom plate 15 of the reinforced concrete integrated structure 1 and a weir groove wall plate 142 extending vertically and upwardly from the outer side edge of the weir groove bottom plate 141. Among them, the height of the upper surface of the bottom plate 15 of the reinforced concrete integrated structure 1 is higher than the height of the upper surface of the weir groove bottom plate 141 to form a first step (as shown in Figure 2 or Figure 3 The height of the lower surface of the bottom plate 15 of the reinforced concrete integrated structure 1 is higher than the height of the lower surface of the weir groove bottom plate 141 to form a second step (as shown in Figure 2 or Figure 3The first step can avoid the rainwater gathered in the weir groove 14 from entering the sunken chamber 13, thereby avoiding the interference to the judgment of whether the sunken chamber 13 is leaked. The second step can increase the stability of the reinforced concrete integrated structure 1, and can also distribute the weight of the reinforced concrete integrated structure 1 on the weir groove bottom plate 141, thereby further enhancing the stability of the catalytic flue gas desulfurization tower.

[0056] As shown in Figure 1 An acid-proof grid plate is installed on the upper opening of the weir groove, thereby playing a role of personnel safety protection.

[0057] In the above embodiment, the clear height of the sunken chamber is 800mm-2000mm, preferably 800mm-1500mm, and more preferably 1000mm-1200mm; the clear width of the weir groove is 1000mm-2000mm, preferably 1000mm-1700mm, and more preferably 1000mm-1500mm; and the clear height of the weir groove is 1000mm-1800mm, preferably 1200mm-1600mm.

[0058] Figure 4 It is a schematic diagram of the structure principle of a catalytic flue gas desulfurization tower according to an embodiment of the present application. As shown in Figure 4 A catalytic flue gas desulfurization tower, which carries out flue gas desulfurization through a desulfurization reactor 2, has at least one gas inlet, at least one gas outlet, at least one liquid outlet, a catalyst 21 in the desulfurization reactor 2, and a spraying device for spraying a regeneration liquid for washing and regenerating the catalyst on the desulfurization reactor. When desulfurization is carried out, flue gas enters the desulfurization reactor from the gas inlet, and then is discharged from the gas outlet after desulfurization by the catalyst. 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 then discharged from the liquid outlet.

[0059] Further, the flue gas desulfurization tower by the catalytic method comprises: a vertical column of desulfurization reactors, which comprises at least two desulfurization reactors 2 arranged vertically on different floors of a frame support structure; a gas inlet pipe network 3, which comprises a vertical gas inlet main pipe and gas inlet branch pipes connecting the gas inlet main pipe with the gas inlets of the desulfurization reactors; a gas outlet pipe network 4, which comprises a vertical gas outlet main pipe and gas outlet branch pipes connecting the gas outlet main pipe with the gas outlets of the desulfurization reactors; and a regeneration liquid circulation system, which comprises a plurality of regeneration liquid tanks 12 and a regeneration liquid circulation control pipe network 5 connecting the regeneration liquid tanks 12 and the desulfurization reactors 2, wherein the regeneration liquid circulation control pipe network 5 comprises an output side control pipe network 51, an input side control pipe network 52 and a regeneration liquid driving device 53, the output side control pipe network 51 is configured to guide the regeneration liquid in the selected regeneration liquid tank to the regeneration liquid spraying device of the selected desulfurization reactor, the input side control pipe network 52 is configured to guide the regeneration liquid output by the liquid outlet of the selected desulfurization reactor to the selected regeneration liquid tank, and the regeneration liquid driving device 53 is configured to provide the required power for the regeneration liquid.

[0060] The plurality of regeneration liquid tanks 12 are of a closed structure and are provided with a top gas outlet passage 16.

[0061] Specifically, the plurality of regeneration liquid tanks 12 are provided with a top cover, and the concrete partition plate 121 of the regeneration liquid tank 12 is spaced apart from the top cover at a distance below the top cover, so that the tops of the plurality of regeneration liquid tanks 12 are communicated, and the gas outlet passage 16 is arranged on the top cover.

[0062] Specifically, the top gas outlet passage 16 is connected to the gas outlet main pipe by a pipeline, thereby avoiding affecting the gas outlet branch pipes.

