Tail gas treatment device for abrasive cloth drying

Abstract

The utility model relates to an abrasive cloth drying tail gas treatment device which comprises a drying room, an air inlet pipe and an air return pipe are arranged on the drying room, a first circulating conveying pipe is arranged on the air inlet pipe and the air return pipe, and the first circulating conveying pipe is provided with a first adjusting valve, a first tail gas conveying pipe, an air mixer, a first fan and an electric heater. The air mixer comprises a shell, a gas conveying elbow, a gas mixing cone and a spiral blade, a first air conveying pipe is arranged on the gas conveying elbow, a second adjusting valve is arranged on the first air conveying pipe, a third adjusting valve, a first air cooling type heat exchanger, a filtering tank, a second fan and a water cooling tower are arranged on the first tail gas conveying pipe, and the water cooling tower communicates with an adsorption tank; a zeolite layer is arranged in the adsorption tank, the filtering tank comprises a tank body, a gas inlet pipe, a microporous filter plate and a gas outlet pipe, and the gas inlet pipe adopts a Venturi pipe. Glue liquid which is liquefied again due to cooling in exhausted hot air is prevented from carrying sand powder to be attached to a filler layer of the water washing tower. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas treatment equipment for sand cloth drying, and specifically to an exhaust gas treatment device for sand cloth drying. Background Technology

[0002] Abrasive cloth has wide applications in industry and daily life, with numerous manufacturers and relatively unchanged production processes and equipment over the years. The crucial steps in abrasive cloth production include applying adhesive, preparing the abrasive, and then drying it. The drying process involves hot air being supplied to a drying chamber to heat the abrasive cloth. The heated air is then expelled from the chamber and reheated by a heating device, creating a continuous heating cycle that keeps the abrasive cloth heated. This hot air circulation process saves significantly more energy compared to methods that involve heating and then expelling the hot air. Furthermore, the hot air circulation effectively displaces the moisture that evaporates from both the top and bottom surfaces of the heated abrasive cloth, facilitating the drying of the adhesive layer.

[0003] Although the hot air carries continuously evaporating moisture during its discharge, this moisture merges with the circulating hot air, leading to an increasingly higher moisture content. This increased moisture content raises the saturated vapor pressure of the corresponding components in the uncured adhesive layer, requiring more heat energy to cure the adhesive layer in the sandpaper. Therefore, the volatile components in the hot air stream during circulation should be maintained within a suitable range to facilitate the volatilization of volatile components in the adhesive layer. Existing technologies utilize exhaust pipes to partially discharge hot air and replenish fresh air, maintaining a suitable range for volatile components in the hot air stream. However, since the hot air stream also carries some sand powder, the process of washing the discharged hot air using a water washing tower causes the gaseous components volatilized from the adhesive layer in the exhaust stream to liquefy again and adhere to the packing layer inside the water washing tower. During this process, sand powder in the hot air stream adheres to the reliquefied adhesive layer, increasing the flow resistance of the packing layer. Cleaning the packing layer of the water washing tower is very time-consuming and labor-intensive. Therefore, there is room for improvement in the existing technology to overcome the above-mentioned defects and reduce the frequency of equipment maintenance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a tail gas treatment device that can reduce the amount of sand powder carried by the liquefied adhesive that is reliquefied after cooling and adheres to the packing layer of the water washing tower during the drying of exhaust hot gas, thereby overcoming the defects in existing technologies.

