A flue gas treatment device and method for a thermal power plant

Abstract

The present invention discloses a flue gas treatment device and method for a thermal power plant, belonging to the technical field of flue gas purification treatment, comprising a reaction cylinder, wherein a partition is horizontally fixed at the middle position inside the reaction cylinder, and the partition divides the reaction cylinder into two upper and lower treatment chambers, and an air inlet seat is arranged in the treatment chamber located at the lower part, and an air inlet pipe is horizontally connected to the outside of the air inlet seat, and a centrifugal separator is sealed and connected below the air inlet seat; an air washing unit is also arranged in the treatment chamber at the lower part, and the air washing unit is connected to each exhaust channel of the centrifugal separator; a catalytic reduction device is arranged in the treatment chamber located at the upper part; an air guide chamber is arranged above the interior of the reaction cylinder, and a discharge tube is vertically arranged above the air guide chamber, and fan blades are installed in the discharge tube. The present invention can divide the pretreated flue gas into multiple streams, so that different air washing chambers in the air washing unit can perform flexible air washing treatment, thereby optimizing the desulfurization purification process.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a flue gas treatment device and method for a thermal power plant. Background Art

[0002] The flue gas generated by thermal power plants contains a large amount of pollutants, mainly including sulfur dioxide (SO2), nitrogen oxides (NOx), particulate matter, mercury and its compounds, etc. Direct emissions will have serious impacts on the environment and human health. Therefore, a series of purification treatments must be carried out, among which the core steps are desulfurization and denitrification. Early desulfurization methods were relatively simple, such as limestone wet washing, which was effective but relatively inefficient. With the improvement of environmental protection requirements, more efficient technologies have been developed. In the prior art, such as the invention patent with publication number CN115090100B, it is able to oxidize and absorb flue gas and absorb acidic gases to complete desulfurization and denitrification treatment, but it is easily affected by changes in flue gas concentration during flue gas rolling scrubbing treatment, causing blockage in the drum. At the same time, the single rolling scrubbing structure cannot flexibly respond to large fluctuations in flue gas composition and concentration, resulting in unstable desulfurization and denitrification treatment effects;

[0003] Therefore, it is necessary to provide a flue gas treatment device and method for a thermal power plant to solve the problems raised in the above background technology. Summary of the invention

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flue gas treatment device for a thermal power plant, comprising a reaction tube, a partition is horizontally fixed in the middle position inside the reaction tube, the partition divides the reaction tube into two upper and lower treatment chambers, an air intake seat is arranged in the lower treatment chamber, an air intake pipe is horizontally connected to the outside of the air intake seat, a centrifugal separator is sealed below the air intake seat, and the centrifugal separator performs pre-treatment and separation on the flue gas; a scrubber unit is also arranged in the lower treatment chamber, and the scrubber unit includes a scrubber The gas bins are arranged in a plurality of ways, each of which is provided with a gas washing cylinder, one end of which is provided with an air intake device, which is connected with the exhaust passage of the centrifugal separator, and the gas washing bin is provided with a quantitative amount of limestone slurry, and the side wall of the gas washing cylinder is provided with a plurality of air vents, the lower air vents are immersed in the limestone slurry, and liquid-retaining cotton is provided in the air vents; the gas washing unit desulfurizes the flue gas through the limestone slurry, thereby removing sulfur oxides in the flue gas to achieve a preliminary purification effect;

[0005] A catalytic reduction device is arranged in the treatment chamber located above, and a transfer pipe is connected to the outside of the scrubbing unit, one end of which is connected to the air inlet end of the catalytic reduction device. The catalytic reduction device mixes ammonia as a reducing agent with the flue gas and reacts through a catalyst, thereby reducing nitrogen oxide emissions;

[0006] An air guide chamber is arranged above the interior of the reaction cylinder, the air guide chamber is connected to the exhaust end of the catalytic reduction device, an exhaust tube is vertically arranged above the air guide chamber, and a fan blade is installed in the exhaust tube;

[0007] A spray assembly is also provided in the scrubber, and the spray assembly adaptively sprays limestone slurry in the scrubber based on the flue gas concentration in the scrubber, so as to respond to changes in flue gas conditions in real time to maintain an efficient and stable desulfurization effect; an air pipe is horizontally connected to the scrubber, and one end of the air pipe is connected to the transfer tube.

