An industrial gas recovery apparatus and storage system

Abstract

This invention discloses an industrial gas recovery device and storage system, belonging to the field of industrial gas storage technology. It includes a tank body, an inner tubing column, and a recovery tank. The tank body includes two chamber seats, which are fastened together by bolts and nuts. A first conduit groove is provided between the two chamber seats. A gas concentration monitor is installed inside the tank body and connected to a controller for overall machine control. The controller is connected to an alarm. A first valve body is fixed to the bottom of the inner tubing column and connected to a first flange outside the tank body. From top to bottom, the inner tubing column is connected to an exhaust pipe, a control pipe, and a liquid injection pipe. The liquid injection pipe is connected to a second flange outside the tank body via a first one-way valve. This industrial gas recovery device and storage system can reduce the energy consumption of vaporization equipment and fully utilize low-pressure vaporized industrial gas, reducing the total amount of vaporized industrial gas and thus reducing the energy consumption of cryogenic equipment.

Description

Technical Field

[0001] This invention specifically relates to an industrial gas recovery device and storage system, belonging to the field of industrial gas storage technology. Background Technology

[0002] Industrial gases are diverse, such as nitrogen and natural gas. After being liquefied in large-scale liquefaction equipment, they become liquefied industrial gases. These gases are typically stored in vacuum-insulated cryogenic tanks. During filling, the liquefied industrial gases are first loaded into tank trucks, which then transport them to the cryogenic storage tanks. During this process, the liquids collide with each other, causing the liquefied industrial gases to vaporize. This vaporized gas continuously accumulates within the cryogenic tank, and because the tank has slight heat leakage, liquefied natural gas evaporates, forming re-evaporated gas. The vaporized industrial gases cause the pressure inside the cryogenic storage tank to rise. To prevent the tank from rupturing, a safety vent valve opens when the pressure reaches a certain value. Releasing re-evaporated gas into the atmosphere to reduce the pressure inside the cryogenic storage tank can easily lead to energy waste and environmental pollution. To address this, Chinese Patent Publication No. CN105157345B discloses an industrial gas recovery device and storage system that can improve the safety of industrial gas storage and avoid air pollution and waste of industrial gas. However, this storage system requires condensing the vaporized industrial gas and re-pumping it back into the storage tank. It requires condensing all the discharged vaporized gas, which consumes a lot of energy. Moreover, the condensed gas still needs to be vaporized during subsequent filling, resulting in secondary energy consumption. In addition, during the process of condensing and re-pumping the industrial gas back into the storage tank, it is easy to bring outside air into the storage tank, causing contamination of the gas stored inside. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes an industrial gas recovery device and storage system that can reduce the energy consumption of vaporization equipment and fully utilize low-pressure vaporized industrial gas, thereby reducing the total amount of vaporized industrial gas and thus lowering the energy consumption of cryogenic equipment, while also ensuring good overall safety.

