Coal gas treatment system

Abstract

The invention relates to the technical field of gas treatment, in particular to a gas treatment system which comprises a desulfurizing tower, a gas inlet pipe is arranged at the lower end of the desulfurizing tower, and a gas outlet is formed in the upper end of the desulfurizing tower; the first desulfurization mechanism is arranged at the lower part of the reaction cavity and is used for carrying out primary desulfurization on the coal gas; the second desulfurization mechanism is arranged in the reaction cavity above the first desulfurization mechanism, and the coal gas subjected to primary desulfurization is mixed with a desulfurization agent at the second desulfurization mechanism to form a mixed jet flow so as to increase the contact area of the coal gas and the desulfurization agent for secondary desulfurization; the spraying mechanism is arranged in the reaction cavity above the second desulfurization mechanism and is used for spraying and desulfurizing the coal gas desulfurized by the second desulfurization mechanism and providing a desulfurizing agent for the second desulfurization mechanism and the first desulfurization mechanism; the driving mechanism is used for driving the coal gas and the desulfurizing agent to be mixed in the second desulfurizing mechanism to form mixed jet flow. According to the scheme, the coal gas is desulfurized for many times, desulfurization is more thorough, and the desulfurization effect is better.

Description

Technical Field

[0001] The present invention relates to the technical field of coal gas processing, and in particular to a coal gas processing system. Background Art

[0002] my country is a major coal consumer. The combustion of combustibles in boilers produces coal gas, which is one of the main emissions from thermal power plants. Since coal gas usually contains a large amount of nitrogen oxides NOX, sulfides SO2 and dust, it will cause highly corrosive acid rain on the one hand, and the dust emitted will cause air pollution and harm health on the other hand. Therefore, coal gas must be desulfurized, denitrated and dusted before it is discharged.

[0003] Existing coal gas desulfurization treatment usually adopts spraying in a desulfurization tower. However, the desulfurizer liquid particles sprayed by the spraying method are large and cannot be evenly distributed in the tower. Therefore, it will cause insufficient contact between the coal gas and the sprayed desulfurizer liquid particles, resulting in low desulfurization efficiency. Summary of the invention

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a coal gas treatment system to solve the problem of insufficient contact between coal gas and desulfurizer and low desulfurization rate caused by spray desulfurization in the prior art.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: a coal gas processing system, comprising:

[0006] A desulfurization tower, wherein a reaction chamber for desulfurization reaction is provided inside, an air inlet pipe connected to the reaction chamber is provided at the lower end of the desulfurization tower, and an air outlet connected to the reaction chamber is provided at the upper end;

[0007] A first desulfurization mechanism, disposed at the lower part of the reaction chamber, for performing primary desulfurization on the coal gas;

[0008] The second desulfurization mechanism is arranged in the reaction chamber above the first desulfurization mechanism, and the coal gas after the primary desulfurization is mixed with the desulfurizer at the second desulfurization mechanism to form a mixed jet to increase the contact area between the coal gas and the desulfurizer for secondary desulfurization;

[0009] A spray mechanism, arranged in the reaction chamber above the second desulfurization mechanism, for spraying and desulfurizing the coal gas desulfurized by the second desulfurization mechanism and providing a desulfurizer to the second desulfurization mechanism and the first desulfurization mechanism;

[0010] The driving mechanism is used for driving the coal gas and the desulfurizing agent to mix in the second desulfurizing mechanism to form a mixed jet.

[0011] Furthermore, the driving mechanism includes a boost pump arranged on the intake pipe.