[0008] Further, as a preference, the air intake device includes a sealing seat, one end of which is connected to a fixed air seat, an inner chamber is provided in the fixed air seat, a smoke pipe is vertically connected to the inner chamber, and the smoke pipe is connected to the centrifugal separator; a straight pipe is horizontally connected in the sealing seat, one end of the straight pipe is connected to the inner chamber, and the other end of the straight pipe is connected to a diversion pipe; a plurality of smoke holes are distributed circumferentially on the diversion pipe.

[0009] Furthermore, preferably, the inner diameter of each smoke hole on the diverter pipe gradually increases toward the side away from the sealing seat.

[0010] Further, as a preference, the spray assembly comprises a spray plate, a liquid delivery seat is coaxially arranged inside the spray plate, a plurality of liquid delivery pipes arranged horizontally are circumferentially distributed on the liquid delivery seat, and the liquid delivery pipes are provided with spray holes; a positioning plate is fixed inside the air washer, the liquid delivery pipes are all penetrated and fixed on the positioning plate, a liquid supply pipe is installed on the spray plate, and the liquid supply pipe is connected with each of the liquid delivery pipes through a cavity arranged in the liquid delivery seat;

[0011] The spray plate is also provided with a motor drive unit, the liquid supply main pipe and the liquid delivery seat are both rotatably connected to the spray plate, and the output end of the motor drive unit is transmission-connected to the liquid supply main pipe through gear meshing.

[0012] Furthermore, as a preferred embodiment, the gas washer rotates synchronously with the liquid supply main pipe to immerse the liquid-stagnant cotton in the gas vent into the limestone slurry one by one;

[0013] A liquid guide plate is coaxially arranged on the gas washing cylinder, the gas washing cylinder is sealed and rotatably connected to the liquid guide plate, and a liquid drain pipe is connected to the liquid guide plate.

[0014] Further, as a preference, the liquid supply main pipe is provided with two liquid channels, and the liquid supply seat has two independently arranged cavities, an inner sleeve is slidably connected between the liquid supply seat and the liquid supply main pipe, and when one of the liquid channels is connected to the cavities, the other liquid channel is connected to the other cavities;

[0015] The liquid delivery pipes are divided into two groups according to the specifications of the spray holes, and each group of the liquid delivery pipes is connected to the corresponding cavities respectively.

[0016] Further, as a preference, a slot is provided on one side of the inner sleeve close to the liquid supply main pipe, and a latch tooth is provided at the end of the liquid supply main pipe. When the inner sleeve slides toward the side of the liquid supply main pipe, the latch tooth engages with the slot, and at this time, the liquid supply main pipe synchronously controls the liquid delivery seat to rotate through the inner sleeve.

[0017] Further, as a preference, the two liquid channels of the liquid supply main pipe are symmetrically distributed at one end close to the inner sleeve, while the other ends of the two liquid channels are cocentrically distributed;

[0018] The inner liquid channel is externally connected with a pulse liquid pipe, and the outer liquid channel is externally sealed and connected with a flow stabilization chamber.

[0019] Further, as a preferred embodiment, a method for treating flue gas in a thermal power plant comprises the following steps:

[0020] S1. Flue gas collection: The flue gas from the thermal power plant is collected and transported through the flue gas pipeline, and its temperature is reduced to a range suitable for purification after pre-cooling;

[0021] S2. Centrifugal pretreatment: The flue gas is pretreated and separated by a centrifugal separator, so that the solid particles or liquid droplets carried are separated from the gas under the combined action of gravity and centrifugal force; the separated flue gas enters the scrubbing bin in the scrubbing unit in sequence through each exhaust channel of the centrifugal separator, so that the corresponding scrubbing bin scrubs and desulfurizes the flue gas, thereby removing sulfur dioxide in the flue gas through chemical reaction;

[0022] S3. Denitrification treatment: the flue gas after desulfurization is transported to the catalytic reduction device, and the ammonia reducing agent is injected according to the flue gas conditions by selecting a suitable method, and reacts with nitrogen oxides at an appropriate temperature to convert them into harmless gases;

