Crude acetylene gas purification safety device

Abstract

The utility model relates to cleaning treatment of crude acetylene gas generated by hydrolysis reaction of calcium carbide, and discloses a crude acetylene gas cleaning safety device which comprises a water scrubber, a water mist trapping tower, a concentrated sulfuric acid cleaning tower and a neutralizing tower which are all provided with corresponding circulating pumps, the compressor is arranged in a pipeline for conveying a crude acetylene gas to the water scrubbing tower, a gas outlet of the neutralizing tower is connected to an inlet of the compressor through an acetylene return pipe, and a bottom liquid outlet of the water mist trapping tower is connected to an inlet of a circulating pump of the water scrubbing tower. And the operation is safer, and the production cost can be reduced.

Description

Technical Field

[0001] The utility model relates to a method for purifying crude acetylene gas produced by calcium carbide hydrolysis reaction. Background Art

[0002] In the calcium carbide method of PVC production, the crude acetylene gas produced by the calcium carbide hydrolysis reaction contains harmful impurities such as H2S and PH3. These impurities are generally removed by purification technology to produce acetylene with a volume fraction greater than 98.5%, which is used for vinyl chloride synthesis.

[0003] Currently, the main domestic technologies for crude acetylene purification include sodium hypochlorite and concentrated sulfuric acid purification. Sodium hypochlorite purification is a traditional acetylene purification technology that generates a large amount of waste sodium hypochlorite solution during production. Concentrated sulfuric acid purification utilizes the strong oxidizing properties of concentrated sulfuric acid to remove harmful impurities such as H2S and PH3 from crude acetylene gas. This technology offers stable and reliable production and is currently widely used.

[0004] CN216321059U discloses a device for purifying crude acetylene gas using concentrated sulfuric acid. The main process is as follows: the crude acetylene gas is washed and cooled in a water scrubber, the demister on the top of the water scrubber performs preliminary water and gas separation, and then enters a concentrated sulfuric acid purification tower to remove water and impurities such as H2S and PH3, and finally enters a neutralization tower to remove concentrated sulfuric acid mist entrained in the acetylene gas.

[0005] In the above-mentioned device, the separation effect of the demister is limited, and some water mist will still enter the concentrated sulfuric acid purification tower, which will not only increase the consumption of concentrated sulfuric acid and the generation of waste sulfuric acid, thereby increasing production costs, but may also cause overheating inside the purification tower, posing a safety hazard to the system; in order to avoid catalyst poisoning in the vinyl chloride synthesis section, the concentrated sulfuric acid purification tower is often added with excessive concentrated sulfuric acid, resulting in increased costs; the neutralization tower has no alkali concentration online detector, and the concentrated sulfuric acid mist carried by the acetylene gas may not be completely removed, causing corrosion and perforation of subsequent equipment and pipelines, posing a safety hazard to the production system; in the event of an emergency stop, the acetylene outer pipe that transports acetylene from the neutralization tower outlet to the synthesis process will be depressurized. At this time, the acetylene gas may bring the alkali solution in the neutralization tower back to the concentrated sulfuric acid purification tower. The alkali solution releases heat in contact with the concentrated sulfuric acid, and the inside of the concentrated sulfuric acid purification tower may overheat or even burn, causing the system to stop for a long time.

[0006] Therefore, it is necessary to further improve the above-mentioned purification device to reduce the water mist entrained in the crude acetylene gas, and strive to accurately control the concentrated sulfuric acid concentration in the concentrated sulfuric acid purification tower and the alkali concentration in the neutralization tower, so as to reduce the consumption of concentrated sulfuric acid and liquid alkali, reduce costs and reduce the risk of overheating, and ensure the safety and reliability of the acetylene purification system. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a crude acetylene gas purification safety device with safer operation.

[0008] The technical solution adopted by the utility model to solve the technical problem is: a crude acetylene gas purification safety device includes a water washing tower, a concentrated sulfuric acid purification tower, and a neutralization tower, wherein the water washing tower, the concentrated sulfuric acid purification tower, and the neutralization tower are all equipped with corresponding circulation pumps, and further includes a compressor arranged in a pipeline for conveying crude acetylene gas to the water washing tower, and the gas outlet of the neutralization tower is connected to the inlet of the compressor through an acetylene reflux pipe.

