Acetylene recovery system

Abstract

The utility model provides an acetylene recovery system which is characterized in that an acetylene absorption tower, a desorption tower, a plate heat exchanger, a normal-pressure degassing tower and a vacuum degassing tower which are sequentially connected in series are arranged, waste gas containing acetylene gas output from a waste gas pipeline is firstly absorbed and enriched in the acetylene absorption tower by utilizing a solvent, and then a carrier gas solvent enriched with the acetylene gas is fed into the acetylene absorption tower to be recycled. The acetylene gas is released in the desorption tower, the carrier gas solvent which does not completely release the acetylene gas is heated by the plate heat exchanger and then sequentially enters the normal-pressure degassing tower and the vacuum degassing tower to release the acetylene gas in the carrier gas solvent step by step, so that the acetylene gas in the carrier gas solvent is fully released, and the released acetylene gas is merged into the desorption tower to be recycled in a centralized manner. According to the system disclosed by the invention, the acetylene gas which is not completely reacted in the BDO synthesis process is recycled through matched use of the equipment, and the defect that in a traditional mode, the acetylene gas which is not completely reacted is introduced into a torch to be combusted, so that resources are wasted is overcome.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas recovery, and in particular to an acetylene recovery system. Background Art

[0002] 1,4-Butanediol (BDO), also known as 1,4-dihydroxybutane and 1,4-butylene glycol, is an important fine chemical and organic raw material, and is widely used in the fields of medicine, papermaking, chemical industry and daily chemical industry. At present, the main production process of BDO is the improved Reppe method, and its simple process is: acetylene and formaldehyde with a mass concentration of 37% are fed into the butynediol reactor, and the reaction is carried out under the catalyst Cu-Bi, 95°C and pressure. The generated butynediol is then hydrogenated to obtain 1,4-butanediol.

[0003] In the above-mentioned reaction process of acetylene and formaldehyde, in order to ensure that formaldehyde reacts fully, the acetylene introduced into the butynediol reactor is often excessive, which results in a large amount of acetylene gas failing to react and being treated as tail gas after the reaction. In the existing treatment method, in order to simplify the tail gas treatment, the manufacturer will pass the tail gas containing acetylene obtained after the butynediol reaction into a torch for combustion treatment, which results in a large amount of acetylene gas failing to be recovered and wasted. Utility Model Content

[0004] The present application provides an acetylene recovery system to solve the problem of waste of resources caused by passing acetylene gas that has not been completely reacted into a flare for combustion.

[0005] The present application provides an acetylene recovery system, comprising an exhaust gas pipeline, an acetylene absorption tower, a desorption tower, a plate heat exchanger, a normal pressure degassing tower and a vacuum degassing tower connected in series in sequence;

[0006] The acetylene absorption tower is also connected to the solvent pipeline and the tail gas pipeline respectively;

[0007] The gas output end of the desorption tower is connected to the acetylene gas main pipe;

[0008] The gas output end of the atmospheric pressure degassing tower is also connected to the gas input end of the desorption tower;

[0009] The vacuum degassing tower is also connected to the atmospheric degassing tower via a first air compressor;

[0010] The vacuum degassing tower is also connected to a circulation pump to form a loop; the output end of the circulation pump is also connected to a solvent storage tank.

[0011] Optionally, a heater is further provided between the output end of the circulation pump and the vacuum degassing tower.

[0012] Optionally, a gas purification device and a second air compressor are sequentially arranged between the exhaust gas pipeline and the acetylene absorption tower.

[0013] Optionally, a first condenser and a separator are sequentially connected between the vacuum degassing tower and the input end of the first air compressor;

[0014] The liquid output end of the separator is also connected to a vacuum degassing tower.

[0015] Optionally, a demister is further provided between the gas output end of the desorption tower and the acetylene gas main pipe.

[0016] Optionally, the acetylene absorption tower comprises a tower body;

[0017] The tower body includes an absorption part at the bottom and a water washing part at the top. A gas outlet is provided at the top of the tower body. A multi-layer perforated plate is provided in the water washing part. A spray pipe is provided between the gas outlet and the uppermost perforated plate.

[0018] The bottom of the absorption part is provided with a liquid discharge port, the side of the middle part is provided with an absorption liquid inlet, and the lower part of the side is provided with an exhaust gas inlet.

[0019] Optionally, an opening is provided in the middle of the vacuum degassing tower and is sequentially connected to the second condenser, the water washing tower, the third condenser, and the third air compressor; the second condenser is also connected to the solvent storage tank.

