Hydrolysis device and blast furnace gas desulfurization system

Abstract

The utility model belongs to industrial tail gas purification technical field, concretely relates to a hydrolytic device and blast furnace gas desulfurization system. The hydrolytic device includes: dust removal subassembly is connected with blast furnace, the excess pressure power generation system is connected with dust removal subassembly, the coal gas dehydrator is connected with the excess pressure power generation system, the composite hydrolytic tower is connected with the coal gas dehydrator, the pressure reducing valve group is connected with dust removal subassembly and the coal gas dehydration tower.

Description

Technical Field

[0001] This application belongs to the field of industrial exhaust gas purification technology, specifically relating to a hydrolysis device and a blast furnace gas desulfurization system. Background Technology

[0002] Blast furnace gas is a high-temperature, high-pressure, flammable, explosive, and toxic gas with a high organic sulfur content. Current desulfurization technologies mainly include source control and end-of-pipe treatment after combustion. In production, downstream users of blast furnace gas are distributed across various areas of the steel plant, resulting in numerous locations. Coupled with site constraints, conventional end-of-pipe treatment methods suffer from problems such as numerous treatment points, high investment, and large land area requirements. Therefore, implementing source control and precise desulfurization of blast furnace gas is undoubtedly a more efficient and economical technical approach.

[0003] The current mainstream process for fine desulfurization of blast furnace gas is hydrolysis and subsequent treatment. However, the hydrolysis process is often placed before the waste pressure power generation system, which causes pressure and energy losses and affects the capacity of the waste pressure power generation system. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a hydrolysis device and a blast furnace gas desulfurization system, aiming to at least partially solve the technical problem that the hydrolysis process is often set before the waste pressure power generation system, which causes pressure and energy losses and affects the capacity of the waste pressure power generation system.

[0005] The technical solution of this utility model is as follows:

[0006] A hydrolysis device includes: a dust removal component connected to a blast furnace; a residual pressure power generation system connected to the dust removal component; a gas dehydrator connected to the residual pressure power generation system; a composite hydrolysis tower connected to the gas dehydrator; and a pressure reducing valve group connected to the dust removal component and the gas dehydration tower.

[0007] In some embodiments, the dust removal assembly includes: a gravity dust collector connected to the blast furnace; a chlorine powder removal device connected to the gravity dust collector; and a bag filter connected to the chlorine powder removal device and connected to the pressure reducing valve assembly and the residual pressure power generation system.

[0008] In some embodiments, the chlorine removal powder equipment includes: a mixing drum connected to the gravity dust collector and the bag filter; a nozzle disposed inside the mixing drum; and a chlorine removal powder preparer connected to the nozzle.

[0009] In some implementations, the dechlorination powder equipment further includes: a first connecting pipe, one end of which is connected to the nozzle and the other end of which is connected to the dechlorination powder preparer; a control valve located in the first connecting pipe; and a check valve located in the first connecting pipe.

[0010] In some embodiments, the hydrolysis device further includes: a second connecting pipe, one end of which is connected to the pressure reducing valve group and the residual pressure power generation system, and the other end of which is connected to the gas dehydration tower; a third connecting pipe, which is connected to the gas outlet of the composite hydrolysis tower; a fourth connecting pipe, which is connected to the second connecting pipe and the third connecting pipe; and a regulating valve located on the fourth connecting pipe.

[0011] In some embodiments, the second connecting pipe is provided with a first shut-off valve and a first spectacle valve; wherein the first shut-off valve and the first spectacle valve are located between the fourth connecting pipe and the gas dehydrator.

[0012] In some implementations, the third connecting pipe is provided with a second shut-off valve and a second spectacle valve.

[0013] In some embodiments, the hydrolysis device further includes: a venting pipe connected to the gas outlet of the composite hydrolysis tower; a venting valve located on the venting pipe; and a third shut-off valve located on the venting pipe.

[0014] In some embodiments, the hydrolysis device further includes a gas temperature regulator connected to the gas dehydrator and the composite hydrolysis tower.

[0015] Based on the same inventive concept, this application also provides a blast furnace gas desulfurization system, including the aforementioned hydrolysis device.