[0004] The industrial gas recovery device of the present invention includes: The tank body includes two chamber seats, which are fastened together by bolts and nuts. A first conduit groove is provided between the two chamber seats to facilitate the compression and sealing of the pipeline. A gas concentration monitor is installed inside the tank body and is connected to a controller for overall machine control. The controller is connected to an alarm. During operation, the two chamber seats are assembled into a closed tank body, thereby encapsulating the various components of the industrial gas recovery equipment. The gas concentration monitor monitors the industrial gas concentration inside the tank body to detect whether there is a leak at the connection of each component. When the gas concentration monitor detects that the industrial gas concentration value reaches a set value, it is determined that a leak has occurred. At this time, the controller sends an alarm signal to the alarm. An inner tubing column has a first valve body fixed at its bottom, which is connected to a first flange on the outside of the tank. From top to bottom, the inner tubing column is connected to a steam vent pipe, a control pipe, and a liquid injection pipe. The liquid injection pipe is connected to a second flange on the outside of the tank via a first check valve. The steam vent pipe is connected to the input end of a pneumatically controlled check valve, and the control pipe is connected to the control end of the pneumatically controlled check valve. A first control valve is connected in series on the control pipe. A first pressure transmitter is installed at the top inner side of the inner tubing column, and the first pressure transmitter is connected to the first control valve via... The controller is linked; when the first pressure transmitter reaches the set pressure value, the first control valve opens. At this time, the pressurized gas in the inner tube pressurizes the control end of the pneumatic check valve, and the pneumatic check valve forms a bidirectional flow state, so that the vaporized industrial gas in the inner tube is discharged through the pneumatic check valve; by setting the first control valve, and the pressure at which the first control valve is triggered is greater than the opening pressure of the pneumatic check valve, frequent opening and closing of the control end of the pneumatic check valve is prevented; until the pressure inside the inner tube is lower than the opening pressure of the pneumatic check valve, the first control valve closes again; The recovery tank has its top connected to the output end of a pneumatically controlled check valve; its bottom is connected to a third flange outside the tank body via a transition pipe; an upper valve group and a lower valve group are connected in series on the transition pipe; a heat exchange spiral tube is fixed inside the recovery tank; both ends of the heat exchange spiral tube are connected to a fourth flange and a fifth flange outside the tank body; a steam purging valve is installed at the top of the recovery tank; the steam purging valve is connected to a sixth flange outside the tank body via a steam purging pipe; the fourth flange and the fifth flange are connected in series to a refrigeration unit via a circulation pump; the vaporized industrial gas in the inner tube column is injected into the recovery tank through the pneumatically controlled check valve. At this time, according to external application requirements, the vaporized industrial gas can be sent to a storage or application unit through the steam purging valve, steam purging pipe, and the sixth flange, or the cold medium in the refrigeration unit can be circulated through the fourth flange and the fifth flange to establish circulation with the heat exchange spiral tube via the circulation pump, thereby liquefying the vaporized industrial gas inside the recovery tank, and discharging the liquefied industrial gas out of the recovery tank by alternately opening the upper and lower valve groups.

[0005] Furthermore, a vent valve is provided on the top of the tank. When the concentration (pressure) of the industrial gas inside the tank reaches a set value, the vent valve is opened to release the gas.

[0006] Furthermore, the refrigeration equipment is a liquid nitrogen cryogenic device or a compression refrigeration device; the liquid nitrogen cryogenic device or the compression refrigeration device can cryogenically cool the vaporized industrial gas, thereby liquefying the vaporized industrial gas.

[0007] Furthermore, a second check valve is connected in series between the inner tubing and the first control valve, and an external control pipe is connected in parallel between the first control valve and the second check valve. A third check valve is connected in series on the external control pipe. The external control pipe is connected to a seventh flange outside the tank. A compressor is connected in series on the purging pipe, and bypass pipes are connected in parallel at both ends of the compressor. An intermediate valve group is connected in series on the bypass pipe. The pneumatic check valve can be pressure-triggered by the pressure of the inner tubing and can also be externally triggered by the external control pipe. Thus, when the pneumatic check valve cannot be triggered by the inner tubing, it can be directly triggered externally, thereby extracting the low-pressure vaporized industrial gas from the inner tubing and pressurizing it through the compressor before sending it into the gas buffer tank.

