A coal-fired engine exhaust gas cooling and filtering integrated device

Abstract

The invention discloses an integrated cooling and filtering device for exhaust gas from a coal-fired engine, and relates to the technical field of flue gas treatment. The main points of the technical solution are as follows: the shell comprises a cooling and dust removal section, an ammonia mixing section and an ammonia reaction section; the cooling and dust removal section is provided with an air inlet for introducing exhaust gas to be treated; a cooling and intercepting mechanism is provided in the air inlet to cool the introduced exhaust gas and intercept dust in the exhaust gas; the effect is that a cooling and intercepting component is provided at the air inlet, the exhaust gas introduced into the air inlet is cooled by a cooling pipeline, so that the exhaust gas reaches a temperature more suitable for a denitration reaction, and the dust in the exhaust gas is intercepted by an intercepting arc plate; a catalyst ash passing mechanism is provided in the ammonia reaction section, and the catalyst on the lower transfer component is transported to the upper transfer component by a lifting component in cooperation with a transfer component; the dust on the surface of the catalyst falls from the gap between the transfer rods when the catalyst is transported by the transfer rods on the transfer component.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment, and more specifically, to an integrated cooling and filtering device for tail gas from a coal-fired engine. Background Art

[0002] When coal is burned, harmful gases and particulate matter are produced, including nitrogen oxides (NOx), carbon dioxide (CO 2 ), sulfur dioxide (SO 2 ) and carbon monoxide (CO). Nitrogen oxides, sulfur dioxide and carbon monoxide are all harmful gases and need to be filtered.

[0003] Usually, the tail gas is first subjected to denitration, then dust removal, and finally desulfurization. Denitration uses the method of introducing ammonia to react with nitrogen oxides to produce water and ammonia; dust removal uses high voltage electricity to make the surface of particles carry negative ions so that they are adsorbed on the positive plate, and then the positive plate is knocked regularly by a mechanical structure to make the dust fall off; desulfurization treatment is to spray lime water on the tail gas to produce stable calcium sulfate, which will be carried away by the water flow and separated from the tail gas.

[0004] In actual production, the optimal reaction temperature for denitrification is usually between 300℃ and 400℃, while the temperature of the exhaust gas just discharged is relatively high, and the reaction between nitrogen oxides and ammonia is an exothermic reaction, which increases the temperature of the denitrification reaction environment, which is not conducive to the forward reaction and affects the reaction rate. In addition, the large amount of dust contained in the exhaust gas will adhere to the catalyst surface, thereby affecting the catalytic efficiency, reducing the combination efficiency of nitrogen oxides and ammonia, and affecting the reaction rate.

[0005] Therefore, in order to solve the above technical problems, the present invention proposes an integrated cooling and filtering device for coal-fired engine exhaust gas. Summary of the invention

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide an integrated cooling and filtering device for coal-fired engine exhaust gas.

[0007] To achieve the above object, the present invention provides the following technical solution: the coal-fired engine exhaust gas cooling and filtering integrated device comprises a shell as a container for cooling and filtering the exhaust gas generated by coal combustion, the shell comprising a cooling and dust removal section, an ammonia mixing section and an ammonia reaction section,

[0008] The cooling and dust removal section is provided with an air inlet for introducing the exhaust gas to be treated, and a cooling and intercepting mechanism is provided in the air inlet to cool the introduced exhaust gas and intercept the dust in the exhaust gas;

[0009] In addition, the ammonia mixing section is used to introduce ammonia into the tail gas and guide the ammonia and tail gas to mix evenly;

[0010] In addition, the ammonia reaction section is provided with a catalyst ash-passing mechanism and a spray assembly. The catalyst ash-passing mechanism is used to circulate and transport the solid catalyst that increases the denitrification rate to remove the dust attached to its surface to ensure the catalytic effect. The spray assembly is used to spray water to take away the dust filtered by the catalyst ash-passing mechanism.