[0009] The acetylene reflux pipe is equipped with an acetylene return process control valve, with acetylene reflux regulating valves connected in parallel at both ends. The acetylene reflux regulating valve is used to divert the acetylene gas flow to the acetylene outer pipe to adjust the production load. The acetylene return process control valve opens when the acetylene outer pipe is depressurized, directly returning the acetylene gas to the compressor inlet. This prevents the acetylene gas from carrying alkali liquor from the neutralization tower to the concentrated sulfuric acid purification tower, thus preventing overheating and ensuring the safety of the device.

[0010] A water mist capture tower is connected between the water scrubber and the concentrated sulfuric acid purification tower. The gas outlet of the water scrubber is connected to the gas inlet of the water mist capture tower, which is then connected to the gas inlet of the concentrated sulfuric acid purification tower. The liquid outlet at the bottom of the water mist capture tower is connected to the inlet of the water scrubber's circulation pump. The water mist capture tower further separates water entrained in the crude acetylene gas flowing out of the top outlet of the water scrubber, reducing concentrated sulfuric acid consumption in the concentrated sulfuric acid purification tower and the risk of overheating in the concentrated sulfuric acid purification tower, thereby lowering production costs. The acetylene-entrained liquid flowing out of the bottom of the water mist capture tower is transported via the water scrubber's circulation pump to the acetylene generation process or the water scrubber for recycling, thus avoiding the risk of acetylene gas leakage.

[0011] The water mist collection tower is provided with a water mist collection tower liquid level gauge, and a water mist collection tower liquid level regulating valve is provided on the pipeline between the bottom liquid outlet of the water mist collection tower and the inlet of the circulation pump of the water washing tower. The liquid level regulating valve is regulated according to the signal of the water mist collection tower liquid level gauge.

[0012] The compressor is a water ring compressor, the outlet of which is connected to a gas-water separator. The gas outlet of the gas-water separator is connected to the gas inlet of a water scrubber, and the liquid outlet of the gas-water separator is connected to the inlet of a water pump. The gas-water separator is equipped with a gas-water separator level gauge, and the outlet pipeline of the water pump is equipped with a gas-water separator level regulating valve, which is regulated by the signal from the gas-water separator level gauge. The acetylene-containing liquid flowing out of the bottom of the gas-water separator is pumped to the acetylene generation process for recycling, thereby avoiding the risk of acetylene gas leakage.

[0013] The neutralization tower is equipped with an alkali replenishment pump, and an alkali concentration online detector is installed on the pipeline from the outlet of the circulation pump of the neutralization tower to the neutralization tower. The alkali replenishment pump is regulated according to the signal of the alkali concentration online detector, striving to accurately control the alkali concentration in the tower, thereby reducing liquid alkali consumption, ensuring the safety and reliability of the acetylene purification system, and reducing production costs.

[0014] The concentrated sulfuric acid purification tower is equipped with an acid feed pump. An acid concentration online detector is installed on the pipeline from the outlet of the circulation pump of the concentrated sulfuric acid purification tower to the concentrated sulfuric acid purification tower. The acid feed pump is regulated according to the signal of the acid concentration online detector to strive for precise control of the acid concentration in the tower, thereby reducing concentrated sulfuric acid consumption, ensuring the safety and reliability of the acetylene purification system, and reducing production costs.

[0015] The beneficial effects of the utility model are as follows: by using the acetylene reflux pipe to guide the acetylene gas at the outlet of the tail of the device and the top of the tower to the compressor inlet of the head of the device, it is avoided that the acetylene gas brings alkali liquid to the concentrated sulfuric acid purification tower during emergency shutdown under abnormal conditions, thereby greatly reducing the risk of overheating; by adding a water mist capture tower to absorb more water entrained in the crude acetylene gas, the water mist entering the concentrated sulfuric acid absorption tower is reduced, the risk of overheating is further reduced, the amount of concentrated sulfuric acid and liquid alkali is reduced, the waste liquid treatment is reduced, and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the composition of the crude acetylene gas purification safety device of the utility model.

