A blast furnace flue gas desulfurization device

Abstract

The invention discloses a blast furnace flue gas desulfurization device, comprising a supporting mechanism, a smoke inlet mechanism, a spray mechanism and a smoke outlet assembly connected in sequence from bottom to top, wherein the supporting mechanism comprises a circulation pool, a reducer is arranged in the circulation pool, a stirring frame is arranged at the output end of the reducer, a circulation pump and a motor are arranged below the circulation pool, and the circulation pump and the reducer are both connected to the motor; the smoke inlet mechanism comprises a fixed pipe and a rotating pipe, a flue gas flow channel is arranged between the fixed pipe and the rotating pipe, a plurality of groups of guide pipes are arranged on the inner wall of the rotating pipe along the circumference of the rotating pipe, the length of each group of guide pipes is shortened in sequence from bottom to top, a spiral guide plate is arranged in the guide pipe, and the spiral directions of the spiral guide plates in adjacent guide pipes are opposite. A rotating pipe is arranged in the tower, and a plurality of guide pipes of different lengths are arranged on the rotating pipe, and spiral guide plates with opposite spiral directions are installed in adjacent guide pipes, and the horizontal flow of flue gas can be broken by the rotation of the rotating pipe, thereby improving the desulfurization efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of sulfur-containing flue gas treatment, and in particular relates to a blast furnace flue gas desulfurization device. Background Art

[0002] During the blast furnace flue gas emission process, a large amount of flue gas containing sulfur will be generated, which needs to be desulfurized and purified before emission. The existing desulfurization is mostly done by the reaction of calcium hydroxide slurry with sulfur-containing gas to produce solid precipitation.

[0003] The slurry pool of traditional flue gas desulfurization equipment lacks a stirring device, and the sediment after desulfurization will accumulate in the slurry pool, affecting the operation of the equipment. In addition, as the desulfurization workload increases, the pH value of the slurry continues to decrease, which leads to unstable slurry desulfurization capacity. Moreover, the flue gas in the existing hollow desulfurization tower is prone to laminar flow, resulting in low desulfurization efficiency.

[0004] In summary, breaking the flue gas advection and stably monitoring and maintaining the slurry working capacity are areas where existing equipment needs to be improved.

[0005] Therefore, we need to design a blast furnace flue gas desulfurization device to solve these problems. Summary of the invention

[0006] The problem to be solved by the present invention is to provide a blast furnace flue gas desulfurization device.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A blast furnace flue gas desulfurization device comprises a supporting mechanism, a smoke inlet mechanism, a spray mechanism and a smoke outlet assembly which are sequentially connected from bottom to top;

[0009] The supporting mechanism comprises a circulation pool, a reducer is arranged in the circulation pool, a stirring frame is arranged at the output end of the reducer, a circulation pump and a motor are arranged below the circulation pool, and the circulation pump and the reducer are both connected to the motor;

[0010] The smoke inlet mechanism comprises a fixed tube and a rotating tube, a smoke flow channel is arranged between the fixed tube and the rotating tube, a plurality of groups of guide tubes are arranged on the inner wall of the rotating tube along the circumference of the rotating tube, the length of each group of guide tubes is shortened from bottom to top, a spiral guide plate is arranged in the guide tube, and the spiral directions of the spiral guide plates in adjacent guide tubes are opposite, and a connecting frame is also arranged on the rotating tube, and the connecting frame is connected to the stirring frame;

[0011] The spray mechanism comprises a demisting assembly and at least two spraying assemblies arranged in the spray tower, wherein the demisting assembly is located between the spraying assembly and the smoke outlet assembly, the spraying assembly is used to desulfurize the flue gas flowing in from the smoke inlet mechanism, and the demisting assembly is used to remove particulate impurities in the flue gas after desulfurization;

[0012] The smoke outlet assembly is used to discharge the smoke after impurities are removed from the spray tower.

