Tail gas treatment system for waste incineration power plant

Abstract

The invention relates to the technical field of tail gas treatment, and discloses a waste incineration power plant tail gas treatment system which comprises a cooling device, a reaction device and a dust removal device which are sequentially communicated with tail gas. The cooling device comprises a foundation frame, a clamping plate and a cooling pipe; the two clamping plates are parallel to each other, and a driving assembly for driving the two clamping plates to move in the direction close to each other or away from each other in the same straight line direction is arranged on the foundation frame. The number of the cooling pipes is two, each cooling pipe comprises a first water conveying section, a bent section and a second water conveying section which are communicated in sequence, and the bent section is arranged in a winding mode from the first water conveying section to the direction close to the second water conveying section; a rotating assembly for driving the cooling pipe to rotate along the axis of the first water conveying section is arranged on the foundation frame, so that the cooling pipe is switched between a first state and a second state corresponding to the cooling pipe; the first state and the second state of the cooling pipe are mirrored along the axis of the first water conveying section. According to the invention, the cooling effect of the cooling pipe is not easy to reduce.

Description

Technical Field

[0001] The present application relates to the technical field of tail gas treatment, and in particular to a tail gas treatment system for a waste incineration power plant. Background Art

[0002] With the acceleration of global urbanization, the amount of urban domestic waste is increasing. Waste incineration power generation has been widely used as an important way to reduce and recycle waste. However, the waste incineration process will produce a large amount of tail gas containing particulate matter, acidic gases (HCl, HF), dioxins and other atmospheric pollutants. If it is directly discharged into the atmosphere without effective treatment, it will pose a serious threat to human health and the ecological environment. Therefore, it is necessary to treat the tail gas generated by waste incineration through a tail gas treatment system.

[0003] The existing method of treating tail gas from waste incineration is usually to first cool the tail gas, then send the tail gas to a reaction tower sprayed or stored with slaked lime slurry, and the tail gas after the reaction enters a dust collector and is discharged through a chimney. For example, a Chinese patent document with publication number CN117398829A discloses a tail gas treatment system for a waste incineration power plant, including a cooling chamber, a neutralization chamber, an activated carbon chamber and a bag filter connected in sequence.

[0004] Among them, when the exhaust gas is cooled, a cooling pipe with circulated water flow in the cooling chamber is usually used, and the exhaust gas passes through the outer wall of the cooling pipe for heat exchange. However, since the exhaust gas contains a lot of particulate matter, some of the particulate matter will adhere to the outer wall of the cooling pipe when the exhaust gas is transmitted in the cooling chamber. As the number of impurity particles increases, the heat exchange effect between the exhaust gas and the cooling pipe is easily reduced, resulting in a cooling effect that is not as good as expected, affecting the exhaust gas treatment effect. Summary of the invention

[0005] In order to prevent the cooling effect of the cooling pipe from being reduced, the present application provides an exhaust gas treatment system for a waste incineration power plant.

[0006] The present application provides a waste incineration power plant tail gas treatment system, which adopts the following technical solutions: A waste incineration power plant tail gas treatment system, comprising: a cooling device, a reaction device and a dust removal device connected to the tail gas in sequence; the cooling device comprises a base frame, a clamping plate and a cooling pipe; There are two clamping plates, the two clamping plates are parallel to each other, and the base frame has a driving component for driving the two clamping plates to move toward or away from each other along the same straight line direction; There are two cooling pipes, each of which comprises a first water delivery section, a curved section and a second water delivery section which are connected in sequence, and the curved section is arranged in a winding direction from the first water delivery section to the second water delivery section; the first water delivery section and the second water delivery section of the same cooling pipe are coaxially rotatably connected to the base frame, and the two cooling pipes are parallel to each other and located between the two clamping plates; The base frame has a rotating assembly for driving the cooling pipe to rotate along the axis of the first water delivery section, so that the cooling pipe switches between a first state and a second state corresponding to itself; the first state and the second state of the cooling pipe are mirror images along the axis of the first water delivery section; The first state is characterized by the two clamping plates being able to clamp the two cooling tubes at the same time, so that the cooling tubes and the clamping plates together form a first cooling channel; the second state is characterized by the two clamping plates being able to clamp the two cooling tubes at the same time, so that the cooling tubes and the clamping plates together form a second cooling channel; the first cooling channel and the second cooling channel are both used for cooling the exhaust gas; and the side of the cooling tube facing away from the first cooling channel is opposite to the second cooling channel.