[0008] Furthermore, the sixth flange is connected to the gas buffer tank via a fourth one-way valve; the gas buffer tank is also equipped with a second pressure transmitter, a vent valve, and a one-way inlet valve; the one-way inlet valve is connected to the vaporization equipment; the third flange is connected to the storage tank of the vaporization equipment; the input end of the storage tank is equipped with a liquid inlet pump; the vent valve is connected to the gas purifier; the gas buffer tank is connected to the seventh flange via an external start valve group; when the purging equipment needs purging, the liquefied industrial gas in the cryogenic storage tank is pumped out and sent to the vaporization equipment for vaporization, and the vaporized industrial gas is sent to the gas buffer tank for buffering via the one-way inlet valve. After purification by a gas purifier via an exhaust valve, the gas is supplied to industrial gas filling bottles. The gas buffer tank serves as a buffer tank for the steam charging equipment and also as an external pressure source for activating the pneumatically controlled check valve. The gas buffer tank maintains a set pressure range, where the lowest pressure value is greater than the control terminal activation pressure value of the pneumatically controlled check valve. When the first pressure transmitter detects that the inner tubing has reached a first pressure value, it opens the first control valve, followed by the opening of the external activation valve group. The gas buffer tank provides a pressure source to the control terminal of the pneumatically controlled check valve through the third check valve, thereby opening the pneumatically controlled check valve. The compressor then purifies the low-pressure gas in the inner tubing. The compressed gas source pressurizes and delivers it to the gas buffer tank until the pressure in the inner tubing drops to the lower limit. At this point, the external start valve group closes. When the liquefied gas in the industrial gas storage tank experiences a filling impact or external heating, causing the pressure in the inner tubing to rise linearly, the gas pressure enters the first control valve through the second check valve. At this time, the output pressure of the third check valve is greater than the input pressure, directly shutting off the third check valve. The internal pressure of the inner tubing keeps the pneumatically controlled check valve continuously open, thus sending the vaporized industrial gas from the pneumatically controlled check valve to the recovery tank. Because the vaporized industrial gas has a certain pressure, the compressor is then shut off, and the gas can be transferred through the bypass pipe and intermediate valve group. The industrial gas is charged into the gas buffer tank. When the pressure in the gas buffer tank reaches a high value, the intermediate valve group is closed and the circulation pump is turned on, thereby pumping the cold liquid in the refrigeration equipment into the heat exchange spiral tube. The cold medium in the heat exchange spiral tube condenses and reliquefies the vaporized industrial gas in the recovery tank. The condensed and liquefied industrial gas is then sent to the liquid storage tank of the vaporization equipment through the transition pipe for refrigeration, waiting for the vaporization equipment to vaporize. This prevents the condensed and liquefied gas from bringing in outside air during its return to the industrial gas storage tank. The upper and lower valve groups on the transition pipe open at different times to isolate the recovery tank and the liquid storage tank of the vaporization equipment from each other.

[0009] Furthermore, two spacers are positioned opposite each other on the inner sides of the two cavity seats, and a second conduit groove is provided on the spacer. The third, fourth, fifth, and sixth flanges are located below the spacers, and the spacers are provided with multiple connecting perforations. During installation, the spacers support the third, fourth, fifth, and sixth flanges, and simultaneously accommodate them within the tank body. The connecting perforations on the spacers allow communication between the upper and lower parts of the tank body. When a leak occurs at the connection point of the third, fourth, fifth, and sixth flanges, it can be quickly detected and alarmed by a gas concentration monitor.

[0010] An industrial gas storage system includes an industrial gas recovery device and a vacuum-insulated cryogenic storage tank. A first flange is connected to the liquid inlet flange of the cryogenic storage tank; a second flange is connected to a filling device, which is connected to a tank truck. The cryogenic storage tank uses an existing liquefied industrial gas storage tank, requiring no modification. When connecting the system, only the first flange of the industrial gas recovery device needs to be connected to the liquid inlet flange of the cryogenic storage tank, without any modification to the cryogenic storage tank, and the safety venting function of the cryogenic storage tank's safety discharge valve can be retained. The tank truck shuttles between the cryogenic storage tank and the liquefaction device, enabling the delivery of liquefied industrial gas into the cryogenic storage tank.

[0011] Compared with existing technologies, the industrial gas recovery equipment and storage system of the present invention do not require modification of the cryogenic storage tank. The industrial gas recovery equipment of the present invention can be directly assembled with the original liquid inlet of the cryogenic storage tank, while retaining the safety discharge valve of the cryogenic storage tank, thus preserving its safe venting function. Furthermore, the opening pressure of the pneumatic control check valve is set lower than the venting pressure of the safety discharge valve, thereby ensuring that the vaporized industrial gas is fully discharged and recovered before the cryogenic storage tank reaches its venting pressure. The industrial gas recovery equipment of the present invention can collect low-pressure industrial gas vapor from the cryogenic storage tank and compress it to send it to a gas buffer tank. This reduces the energy consumption of the vaporization equipment. When the gas pressure in the cryogenic storage tank rises sharply to a high-pressure value, the high-pressure industrial gas vapor is automatically pumped into the gas buffer tank using the gas pressure. When the gas buffer tank cannot absorb the excess high-pressure vapor, the circulation pump and refrigeration equipment are activated to cryogenically liquefy the excess high-pressure vapor, thereby sending the cryogenically liquefied industrial gas into the storage tank of the vaporization equipment. Subsequent vaporization operations consume the temporarily stored liquefied industrial gas in advance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the cavity seat, inner tubing, and recovery tank of the present invention.

[0013] Figure 2 This is a schematic diagram of the cavity seat, inner tubing, recovery tank, and external control pipe structure of the present invention.