[0013] Preferably, the spraying assembly includes a spraying main pipe, a slurry connecting cover, a plurality of spraying branch pipes and a plurality of spraying heads, one ends of the plurality of spraying branch pipes are fixed on the spraying main pipe and connected with the spraying main pipe, the plurality of spraying heads are respectively fixed on the plurality of spraying branch pipes, and the angle between the projection axes of the spraying main pipes on adjacent spraying assemblies on the horizontal plane is α, the slurry connecting cover is fixedly arranged on the outer wall of the spray tower, and the spraying main pipes on the plurality of spraying assemblies are connected with the slurry connecting cover.

[0014] Preferably, the demisting assembly includes a demisting filler, a spray connecting hood, a plurality of fixed rods, a plurality of water spray pipes and a plurality of nozzles. The spray connecting hood is fixedly arranged on the outer wall of the spray tower, the demisting filler is located in the spray tower above the spraying assembly, the plurality of fixed rods are respectively arranged on both sides of the demisting filler and are connected to the inner wall of the spray tower, the plurality of water spray pipes are respectively fixed on the fixed rods on both sides of the demisting filler, each of the water spray pipes is connected to the spray connecting hood, the plurality of nozzles are respectively arranged on the water spray pipes, and the output direction of each nozzle points to the demisting filler.

[0015] Preferably, the supporting mechanism includes a supporting tube, the circulating pool is fixedly arranged in the supporting tube, a liquid trough is arranged at the bottom of the circulating pool, the circulating pump is fixedly connected to the bottom of the circulating pool, and the feeding end of the circulating pump is connected to the circulating pool through the liquid trough, an impeller is rotatably arranged in the pump casing of the circulating pump, a transmission shaft is fixedly arranged on the impeller, the free end of the transmission shaft is connected to the input end of the reducer, the motor is connected to the pump casing, and the output end of the motor is connected to the impeller.

[0016] Furthermore, the circulation pool is also provided with a slurry inlet pipe, a slurry outlet pipe and a sensor, the slurry inlet pipe is provided with a metering control valve, the free end of the slurry outlet pipe is provided with a three-way control valve, one output end of the three-way control valve is provided with a circulation pipe, the free end of the circulation pipe is connected to the slurry connecting cover, the other output end of the three-way control valve is provided with a separator, the solid-state output end of the separator is provided with a measuring tube, the liquid output end of the separator is provided with a flow meter, and the flow meter, the metering control valve, the sensor, the three-way control valve and the measuring tube are all connected to the circulation controller.

[0017] Preferably, the smoke outlet assembly includes a smoke outlet hood, a smoke outlet pipe and a guide frame, the smoke outlet hood is trumpet-shaped, and the large opening end is connected to the spray tower, the smoke outlet pipe is connected to the small opening end of the smoke outlet hood, and the guide frame is located inside the smoke outlet hood.

[0018] Preferably, the fixed tube and the rotating tube are connected via a sealing fastener.

[0019] Furthermore, a sealing ring plate is fixedly arranged in the pump housing, the sealing ring plate is slidingly fitted with the impeller, and a sealing ring is arranged at the connection between the sealing ring plate and the impeller.

[0020] Preferably, the reducer includes a housing, a ring gear, a transmission gear, and a drive gear output frame, the housing is fixedly connected to the circulating pool, the ring gear is located in the housing and fixedly connected to the housing, the drive gear is located on the inner side of the ring gear and is connected to the transmission shaft, the output frame is located on one side of the drive gear and is connected to the stirring frame through a connecting shaft, and the transmission gear is rotatably set on the output frame and meshes with the drive gear and the ring gear, respectively.

[0021] Preferably, a stirring scraper is fixedly provided on the stirring frame, and the stirring scraper is slidably fitted to the inner wall of the circulation pool.