[0012] Further, the second desulfurization mechanism includes a sealing plate horizontally arranged and sealed and fixedly connected to the inner wall of the desulfurization tower, a plurality of liquid collecting grooves arranged on the upper surface of the sealing plate in parallel along the radial direction of the sealing plate, a diffusion groove, a roof plate arranged on the diffusion groove, a plurality of air flow holes arranged in the diffusion groove and vertically penetrating the sealing plate, drainage holes arranged in the liquid collecting groove and vertically penetrating the sealing plate corresponding to the air flow holes, and a transverse hole arranged in the sealing plate to connect the drainage hole with the air flow hole;

[0013] The liquid collecting troughs and the diffusion troughs are alternately arranged adjacent to each other in sequence, both of which are inverted trapezoidal troughs, the lower section of the air flow hole is set as a conical hole section, the inner diameter of the transverse hole is smaller than the air flow hole, both ends of the roof plate in the length direction facing the diffusion trough are sealed and fixedly connected to the inner wall of the desulfurization tower, and both ends of the roof plate in the width direction facing the diffusion trough are inclined downward and leave a gap between them and the sealing plate.

[0014] Furthermore, the second desulfurization mechanism also includes a desulfurization contact piece arranged in the gap between the roof plate and the sealing plate, and the desulfurization contact piece includes a breathable frame and a porous body filled in the breathable frame. Both ends of the breathable frame in the length direction of the diffusion groove are connected to the inner wall of the desulfurization tower, the upper end of the breathable frame is connected to the lower end of one side of the roof plate, and the lower end of the breathable frame is fixedly connected to the upper surface of the sealing plate.

[0015] When the desulfurizer sprayed from the nozzle falls on the roof panel, it flows along the surface of the roof panel through the porous body 2 in the air-permeable outer frame, then flows into the collecting tank and drips downward through the drainage hole. When the coal gas after mixed atomization and desulfurization continues to drift upward through the porous body 2 on both sides of the diffusion groove, it contacts the desulfurizer in the porous body 2 again to carry out a desulfurization reaction.

[0016] Furthermore, the first desulfurization mechanism includes a breathable tray and a porous body arranged in the breathable tray, the outer peripheral surface of the breathable tray is sealed and fixedly connected to the inner wall of the desulfurization tower, a plurality of breathable channels connecting the upper and lower spaces of the breathable tray are arranged on the bottom plate of the breathable tray, and a drain pipe for discharging the desulfurizer in the breathable tray to the outside of the desulfurization tower is arranged at the bottom of the breathable tray.

[0017] Furthermore, a plurality of support columns for supporting the porous body 1 are evenly distributed on the inner bottom surface of the breathable tray, the lower end of the breathable channel is connected to the space below the breathable tray, and the upper end of the breathable channel transversely penetrates the side wall of the support column.

[0018] Furthermore, the bottom plate of the breathable tray is configured to be an inverted cone.

[0019] Furthermore, the spray mechanism includes a liquid inlet pipe connected to a desulfurizing agent source outside the desulfurization tower, a plurality of liquid inlet branches connected to the liquid inlet pipe, and a plurality of spray nozzles connected to each of the liquid inlet branches.

[0020] Furthermore, a liquid distribution pipe connected to the liquid discharge hole is arranged below the liquid discharge hole, and a plurality of liquid outlet holes are evenly distributed on the liquid distribution pipe.

[0021] Furthermore, a defoamer is provided above the spray mechanism.

[0022] The working principle of the present invention is as follows:

[0023] First, the desulfurizer is sprayed into the desulfurization tower through the spraying mechanism. The desulfurizer drips on the sealing plate and collects in the liquid collecting tank and flows into the liquid distribution pipe through the drainage hole. The desulfurizer dripping on the roof plate flows into the porous body 2 in the air permeable frame, so that the porous body 2 is enriched with the desulfurizer and then flows into the liquid collecting tank. The desulfurizer flows out from the dispersed and evenly distributed liquid outlet holes on the liquid distribution pipe and falls into the porous body 1 below, so that the porous body 1 is enriched with the desulfurizer. After the desulfurizer is enriched in the porous body 1, the desulfurizer gathers in the middle of the bottom plate of the air permeable tray and is discharged out of the desulfurization tower through the drainage pipe.