[0017] The following are marked in the figure: 1-water ring compressor; 2-gas-water separator; 3-water scrubber; 4-water mist collecting tower; 5-concentrated sulfuric acid purification tower; 6-neutralization tower; 7-water pump; 8-water scrubber circulation pump; 9-concentrated sulfuric acid metering pump; 10-sulphuric acid circulation pump; 11-alkali circulation pump; 12-alkali replenishment pump; 13-gas-water separator level gauge; 14-water scrubber level gauge; 15-water mist collecting tower level gauge; 16-concentrated sulfuric acid purification tower level gauge; 17-neutralization tower level gauge; 18-water scrubber outlet thermometer; 19-concentrated sulfuric acid purification tower upper thermometer; 20-concentrated sulfuric acid purification tower lower thermometer; 21-concentrated sulfuric acid purification Tower outlet thermometer; 22-water washing tower heat exchanger; 23-concentrated sulfuric acid purification tower heat exchanger; 24-neutralization tower heat exchanger; 25-acetylene reflux regulating valve; 26-acetylene reflux program-controlled valve; 27-neutralization tower outlet acetylene program-controlled valve; 28-synthetic inlet acetylene program-controlled valve; 29-gas-water separator liquid level regulating valve; 30-water washing tower liquid level regulating valve; 31-water mist capture tower liquid level regulating valve; 32-concentrated sulfuric acid purification tower liquid level regulating valve; 33-neutralization tower industrial water make-up regulating valve; 34-neutralization tower liquid level regulating valve; 35-concentrated sulfuric acid concentration online detector; 36-alkali concentration online detector, 37-acetylene reflux pipe. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Example:

[0020] like Figure 1 As shown, the crude acetylene gas purification safety device of the present invention purifies crude acetylene gas from the acetylene generation process. The resulting refined acetylene gas is fed to the synthesis process for PVC production. The crude acetylene gas is pressurized by a water ring compressor 1 and then separated into gas and liquid by a gas-water separator 2. The resulting liquid is returned to the acetylene generation process. The resulting gas is fed to a water scrubber 3 for cooling. A mist capture tower 4 removes most of the water carried by the acetylene gas. The gas then enters a concentrated sulfuric acid purification tower 5 to remove water and harmful impurities such as H2S and PH3. Finally, the gas enters a neutralization tower 6 to remove concentrated sulfuric acid mist carried by the gas. The resulting refined acetylene gas is fed to the vinyl chloride synthesis process through the gas outlet of the neutralization tower 6.

[0021] In the device, the gas-water separator 2, the water scrubber 3, the water mist collecting tower 4, the concentrated sulfuric acid purification tower 5 and the neutralization tower 6 are all equipped with corresponding liquid level gauges, and the water scrubber 3, the concentrated sulfuric acid purification tower 5 and the neutralization tower 6 are all equipped with corresponding circulation pumps and heat exchangers; the outlet of the water ring compressor 1 is connected to the inlet of the gas-water separator 2, the gas outlet of the gas-water separator 2 is connected to the gas inlet of the water scrubber 3, and the liquid outlet of the gas-water separator 2 is connected to the inlet of the water pump 7. The water pump 7 is used to return the separated liquid to the acetylene generation process for use, and its outlet is connected to the inlet of the water pump 7. There is a gas-water separator level regulating valve 29 adjusted according to the gas-water separator level gauge 13; the top gas outlet of the water scrubber 3 is connected to the inlet of the water mist capture tower 4, and the top outlet of the water scrubber 3 is also connected to a water scrubber outlet thermometer 18 for detecting the gas temperature at the water scrubber outlet. The bottom liquid outlet of the water scrubber 3 is connected to the inlet of the water scrubber circulation pump 8, and the outlet of the water scrubber circulation pump 8 is connected to the high-temperature medium inlet of the water scrubber heat exchanger 22, and the high-temperature medium outlet of the water scrubber heat exchanger 22 is connected to the water circulation interface in the middle of the water scrubber 3;

[0022] The top gas outlet of the water mist capture tower 4 is connected to the gas inlet of the concentrated sulfuric acid purification tower 5, and the bottom liquid outlet of the water mist capture tower 4 is connected to the inlet of the water scrubber circulating pump 8 through a pipeline. A water mist capture tower liquid level regulating valve 31 is provided on this section of pipeline. The liquid level regulating valve is regulated according to the signal of the water mist capture tower liquid level meter 15. The outlet of the water scrubber circulating pump 8 is further connected to a pipeline provided with a water scrubber liquid level regulating valve 30 to the acetylene generation process, so as to recycle the acetylene gas-containing liquid. The water scrubber liquid level regulating valve 30 is regulated according to the signal of the water scrubber liquid level meter 14.

