A highly efficient and synergistic desulfurization and denitrification flue gas purification device for thermal power plants

Abstract

This invention discloses a high-efficiency synergistic desulfurization and denitrification flue gas purification device for thermal power plants. It includes multiple parallel synergistic purification mechanisms arranged sequentially along the flue gas flow direction and a dehydration-type exhaust tower. The dehydration-type exhaust tower and these parallel synergistic purification mechanisms are connected via a flue gas conveying pipeline system. The drain pipe of the dehydration-type exhaust tower and the liquid discharge pipe systems of each parallel synergistic purification mechanism are all connected to a residual liquid collection pipeline system. Desulfurization solution is pumped into at least one parallel synergistic purification mechanism, and denitrification solution is pumped into the remaining parallel synergistic purification mechanisms. This invention can divide the flue gas into multiple streams and simultaneously treat these streams, thereby ensuring that harmful substances in the flue gas are fully treated, achieving the goal of cost reduction and efficiency improvement. This invention is applicable to the technical field of desulfurization and denitrification in flue gas treatment of thermal power plants.

Description

Technical Field

[0001] This invention belongs to the technical field of flue gas treatment in thermal power plants, specifically, it relates to a highly efficient and synergistic desulfurization and denitrification flue gas purification device for thermal power plants. Background Technology

[0002] Thermal power plants generate heat by burning combustibles, which is then used to heat water to produce steam. This steam is continuously supplied to generator units, ultimately converting the steam into electricity. Common combustibles include coal and straw. During combustion, the resulting flue gas contains sulfides and nitrogen oxides, which, if directly released into the environment, would cause serious pollution. Therefore, flue gas purification is necessary to remove harmful substances and ensure that the emitted gases meet emission regulations. However, existing desulfurization and denitrification equipment is not ideal for flue gas purification, especially when the flue gas enters the treatment equipment as a whole. The equipment cannot ensure sufficient purification of large quantities of flue gas, meaning the flue gas is concentrated within the treatment equipment, preventing it from fully contacting and reacting with the spray liquid and / or catalyst. Therefore, there is an urgent need for a method that divides the flue gas into multiple streams and treats these streams simultaneously, ensuring that harmful substances in the flue gas are fully removed, thus achieving cost reduction and efficiency improvement. Summary of the Invention

[0003] This invention provides a highly efficient synergistic desulfurization and denitrification flue gas purification device for thermal power plants, which divides the flue gas into multiple streams and processes the flue gas of these streams simultaneously, thereby ensuring that harmful substances in the flue gas are fully treated and achieving the goal of cost reduction and efficiency improvement.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A high-efficiency synergistic desulfurization and denitrification flue gas purification device for thermal power plants includes multiple parallel synergistic purification mechanisms arranged sequentially along the flue gas flow direction and a dehydration flue gas tower. The dehydration flue gas tower and these parallel synergistic purification mechanisms are connected through a flue gas conveying pipeline system, and the drain pipe of the dehydration flue gas tower and the liquid discharge pipe system of each parallel synergistic purification mechanism are all connected to the residual liquid collection pipeline system. The desulfurization solution is pumped into at least one parallel synergistic purification mechanism, and the denitrification solution is pumped into the remaining parallel synergistic purification mechanisms.

[0006] Furthermore, the flue gas conveying pipeline system includes a flue gas inlet pipe connected to the inlet end of the foremost parallel-type co-purification mechanism, the outlet end of the parallel-type co-purification mechanism is connected to the inlet end of the adjacent parallel-type co-purification mechanism through a flue gas transfer pipe, and the inlet end of the dehydration exhaust tower is connected to the outlet end of the nearby parallel-type co-purification mechanism through a flue gas discharge pipe.

[0007] Furthermore, the parallel-path collaborative purification mechanism includes multiple branch purification units evenly arranged in a circumferential direction. The upper ends of these branch purification units are all connected to the liquid distribution pipe system, and the lower ends of these branch purification units are all connected to the liquid discharge pipe system. The smoke inlet pipe and smoke outlet pipe of each branch purification unit are all connected to the flue gas conveying pipe system.

[0008] Furthermore, the flue gas conveying pipeline system also includes a vertical flue gas guide pipe. The multiple branch purification units are evenly arranged along the circumference of the vertical flue gas guide pipe. The inlet and outlet pipes of these branch purification units are connected to the vertical flue gas guide pipe. The vertical flue gas guide pipe has a lower inlet duct and an upper outlet duct arranged sequentially upwards in the vertical direction. A flue gas control valve is installed on the vertical flue gas guide pipe. The lower inlet duct and the upper outlet duct are separated by the flue gas control valve. The lower end of the vertical flue gas guide pipe is connected to the corresponding flue gas inlet pipe or flue gas transfer pipe, and the upper end of the vertical flue gas guide pipe is connected to the corresponding flue gas transfer pipe or flue gas outlet pipe.

[0009] Furthermore, the branch purification unit includes a purification cylinder with a built-in elastic spiral exchanger. The purification chamber of the purification cylinder is divided into a lower smoke inlet chamber and an upper smoke outlet chamber by the elastic spiral exchanger. The lower smoke inlet duct and the upper smoke outlet duct are respectively connected to the lower smoke inlet chamber and the upper smoke outlet chamber. The outer wall of the elastic spiral exchanger is fixedly connected to the inner peripheral wall of the purification cylinder. A vertical liquid supply pipe is connected to the middle of the elastic spiral exchanger. The upper end of the vertical liquid supply pipe extends movably out of the purification cylinder and is connected to the liquid distribution pipe system.