[0023] S4. Dust removal and purification, using high voltage electric field to charge dust particles and adsorb them on dust collecting plates, followed by activated carbon adsorption or other special chemical treatment, and continuous monitoring of flue gas emission pollutant concentrations in the later stage.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] In the present invention, the flue gas discharged from the thermal power plant is pre-separated by a centrifugal separator. On the one hand, large particles in the flue gas can be effectively separated to avoid blockage in the subsequent scrubbing process. On the other hand, the pre-treated flue gas can be divided into multiple streams, so that different scrubbing chambers in the scrubbing unit can perform flexible scrubbing treatment, optimize the desulfurization purification process, and ensure the treatment efficiency and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a cross-sectional view of the gas washing unit in the present invention.

[0028] Figure 3 It is a schematic diagram of the structure of the gas washing unit in the present invention.

[0029] Figure 4 It is a schematic diagram of the structure of the air intake device in the present invention.

[0030] Figure 5 It is a schematic diagram of the structure of the spray assembly in the present invention.

[0031] Figure 6 It is a structural schematic diagram of the liquid supply main pipe and the containing cavity in the present invention.

[0032] Figure 7 It is a schematic diagram of the structure of the latch teeth and the latch slot in the present invention.

[0033] In the figure: 1. reaction cylinder; 11. air inlet seat; 12. centrifugal separator; 13. air inlet pipe; 14. partition; 15. catalytic reduction device; 16. air guide chamber; 17. discharge cylinder; 18. fan blade; 19. adapter tube; 2. air washing unit; 21. air washing chamber; 22. air washing cylinder; 23. air vent; 24. air pipe; 3. air inlet device; 31. sealing seat; 32. fixed air seat; 33. diverter pipe; 34. straight pipe; 35. inner chamber; 36. smoke pipe; 4. spray assembly; 41. spray plate; 42. liquid delivery seat; 43. liquid delivery pipe; 44. positioning plate; 45. cavity; 46. liquid guide plate; 47. discharge pipe; 5. liquid supply main pipe; 51. inner sleeve; 52. steady flow chamber; 53. pulse liquid pipe; 54. liquid channel; 55. latching teeth. DETAILED DESCRIPTION

[0034] See also Figure 1-Figure 7In an embodiment of the present invention, a flue gas treatment device for a thermal power plant includes a reaction tube 1, a partition 14 is horizontally fixed in the middle of the reaction tube 1, and the partition 14 divides the reaction tube 1 into two upper and lower treatment chambers. An air intake seat 11 is arranged in the lower treatment chamber, and an air intake pipe 13 is transversely connected to the outside of the air intake seat 11. A centrifugal separator 12 is sealed and connected below the air intake seat 11. The centrifugal separator 12 performs pre-treatment separation on the flue gas, that is, it uses the principle of centrifugal force to efficiently separate larger particles carried by the flue gas, such as fly ash and other solid residues. The waste gas is desulfurized by the limestone slurry, and the flue gas is fully contacted with the limestone slurry. SO2 reacts chemically with CaCO3 in the slurry to generate gypsum, thereby removing sulfur oxides in the flue gas to achieve a preliminary purification effect.

[0035] A catalytic reduction device 15 is arranged in the processing chamber located above, and a transfer pipe 19 is connected to the outside of the scrubbing unit 2, one end of the transfer pipe 19 is connected to the air inlet end of the catalytic reduction device 15, and the catalytic reduction device 15 mixes ammonia as a reducing agent with the flue gas and reacts through a catalyst, thereby reducing nitrogen oxide emissions;

[0036] An air guide chamber 16 is disposed above the interior of the reaction tube 1. The air guide chamber 16 is connected to the exhaust end of the catalytic reduction device 15. A discharge tube 17 is vertically disposed above the air guide chamber 16. A fan blade 18 is installed inside the discharge tube 17 so that the purified flue gas can be discharged through the discharge tube.