[0016] The beneficial effects of this utility model include at least the following:

[0017] Because the dust removal system is connected to the blast furnace, the blast furnace gas produced during blast furnace production enters the dust removal system for dust removal. Since the waste pressure power generation system is also connected to the dust removal system, the dust-removed blast furnace gas enters the waste pressure power generation system to generate electricity. Because the gas dehydrator is connected to the waste pressure power generation system, the blast furnace gas, after performing work on the waste pressure power generation system, enters the gas dehydrator to remove mechanical water. Since the composite hydrolysis tower is connected to the gas dehydrator, the blast furnace gas, after mechanical water removal, enters the composite hydrolysis tower, where harmful gas components in the blast furnace gas are adsorbed and hydrolyzed before entering the downstream desulfurization process.

[0018] Since the residual pressure power generation system is set before the gas dehydrator and the composite hydrolysis tower, it can reduce the waste of heat and pressure and make better use of the residual pressure and temperature of the blast furnace gas for power generation.

[0019] Since the pressure reducing valve group is connected to the dust removal components and the gas dehydration tower, when the residual pressure power generation system is under maintenance, the pressure reducing valve group is opened, and the dust-removed blast furnace gas enters the pressure reducing valve group and is depressurized. The depressurized blast furnace gas then enters the gas dehydrator, so that the blast furnace gas no longer passes through the residual pressure power generation system, and the staff can carry out normal maintenance on the residual pressure power generation system. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a hydrolysis apparatus according to some embodiments.

[0022] In the attached image:

[0023] Dust removal assembly 10, gravity dust collector 11, chlorine removal powder equipment 12, mixing cylinder 121, chlorine removal powder preparer 122, first connecting pipe 123, control valve 124, check valve 125, nozzle 126; bag filter 13; residual pressure power generation system 20; gas dehydrator 30; composite hydrolysis tower 40; pressure reducing valve group 50; blast furnace 60; second connecting pipe 70; fourth connecting pipe 80; regulating valve 90; first shut-off valve 100; first spectacle valve 110; third connecting pipe 120; second shut-off valve 130; second spectacle valve 140; fifth connecting pipe 150; sixth connecting pipe 160; vent pipe 170; vent valve 180; third shut-off valve 190; gas temperature regulator 200. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that all directional indications in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0028] This application is described below with reference to the accompanying drawings and specific embodiments:

[0029] The hydrolysis device provided in this embodiment aims to at least partially solve the technical problem that the hydrolysis process is often set before the waste pressure power generation system, which causes pressure and energy loss and affects the capacity of the waste pressure power generation system.

[0030] Figure 1 This is a schematic diagram of the hydrolysis apparatus according to some embodiments. (In conjunction with...) Figure 1 The hydrolysis device in this embodiment includes: a dust removal assembly 10, a residual pressure power generation system 20, a gas dehydrator 30, a composite hydrolysis tower 40, and a pressure reducing valve assembly 50. The dust removal assembly 10 is connected to the blast furnace 60. The residual pressure power generation system 20 is connected to the dust removal assembly. The gas dehydrator 30 is connected to the residual pressure power generation system 20. The composite hydrolysis tower 40 is connected to the gas dehydrator 30. The pressure reducing valve assembly 50 is connected to both the dust removal assembly and the gas dehydrator tower.

[0031] The waste pressure power generation system 20 is a TRT (Blast Furnace Top Gas Recovery Turbine Unit).

[0032] Since the dust removal assembly 10 is connected to the blast furnace 60, the blast furnace gas generated during the blast furnace 60 production process enters the dust removal assembly 10 for dust removal. Since the waste pressure power generation system 20 is connected to the dust removal assembly, the dust-removed blast furnace gas enters the waste pressure power generation system 20 to generate electricity. Since the gas dehydrator 30 is connected to the waste pressure power generation system 20, the blast furnace gas after performing work on the waste pressure power generation system 20 enters the gas dehydrator 30 to remove mechanical water. Since the composite hydrolysis tower 40 is connected to the gas dehydrator 30, the blast furnace gas after mechanical water removal enters the composite hydrolysis tower 40 to adsorb and hydrolyze harmful gas components in the blast furnace gas before entering the downstream desulfurization process.