[0007] By adopting the above technical solution, two winding cooling tubes are clamped by two clamping plates to form a switchable first cooling channel and a second cooling channel, so that the exhaust gas can pass through different cooling channels, thereby preventing particulate matter from adhering to the same position of the cooling tube for a long time, thereby reducing the heat exchange effect.

[0008] Optionally, the exhaust gas treatment system further includes an air inlet pipe and an air outlet pipe, wherein the air inlet pipe is used to input the exhaust gas and extends between the two first water delivery sections, and the air outlet pipe is used to discharge the exhaust gas and extends between the two second water delivery sections.

[0009] Optionally, a temperature sensor is provided in the outlet pipe and a valve is provided on the inlet pipe; the temperature sensor controls the valve, the drive component and the rotating component, and when the temperature sensed by the temperature sensor is higher than a set value, the valve closes the inlet pipe, and at the same time, the drive component and the rotating component link the cooling pipe to switch the state.

[0010] By adopting the above technical solution, through the linkage control of temperature sensors, valves, drive components and rotating components, real-time monitoring of exhaust gas temperature and intelligent switching of cooling devices are realized. When the exhaust gas temperature is higher than the set value, the system will automatically close the intake pipe and switch the state of the cooling pipe, so that the exhaust gas can be fully cooled.

[0011] Optionally, the driving assembly includes a bidirectional screw, a guide rod and a driving source; the bidirectional screw is rotatably connected to the basic frame, the guide rod is connected to the basic frame and is parallel to the bidirectional screw, and the driving source is installed on the basic frame to drive the bidirectional screw to rotate; the two clamping plates are respectively sleeved and threadedly connected to the two opposite threaded segments of the bidirectional screw, and the two clamping plates are simultaneously sleeved and slid on the guide rod.

[0012] By adopting the above technical solution, when the driving member drives the bidirectional screw to rotate, the two clamping plates on the bidirectional screw can move towards or away from each other.

[0013] Optionally, the rotating assembly includes a sprocket, a chain, a first gear, a second gear and a rotating source; the sprockets correspond to the first water delivery sections one by one and are coaxially sleeved on the corresponding first water delivery sections; the chain simultaneously engages the sprockets on the two first water delivery sections; the first gear is coaxially sleeved on one of the first water delivery sections; the rotating source is installed on the base frame and coaxially fixed with the second gear, and the second gear is engaged with the first gear.

[0014] By adopting the above technical solution, the second gear is driven to rotate by the rotation source, thereby driving the first gear and its corresponding first water delivery section to rotate, and then driving another water delivery section to rotate together through the cooperation of the sprocket and the chain.

[0015] Optionally, the cooling tube has rubber layers on both sides of the opposite sides against which the clamping plate abuts, and the clamping plate squeezes the rubber layers when clamping the cooling tube.

[0016] By adopting the above technical solution, by arranging rubber layers on opposite sides of the cooling pipe, the friction between the clamping plate and the cooling pipe is increased, making the clamping more firm and improving the sealing effect. At the same time, the rubber layer can also play a buffering role to protect the cooling pipe.

[0017] Optionally, the exhaust gas treatment system further comprises a spraying member for spraying water, wherein the spraying member has two groups and both are located between the two clamping plates, and when the clamping plates clamp the cooling pipes, the two groups of the spraying members respectively correspond to the sides of the two cooling pipes facing away from each other.

[0018] By adopting the above technical solution, the cooling pipe can be cleaned by spraying water through the spraying member, which can effectively remove the particles attached to the cooling pipe and maintain the cleanliness and heat exchange efficiency of the cooling pipe.

[0019] Optionally, the exhaust gas treatment system further comprises a guide box located below the base frame, the guide box is opposite to the cold water pipe, and the guide box is connected to a water storage tank, and the water inlet end of the spraying member draws water from the water storage tank through a pipe.

[0020] By adopting the above technical solution and adding a guide box and a water storage tank, the collection and reuse of cleaning water is achieved.

[0021] Optionally, the water tank has a filter element that separates the inner cavity of the water tank into a sewage cavity and a clean water cavity, the guide box is connected to the sewage cavity, and the spray element is connected to the clean water cavity.