[0014] Figure 3 This is a schematic diagram of one embodiment of the industrial gas recovery equipment of the present invention.

[0015] Figure 4 This is a schematic diagram of another embodiment of the industrial gas recovery equipment of the present invention.

[0016] Figure 5 This is a schematic diagram of the inner structure of the cavity seat with a spacer according to the present invention.

[0017] Reference numerals: 1. Cavity seat; 2. First conduit groove; 3. Gas concentration monitor; 4. Inner tubing; 5. First valve body; 6. First flange; 7. Exhaust pipe; 8. Control pipe; 9. Injection pipe; 10. First check valve; 11. Second flange; 12. Pneumatic check valve; 13. First control valve; 14. First pressure transmitter; 15. Recovery tank; 16. Transition pipe; 17. Third flange; 18. Upper valve assembly; 19. Lower valve assembly; 20. Heat exchange spiral tube; 21. Fourth flange; 22. Fifth flange; 23. Steam purging valve; 24. Steam purging pipe. 25. Sixth flange; 26. Circulating pump; 27. Refrigeration equipment; 28. Vent valve; 29. ​​Second check valve; 30. External control pipe; 31. Third check valve; 32. Seventh flange; 33. Compressor; 34. Bypass pipe; 35. Intermediate valve assembly; 36. Fourth check valve; 37. Gas buffer tank; 38. Second pressure transmitter; 39. Exhaust valve; 40. One-way steam inlet valve; 41. Vaporization equipment; 42. Liquid inlet pump; 43. Gas purifier; 44. External start valve assembly; 45. Spacer; 46. Second conduit groove; 47. Connecting perforation. Detailed Implementation

[0018] Example 1: like Figures 1 to 5 The industrial gas recovery equipment shown includes: The tank body includes two cavity seats 1, which are fastened together by bolts and nuts. A first conduit groove 2 is provided between the two cavity seats 1 to facilitate the compression and sealing of the pipeline. A gas concentration monitor 3 is installed inside the tank body and is connected to the controller of the whole machine. The controller is connected to an alarm. During operation, the two cavity seats 1 are assembled into a closed tank body, which can encapsulate the various components of the industrial gas recovery equipment. The gas concentration monitor 3 monitors the industrial gas concentration inside the tank body to detect whether there is a leak at the connection of each component. When the gas concentration monitor 3 detects that the industrial gas concentration value reaches the set value, it is determined that a leak has occurred. At this time, the controller sends an alarm signal to the alarm. The inner tubing column 4 has a first valve body 5 fixed at its bottom, which can be temporarily locked. The first valve body 5 is connected to a first flange 6 on the outside of the tank. From top to bottom, the inner tubing column 4 is connected to a steam vent pipe 7, a control pipe 8, and a liquid injection pipe 9. The liquid injection pipe 9 is connected to a second flange 11 on the outside of the tank via a first check valve 10. The steam vent pipe 7 is connected to the input end of a pneumatic check valve 12, and the control pipe 8 is connected to the control end of the pneumatic check valve 12. A first control valve 13 is connected in series on the control pipe 8. A first pressure transmitter 14 is installed on the top inner side of the inner tubing column 4. 4. The first control valve 13 is linked with the controller. When the first pressure transmitter 14 reaches the set pressure value, the first control valve 13 opens. At this time, the pressurized gas in the inner column 4 pressurizes the control end of the pneumatic check valve 12, and the pneumatic check valve 12 forms a bidirectional flow state, so that the vaporized industrial gas in the inner column 4 is discharged through the pneumatic check valve 12. By setting the first control valve 13, and the pressure at which the first control valve 13 is triggered is greater than the opening pressure of the pneumatic check valve 12, the control end of the pneumatic check valve 12 is prevented from frequently opening and closing. The first control valve 13 closes again when the pressure inside the inner column 4 is lower than the opening pressure of the pneumatic check valve 12. A recovery tank 15 is connected at its top to the output end of a pneumatic check valve 12. The bottom of the recovery tank 15 is connected to a third flange 17 outside the tank body via a transition pipe 16. An upper valve assembly 18 and a lower valve assembly 19 are connected in series on the transition pipe 16. A heat exchange spiral pipe 20 is fixed inside the recovery tank 15. Both ends of the heat exchange spiral pipe 20 are connected to a fourth flange 21 and a fifth flange 22 outside the tank body. A steam purging valve 23 is installed at the top of the recovery tank 15. The steam purging valve 23 is connected to a sixth flange 25 outside the tank body via a steam purging pipe 24. The fourth flange 21 and the fifth flange 22 are connected via… The circulating pump 26 is connected in series with the refrigeration equipment 27; the vaporized industrial gas in the inner tube column 4 is pumped into the recovery tank 15 through the pneumatic control check valve 12. At this time, according to the external application requirements, the vaporized industrial gas can be sent to the storage or application unit through the steam valve 23, steam pipe 24 and sixth flange 25, or the cold medium in the refrigeration equipment 27 can be circulated with the heat exchange spiral tube 20 through the fourth flange 21 and fifth flange 22 by the circulating pump 26, so that the vaporized industrial gas inside the recovery tank 15 can be liquefied, and the liquefied industrial gas can be discharged out of the recovery tank 15 by alternately opening the upper valve group 18 and the lower valve group 19.