[0037] The scrubbing unit 2 includes a scrubbing bin 21, which is arranged in a plurality in a transverse manner. A scrubbing cylinder 22 is provided in each scrubbing bin 21. An air inlet device 3 is provided at one end of the scrubbing cylinder 22. The air inlet device 3 is connected to the exhaust passage of the centrifugal separator 12. Limestone slurry is quantitatively stored in the scrubbing bin 21. A plurality of air vents 23 are provided on the side wall of the scrubbing cylinder 22. The air vents 23 at the bottom are immersed in the limestone slurry. Liquid-retaining cotton is provided in the air vents 23.

[0038] A spray assembly 4 is also provided in the scrubber 22. The spray assembly 4 adaptively sprays limestone slurry in the scrubber 22 based on the flue gas concentration in the scrubber 22, so as to respond to changes in flue gas conditions in real time and maintain an efficient and stable desulfurization effect; an air pipe 24 is horizontally connected to the scrubber 21, and one end of the air pipe 24 is connected to the transfer pipe 19, that is, the flue gas pre-treated and separated by the centrifugal separator can be divided into multiple streams according to the concentration (the key parameters such as SO2 concentration, temperature, humidity in the flue gas can be continuously monitored by the flue gas analyzer), so as to adjust the spraying amount and spraying effect of the limestone slurry, which can not only cope with the overall changes in the flue gas conditions, but also make a quick response to local concentration abnormalities.

[0039] In this embodiment, the air intake device 3 includes a sealing seat 31, one end of which is connected to a fixed air seat 32, an inner bin 35 is provided in the fixed air seat 32, a smoke pipe 36 is vertically connected to the inner bin 35, and the smoke pipe 36 is connected to the centrifugal separator 12; a straight pipe 34 is horizontally connected to the sealing seat 31, one end of the straight pipe 34 is connected to the inner bin 35, and the other end of the straight pipe 34 is connected to a diverter pipe 33; a plurality of smoke holes are distributed circumferentially on the diverter pipe 33, so that the smoke can be diffused and distributed into the scrubber through the smoke holes on the diverter pipe, and the smoke treated by scrubbing can be discharged to the outside through the air pipe on the scrubbing bin.

[0040] As a preferred embodiment, the inner diameter of each smoke hole on the diverter pipe 33 is gradually increased toward the side away from the sealing seat 31, so as to further improve the uniformity of smoke diffusion distribution.

[0041] In this embodiment, the spray assembly 4 includes a spray plate 41, a liquid delivery seat 42 is coaxially arranged inside the spray plate 41, and a plurality of horizontally arranged liquid delivery pipes 43 are distributed on the circumference of the liquid delivery seat 42, and the liquid delivery pipes 43 are provided with spray holes; a positioning plate 44 is fixed in the air washer 22, and the liquid delivery pipes 43 are all fixed on the positioning plate 44, and a liquid supply pipe 5 is installed on the spray plate 41, and the liquid supply pipe 5 is connected with each of the liquid delivery pipes 43 through a cavity 45 arranged in the liquid delivery seat 42;

[0042] The spray plate 41 is also provided with a motor drive unit (not shown in the figure), and the liquid supply pipe 5 and the liquid delivery seat 42 are both rotatably connected to the spray plate 41. The output end of the motor drive unit is transmission-connected to the liquid supply pipe 5 through gear meshing. That is to say, the limestone slurry can be sprayed in the scrubber through multiple liquid delivery pipes, so as to be fully mixed and reacted with the flue gas in the scrubber, thereby effectively removing sulfur oxides.

[0043] In this embodiment, the scrubber 22 rotates synchronously with the liquid supply main pipe 5 to immerse the liquid-retaining cotton in the gas passage 23 into the limestone slurry one by one; so that the flue gas treated by spraying can further react with the limestone slurry in the liquid-retaining cotton, increasing the contact time and area between the limestone slurry and the flue gas, thereby deepening the desulfurization effect;

[0044] A liquid guide plate 46 is coaxially arranged on the scrubber 22, and the scrubber 22 is rotatably connected to the liquid guide plate 46. A drain pipe 47 is connected to the liquid guide plate 46, and the drain pipe can continuously discharge the excess limestone slurry in the scrubber.

