An automated processing system for high-risk gases

Abstract

The present invention discloses an automatic processing system for high-risk gas, which is characterized in that: the system comprises a plurality of gas cylinder pipelines connected in parallel, gas cylinder pressure gauges and gas cylinder pressure sensors are arranged on the gas cylinder pipelines, all gas cylinder pipelines are connected with a first dilution container through a first dilution pipeline, a first pneumatic valve, a first pressure limiting valve and a first check valve are also arranged on the first dilution pipeline, the first dilution container is connected with a second dilution container through a second dilution pipeline, a first dilution container pressure sensor, a second pressure gauge, a second pneumatic valve, a second flow limiting valve and a second check valve are arranged in sequence on the second dilution pipeline, the second dilution container is connected with an alkali liquid pool through a waste gas pipeline, and a second dilution container pressure sensor, a waste gas pneumatic valve and a waste liquid flow limiting valve are arranged in sequence on the waste gas pipeline.

Description

Technical Field

[0001] The invention relates to the field of gas processing, in particular to an automatic processing system for high-risk gases. Background Art

[0002] With the increasing demand for standard gas and electronic gas in China, a large number of high-risk residual gases returned to the cylinders after use by customers need to be handled. These high-risk gases are generally divided into two types, one is toxic and highly irritating, such as phosphine, arsine, hydrogen sulfide and other gases; the other is flammable and explosive gas, such as high-concentration hydrogen, methane and other standard gases. The handling of these high-risk gases and the detoxification of cylinders pose a great threat to the personal safety of related operators.

[0003] In the traditional high-risk residual gas return bottle treatment process, most people only consider releasing and treating most of the high-risk residual gas in the return bottle. However, after the return bottle returns to normal pressure, there will still be a part of residual toxic gas in the bottle. If this part of gas is not properly treated, there will be a great safety hazard. In addition, the entire treatment process requires personnel control, which is risky, time-consuming and labor-intensive, with relatively low work efficiency and occupies more human resources. Therefore, a method or device that can solve the above problems is now needed. Summary of the invention

[0004] The present invention aims to solve the above-mentioned deficiencies in the prior art and proposes a processing system which has a simple structure, ingenious design, reasonable layout, can completely treat all high-risk gases remaining in gas cylinders, and can realize automatic operation.

[0005] The technical solution of the present invention is: an automated high-risk gas processing system, characterized in that: the system comprises a plurality of gas cylinder pipelines 1 connected in parallel, a gas cylinder pressure gauge 2 and a gas cylinder pressure sensor 3 are arranged on the gas cylinder pipeline 1, all gas cylinder pipelines 1 are connected to a first dilution container 5 through a first dilution pipeline 4, a first pneumatic valve 6, a first pressure limiting valve 7 and a first check valve 8 are also arranged on the first dilution pipeline 4, the first dilution container 5 is connected to a second dilution container 10 through a second dilution pipeline 9, a first dilution container pressure sensor 11, a second pressure gauge 12, a second pneumatic valve 13, a second flow limiting valve 14 and a second check valve 15 are arranged in sequence on the second dilution pipeline 9, the second dilution container 10 is connected to an alkali liquid pool 17 through an exhaust gas pipeline 16, a second dilution container pressure sensor 18, an exhaust gas pneumatic valve 19 and a waste liquid flow limiting valve 20 are arranged in sequence on the exhaust gas pipeline 16,

[0006] The system further includes a nitrogen pipeline 21, which is connected in parallel with the first dilution container 5 and the second dilution container 10 through a first nitrogen pipeline 22 and a second nitrogen pipeline 35, respectively. A first nitrogen pneumatic valve 23 and a first nitrogen pressure-limiting valve 24 are provided on the first nitrogen pipeline 22, and a second nitrogen pneumatic valve 25 and a second nitrogen flow-limiting valve 26 are provided on the second nitrogen pipeline 35. At the same time, the nitrogen pipeline 21 is also connected to the gas cylinder pipeline 1 through a third nitrogen pipeline 27, and a third nitrogen pneumatic valve 28 and a third nitrogen pressure-limiting valve 29 are provided on the third nitrogen pipeline 27.

[0007] The system also includes a vacuum pump 30, which is connected to the first dilution pipeline 4 through a vacuum pump pipeline 31, and the connection point between the vacuum pump pipeline 31 and the first dilution pipeline 4 is located between the gas cylinder pressure sensor 3 and the first pneumatic valve 6. At the same time, a vacuum pipeline pneumatic valve 32 and a vacuum degree meter 33 are also provided on the vacuum pump pipeline 31.