[0020] The present application provides an acetylene recovery system, which is provided with an acetylene absorption tower, a desorption tower, a plate heat exchanger, an atmospheric pressure degassing tower and a vacuum degassing tower connected in series in sequence, and the waste gas containing acetylene gas output from the waste gas pipeline is first absorbed and enriched by a solvent in the acetylene absorption tower, and then the carrier gas solvent enriched with acetylene gas is used to release the acetylene gas in the desorption tower, and the carrier gas solvent that has not completely released the acetylene gas is heated by the plate heat exchanger and then enters the atmospheric pressure degassing tower and the vacuum degassing tower in sequence to release the acetylene gas step by step, so that the acetylene gas in the carrier gas solvent is fully released, and the released acetylene gas is combined into the desorption tower for centralized recovery. The system of the present application recovers the acetylene gas that has not been completely reacted in the process of synthesizing BDO through the coordinated use of the above-mentioned equipment, which has the beneficial effect of saving resources and overcomes the disadvantage of the traditional method of passing the acetylene gas that has not been completely reacted into the torch for combustion and causing waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of an acetylene recovery system provided in one embodiment of the present application;

[0023] Figure 2 A schematic diagram of an acetylene recovery system provided in another embodiment of the present application;

[0024] Figure 3 A schematic diagram of an acetylene recovery system provided in yet another embodiment of the present application;

[0025] Figure 4 A schematic diagram of the structure of an acetylene absorption tower provided in one embodiment of the present application;

[0026] Figure 5 A schematic diagram of an acetylene recovery system provided in yet another embodiment of the present application.

[0027] Description of reference numerals:

[0028] 1. Waste gas pipeline; 2. Acetylene absorption tower; 3. Desorption tower; 4. Plate heat exchanger; 5. Atmospheric pressure degassing tower; 6. Vacuum degassing tower; 7. Solvent storage tank; 8. Defogger; 10. Solvent pipeline; 20. Tail gas pipeline; 21. Gas purification device; 22. Second air compressor; 23. Orifice plate; 24. Spray pipe; 30. Acetylene gas main pipe; 61. First air compressor; 62. Circulation pump; 63. Heater; 64. First condenser; 65. Separator; 200. Tower body; 201. Gas outlet; 202. Drain port; 203. Absorption liquid inlet; 204. Waste gas inlet; 611. Second condenser; 612. Water washing tower; 613. Third condenser; 614. Third air compressor. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are 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 creative work also fall within the scope of protection of the present application.

[0030] like Figure 1 As shown, the present application provides an acetylene recovery system, comprising an exhaust gas pipeline 1, an acetylene absorption tower 2, a desorption tower 3, a plate heat exchanger 4, a normal pressure degassing tower 5 and a vacuum degassing tower 6 connected in series in sequence;

[0031] The acetylene absorption tower 2 is also connected to the solvent pipeline 10 and the tail gas pipeline 20 respectively;

[0032] The gas output end of the desorption tower 3 is connected to the acetylene gas main pipe 30;

[0033] The gas output end of the atmospheric pressure degassing tower 5 is also connected to the gas input end of the desorption tower 3;

[0034] The vacuum degassing tower 6 is also connected to the atmospheric degassing tower 5 via a first air compressor 61;

[0035] The vacuum degassing tower 6 is also connected to a circulation pump 62 to form a loop; the output end of the circulation pump 62 is also connected to the solvent storage tank 7 .

[0036] When in use, the waste gas containing acetylene (the content of acetylene is 70-85%) output from the waste gas pipeline 1 enters the acetylene absorption tower 2 from bottom to top, and at the same time, the solvent (N-methylpyrrolidone in the present application) supplied by the solvent pipeline 10 enters the acetylene absorption tower 2 from top to bottom, countercurrently contacts with the input waste gas, absorbs the acetylene in the waste gas, and the absorbed waste gas is washed with water at the top of the acetylene absorption tower 2 to remove the solvent and then discharged into the tail gas pipeline 20 for centralized treatment. The solvent that absorbs acetylene gas, that is, the carrier gas solvent, is discharged from the bottom of the acetylene absorption tower 2.

