Aerogel production line tail gas recovery system and use method

Abstract

The invention provides an aerogel production line tail gas recovery system and a using method, and the aerogel production line tail gas recovery system comprises a sol tail gas recovery system, a gluing gel line tail gas recovery system, a soaking modification tail gas recovery system and a tail gas recovery water scrubber. The output ends of the sol tail gas recovery system, the gluing and gel line tail gas recovery system and the soaking modification tail gas recovery system are connected with the input end of the tail gas recovery water scrubber; tail gas of the sol tail gas recovery system, the gluing and gel line tail gas recovery system and the soaking modification tail gas recovery system enters the tail gas recovery water washing tower through a tail gas recovery pipeline to be washed. According to the aerogel production line tail gas recovery system and the use method, various alcohol and ammonia gases generated in the gel production process can be effectively collected, the generated tail gas is treated through the tail gas recovery water washing tower, and the situation that the tail gas escapes in a production operation space, and potential safety hazards are caused is effectively avoided; and reusable production raw materials can be recycled, so that the production cost of the gel is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the field of aerogel production equipment, and in particular relates to an aerogel production line and a tail gas recovery system and a use method. Background Art

[0002] In the aerogel preparation and production process, the entire process includes multiple processes such as sol, gel, modification, drying, solvent recovery, etc., and the aerogel pretreatment process, such as the preparation of sol, gel, modification and other processes, is accompanied by chemical reactions such as gel condensation. Except for the gel process, all of them are completed in a normal pressure reactor during the production process. In traditional conventional production, alcohol substances such as methanol and ethanol, and flammable and explosive gases such as ammonia are volatilized and directly discharged to a conventional waste gas treatment device through a venting pipe, and then enter the sewage treatment station after being washed with water. However, since the reactor is a normal pressure container, a large amount of volatile gases in the reaction process are volatilized and directly enter the waste gas treatment device. In addition, the volatilized gases from the reaction of the gel coating line during the gel process are not effectively collected, and alcohol substances and ammonia cannot be effectively recovered or collected and discharged. Not only will it cause a large amount of alcohol substances in the production process Waste, leading to an increase in the direct cost of production, alcohol and ammonia gases are both flammable and explosive media, and spreading them in the working space will greatly increase the safety hazards of the production environment. Although the working space is equipped with certain safety ventilation facilities and concentration detection measures, gas escape may still occur, which greatly reduces the safety of the entire operation process and poses certain safety hazards to the safety and occupational health of the production workshop. Summary of the invention

[0003] To solve the above problems, the present invention provides an aerogel production line tail gas recovery system and a method of use, which utilizes a tail gas recovery water washing tower to wash the tail gas collected by the sol tail gas recovery system, the coating gel line tail gas recovery system, and the immersion modification tail gas recovery system, thereby effectively collecting various volatile gases generated during the production process.

[0004] An aerogel production line tail gas recovery system comprises a sol tail gas recovery system, a gel coating line tail gas recovery system, an immersion modification tail gas recovery system and a tail gas recovery water washing tower, wherein the output ends of the sol tail gas recovery system, the gel coating line tail gas recovery system and the immersion modification tail gas recovery system are connected to the input end of the tail gas recovery water washing tower. The tail gas recovery water washing tower collects tail gas discharged from the sol tail gas recovery system, the gel coating line tail gas recovery system and the immersion modification tail gas recovery system, and washes the tail gas with water.

[0005] The tail gas recovery water washing tower is the main equipment for tail gas treatment, including water washing tower 1, water washing tower 2, circulating pump 1, circulating pump 2, circulating pipeline 1, circulating pipeline 2, overflow pipeline, tail gas recovery pipeline, water supply pipeline, exhaust gas pipeline and sewage pipeline.