[0024] After the desulfurizer sprayed by the spray mechanism flows to the drain pipe, the coal gas to be treated is introduced into the reaction chamber in the desulfurization tower through the air inlet pipe. At the same time, the booster pump is turned on to increase the pressure in the reaction chamber to force the coal gas to enter the porous body one through the air permeable channel to be dispersed and contact the desulfurizer in the porous body one for desulfurization. Under the pressure of the booster pump, the coal gas that has undergone initial desulfurization is forced to quickly flow through the gas flow hole after passing through the porous body one. Since the lower section of the gas flow hole is set as a tapered hole section and the upper part is connected to the diffusion groove, the flow rate of the coal gas is accelerated when passing through the upper section of the gas flow hole to form a high-speed airflow and generate negative pressure. The negative pressure generated at the upper section of the gas flow hole The pressure is applied to the transverse holes with smaller inner diameter to suck part of the desulfurizer flowing through the drainage hole into the upper inner cavity of the airflow hole and mix it with the coal gas to form a high-speed jet of gas-liquid mixture. When the high-speed jet of gas-liquid mixture sprays out of the upper end of the airflow hole and enters the diffusion groove, the flow velocity of the high-speed jet of gas-liquid mixture decreases and the pressure increases due to the sudden increase in space. The changes in pressure and flow velocity cause the desulfurizer to form a mist spray at the diffusion groove. The mist desulfurizer and the coal gas form turbulent flow and are dispersed in the narrow space between the roof plate and the diffusion groove, which increases the contact probability and contact area between the desulfurizer and the coal gas and accelerates the desulfurization rate.

[0025] When the second-desulfurized coal gas flows outward through the porous body 2 in the air-permeable frame, it contacts the desulfurizer in the porous body 2 for the third desulfurization. After the third desulfurization, the coal gas finally contacts the desulfurizer sprayed from the nozzle for the fourth contact desulfurization and flows out from the gas outlet. The demister intercepts the desulfurizer mixed in the coal gas.

[0026] In this scheme, since the cross-section of the reaction chamber in the desulfurization tower is much larger than the sum of the cross-sections of the air flow holes, the flow rate of the coal gas outside the air flow holes is still relatively slow. The function of the booster pump is to force the coal gas to flow quickly through the air flow holes and will not cause the coal gas to flow quickly in the reaction chamber.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] 1. In this scheme, the coal gas undergoes four desulfurization treatments, which makes the desulfurization more thorough;

[0029] 2. In this scheme, the coal gas in the initial desulfurization is dispersed and slowed down in the porous body rich in desulfurizer to contact with the desulfurizer for desulfurization, thereby extending the contact time and improving the desulfurization efficiency;

[0030] 3. In this scheme, the second desulfurization mechanism is set to separate the gas and liquid first and then mix them, so that the coal gas after the initial desulfurization is accelerated and atomized after mixing with the desulfurizer in the gas flow hole, and a turbulent flow of gas and mist is formed in the diffusion tank, which increases the contact area and contact probability between the coal gas and the desulfurizer, and further improves the desulfurization efficiency;

[0031] 4. In this scheme, the coal gas flow that has undergone secondary desulfurization is contact-desulfurized once again when passing through the porous body 2 and finally contact-desulfurized with the desulfurizer sprayed from the nozzle, so that the desulfurization is more thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 It is a schematic diagram of the structure of the gas treatment system of the present invention in the main viewing direction.

[0034] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0035] Figure 3 for Figure 1 Enlarged view of part B in the middle.

[0036] Figure 4 for Figure 1 Middle AA section view.

[0037] Figure 5 It is a schematic diagram of the spray mechanism structure from the top view.