[0037] The carrier gas solvent discharged from the acetylene absorption tower 2 enters from the middle part of the desorption tower 3. At the same time, the acetylene-rich gas (acetylene content is greater than 98%) with a certain temperature output from the atmospheric degassing tower 5 enters from the lower part of the desorption tower 3, and is countercurrently contacted with the carrier gas solvent for heat exchange to release the acetylene gas absorbed in the carrier gas solvent. Part of the acetylene gas released from the carrier gas solvent is combined with the acetylene-rich gas after heating and enters the upper part of the desorption tower 3. After being washed with clean water sprayed on the upper part of the desorption tower 3 (the structures of the acetylene absorption tower 2 and the desorption tower 3 are the same), it is discharged from the top of the tower and enters the acetylene gas main pipe 30 for recovery. However, in the desorption tower 3, there is still some acetylene gas dissolved in the solvent and cannot be completely desorbed. The desorbed carrier gas solvent is output from the desorption tower 3, and is heat-exchanged to a certain temperature (for example, 60-70°C) by the plate heat exchanger 4. The carrier gas solvent after heat exchange enters the atmospheric degassing tower 5 from the upper part, and is countercurrently contacted with the acetylene gas sucked from the vacuum degassing tower 6 by the first air compressor 61 in the atmospheric degassing tower 5, so as to further release the acetylene gas in the carrier gas solvent. The released acetylene gas is discharged from the top of the atmospheric degassing tower 5 into the desorption tower 3, and is countercurrently contacted with the carrier gas solvent from the acetylene absorption tower 2 for heat exchange, and the corresponding desorption process is carried out.

[0038] The carrier gas solvent from which acetylene gas is released in the atmospheric pressure degassing tower 5 is output from the atmospheric pressure degassing tower 5 and enters the vacuum degassing tower 6 from the upper part. Due to the suction of the first air compressor 61, the air pressure in the tower is reduced, which promotes the more complete release of acetylene gas in the carrier gas solvent. The sucked acetylene gas enters the first air compressor 61 for pressurization and is then output to the atmospheric pressure degassing tower 5 for contact with the heated carrier gas solvent, which promotes the release of acetylene gas in the carrier gas solvent.

[0039] The solvent from which acetylene gas is released in the vacuum degassing tower 6 is output from the bottom of the tower, passes through a circulation pump 62, and is then input into the vacuum degassing tower 6 for circulation degassing so that the acetylene in the solvent is fully released. After a certain number of cycles, the solvent at the bottom of the tower is transferred to a solvent storage tank 7 through a circulation pump 62 for recovery.

[0040] The present application provides an acetylene recovery system, which is provided with an acetylene absorption tower 2, a desorption tower 3, a plate heat exchanger 4, a normal pressure degassing tower 5 and a vacuum degassing tower 6 connected in series in sequence, and the waste gas containing acetylene gas output from the waste gas pipeline 1 is first absorbed and enriched by a solvent in the acetylene absorption tower 2, and then the carrier gas solvent enriched with acetylene gas releases the acetylene gas in the desorption tower 3, and the carrier gas solvent that has not completely released the acetylene gas is heated by the plate heat exchanger 4 and sequentially enters the normal pressure degassing tower 5 and the vacuum degassing tower 6 to release the acetylene gas therein step by step, so that the acetylene gas in the carrier gas solvent is fully released, and the released acetylene gas is combined into the desorption tower 3 for centralized recovery. The system of the present application recovers the acetylene gas that has not been completely reacted in the process of synthesizing BDO through the coordinated use of the above-mentioned equipment, which has the beneficial effect of saving resources and overcomes the disadvantage of waste of resources caused by passing the acetylene gas that has not been completely reacted into the torch for combustion in the traditional method.

[0041] like Figure 2 As shown, optionally, a heater 63 is further provided between the output end of the circulation pump 62 and the vacuum degassing tower 6 .

[0042] In the present application, a heater 63 is further provided between the output end of the circulation pump 62 and the vacuum degassing tower 6, which can keep the carrier gas solvent circulating into the vacuum degassing tower 6 at a relatively high temperature so that the acetylene gas therein can be fully released and recovered.

[0043] like Figure 3 As shown, optionally, a gas purification device 21 and a second air compressor 22 are sequentially arranged between the exhaust gas pipeline 1 and the acetylene absorption tower 2.

[0044] In the present application, since the exhaust gas is washed to remove the formaldehyde mixed in it, a small amount of water will be mixed in it. In order to avoid the adverse effects of water on the operation of the second air compressor 22, the water mixed in the gas is removed by a gas purification device 21 (the gas purification device 21 in the present application is a gas-liquid separator). After the gas with water removed is compressed and pressurized by the second air compressor 22, its flow rate is increased to facilitate the continuous progress of the subsequent treatment process.