[0006] Among them, circulating pump 1 is connected to circulating pipeline 1, circulating pump 2 is connected to circulating pipeline 2, the input end of circulating pipeline 1 is connected to the bottom of water washing tower 1, the output end is connected to the middle of water washing tower 1, the input end of circulating pipeline 2 is connected to the bottom of water washing tower 2, and the output end is connected to the middle of water washing tower 2, so as to form a water flow circulation in water washing tower 1 and water washing tower 2. The exhaust gas pipeline is used to transport the other in water washing tower 2 into water washing tower 1, and the input end of the exhaust gas pipe is connected to the top of water washing tower 2, and the output end is connected to the middle of water washing tower 1. The input end of the overflow pipeline is connected to the middle section of circulating pipeline 1, and the output end is connected to the top of water washing tower 2, so that the water flow exceeding the water level of water washing tower 1 can flow back into water washing tower 2. The sewage pipeline is connected to the middle section of circulating pipeline 2 for discharging sewage. The water supply pipeline is connected to the top of water washing tower 1, and the water in water washing tower 1 can be supplemented through the water supply pipeline. The tail gas recovery pipeline serves as the input end of the tail gas recovery water washing tower, is connected in the middle of the second water washing tower, and is used to pass the tail gas into the second water washing tower.

[0007] The sol tail gas recovery system is used to recover the tail gas generated in the sol reaction process, including a sol reactor, a sol circulation pump, a methanol condenser, a nitrogen pipeline 1, a collection pipeline, a condensation recovery pipeline, a water washing pipeline 1, a sol internal circulation pipeline and a de-gumming line pipeline.

[0008] Nitrogen pipeline 1 is connected to the top of the sol reactor, and nitrogen is introduced through the nitrogen pipeline to control the pressure in the sol reactor. The sol circulation pump is connected to the sol internal circulation pipeline, and the input end of the sol internal circulation pipeline is connected to the bottom of the sol reactor and the output end is connected to the top of the sol reactor. The reaction raw materials are continuously circulated and reacted through the sol circulation pump and the sol internal circulation pipe. The input end of the collection pipeline is connected to the top of the sol reactor and the output end is connected to the methanol condenser. The gas generated during the reaction is collected into the methanol condenser through the collection pipeline. The input end of the condensation recovery pipeline is connected to the methanol condenser and the output end is connected to the top of the sol reactor. The methanol condensed by the methanol condenser is returned to the sol reactor through the condensation recovery pipeline. The water washing pipeline 1 is used to discharge the gas that cannot be condensed in the methanol condenser. The input end of the water washing pipeline 1 is connected to the methanol condenser and the output end is connected to the tail gas recovery pipeline. The de-gumming line pipeline is connected to the middle of the sol internal circulation pipeline and is used to transport the sol after the reaction to the next process.

[0009] The gel tail gas recovery system of the glue coating line is used to recover the tail gas generated in the glue coating line, including the glue coating production line, the discharge fan, the gel line fan, the receiving fan and the water washing pipeline 2.

[0010] The glue coating production line consists of three parts: automatic discharge area, glue coating reaction area, and automatic collection area. In order to prevent gas from escaping, the glue coating production line is set as a closed production line. The discharge fan is connected to the top of the automatic discharge area, and the output end is connected to the water washing pipeline 2. The gel line fan is connected to the top of the glue coating reaction area, and the output end is connected to the water washing pipeline 2. The collection fan is connected to the top of the automatic collection area, and the output end is connected to the water washing pipeline 2. The output end of the water washing pipeline 2 is connected to the exhaust gas recovery pipeline, and the exhaust gas from the automatic discharge area, glue coating reaction area, and automatic collection area is pumped into the water washing pipeline 2 through the discharge fan, gel line fan, and collection fan, and then sent to the exhaust gas recovery water washing tower through the water washing pipeline 2.

[0011] The immersion modification tail gas recovery system is used to recover the tail gas in the dissolution immersion modification process, including the immersion modification kettle, the methanol recovery intermediate tank, the methanol cooler, the immersion circulation pipeline, the immersion circulation pump, the methanol recovery pipeline, the methanol volatilization pipeline, the nitrogen pipeline 2 and the water washing pipeline 3.