[0033] Since the residual pressure power generation system 20 is set before the gas dehydrator 30 and the composite hydrolysis tower 40, the waste of heat and pressure can be reduced, and the residual pressure and temperature of the blast furnace gas can be better utilized for power generation.

[0034] Since the pressure reducing valve group 50 is connected to the dust removal components and the gas dehydration tower, when the residual pressure power generation system 20 is under maintenance, the pressure reducing valve group 50 is opened, and the dust-removed blast furnace gas enters the pressure reducing valve group 50 and is depressurized. The depressurized blast furnace gas then enters the gas dehydrator 30, so that the blast furnace gas no longer passes through the residual pressure power generation system 20, and the staff can carry out normal maintenance on the residual pressure power generation system 20.

[0035] In some embodiments, along the axial direction of the composite hydrolysis tower 40, the composite hydrolysis tower 40 is provided with, from bottom to top, an airflow distribution plate, a harmful gas component re-adsorption layer, and a two-stage hydrolysant layer to adsorb and hydrolyze harmful gases. A dechlorination packing layer is provided at the bottom of the composite hydrolysis tower 30 to re-adsorb chlorides in the blast furnace gas, achieving a dechlorination effect.

[0036] Combination Figure 1 In some embodiments, to achieve dust removal, the dust removal assembly 10 includes a gravity dust collector 11, a chlorine powder removal device 12, and a bag filter 13. The gravity dust collector 11 is connected to the blast furnace 60. The chlorine powder removal device 12 is connected to the gravity dust collector 11. The bag filter 13 is connected to the chlorine powder removal device 12 and is also connected to the pressure reducing valve assembly 50 and the residual pressure power generation system 20.

[0037] During the production process of blast furnace 60, the blast furnace gas enters the gravity dust collector 11 for coarse dust removal, and then enters the dechlorination powder equipment 12. In the dechlorination powder equipment 12, the blast furnace gas mixes and reacts with the dechlorination powder to form chlorine-containing dust particles. Subsequently, the chlorine-containing dust particles in the blast furnace gas are filtered in the bag filter 13, thus removing the chloride present in the blast furnace gas. This prevents the chlorine-containing dust particles from entering the residual pressure power generation system 20 or the pressure reducing valve group 50, avoiding corrosion of the residual pressure power generation system 20 or the pressure reducing valve group 50 by chloride, which would affect the service life of the residual pressure power generation system 20 or the pressure reducing valve group 50. At the same time, it can reduce the toxic effect of chloride on the hydrolysis agent layer in the composite hydrolysis tower 40, ensuring the service life of the composite hydrolysis tower 40.

[0038] Combination Figure 1 In some embodiments, to remove chlorine from blast furnace gas, the chlorine removal powder device 12 includes: a mixing cylinder 121, a chlorine removal powder preparer 122, and a nozzle 126. The mixing cylinder 121 is connected to a gravity dust collector 11 and a bag filter 13. The nozzle 126 is disposed inside the mixing cylinder 121. The chlorine removal powder preparer 122 is connected to the nozzle 126.

[0039] The dechlorination powder generated by the dechlorination powder generator 122 is sprayed into the mixing cylinder 121 through the nozzle 126. The blast furnace gas after coarse dust removal by the gravity dust collector 11 enters the mixing cylinder 121 to fully mix and react with the dechlorination powder to form chlorine-containing dust particles, which then enter the bag filter 13 to filter the chlorine-containing dust particles in the blast furnace gas.

[0040] Combination Figure 1 In some embodiments, to supply dechlorination powder into the mixing cylinder 121, the dechlorination powder device 12 further includes a first connecting pipe 123 and a control valve 124. One end of the first connecting pipe 123 is connected to the nozzle 126, and the other end is connected to the dechlorination powder preparer 122. The control valve 124 is located in the first connecting pipe 123.

[0041] When dechlorination powder is to be supplied to the mixing cylinder 121, the control valve 124 is opened, and the dechlorination powder generated by the dechlorination powder generator 122 reaches the nozzle 126 through the first connecting pipe 123 and is sprayed into the mixing cylinder 121 through the nozzle 126.

[0042] Combination Figure 1 In some embodiments, the first connecting pipe 123 is provided with a check valve 125 to prevent the dechlorination powder from returning to the dechlorination powder generator 122, ensuring that the dechlorination powder can smoothly reach the nozzle 126.