[0045] like Figure 3 As shown, optionally, a first condenser 64 and a separator 65 are connected in sequence between the vacuum degassing tower 6 and the input end of the first air compressor 61;

[0046] The liquid output end of the separator 65 is also connected to the vacuum degassing tower 6 .

[0047] In the present application, since the carrier gas solvent is mixed with water (brought in by the process of spraying and washing solvent at the top of the tower) in the acetylene absorption tower 2 and desorption tower 3 in the previous order, the carrier gas solvent temperature entering the vacuum degassing tower 6 is relatively high (50-60°C), and the vacuum degassing tower 6 is under negative pressure, the gas phase extracted from the top of the vacuum degassing tower 6 by the first air compressor 61 is mixed with water and a small amount of solvent. In order to avoid the adverse effect of water on the first air compressor 61, the extracted gas phase is cooled by the first condenser 64 to condense the water vapor therein, and gas-water separation is performed in the separator 65. The separated acetylene gas enters the first air compressor 61 for pressurization, and then is supplied to the atmospheric pressure degassing tower 5 for contact with the heated carrier gas solvent to promote the release of acetylene gas in the carrier gas solvent. The liquid separated in the separator 65, which is mixed with water and a small amount of solvent, is supplied to the vacuum degassing tower 6 for recovery.

[0048] like Figure 3 As shown, optionally, a demister 8 is further provided between the gas output end of the desorption tower 3 and the acetylene gas main pipe 30 .

[0049] In the present application, the structure of the desorption tower 3 is the same as that of the acetylene absorption tower 2. A spray device is also provided at the top of the desorption tower 3 to wash the acetylene gas to remove the solvent mixed therein. Therefore, water vapor will be mixed in the acetylene gas after washing. The demister 8 is provided to remove the water vapor in the acetylene gas.

[0050] like Figure 4 As shown, optionally, the acetylene absorption tower 2 includes a tower body 200;

[0051] The tower body 200 includes an absorption part at the bottom and a water washing part at the top. A gas outlet 201 is provided at the top of the tower body 200. A multi-layer perforated plate 23 is provided in the water washing part. A spray pipe 24 is provided between the gas outlet 201 and the uppermost perforated plate 23.

[0052] A liquid discharge port 202 is provided at the bottom of the absorption part, an absorption liquid inlet 203 is provided at the side of the middle part, and an exhaust gas inlet 204 is provided at the lower part of the side.

[0053] In the present application, when in use, the waste gas containing acetylene gas enters the acetylene absorption tower 2 from the waste gas inlet 204 at the lower side of the tower body 200 of the acetylene absorption tower 2 from bottom to top. At the same time, the solvent (N-methylpyrrolidone in the present application) supplied by the solvent pipeline 10 enters the tower body 200 from the absorption liquid inlet 203 at the side of the absorption part of the tower body 200 from top to bottom, and countercurrently contacts the waste gas input from the waste gas inlet 204 to absorb the acetylene in the waste gas. The absorbed waste gas enters the water washing part at the upper part of the tower body 200, and the solvent in the waste gas is washed by the clean water sprayed by the spray pipe 24. The washed waste gas is discharged from the gas outlet 201 at the top of the tower and enters the tail gas pipeline 20 for treatment. The clean water washed with the solvent falls to the bottom of the tower through the orifice plate 23 arranged on the water washing part, and is combined with the carrier gas solvent that absorbs the acetylene gas, and is discharged from the liquid discharge port 202 at the bottom of the tower.

[0054] like Figure 5 As shown, optionally, the middle of the vacuum degassing tower 6 is provided with an opening and is sequentially connected to the second condenser 611, the water washing tower 612, the third condenser 613, and the third air compressor 614;

[0055] The second condenser 611 is also connected to the solvent storage tank 7 .

[0056] In the present application, when in use, in the vacuum degassing tower 6, since the carrier gas solvent is mixed with water and the carrier gas solvent has a certain temperature, and the tower is in a negative pressure state, the water in the solvent will also evaporate to form water vapor, which will gather in the middle of the tower. At this time, this part of the water vapor is extracted from the vacuum degassing tower 6 and condensed by the second condenser 611, and the condensate is recovered to the solvent storage tank 7 (the condensate at this time has a high content of solvent and has recycling value). The condensed gas is washed with solvent by the water washing tower 612, and then condensed by the third condenser 613 (the gas after water washing does not contain solvent and is basically water vapor), and the non-condensable gas (mainly air) is compressed and pressurized by the third air compressor 614 and discharged, or discharged into the corresponding processing equipment such as an incinerator for treatment before discharge.