[0022] The advantages and positive effects of the present invention are:

[0023] The present invention improves the smoke inlet mechanism of a traditional hollow desulfurization tower, arranges a rotating tube in the tower, arranges a plurality of guide tubes with different lengths on the rotating tube, and installs spiral guide plates with opposite spiral directions in adjacent guide tubes. The rotation of the rotating tube can break the advection of flue gas and improve the desulfurization efficiency. The slurry in the circulation pool can be stirred by a stirring rack and a stirring scraper to avoid precipitation of desulfurization products affecting equipment operation. The pH value of the slurry in the circulation pool can be detected by a sensor to ensure that the slurry is in an optimal desulfurization state. The slurry consumption can be recorded by a flow meter and a measuring tube. Automatic control can be achieved by a metering control valve and a three-way control valve connected to a circulation controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic cross-sectional view of the internal structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the internal structure of the circulation pool of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the multi-layer spraying assembly of the present invention viewed from above in the spray tower;

[0029] Figure 5 It is a schematic diagram of the structure of the spraying assembly of the present invention;

[0030] Figure 6 It is a schematic diagram of the structure of the demisting assembly of the present invention;

[0031] Figure 7 yes Figure 2 A magnified view of the structure at A;

[0032] Figure 8 yes Figure 2 Enlarged view of the structure at B in the figure.

[0033] The following are the descriptions of the reference numerals:

[0034] 1. Spraying mechanism; 11. Spraying assembly; 12. Demisting assembly; 111. Spraying main pipe; 112. Spraying branch pipe; 113. Spraying head; 121. Demisting filler; 122. Fixed rod; 123. Water spraying pipe; 124. Spraying head; 125. Spraying tower; 126. Slurry connecting cover; 127. Spraying connecting cover; 128. Water inlet pipe; 2. Smoke inlet mechanism; 201. Fixed pipe; 202. Rotating pipe; 203. Guide pipe; 204. Spiral guide plate; 205. Sealing fastener; 206. Smoke inlet pipe; 3. Circulation mechanism; 301. Support pipe; 302. Circulation pool; 303. Motor; 304. Circulation pump; 3041. Pump casing; 3042. Impeller; 3043 , sealing ring plate; 3044, sealing ring; 305, reducer; 3051, housing; 3052, gear ring; 3053, transmission gear; 3054, driving gear; 3055, output frame; 306, liquid trough; 307, transmission shaft; 308, connecting shaft; 309, stirring frame; 310, stirring scraper; 311, connecting frame; 312, slurry outlet pipe; 313, three-way control valve; 314, circulation pipe; 315, separator; 316, measuring pipe; 317, slurry inlet pipe; 319, metering control valve; 320, sensor; 321, flow meter; 322, circulation controller; 4, smoke outlet assembly; 401, smoke outlet hood; 402, smoke outlet pipe; 403, guide frame. DETAILED DESCRIPTION

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0037] The present invention will be further described below in conjunction with the accompanying drawings:

[0038] Example 1: Figure 1 As shown, a blast furnace flue gas desulfurization device comprises a supporting mechanism 3, a smoke inlet mechanism 2, a spraying mechanism 1 and a smoke outlet assembly 4 which are sequentially connected from bottom to top;

[0039] The supporting mechanism 3 includes a circulation pool 302, a reducer 305 is arranged in the circulation pool 302, a stirring frame 309 is arranged at the output end of the reducer 305, a circulation pump 304 and a motor 303 are arranged below the circulation pool 302, and the circulation pump 304 and the reducer 305 are both connected to the motor 303;

[0040] The smoke inlet mechanism 2 includes a fixed tube 201 and a rotating tube 202, a smoke flow channel is provided between the fixed tube 201 and the rotating tube 202, a plurality of groups of guide tubes 203 are provided on the inner wall of the rotating tube 202 along the circumference of the rotating tube 202, the length of each group of guide tubes 203 is shortened from bottom to top, a spiral guide plate 204 is provided in the guide tube 203, and the spiral directions of the spiral guide plates 204 in adjacent guide tubes 203 are opposite, and a connecting frame 311 is also provided on the rotating tube 202, and the connecting frame 311 is connected to the stirring frame 309;

[0041] The spray mechanism 1 includes a demisting assembly 12 and at least two spraying assemblies 11 arranged in a spray tower 125. The demisting assembly 12 is located between the spraying assembly 11 and the smoke outlet assembly 4. The spraying assembly 11 is used to desulfurize the flue gas flowing in from the smoke inlet mechanism 2, and the demisting assembly 12 is used to remove particulate impurities in the flue gas after desulfurization.