[0008] Compared with the prior art, the present invention has the following advantages:

[0009] This type of high-risk gas automatic treatment system has a simple structure, ingenious design, and reasonable layout. It is designed to solve various problems existing in traditional treatment methods. A special structure can automatically treat the return bottle with residual high-risk gas without human intervention, and can also extract the residual high-risk gas and treat it harmlessly when the return bottle returns to normal pressure. The treatment process is perfect and can effectively avoid potential safety hazards in the treatment process. At the same time, the actions of its various actuators (valves) can be automated without the need for manual supervision. While improving work efficiency, it can also save a lot of human resources. In addition, the system has a simple manufacturing process and low manufacturing cost. Therefore, it can be said that it has many advantages and is particularly suitable for promotion and application in this field. Its market prospects are very broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0011] The specific implementation of the present invention will be described below with reference to the accompanying drawings. Figure 1As shown: an automated processing system for high-risk gases, comprising a plurality of gas cylinder pipelines 1 connected in parallel, on which a gas cylinder pressure gauge 2 and a gas cylinder pressure sensor 3 are arranged, all of the gas cylinder pipelines 1 are connected to a first dilution container 5 through a first dilution pipeline 4, on which a first pneumatic valve 6, a first pressure limiting valve 7 and a first check valve 8 are also arranged, the first dilution container 5 is connected to a second dilution container 10 through a second dilution pipeline 9, on which a first dilution container pressure sensor 11, a second pressure gauge 12, a second pneumatic valve 13, a second flow limiting valve 14 and a second check valve 15 are arranged in sequence, the second dilution container 10 is connected to an alkali liquid pool 17 through an exhaust gas pipeline 16, on which a second dilution container pressure sensor 18, an exhaust gas pneumatic valve 19 and a waste liquid flow limiting valve 20 are arranged in sequence,

[0012] The system further includes a nitrogen pipeline 21, which is connected in parallel with the first dilution container 5 and the second dilution container 10 through a first nitrogen pipeline 22 and a second nitrogen pipeline 35, respectively. A first nitrogen pneumatic valve 23 and a first nitrogen pressure-limiting valve 24 are provided on the first nitrogen pipeline 22, and a second nitrogen pneumatic valve 25 and a second nitrogen flow-limiting valve 26 are provided on the second nitrogen pipeline 35. At the same time, the nitrogen pipeline 21 is also connected to the gas cylinder pipeline 1 through a third nitrogen pipeline 27, and a third nitrogen pneumatic valve 28 and a third nitrogen pressure-limiting valve 29 are provided on the third nitrogen pipeline 27.

[0013] The system also includes a vacuum pump 30, which is connected to the first dilution pipeline 4 through a vacuum pump pipeline 31, and the connection point between the vacuum pump pipeline 31 and the first dilution pipeline 4 is located between the gas cylinder pressure sensor 3 and the first pneumatic valve 6. At the same time, a vacuum pipeline pneumatic valve 32 and a vacuum degree meter 33 are also provided on the vacuum pump pipeline 31.

[0014] The working process of the automatic treatment system for high-risk gases in the embodiment of the present invention is as follows: first, the steel cylinder 34 to be treated is connected to the gas cylinder pipeline 1 (the valve mouth on the steel cylinder 34 is closed), and then the vacuum pipeline pneumatic valve 32 on the vacuum pump pipeline 31 is opened, and the vacuum pump 30 is started to evacuate the system. During the evacuation process, the reading on the vacuum meter 33 is observed. After reaching a suitable vacuum degree, the vacuum pump 30 is turned off, and the vacuum pipeline pneumatic valve 32 is closed (a digital vacuum meter can also be used. When the vacuum degree in the system reaches a preset value, it automatically sends a signal to the control system, and the control system then controls the vacuum pump 30 and the vacuum pipeline pneumatic valve 32 to close).

[0015] The operator opens the valves on all the cylinders 34 and the first pneumatic valve 6 on the first dilution pipeline 4 at the same time. The residual high-risk gas in the cylinder 34 will automatically enter the first dilution container 5 through the first dilution pipeline 4. The first pressure-limiting valve 7 can limit the air pressure in the first dilution pipeline 4, and the first check valve 8 can prevent the high-risk gas from flowing back. With the input of the high-risk gas, the pressure in the first dilution container 5 gradually increases. During this process, the first dilution container pressure sensor 11 always monitors the pressure in the first dilution container 5. If the pressure therein reaches the trigger value, a signal is sent to the control system. The control system controls the first pneumatic valve 6 to close and opens the first nitrogen pneumatic valve 23 on the first nitrogen pipeline 22 to introduce nitrogen into the first dilution container 5. The pressure in the first dilution container 5 continues to increase. After reaching the next trigger value, the control system closes the first nitrogen pneumatic valve 23 and opens the second pneumatic valve 13 on the second dilution pipeline 9 (in the above process, the operator can observe the above pressure changes through the second pressure gauge 12).