[0057] An acetylene recovery system, the working process of which is as follows:

[0058] When in use, the waste gas containing acetylene (the content of acetylene is 70-85%) output from the waste gas pipeline 1 is mixed with a small amount of water because the waste gas is washed to remove the formaldehyde mixed therein. In order to avoid the adverse effect of the water on the operation of the second air compressor 22, the water mixed in the gas is removed by the gas purification device 21 (the gas purification device 21 in this application is a gas-liquid separator). After the gas without water is compressed and pressurized by the second air compressor 22, its flow rate is increased and the gas is discharged from the waste gas inlet 204 at the lower part of the side of the tower body 200 of the acetylene absorption tower 2. It enters the acetylene absorption tower 2 from bottom to top. At the same time, the solvent (N-methylpyrrolidone in this application) supplied by the solvent pipeline 10 enters the tower body 200 from the absorption liquid inlet 203 on the side of the absorption part of the tower body 200 from top to bottom, and countercurrently contacts the exhaust gas input from the exhaust gas inlet 204 to absorb the acetylene in the exhaust gas. The exhaust gas after absorption enters the water washing part at the top of the tower body 200, and the solvent in the exhaust gas is washed by the clean water sprayed by the spray pipe 24. The washed exhaust gas is discharged from the gas outlet 201 at the top of the tower and enters the tail gas pipeline 20 for treatment. The clean water washed with the solvent falls to the bottom of the tower through the orifice plate 23 arranged on the water washing part, and is combined with the carrier gas solvent that absorbs the acetylene gas, and is discharged from the drain port 202 at the bottom of the tower.

[0059] The carrier gas solvent discharged from the acetylene absorption tower 2 enters from the middle part of the desorption tower 3. At the same time, the acetylene-rich gas (acetylene content is greater than 98%) with a certain temperature output from the atmospheric pressure degassing tower 5 enters from the lower part of the desorption tower 3, and is countercurrently contacted with the carrier gas solvent for heat exchange to release the acetylene gas absorbed in the carrier gas solvent. Part of the acetylene gas released from the carrier gas solvent is combined with the acetylene-rich gas after heating and enters the upper part of the desorption tower 3. After being washed with clean water sprayed on the upper part of the desorption tower 3 (the structures of the acetylene absorption tower 2 and the desorption tower 3 are the same), it is discharged from the top of the tower, and after passing through a demister 8 (such as a wire mesh demister or a corrugated plate demister, etc.) to remove water vapor in the acetylene gas, it is discharged into the acetylene gas main pipe 30 for recovery. However, in the desorption tower 3, there is still some acetylene gas dissolved in the solvent and cannot be completely desorbed. The desorbed carrier gas solvent is output from the desorption tower 3, and is heat-exchanged to a certain temperature (for example, 60-70°C) by the plate heat exchanger 4. The carrier gas solvent after heat exchange enters the atmospheric degassing tower 5 from the upper part, and is countercurrently contacted with the acetylene gas sucked from the vacuum degassing tower 6 by the first air compressor 61 in the atmospheric degassing tower 5, so as to further release the acetylene gas in the carrier gas solvent. The released acetylene gas is discharged from the top of the atmospheric degassing tower 5 into the desorption tower 3, and is countercurrently contacted with the carrier gas solvent from the acetylene absorption tower 2 for heat exchange, and the corresponding desorption process is carried out.

[0060] The carrier gas solvent that has released acetylene gas in the atmospheric degassing tower 5 is output from the atmospheric degassing tower 5 and enters the vacuum degassing tower 6 from the upper part. Due to the suction of the first air compressor 61, the air pressure in the tower is reduced, which promotes the more complete release of acetylene gas in the carrier gas solvent. Since the carrier gas solvent is mixed with water (brought in by the process of spraying and washing solvent at the top of the tower) in the previous acetylene absorption tower 2 and desorption tower 3, the temperature of the carrier gas solvent entering the vacuum degassing tower 6 is relatively high (50-60° C.), and the vacuum degassing tower 6 is negative pressure, so the gas phase extracted from the top of the vacuum degassing tower 6 by the first air compressor 61 is mixed with water and a small amount of solvent. Therefore, the extracted gas phase is cooled by the first condenser 64 to condense the water vapor therein, and gas-water separation is performed in the separator 65. The separated acetylene gas enters the first air compressor 61 for pressurization, and then is supplied to the atmospheric degassing tower 5 for contact with the heated carrier gas solvent, promoting the release of acetylene gas in the carrier gas solvent. The liquid separated in the separator 65 contains water and a small amount of solvent, which is input into the vacuum degassing tower 6 for recovery.