[0011] In this solution, the cooling interception mechanism includes an interception arc plate, and the interception arc plate is provided with multiple groups installed on the inner wall of the shell through the mounting rod. A cooling pipeline is inserted in the interception arc plate, and the cooling pipeline is connected to the compressor. The compressor is used to compress and circulate air to cool the hot air transmitted from the cooling pipeline and then transmit it back, so that the interception arc plate continues to cool the exhaust gas;

[0012] A plurality of cams are rotatably connected above the intercepting arc plate, and the cams are arranged on the output shaft of the toggle motor so that the collected dust can be shaken off by rotating the cams to toggle the intercepting arc plate. A dust collecting hopper is arranged below the mounting rod for collecting the dust shaken off the intercepting arc plate.

[0013] In this embodiment, the ammonia mixing section is provided with an ammonia release component for releasing ammonia required for the denitrification reaction. An air evacuation plate is provided above the ammonia release component for evacuating the ammonia sprayed from the ammonia release component. An air guide plate is provided at the junction of the ammonia mixing section and the ammonia reaction section for evenly introducing the exhaust gas mixed with ammonia into the ammonia reaction section.

[0014] It should be noted that the catalyst ash passing mechanism includes a transfer component, a lifting component and a unloading rod. The transfer component is provided with at least two groups, an upper and a lower group. The upper transfer component transports the catalyst to the lower transfer component. The lifting component is used to receive the catalyst transmitted by the lower transfer component and transport the catalyst back to the upper transfer component to realize the circulation transportation of the catalyst and remove the dust attached to the catalyst surface.

[0015] Furthermore, the transmission component includes a transmission chain, on which a plurality of transmission rods are arranged, with gaps between the transmission rods to ensure that dust in the exhaust gas can fall through the gaps during the transportation of the catalyst, the transmission chain is transmission-connected to a transmission sprocket, the transmission sprocket is connected to a drive shaft of a transmission motor, and the transmission chain is slidably connected to a track opened on a track frame.

[0016] Among them, the lifting assembly includes a lifting sprocket, on which multiple sets of guard plates are fixed, and a hopper is rotatably connected inside the guard plate. The hopper is used to receive, transport and release the catalyst, the lifting chain is transmission connected to the lifting sprocket, and the lifting sprocket is transmission connected to the lifting motor.

[0017] Preferably, the discharge rod is disposed on a track frame of the upper transfer assembly, and is used to move the hopper to tilt the hopper and pour the catalyst onto the upper transfer assembly.

[0018] Preferably, the spray assembly is mounted on the inner wall of the shell through a mounting frame, and the spray assembly is located below the catalyst ash passing mechanism.

[0019] Preferably, an exhaust port is provided next to the spray component for discharging the tail gas after cooling and filtration to the next treatment process, and a sewage outlet is provided below the spray component for discharging sewage after spraying the mixed dust.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the present invention, a cooling interception assembly is arranged at the air inlet, and the interception arc plate is cooled by a cooling pipeline, so that the tail gas introduced into the air inlet is cooled, so that the tail gas reaches a temperature more suitable for the denitration reaction, and then the dust in the tail gas is intercepted by the interception arc plate, and the interception arc plate is rotated and moved by a cam, so that the interception arc plate is shaken to shake off the collected dust, thereby reducing the dust content in the tail gas, so as to solve the problem that the optimal reaction temperature of denitration is usually between 300-400°C, while the temperature of the tail gas just discharged is relatively high, and the reaction of nitrogen oxides and ammonia is an exothermic reaction, which increases the temperature of the denitration reaction environment, is not conducive to the forward reaction, and affects the reaction rate;

[0022] 2. In the present invention, a catalyst ash-passing mechanism is provided in the ammonia reaction section, and the catalyst on the lower transfer assembly is transported back to the upper transfer assembly through the lifting assembly and the transfer assembly. When the catalyst is transported by the transfer rods on the transfer assembly, the dust on its surface will fall from the gaps between the transfer rods, thereby leaking out of the surface to achieve a catalytic effect and accelerate the denitration reaction of exhaust gas and ammonia, so as to solve the problem that a large amount of dust contained in the exhaust gas will adhere to the catalyst surface, thereby affecting the catalytic efficiency, reducing the combination efficiency of nitrogen oxides and ammonia, and affecting the reaction rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 It is a schematic structural diagram of the overall front side of the device in the present invention;

[0025] Figure 2 It is a schematic structural diagram of the back side of the whole device in the present invention;

[0026] Figure 3It is a schematic diagram of the internal structure of the housing in the present invention;

[0027] Figure 4 A cross-sectional view of the entire device of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the catalyst ash passing mechanism in the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the temperature reduction and interception mechanism in the present invention.