[0010] Furthermore, the purification cylinder includes a cylindrical body with a drain connector pipe at the lower end, the drain connector pipe being connected to a drain pipe system. A smoke collection hood with a gradually decreasing diameter along the vertical direction is constructed at the upper end of the cylindrical body. A guide sleeve is constructed at the upper end of the smoke collection hood. One end of the smoke exhaust pipe is connected to the smoke collection hood, and the other end of the smoke exhaust pipe is inclined upward and connected to the upper exhaust duct. A spiral guide groove is constructed on the inner wall of the smoke exhaust pipe. The two ends of the spiral guide groove extend spirally along the axial direction of the smoke exhaust pipe to the upper smoke outlet chamber and the upper exhaust duct, respectively. One end of the smoke inlet pipe is connected to the lower smoke inlet chamber, and the other end of the smoke inlet pipe is inclined upward and connected to the lower smoke inlet duct.

[0011] Furthermore, the elastic volute exchanger includes a volute-shaped elastic spray element, which has a volute-shaped reaction channel and a hollow liquid distribution chamber. The liquid distribution chamber is connected to a vertical liquid supply pipe, and multiple spray holes that are uniformly opened on the elastic spray element and are all connected to the liquid distribution chamber.

[0012] Furthermore, the lower middle part of the elastic volute exchanger protrudes downward to form a lower convex part, and the upper middle part of the elastic volute exchanger protrudes upward to form an upper convex part.

[0013] Furthermore, the liquid distribution system includes an annular liquid distribution main pipe with multiple liquid distribution branch pipes evenly connected along its circumference, an inlet connector connected to the annular liquid distribution main pipe, the inlet connector being connected to the inlet main pipe, and a liquid distribution control valve installed on each liquid distribution branch pipe; two connecting seats are symmetrically constructed on the annular liquid distribution main pipe, and each connecting seat is connected to a fixed seat through a vertical driving component.

[0014] Furthermore, the dehydration-type flue gas tower includes a vertical tower body with an exhaust hood and a liquid collection hood respectively constructed at its upper and lower ends. An exhaust connector is constructed at the upper end of the exhaust hood, and an annular liquid discharge trough is constructed at the lower end of the liquid collection hood. The annular liquid discharge trough is connected to the residual liquid collection pipe system through a drain pipe. A flow guide hood with an upward protrusion in the middle is constructed at the lower end of the vertical tower body, and an air inlet connector is constructed in the middle of the flow guide hood. Multiple first flow-blocking plates and multiple second flow-blocking plates are arranged vertically in the dehydration chamber of the vertical tower body. The flow-blocking plates, namely the first flow-blocking plates and the second flow-blocking plates, are arranged alternately in a vertical direction. The outer peripheral wall of the first flow-blocking plate is fixed to the inner peripheral wall of the vertical tower body. A first air guide port is formed in the middle of the first flow-blocking plate, and the middle of the first flow-blocking plate gradually bulges downward. The outer peripheral wall of the second flow-blocking plate is fixed to the inner peripheral wall of the vertical tower body by multiple connecting rods. These connecting rods are evenly arranged in the circumference of the vertical tower body. A second air guide port is formed between two adjacent connecting rods, and the middle of the second flow-blocking plate gradually bulges upward.

[0015] The present invention, due to the aforementioned structure, achieves the following technological advancements compared to existing technologies: The present invention employs multiple parallel-path synergistic purification mechanisms to separately treat flue gas for desulfurization and denitrification. When there are two parallel-path synergistic purification mechanisms, one is used for desulfurization and the other for denitrification. When there are more than two parallel-path synergistic purification mechanisms, multi-stage separation and / or multi-stage denitrification of the flue gas can be performed. That is, at least two parallel-path synergistic purification mechanisms perform desulfurization of the flue gas, and / or at least two parallel-path synergistic purification mechanisms perform denitrification of the flue gas, ensuring that the flue gas is completely desulfurized before denitrification, or completely denitrified before desulfurization, thereby ensuring that sulfides and nitrogen oxides in the flue gas are completely purified. Furthermore, when the flue gas enters the parallel-flow co-processing purification mechanism, it is evenly divided into multiple parallel streams, and these streams are purified simultaneously, ensuring the efficiency of flue gas purification. Moreover, the reduced flow rate of the flue gas makes the purification efficiency and effectiveness more pronounced for low-flow-rate flue gas. The residual liquid collection system of this invention can collect the purified residual liquid from each parallel-flow co-processing purification mechanism. During the passage of the flue gas through the dehydration exhaust tower, the dehydration exhaust tower separates the water vapor carried in the flue gas, which is then recovered into the residual liquid collection system for subsequent treatment and recycling. In summary, by dividing the flue gas into multiple streams and simultaneously treating these streams, the harmful substances in the flue gas are fully treated, achieving the goal of cost reduction and efficiency improvement. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] In the attached diagram:

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0019] Figure 2 This is a side view of the structure according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the parallel-path collaborative purification mechanism according to an embodiment of the present invention;

[0021] Figure 4 This is an axial structural cross-sectional view of the parallel-path collaborative purification mechanism according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the branch purification unit in the parallel-type collaborative purification mechanism according to an embodiment of the present invention;

[0023] Figure 6This is a schematic diagram of the structure of the purification cylinder in the branch purification unit of this invention;

[0024] Figure 7 This is a schematic diagram of the connection between the elastic spiral exchanger and the vertical liquid supply pipe in the branch purification unit of this invention.