[0023] The top gas outlet of the concentrated sulfuric acid purification tower 5 is connected to the gas inlet of the neutralization tower 6, the bottom liquid outlet of the concentrated sulfuric acid purification tower 5 is connected to the inlet of the sulfuric acid circulation pump 10, the outlet of the sulfuric acid circulation pump 10 is connected to the high-temperature medium inlet of the concentrated sulfuric acid purification tower heat exchanger 23, and the high-temperature medium outlet of the concentrated sulfuric acid purification tower heat exchanger 23 is respectively connected to the two acid circulation interfaces located at the upper and middle parts of the concentrated sulfuric acid purification tower 5. A concentrated sulfuric acid metering pump 9 is provided at the upper part of the concentrated sulfuric acid purification tower 5 as an acid replenishing pump for replenishing the acid according to the concentration of the sulfuric acid circulation pipe. The concentrated sulfuric acid concentration online detector 35 on the road replenishes concentrated sulfuric acid into the tower. The upper, lower and top outlets of the concentrated sulfuric acid purification tower 5 are connected to thermometers, namely the upper thermometer 19 of the concentrated sulfuric acid purification tower, the lower thermometer 20 of the concentrated sulfuric acid purification tower and the outlet thermometer 21 of the concentrated sulfuric acid purification tower. The outlet of the sulfuric acid circulation pump 10 is further connected to a pipeline with a concentrated sulfuric acid purification tower liquid level regulating valve 32 to the waste sulfuric acid storage tank. The concentrated sulfuric acid purification tower liquid level regulating valve 32 is regulated according to the signal of the concentrated sulfuric acid purification tower liquid level gauge 16;

[0024] The bottom liquid outlet of the neutralization tower 6 is connected to the inlet of the alkali circulation pump 11, the outlet of the alkali circulation pump 11 is connected to the high-temperature medium inlet of the neutralization tower heat exchanger 24, and the high-temperature medium outlet of the neutralization tower heat exchanger 24 is connected to the alkali circulation interface located in the middle of the neutralization tower 6. The upper part of the neutralization tower 6 is provided with an alkali replenishment pump 12 for replenishing liquid alkali into the tower according to the signal of the alkali concentration online detector 36 set on the alkali circulation pipeline. The upper part of the neutralization tower 6 is also provided with a water replenishment pipeline connected to industrial water. The water replenishment pipeline is provided with a neutralization tower industrial water replenishment regulating valve 33 for supplying water to the tower for flushing. The outlet of the alkali circulation pump 11 is connected to another pipeline to the sewage collection tank. A neutralization tower liquid level regulating valve 34 is set on the pipeline. The neutralization tower liquid level regulating valve 34 is regulated according to the signal of the neutralization tower liquid level meter 17. The gas outlet at the top of the neutralization tower is connected to the gas outlet main pipe. The acetylene program-controlled valve 27 and the synthetic inlet acetylene program-controlled valve 28 are arranged on the gas outlet main pipe in sequence. An acetylene reflux pipe 37 is connected from the gas outlet of the neutralization tower to the inlet main pipe of the water ring compressor 1. The acetylene reflux program-controlled valve 26 is installed on the acetylene reflux pipe 37, and the acetylene reflux regulating valve 25 is connected in parallel at both ends of the acetylene reflux program-controlled valve 26.

[0025] When the system is started, the acetylene program-controlled valve 27 at the neutralization tower outlet and the acetylene program-controlled valve 28 at the synthesis inlet are opened, the acetylene reflux program-controlled valve 26 is closed, and the production load is adjusted by adjusting the acetylene reflux regulating valve 25.

[0026] When the system is shut down in an emergency, the acetylene program-controlled valve 27 at the outlet of the neutralization tower and the acetylene program-controlled valve 28 at the inlet of the synthesis are interlocked and closed, and the acetylene return program-controlled valve 26 is interlocked and opened. When the acetylene delivery pipe section connected to the synthesis process after the program-controlled valve 28 for the inlet of the synthesis is depressurized, the acetylene gas flows directly back to the compressor inlet main pipe through the outlet main pipe of the neutralization tower. In this process, it will not pass through the neutralization tower 6 and the concentrated sulfuric acid purification tower 5, and the alkali solution in the neutralization tower 6 will not be brought into the concentrated sulfuric acid purification tower 5, causing the concentrated sulfuric acid purification tower 5 to overheat and burn, thereby improving the safety of the device.