[0045] In this embodiment, two liquid channels 54 are provided in the liquid supply main pipe 5, and the receiving chambers in the liquid supply seat 42 are independently provided. An internal sleeve 51 is slidably connected between the liquid supply seat 42 and the liquid supply main pipe 5. When one of the liquid channels 54 is connected to the receiving chamber 45, the other liquid channel 54 is connected to the other receiving chamber 45.

[0046] The liquid delivery pipes 43 are divided into two groups according to the specifications of the spray holes. Each group of the liquid delivery pipes 43 is connected to the corresponding cavities 45 respectively. The liquid delivery pipes can be divided into diffusion nozzles and jet nozzles according to the specifications and shapes of the spray holes. The diffusion nozzles are designed to disperse the limestone slurry into a larger range of mist spray, which can provide a wider coverage area and is conducive to forming a uniform mist liquid. For flue gas containing higher concentrations of pollutants or requiring deep purification, the strong penetrating power of the jet nozzle helps the slurry to penetrate deeply into the flue gas, avoiding the retention phenomenon caused by excessive flue gas concentration, thereby contacting and reacting with more pollutants and improving the purification efficiency.

[0047] As a preferred embodiment, a slot is provided on the inner sleeve 51 on one side close to the liquid supply main pipe 5, and a latch tooth 55 is provided at the end of the liquid supply main pipe 5. When the inner sleeve 51 slides toward the side of the liquid supply main pipe 5, the latch tooth 55 engages with the slot. At this time, the liquid supply main pipe 5 synchronously controls the liquid delivery seat 42 to rotate through the inner sleeve 51 to perform normal rolling scrubbing work.

[0048] In this embodiment, the two liquid channels 54 of the liquid supply main pipe 5 are symmetrically distributed at one end close to the inner sleeve 51, and the other ends of the two liquid channels 54 are cocentrically distributed; when the slots on the inner sleeve are disengaged from the latch teeth 55, the motor drive unit can be used to control the liquid supply main pipe to independently deflect and adjust the two liquid channels 54 to alternately connect with the cavity, thereby changing the spraying strategy;

[0049] The internal liquid channel 54 is connected to the outside of the pulse liquid pipe 53, and the external liquid channel 54 is sealed and connected to the steady flow chamber 52, that is, when the pulse liquid pipe is sprayed and washed through the diffusion nozzle, the steady flow chamber can be connected to the jet nozzle; at this time, a washing method with jet spray as the main and diffusion spray as the auxiliary is formed, so as to realize the desulfurization treatment of high-concentration flue gas; and when the pulse liquid pipe is sprayed and washed through the jet nozzle, the steady flow chamber can be connected to the diffusion nozzle; at this time, a washing method with diffusion spray as the main and spray jet as the auxiliary is formed, so as to realize the desulfurization treatment of medium and low-concentration flue gas; it ensures that there is both a strong jet impact penetrating into the flue gas and uniform coverage of the diffusion nozzle, so as to effectively increase the gas-liquid contact interface even in a high-velocity flue gas environment and accelerate the absorption reaction process of pollutants such as SO2.

[0050] In this embodiment, a method for treating flue gas in a thermal power plant comprises the following steps:

[0051] S1. Flue gas collection: collect and transport the flue gas from the thermal power plant through the flue gas pipeline, and reduce its temperature to a range suitable for purification after pre-cooling; if circulating water cooling, air cooling island or hybrid cooling system is used, it depends on the actual conditions. Circulating water cooling is usually carried out through a heat exchanger, which is more efficient but water quality treatment needs to be considered. Determine the cooling target temperature, which generally needs to be lowered to above the acid dew point temperature to avoid condensation of sulfuric acid vapor and corrosion of equipment, and at the same time, it needs to be lower than the upper limit of the optimal operating temperature of the purification device;

[0052] S2. Centrifugal pretreatment, pretreatment and separation of flue gas by centrifugal separator 12, so that the carried solid particles or droplets are separated from the gas under the combined action of gravity and centrifugal force; the separated flue gas enters the scrubbing bin 21 in the scrubbing unit 2 in sequence through the exhaust channels of the centrifugal separator 12, so that the corresponding scrubbing bin 21 scrubs and desulfurizes the flue gas, thereby removing sulfur dioxide in the flue gas through chemical reaction; for flue gas of different concentrations, a scrubbing method with jet spray as the main method and diffuse spray as the auxiliary method can be adopted to achieve desulfurization treatment of high-concentration flue gas; or a scrubbing method with diffuse spray as the main method and spray jet as the auxiliary method can be adopted to achieve desulfurization treatment of medium and low-concentration flue gas; at the same time, the spray flow rate, pressure intensity, etc. can be specifically adjusted according to the change of flue gas concentration;