[0025] Figure 8 This is a front view of the structure connecting the elastic spiral exchanger and the vertical liquid supply pipe in the branch purification unit of this invention embodiment;

[0026] Figure 9 This is a schematic diagram of the liquid distribution pipeline system in the parallel-path collaborative purification mechanism of this invention.

[0027] Figure 10 This is a schematic diagram of the drainage pipe system in the parallel-path collaborative purification mechanism according to an embodiment of the present invention;

[0028] Figure 11 This is a schematic diagram of the structure of the dehydration smoke exhaust tower according to an embodiment of the present invention;

[0029] Figure 12 This is an axial structural cross-sectional view of the dehydration-type smoke exhaust tower according to an embodiment of the present invention.

[0030] Components labeled: 100-Branch purification unit, 101-Cylindrical body, 102-Drainage connector pipe, 103-Fume hood, 104-Guide sleeve, 105-Fume inlet pipe, 106-Fume exhaust pipe, 107-Spiral guide groove, 108-Purification chamber, 109-Vertical liquid supply pipe, 110-Elastic spray element, 111-Spray hole, 112-Reaction channel, 113-Lower protrusion, 114-Upper 115 - Handwheel, 116 - First quick connector, 200 - Dehydration-type flue gas tower, 201 - Vertical tower body, 202 - Dehydration chamber, 203 - Liquid collection hood, 204 - Flow guide hood, 205 - Air inlet connector, 206 - Annular drain trough, 207 - Exhaust hood, 208 - Exhaust connector, 209 - First baffle plate, 210 - First air guide port, 211 - Second baffle plate, 21 2-Second air inlet, 300-Flue gas conveying piping system, 301-Flue gas inlet pipe, 302-Flue gas transfer pipe, 303-Flue gas outlet pipe, 304-Vertical flue gas guide pipe, 305-Lower flue gas duct, 306-Upper flue gas duct, 307-Flue gas control valve, 400-Residual liquid collection piping system, 401-Residual liquid discharge main pipe, 402-Residual liquid discharge bypass pipe, 403-Drain pipe, 500- Liquid distribution piping system, 501-ring liquid distribution main pipe, 502-liquid inlet connector, 503-liquid inlet main pipe, 504-liquid distribution branch pipe, 505-liquid distribution control valve, 506-second quick connector, 507-connecting seat, 508-fixed seat, 509-vertical drive component, 600-drainage piping system, 601-drainage branch pipe, 602-connecting cover, 603-drainage control valve, 604-drainage main pipe. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0032] This invention discloses a highly efficient synergistic desulfurization and denitrification flue gas purification device for thermal power plants, such as... Figure 1-12 As shown, the system includes a dehydration flue gas tower 200, a flue gas conveying pipeline system 300, a residual liquid collection pipeline system 400, and multiple parallel-path co-purification mechanisms. The multiple parallel-path co-purification mechanisms and the dehydration flue gas tower 200 are arranged sequentially along the flue gas flow direction. The dehydration flue gas tower 200 and these parallel-path co-purification mechanisms are connected through the flue gas conveying pipeline system 300. The drain pipe 403 of the dehydration flue gas tower 200 and the liquid discharge pipeline systems 600 of each parallel-path co-purification mechanism are all connected to the residual liquid collection pipeline system 400. Desulfurization solution is pumped into at least one parallel-path co-purification mechanism to neutralize sulfides in the flue gas; denitrification solution is pumped into the remaining parallel-path co-purification mechanisms to neutralize nitrogen oxides in the flue gas. The working principle and advantages of this invention are as follows: This invention employs multiple parallel-path synergistic purification mechanisms to separately treat flue gas for desulfurization and denitrification. When there are two parallel-path synergistic purification mechanisms, one is used for desulfurization and the other for denitrification. When there are more than two parallel-path synergistic purification mechanisms, multi-stage separation and / or multi-stage denitrification of the flue gas can be performed. That is, at least two parallel-path synergistic purification mechanisms perform desulfurization of the flue gas, and / or at least two parallel-path synergistic purification mechanisms perform denitrification of the flue gas, ensuring that the flue gas is completely desulfurized before denitrification, or completely denitrified before desulfurization, thereby ensuring that sulfides and nitrogen oxides in the flue gas are completely purified. Moreover, when the flue gas enters the parallel-path synergistic purification mechanism, the flue gas is evenly divided into multiple parallel branches, and the flue gas in these branches is purified simultaneously, ensuring the efficiency of flue gas purification. Furthermore, the flow rate of the flue gas is reduced, and the purification efficiency and effect of low-flow flue gas are more prominent during purification. The residual liquid collection system 400 of this invention can collect the purified residual liquid from each parallel-type collaborative purification mechanism. Furthermore, during the passage of flue gas through the dehydration exhaust tower 200, the dehydration exhaust tower 200 separates the water vapor carried in the flue gas, which is then recovered into the residual liquid collection system 400 for subsequent treatment and recycling. In summary, this invention can divide the flue gas into multiple streams and treat these streams simultaneously, thereby ensuring that harmful substances in the flue gas are fully treated, achieving the goal of cost reduction and efficiency improvement.