[0012] Nitrogen pipeline 2 is connected to the upper end of the soaking and modification kettle, and nitrogen is introduced through nitrogen pipeline 2 to adjust the pressure in the soaking and modification kettle. The soaking circulation pump is arranged on the soaking circulation pipeline, and the input end of the soaking circulation pipeline is connected to the bottom of the soaking and modification kettle, and the output end is connected to the upper end of the soaking and modification kettle. The soaking liquid is continuously circulated in the soaking and modification kettle by using the soaking circulation pump and the soaking circulation pipeline. The input end of the methanol volatilization pipeline is connected to the top of the soaking and modification kettle, and the output end is connected to the methanol cooler. The volatilized gas in the soaking and modification kettle enters the methanol cooler through the methanol volatilization pipeline for cooling. The input end of the methanol recovery intermediate tank is connected to the methanol cooler through the methanol recovery pipeline, and the cooled methanol enters the methanol recovery intermediate tank through the methanol recovery pipeline for storage. The output end of the methanol recovery intermediate tank is connected to the soaking circulation pipeline, so that the methanol in the methanol recovery intermediate tank can re-enter the soaking and modification kettle for recycling. The input end of the water washing pipeline three is connected to the methanol cooler, and the output end is connected to the tail gas recovery pipeline. The gas that cannot be cooled in the methanol cooler enters the tail gas recovery water washing tower through the water washing pipeline three.

[0013] In order to increase the exhaust gas washing efficiency in water washing tower 1 and water washing tower 2, a multi-layer stainless steel packing structure is arranged inside water washing tower 1 and water washing tower 2 to increase the contact area between water flow and exhaust gas, so that the exhaust gas can be fully dissolved in water.

[0014] The method for using the tail gas recovery system of the aerogel production line provided by the present invention is to allow the tail gas of the sol tail gas recovery system, the coating gel line tail gas recovery system and the immersion modification tail gas recovery system to enter the tail gas recovery water washing tower through the tail gas recovery pipeline, and the tail gas is washed with water by the tail gas recovery water washing tower.

[0015] After the tail gas enters the water washing tower 2 through the tail gas recovery pipe, the water at the bottom of the water washing tower 2 is continuously circulated in the water washing tower 2 under the action of the circulation pump 2 and the circulation pipeline 2, and is sprayed downward from the upper end of the water washing tower 2. During the spraying process, the tail gas entering the water washing tower 2 is flushed and washed. When there is tail gas in the water washing tower 2 that cannot be fully washed and dissolved, the remaining tail gas enters the water washing tower 1 through the exhaust gas pipeline, and the water at the bottom of the water washing tower 1 is continuously circulated in the water washing tower 1 under the action of the circulation pump 1 and the circulation pipeline 1, and is sprayed downward from the upper end of the water washing tower 1. During the spraying process, the tail gas entering the water washing tower 1 is flushed and washed. When the liquid level in the water washing tower 1 exceeds the set value, the water in the water washing tower 1 will enter the water washing tower 2 through the overflow pipeline, and the tail gas will be washed while replenishing the water level of the water washing tower 2. Continuously repeating the above steps can complete the tail gas washing process. When the water in the water washing tower 2 reaches the sewage discharge standard line after testing, the sewage can be discharged to the tail gas recovery water washing tower 2 through the sewage pipe; when the water level in the water washing tower 1 and the water washing tower 2 is insufficient, water can be added to the water washing tower 1 through the water supply pipe.

[0016] The tail gas recovery principle of the sol tail gas recovery system is that during the aerosol reaction process, the aerosol reaction raw materials are continuously circulated and reacted in the sol reactor through the sol internal circulation pipeline and the sol circulation pump. Nitrogen is injected into the sol reactor through the nitrogen pipeline to control the working pressure of the reaction environment and ensure that the working pressure in the sol reactor is kept within the appropriate range. The heat generated in the reaction process generates a large amount of volatile gas. The generated gas enters the methanol condenser through the collection pipeline, and is condensed and reduced to liquid by the methanol condenser. The liquid methanol returns to the sol reactor through the condensation recovery pipeline for reaction, completing the recovery and utilization of methanol. During the methanol condensation process, the others that cannot be condensed enter the tail gas recovery water washing tower through the water washing pipeline for water washing. The qualified sol generated by the reaction in the sol reactor is transported to the glue coating production line through the sol removal line pipeline for the next production process.

[0017] In the gel tail gas recovery system of the glue coating line, since the glue coating production line is a closed production line, the tail gas from the automatic discharge area, glue coating reaction area and automatic receiving area is basically inside the glue coating production line. The automatic discharge area, glue coating reaction area and automatic receiving area are respectively exhausted and pressurized for recovery through the discharge fan, gel line fan and receiving fan, and the recovered tail gas can enter the tail gas recovery water washing tower through the water washing pipeline 2.