[0053] S3. Denitration treatment, the flue gas after desulfurization is transported to the catalytic reduction device 15, and an appropriate method is selected according to the flue gas conditions to inject ammonia reducing agent, and react with nitrogen oxides at an appropriate temperature to convert them into harmless gases;

[0054] S4. Dust removal and purification, using high-voltage electric fields to charge dust particles and adsorb them on dust collecting plates, followed by activated carbon adsorption or other special chemical treatments, and continuous monitoring of flue gas emission pollutant concentrations in the later stages, combined with remote monitoring and data analysis platforms, to achieve real-time tracking of emission data and abnormal alarms to ensure compliance with environmental emission standards.

[0055] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flue gas treatment device for a thermal power plant, characterized in that: It comprises a reaction tube (1), a partition (14) being fixed horizontally in the middle of the reaction tube (1), the partition (14) dividing the reaction tube (1) into two upper and lower processing chambers, an air intake seat (11) being arranged in the lower processing chamber, an air intake pipe (13) being laterally connected to the outside of the air intake seat (11), a centrifugal separator (12) being sealedly connected below the air intake seat (11), the centrifugal separator (12) performing pre-treatment and separation on the flue gas; an air scrubber unit (2) is also arranged in the lower processing chamber, the air scrubber unit (2) comprising a plurality of air scrubber chambers (21) arranged laterally, Each gas washing bin (21) is provided with a gas washing cylinder (22), one end of which is provided with an air intake device (3), the air intake device (3) being connected to the exhaust passage of the centrifugal separator (12), a quantitative amount of limestone slurry being stored in the gas washing bin (21), a plurality of air vents (23) being provided on the side wall of the gas washing cylinder (22), the lower air vents (23) being immersed in the limestone slurry, liquid-retaining cotton being provided in the air vents (23), the gas washing unit (2) desulfurizing the flue gas by means of the limestone slurry, thereby removing sulfur oxides in the flue gas, thereby achieving a preliminary purification effect; A catalytic reduction device (15) is arranged in the treatment chamber located at the top, a transfer tube (19) is externally connected to the scrubbing unit (2), one end of the transfer tube (19) is connected to the air inlet end of the catalytic reduction device (15), and the catalytic reduction device (15) mixes ammonia as a reducing agent with the flue gas and reacts with the catalyst, thereby reducing nitrogen oxide emissions; An air guide bin (16) is arranged above the interior of the reaction tube (1), the air guide bin (16) is connected to the exhaust end of the catalytic reduction device (15), an exhaust tube (17) is vertically arranged above the air guide bin (16), and a fan blade (18) is installed in the exhaust tube (17); A spray assembly (4) is also provided in the scrubber (22), and the spray assembly (4) adaptively sprays limestone slurry in the scrubber (22) based on the flue gas concentration in the scrubber (22), so as to respond to changes in flue gas conditions in real time and maintain an efficient and stable desulfurization effect; An air pipe (24) is transversely connected to the air washing bin (21), and one end of the air pipe (24) is connected to the transfer pipe (19); The spray assembly (4) comprises a spray plate (41) having a liquid delivery seat (42) coaxially arranged therein, a plurality of liquid delivery pipes (43) arranged horizontally arranged on the circumference of the liquid delivery seat (42), and spray holes are arranged on the liquid delivery pipes (43); a positioning plate (44) is fixed in the air washer cylinder (22), and the liquid delivery pipes (43) are all fixed through the positioning plate (44); a liquid supply pipe (5) is installed on the spray plate (41), and the liquid supply pipe (5) is connected to each liquid delivery pipe (43) through a cavity (45) arranged in the liquid delivery seat (42); A motor drive unit is also provided on the spray plate (41), and the liquid supply pipe (5) and the liquid supply seat (42) are both rotatably connected to the spray plate (41), and the output end of the motor drive unit is transmission-connected to the liquid supply pipe (5) through gear meshing. Two liquid channels (54) are provided in the liquid supply main pipe (5), and the containing chambers in the liquid supply seat (42) are two independently arranged chambers. An internal connecting sleeve (51) is slidably connected between the liquid supply seat (42) and the liquid supply main pipe (5), and when one of the liquid channels (54) is connected to the containing chamber (45), the other liquid channel (54) is connected to the other containing chamber (45); The liquid delivery pipes (43) are divided into two groups according to the specifications of the spray holes, and each group of liquid delivery pipes (43) is connected to a corresponding cavity (45) respectively; A slot is provided on one side of the inner sleeve (51) close to the liquid supply main pipe (5), and a latching tooth (55) is provided at the end of the liquid supply main pipe (5). When the inner sleeve (51) slides toward the side of the liquid supply main pipe (5), the latching tooth (55) engages with the slot, and at this time, the liquid supply main pipe (5) is synchronously controlled by the inner sleeve (51) to rotate the liquid supply seat (42); The two liquid channels (54) of the liquid supply main pipe (5) are symmetrically distributed at one end close to the inner sleeve (51), while the other ends of the two liquid channels (54) are cocentrically distributed; The internal liquid channel (54) is externally connected to a pulse liquid pipe (53), and the external liquid channel (54) is externally sealed and connected to the flow stabilization chamber (52).