[0042] The smoke outlet assembly 4 is used to discharge the smoke after impurities are removed from the spray tower 125 .

[0043] like Figure 2 , Figure 4 and Figure 5As shown, the spray assembly 11 includes a spray main pipe 111, a slurry connecting cover 126, a plurality of spray branch pipes 112 and a plurality of spray heads 113, one end of each of the plurality of spray branch pipes 112 is fixed on the spray main pipe 111 and is connected to the spray main pipe 111, a plurality of spray heads 113 are respectively fixed on the plurality of spray branch pipes 112, and an angle between the projection axes of the spray main pipes 111 on adjacent spray assemblies 11 on a horizontal plane is α, wherein 8°<α<20° is optimal, a slurry connecting cover 126 is fixedly disposed on the outer wall of a spray tower 125, and the spray main pipes 111 on the plurality of spray assemblies 11 are all connected to the slurry connecting cover 126.

[0044] like Figure 2 and Figure 6 As shown, the demisting assembly 12 includes a demisting filler 121, a spray connecting hood 127, a plurality of fixed rods 122, a plurality of water spray pipes 123 and a plurality of nozzles 124. The spray connecting hood 127 is fixedly arranged on the outer wall of the spray tower 125. The demisting filler 121 is located in the spray tower 125 above the spraying assembly 11. The plurality of fixed rods 122 are respectively arranged on both sides of the demisting filler and are connected to the inner wall of the spray tower 125. The plurality of water spray pipes 123 are respectively fixed on the fixed rods 122 on both sides of the demisting filler 121. Each water spray pipe 123 is connected to the spray connecting hood 127. The plurality of nozzles 124 are respectively arranged on the water spray pipes 123, and the output direction of each nozzle 124 points to the demisting filler 121.

[0045] like Figure 2 and Figure 3 The supporting mechanism 3 includes a supporting tube 301, a circulating pool 302 is fixedly arranged in the supporting tube 301, a liquid trough 306 is arranged at the bottom of the circulating pool 302, a circulating pump 304 is fixedly connected to the bottom of the circulating pool 302, and a feed end of the circulating pump 304 is connected to the circulating pool 302 through the liquid trough 306.

[0046] like Figure 7 As shown, the circulation pump 304 is a centrifugal pump, and an impeller 3042 is rotatably arranged in a pump casing 3041 of the circulation pump 304. A sealing ring plate 3043 is also fixedly arranged on the pump casing 3041 above the impeller 3042. The sealing ring plate 3043 and the impeller 3042 are slidingly fitted, and a sealing ring 3044 is arranged at the connection between the sealing ring plate 3043 and the impeller 3042. A transmission shaft 307 is fixedly arranged on the impeller 3042, and the free end of the transmission shaft 307 is connected to the input end of the reducer 305, the motor 303 is connected to the pump casing 3041, and the output end of the motor 303 is connected to the impeller 3042.

[0047] Specifically, the circulation pool 302 is also provided with a slurry inlet pipe 317, a slurry outlet pipe 312 and a sensor 320. The slurry inlet pipe 317 is provided with a metering control valve 319. The free end of the slurry outlet pipe 312 is provided with a three-way control valve 313. One output end of the three-way control valve 313 is provided with a circulation pipe 314. The free end of the circulation pipe 314 is connected to the slurry connecting cover 126. The other output end of the three-way control valve 313 is provided with a separator 315. The separator 315 is a cyclone separator 315, which uses the rotating flow of water in the conical cavity to separate the precipitated impurities from the liquid. The solid output end of the separator 315 is provided with a measuring tube 316, and the liquid output end of the separator 315 is provided with a flow meter 321. The flow meter 321, the metering control valve 319, the sensor 320, the three-way control valve 313 and the measuring tube 316 are all connected to the circulation controller 322.