[0030] 1. Shell;

[0031] 11. Cooling and dust removal section; 111. Air inlet;

[0032] 12. Ammonia mixing section; 121. Ammonia release assembly; 122. Air venting plate; 123. Air guide plate;

[0033] 13. Ammonia reaction section;

[0034] 132. mounting frame; 133. spray assembly; 134. exhaust port; 135. sewage outlet;

[0035] 2. Cooling interception mechanism;

[0036] 21. Intercepting arc plate; 22. Cooling pipeline; 23. Compressor; 24. Steering motor; 25. Cam; 26. Ash receiving hopper; 27. Mounting rod;

[0037] 3. Catalyst ash passing mechanism;

[0038] 31. Transfer components;

[0039] 311, transmission motor; 312, transmission sprocket; 313, transmission chain; 314, track frame; 315, transmission rod;

[0040] 32. Material lifting assembly;

[0041] 321. Lifting motor; 322. Lifting sprocket; 323. Lifting chain; 324. Guard plate; 325. Hopper; 33. Discharge rod. DETAILED DESCRIPTION

[0042] like Figure 1-6As shown, the present invention provides an integrated device for cooling and filtering exhaust gas from a coal-fired engine, comprising a shell 1 as a container for cooling and filtering exhaust gas generated by coal combustion, the shell 1 comprising a cooling and dust removal section 11, an ammonia mixing section 12 and an ammonia reaction section 13, wherein the cooling and dust removal section 11 is provided with an air inlet 111 for introducing the exhaust gas to be treated, and a cooling and intercepting mechanism 2 is provided in the air inlet 111 to cool the introduced exhaust gas and intercept dust in the exhaust gas, and preliminarily cool the exhaust gas so that the exhaust gas temperature reaches a temperature closer to the optimal reaction temperature of denitrification of 300°C-400°C;

[0043] In addition, the ammonia mixing section 12 is used to introduce ammonia into the tail gas and guide the ammonia and tail gas to be evenly mixed, so that the ammonia molecules and the nitrogen compounds in the tail gas are fully contacted to increase the denitration reaction rate;

[0044] In addition, the ammonia reaction section 13 is provided with a catalyst dust-passing mechanism 3 and a spray assembly 133. When the tail gas flows through the catalyst in the shell 1, the solid catalyst that increases the denitration rate will also play a role in filtering dust. However, if the catalyst remains stationary, the dust will accumulate and eventually affect the catalytic effect. Therefore, the catalyst dust-passing mechanism 3 is provided to circulate and transport the catalyst to remove the dust attached to its surface to ensure the catalytic effect. The spray assembly 133 is used to spray water to take away the dust filtered by the catalyst dust-passing mechanism 3, so as to prevent the dust from floating back to the catalyst surface again.

[0045] In this solution, the cooling interception mechanism 2 includes an interception arc plate 21, as shown in the attached Figure 4 and 6 As shown, the interception arc plate 21 is an arc-shaped structure, and two flat plates fixed together with an opening forward to form a certain angle can also be set, so that when the exhaust gas passes through the interception arc plate 21, the dust is intercepted by the inner hook of the upper part and distributed along the interception surface of the interception arc plate 21. Under the action of gravity, if the dust accumulates too much, it can naturally slide down along the curvature of the lower part of the interception arc plate 21. The interception arc plate 21 is provided with multiple groups installed on the inner wall of the shell 1 through the mounting rod 27. The interception arc plate 21 is interspersed with a cooling pipeline 22, and the cooling pipeline 22 is connected to the compressor 23. The compressor 23 is used to compress and circulate air to cool the hot air transmitted from the cooling pipeline 22 and then transmit it back. The cooling pipeline 22 cools the interception arc plate 21. After the interception arc plate 21 intercepts the exhaust gas, the dust is left behind, and the heat in the gas is reduced, so that the interception arc plate 21 continues to cool the exhaust gas;