[0063] By connecting the top gas outlet passage to the gas outlet pipe network by a pipeline, the gas generated in the regeneration liquid tank is finally discharged through the gas outlet main pipe. The centralized discharge of the gas outlet main pipe can be monitored by existing technical means, thereby overcoming the technical problem that it is not easy to monitor the discharge of the gas generated in the regeneration liquid tank.

[0064] Further, the input side control pipe network 52 comprises an input side main pipe 521, input side first branch pipes 522 each connected between the input side main pipe 521 and a corresponding one of the regeneration liquid tanks 12, and input side second branch pipes 523 each connected between the input side main pipe 521 and a corresponding one of the liquid discharge ports of the desulfurization reactors 2, and a corresponding one of the input side first branch pipes 522 is provided with an input side first control valve.

[0065] When the vent control valve 524 is closed to a set state, the input side main pipe is isolated from the exhaust main pipe, at this time, due to the flow of the regeneration liquid during the regeneration of the scrubbing, the gas in the input side main pipe is carried away, a negative pressure is formed in the input side main pipe, and thus the regeneration liquid in the curved structure connected to the input side main pipe is automatically drawn into the regeneration liquid tank. When the vent control valve 524 is opened to a set state, the vent control valve 524 plays a role of breaking the vacuum, and thus the regeneration liquid in the curved structure connected to the input side main pipe can be maintained to form a liquid seal of the curved structure.

[0066] Since the vent control valve 524 is connected to the exhaust main pipe through a pipe, the gas discharged from the vent control valve 524 is still discharged through the exhaust main pipe.

[0067] Further, the output side control pipe network 51 comprises an output side main pipe, output side first branch pipes each connected between the output side main pipe and a corresponding one of the regeneration liquid tanks, and output side second branch pipes each connected between the output side main pipe and a corresponding one of the spray devices of the desulfurization reactors, and a corresponding one of the output side first branch pipes is provided with an output side first control valve.

[0068] The output side control pipe network further comprises: a) a shut-off valve 511 and a check valve 512 arranged in series along the direction of the regenerative liquid in the ascending main pipe at the output end of the regenerative liquid driving device 53, and b) a check valve parallel pipe 513 arranged beside the check valve 512.

[0069] The nominal diameter of the check valve parallel pipe 513 is smaller than the nominal diameter of the check valve 512.

[0070] The shut-off valve and the check valve are arranged in series along the direction of the regenerative liquid in the ascending main pipe at the output end of the regenerative liquid driving device, and the check valve parallel pipe is arranged beside the check valve. When the regenerative liquid driving device is stopped, the check valve effectively prevents the backflow of the regenerative liquid. At the same time, because the check valve parallel pipe is arranged beside the check valve, and the check valve parallel pipe is arranged in parallel with the check valve, the impact of the backflowing regenerative liquid on the check valve is reduced, and the service life of the check valve is improved. The shut-off valve has two main functions. First, when the regenerative liquid driving device is stopped, the shut-off valve is closed to prevent the impeller of the regenerative liquid driving device from reversing due to water hammer effect, thereby protecting the regenerative liquid driving device. Second, the shut-off valve can be adjusted to achieve pressure build-up in the case of need, thereby improving the lift that can be achieved by the regenerative liquid driving device.

[0071] The above describes the relevant content of the present application. Those skilled in the art can implement the present application based on the above description. Based on the above description of the present application, all other embodiments obtained by those skilled in the art without creative labor shall fall within the scope of the present application.