[0033] As a preferred embodiment of the present invention, such as Figure 1 , 2As shown, the flue gas conveying pipeline system 300 includes a flue gas inlet pipe 301, a flue gas transfer pipe 302, and a flue gas outlet pipe 303. The flue gas inlet pipe 301 is connected to the inlet of the foremost parallel-type co-processing purification mechanism, and the outlet of the last parallel-type co-processing purification mechanism is connected to the inlet of the dehydration exhaust tower 200 via the flue gas outlet pipe 303. The flue gas transfer pipe 302 is positioned between two adjacent parallel-type co-processing purification mechanisms, with its inlet and outlet connected to the outlet of the upper parallel-type co-processing purification mechanism and the inlet of the lower parallel-type co-processing purification mechanism, respectively. This invention, through the flue gas conveying pipeline system 300 connected sequentially via various parallel-type co-processing purification mechanisms and the dehydration exhaust tower 200, allows the flue gas to pass through each processing device sequentially during its passage through the flue gas conveying pipeline system 300, resulting in step-by-step purification of the flue gas and achieving continuous flue gas purification. The residual liquid collection system 400 in this embodiment includes a residual liquid discharge main pipe 401, a residual liquid discharge bypass pipe 402, and a drain pipe 403. The residual liquid discharge main pipe 401 is connected to the drainage pipe systems 600 of each parallel-type co-processing purification unit. The dehydration-type flue gas tower 200 is connected to the residual liquid discharge main pipe 401 via the drain pipe 403. The residual liquid discharge bypass pipe 402 is connected in parallel to one or more parallel-type co-processing purification units on the residual liquid discharge main pipe 401, bypassing the parallel-type co-processing purification units connected to it. Thus, when the flue gas volume is small, some parallel-type co-processing purification units can be shut down, and the residual liquid discharge bypass pipe 402 can ensure the residual liquid transport of the operating parallel-type co-processing purification units. Afterwards, the residual liquid and condensate are collected and subjected to appropriate purification treatment.

[0034] As a preferred embodiment of the present invention, such as Figure 3 , 4As shown, the parallel-path collaborative purification mechanism includes a liquid distribution pipe system 500, the aforementioned liquid discharge pipe system 600, and multiple branch purification units 100. These branch purification units 100 are evenly arranged circumferentially. The upper ends of each branch purification unit 100 are connected to the liquid distribution pipe system 500, and the lower ends of each branch purification unit 100 are connected to the liquid discharge pipe system 600. Each branch purification unit 100 has a smoke inlet pipe 105 and a smoke outlet pipe 106, both of which are connected to the flue gas conveying pipe system 300. In this embodiment, the flue gas conveying pipe system 300 also includes a vertical flue gas guide pipe 304. The multiple branch purification units 100 are evenly arranged circumferentially along the vertical flue gas guide pipe 304, and the smoke inlet pipes 105 and smoke outlet pipes 106 of each branch purification unit 100 are connected to the vertical flue gas guide pipe 304. Specifically, the vertical flue gas conduit 304 has a lower flue gas inlet 305 and an upper flue gas outlet 306 arranged sequentially upwards in the vertical direction. A flue gas control valve 307 is installed on the vertical flue gas conduit 304. The lower flue gas inlet 305 and the upper flue gas outlet 306 are separated by the flue gas control valve 307. The lower end of the vertical flue gas conduit 304 is connected to the corresponding flue gas inlet pipe 301 or flue gas transfer pipe 302, and the upper end of the vertical flue gas conduit 304 is connected to the corresponding flue gas transfer pipe 302 or flue gas outlet pipe 303. The working principle and advantages of this embodiment are as follows: When the flue gas control valve 307 is in the closed state, the lower flue duct 305 and the upper flue duct 306 are isolated from each other. The flue gas enters the lower flue duct 305 from the lower end of the vertical flue gas guide pipe 304. In this way, the flue gas enters the respective branch purification unit 100 through the flue gas inlet pipe 105. After being purified by the branch purification unit 100, the flue gas enters the upper flue duct 306 through the flue gas outlet pipe 106 and is then discharged from the upper end of the vertical flue gas guide pipe 304. This embodiment can also control the opening of the flue gas control valve 307, so that part of the flue gas enters each branch purification unit 100, and another part of the flue gas directly enters the next parallel-type collaborative purification mechanism through the vertical flue gas guide pipe 304, achieving the purpose of primary diversion; moreover, the flue gas purified by the branch purification unit 100 mixes with the unpurified flue gas at the upper exhaust flue 306 and enters the next parallel-type collaborative purification mechanism for purification; when the flue gas volume is large, it can reduce the load of the parallel-type collaborative purification mechanism while ensuring that the flue gas can be fully purified, and when the purified and unpurified flue gas mixes and enters the lower parallel-type collaborative purification mechanism, the content of harmful substances in the mixed flue gas is relatively low, and the lower parallel-type collaborative purification mechanism can fully purify the mixed flue gas. In this embodiment, a control valve is installed on each smoke inlet pipe 105 and smoke outlet pipe 106. By controlling the opening and closing of the smoke inlet pipe 105 and the corresponding smoke outlet pipe 106, the purpose of isolating the corresponding branch purification unit 100 is achieved, so that the amount of flue gas entering the parallel-type collaborative purification mechanism is adjusted, thereby adapting to the purification of flue gas with different flow rates.In this embodiment, the flue gas control valve 307 can also be fully opened, and the control valves on all the inlet pipes 105 and all the exhaust pipes 106 on the corresponding parallel-type collaborative purification mechanism can be closed, so that the flue gas does not enter any branch purification unit 100 on the parallel-type collaborative purification mechanism, and the flue gas directly crosses the parallel-type collaborative purification mechanism and enters the lower parallel-type collaborative purification mechanism or the dehydration exhaust tower 200; when the flue gas volume is low, the equipment wear is reduced while ensuring that the flue gas is fully purified.