[0046] A plurality of cams 25 are rotatably connected above the intercepting arc plate 21. The cams 25 are arranged on the output shaft of the toggle motor 24. The toggle motor 24 drives the cams 25 to rotate. When the raised portion of the cams 25 contacts the top of the intercepting arc plate 21, the intercepting arc plate 21 is pushed to deform. When the cams 25 rotate to a circumferential surface with a smaller outer diameter, the intercepting arc plate 21 returns to its initial state. During the process, the bottom of the intercepting arc plate 21 is fixed by the mounting rod 27, and the upper portion of the intercepting plate will vibrate and transmit the movement downward. Finally, the cams 25 rotate and toggle the intercepting arc plate 21 to shake off the collected dust. An ash hopper 26 is arranged below the mounting rod 27 to collect the dust shaken off the intercepting arc plate 21. The side of the ash hopper is arranged to be an open structure, which can be opened to clean the dust inside.

[0047] Therefore, by setting a cooling interception component at the air inlet 111, the interception arc plate 21 is cooled by the cooling pipeline 22, so that the exhaust introduced into the air inlet 111 is cooled, so that the exhaust reaches a temperature more suitable for the denitration reaction, and then the dust in the exhaust is intercepted by the interception arc plate 21, and the interception arc plate 21 is rotated and moved by the cam 25, so that the interception arc plate 21 is shaken to shake off the collected dust, thereby reducing the dust content in the exhaust, so as to solve the problem that the optimal reaction temperature of denitration is usually between 300-400°C, while the temperature of the exhaust gas just discharged is relatively high, and the reaction of nitrogen oxides and ammonia is an exothermic reaction, which increases the temperature of the denitration reaction environment, is not conducive to the forward reaction, and affects the reaction rate;

[0048] In this embodiment, the ammonia mixing section 12 is provided with an ammonia releasing component 121, such as Figure 3 As shown, an ammonia release pipeline is installed in the shell 1, and air outlet holes are evenly distributed on the ammonia release pipeline. The ammonia pipe is arranged outside the shell 1. The ammonia tank is opened by controlling the valve, and the air outlet on the ammonia release pipeline will start to release the ammonia required for the denitration reaction. An air venting plate 122 is arranged above the ammonia release component 121, and a plurality of holes are evenly distributed on the air venting plate 122. The ammonia flow released from the air holes on the ammonia release pipeline is scattered after contacting the air venting plate 122, and then continues to be transmitted forward along the holes on the air venting plate 122, thereby achieving the effect of evacuating the ammonia sprayed from the ammonia release component 121. An air guide plate 123 is arranged at the junction of the ammonia mixing section 12 and the ammonia reaction section 13. In order to ensure that ammonia and tail gas fully react, the cross section of the ammonia mixing section 12 is smaller than the cross section of the ammonia reaction section 13, so the air guide plate 123 is arranged as a fishtail divergent structure to evenly introduce the tail gas mixed with ammonia into the ammonia reaction section 13;

[0049] It should be noted that the catalyst ash passing mechanism 3 includes a transmission component 31, a lifting component 32 and a discharge rod 33. The transmission component 31 is provided with at least two groups, the upper transmission component 31 transports the catalyst to the lower transmission component 31, as shown in the attached figure. Figure 4 and5 As shown, the upper transfer component 31 is set to be lower on the left and higher on the right, and the lower transfer component 31 is set to be higher on the left and lower on the right, and the upper transfer component 31 is set to be farther back than the left starting position of the lower transfer component 31, so the catalyst can be transported from the upper right to the lower right by the upper transfer component 31, so that the catalyst slides onto the lower transfer component 31, and the lower transfer component 31 then transports the catalyst from the upper left to the lower right, at this time the lifting component 32 will receive the catalyst transmitted by the lower transfer component 31, and transport the catalyst back to the upper transfer component 31, finally realizing the circular transportation of the catalyst and removing the dust attached to the catalyst surface;

[0050] Further, the transmission component 31 includes a transmission chain 313, on which a plurality of transmission rods 315 are arranged, and gaps are left between the transmission rods 315 to ensure that dust in the exhaust gas can fall from the gaps during the catalyst transportation process. The transmission chain 313 is transmission-connected to the transmission sprocket 312, and the transmission sprocket 312 is connected to the driving shaft of the transmission motor 311. The transmission chain 313 is slidably connected to the track provided on the track frame 314, and the motor transmission brakes the transmission sprocket. The transmission sprocket 312 rotates to pull the transmission chain 313 to move, and the track frame 314 remains stationary and constrains the rotation trajectory of the transmission component 31 to prevent the transmission chain 313 from falling off.