[0022] By adopting the above technical solution, the sewage chamber and the clean water chamber are separated, so that the water drawn by the spraying member can be kept in a clean state.

[0023] Optionally, the water flow directions of the two cooling pipes are opposite.

[0024] By adopting the above technical solution and making the water flow directions of the two cooling pipes opposite, more uniform cooling of the exhaust gas is achieved.

[0025] In summary, the present application includes at least one of the following beneficial effects: 1. By designing switchable cooling channels and self-rotating cooling pipes, the problem of reduced heat exchange effect caused by long-term attachment of particulate matter in the exhaust gas on the same side of the cooling pipe is reduced, so that the exhaust gas can pass through different cooling channels, and the cooling pipe can rotate to switch states, thereby improving the cooling efficiency and exhaust gas treatment effect; 2. The collection and reuse of cleaning water is achieved through the combination of components such as spraying parts, guide boxes and water storage tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application; Figure 2 is a schematic diagram of the structure of the cooling device in an embodiment of the present application; Figure 3 This is a schematic diagram of the structure of the cooling device after the clamping plate is hidden in the embodiment of the present application; Figure 4 yes Figure 2 A schematic diagram of the enlarged structure at A in the middle; Figure 5 is a schematic structural diagram of a cooling pipe in an embodiment of the present application when it is in a first state; Figure 6 is a schematic structural diagram of the cooling pipe in the second state of the embodiment of the present application; Figure 7 It is a structural schematic diagram of the water storage tank in the embodiment of the present application.

[0027] Explanation of the reference numerals: 1. cooling device; 2. reaction device; 3. dust removal device; 4. base frame; 5. clamping plate; 6. cooling pipe; 61. first water delivery section; 62. bending section; 63. second water delivery section; 7. driving assembly; 71. bidirectional screw; 72. guide rod; 73. driving source; 8. rotating assembly; 81. sprocket; 82. chain; 83. first gear; 84. second gear; 85. rotating source; 9. first cooling channel; 10. second cooling channel; 11. air inlet pipe; 12. air outlet pipe; 13. valve; 14. rubber layer; 15. spraying member; 16. guide box; 17. water storage tank; 18. sewage chamber; 19. clean water chamber; 20. filter element; 21. first bending portion; 22. second bending portion; 23. cross bar; 24. accommodating chamber; 25. drain outlet; 26. drain pipe; 27. water delivery pipe. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-7 This application is described in further detail.

[0029] The present application embodiment discloses a waste incineration power plant tail gas treatment system. Figure 1 The waste incineration power plant tail gas treatment system includes a cooling device 1, a reaction device 2 and a dust removal device 3 which are connected in sequence. The cooling device 1 is used to cool the exhaust gas discharged. After the exhaust gas is cooled, it enters the reaction device 2 for reaction. After the exhaust gas is reacted, it enters the dust removal device 3 for dust removal and is discharged from the chimney 28. Among them, the reaction device 2 is an existing semi-dry reaction tower, and slaked lime slurry is sprayed in the reaction tower; the dust removal device 3 is an existing bag-type dust collector.

[0030] Reference Figure 2 and Figure 3 The cooling device 1 comprises a base frame 4, a clamping plate 5 and a cooling tube 6, wherein the clamping plate 5 and the cooling tube 6 each have two. The base frame 4 is in the shape of a hollow square frame, and the two clamping plates 5 are both in the shape of square plates. The base frame 4 has a driving component 7 for driving the two clamping plates 5 to move toward or away from each other.

[0031] Specifically, the driving assembly 7 includes a bidirectional screw 71, a guide rod 72 and a driving source 73. The bidirectional screw 71 is rotatably connected to the base frame 4 and extends along the distribution direction of the two clamping plates 5. The guide rod 72 is fixedly connected to the base frame 4, and the guide rod 72 is parallel to the bidirectional screw 71, and there are two guide rods 72 and two bidirectional screws 71 vertically, respectively distributed at the four side lines of the base frame 4. The driving source 73 is a rotating motor, which is installed on the base frame 4 and corresponds to the bidirectional screw 71 one by one to drive the driving source 73 to rotate.