[0035] As a preferred embodiment of the present invention, such as Figure 4-7As shown, the branch purification unit 100 includes a purification cylinder, an elastic spiral heat exchanger, and a vertical liquid supply pipe 109. The elastic spiral heat exchanger is disposed on the inner wall of the purification cylinder, dividing the purification chamber 108 of the purification cylinder into a lower smoke inlet chamber and an upper smoke outlet chamber. The lower smoke inlet duct 305 and the upper smoke outlet duct 306 are respectively connected to the lower smoke inlet chamber and the upper smoke outlet chamber. The outer wall of the elastic spiral heat exchanger is fixedly connected to the inner peripheral wall of the purification cylinder. The vertical liquid supply pipe 109 is connected to the middle of the elastic spiral heat exchanger, and its upper end extends movably out of the purification cylinder and is connected to the liquid distribution pipe system 500. The desulfurization solution or denitrification solution enters the vertical supply pipe 109 through the distribution pipe system 500, and then is sprayed out through the elastic volute exchanger. Thus, as the flue gas enters the upper outlet chamber from the lower inlet chamber via the elastic volute exchanger, it mixes with the atomized desulfurization solution or denitrification solution, causing it to react with the sulfides or nitrogen oxides in the flue gas, thereby achieving purification. The purification cylinder in this embodiment includes a cylindrical body 101. A drain connector pipe 102 is constructed at the lower end of the cylindrical body 101, and the drain connector pipe 102 is connected to the drain pipe system 600. A smoke collection hood 103 is constructed at the upper end of the cylindrical body 101. The smoke collection hood 103 gradually narrows in diameter upwards in the vertical direction. A guide sleeve 104 is constructed at the upper end of the smoke collection hood 103, and the lower end of the vertical supply pipe 109 passes through the guide sleeve 104 and extends into the cylindrical body 101. In this embodiment, one end of the exhaust pipe 106 is connected to the smoke collection hood 103, and the other end of the exhaust pipe 106 is inclined upward and connected to the upper exhaust duct 306. A spiral guide groove 107 is constructed on the inner wall of the exhaust pipe 106. The two ends of the spiral guide groove 107 extend spirally along the axial direction of the exhaust pipe 106 to the upper smoke outlet chamber and the upper exhaust duct 306, respectively. The purified flue gas enters the upper exhaust duct 306 through the exhaust pipe 106 from the upper smoke outlet chamber. During this process, the flue gas generates a swirling flow through the spiral guide groove 107. Under the action of centrifugal force, the moisture in the flue gas gradually falls onto the inner wall of the exhaust pipe 106. A portion of the moisture moves downward through the inner wall of the exhaust pipe 106, and another portion of the moisture enters the spiral guide groove 107 and gradually moves towards the cylindrical body 101. Both portions of moisture enter the cylindrical body 101, thereby reducing the humidity of the discharged flue gas. In this embodiment, the spiral guide groove 107 not only serves to swirl water but also provides a guiding effect for some of the moisture, promoting the rapid exit of moisture from the exhaust pipe 106. In this embodiment, one end of the smoke inlet pipe 105 is connected to the lower smoke inlet chamber, and the other end of the smoke inlet pipe 105 is inclined upward and connected to the lower smoke inlet duct 305. Because the smoke inlet pipe 105 is inclined, water droplets falling from the upper part of the cylindrical body 101 are prevented from entering the lower smoke inlet duct 305 through the smoke inlet pipe 105.