[0016] The diluted gas after the primary dilution will enter the second dilution container 10 through the second dilution pipeline 9. The second flow limiting valve 14 can control the flow of the gas entering the second dilution container 10 to a limited extent, and the second check valve 15 can prevent the dilution gas from flowing back. When the primary dilution gas enters the second dilution container 10, the control system will also control the second nitrogen pneumatic valve 25 on the second nitrogen pipeline 35 to open, and send nitrogen into the second dilution container 10. Under the action of the second nitrogen flow limiting valve 26, the amount of nitrogen entering the second dilution container 10 per unit time is controllable. By adjusting the second flow limiting valve 14 and the second single-stage flow limiting valve 26, the amount of nitrogen entering the second dilution container 10 per unit time can be adjusted. The ratio of the dilution gas and nitrogen in the dilution container 10 is adjusted, and the two gases enter the second dilution container 10 at the same time, thereby realizing high-efficiency online dilution (here, secondary dilution); during this process, the second dilution container pressure sensor 18 always monitors the pressure in the second dilution container 10. After reaching the trigger value, the control system controls the second pneumatic valve 13 and the second nitrogen pipeline 35 to close, the exhaust gas pneumatic valve 19 to open, and the secondary dilution gas is passed into the alkali liquid pool 17 for the final harmless treatment; and when the second dilution container pressure sensor 18 detects that the pressure in the second dilution container 10 is less than a certain trigger value, it controls the second pneumatic valve 13 to reopen to perform another dilution process;

[0017] During the secondary dilution process, the first dilution container 5 still repeats the primary dilution operation, continuously diluting the high-risk gas in the cylinder 34, and sending the diluted gas after the primary dilution to the secondary dilution container 10 for secondary dilution. That is to say, the first dilution system with the first dilution container 5 as the core and the second dilution system with the second dilution container 10 as the core will each perform independent dilution operations, and finally discharge the diluted gas after two dilutions into the alkali liquid pool 17.

[0018] As the high-risk gases remaining in all the steel cylinders 34 are continuously diluted and discharged, the pressure in the main pipeline gradually decreases. When the cylinder pressure sensor 3 detects that the pressure in the cylinder pipeline 1 is less than the preset trigger value, a signal is sent to the control system, and the control system controls the first pneumatic valve 6 to close, and opens the third nitrogen pneumatic valve 28 on the third nitrogen pipeline 27, injects nitrogen into the cylinder 34, and detoxifies the pipeline and the cylinder 34. When the cylinder pressure sensor 3 detects that the pressure in the cylinder pipeline 1 reaches the dilution trigger value again, the third nitrogen pneumatic valve 28 is first closed, and then the first pneumatic valve 6 is opened, and then the primary dilution, secondary dilution and dilution gas discharge operations as described above are performed until the main pipeline pressure drops to the trigger value again;

[0019] After repeated operations, the residual gas in the cylinder 34 and each pipeline has been diluted to a safe concentration (the specific number of operations can be determined according to the type and quantity of high-risk gas in the cylinder 34). The valve mouth of the cylinder 34 can be closed and the cylinder 34 can be removed, or the vacuum pump 30 of this system can be used to directly evacuate the cylinder 34.

Claims

1. A high-risk gas automated processing system, characterized in that: The system comprises a plurality of gas cylinder pipelines (1) connected in parallel, wherein the gas cylinder pipelines (1) are provided with gas cylinder pressure gauges (2) and gas cylinder pressure sensors (3), all of the gas cylinder pipelines (1) are connected to a first dilution container (5) via a first dilution pipeline (4), the first dilution pipeline (4) is further provided with a first pneumatic valve (6), a first pressure limiting valve (7) and a first check valve (8), the first dilution container (5) is connected to a second dilution container (10) via a second dilution pipeline (9), the second dilution pipeline (9) is provided with a first dilution container pressure sensor (11), a second pressure gauge (12), a second pneumatic valve (13), a second flow limiting valve (14) and a second check valve (15) in sequence, the second dilution container (10) is connected to an alkali liquid pool (17) via an exhaust gas pipeline (16), the exhaust gas pipeline (16) is provided with a second dilution container pressure sensor (18), an exhaust gas pneumatic valve (19) and a waste liquid flow limiting valve (20) in sequence, The system further comprises a nitrogen pipeline (21), wherein the nitrogen pipeline (21) is connected in parallel with the first dilution container (5) and the second dilution container (10) via a first nitrogen pipeline (22) and a second nitrogen pipeline (35), respectively; a first nitrogen pneumatic valve (23) and a first nitrogen pressure limiting valve (24) are arranged on the first nitrogen pipeline (22), and a second nitrogen pneumatic valve (25) and a second nitrogen flow limiting valve (26) are arranged on the second nitrogen pipeline (35); and the nitrogen pipeline (21) is also connected to the gas cylinder pipeline (1) via a third nitrogen pipeline (27), and a third nitrogen pneumatic valve (28) and a third nitrogen pressure limiting valve (29) are arranged on the third nitrogen pipeline (27). The system further comprises a vacuum pump (30), wherein the vacuum pump (30) is connected to the first dilution pipeline (4) via a vacuum pump pipeline (31), and the connection point between the vacuum pump pipeline (31) and the first dilution pipeline (4) is located between the gas cylinder pressure sensor (3) and the first pneumatic valve (6), and a vacuum pipeline pneumatic valve (32) and a vacuum gauge (33) are also provided on the vacuum pump pipeline (31).

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