[0032] Each clamping plate 5 is sleeved with two bidirectional screws 71 and two guide rods 72, and the two clamping plates 5 are respectively threadedly connected to the two opposite thread segments of the bidirectional screw 71. Therefore, when the driving source 73 drives the bidirectional screw 71 to rotate, the two clamping plates 5 are driven to move toward or away from each other.

[0033] Reference Figure 2 and Figure 3 , the two cooling pipes 6 are both located between the two clamping plates 5, and the two cooling pipes 6 are both rotatably connected to the base frame 4. Specifically, each cooling pipe 6 includes a first water delivery section 61, a curved section 62, and a second water delivery section 63 which are sequentially connected from top to bottom. The first water delivery section 61 and the second water delivery section 63 are both extended vertically and coaxially, and the first water delivery section 61 and the second water delivery section 63 have mounting seats for moving the connecting member, and the mounting seats have pairs. The curved section 62 is arranged in a winding direction from the first water delivery section 61 to the second water delivery section 63, so that the curved section 62 is formed with a first curved portion 21 and a second curved portion 22 with opposite bending directions, and the first curved portion 21 and the second curved portion 22 are alternately arranged vertically and sequentially connected, and the bending point of the first curved portion 21 is offset to one side of the length extension line of the first water delivery section 61, and the bending point of the second curved portion 22 is located on the length extension line of the first water delivery section 61.

[0034] Reference Figure 3 , wherein the upper and lower sides of the base frame 4 are provided with cross bars 23, the length extension direction of the cross bars 23 is perpendicular to the moving direction of the clamping plate 5, the two cross bars 23 are parallel to each other and located on the same vertical plane, the cross bars 23 are located at the center of the two clamping plates 5, and the vertical planes opposite to the cross bars 23 are parallel to the plate surface of the clamping plate 5. The first water delivery sections 61 of the two cooling pipes 6 are both rotatably connected and penetrated on the cross bars 23 at the top of the base frame 4, and the second water delivery sections 63 of the two cooling pipes 6 are both rotatably connected and penetrated on the cross bars 23 at the bottom of the base frame 4, and a receiving cavity 24 for the extension of the curved section 62 is formed between the two cross bars 23.

[0035] The rotation axes of the first water delivery section 61 and the second water delivery section 63 on the same cooling pipe 6 are coaxial, the rotation axes of the first water delivery sections 61 on the two cooling pipes 6 are parallel to each other, and the winding paths of the curved sections 62 of the two cooling pipes 6 are also parallel to each other.

[0036] It should be noted that the first water delivery section 61 and the second water delivery section 63 are both connected to a water delivery pipe 27 connected to a water source (not shown in the figure) through a rotary sealing joint to realize the flow of cooling water in the cooling pipe 6. Only a part of the water delivery pipe 27 is shown in the figure. More preferably, the water flow of one cooling pipe 6 flows from the first water delivery section 61 to the second water delivery section 63, and the water flow of the other cooling pipe 6 flows from the second water delivery section 63 to the first water delivery section 61.

[0037] Reference Figure 3 and Figure 4 The base frame 4 has a rotating assembly 8 for driving the two cooling pipes 6 to rotate synchronously. The rotating assembly 8 drives the cooling pipes 6 to rotate so that the cooling pipes 6 switch between the first state and the second state corresponding to themselves. In the first state, the cooling pipe 6 rotates 180° around the axis of the first water delivery section 61 to reach the second state of the cooling pipe 6, so that the shapes of the cooling pipe 6 in the first state and the second state are mirror-symmetrical along the axis of the first water delivery section 61.

[0038] Specifically, the rotating assembly 8 includes a sprocket 81, a chain 82, a first gear 83, a second gear 84 and a rotating source 85. Specifically, there are two sprockets 81 corresponding to the cooling tubes 6, and the sprockets 81 are coaxially sleeved and fixed on the first water delivery section 61 of the corresponding cooling tube 6, and the sprockets 81 are located outside the accommodating chamber 24. The chain 82 is sleeved and meshed on the two sprockets 81 at the same time, so that when one of the first water delivery sections 61 rotates, the other first water delivery section 61 can be driven to rotate through the chain 82. The first gear 83 is coaxially fixed and sleeved on the outer wall of one of the first water delivery sections 61. The rotating source 85 is a rotating motor and is mounted on the top cross bar 23 of the base frame 4. The output end of the rotating power source extends vertically and is coaxially fixed with the second gear 84. The second gear 84 is meshed with the first gear 83 at the same time, so that one of the first water delivery sections 61 can be driven to rotate through the rotating source 85.