[0038] The meanings of the symbols in the accompanying drawings are:

[0039] Desulfurization tower-10; reaction chamber-101; air inlet-102; air outlet-103;

[0040] The first desulfurization mechanism-20; a breathable tray-201; a porous body-202; a support column-203; a breathable channel-2031; a drain pipe-204;

[0041] Second desulfurization mechanism-30; sealing plate-301; liquid collecting tank-302; drainage hole-3021; ​​diffusion tank-303; air flow hole-3031; roof plate-304; transverse hole-305; desulfurization contact piece-306; air permeable frame-3061; porous body 2-3062;

[0042] Spraying mechanism-40; liquid inlet pipe-401; liquid inlet branch pipe-402; spray head-403;

[0043] Booster pump - 50;

[0044] Defoamer - 60;

[0045] Liquid distribution pipe-70; liquid outlet hole-701. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0048] A gas processing system of this embodiment, such as Figure 1-Figure 5 As shown, including:

[0049] The desulfurization tower 10 is a vertically arranged cylindrical structure with closed ends. The desulfurization tower 10 has a cavity inside to form a reaction chamber 101 for desulfurization reaction. An air inlet pipe 102 is provided on the lower side wall of the desulfurization tower 10 to connect the external space of the desulfurization tower 10 with the reaction chamber 101. The air inlet pipe 102 is provided with a booster pump 50 for pressurizing the reaction chamber 101. The booster pump 50 is a conventional air booster pump for increasing the air pressure in the lower inner cavity of the reaction chamber 101. Pressure, the upper end of the desulfurization tower 10 is provided with an outlet 103 which connects the external space of the desulfurization tower 10 with the reaction chamber 101. In order to facilitate personnel to enter the desulfurization tower for maintenance, the side wall of the desulfurization tower 10 is provided with an openable or closable inspection port (not shown). The reaction chamber 101 is provided with a first desulfurization mechanism 20, a second desulfurization mechanism 30 and a spraying mechanism 40 for desulfurizing the coal gas which is pressurized into the reaction chamber 101 through the air inlet pipe 102, from bottom to top.

[0050] The first desulfurization mechanism 20 is arranged at the lower part of the reaction chamber 101, and is used for performing initial desulfurization on the coal gas. The first desulfurization mechanism 20 includes a U-shaped air permeable tray 201 and a sponge-like porous body 202 arranged in the air permeable tray 201. The porous body 202 is a columnar body adapted to the inner cavity of the air permeable tray 201. The bottom plate of the air permeable tray 201 is set to an inverted cone shape. The outer peripheral surface of the air permeable tray 201 is sealed and fixedly connected to the inner wall of the desulfurization tower 10. A plurality of support columns 203 for supporting the porous body 202 are evenly distributed on the inner bottom surface of the air permeable tray 201. A plurality of air permeable channels 2031 are provided to connect the upper and lower spaces of the air permeable tray 201. The lower ends of the air permeable channels 2031 are connected to the space below the air permeable tray 201. The upper ends of the air permeable channels 2031 transversely penetrate the side walls of the support columns 203. A drain pipe 204 is provided at the bottom of the air permeable tray 201. One end of the drain pipe 204 is located in the middle of the bottom plate of the air permeable tray 201 and is connected to the inner cavity of the air permeable tray 201. The other end of the drain pipe 204 extends out of the desulfurization tower 10. When the desulfurizer accumulates on the bottom plate of the air permeable tray 201, the drain pipe 204 discharges the desulfurizer in the air permeable tray 201 to the outside of the desulfurization tower 10.