[0019] The top of the tank is equipped with a vent valve 28. When the concentration (pressure) of the industrial gas inside the tank reaches a set value, the vent valve 28 is opened to release the gas.

[0020] The refrigeration equipment 27 is a liquid nitrogen cryogenic equipment or a compression refrigeration equipment 27; the liquid nitrogen cryogenic equipment or the compression refrigeration equipment 27 can cryogenically cool vaporized industrial gas, thereby liquefying the vaporized industrial gas.

[0021] A second check valve 29 is connected in series between the inner tubing 4 and the first control valve 13. An external control pipe 30 is connected in parallel between the first control valve 13 and the second check valve 29. A third check valve 31 is connected in series on the external control pipe 30. The external control pipe 30 is connected to the seventh flange 32 outside the tank. A compressor 33 is connected in series on the steam injection pipe 24. A bypass pipe 34 is connected in parallel at both ends of the steam injection pipe 24 and an intermediate valve group 35 is connected in series on the bypass pipe 34. The pneumatic check valve 12 can be pressure-triggered by the pressure of the inner tubing 4 and can also be externally triggered by the external control pipe 30. Thus, when the pneumatic check valve 12 cannot be triggered by the inner tubing 4, it can be directly triggered externally, thereby extracting the low-pressure vaporized industrial gas from the inner tubing 4 and pressurizing it through the compressor 33 before sending it into the gas buffer tank.

[0022] The sixth flange 25 is connected to the gas buffer tank 37 via the fourth one-way valve 36; the gas buffer tank 37 is also equipped with a second pressure transmitter 38, a steam exhaust valve 39, and a one-way steam inlet valve 40; the one-way steam inlet valve 40 is connected to the vaporization device 41; the third flange 17 is connected to the liquid storage tank of the vaporization device 41; the liquid storage tank is equipped with a liquid inlet pump 42 at its input end; the steam exhaust valve 39 is connected to the gas purifier 43; the gas buffer tank 37 is connected to the seventh flange 32 via an external start valve group 44; when the steam purging device needs to be purged, the liquefied industrial gas in the cryogenic storage tank is pumped out and sent to the vaporization device 41 for vaporization, and the vaporized industrial gas is sent to the gas buffer tank 37 via the one-way steam inlet valve 40. 7. After being buffered and purified by the gas purifier 43 via the exhaust valve 39, the gas is supplied to the industrial gas filling bottles. The gas buffer tank 37 serves as the buffer tank for the steam charging equipment and also as the external pressure source for the activation of the pneumatic check valve 12. The gas buffer tank 37 maintains a set pressure range, the lowest pressure value of which is greater than the control terminal activation pressure value of the pneumatic check valve 12. When the first pressure transmitter 14 detects that the inner tube 4 has reached the first pressure value, it opens the first control valve 13, and then opens the external activation valve group 44. The gas buffer tank 37 provides a pressure source to the control terminal of the pneumatic check valve 12 through the third check valve 31, thereby opening the pneumatic check valve 12. The compressor 33 then supplies the gas to the inner tube 4. The low-pressure gas source inside the tank is pressurized and sent to the gas buffer tank 37. When the pressure in the inner tube column 4 drops to the lower limit, the external start valve group 44 closes. When the liquefied gas in the industrial gas storage tank experiences a filling impact or external heating, causing the pressure inside the inner tube column 4 to rise linearly, the gas pressure enters the first control valve 13 through the second one-way valve 29. At this time, the output pressure of the third one-way valve 31 is greater than the input pressure, which can directly shut off the third one-way valve 31. The internal pressure of the inner tube column 4 is used to keep the pneumatic control one-way valve 12 continuously open, thereby sending the vaporized industrial gas from the pneumatic control one-way valve 12 to the recovery tank 15. Since the vaporized industrial gas has a certain pressure, at this time, the compressor 33 is turned off, and the vaporized gas can be sent through the bypass pipe 34 and the intermediate valve group 35. Industrial gas is introduced into gas buffer tank 37. When the pressure in gas buffer tank 37 reaches a high value, intermediate valve group 35 is closed and circulation pump 26 is turned on, thereby pumping the cold liquid in refrigeration equipment 27 into heat exchange spiral tube 20. The cold medium in heat exchange spiral tube 20 condenses and reliquefies the vaporized industrial gas in recovery tank 15, and sends the condensed and liquefied industrial gas through transition pipe 16 into the storage tank of vaporization equipment 41 for refrigeration, waiting for vaporization equipment 41 to vaporize, so as to avoid the introduction of external air during the process of condensed and liquefied gas returning to industrial gas storage tank. The upper valve group 18 and lower valve group 19 on transition pipe 16 open at different times to isolate recovery tank 15 and storage tank of vaporization equipment 41 from each other.