[0027] The gas-water separator 2 is equipped with a gas-water separator liquid level gauge 13, a water pump 7, and a gas-water separator liquid level regulating valve 29. The cooling water generated in the gas-water separator 3 is transported by the water pump 7 and reused in the acetylene generation process through the gas-water separator liquid level regulating valve 29. The gas-water separator liquid level gauge 13 and the gas-water separator liquid level regulating valve 29 realize loop control.

[0028] Water scrubber 3 is equipped with a water scrubber level gauge 14 and a water scrubber circulation pump 8. A water scrubber heat exchanger 22 and a water scrubber level regulating valve 30 are installed at the outlet of water scrubber circulation pump 8. Condensed water within water scrubber 3 is circulated through water scrubber circulation pump 8. A portion of the condensed water returns to water scrubber 3 after passing through water scrubber heat exchanger 22 for internal circulation, while a portion is transported to the acetylene generation process for reuse via water scrubber level regulating valve 30. The water scrubber level gauge 14 and water scrubber level regulating valve 30 implement loop control. A thermometer 18 is installed at the outlet of water scrubber 3 to monitor the acetylene gas temperature at the outlet.

[0029] The water mist collecting tower 4 is equipped with a water mist collecting tower liquid level meter 15 and a water mist collecting tower liquid level regulating valve 31 and realizes loop control. The condensed water generated by the water mist collecting tower 4 enters the water washing tower 3 through the water mist collecting tower liquid level regulating valve 31.

[0030] A concentrated sulfuric acid purification tower outlet thermometer 21 is installed at the outlet of the concentrated sulfuric acid purification tower 5, which is used to detect the acetylene gas temperature at the outlet of the concentrated sulfuric acid purification tower. The upper and lower parts of the concentrated sulfuric acid purification tower 5 are respectively installed with a concentrated sulfuric acid purification tower upper thermometer 19 and a concentrated sulfuric acid purification tower upper and lower thermometers 20, which are used to detect the internal temperature of the concentrated sulfuric acid purification tower. When one of the thermometers reaches the set value, the interlock is immediately triggered and the system is shut down to avoid overheating.

[0031] The concentrated sulfuric acid purification tower 5 is equipped with a concentrated sulfuric acid purification tower liquid level gauge 16 and a sulfuric acid circulation pump 10. The outlet of the sulfuric acid circulation pump 10 is equipped with a concentrated sulfuric acid purification tower liquid level regulating valve 32, a concentrated sulfuric acid purification tower heat exchanger 23, and an online concentrated sulfuric acid concentration detector 35. The concentrated sulfuric acid in the concentrated sulfuric acid purification tower 5 is internally circulated through the sulfuric acid circulation pump 10. A portion of the concentrated sulfuric acid is returned to the concentrated sulfuric acid purification tower 5 after heat exchange in the concentrated sulfuric acid purification tower heat exchanger 23, and a portion is transported to the waste sulfuric acid storage tank through the concentrated sulfuric acid purification tower liquid level regulating valve 32. The concentrated sulfuric acid purification tower liquid level gauge 16 and the concentrated sulfuric acid purification tower liquid level regulating valve 32 realize loop control. The concentrated sulfuric acid purification tower replenishment equipment is a concentrated sulfuric acid metering pump 9, and the concentrated sulfuric acid metering pump 9 and the online concentrated sulfuric acid concentration detector 35 realize loop control.

[0032] The neutralization tower 6 is equipped with a neutralization tower level gauge 17, a neutralization tower water supply regulating valve 33, an alkali supply pump 12, and an alkali circulation pump 11. The outlet of the alkali circulation pump 11 is equipped with a neutralization tower level regulating valve 34, a neutralization tower heat exchanger 24, and an alkali concentration online detector 36. The alkali solution in the neutralization tower 6 is internally circulated through the alkali circulation pump 11. Part of it returns to the neutralization tower 6 after heat exchange in the neutralization tower heat exchanger 24, and part of it goes to the sewage collection tank through the neutralization tower level regulating valve 34. The alkali concentration online detector 36 and the alkali supply pump 12 realize loop control; the neutralization tower level gauge 17 and the neutralization tower industrial water supply regulating valve 33 and the neutralization tower level regulating valve 34 realize loop control. When the neutralization tower 3 is replaced, the neutralization tower industrial water supply regulating valve 33 and the neutralization tower level regulating valve 34 are opened to realize remote replacement.