[0051] The second desulfurization mechanism 30 is arranged in the reaction chamber 101 above the first desulfurization mechanism 20. The second desulfurization mechanism 30 is used to mix the coal gas after the initial desulfurization with the desulfurizer at the second desulfurization mechanism 30 to form a mixed jet to increase the contact area between the coal gas and the desulfurizer for secondary desulfurization. Specifically, the second desulfurization mechanism 30 includes a sealing plate 301 horizontally arranged and sealed and fixedly connected to the inner wall of the desulfurization tower 10, and a sealing plate 301 arranged on the upper surface of the sealing plate 301 in parallel with the radial direction of the sealing plate 301. The plurality of liquid collecting grooves 302, diffusion grooves 303, a roof plate 304 arranged above the diffusion grooves 303, a plurality of air flow holes 3031 arranged in the diffusion grooves 303 and vertically penetrating the sealing plate 301, drainage holes 3021 arranged in the liquid collecting grooves 302 and vertically penetrating the sealing plate 301 corresponding to the air flow holes 3031, and transverse holes 305 arranged in the sealing plate 301 and connecting the drainage holes 3021 with the air flow holes 3031, are combined with Figure 1 , Figure 4 As shown, the liquid collecting trough 302 and the diffusion trough 303 are alternately arranged adjacent to each other, the liquid collecting trough 302 and the diffusion trough 303 are both inverted trapezoidal troughs, the lower section of the airflow hole 3031 is set as a tapered hole section that diffuses downward, the inner diameter of the transverse hole 305 is smaller than the airflow hole 3031, one end of the transverse hole 305 is connected to the upper end inner cavity of the airflow hole 3031, and the other end of the transverse hole 305 is connected to the drainage hole 3021, the roof plate 304 is set corresponding to the diffusion trough 303, the roof plate 304 covers the top of the diffusion trough 303, both ends of the roof plate 304 in the length direction of the diffusion trough 303 are sealed and fixedly connected to the inner wall of the desulfurization tower 10, and both ends of the roof plate 304 in the width direction of the diffusion trough 303 are inclined downward and are sealed A gap is left between the plates 301, and a desulfurization contact piece 306 is arranged in the gap between the roof plate 304 and the sealing plate 301, and the desulfurization contact piece 306 includes an air-permeable frame 3061 and a sponge-like porous body 3062 filled in the air-permeable frame 3061, and both ends of the air-permeable frame 3061 in the length direction of the diffusion groove 303 are connected to the inner wall of the desulfurization tower 10, the upper end of the air-permeable frame 3061 is fixedly connected to the lower end of one side of the roof plate 304, and the lower end of the air-permeable frame 3061 is fixedly connected to the upper surface of the sealing plate 301, and a liquid distribution pipe 70 connected to the liquid distribution hole 3021 is arranged below the liquid discharge hole 3021, and the liquid distribution pipe 70 is fixedly connected to the sealing plate 301, and a plurality of liquid outlet holes 701 are evenly distributed on the liquid distribution pipe 70.

[0052] The spray mechanism 40 is disposed in the reaction chamber 101 above the second desulfurization mechanism 30. The spray mechanism 40 is used to spray desulfurize the coal gas desulfurized by the second desulfurization mechanism 30 and provide a desulfurizer to the second desulfurization mechanism 30 and the first desulfurization mechanism 20. Specifically, Figure 5 As shown, the spray mechanism 40 includes a liquid inlet pipe 401 connected to a desulfurizing agent source outside the desulfurizing tower 10, a plurality of liquid inlet branches 402 connected to the liquid inlet pipe 401, and a plurality of nozzles 403 connected to each of the liquid inlet branches 402. The liquid inlet pipe 401 is fixedly connected to the desulfurizing tower 10, and the desulfurizing agent in the external desulfurizing agent source enters each of the liquid inlet branches 402 through the liquid inlet pipe 401 and is sprayed downward by each of the nozzles 403. A defoamer 60 is also provided in the reaction chamber 101 above the spray mechanism 40 to intercept the desulfurizing agent mixed in the coal gas and prevent the desulfurizing agent from overflowing the desulfurizing tower 10.