[0061] The solvent from which acetylene gas is released in the vacuum degassing tower 6 is output from the bottom of the tower, passed through a circulation pump 62, pumped into a heater 63 for heat exchange and temperature increase again (for example, to 60-70° C.), and then input into the vacuum degassing tower 6 for circulation and degassing, so that the acetylene in the solvent is fully released. After a certain number of cycles, the solvent at the bottom of the tower is transferred to a solvent storage tank 7 through a circulation pump 62 for recovery.

[0062] In the vacuum degassing tower 6, since the carrier gas solvent is mixed with water and the carrier gas solvent has a certain temperature, and the tower is in a negative pressure state, the water in the solvent will also evaporate to form water vapor, which will gather in the middle of the tower. At this time, this part of the water vapor is extracted from the vacuum degassing tower 6 and condensed by the second condenser 611, and the condensate is recovered to the solvent storage tank 7 (the condensate at this time has a high solvent content and has recycling value). The condensed gas passes through the water washing tower 612 to wash away the solvent therein, and then passes through the third condenser 613 to condense (the gas after water washing does not contain solvent and is basically water vapor), and the non-condensable gas (mainly air) is compressed and pressurized by the third air compressor 614 and then discharged, or discharged into corresponding processing equipment such as an incinerator for treatment before discharge.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An acetylene recovery system, characterized in that: It comprises an exhaust gas pipeline (1), an acetylene absorption tower (2), a desorption tower (3), a plate heat exchanger (4), a normal pressure degassing tower (5) and a vacuum degassing tower (6) which are sequentially connected in series; The acetylene absorption tower (2) is also connected to the solvent pipeline (10) and the tail gas pipeline (20) respectively; The gas output end of the desorption tower (3) is connected to the acetylene gas main pipe (30); The gas output end of the atmospheric pressure degassing tower (5) is also connected to the gas input end of the desorption tower (3); The vacuum degassing tower (6) is also connected to the atmospheric degassing tower (5) via a first air compressor (61); The vacuum degassing tower (6) is also connected to a circulation pump (62) to form a loop; and the output end of the circulation pump (62) is also connected to a solvent storage tank (7).

2. The acetylene recovery system according to claim 1, characterized in that: A heater (63) is also provided between the output end of the circulation pump (62) and the vacuum degassing tower (6).

3. The acetylene recovery system according to claim 1, characterized in that: A gas purification device (21) and a second air compressor (22) are arranged in sequence between the waste gas pipeline (1) and the acetylene absorption tower (2).

4. The acetylene recovery system according to claim 1, characterized in that: A first condenser (64) and a separator (65) are sequentially connected between the vacuum degassing tower (6) and the input end of the first air compressor (61); The liquid output end of the separator (65) is also connected to the vacuum degassing tower (6).

5. The acetylene recovery system according to claim 1, characterized in that: A demister (8) is also provided between the gas output end of the desorption tower (3) and the acetylene gas main pipe (30).

6. The acetylene recovery system according to claim 1, characterized in that: The acetylene absorption tower (2) comprises a tower body (200); The tower body (200) comprises a lower absorption part and an upper water washing part. A gas outlet (201) is provided at the top of the tower body (200). A plurality of layers of perforated plates (23) are provided in the water washing part. A spray pipe (24) is provided between the gas outlet (201) and the uppermost layer of the perforated plate (23). The bottom of the absorption part is provided with a liquid discharge port (202), the side of the middle part is provided with an absorption liquid inlet (203), and the lower part of the side is provided with a waste gas inlet (204).

7. The acetylene recovery system according to any one of claims 1 to 6, characterized in that: The vacuum degassing tower (6) is provided with an opening in the middle thereof and is connected to the second condenser (611), the water washing tower (612), the third condenser (613), and the third air compressor (614) in sequence; The second condenser (611) is also connected to the solvent storage tank (7).

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