[0018] The tail gas recovery principle of the soaking modification tail gas recovery system is that during the soaking modification process, nitrogen is injected into the soaking modification kettle through nitrogen pipeline 2 to maintain the internal air pressure, and the soaking liquid in the soaking modification kettle circulates in the soaking modification kettle through the soaking circulation pipeline and the soaking circulation pump, and the product performance is improved by flushing and modifying the wet gel. The methanol volatilized during the soaking modification process enters the methanol cooler through the methanol volatilization pipeline, and the volatilized methanol gas is restored to liquid after cooling. The liquid methanol enters the methanol recovery intermediate tank through the methanol recovery pipeline, waiting for the next soaking modification. In the methanol cooler, other gases that cannot be condensed enter the tail gas recovery water washing tower through the water washing pipeline 3.

[0019] The aerogel production line tail gas recovery system and use method provided by the present invention can effectively collect various alcohol and ammonia gases generated in the gel production process, treat the generated tail gas by water washing, effectively avoid various safety hazards caused by tail gas escape on the production line, and can recover reusable production raw materials, greatly reducing the gel production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below with reference to the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the structure of the sol tail gas recovery system; Figure 2 This is a schematic diagram of the structure of the tail gas recovery system of the glue coating gel line; Figure 3 This is a schematic diagram of the structure of the immersion modified tail gas recovery system; Figure 4 This is a schematic diagram of the tail gas recovery water washing tower structure; As shown in the figure: 1-sol tail gas recovery system; 2-coating gel line tail gas recovery system; 3-immersion modification tail gas recovery system; 4-tail gas recovery water washing tower; 11-sol reactor; 12-sol circulation pump; 13-methanol condenser; 14-nitrogen pipeline 1; 15-collection pipeline; 16-condensation recovery pipeline; 17-water washing pipeline 1; 18-sol internal circulation pipeline; 19-de-coating line pipeline; 21-coating production line; 22-discharging fan; 23-gel line fan; 24-collecting fan; 25-water washing pipeline 2; 26-automatic discharging area; 27-coating Glue reaction area; 28-automatic material collection area; 31-immersion modification kettle; 32-methanol recovery intermediate tank; 33-methanol cooler; 34-immersion circulation pipeline; 35-immersion circulation pump; 36-methanol recovery pipeline; 37-methanol volatilization pipeline; 38-nitrogen pipeline 2; 39-water washing pipeline 3; 41-water washing tower 1; 42-water washing tower 2; 43-circulation pump 1; 44-circulation pump 2; 45-circulation pipeline 1; 46-circulation pipeline 2; 47-overflow pipeline; 48-tail gas recovery pipeline; 49-water supply pipeline; 410-exhaust gas pipeline; 411-sewage pipeline. DETAILED DESCRIPTION

[0022] To further illustrate the concept of the present invention, the present invention will be further described in detail by specific examples below. The following examples are only for illustrative purposes to illustrate and explain the present invention, and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the contents of the present invention are included in the scope of protection intended by the present invention.

[0023] An aerogel production line tail gas recovery system comprises a sol tail gas recovery system 1, a coating gel line tail gas recovery system 2, an immersion modification tail gas recovery system 3 and a tail gas recovery water washing tower 4.

[0024] The tail gas recovery water washing tower 4 is mainly composed of a water washing tower 1 41 and a water washing tower 2 42. Figure 4As shown, a circulation pipeline 1 45 is installed at the lower end of the water washing tower 1 41, and a circulation pump 1 43 is installed on the circulation pipeline 1 45. The inlet of the circulation pipeline 1 45 is set at the bottom of the water washing tower 1 41, and the outlet is set at the middle of the water washing tower 1 41. A multi-layer stainless steel packing structure is provided inside the water washing tower 1 41 and the water washing tower 2 42. A circulation pipeline 2 46 is installed at the lower end of the water washing tower 2 42, and a circulation pump 2 44 is installed on the circulation pipeline 2 46. The inlet of the circulation pipeline 2 46 is set at the bottom of the water washing tower 1 41, and the outlet is set at the middle of the water washing tower 2 42. An exhaust gas pipeline 410 is installed from the top of the water washing tower 2 42, and the outlet end of the exhaust gas pipeline 410 is connected to the middle of the water washing tower 1 41. An overflow pipeline 47 is installed from the middle section of the circulation pipeline 1 45, and the outlet of the overflow pipeline 47 is set in the middle of the water washing tower 2 42. A sewage pipeline 411 is installed in the middle of the circulation pipeline 2 46, and a water supply pipeline 49 is installed on the top of the water washing tower 1 41. A tail gas recovery pipeline 48 is installed in the middle of the water washing tower 2 42.