[0053] The working principle of the present invention is as follows:

[0054] First, the desulfurizer is sprayed into the desulfurization tower 10 through the spray mechanism 40. The desulfurizer drips on the sealing plate 301, collects in the liquid collecting tank 302, and flows into the liquid distribution pipe 70 from the drainage hole 3021. The desulfurizer drips on the roof plate 304 and flows into the porous body 2 3062 in the air permeable frame 3061, so that the porous body 2 3062 is enriched with desulfurizer, and then flows into the collecting tank 302. The desulfurizer flows out from the dispersed and evenly distributed liquid outlet holes 701 on the liquid distribution pipe 70 and falls into the porous body 1 202 below, so that the porous body 1 is enriched with desulfurizer. After the desulfurizer is enriched in the porous body 1, the desulfurizer is gathered in the middle of the bottom plate of the air permeable tray 201 and discharged out of the desulfurization tower 10 through the drainage pipe 204.

[0055] After the desulfurizer sprayed by the spray mechanism 40 flows to the drain pipe 204, the coal gas to be treated is introduced into the reaction chamber 101 in the desulfurization tower 10 through the air inlet pipe 102. At the same time, the booster pump 50 is turned on to increase the pressure in the reaction chamber 101, forcing the coal gas to enter the porous body 202 through the air permeable channel 2031 to be dispersed and contact with the desulfurizer in the porous body 202 for desulfurization. The coal gas that has undergone initial desulfurization under the pressure of the booster pump 50 is forced to quickly flow upward through the air flow hole 3031 after passing through the porous body 202. Since the lower section of the air flow hole 3031 is set as a cone hole and the upper part is connected to the diffusion groove 303, the flow rate of the coal gas is accelerated when passing through the upper inner cavity of the air flow hole 3031 to form a high-speed airflow and generate negative pressure. The negative pressure generated at the upper air flow hole 3031 draws the desulfurizer flowing through the drainage hole 3021 into the upper inner cavity of the air flow hole 3031 through the transverse hole 305 with a smaller inner diameter, and mixes with the coal gas to form a high-speed jet of gas-liquid mixture. When the high-speed jet of gas-liquid mixture sprays out of the upper end of the air flow hole 3031 and enters the diffusion groove 303, the flow velocity of the high-speed jet of gas-liquid mixture decreases and the pressure increases due to the sudden increase in space. Such changes in pressure and flow velocity cause the desulfurizer to form a mist spray at the diffusion groove 303. The mist desulfurizer and the coal gas form turbulent flow and are dispersed in the narrow space between the roof panel 304 and the diffusion groove 303, thereby increasing the contact probability and contact area between the desulfurizer and the coal gas and accelerating the desulfurization rate.

[0056] When the second-desulfurized coal gas flows outward through the porous body 2 3062 in the air-permeable frame 3061, it contacts the desulfurizer in the porous body 2 3062 for a third desulfurization. After the third desulfurization, the coal gas finally contacts the desulfurizer sprayed from the nozzle 403 for a fourth contact desulfurization and flows out from the gas outlet 103. The demister 60 intercepts the desulfurizer mixed in the coal gas.

[0057] In this solution, since the cross-sectional area of ​​the reaction chamber 101 in the desulfurization tower 10 is much larger than the sum of the cross-sectional areas of the gas holes 3031, the flow rate of the coal gas outside the gas holes 3031 is still relatively slow. The function of the booster pump 50 is to force the coal gas to flow quickly through the gas holes 3031 and will not cause the coal gas to flow quickly in the reaction chamber 101. In this solution, the power of the booster pump 50 can be adjusted and an appropriate number of gas holes 3031 can be set to force the coal gas to flow quickly in the gas holes 3031 and flow slowly in the reaction chamber.

[0058] The above are only embodiments of the present invention, and the common knowledge such as the known specific structures and characteristics in the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A coal gas processing system, comprising a desulfurization tower having a reaction chamber therein, wherein an air inlet pipe is arranged at the lower end of the desulfurization tower, and an air outlet is arranged at the upper end of the desulfurization tower, characterized in that: Also includes: A first desulfurization mechanism, disposed at the lower part of the reaction chamber, for performing primary desulfurization on the coal gas; The second desulfurization mechanism is arranged in the reaction chamber above the first desulfurization mechanism, and the coal gas after the primary desulfurization is mixed with the desulfurizer at the second desulfurization mechanism to form a mixed jet to increase the contact area between the coal gas and the desulfurizer for secondary desulfurization; A spray mechanism, arranged in the reaction chamber above the second desulfurization mechanism, for spraying and desulfurizing the coal gas desulfurized by the second desulfurization mechanism and providing a desulfurizer to the second desulfurization mechanism and the first desulfurization mechanism; The driving mechanism is used for driving the coal gas and the desulfurizing agent to mix in the second desulfurizing mechanism to form a mixed jet.