[0043] Combination Figure 1In some embodiments, to ensure safety in the event of a malfunction in at least one of the gas dehydrator 30 and the composite hydrolysis tower 40, the hydrolysis device further includes: a second connecting pipe 70, a third connecting pipe 120, a fourth connecting pipe 80, and a regulating valve 90. One end of the second connecting pipe 70 is connected to the pressure reducing valve assembly 50 and the residual pressure power generation system 20, and the other end is connected to the gas dehydrator 30. The third connecting pipe 120 is connected to the gas outlet of the composite hydrolysis tower 40. The fourth connecting pipe 80 is connected to both the second connecting pipe 70 and the third connecting pipe 120. The regulating valve 90 is located on the fourth connecting pipe 80.

[0044] When the gas dehydrator 30 and the composite hydrolysis tower 40 are operating normally, the regulating valve 90 is closed, and the blast furnace gas passing through the pressure reducing valve group 50 enters the gas dehydrator 30 through the second connecting pipe 70, or the blast furnace gas passing through the residual pressure power generation system 20 enters the gas dehydrator 30 through the second connecting pipe 70. When maintenance is required on at least one of the gas dehydrator 30 and the composite hydrolysis tower 40, the regulating valve 90 is opened, and the blast furnace gas passing through the pressure reducing valve group 50 enters the fourth connecting pipe 80 through the second connecting pipe 70, or the blast furnace gas passing through the residual pressure power generation system 20 enters the fourth connecting pipe 80 through the second connecting pipe 70. The blast furnace gas is then transported to the third connecting pipe 120 through the fourth connecting pipe 80, and finally to the downstream desulfurization process through the third connecting pipe 120, to ensure the safety of maintenance personnel.

[0045] Combination Figure 1 In some embodiments, when maintenance is required on at least one of the gas dehydrator 30 and the composite hydrolysis tower 40, a first shut-off valve 100 and a first spectacle valve 110 are provided in the second connecting pipe 70 to prevent blast furnace gas from reaching the gas dehydrator 30. The first shut-off valve 100 and the first spectacle valve 110 are located between the fourth connecting pipe 80 and the gas dehydrator 30.

[0046] When maintenance is required on at least one of the gas dehydrator 30 and the composite hydrolysis tower 40, the first shut-off valve 100 and the first spectacle valve 110 are closed to disconnect the connection between the second connecting pipe 70 and the gas dehydrator 30, ensuring that blast furnace gas only enters the fourth connecting pipe 80, thus guaranteeing the safety of maintenance personnel. When the first shut-off valve 100 and the first spectacle valve 110 are closed, the connection between the second connecting pipe 70 and the gas dehydrator 30 can be completely severed, preventing any blast furnace gas from entering the gas dehydrator 30.

[0047] Combination Figure 1 In some embodiments, for safety reasons, the third connecting pipe 120 is provided with a second shut-off valve 130 and a second spectacle valve 140.

[0048] When maintenance is required on at least one of the gas dehydrator 30 and the composite hydrolysis tower 40, the second shut-off valve 130 and the second spectacle valve 140 are closed to disconnect the third connecting pipe 120 from the composite hydrolysis tower 30. This ensures that blast furnace gas only reaches the downstream desulfurization process through the third connecting pipe 120 and does not enter the composite hydrolysis tower 30, thus guaranteeing the safety of maintenance personnel. When the second shut-off valve 130 and the second spectacle valve 140 are closed, the connection between the second connecting pipe 70 and the gas dehydrator 30 can be completely cut off, preventing any blast furnace gas from entering the gas dehydrator 30.

[0049] In some embodiments, the hydrolysis device further includes a fifth connecting pipe 150 and a sixth connecting pipe 160. One end of the fifth connecting pipe 150 is connected to the dust removal assembly 10, and the other end is connected to the residual pressure power generation system 20, so that the dust-removed blast furnace gas can enter the residual pressure power generation system 20. One end of the sixth connecting pipe 160 is connected to the fifth connecting pipe 150, and the other end is connected to the second connecting pipe 70. A pressure reducing valve assembly 50 is disposed in the sixth connecting pipe 160, so that the dust-removed blast furnace gas can enter the pressure reducing valve assembly 50.