[0025] The tail gas from the sol tail gas recovery system 1, the coating gel line tail gas recovery system 2, and the soaking modification tail gas recovery system 3 enters the water washing tower 2 42 through the tail gas recovery pipeline 48. The main body of the sol tail gas recovery system 1 is the sol reactor 11 and the methanol condenser 13. Figure 1 As shown, the nitrogen pipeline 14 is connected to the top of the sol reactor 11, the sol internal circulation pipeline 18 is installed at the lower end of the sol reactor 11, and the sol circulation pump 12 is installed in the middle of the sol internal circulation pipeline 18, so that the inlet of the sol internal circulation pipeline 18 is located at the bottom of the sol reactor 11 and the outlet is located at the top of the sol reactor 11. The methanol condenser 13 and the sol reactor 11 are connected by the condensation recovery pipeline 16, and then the sol reactor 11 and the methanol condenser 13 are connected by the collection pipeline 15. The condensation recovery pipeline 16 is connected to the top of the sol reactor 11, and the collection pipeline 15 is connected to the bottom of the sol reactor 11. The two ends of the water washing pipeline 17 are respectively connected to the methanol condenser 13 and the tail gas recovery pipeline 48, and finally the de-gumming line pipeline 19 is connected to the middle of the sol internal circulation pipeline 18.

[0026] During operation, the internal working pressure of the sol reactor 11 is set to 0.2MPa. The raw materials for the aerogel sol reaction used for production are transported and stored in the sol reactor 11 through the corresponding pipelines. The pressure of the nitrogen pipeline 14 is set to 0.1-0.15MPa to ensure that the sol reactor 11 is in a positive pressure working environment during the reaction. Through continuous internal stirring and the circulation of the sol circulation pump 12, a chemical polycondensation reaction occurs in the sol reactor 11. The heat released during the reaction causes the methanol and other gases in the raw materials to volatilize by heat. When the volatile gas rises to the top of the sol reactor 11, it enters the methanol condenser 13 through the collection pipeline 15. The methanol condenser 13 adopts a shell and tube heat exchanger. The shell side is passed through cooling water at 30-35°C to cool the various gases entering. Through the cold and heat exchange of the medium, the methanol is condensed and reduced to liquid in the methanol condenser 13. The liquid methanol flows back into the sol reactor 11 through the condensation recovery pipeline 16 for reuse. The non-condensable gas enters the tail gas recovery water washing tower 4 through the water washing pipeline 17.

[0027] The main body of the gel tail gas recovery system of the glue coating line is the glue coating production line 21, such as Figure 2 As shown, the glue coating production line 21 includes other sol production equipment, and the glue coating production line 21 is divided into three areas: automatic discharge area 26, glue coating reaction area 27, and automatic collection area 28. The glue coating production line 21 is closed to form a closed production line. A discharge fan 22 is installed on the top of the automatic discharge area 26, a gel line fan 23 is installed on the top of the glue coating reaction area 27, and a collection fan 24 is installed on the top of the automatic collection area 28. Then, the discharge fan 22, the gel line fan 23 and the collection fan 24 are connected to the water washing pipeline 25, and the output end of the water washing pipeline 25 is connected to the exhaust gas recovery pipeline 48.

[0028] During operation, the qualified sol from the sol reaction device is fully mixed with the catalyst and then evenly sprayed on the carrier placed in the glue coating reaction zone 27 through the glue coating line spraying device. Various gases are generated in this process and are controlled to the maximum extent in the glue coating production line 21. During the rising process of the gas, it is sucked into the water washing pipeline 25 through the exhaust and pressure boosting of the discharge fan 22, the gel line fan 23 and the receiving fan 24, and then enters the tail gas recovery water washing tower 4 through the water washing pipeline 25. In order to ensure zero gas leakage during the operation process, the discharge fan 22, the gel line fan 23 and the receiving fan 24 use Roots blowers to ensure the intrinsic safety of the equipment in the exhaust gas recovery process.