[0036] As a preferred embodiment of the present invention, such as Figure 7 , 8As shown, the elastic spiral exchanger includes a spiral-shaped elastic spray element 110. The elastic spray element 110 has a spiral-shaped reaction channel 112 that connects the lower smoke inlet chamber and the upper smoke outlet chamber. The elastic spray element 110 also has a hollow liquid distribution chamber that is connected to a vertical liquid supply pipe 109. Multiple spray holes 111 are evenly distributed on the elastic spray element 110, and all of these spray holes 111 are connected to the liquid distribution chamber. In this embodiment, an operating handwheel 115 is fixed to the upper part of the vertical liquid supply pipe 109, and the upper end of the vertical liquid supply pipe 109 is rotatably connected to the liquid distribution pipe system 500. The working principle and advantages of this embodiment are as follows: when the flue gas passes through the reaction channel 112 from the lower flue gas inlet chamber, the atomized liquid sprayed from the spray hole 111 fully contacts and reacts with the flue gas, thereby achieving the purpose of flue gas purification; moreover, since the reaction channel 112 is spiral-shaped, the flue gas passes through the reaction channel 112 in a three-dimensional and continuous manner, avoiding the situation of flue gas being torn or blocked, thus ensuring that the flue gas fully and three-dimensionally contacts and reacts with the purification liquid, so that the flue gas is purified efficiently and fully. After a period of use, some dirt and crystals will adhere to the surface of the elastic spray element 110. In this embodiment, by turning the operating handwheel 115, the vertical liquid supply pipe 109 drives the center of the elastic spray element 110 to twist elastically at a certain angle, thereby causing the elastic spray element 110 to undergo a certain degree of elastic twisting from the center outward. Then, by turning the operating handwheel 115 back a certain angle, the twist of the elastic spray element 110 gradually returns to its original position. This operation is repeated many times. During the deformation process of the elastic spray element 110, the dirt and crystals adhering to it will gradually fall off, thereby achieving the purpose of cleaning the elastic spray element 110 and ensuring the unobstructed flow of the reaction channel 112. This embodiment also allows for adjustment of the diameter of the reaction channel 112. Specifically, the vertical supply pipe 109 is rotated a certain angle in either the forward or reverse direction, and the middle of the elastic spray element 110 is twisted a certain angle in either the forward or reverse direction. As the elastic spray element 110 deforms, the diameter of the reaction channel 112 also changes. After adjustment, the vertical supply pipe 109 and the distribution pipe system 500 are fixed. This is achieved by installing a locking bolt at the connection between the vertical supply pipe 109 and the distribution pipe system 500. Tightening the locking bolt locks the connection between the vertical supply pipe 109 and the distribution pipe system 500, thus preventing the elastic spray element 110 from returning to its original position under the action of elastic force. In this embodiment, the lower middle part of the elastic spiral exchanger protrudes downwards to form a lower protrusion 113, and the upper middle part of the elastic spiral exchanger protrudes upwards to form an upper protrusion 114.As the flue gas moves upward in a unidirectional, localized manner upon entering the lower flue gas chamber, it gradually disperses during this movement. Under the action of the lower protrusion 113, the flue gas is evenly distributed into the reaction channel 112 in an outward-spreading manner. Moreover, the amount of flue gas decreases from the middle of the elastic volute exchanger outwards. Due to the use of the lower protrusion 113 and the upper protrusion 114, the elastic volute exchanger ensures that different amounts of flue gas are efficiently purified at different positions as they pass through the elastic volute exchanger. Furthermore, due to the setting of the upper protrusion 114, the flue gas also exits the reaction channel 112 in an outward-spreading manner, increasing the residence time of the flue gas in the upper flue gas chamber and providing sufficient time for the condensation of water vapor carried in the flue gas.

[0037] As a preferred embodiment of the present invention, such as Figure 4 , 5 As shown in Figure 9, the liquid distribution system 500 includes an annular liquid distribution main pipe 501, a liquid inlet main pipe 503, and multiple liquid distribution branch pipes 504. These liquid distribution branch pipes 504 are evenly arranged along the circumference of the annular liquid distribution main pipe 501. Each liquid distribution branch pipe 504 is connected to the annular liquid distribution main pipe 501. A liquid inlet connector 502 is connected to the annular liquid distribution main pipe 501. The liquid inlet connector 502 is connected to the liquid inlet main pipe 503. A liquid distribution control valve 505 is installed on each liquid distribution branch pipe 504. In this embodiment, a first quick connector 116 is constructed at the upper end of the vertical liquid supply pipe 109, and a second quick connector 506 is constructed at the lower end of the liquid distribution branch pipe 504. The first quick connector 116 and the second quick connector 506 are rotatably connected together, and the aforementioned locking bolt is threaded onto the outer peripheral wall of the first quick connector 116. By tightening the locking bolt, its end is tightly pressed against the second quick connector 506, thereby achieving the purpose of locking the first quick connector 116 and the second quick connector 506. The desulfurization solution or denitrification solution enters the annular liquid distribution main pipe 501 through the liquid inlet connector 502 from the liquid inlet main pipe 503, and is then evenly distributed to each liquid distribution branch pipe 504, and finally supplied to each elastic spiral exchanger by each vertical liquid supply pipe 109. In this embodiment, two connecting seats 507 are symmetrically constructed on the annular liquid distribution main pipe 501. Each connecting seat 507 is connected to the fixed seat 508 through a vertical driving component 509, which is generally a cylinder or a hydraulic cylinder. In this embodiment, by controlling the vertical movement of the vertical drive member 509, it drives the elastic volute exchanger to undergo vertical deformation through the vertical liquid supply pipe 109. In this way, the downward convexity of the lower convex portion 113 and the upward convexity of the upper convex portion 114 of the elastic volute exchanger are changed, thereby adjusting the dispersion effect of the flue gas by the action of the elastic volute exchanger, improving the purification effect of the flue gas and the condensation effect of water vapor in the flue gas.

[0038] As a preferred embodiment of the present invention, such as Figure 4 , 10As shown, the drainage system 600 includes a main drainage pipe 604 and multiple branch drainage pipes 601. The lower ends of these branch drainage pipes 601 are connected to the upper part of the main drainage pipe 604. The lower end of the main drainage pipe 604 is connected to the residual liquid collection system 400. The upper end of each branch drainage pipe 601 extends upward at an incline. A connecting cap 602 is constructed at the upper end of the branch drainage pipe 601. The connecting cap 602 is connected to the lower end of the corresponding drainage connector pipe 102. The branch drainage pipe 601 and the drainage connector pipe 102 are interconnected. A drainage control valve 603 is installed on the branch drainage pipe 601. Condensate, reaction residue, etc. in the purification cylinder enter the branch drainage pipe 601 through the drainage connector pipe 102, and then enter the residual liquid collection system 400.