[0048] Specifically, the smoke outlet assembly 4 includes a smoke outlet hood 401, a smoke outlet pipe 402 and a guide frame 403. The smoke outlet hood 401 is trumpet-shaped, and the large opening end is connected to the spray tower 125. The smoke outlet pipe 402 is connected to the small opening end of the smoke outlet hood 401. The guide frame 403 is located inside the smoke outlet hood 401.

[0049] Specifically, the fixed tube 201 and the rotating tube 202 are connected via a sealing fastener 205 .

[0050] Furthermore, the reducer 305 includes a shell 3051, a ring gear 3052, a transmission gear 3053, a drive gear 3054 and an output frame 3055. The shell 3051 is fixedly connected to the circulation pool 302. The ring gear 3052 is located in the shell 3051 and is fixedly connected to the shell 3051. The drive gear 3054 is located on the inner side of the ring gear 3052 and is connected to the transmission shaft 307. The output frame 3055 is located on one side of the drive gear 3054 and is connected to the stirring frame 309 through the connecting shaft 308. The transmission gear 3053 is rotatably set on the output frame 3055 and is respectively meshed with the drive gear 3054 and the ring gear 3052.

[0051] like Figure 3 As shown, a stirring scraper 310 is fixedly provided on the stirring frame 309 , and the stirring scraper 310 is slidably fitted to the inner wall of the circulation pool 302 .

[0052] The working process of this embodiment is as follows: before work, the slurry must first be prepared according to the sulfur content of the flue gas. After the prepared slurry, the three-way control valve 313 is used to connect the slurry outlet pipe 312 and the circulation pipe 314, and then the metering control valve 319 is opened to transport the prepared slurry to the circulation pool 302 through the slurry inlet pipe 317. While inputting, the metering control valve 319 will record the volume of slurry flowing into the circulation pool 302.

[0053] Then, the motor 303 is powered on. After the motor 303 is powered on, the impeller 3042 of the circulation pump 304 is driven to rotate. After the impeller 3042 rotates, the slurry is sucked from the liquid tank 306 into the pump housing 3041, and is thrown out from the impeller 3042 under the action of centrifugal force. The thrown out slurry enters the slurry outlet pipe 312. The slurry flows out of the slurry outlet pipe 312 and passes through the three-way control valve 313. Then, the slurry enters the slurry communication cover 126 along the circulation pipe 314. The slurry entering the slurry communication cover 126 will flow into the spray main pipe 111 respectively, and spray out through the spray head 113 on the spray branch pipe 112, forming a slurry spray in the spray tower 125. At the same time, the water inlet pipe 128 will transport water to the spray communication cover 127, and enter the water spray pipe 123 through the spray communication cover 127, and spray out through the spray head 124.

[0054] It should be noted that the output direction of the nozzle 124 is directed to the demisting filler 121, so water will be sprayed onto the demisting filler 121, and the dust particles carried by the smoke can be filtered when the smoke passes through, so as to ensure that the smoke can meet the emission standards.

[0055] After the slurry in the spray tower 125 forms a slurry spray, the fan is started. The fan conveys the smoke to the smoke flow channel between the fixed pipe 201 and the rotating pipe 202 through the smoke inlet pipe 206 connected to the fixed pipe 201, and enters different guide pipes 203 through the smoke flow channel. When the smoke passes through the guide pipe 203, Figure 8 The spiral guide plate 204 shown will rotate, and because the spiral guide plates 204 in adjacent guide pipes 203 have opposite spiral directions, the flue gas will respectively present clockwise and counterclockwise rotation states after flowing out of the guide pipe 203. Therefore, the flue gas flowing out of two adjacent guide pipes 203 will not interfere with each other and weaken during rotation, and the airflow between the two groups of rotating flue gases will also be driven by the two groups of spiral flue gases. At the same time, when the stirring frame 309 rotates, it will drive the rotating tube 202 to rotate through the connecting frame 311. After the rotating tube 202 rotates, it will drive the guide pipe 203 to rotate around the axis of the spray tower 125. Finally, the airflow flowing out of different guide pipes 203 will eventually form a spiral rising flue gas in the desulfurization tower, breaking the situation that the flue gas in the traditional desulfurization tower will produce horizontal flow, and improving the desulfurization effect of the slurry on the flue gas.