[0005] The technical solution adopted by this utility model is as follows: a tail gas treatment device for drying abrasive cloth, including a drying chamber, on which an air inlet pipe and a return air pipe are provided. A first circulation conveying pipe is provided on the air inlet pipe and the return air pipe. A first regulating valve, an inlet end of the first tail gas conveying pipe, a mixer, a first fan, and an electric heater are sequentially arranged along the direction from the return air pipe to the air inlet pipe on the first circulation conveying pipe. The mixer includes a shell and an air delivery bend, a mixing cone, and a spiral blades sequentially arranged along the direction from the inlet end to the outlet end of the shell inside the shell. A first air supply is provided on the air delivery bend. The first air delivery pipe is equipped with a second regulating valve. The first exhaust gas delivery pipe is sequentially equipped with a third regulating valve, a heat source channel of the first air-cooled heat exchanger, a filter tank, a second fan, and the inlet end of a water-cooled tower along the direction from near the first circulating delivery pipe to away from the first circulating delivery pipe. The outlet end of the water-cooled tower is connected to an adsorption tank, which contains a zeolite layer. The filter tank includes a tank body, an air inlet pipe on the tank body, a microporous filter plate inside the tank above the air inlet pipe, and an air outlet pipe on the tank body above the microporous filter plate. The air inlet pipe is a Venturi tube.

[0006] Preferably, the water-cooled tower includes a tower body, a water washing unit disposed within the tower body, and a wire mesh coalescing net disposed above the water washing unit within the tower body. The number of water washing units is several, and each water washing unit includes a water supply pipe disposed on the tower body, a nozzle disposed on the water supply pipe inside the tower body, and a packing layer disposed below the nozzle within the tower body.

[0007] Preferably, a first online chromatograph and a first gas flow sensor are installed on the first circulation conveying pipe between the first regulating valve and the first exhaust gas conveying pipe; a temperature sensor and a second online chromatograph are installed on the first circulation conveying pipe between the electric heater and the air inlet pipe; a second gas flow sensor and a first air filter are sequentially installed on the first air conveying pipe along the direction from near the air mixer to away from the air mixer; the second regulating valve is located between the second gas flow sensor and the first air filter; and a third gas flow sensor is installed on the first exhaust gas conveying pipe between the third regulating valve and the first air-cooled heat exchanger.

[0008] Preferably, the adsorption tanks are of several types, each containing a zeolite layer. The inlet ends of the adsorption tanks and the outlet ends of the water-cooling tower are connected by first delivery branch pipes. A second tail gas delivery pipe is installed at the outlet ends of the adsorption tanks. A third fan and a third online chromatograph are installed on the second tail gas delivery pipes. The outlet ends of the adsorption tanks and the second tail gas delivery pipes are connected by second delivery branch pipes. A first shut-off valve is installed on each of the second delivery branch pipes and the first delivery branch pipes.

[0009] Preferably, each of the adsorption tanks has an inlet end of a third conveying branch pipe at its inlet end, and each of the adsorption tanks has an outlet end of a fourth conveying branch pipe at its outlet end. A second shut-off valve is provided on each of the fourth and third conveying branch pipes. A second circulation conveying pipe is provided on the inlet end of the fourth and third conveying branch pipes and at the outlet end of the third conveying branch pipes. Along the direction from the third to the fourth conveying branch pipes, the second circulation conveying pipes sequentially include a fourth regulating valve, the outlet end of a second air conveying pipe, a heat source channel for a second air-cooled heat exchanger, a fourth fan, a catalytic combustion furnace, and the inlet end of a third tail gas conveying pipe. A fifth regulating valve is provided on the third tail gas conveying pipe. The catalytic combustion furnace includes a furnace body and a silicon-carbon heating tube and a palladium catalyst layer disposed within the furnace body.

[0010] Preferably, a fourth gas flow sensor and a fourth online chromatograph are installed on the second circulation pipe between the fourth regulating valve and the first air delivery pipe, and a fifth gas flow sensor, a sixth regulating valve, a fifth fan, and a second air filter are installed on the second air delivery pipe.

[0011] The beneficial effects of this utility model are as follows: First, by circulating a portion of the hot airflow in the first circulating conveying pipe connected to the drying chamber through the first exhaust gas conveying pipe, the exhaust hot air exchanges heat with the air through the heat source channel of the first air-cooled heat exchanger. A large amount of liquefiable medium is liquefied and enriched in the tank. Under the action of the microporous filter plate and the liquid enriched in the tank, a small amount of sand particles carried by the exhaust hot air are enriched in the tank below the microporous filter plate. This reduces the content of components that can be re-formed into adhesive liquid when transported to the water cooling tower, thereby reducing the problem of increased flow resistance of the water cooling tower packing layer caused by sand particles adhering to the medium due to liquefaction of the medium, and reducing the maintenance frequency of the water cooling tower packing layer.