[0039] Reference Figure 5 and Figure 6 , wherein, when the cooling tube 6 is in the first state and the second state, the extension direction of the cooling tube 6 is parallel to the plate surface of the clamping plate 5, so that the two clamping plates 5 can move toward each other, and the two clamping plates 5 clamp the two cooling tubes 6 together, and the upper and lower sides of the clamping plates 5 respectively abut against the opposite sides of the upper and lower cross bars 23 of the base frame 4. When the cooling tube 6 is in the first state, the two cooling tubes 6, the two clamping plates 5 and the two cross bars 23 together enclose a first cooling channel 9 that meanders vertically; similarly, when the cooling tube 6 is in the second state, the two cooling tubes 6, the two clamping plates 5 and the two cross bars 23 together enclose a second cooling channel 10 that meanders vertically. The side of the cooling tube 6 that faces the first cooling channel 9 when it is in the first state is away from the second cooling channel 10 when the cooling tube 6 is in the second state.

[0040] It should be noted that the rotation of the cooling tube 6 needs to be carried out when the two clamping plates 5 are away from each other, so that there is enough space between the two clamping plates 5 for the cooling tube 6 to rotate. After the rotation of the cooling tube 6 is completed, the two clamping plates 5 are moved towards each other to clamp the cooling tube 6.

[0041] Reference Figure 5 and Figure 6, the first cooling channel 9 and the second cooling channel 10 are both used for the exhaust gas to pass through, so that the exhaust gas contacts the wall of the cooling pipe 6 for heat exchange. Therefore, the exhaust gas treatment system also includes an inlet pipe 11 and an outlet pipe 12. The inlet pipe 11 passes downward through the upper cross bar 23 of the base frame 4 and is located between the two first water delivery sections 61, and the inlet pipe 11 is used to guide the exhaust gas to between the two cooling pipes 6, and the inlet pipe 11 has a valve 13 for cutting off the path of the connecting pipe of the inlet pipe 11. One end of the outlet pipe 12 passes upward through the lower cross bar 23 of the base frame 4 and is located between the two second water delivery sections 63, and the other end of the outlet pipe 12 is connected to the inlet end of the reaction device 2, so as to send the cooled exhaust gas into the reaction device 2.

[0042] When the exhaust gas treatment system is in the initial state, the cooling pipe 6 is first turned to the first state and the first cooling channel 9 is formed. The exhaust gas meanders in the first cooling channel 9 for transmission and cooling. When particles in the exhaust gas adhere to the outer wall of the cooling pipe 6 to hinder the heat exchange of the exhaust gas, the valve 13 is opened, and then the cooling pipe 6 is turned to the second state to form the second cooling channel 10, and then the valve 13 is opened to continue the transmission of the exhaust gas. Since the outer wall of the cooling pipe 6 that contacts the exhaust gas when the exhaust gas is transmitted in the second cooling channel 10 is not attached by particles, the exhaust gas cooling effect can be improved.

[0043] Reference Figure 2 and Figure 3 Furthermore, in order to improve the sealing between the clamping plate 5 and the cooling pipe 6, the cooling pipe 6 has a rubber layer 14 on both sides of the two cross bars 23 for the clamping plate 5 to abut against each other, and the rubber layer 14 extends along the cooling pipe 6. When the clamping plate 5 clamps the cooling pipe 6, the rubber layer 14 is squeezed to cause elastic deformation of the rubber layer 14, so as to reduce the risk of air leakage in the first cooling channel 9 and the second cooling channel 10.

[0044] Furthermore, the exhaust gas treatment system also includes a spraying member 15, which is used to flush and clean the outer wall of the cooling pipe 6 away from the cooling channel. Specifically, there are two groups of spraying members 15, and the two groups of spraying members 15 are distributed at the two ends of the cross bar 23 that are away from each other and opposite to the curved section 62. When the clamping plate 5 clamps the cooling pipe 6, the spraying member 15 is opposite to the space between the two clamping plates 5, and the two groups of spraying members 15 correspond to the sides of the two cooling pipes 6 that are away from each other. Each group of spraying members 15 includes a main pipe and a nozzle, the main pipe extends vertically, and a plurality of nozzles are evenly spaced vertically along the main pipe, and the main pipe is connected to a water source (not shown in the figure) through a pipeline to supply water to the spraying member 15.