[0029] The main body of the soaking and modification tail gas recovery system 3 includes a soaking and modification kettle 31, a methanol recovery intermediate tank 32 and a methanol cooler 33. Figure 3As shown. A nitrogen pipeline 2 38 is installed at the upper end of the soaking modification kettle 31, a soaking circulation pipeline 34 is installed at the bottom end of the soaking modification kettle 31, and a soaking circulation pump 35 is installed in the middle of the soaking circulation pipeline 34, so that the input end of the soaking circulation pipeline 34 is located at the bottom of the soaking modification kettle 31, and the output end is located at the upper end of the soaking modification kettle 31. The soaking modification kettle 31 and the methanol cooler 33 are connected by a methanol volatilization pipeline 37, and the methanol recovery intermediate tank 32 and the methanol cooler 33 are connected by a methanol recovery pipeline 36, and then the output end of the methanol recovery intermediate tank 32 is connected to the soaking circulation pipeline 34. The water washing pipeline 39 is connected to the methanol cooler 33 and the tail gas recovery pipeline 48 respectively.

[0030] During operation, the wet gel is placed in the soaking modification kettle 31, and the methanol soaking liquid in the soaking modification kettle 31 is continuously self-circulated through the soaking circulation pipeline 34, and the interior and surface of the wet gel are scour modified in an all-round manner. In this process, various gases volatilized by heat enter the methanol cooler 33 through the methanol volatilization pipeline 37. The methanol cooler 33 adopts a shell and tube heat exchanger, and 7-12°C chilled water is introduced into the shell side to cool the volatile gas entering. Through the heat exchange of the two media, the cooled methanol is reduced to liquid, and enters the methanol recovery intermediate tank 32 for storage through the methanol recovery pipeline 36, waiting for the next batch to be used. The gas that cannot be cooled into a liquid state enters the tail gas recovery water washing tower 4 through the water washing pipeline three 39. The soaking modification kettle 31 is in a slightly positive pressure state throughout the production process, and the nitrogen pressure is controlled to be about 0.05-0.1MPa.

[0031] The tail gas recovery system of the aerogel production line provided by the present invention also includes various instruments, control valves and other equipment for automatically controlling the tail gas recovery work throughout the process and controlling the switches of various pipelines. Since the arrangement of the instruments and valve bodies belongs to conventional technical means in the field, they are not described in detail in the specification and drawings.

[0032] There are many methods and approaches to implement the technical solutions of the present invention, and the above are only preferred implementations provided by way of example. Those skilled in the art may think of many changes, modifications and substitutions without departing from the present invention. It should be understood that various alternatives to the implementations of the present invention described herein may be adopted in the practice of the present invention. The attached claims are intended to limit the scope of the present invention and therefore cover methods within the scope of these claims and their equivalents. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

Claims

1. An aerogel production line tail gas recovery system, characterized by: It comprises a sol tail gas recovery system (1), a coating gel line tail gas recovery system (2), an immersion modification tail gas recovery system (3) and a tail gas recovery water washing tower (4), wherein the output ends of the sol tail gas recovery system (1), the coating gel line tail gas recovery system (2) and the immersion modification tail gas recovery system (3) are respectively connected to the input end of the tail gas recovery water washing tower (4); The tail gas recovery water washing tower (4) comprises a water washing tower 1 (41), a water washing tower 2 (42), a circulating pump 1 (43), a circulating pump 2 (44), a circulating pipeline 1 (45), a circulating pipeline 2 (46), an overflow pipeline (47), a tail gas recovery pipeline (48), a water supply pipeline (49), an exhaust gas pipeline (410) and a sewage pipeline (411); The circulation pump 1 (43) is connected to the circulation pipeline 1 (45), the circulation pump 2 (44) is connected to the circulation pipeline 2 (46), the input end of the circulation pipeline 1 (45) is connected to the bottom of the water washing tower 1 (41), the output end of the circulation pipeline 1 (45) is connected to the middle of the water washing tower 1 (41), the input end of the circulation pipeline 2 (46) is connected to the bottom of the water washing tower 2 (42), and the output end of the circulation pipeline 2 (46) is connected to the middle of the water washing tower 2 (42); the input end of the exhaust gas pipeline (410) is connected to the top of the water washing tower 2 (42), and the exhaust gas pipeline (411) is connected to the bottom of the water washing tower 2 (42). The output end of the gas pipeline (410) is connected to the middle of the first water washing tower (41); the input end of the overflow pipeline (47) is connected to the middle section of the first circulation pipeline (45), and the output end of the overflow pipeline (47) is connected to the top of the second water washing tower (42); the sewage pipeline (411) is connected to the middle section of the second circulation pipeline (46), and the water supply pipeline (49) is connected to the top of the first water washing tower (41); the tail gas recovery pipeline (48) serves as the input end of the tail gas recovery water washing tower (4), and the tail gas recovery pipeline (48) is connected to the middle of the second water washing tower (42).