[0012] Secondly, the fourth gas flow sensor and the fourth online chromatograph are installed on the second circulation pipeline between the fourth regulating valve and the first air delivery pipeline of this utility model. The installation of the fourth gas flow sensor facilitates the feedback of flow parameters, and the installation of the fourth online chromatograph facilitates the feedback of component parameters.

[0013] Furthermore, the second air delivery pipe of this utility model is equipped with a fifth gas flow sensor, a sixth regulating valve, a fifth fan, and a second air filter; the installation of the second air filter facilitates the filtration of the air entering the second air delivery pipe.

[0014] This utility model has a simple structure, is easy to operate, and has a clever design, which greatly improves work efficiency and has good social and economic benefits. It is a product that is easy to promote and use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 for Figure 1 A magnified view of detail A.

[0017] Figure 3 for Figure 1 A magnified view of detail B.

[0018] Figure 4 for Figure 1 A magnified view of detail C. Detailed Implementation

[0019] like Figures 1 to 4 As shown, a tail gas treatment device for drying abrasive cloth includes a drying chamber 1. The drying chamber 1 is equipped with an air inlet pipe 2 and a return air pipe 3. A first circulating conveying pipe 4 is installed on the air inlet pipe 2 and the return air pipe 3. Along the direction from the return air pipe 3 to the air inlet pipe 2, the first circulating conveying pipe 4 is sequentially equipped with a first regulating valve 5, the inlet end of a first tail gas conveying pipe 6, a mixer, a first fan 7, and an electric heater 8. The mixer includes a housing 9 and, within the housing 9, a gas delivery bend 10, a mixing cone 11, and a spiral blade 12 sequentially arranged along the direction from the inlet end to the outlet end of the housing 9. A first air conveying pipe 13 is installed on the gas delivery bend 10. A second regulating valve 14 is provided on the 13. The first exhaust gas conveying pipe 6 is sequentially provided with a third regulating valve 15, a heat source channel of the first air-cooled heat exchanger 16, a filter tank, a second fan 17 and the inlet end of the water-cooled tower along the direction from near the first circulating conveying pipe 4 to away from the first circulating conveying pipe 4. The outlet end of the water-cooled tower is connected to an adsorption tank 18. A zeolite layer 19 is provided inside the adsorption tank 18. The filter tank includes a tank body 20, an air inlet pipe 21 provided on the tank body 20, a microporous filter plate 22 provided inside the tank body 20 above the air inlet pipe 21, and an air outlet pipe 23 provided on the tank body 20 above the microporous filter plate 22. The air inlet pipe 21 is a Venturi tube. The water-cooled tower includes a tower body 24, a water washing unit installed inside the tower body 24, and a wire mesh coalescing net 25 installed inside the tower body 24 above the water washing unit. The number of water washing units is several, and each water washing unit includes a water supply pipe 26 installed on the tower body 24, a nozzle 27 installed on the water supply pipe 26 inside the tower body 24, and a packing layer 28 installed inside the tower body 24 below the nozzle 27.