[0039] As a preferred embodiment of the present invention, such as Figure 11 , 12As shown, the dehydration flue gas tower 200 includes a vertical tower body 201. An exhaust hood 207 and a liquid collection hood 203 are respectively constructed at the upper and lower ends of the vertical tower body 201. An exhaust connector 208 is constructed at the upper end of the exhaust hood 207, and an annular drain trough 206 is constructed at the lower end of the liquid collection hood 203. The annular drain trough 206 is connected to the residual liquid collection pipe system 400 through a drain pipe 403. A flow guide hood 204 is constructed at the lower end of the vertical tower body 201. The middle part of the flow guide hood 204 protrudes upwards to ensure that condensate falls onto the flow guide hood 204 and smoothly enters the annular drain trough 206. An air inlet connector 205 is constructed in the middle of the flow guide hood 204, through which the purified flue gas enters the vertical tower body 201. In this embodiment, multiple first flow-blocking discs 209 and multiple second flow-blocking discs 211 are arranged vertically in the dehydration chamber 202 of the vertical tower body 201. These first flow-blocking discs 209 and these second flow-blocking discs 211 are arranged alternately in the vertical direction, and the second flow-blocking disc 211 is located at the bottom to prevent condensate from entering the air inlet connector 205. In this embodiment, the outer peripheral wall of the first flow-blocking plate 209 is fixed to the inner peripheral wall of the vertical tower body 201. A first air guide port 210 is formed in the middle of the first flow-blocking plate 209, and the middle of the first flow-blocking plate 209 gradually bulges downward. The lower part of the first flow-blocking plate 209 can effectively block the flue gas, thereby reducing the flow rate of the flue gas and promoting the condensation of water vapor. When the flue gas comes into contact with the lower end surface of the first flow-blocking plate 209, the water vapor can effectively adhere to the lower end surface of the first flow-blocking plate 209 and then gradually accumulate at the first air guide port 210 before falling. After the water vapor condenses above the first flow-blocking plate 209, it falls directly onto the upper end surface of the first flow-blocking plate 209, or falls onto the upper end surface of the first flow-blocking plate 209 through the inner wall of the vertical tower body 201. Then, under the action of gravity, it accumulates at the first air guide port 210 and falls. In this embodiment, the outer peripheral wall of the second baffle plate 211 is fixed to the inner peripheral wall of the vertical tower body 201 by multiple connecting rods. These connecting rods are evenly arranged along the circumference of the vertical tower body 201, and a second air guide port 212 is formed between two adjacent connecting rods. The middle part of the second baffle plate 211 gradually bulges upward. During the process of flue gas passing through the second baffle plate 211, the flue gas comes into contact with the lower end surface of the second baffle plate 211, causing water vapor to condense on the lower end surface of the second baffle plate 211. Under the action of gravity, the water vapor moves towards the outer edge of the second baffle plate 211 until it falls. The water vapor located above the second baffle plate 211 condenses and falls on the upper end surface of the second baffle plate 211. Under the action of gravity, water droplets fall at the second air guide port 212. In this embodiment, multiple first flow-blocking discs 209 and multiple second flow-blocking discs 211 are alternately arranged, which causes the flue gas to be redirected and dissipated as it passes through the vertical tower body 201, thereby increasing the condensation time of water vapor and increasing the water vapor attachment surface, thus ensuring sufficient separation of water vapor.