2. A flue gas treatment device for a thermal power plant according to claim 1, characterized in that: The air intake device (3) comprises a sealing seat (31), one end of which is connected to a fixed air seat (32), an inner chamber (35) is provided in the fixed air seat (32), a smoke pipe (36) is vertically connected to the inner chamber (35), and the smoke pipe (36) is connected to the centrifugal separator (12); a straight pipe (34) is horizontally connected to the sealing seat (31), one end of the straight pipe (34) is connected to the inner chamber (35), and the other end of the straight pipe (34) is connected to a diverter pipe (33); and a plurality of smoke holes are distributed circumferentially on the diverter pipe (33).

3. A flue gas treatment device for a thermal power plant according to claim 2, characterized in that: The inner diameter of each smoke hole on the diverter pipe (33) gradually increases toward the side away from the sealing seat (31).

4. The flue gas treatment device for a thermal power plant according to claim 1, characterized in that: The air washer (22) rotates synchronously with the liquid supply main pipe (5) to immerse the liquid-retaining cotton in the air vent (23) one by one in the limestone slurry; A liquid guide plate (46) is coaxially arranged on the gas washing cylinder (22). The gas washing cylinder (22) and the liquid guide plate (46) are rotatably connected in a sealed manner. A liquid drain pipe (47) is connected to the liquid guide plate (46).

5. A method for treating flue gas in a thermal power plant, which adopts a flue gas treatment device for a thermal power plant as claimed in any one of claims 1 to 4, characterized in that: It includes the following steps: S1. Flue gas collection: The flue gas from the thermal power plant is collected and transported through the flue gas pipeline, and its temperature is reduced to a range suitable for purification after pre-cooling; S2. Centrifugal pretreatment, pre-treating and separating the flue gas through a centrifugal separator (12), so that the carried solid particles or liquid droplets are separated from the gas under the combined action of gravity and centrifugal force; the separated flue gas passes through each exhaust channel of the centrifugal separator (12) and enters the scrubbing bin (21) in the scrubbing unit (2) in sequence, so that the corresponding scrubbing bin (21) scrubs and desulfurizes the flue gas, thereby removing sulfur dioxide in the flue gas through a chemical reaction; S3. Denitrification treatment, the flue gas after desulfurization is transported to the catalytic reduction device (15), and an appropriate method is selected according to the flue gas conditions to inject ammonia reducing agent, and react with nitrogen oxides at an appropriate temperature to convert them into harmless gases; S4. Dust removal and purification, using high voltage electric field to charge dust particles and adsorb them on dust collecting plates, followed by activated carbon adsorption or other special chemical treatment, and continuous monitoring of flue gas emission pollutant concentrations in the later stage.

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