[0020] A first online chromatograph 29 and a first gas flow sensor 30 are installed on the first circulation pipe 4 between the first regulating valve 5 and the first tail gas delivery pipe 6. A temperature sensor 31 and a second online chromatograph 32 are installed on the first circulation pipe 4 between the electric heater 8 and the air inlet pipe 2. A second gas flow sensor 33 and a first air filter 34 are sequentially installed on the first air delivery pipe 13 along the direction from near the air mixer to away from the air mixer. A second regulating valve 14 is located between the second gas flow sensor 33 and the first air filter 34. A third gas flow sensor 35 is installed on the first tail gas delivery pipe 6 between the third regulating valve 15 and the first air-cooled heat exchanger 16. The installation of a first online chromatograph 29 facilitates feedback of component parameters in the gas medium transported via the return air duct 3; the installation of a first gas flow sensor 30 facilitates feedback of flow parameters in the gas medium; the installation of a temperature sensor 31 facilitates feedback of temperature parameters; the installation of a second online chromatograph 32 facilitates feedback of component parameters in the gas medium transported to the inlet air duct 2; the installation of a second gas flow sensor 33 facilitates feedback of flow parameters in the gas medium transported via the first air delivery pipe 13 to the first circulation delivery pipe 4; and the installation of a third gas flow sensor 35 facilitates feedback of flow parameters in the gas medium transported via the first exhaust gas delivery pipe 6. This allows for timely feedback of the component and flow parameters of the return air transported via the return air duct 3 to the first circulation delivery pipe 4, and timely exhaust through the first exhaust gas delivery pipe 6 and continuous supply of fresh air through the first air delivery pipe 13, ensuring that the component parameters fed back by the second online chromatograph 32 remain within a preset range.

[0021] The adsorption tanks 18 are of several types, and each adsorption tank 18 is equipped with a zeolite layer 19. The inlet ends of the adsorption tanks 18 and the outlet ends of the water cooling tower are connected by first conveying branch pipes 36. A second tail gas conveying pipe 37 is provided on the outlet ends of the adsorption tanks 18. A third fan 38 and a third online chromatograph 39 are provided on the second tail gas conveying pipe 37. The outlet ends of the adsorption tanks 18 and the second tail gas conveying pipes 37 are connected by second conveying branch pipes 40. A first shut-off valve 41 is provided on the second conveying branch pipes 40 and the first conveying branch pipes 36.

[0022] Each of the adsorption tanks 18 has an inlet end of a third conveying branch pipe 42, and each of the adsorption tanks 18 has an outlet end of a fourth conveying branch pipe 43. A second shut-off valve 44 is provided on each of the fourth conveying branch pipes 43 and the third conveying branch pipes 42. A second circulation conveying pipe 45 is provided on the inlet end of the fourth conveying branch pipe 43 and the outlet end of the third conveying branch pipe 42. Along the direction from the third conveying branch pipe 42 to the fourth conveying branch pipe 43, the second circulation conveying pipe 45 is sequentially provided with a fourth regulating valve 46, the outlet end of a second air conveying pipe 47, the heat source channel of a second air-cooled heat exchanger 48, a fourth fan 49, a catalytic combustion furnace 50, and the inlet end of a third tail gas conveying pipe 51. A fifth regulating valve 52 is provided on the third tail gas conveying pipe 51. The catalytic combustion furnace 50 includes a furnace body and a silicon-carbon heating tube and a palladium catalyst layer disposed within the furnace body. The fourth gas flow sensor 53 and the fourth online chromatograph 54 are installed on the second circulation pipe 45 between the fourth regulating valve 46 and the first air supply pipe 13. The second air supply pipe 47 is equipped with a fifth gas flow sensor 55, a sixth regulating valve 56, a fifth fan 57 and a second air filter 58.

[0023] The usage instructions for this product are as follows: Figures 1 to 4 As shown, it includes the following steps:

[0024] S1. When the sandpaper to be dried is sent into the drying chamber 1, the first fan 7, the electric heater 8, the second fan 17, and the third fan 38 are turned on. Outside air is filtered by the first air filter 34 and then sent to the electric heater 8 through the first air delivery pipe 13 and the first circulation delivery pipe 4 to form a heated airflow. After the temperature parameter is fed back by the temperature sensor 31 and the component parameter is fed back by the second online chromatograph 32, it is sent to the drying chamber 1 through the air inlet pipe 2 to heat the sandpaper to be dried. The heated airflow carries the gaseous components volatilized from the sandpaper to be dried to form a return airflow and is sent to the first circulation delivery pipe 4 and divided into two parts. The first part of the return airflow is continuously sent to the first exhaust gas delivery pipe 6 to form an external exhaust flow. The second part of the return airflow is continuously sent to the housing 9. At the same time, the first air delivery pipe 13 continuously sends fresh air into the housing 9 through the air delivery bend pipe 10. The fresh air, along with the second part of the return airflow, is guided by the mixing cone 11 and mixed by the spiral blades 12 to form a heated airflow, which is then sent to the electric heater 8 for heating to form the first circulation.