[0040] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A highly efficient synergistic desulfurization and denitrification flue gas purification device for thermal power plants, characterized in that: The application relates to a parallel flow type cooperative purification mechanism and a dehydration type smoke exhaust tower, wherein the smoke exhaust tower and the parallel flow type cooperative purification mechanism are communicated through a smoke conveying pipe system, the drainage pipe of the smoke exhaust tower and the liquid drainage pipe system of each parallel flow type cooperative purification mechanism are communicated with a residual liquid collecting pipe system, a desulfurization solution pump is arranged in at least one parallel flow type cooperative purification mechanism, and a denitration solution pump is arranged in the remaining parallel flow type cooperative purification mechanisms; the smoke conveying pipe system comprises a smoke inlet pipe which is communicated with the inlet end of the frontmost parallel flow type cooperative purification mechanism, the outlet end of the parallel flow type cooperative purification mechanism is communicated with the inlet end of the adjacent parallel flow type cooperative purification mechanism through a smoke switching pipe, and the inlet end of the smoke exhaust tower is communicated with the outlet end of the adjacent parallel flow type cooperative purification mechanism through a smoke exhaust pipe; the parallel flow type cooperative purification mechanism comprises a plurality of branch purification units which are uniformly arranged in the circumferential direction, the upper end of the branch purification unit is communicated with a liquid distribution pipe system, the lower end of the branch purification unit is communicated with a liquid drainage pipe system, and the smoke inlet pipe and the smoke exhaust pipe of each branch purification unit are communicated with the smoke conveying pipe system; the smoke conveying pipe system further comprises a vertical smoke guide pipe, the plurality of branch purification units are uniformly arranged along the circumferential direction of the vertical smoke guide pipe, the smoke inlet pipe and the smoke exhaust pipe of the branch purification unit are communicated with the vertical smoke guide pipe, the vertical smoke guide pipe has a lower smoke inlet channel and an upper smoke exhaust channel which are sequentially arranged in the vertical direction, the branch purification unit comprises a purification cylinder which is internally provided with an elastic spiral-shaped exchanger, the purification cavity of the purification cylinder is divided into a lower smoke inlet cavity and an upper smoke outlet cavity through the elastic spiral-shaped exchanger, the lower smoke inlet channel and the upper smoke exhaust channel are respectively communicated with the lower smoke inlet cavity and the upper smoke outlet cavity, the outer wall of the elastic spiral-shaped exchanger is fixedly connected with the inner circumferential wall of the purification cylinder, a vertical liquid supply pipe is communicated with the middle part of the elastic spiral-shaped exchanger, the upper end of the vertical liquid supply pipe is movably extended out of the purification cylinder and is communicated with the liquid distribution pipe system, the elastic spiral-shaped exchanger comprises an elastic spraying piece in the shape of a spiral line, the elastic spraying piece has a spiral line-shaped reaction channel, the elastic spraying piece has a hollow liquid distribution cavity, the liquid distribution cavity is communicated with the vertical liquid supply pipe, a plurality of spraying holes which are communicated with the liquid distribution cavity are uniformly arranged on the elastic spraying piece, the lower middle part of the elastic spiral-shaped exchanger is downwardly protruded and forms a lower protruding part, and the upper middle part of the elastic spiral-shaped exchanger is upwardly protruded and forms an upper protruding part.

2. The high-efficiency synergistic desulfurization and denitrification flue gas purification device for thermal power plants according to claim 1, characterized in that: A smoke control valve is arranged on the vertical smoke guide pipe, the lower smoke inlet channel and the upper smoke exhaust channel are separated through the smoke control valve, the lower end of the vertical smoke guide pipe is communicated with the corresponding smoke inlet pipe or smoke switching pipe, and the upper end of the vertical smoke guide pipe is communicated with the corresponding smoke switching pipe or smoke exhaust pipe.

3. The high-efficiency synergistic desulfurization and denitrification flue gas purification device for thermal power plants according to claim 1, characterized in that: The purification cylinder comprises a cylindrical body with a liquid discharge connector pipe arranged at the lower end, the liquid discharge connector pipe being communicated with a liquid discharge pipe system, a smoke collecting hood tapering in diameter upward in the vertical direction being arranged at the upper end of the cylindrical body, a guide sleeve being arranged at the upper end of the smoke collecting hood, one end of the smoke discharge pipe being connected with the smoke collecting hood, the other end of the smoke discharge pipe being inclined upward and communicated with an upper smoke discharge channel, a spiral flow guide groove being arranged on the inner wall of the smoke discharge pipe, two ends of the spiral flow guide groove being respectively spirally extended to the upper smoke outlet cavity and the upper smoke discharge channel along the axial direction of the smoke discharge pipe, one end of the smoke inlet pipe being communicated with the lower smoke inlet cavity, the other end of the smoke inlet pipe being inclined upward and communicated with a lower smoke inlet channel.

4. The high-efficiency synergistic desulfurization and denitrification flue gas purification device for thermal power plants according to claim 1, characterized in that: The liquid distribution pipe system comprises an annular liquid distribution main pipe with a plurality of liquid distribution branch pipes uniformly communicated along the circumferential direction, a liquid inlet connector being communicated with the liquid distribution main pipe, a liquid distribution control valve being arranged on each liquid distribution branch pipe; two connecting seats being symmetrically arranged on the liquid distribution main pipe, each connecting seat being connected with a fixed seat through a vertical driving member.

5. The high-efficiency synergistic desulfurization and denitrification flue gas purification device for thermal power plants according to claim 1, characterized in that: The dehydration type smoke discharge tower comprises a vertical tower body with an exhaust hood and a liquid collecting hood arranged at the upper end and the lower end respectively, an exhaust connector being arranged at the upper end of the exhaust hood, an annular liquid discharge groove being arranged at the lower end of the liquid collecting hood, the annular liquid discharge groove being communicated with a residual liquid collection pipe system through a drainage pipe, a flow guide hood being arranged at the lower end of the vertical tower body, the flow guide hood being convex upward in the middle part, an air inlet connector being arranged in the middle part of the flow guide hood, a plurality of first flow resistance discs and a plurality of second flow resistance discs being arranged in the vertical direction in the dehydration cavity of the vertical tower body, the first flow resistance discs and the second flow resistance discs being alternately arranged in the vertical direction; the outer peripheral wall of the first flow resistance disc is fixed with the inner peripheral wall of the vertical tower body, the middle part of the first flow resistance disc is formed with a first air guide opening, and the middle part of the first flow resistance disc is gradually convex downward; the outer peripheral wall of the second flow resistance disc is fixed with the inner peripheral wall of the vertical tower body through a plurality of connecting rods, the connecting rods being uniformly arranged along the circumferential direction of the vertical tower body, a second air guide opening being formed between two adjacent connecting rods, and the middle part of the second flow resistance disc is gradually convex upward.

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