[0051] The material lifting assembly 32 includes a material lifting sprocket 322, on which a plurality of guard plates 324 are fixed, and a hopper 325 is rotatably connected inside the guard plates 324. The hopper 325 is used to receive, transport and release the catalyst. The material lifting chain 323 is transmission-connected to the material lifting sprocket 322, and the material lifting sprocket 322 is transmission-connected to the material lifting motor 321. When the material lifting motor 321 brakes, the material lifting sprocket 322 rotates, pulling the material lifting chain 323 to move, and the guard plates 324 are fixed to the material lifting sprocket 322, always perpendicular to the material lifting sprocket 322, and the guard plates 324 are rotationally connected to the center of gravity of the hopper 325, and the hopper 325 always keeps its opening upward;

[0052] Preferably, the discharge rod 33 is arranged on the track frame 314 of the transmission assembly 31 located above, and the hopper 325 on the side close to the transmission assembly 31 moves upward. When the hopper 325 moves to the top and contacts the discharge rod 33, as shown in FIG. Figure 4 and 5 As shown, the discharge rod 33 moves upward and closer to the material lifting assembly 32, and the hopper 325 gradually rises and contacts the side of the discharge rod 33. The rising speed slows down under the action of friction, so that the opening of the hopper 325 tilts toward the transmission assembly 31, thereby pouring the catalyst in the hopper 325 toward the transmission assembly 31, thereby achieving the effect that the discharge rod 33 moves the hopper 325 to tilt the hopper 325 and pour the catalyst onto the transmission assembly 31 located above;

[0053] Preferably, the spray assembly 133 is mounted on the inner wall of the housing 1 through the mounting frame 132. The spray assembly 133 can rotate in the mounting frame 132 to make the sprayed water mist more uniform. The spray assembly 133 is located below the catalyst ash-passing mechanism 3. The dust leaked from the catalyst ash-passing assembly moves downward with the exhaust gas. The water mist sprayed by the spray assembly 133 will wrap the dust to form a water flow.

[0054] Preferably, an exhaust port 134 is provided beside the spray assembly 133 to discharge the exhaust gas after cooling and filtration to the next treatment process, and a sewage outlet 135 is provided below the spray assembly 133 to discharge the sewage after spraying the mixed dust;

[0055] Therefore, by setting a catalyst ash passing mechanism 3 in the ammonia reaction section 13, the catalyst on the lower transfer component 31 is transported back to the upper transfer component 31 through the lifting component 32 and the transfer component 31. When the catalyst is transported by the transfer rods 315 on the transfer component 31, the dust on its surface will fall from the gaps between the transfer rods 315, thereby leaking out of the surface to achieve a catalytic effect and accelerate the denitrification reaction of exhaust gas and ammonia, so as to solve the problem that a large amount of dust contained in the exhaust gas will adhere to the catalyst surface, thereby affecting the catalytic efficiency, reducing the combination efficiency of nitrogen oxides and ammonia, and affecting the reaction rate.