[0033] The utility model provides an acetylene reflux pipe directly connected to the compressor inlet at the gas outlet of the neutralization tower. In the event of an emergency stop, the acetylene gas flows directly back to the compressor inlet main pipe through the neutralization tower outlet pipe, without passing through the neutralization tower or the concentrated sulfuric acid purification tower. This prevents the alkali solution in the neutralization tower from being brought into the concentrated sulfuric acid purification tower, causing the concentrated sulfuric acid purification tower to overheat and burn, thereby improving the safety of the device. A water mist capture tower is installed after the water scrubber to remove most of the water entrained in the crude acetylene gas, thereby reducing the consumption of concentrated sulfuric acid and the safety risk of overheating during the operation of the concentrated sulfuric acid purification tower. The cooling water with dissolved acetylene gas in the water mist capture tower enters the water scrubber through the water mist capture tower liquid level regulating valve for internal circulation, eliminating the safety hazard caused by the volatilization of acetylene gas discharged from the cooling water. Therefore, the utility model is a safer crude acetylene gas purification device.

Claims

1. A crude acetylene gas purification safety device, comprising a water washing tower (3), a concentrated sulfuric acid purification tower (5), and a neutralization tower (6), wherein the water washing tower (3), the concentrated sulfuric acid purification tower (5), and the neutralization tower (6) are all equipped with corresponding circulation pumps, and further comprising a compressor provided in a pipeline for conveying crude acetylene gas to the water washing tower (3), wherein the device is characterized in that: The gas outlet of the neutralization tower (6) is connected to the inlet of the compressor through an acetylene reflux pipe (37).

2. The crude acetylene gas purification safety device according to claim 1, characterized in that: An acetylene return process control valve (26) is provided on the acetylene return pipe (37), and acetylene return regulating valves (25) are provided in parallel at both ends of the acetylene return process control valve (26).

3. The crude acetylene gas purification safety device according to claim 1, characterized in that: A water mist collecting tower (4) is connected between the water washing tower (3) and the concentrated sulfuric acid purification tower (5): the gas outlet of the water washing tower (3) is connected to the gas inlet of the water mist collecting tower (4), the gas outlet of the water mist collecting tower (4) is connected to the gas inlet of the concentrated sulfuric acid purification tower (5), and the bottom liquid outlet of the water mist collecting tower (4) is connected to the inlet of the water washing tower circulation pump (8).

4. The crude acetylene gas purification safety device according to claim 3, characterized in that: The water mist collecting tower (4) is provided with a water mist collecting tower liquid level meter (15), and a water mist collecting tower liquid level regulating valve (31) is provided on a pipeline between the bottom liquid outlet of the water mist collecting tower (4) and the inlet of the water washing tower circulation pump (8), and the liquid level regulating valve is regulated according to a signal of the water mist collecting tower liquid level meter (15).

5. The crude acetylene gas purification safety device according to claim 1, characterized in that: The compressor is a water ring compressor (1), the outlet of the water ring compressor (1) is connected to the gas-water separator (2), the gas outlet of the gas-water separator (2) is connected to the gas inlet of the water scrubber (3), the liquid outlet of the gas-water separator (2) is connected to the inlet of the water pump (7), the gas-water separator (2) is provided with a gas-water separator liquid level gauge (13), and the outlet pipeline of the water pump (7) is provided with a gas-water separator liquid level regulating valve (29), which is regulated according to the signal of the gas-water separator liquid level gauge (13).

6. The crude acetylene gas purification safety device according to any one of claims 1 to 5, characterized in that: The neutralization tower (6) is equipped with an alkali replenishing pump (12), and an alkali concentration online detector (36) is installed on the pipeline from the outlet of the circulation pump of the neutralization tower (6) to the neutralization tower (6). The alkali replenishing pump (12) is regulated according to the signal of the alkali concentration online detector (36).

7. The crude acetylene gas purification safety device according to any one of claims 1 to 5, characterized in that: The concentrated sulfuric acid purification tower (5) is equipped with an acid replenishing pump. A concentrated sulfuric acid concentration online detector (35) is installed on the pipeline from the outlet of the circulation pump of the concentrated sulfuric acid purification tower (5) to the concentrated sulfuric acid purification tower (5). The acid replenishing pump is regulated according to the signal of the concentrated sulfuric acid concentration online detector (35).

Images