2. The gas processing system according to claim 1, characterized in that: The driving mechanism includes a boost pump arranged on the air intake pipe.

3. The gas processing system according to claim 2, characterized in that: The second desulfurization mechanism comprises a sealing plate arranged horizontally and sealed and fixedly connected to the inner wall of the desulfurization tower, a plurality of liquid collecting grooves arranged on the upper surface of the sealing plate in parallel with the radial direction of the sealing plate, a diffusion groove, a roof plate arranged on the diffusion groove, a plurality of air flow holes arranged in the diffusion groove and vertically penetrating the sealing plate, drainage holes arranged in the liquid collecting groove and vertically penetrating the sealing plate corresponding to the air flow holes, and a transverse hole arranged in the sealing plate to connect the drainage hole with the air flow hole; The liquid collecting troughs and the diffusion troughs are alternately arranged adjacent to each other in sequence, both of which are inverted trapezoidal troughs, the lower section of the air flow hole is arranged in a conical hole shape, both ends of the roof plate in the length direction facing the diffusion trough are sealed and fixedly connected to the inner wall of the desulfurization tower, and both ends of the roof plate in the width direction facing the diffusion trough are inclined downward and leave a gap between them and the sealing plate.

4. The gas processing system according to claim 3, characterized in that: The second desulfurization mechanism also includes a desulfurization contact piece arranged in the gap between the roof plate and the sealing plate, and the desulfurization contact piece includes a breathable frame and a porous body filled in the breathable frame. Both ends of the breathable frame in the length direction of the diffusion groove are connected to the inner wall of the desulfurization tower, the upper end of the breathable frame is connected to the lower end of one side of the roof plate, and the lower end of the breathable frame is fixedly connected to the upper surface of the sealing plate.

5. The gas processing system according to claim 1, characterized in that: The first desulfurization mechanism includes a breathable tray and a porous body arranged in the breathable tray. The outer peripheral surface of the breathable tray is sealed and fixedly connected to the inner wall of the desulfurization tower. A plurality of breathable channels connecting the upper and lower spaces of the breathable tray are arranged on the bottom plate of the breathable tray. A drain pipe is arranged at the bottom of the breathable tray to discharge the desulfurizer in the breathable tray to the outside of the desulfurization tower.

6. The coal gas processing system according to claim 5, characterized in that: The inner bottom surface of the breathable tray is evenly distributed with a plurality of support columns for supporting the porous body 1, the lower end of the breathable channel is connected with the lower space of the breathable tray, and the upper end of the breathable channel horizontally penetrates the side wall of the support column.

7. The coal gas processing system according to claim 6, characterized in that: The bottom plate of the air-permeable tray is configured to be in an inverted cone shape.

8. The coal gas processing system according to claim 1, characterized in that: The spray mechanism comprises a liquid inlet pipe connected to a desulfurizing agent source outside the desulfurization tower, a plurality of liquid inlet branches connected to the liquid inlet pipe, and a plurality of spray nozzles connected to each of the liquid inlet branches.

9. The coal gas processing system according to claim 3, characterized in that: A liquid distribution pipe connected with the liquid discharge hole is arranged below the liquid discharge hole, and a plurality of liquid outlet holes are evenly distributed on the liquid distribution pipe.

10. The coal gas processing system according to claim 1, characterized in that: A defoamer is arranged above the spray mechanism.

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