[0056] Since the slurry in the circulation pool 302 will be continuously circulated under the action of the circulation pump 304, the slurry will produce precipitation after reacting with the sulfide in the flue gas, and the pH value of the slurry will increase. At this time, the desulfurization ability of the slurry will be reduced. When the pH of the slurry increases to the set threshold, the circulation controller 322 will control the three-way valve to connect with the separator 315, and the precipitation in the slurry entering the separator 315 will be separated and enter the measuring tube 316. The slurry after separation and precipitation will be transported to the spraying assembly 11 after passing through the flow meter 321. At the same time, the metering control valve 319 will also be opened to add new slurry to the circulation pool 302 through the slurry inlet pipe 317 until the pH of the slurry reaches the initial set threshold and stops.

[0057] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A blast furnace flue gas desulfurization device, characterized in that: It comprises a supporting mechanism (3), a smoke inlet mechanism (2), a spray mechanism (1) and a smoke outlet assembly (4) which are connected in sequence from bottom to top; The support mechanism (3) comprises a circulation pool (302), a reducer (305) is arranged in the circulation pool (302), a stirring frame (309) is arranged at the output end of the reducer (305), a circulation pump (304) and a motor (303) are arranged below the circulation pool (302), and the circulation pump (304) and the reducer (305) are both connected to the motor (303); The smoke inlet mechanism (2) comprises a fixed tube (201) and a rotating tube (202); a smoke flow channel is provided between the fixed tube (201) and the rotating tube (202); a plurality of groups of guide tubes (203) are provided on the inner wall of the rotating tube (202) along the circumference of the rotating tube (202); the length of each group of guide tubes (203) is shortened from bottom to top; a spiral guide plate (204) is provided in the guide tube (203); the spiral directions of the spiral guide plates (204) in adjacent guide tubes (203) are opposite; a connecting frame (311) is also provided on the rotating tube (202); the connecting frame (311) is connected to the stirring frame (309); The spray mechanism (1) comprises a demisting assembly (12) and at least two spraying assemblies (11) arranged in a spray tower (125); the demisting assembly (12) is located between the spraying assembly (11) and the smoke outlet assembly (4); the spraying assembly (11) is used to perform desulfurization on the smoke flowing in from the smoke inlet mechanism (2); and the demisting assembly (12) is used to remove particulate impurities in the smoke after desulfurization; The smoke outlet assembly (4) is used to discharge the smoke after impurities removal from the spray tower (125); The spray assembly (11) comprises a spray main pipe (111), a slurry communication cover (126), a plurality of spray branch pipes (112) and a plurality of spray heads (113); one end of each of the plurality of spray branch pipes (112) is fixed on the spray main pipe (111) and is communicated with the spray main pipe (111); the plurality of spray heads (113) are respectively fixed on the plurality of spray branch pipes (112); the angle between the projected axes of the spray main pipes (111) on adjacent spray assemblies (11) on a horizontal plane is α; the slurry communication cover (126) is fixedly arranged on the outer wall of the spray tower (125); and the spray main pipes (111) on the plurality of spray assemblies (11) are communicated with the slurry communication cover (126).