[0056] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A coal-fired engine exhaust gas cooling and filtering integrated device, characterized in that: The invention comprises a shell (1) serving as a cooling and filtering container for tail gas generated by coal combustion, wherein the shell (1) comprises a cooling and dust removal section (11), an ammonia mixing section (12) and an ammonia reaction section (13), wherein the cooling and dust removal section (11) is provided with an air inlet (111) for introducing tail gas to be treated, and a cooling and intercepting mechanism (2) is provided in the air inlet (111) for cooling the introduced tail gas and intercepting dust in the tail gas; in addition, the ammonia mixing section (12) is used to introduce ammonia into the tail gas and guide the ammonia and tail gas to be uniformly mixed; in addition, the ammonia reaction section (13) is provided with a catalyst ash passing mechanism (3) and a spray assembly (133), wherein the catalyst ash passing mechanism (3) is used to circulate and transport a solid catalyst for increasing the denitration rate and remove dust attached to its surface to ensure a catalytic effect, and the spray assembly (133) is used to spray water to carry away dust filtered by the catalyst ash passing mechanism (3); The cooling interception mechanism (2) comprises an interception arc plate (21), wherein the interception arc plate (21) is provided with a plurality of groups and is installed on the inner wall of the housing (1) via a mounting rod (27), wherein a cooling pipeline (22) is interspersed in the interception arc plate (21), wherein the cooling pipeline (22) is connected to a compressor (23), wherein the compressor (23) is used to compress and circulate air so that the hot air transmitted from the cooling pipeline (22) is cooled and then transmitted back again, so that the interception arc plate (21) is continuously cooled to cool the exhaust gas; wherein the interception arc plate (21) is rotatably connected with a plurality of groups of cams (25) above the interception arc plate (21), wherein the cams (25) are arranged on the output shaft of the toggle motor (24), so that the collected dust is shaken off by rotating the cams (25); wherein an ash receiving hopper (26) is arranged below the mounting rod (27), so as to collect the dust shaken off the interception arc plate (21); The catalyst ash-passing mechanism (3) comprises a transmission component (31), a lifting component (32) and a discharge rod (33), wherein the transmission component (31) is provided with at least two groups, an upper group and an lower group, wherein the transmission component (31) located at the upper side transports the catalyst to the transmission component (31) located at the lower side, and the lifting component (32) is used to receive the catalyst transmitted by the transmission component (31) located at the lower side, and transport the catalyst back to the transmission component (31) located at the upper side, so as to realize the circulation of the catalyst and remove the dust attached to the surface of the catalyst; The transmission assembly (31) comprises a transmission chain (313), on which a plurality of transmission rods (315) are arranged, and gaps are left between the transmission rods (315) to ensure that dust in the exhaust gas can fall through the gaps during the catalyst transportation process; the transmission chain (313) is drivingly connected to a transmission sprocket (312), the transmission sprocket (312) is connected to a driving shaft of a transmission motor (311), and the transmission chain (313) is slidably connected to a track provided on a track frame (314); The material lifting assembly (32) includes a material lifting sprocket (322), a plurality of guard plates (324) are fixed on the material lifting chain, a hopper (325) is rotatably connected inside the guard plate (324), and the hopper (325) is used to receive, transport and release the catalyst; the material lifting chain is drivingly connected to the material lifting sprocket (322), and the material lifting sprocket (322) is drivingly connected to the material lifting motor (321); The discharge rod (33) is arranged on the track frame (314) of the transmission assembly (31) located above, and is used to move the hopper (325) so that the hopper (325) is tilted to pour the catalyst onto the transmission assembly (31) located above.

2. The integrated cooling and filtering device for exhaust gas from a coal-fired engine according to claim 1, characterized in that: The ammonia mixing section (12) is provided with an ammonia releasing component (121) for releasing ammonia required for the denitration reaction; an air evacuation plate (122) is provided above the ammonia releasing component (121) for evacuating the ammonia sprayed out by the ammonia releasing component (121); and an air guide plate (123) is provided at the connection between the ammonia mixing section (12) and the ammonia reaction section (13) for uniformly introducing the tail gas mixed with ammonia into the ammonia reaction section (13).

3. The integrated cooling and filtering device for exhaust gas from a coal-fired engine according to claim 1, characterized in that: The spray assembly (133) is mounted on the inner wall of the housing (1) via a mounting frame (132), and the spray assembly (133) is located below the catalyst ash-passing mechanism (3).

4. The integrated cooling and filtering device for exhaust gas from a coal-fired engine according to claim 3, characterized in that: An exhaust port (134) is provided beside the spray component (133) for discharging tail gas after cooling and filtration to the next treatment process, and a sewage outlet (135) is provided below the spray component (133) for discharging sewage after spraying mixed dust.

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