[0045] After the cooling pipe 6 is switched from the first state to the second state, or after the cooling pipe 6 is switched from the second state to the first state, the spraying member 15 automatically sprays water for a period of time to flush the outer wall of the cooling pipe 6 to which particles are attached, so that the cooling pipe 6 can switch back and forth between the first state and the second state, while improving the cooling effect of the cooling pipe 6.

[0046] Reference Figure 3 In order to improve the utilization rate of waste water for flushing the cooling pipe 6, a guide box 16 for supporting the basic frame 4 is provided under the basic frame 4. The guide box 16 has an upward opening. A water outlet 25 connected to the guide box 16 is provided on the cross bar 23 at the bottom end of the basic frame 4, and the pipes extending downward from the cross bar 23 at the bottom end of the basic frame 4 are all passed downward through the bottom plate of the guide box 16 and then extended.

[0047] Reference Figure 3 and Figure 7 The bottom of the flow guide box 16 is connected to a drain pipe 26, and the flow guide box 16 is connected to the water storage tank 17 through the drain pipe 26. A filter 20 is detachably installed in the water storage tank 17 by bolts. The filter 20 is plate-shaped and has water filtering holes arranged in an array. The filter 20 divides the inner cavity of the water storage chamber into a sewage chamber 18 and a clean water chamber 19 distributed up and down. The drain pipe 26 discharges the sewage into the sewage chamber 18. The sewage flows into the clean water chamber 19 after being filtered by the filter 20, and the spraying member 15 flushes the cooling pipe 6 by pumping water from the clean water chamber 19.

[0048] Reference Figure 3 and Figure 5 Furthermore, a temperature sensor (not shown in the figure) is installed in the outlet pipe 12, and the temperature sensor controls the valve 13, the driving source 73 and the rotating source 85 through the controller. When the temperature sensor detects that the temperature of the cooled exhaust gas is higher than a set value, the temperature sensor transmits a signal to the controller, and the controller controls the valve 13 to close, and the driving source 73 and the power source switch the cooling pipe 6 from the first state to the second state, or switch the cooling pipe 6 from the second state to the first state, and then open the valve 13 to continue to transmit the exhaust gas.

[0049] The implementation principle of the waste incineration power plant exhaust gas treatment system of the embodiment of the present application is as follows: when the exhaust gas passes through the cooling device 1, it is transmitted and cooled in the first cooling channel 9 or the second cooling channel 10. When dust particles in the exhaust gas adhere to the wall of the cooling pipe 6 and affect the heat exchange of the exhaust gas, the valve 13 on the intake pipe 11 is closed, and then the cooling pipe 6 is rotated from the current state to another state so that the wall of the cooling pipe 6 with particles attached is exposed, and then the valve 13 is opened to continue to transmit the exhaust gas, and at the same time, the spray part flushes the outer wall of the cooling pipe 6.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A waste incineration power plant tail gas treatment system, characterized in that: include: A cooling device (1), a reaction device (2) and a dust removal device (3) are sequentially connected to the exhaust gas; the cooling device (1) comprises a base frame (4), a clamping plate (5) and a cooling pipe (6); The number of the clamping plates (5) is two, the two clamping plates (5) are parallel to each other, and the base frame (4) has a driving component (7) for driving the two clamping plates (5) to move in the same straight line direction toward or away from each other; There are two cooling pipes (6), each of which comprises a first water delivery section (61), a curved section (62) and a second water delivery section (63) which are connected in sequence, and the curved section (62) is arranged in a winding direction from the first water delivery section (61) to the second water delivery section (63); the first water delivery section (61) and the second water delivery section (63) of the same cooling pipe (6) are coaxially rotatably connected to the base frame (4), and the two cooling pipes (6) are parallel to each other and located between the two clamping plates (5); The base frame (4) has a rotating assembly (8) for driving the cooling pipe (6) to rotate along the axis of the first water delivery section (61), so that the cooling pipe (6) switches between a first state and a second state corresponding to itself; the first state and the second state of the cooling pipe (6) are mirror images along the axis of the first water delivery section (61); The first state is characterized by the two clamping plates (5) being able to clamp the two cooling tubes (6) at the same time, so that the cooling tubes (6) and the clamping plates (5) together form a first cooling channel (9); the second state is characterized by the two clamping plates (5) being able to clamp the two cooling tubes (6) at the same time, so that the cooling tubes (6) and the clamping plates (5) together form a second cooling channel (10); the first cooling channel (9) and the second cooling channel (10) are both used for cooling exhaust gas; and a side of the cooling tube (6) facing away from the first cooling channel (9) is opposite to the second cooling channel (10).