2. A blast furnace flue gas desulfurization device according to claim 1, characterized in that: The demisting assembly (12) comprises a demisting filler (121), a spray connecting cover (127), a plurality of fixing rods (122), a plurality of water spray pipes (123) and a plurality of spray heads (124); the spray connecting cover (127) is fixedly arranged on the outer wall of the spray tower (125); the demisting filler (121) is located in the spray tower (125) above the spraying assembly (11); and the plurality of fixing rods (122) are respectively arranged on the demisting filler (121). The spray pipes (123) are respectively fixed on the fixing rods (122) on both sides of the demisting filler (121), and each of the spray pipes (123) is connected to the spray connecting cover (127). The spray heads (124) are respectively arranged on the spray pipes (123), and the output direction of each of the spray heads (124) is directed toward the demisting filler (121).

3. A blast furnace flue gas desulfurization device according to claim 1, characterized in that: The support mechanism (3) comprises a support tube (301), the circulation pool (302) is fixedly arranged in the support tube (301), a liquid trough (306) is arranged at the bottom of the circulation pool (302), the circulation pump (304) is fixedly connected to the bottom of the circulation pool (302), and the feed end of the circulation pump (304) is connected to the circulation pool (302) through the liquid trough (306), an impeller (3042) is rotatably arranged in a pump casing (3041) of the circulation pump (304), a transmission shaft (307) is fixedly arranged on the impeller (3042), a free end of the transmission shaft (307) is connected to the input end of the reducer (305), the motor (303) is connected to the pump casing (3041), and the output end of the motor (303) is connected to the impeller (3042).

4. A blast furnace flue gas desulfurization device according to claim 1, characterized in that: The circulation pool (302) is also provided with a slurry inlet pipe (317), a slurry outlet pipe (312) and a sensor (320); the slurry inlet pipe (317) is provided with a metering control valve (319); a three-way control valve (313) is provided at the free end of the slurry outlet pipe (312); a circulation pipe (314) is provided at one output end of the three-way control valve (313); the free end of the circulation pipe (314) is connected to the slurry communication cover (126); A separator (315) is provided at the other output end of the three-way control valve (313), a measuring tube (316) is provided at the solid output end of the separator (315), a flow meter (321) is provided at the liquid output end of the separator (315), and the flow meter (321), the metering control valve (319), the sensor (320), the three-way control valve (313) and the measuring tube (316) are all connected to a circulation controller (322).

5. A blast furnace flue gas desulfurization device according to claim 1, characterized in that: The smoke outlet assembly (4) comprises a smoke outlet hood (401), a smoke outlet pipe (402) and a guide frame (403); the smoke outlet hood (401) is trumpet-shaped, and a large opening end is connected to the spray tower (125); the smoke outlet pipe (402) is connected to a small opening end of the smoke outlet hood (401); and the guide frame (403) is located inside the smoke outlet hood (401).

6. A blast furnace flue gas desulfurization device according to claim 1, characterized in that: The fixed tube (201) and the rotating tube (202) are connected via a sealing fastener (205).

7. A blast furnace flue gas desulfurization device according to claim 3, characterized in that: A sealing ring plate (3043) is also fixedly disposed in the pump housing (3041), the sealing ring plate (3043) is slidably fitted with the impeller (3042), and a sealing ring (3044) is disposed at the connection between the sealing ring plate (3043) and the impeller (3042).

8. A blast furnace flue gas desulfurization device according to claim 3, characterized in that: The reducer (305) comprises a housing (3051), a ring gear (3052), a transmission gear (3053), a driving gear (3054) and an output frame (3055); the housing (3051) is fixedly connected to the circulation pool (302); the ring gear (3052) is located in the housing (3051) and is fixedly connected to the housing (3051); the driving gear (3054) is located inside the ring gear (3052) and is connected to the transmission shaft (307); the output frame (3055) is located on one side of the driving gear (3054) and is connected to the stirring frame (309) via a connecting shaft (308); the transmission gear (3053) is rotatably arranged on the output frame (3055) and is respectively meshed with the driving gear (3054) and the ring gear (3052).

9. A blast furnace flue gas desulfurization device according to claim 3, characterized in that: A stirring scraper (310) is fixedly arranged on the stirring frame (309), and the stirring scraper (310) is slidably fitted to the inner wall of the circulation pool (302).

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