2. The tail gas recovery system for an aerogel production line according to claim 1, characterized in that: The sol tail gas recovery system (1) comprises a sol reaction kettle (11), a sol circulation pump (12), a methanol condenser (13), a nitrogen pipeline (14), a collection pipeline (15), a condensation recovery pipeline (16), a water washing pipeline (17), a sol internal circulation pipeline (18) and a de-gumming line pipeline (19); The nitrogen pipeline (14) is connected to the top of the sol reactor (11), and the sol circulation pump (12) is connected to the sol internal circulation pipeline (18); the input end of the sol internal circulation pipeline (18) is connected to the bottom of the sol reactor (11), and the output end of the sol internal circulation pipeline (18) is connected to the top of the sol reactor (11); the input end of the condensation recovery pipeline (16) is connected to the methanol condenser (13), and the output end of the condensation recovery pipeline (16) is connected to the methanol condenser (13). The outlet end is connected to the top of the sol reactor (11); the input end of the collecting pipeline (15) is connected to the top of the sol reactor (11), and the output end of the collecting pipeline (15) is connected to the methanol condenser (13); the input end of the water washing pipeline (17) is connected to the methanol condenser (13), and the output end of the water washing pipeline (17) is connected to the tail gas recovery pipeline (48); the de-gumming line pipeline (19) is connected to the middle of the sol internal circulation pipeline (18).

3. The tail gas recovery system for an aerogel production line according to claim 2, characterized in that: The tail gas recovery system (2) of the glue coating gel line comprises a glue coating production line (21), a discharge fan (22), a gel line fan (23), a collection fan (24) and a second water washing pipeline (25); The glue coating production line (21) comprises three parts: an automatic material discharge area (26), a glue coating reaction area (27), and an automatic material collection area (28). The glue coating production line (21) is a closed production line; a material discharge fan (22) is connected to the top of the automatic material discharge area (26), and the output end of the material discharge fan (22) is connected to the second water washing pipeline (25); a gel line fan (23) is connected to the top of the glue coating reaction area (27), and the output end of the gel line fan (23) is connected to the second water washing pipeline (25); a material collection fan (24) is connected to the top of the automatic material collection area (28), and the output end of the material collection fan (24) is connected to the second water washing pipeline (25); the output end of the second water washing pipeline (25) is connected to the exhaust gas recovery pipeline (48).

4. The tail gas recovery system for an aerogel production line according to claim 3, characterized in that: The soaking and modification tail gas recovery system (3) comprises a soaking and modification kettle (31), a methanol recovery intermediate tank (32), a methanol cooler (33), a soaking circulation pipeline (34), a soaking circulation pump (35), a methanol recovery pipeline (36), a methanol volatilization pipeline (37), a second nitrogen pipeline (38) and a third water washing pipeline (39); The second nitrogen pipeline (38) is connected to the upper end of the soaking and modification kettle (31); the soaking circulation pump (35) is arranged on the soaking circulation pipeline (34); the input end of the soaking circulation pipeline (34) is connected to the bottom of the soaking and modification kettle (31); and the output end of the soaking circulation pipeline (34) is connected to the upper end of the soaking and modification kettle (31); the input end of the methanol volatilization pipeline (37) is connected to the top of the soaking and modification kettle (31); and the output end of the methanol volatilization pipeline (37) is connected to the methanol cooler (33); the input end of the methanol recovery intermediate tank (32) is connected to the methanol cooler (33) through the methanol recovery pipeline (36); and the output end of the methanol recovery intermediate tank (32) is connected to the soaking circulation pipeline (34); the input end of the water washing pipeline (39) is connected to the methanol cooler (33); and the output end of the water washing pipeline (39) is connected to the tail gas recovery pipeline (48).