2. The waste incineration power plant tail gas treatment system according to claim 1, characterized in that: The exhaust gas treatment system further comprises an intake pipe (11) and an outlet pipe (12), wherein the intake pipe (11) is used to input exhaust gas and extends between the two first water delivery sections (61), and the outlet pipe (12) is used to discharge exhaust gas and extends between the two second water delivery sections (63).

3. A waste incineration power plant tail gas treatment system according to claim 2, characterized in that: The air outlet pipe (12) is provided with a temperature sensor, and the air inlet pipe (11) is provided with a valve (13); the temperature sensor controls the valve (13), the drive component (7) and the rotating component (8); when the temperature sensed by the temperature sensor is higher than a set value, the valve (13) closes the air inlet pipe (11), and at the same time, the drive component (7) and the rotating component (8) are linked to switch the state of the cooling pipe (6).

4. The waste incineration power plant tail gas treatment system according to claim 1, characterized in that: The driving assembly (7) comprises a bidirectional screw (71), a guide rod (72) and a driving source (73); the bidirectional screw (71) is rotatably connected to the base frame (4); the guide rod (72) is connected to the base frame (4) and is parallel to the bidirectional screw (71); the driving source (73) is mounted on the base frame (4) and is used to drive the bidirectional screw (71) to rotate; the two clamping plates (5) are respectively sleeved and threadedly connected to two threaded sections of the bidirectional screw (71) with opposite threads, and the two clamping plates (5) are simultaneously sleeved and slidably mounted on the guide rod (72).

5. The waste incineration power plant tail gas treatment system according to claim 1, characterized in that: The rotating assembly (8) comprises a sprocket (81), a chain (82), a first gear (83), a second gear (84) and a rotating source (85); the sprockets (81) correspond to the first water delivery sections (61) one by one and are coaxially sleeved on the corresponding first water delivery sections (61); the chain (82) simultaneously meshes with the sprockets (81) on two first water delivery sections (61); the first gear (83) is coaxially sleeved on one of the first water delivery sections (61); the rotating source (85) is mounted on the base frame (4) and is coaxially fixed with the second gear (84), and the second gear (84) is meshed with the first gear (83).

6. The waste incineration power plant tail gas treatment system according to claim 1, characterized in that: The cooling tube (6) has rubber layers (14) on both sides opposite to each other where the clamping plate (5) abuts against it, and the rubber layers (14) are squeezed when the clamping plate (5) clamps the cooling tube (6).

7. The waste incineration power plant tail gas treatment system according to claim 1, characterized in that: The exhaust gas treatment system further comprises a spraying member (15) for spraying water, wherein the spraying member (15) comprises two groups and both groups are located between the two clamping plates (5); when the clamping plates (5) clamp the cooling pipe (6), the two groups of the spraying members (15) respectively correspond to the sides of the two cooling pipes (6) that are away from each other.

8. The waste incineration power plant tail gas treatment system according to claim 7, characterized in that: The exhaust gas treatment system further comprises a flow guide box (16) located below the base frame (4), the flow guide box (16) being opposite to the cold water pipe, and the flow guide box (16) being connected to a water storage tank (17), and the water inlet end of the spraying member (15) taking water from the water storage tank (17) through a pipeline.

9. A waste incineration power plant tail gas treatment system according to claim 8, characterized in that: The water storage tank (17) comprises a filter element (20) which divides the inner cavity of the water storage tank (17) into a sewage cavity (18) and a clean water cavity (19); the flow guide box (16) is in communication with the sewage cavity (18); and the spray element (15) is in communication with the clean water cavity (19).

10. The waste incineration power plant tail gas treatment system according to claim 1, characterized in that: The water flows in the two cooling pipes (6) are in opposite directions.

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