[0023] Two cavity seats 1 are provided with spacers 45 facing each other on their inner sides. The spacers 45 are provided with second conduit grooves 46. The third flange 17, fourth flange 21, fifth flange 22 and sixth flange 25 are provided below the spacers 45. The spacers 45 are provided with multiple through holes 47. During installation, the spacers 45 support the third flange 17, fourth flange 21, fifth flange 22 and sixth flange 25. At the same time, the spacers 45 can accommodate the third flange 17, fourth flange 21, fifth flange 22 and sixth flange 25 in the tank body. The through holes 47 on the spacers 45 can connect the upper and lower parts of the inner side of the tank body. When a leak occurs at the connection of the third flange 17, fourth flange 21, fifth flange 22 and sixth flange 25, it can be quickly detected and alarmed by the gas concentration monitor 3.

[0024] An industrial gas storage system includes an industrial gas recovery device and a vacuum-insulated cryogenic storage tank. A first flange 6 is connected to the liquid inlet flange of the cryogenic storage tank; a second flange 11 is connected to a filling device, which is connected to a tank truck. The cryogenic storage tank uses an existing liquefied industrial gas storage tank, requiring no modification. When connecting the system, only the first flange 6 of the industrial gas recovery device needs to be connected to the liquid inlet flange of the cryogenic storage tank, without requiring any modification to the cryogenic storage tank, and the safety venting function of the cryogenic storage tank's safety discharge valve can be retained. The tank truck shuttles between the cryogenic storage tank and the liquefaction device, enabling the delivery of liquefied industrial gas into the cryogenic storage tank.

[0025] The above embodiments are merely preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention are included within the scope of the present invention.

Claims

1. An industrial gas recovery device, characterized in that: include: The tank body includes two chamber seats, which are fastened together by bolts and nuts; a first conduit groove is provided between the two chamber seats; a gas concentration monitor is installed inside the tank body, which is connected to the controller of the whole machine, and the controller is connected to an alarm. An inner tubing column has a first valve body fixed at its bottom, which is connected to a first flange on the outside of the tank. From top to bottom, the inner tubing column is connected to a steam vent pipe, a control pipe, and a liquid injection pipe. The liquid injection pipe is connected to a second flange on the outside of the tank via a first check valve. The steam vent pipe is connected to the input end of a pneumatically controlled check valve, and the control pipe is connected to the control end of the pneumatically controlled check valve. A first control valve is connected in series on the control pipe. A first pressure transmitter is installed at the top of the inner side of the inner tubing column, and the first pressure transmitter and the first control valve are linked via a controller. The recovery tank has its top connected to the output end of a pneumatically controlled one-way valve; its bottom is connected to a third flange outside the tank body via a transition pipe; an upper valve group and a lower valve group are connected in series on the transition pipe; a heat exchange spiral tube is fixed inside the recovery tank; both ends of the heat exchange spiral tube are connected to a fourth flange and a fifth flange outside the tank body; a steam purging valve is installed at the top of the recovery tank; the steam purging valve is connected to a sixth flange outside the tank body via a steam purging pipe; the fourth flange and the fifth flange are connected in series to a refrigeration unit via a circulating pump. A second check valve is connected in series between the inner tube and the first control valve. An external control pipe is connected in parallel between the first control valve and the second check valve. A third check valve is connected in series on the external control pipe. The external control pipe is connected to a seventh flange outside the tank. A compressor is connected in series on the steam injection pipe. A bypass pipe is connected in parallel at both ends of the steam injection pipe. An intermediate valve group is connected in series on the bypass pipe.