[0025] S2. After entering the first exhaust gas conveying pipe 6, the exhaust gas is first conveyed to the heat source channel of the first air-cooled heat exchanger 16 for heat exchange with the atmosphere. When the exhaust gas passes through the heat source channel of the first air-cooled heat exchanger 16, it forms the first cooling of the exhaust gas. The liquefiable medium in the exhaust gas is liquefied to form a gas-liquid mixture containing liquid and gaseous media. The exhaust gas continues to move along the first exhaust gas conveying pipe 6 and is conveyed to the inlet pipe 21. Under the guidance of the external exhaust flow, the liquid medium in the external exhaust flow first impacts the inner wall of the tank 20 on the side facing the outlet end of the inlet pipe 21. The liquid medium accumulates on this part of the inner wall of the tank 20. The particulate impurities carried in the external exhaust flow are filtered into the tank 20 below the microporous filter plate 22 by the liquid medium accumulated on the inner wall of the tank 20 and the microporous filter plate 22. The gaseous components in the external exhaust flow are transported to the tower body 24 through the exhaust pipe 23.

[0026] S3. After the exhaust gas enters the tower body 24, it passes through the water washing unit. During this period, the water supply pipe 26 continuously receives cooling water and sprays cooling water onto the packing layer 28 through the nozzle 27. As the exhaust gas passes through the packing layer 28, the flow velocity meets the surface and the cooling water is continuously sprayed onto the packing layer 28 through the nozzle 27, forming a countercurrent heat exchange. At this time, the exhaust gas undergoes a second cooling, and the temperature of the exhaust gas further decreases. More liquefiable substances are liquefied, and the unvaporized but water-soluble parts of the exhaust gas are all merged into the cooling water received by the packing layer 28 to form a descending liquid flow. After the second cooling, the exhaust gas is transported to the adsorption tank 18 in the working state. After adsorption by the zeolite layer 19 in the adsorption tank 18, it is transported to the second tail gas delivery pipe 37. During this period, the component parameters are fed back by the third online chromatograph 39.

[0027] When the zeolite layer 19 of the adsorption tank 18 in working condition reaches the preset time, or when the component parameters reported by the third online chromatograph 39 are abnormal, the state of the adsorption tank 18 in working condition and the adsorption tank 18 in standby condition should be switched in a timely manner, specifically including the following steps:

[0028] Close the first shut-off valve 41 of the first delivery branch pipe 36 corresponding to the adsorption tank 18 in the working state and the first shut-off valve 41 of the second delivery branch pipe 40 corresponding to the adsorption tank 18 in the working state; open the first shut-off valve 41 of the first delivery branch pipe 36 corresponding to the adsorption tank 18 in the standby state and the first shut-off valve 41 of the second delivery branch pipe 40 corresponding to the adsorption tank 18 in the standby state. After completing the above operations, the state switching of the adsorption tank 18 in the working state and the adsorption tank 18 in the standby state is completed. The adsorption tank 18 originally in the working state is transformed into the adsorption tank 18 in the state of waiting to desorb, and the adsorption tank 18 originally in the standby state is transformed into the adsorption tank 18 in the working state.