Claims

1. A catalytic flue gas desulfurization tower for flue gas desulfurization by a desulfurization reactor, the desulfurization reactor having at least one gas inlet, at least one gas outlet, at least one liquid outlet, a catalyst in the desulfurization reactor, and a spraying device for spraying a regenerating liquid on the catalyst for washing and regenerating the catalyst; flue gas enters the desulfurization reactor from the gas inlet, is desulfurized by the catalyst, and is then discharged from the gas outlet, sulfur dioxide in the flue gas reacts with the catalyst to form sulfuric acid when passing through the catalyst, and the sulfuric acid is discharged from the liquid outlet after being sprayed on the catalyst by the regenerating liquid; it comprises: a desulfurization reactor vertical column comprising at least two desulfurization reactors respectively installed on support platforms of different floors of a frame support structure in a vertical arrangement; a gas inlet pipe network comprising a vertically arranged gas inlet main pipe and gas inlet branch pipes connecting the gas inlet main pipe with the gas inlets of the desulfurization reactors respectively; a gas outlet pipe network comprising a vertically arranged gas outlet main pipe and gas outlet branch pipes connecting the gas outlet main pipe with the gas outlets of the desulfurization reactors respectively; a regenerating liquid circulation system comprising at least one regenerating liquid tank and a regenerating liquid circulation control pipe network connected between the at least one regenerating liquid tank and the desulfurization reactors, the regenerating liquid circulation control pipe network having an output side control pipe network for guiding the regenerating liquid in a selected regenerating liquid tank to the regenerating liquid spraying device of a selected desulfurization reactor, an input side control pipe network for guiding the regenerating liquid output from the liquid outlet of a selected desulfurization reactor to a selected regenerating liquid tank, and a regenerating liquid driving device for providing the regenerating liquid with required power; characterized in that: the frame support structure and the at least one regenerating liquid tank belong to a reinforced concrete integrated structure, and the at least one regenerating liquid tank is located at the bottom of the reinforced concrete integrated structure; the reinforced concrete integrated structure further comprises a weir tank located at the side of the at least one regenerating liquid tank, and the at least one regenerating liquid tank is connected with the weir tank through an emergency discharge channel which is normally not open; the reinforced concrete integrated structure comprises a sunken room located below the at least one regenerating liquid tank, the bottom plate of the at least one regenerating liquid tank constitutes the ceiling of the sunken room, the weir tank is located at the side of the sunken room, and the sunken room is connected with the weir tank through a reserved hole opened in the side of the sunken room; the regenerating liquid circulation system comprises a plurality of regenerating liquid tanks, and the plurality of regenerating liquid tanks belong to the reinforced concrete integrated structure; any adjacent regenerating liquid tanks among the plurality of regenerating liquid tanks are provided with a concrete partition plate which extends downward to the sunken room so that the sunken room is divided into chamber cavities corresponding to the regenerating liquid tanks respectively, and the side of each chamber cavity is provided with the reserved hole.

2. The catalytic flue gas desulphurization tower as claimed in claim 1, wherein: An emergency discharge port is also formed at the side of the bottom of the at least one regeneration liquid tank, and the outlet of the emergency discharge port is above the weir tank.

3. The catalytic flue gas desulfurization tower of claim 1, wherein: The weir tank comprises a weir tank bottom plate extending horizontally and outwardly from the edge of the bottom plate of the reinforced concrete integrated structure, and a weir tank wall plate extending vertically and upwardly from the outer edge of the weir tank bottom plate.

4. The catalytic flue gas desulfurization tower according to claim 3, wherein: The upper surface of the bottom plate of the reinforced concrete integrated structure is higher than the upper surface of the weir tank bottom plate to form a first step, and the lower surface of the bottom plate of the reinforced concrete integrated structure is higher than the lower surface of the weir tank bottom plate to form a second step.

5. The catalytic flue gas desulfurization tower according to claim 1, wherein: The weir tank is arranged around the outer edge of the at least one regeneration liquid tank to form an annular weir.

6. The catalytic flue gas desulfurization tower of claim 1, wherein: A cover plate is arranged on the upper opening of the weir tank.

7. The catalytic flue gas desulfurization tower of claim 6, wherein: The cover plate is an acid-proof grating plate.

8. The catalytic flue gas desulfurization tower of claim 1, wherein: The regeneration liquid circulation system comprises a plurality of regeneration liquid tanks, which belong to the reinforced concrete integrated structure; the volume of the weir tank is designed to meet the emptying requirement of any one of the plurality of regeneration liquid tanks; an emergency discharge port is formed at the side of the bottom of each regeneration liquid tank, and the outlet of the emergency discharge port is above the weir tank; a valve is arranged on the emergency discharge port.

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