2. The industrial gas recovery equipment according to claim 1, characterized in that: A vent valve is installed on the top of the tank.

3. The industrial gas recovery equipment according to claim 1, characterized in that: The refrigeration equipment is a liquid nitrogen cryogenic device or a compression refrigeration device.

4. The industrial gas recovery equipment according to claim 1, characterized in that: The sixth flange is connected to the gas buffer tank via the fourth check valve; the gas buffer tank is also equipped with a second pressure transmitter, a vent valve, and a one-way steam inlet valve; the one-way steam inlet valve is connected to the vaporization equipment; the third flange is connected to the liquid storage tank of the vaporization equipment; the liquid storage tank is equipped with a liquid inlet pump at its input end; the vent valve is connected to the gas purifier; the gas buffer tank is connected to the seventh flange via an external start valve group; the gas buffer tank serves as the buffer tank for the steam charging equipment and also as an external pressure source for starting the pneumatically controlled check valve; the gas buffer tank maintains... A defined pressure range is established, where the lowest pressure value of the pressure range is greater than the starting pressure value of the control terminal of the pneumatic check valve. When the first pressure transmitter detects that the inner tubing has reached the first pressure value, it opens the first control valve, followed by the opening of the external start valve group. The gas buffer tank provides a pressurized gas source to the control terminal of the pneumatic check valve through the third check valve, thereby opening the pneumatic check valve. The compressor pressurizes the low-pressure gas source in the inner tubing and sends it to the gas buffer tank until the pressure in the inner tubing drops to the lower limit value. At this point, the external start valve group closes. When the liquefied gas in the industrial gas storage tank is being filled... When an impact or external heating causes a linear increase in pressure within the inner tubing, the gas pressure enters the first control valve through the second check valve. At this time, the output pressure of the third check valve is greater than the input pressure, which can directly shut off the third check valve. The internal pressure of the inner tubing keeps the pneumatically controlled check valve continuously open, thus sending the vaporized industrial gas from the pneumatically controlled check valve to the recovery tank. Since the vaporized industrial gas has a certain pressure, the compressor is turned off, and the vaporized industrial gas can be charged into the gas buffer tank through the bypass pipe and intermediate valve group. When the pressure in the gas buffer tank reaches... At high values, the intermediate valve group is closed and the circulation pump is turned on, thereby pumping the refrigerant in the refrigeration equipment into the heat exchange spiral tube. The cold medium in the heat exchange spiral tube condenses and reliquefies the vaporized industrial gas in the recovery tank. The condensed and liquefied industrial gas is then sent through the transition pipe to the liquid storage tank of the vaporization equipment for refrigeration, waiting for the vaporization equipment to vaporize. This prevents the condensed and liquefied gas from carrying in outside air during its return to the industrial gas storage tank. The upper and lower valve groups on the transition pipe open at different times to isolate the recovery tank and the liquid storage tank of the vaporization equipment from each other.

5. The industrial gas recovery equipment according to claim 1, characterized in that: Two spacers are arranged opposite each other on the inner sides of the cavity seats, and a second guide groove is provided on the spacer; the third flange, fourth flange, fifth flange and sixth flange are arranged below the spacer, and a plurality of through holes are provided on the spacer.

6. An industrial gas storage system, comprising the industrial gas recovery device of claim 1, characterized in that: It also includes a vacuum-insulated cryogenic storage tank, with the first flange connected to the liquid inlet flange of the cryogenic storage tank; and the second flange connected to a filling device, which is connected to a tank truck.

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