[0029] The adsorption tank 18, which is in a state of waiting to be desorbed, needs to be regenerated before it can be put back into use. The specific regeneration process includes the following steps:

[0030] First, the fourth regulating valve 46, the sixth regulating valve 56, the fifth fan 57, and the fourth fan 49 are opened. Outside air is filtered by the second air filter 58 and then transported to the second circulation conveying pipe 45 through the second air conveying pipe 47. After being heated by the catalytic combustion furnace 50, it forms a desorption gas flow. Then, it enters the adsorption tank 18 from the outlet end of the adsorption tank 18 in the desorption state. After passing through the zeolite layer 19 of the adsorption tank 18, the substances adsorbed in the zeolite layer 19 are continuously desorbed and combined in the desorption gas flow. It is then transported to the catalytic combustion furnace 50 again through the inlet end of the adsorption tank 18 and the second circulation conveying pipe 45 for catalytic combustion. After catalytic combustion, a waste heat gas flow is formed. The waste heat gas flow is divided into two parts. The first part of the waste heat gas flow is continuously discharged through the third tail gas conveying pipe 51, and the second part of the waste heat gas flow is transported again to the outlet end of the adsorption tank 18 in the desorption state as a desorption gas flow to form a second circulation.

[0031] It should be noted that after the desorption gas flow is delivered from the inlet of the adsorption tank 18 in the desorption state to the second circulation delivery pipe 45, it needs to pass through the fourth gas flow sensor 53 to receive feedback on the flow rate parameters and the fourth online chromatograph 54 to receive feedback on the component parameters. Based on the oxygen content in the component parameters fed back by the fourth online chromatograph 54 and the flow rate parameters fed back by the fourth gas flow sensor 53, fresh air needs to be continuously delivered through the second air delivery pipe 47 to maintain the oxygen content in the gas flow entering the catalytic combustion furnace 50 within a suitable range. The gas flow after replenishing the air then enters the heat source channel of the second air-cooled heat exchanger 48 to exchange heat with the outside atmosphere. Although this method will increase the heat energy consumption, it can effectively reduce the operating temperature of the fourth fan 49 and reduce the maintenance frequency of the fourth fan 49. The gas discharged from the outlet of the heat source channel of the second air-cooled heat exchanger 48 enters the catalytic combustion furnace 50 for catalytic combustion to maintain the second circulation. When the component parameters reported by the fourth online chromatograph 54 are within the preset range, the second cycle can be stopped. At this time, the adsorption tank 18, which was originally in the state of waiting to be desorbed, is converted into the adsorption tank 18 in the standby state for use.

[0032] In this embodiment, the hot airflow circulating in the first circulating conveying pipe 4 connected to the drying chamber 1 is discharged through the first exhaust gas conveying pipe 6. The discharged hot air exchanges heat with the air through the heat source channel of the first air-cooled heat exchanger 16. A large amount of liquefiable medium is liquefied and enriched in the tank 20. Under the action of the microporous filter plate 22 and the liquid enriched in the tank 20, a small amount of sand particles carried by the discharged hot air are enriched in the tank 20 below the microporous filter plate 22. This reduces the content of components that can be re-formed into adhesive liquid when transported to the water cooling tower, thereby reducing the problem of increased flow resistance of the water cooling tower packing layer caused by sand particles adhering to the medium due to liquefaction of the medium, and reducing the maintenance frequency of the water cooling tower packing layer.

[0033] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A tail gas treatment device for drying sandpaper, characterized in that: The utility model provides a kind of drying room, the drying room is provided with air inlet pipe (2) and return air pipe (3), air inlet pipe (2) and return air pipe (3) are provided with first circulating conveying pipe (4), first circulating conveying pipe (4) is sequentially provided with first regulating valve (5), the import end of first tail gas conveying pipe (6), air mixer, first fan (7) and electric heater (8) along the direction of return air pipe (3) to air inlet pipe (2), the air mixer includes shell (9) and shell (9) inside sequentially arranged gas elbow (10), gas mixing cone (11) and spiral blade (12) along the direction of shell (9) import end to shell (9) export end, gas elbow (10) is provided with first air conveying pipe (13), first air conveying pipe (13) is provided with second regulating valve (14), first tail gas conveying pipe (6) is sequentially provided with third regulating valve (15), the heat source channel of first air-cooled heat exchanger (16), filter tank, second fan (17) and the import end of water cooling tower along the direction of being close to first circulating conveying pipe (4) to being away from first circulating conveying pipe (4), the outlet end of water cooling tower is communicated with adsorption tank (18), adsorption tank (18) is provided with zeolite layer (19) in, the filter tank includes tank body (20), the air inlet pipe (21) provided on tank body (20), the micropore filter plate (22) provided in tank body (20) above air inlet pipe (21) and the air outlet pipe (23) provided on tank body (20) above micropore filter plate (22), air inlet pipe (21) uses venturi.