[0050] Combination Figure 1 In some embodiments, for safety reasons, the hydrolysis device further includes a vent pipe 170, a vent valve 180, and a third shut-off valve 190. The vent pipe 170 is connected to the gas outlet of the composite hydrolysis tower 40. The vent valve 180 is located in the vent pipe 170. The third shut-off valve 190 is located in the vent pipe 170.

[0051] In the event of a system malfunction, when the blast furnace gas is pressurized, to prevent a production accident from occurring in the composite hydrolysis tower 40, the third shut-off valve 190 and the vent valve 180 are opened to release the overpressurized blast furnace gas outside the composite hydrolysis tower 40 through the vent pipe 170, thus ensuring safety.

[0052] Combination Figure 1 In some embodiments, to ensure the normal operation of the composite hydrolysis tower 40, the hydrolysis device further includes a gas temperature regulator 200. The gas temperature regulator 200 is connected to the gas dehydrator 30 and the composite hydrolysis tower 40, and regulates the temperature of the blast furnace gas entering the composite hydrolysis tower 40 so that the temperature of the blast furnace gas is adjusted to the optimal temperature range required for hydrolysis.

[0053] Based on the same inventive concept, this application also proposes a blast furnace gas desulfurization system, which adopts the aforementioned hydrolysis device. The specific structure of the hydrolysis device is as described in the above embodiments. Since all the technical solutions of the above embodiments are adopted, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0054] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0055] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0057] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0058] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A hydrolysis apparatus, characterized in that, include: Dust removal components are connected to the blast furnace; The waste pressure power generation system is connected to the dust removal components; A gas dehydrator is connected to the residual pressure power generation system; A composite hydrolysis tower is connected to the gas dehydrator. The pressure reducing valve assembly is connected to the dust removal component and the gas dehydration tower.

2. The hydrolysis apparatus according to claim 1, characterized in that, The dust removal component includes: A gravity dust collector is connected to the blast furnace; The chlorine powder removal equipment is connected to the gravity dust collector. The bag filter is connected to the chlorine powder removal equipment, and is also connected to the pressure reducing valve group and the residual pressure power generation system.

3. The hydrolysis apparatus according to claim 2, characterized in that, The dechlorination powder equipment includes: The mixing cylinder is connected to the gravity dust collector and the bag dust collector; The nozzle is located inside the mixing cylinder; A dechlorination powder preparer is connected to the nozzle.

4. The hydrolysis apparatus according to claim 3, characterized in that, The chlorine removal powder equipment also includes: The first connecting pipe has one end connected to the nozzle and the other end connected to the dechlorination powder preparer; The control valve is located in the first connecting pipe; A check valve is installed in the first connecting pipe.

5. The hydrolysis apparatus according to any one of claims 1-4, characterized in that, The hydrolysis device further includes: The second connecting pipe is connected at one end to the pressure reducing valve group and the residual pressure power generation system, and at the other end to the gas dehydration tower. The third connecting pipe is connected to the gas outlet of the composite hydrolysis tower; The fourth connecting pipe is connected to the second connecting pipe and the third connecting pipe; A regulating valve is located in the fourth connecting pipe.

6. The hydrolysis apparatus according to claim 5, characterized in that, The second connecting pipe is equipped with a first shut-off valve and a first spectacle valve; The first shut-off valve and the first spectacle valve are located between the fourth connecting pipe and the gas dehydrator.

7. The hydrolysis apparatus according to claim 6, characterized in that, The third connecting pipe is equipped with a second shut-off valve and a second spectacle valve.

8. The hydrolysis apparatus according to any one of claims 1-4, characterized in that, The hydrolysis device further includes: The vent pipe is connected to the gas outlet of the composite hydrolysis tower; A vent valve is provided in the vent pipe; The third shut-off valve is located in the vent pipe.

9. The hydrolysis apparatus according to any one of claims 1-4, characterized in that, The hydrolysis device further includes: The gas temperature regulator is connected to the gas dehydrator and the composite hydrolysis tower.

10. A blast furnace gas desulfurization system, characterized in that, Includes the hydrolysis apparatus as described in any one of claims 1-9.

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