5. The tail gas recovery system for an aerogel production line according to claim 4, characterized in that: The water washing tower 1 (41) and the water washing tower 2 (42) are provided with a multi-layer stainless steel packing structure.

6. A method for using the tail gas recovery system of the aerogel production line according to claim 1, characterized in that: The tail gas from the sol tail gas recovery system (1), the coating gel line tail gas recovery system (2) and the soaking modification tail gas recovery system (3) enters the tail gas recovery water washing tower (4) through the tail gas recovery pipeline (48); The tail gas enters the water washing tower 2 (42) through the tail gas recovery pipe. The bottom of the water washing tower 2 (42) is filled with water. The water is continuously circulated under the action of the circulation pump 2 (44) and the circulation pipeline 2 (46). It is sprayed downward from the upper end of the water washing tower 2 (42). During the spraying process, the tail gas entering the water washing tower 2 (42) is flushed and washed. The tail gas that is not fully washed and dissolved in the water washing tower 2 (42) enters the water washing tower 1 (41) through the exhaust gas pipeline (410). The bottom of the water washing tower 1 (41) is filled with water. The water is continuously circulated under the action of the circulation pump 1 (43) and the circulation pipeline 1 (45). It is sprayed downward from the upper end of the water washing tower 1 (41). During the spraying process, the tail gas entering the water washing tower (41) is flushed and washed; when the liquid level in the water washing tower (41) exceeds the set value, the water in the water washing tower (41) enters the water washing tower (42) through the overflow pipe (47); the above steps are continuously repeated during the water washing process; when the water levels in the water washing tower (41) and the water washing tower (42) are insufficient, water is added to the water washing tower (41) through the water supply pipe (49); when the water reaches the sewage discharge standard line, the tail gas is discharged through the sewage pipe (411) to the water washing tower (4) for recovery; when the water level is insufficient, water is added to the water washing tower (41) through the water supply pipe (49).

7. The method for using the tail gas recovery system of the aerogel production line according to claim 6, characterized in that: The aerosol reaction raw materials in the sol tail gas recovery system (1) are continuously circulated and reacted in the sol reactor (11) through the sol internal circulation pipeline (18) and the sol circulation pump (12); nitrogen is injected into the sol reactor (11) through the nitrogen pipeline (14) to control the working pressure of the reaction environment; qualified sol is transported to the coating production line (21) through the de-coating line pipeline (19); the gas in the sol reactor (11) enters the methanol condenser (13) through the collection pipeline (15); the condensed methanol returns to the sol reactor (11) through the condensation recovery pipeline (16); the gas that cannot be condensed enters the tail gas recovery water washing tower (4) through the water washing pipeline (17).

8. The method for using the tail gas recovery system of the aerogel production line according to claim 7, characterized in that: In the gel coating line gel tail gas recovery system (2), tail gas from the automatic discharge area (26), the gel coating reaction area (27) and the automatic collection area (28) are respectively recovered by exhaust and pressurization through the discharge fan (22), the gel line fan (23) and the collection fan (24), and the recovered tail gas enters the tail gas recovery water washing tower (4) through the water washing pipeline 2 (25).

9. The method for using the tail gas recovery system of the aerogel production line according to claim 8, characterized in that: In the soaking and modification tail gas recovery system (3), nitrogen is injected into the soaking and modification kettle (31) through the nitrogen pipeline 2 (38); the soaking liquid circulates in the soaking and modification kettle (31) through the soaking circulation pipeline (24) and the soaking circulation pump (35); the volatilized methanol enters the methanol cooler (33) through the methanol volatilization pipeline (37); the volatilized methanol gas, after being cooled, enters the methanol recovery intermediate tank (32) through the methanol recovery pipeline (36) for standby; the gas that cannot be condensed enters the tail gas recovery water washing tower (4) through the water washing pipeline 3 (39).

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