2. The abrasive cloth drying exhaust treatment device of claim 1, wherein: The water cooling tower includes tower body (24), the water washing unit provided in tower body (24) and the wire mesh coalescing screen (25) provided in tower body (24) above the water washing unit, the number of the water washing unit uses several, and each water washing unit includes water delivery pipe (26) provided on tower body (24), the spray head (27) provided on water delivery pipe (26) inside tower body (24) and the filler layer (28) provided in tower body (24) below spray head (27).

3. The abrasive cloth drying exhaust treatment device of claim 1, wherein: First regulating valve (5) and first tail gas conveying pipe (6) are provided with first on-line chromatograph (29) and first gas flow sensor (30) on first circulating conveying pipe (4) between, temperature sensor (31) and second on-line chromatograph (32) are provided on first circulating conveying pipe (4) between electric heater (8) and air inlet pipe (2), second gas flow sensor (33) and first air filter (34) are sequentially provided in first air conveying pipe (13) along the direction of being close to the air mixer to being away from the air mixer, second regulating valve (14) is between second gas flow sensor (33) and first air filter (34), third gas flow sensor (35) is provided on first tail gas conveying pipe (6) between third regulating valve (15) and first air-cooled heat exchanger (16).

4. The abrasive cloth drying exhaust treatment device of claim 1, wherein: The number of the adsorption tanks (18) is several, and a zeolite layer (19) is installed in each adsorption tank (18); the inlet end of each of the several adsorption tanks (18) is connected to the outlet end of the water cooling tower through a first conveying branch pipe (36) respectively; a second tail gas conveying pipe (37) is arranged at the outlet end of each of the several adsorption tanks (18); a third fan (38) and a third online chromatograph (39) are arranged on the second tail gas conveying pipe (37); the outlet end of each of the several adsorption tanks (18) is connected to the second tail gas conveying pipe (37) through a second conveying branch pipe (40) respectively; and the first conveying branch pipe (36) and the second conveying branch pipe (40) are respectively provided with a first stop valve (41).

5. The abrasive cloth drying exhaust treatment device of claim 1, wherein: The inlet end of each of the several adsorption tanks (18) is provided with the inlet end of a third conveying branch pipe (42); the outlet end of each of the several adsorption tanks (18) is provided with the outlet end of a fourth conveying branch pipe (43); the third conveying branch pipe (42) and the fourth conveying branch pipe (43) are respectively provided with a second stop valve (44); the inlet end of the fourth conveying branch pipe (43) and the outlet end of the third conveying branch pipe (42) are provided with a second circulating conveying pipe (45); the second circulating conveying pipe (45) is sequentially provided with a fourth adjusting valve (46), the outlet end of a second air conveying pipe (47), a heat source channel of a second air-cooled heat exchanger (48), a fourth fan (49), a catalytic combustion furnace (50) and the inlet end of a third tail gas conveying pipe (51) along the direction from the third conveying branch pipe (42) to the fourth conveying branch pipe (43); the third tail gas conveying pipe (51) is provided with a fifth adjusting valve (52); and the catalytic combustion furnace (50) comprises a furnace body and a silicon-carbon heating pipe and a palladium catalyst layer arranged in the furnace body.

6. The abrasive cloth drying exhaust treatment device of claim 5, wherein: The fourth adjusting valve (46) and the second circulating conveying pipe (45) between the first air conveying pipe (13) are provided with a fourth gas flow sensor (53) and a fourth online chromatograph (54); and the second air conveying pipe (47) is provided with a fifth gas flow sensor (55), a sixth adjusting valve (56), a fifth fan (57) and a second air filter (58).

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