Low-temperature liquid argon storage tank pipeline for recycling emptying argon

Abstract

The utility model belongs to the technical field of low-temperature liquid argon storage tanks in air substation areas, and relates to a low-temperature liquid argon storage tank pipeline for recovering and reusing emptying argon, which comprises a storage tank, an emptying pipe is arranged at the top of the storage tank, a pressure instrument is arranged on the emptying pipe, an emptying valve A is arranged at the tail end of the emptying pipe, and a connecting pipe is led out of the emptying pipe. An emptying valve B and an emptying valve C are arranged on the connecting pipe, a back connecting pipe is led out of the connecting pipe, an inlet valve, a heat exchanger A, a thermometer, a piston pump, a check valve and a grid connection valve are sequentially arranged on the back connecting pipe, the back connecting pipe is connected to an external supply pipe, and the external supply pipe is connected to the bottom of the storage tank. And an inlet valve, a low-temperature pump, a pump check valve, a pump outlet valve, a heat exchanger B, a spherical tank and an external supply pressure regulating valve are sequentially arranged on the external supply pipe. According to the device, high-added-value argon naturally evaporated in the normal-pressure powder heat insulation low-temperature liquid argon storage tank is recycled, and economic benefits are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-temperature liquid argon storage tanks in air separation stations, and in particular relates to a low-temperature liquid argon storage tank pipeline for venting argon gas for recovery and reuse. Background Art

[0002] The atmospheric pressure powder insulation type low-temperature liquid argon storage tank is mainly used to store the liquid argon products produced by the oxygen concentrator in the station area. The storage tank is mainly composed of two layers of stainless steel cylinders, the inner and outer layers, and the middle of the two layers is filled with pearl sand insulation materials with low thermal conductivity. The liquid argon produced by the oxygen concentrator is a high value-added by-product, stored in the storage tank at atmospheric pressure and -186℃, and is mainly used for gasification to supply argon gas to users outside. At the same time, the surplus products are exported to generate income. A vent valve is set at the top of the storage tank, which is mainly used to discharge the naturally vaporized and evaporated argon gas in the storage tank into the atmosphere, keeping the internal pressure of the atmospheric pressure storage tank in the safe range of 10-15kpa.

[0003] The following problems exist in actual use:

[0004] 1. The high value-added argon product is discharged, and while the pressure inside the storage tank is maintained stable, it is not recycled, resulting in waste and loss.

[0005] 2. The argon gas supplied to users is reheated from the liquid argon product and then gasified. The surplus liquid argon product for export is relatively reduced, and the revenue generated by export is reduced.

[0006] Therefore, a cryogenic liquid argon storage tank pipeline for recovering and reusing vented argon is proposed. Utility Model Content

[0007] The utility model aims to provide a low-temperature liquid argon storage tank pipeline for recovering and reusing vented argon gas, which has the function of recovering and reusing vented argon gas, and solves the problem of the prior art that high value-added argon gas products are discharged but not recovered, resulting in waste and loss, and reduced revenue.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the utility model provides a low-temperature liquid argon storage tank pipeline for venting argon gas for recovery and reuse, including a storage tank, a vent pipe is arranged on the top of the storage tank, a pressure instrument is arranged on the vent pipe, a vent valve A is arranged at the end of the vent pipe, a connecting pipe is led out from the vent pipe, a vent valve B and a vent valve C are arranged on the connecting pipe, a return pipe is led out from the connecting pipe, an inlet valve, a heat exchanger A, a thermometer, a piston pump, a check valve and a grid connection valve are arranged on the return pipe in sequence, the return pipe is connected to an external supply pipe, the external supply pipe is connected to the bottom of the storage tank, and an inlet valve, a low-temperature pump, a pump check valve, a pump outlet valve, a heat exchanger B, a spherical tank and an external supply pressure regulating valve are arranged on the external supply pipe in sequence.

[0009] Preferably, an argon inlet pipe is provided on one side of the storage tank, and an argon inlet valve is provided on the argon inlet pipe.

[0010] Preferably, the connection pipe is led out on the vent pipe at a position in front of the pressure instrument.

[0011] Preferably, the return pipe is led out on the connecting pipe at a position between the vent valve B and the vent valve C.

[0012] Preferably, an analysis tube is led out from the return pipe, the leading position of the analysis tube on the return pipe is located between the check valve and the grid-connected valve, and an analysis valve is provided on the analysis tube.

[0013] Preferably, the return pipe is connected to the external supply pipe position between the heat exchanger B and the spherical tank.

[0014] Compared with the prior art, the advantages and positive effects of the utility model are:

[0015] 1. The utility model realizes the recycling of high value-added argon gas naturally evaporated in the atmospheric pressure powder insulation low-temperature liquid argon storage tank, thereby improving economic benefits;

[0016] 2. The utility model has the function of releasing argon gas for recovery and reuse, which solves the problem in the prior art that high value-added argon gas products are discharged but not recovered, resulting in waste and loss and reduced revenue. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0018] Figure 1 It is a structural schematic diagram of a cryogenic liquid argon storage tank pipeline for recovering and reusing vented argon gas;

[0019] In the above figure, 1, storage tank, 2, argon inlet pipe, 3, argon inlet valve, 4, vent pipe, 5, pressure instrument, 6, vent valve A, 7, connecting pipe, 8, vent valve B, 9, vent valve C, 10, return pipe, 11, inlet valve, 12, heat exchanger A, 13, thermometer, 14, piston pump, 15, check valve, 16, grid connection valve, 17, analysis pipe, 18, analysis valve, 19, external supply pipe, 20, spherical tank, 21, external supply pressure regulating valve, 22, heat exchanger B, 23, pump outlet valve, 24, pump check valve, 25, cryogenic pump, 26, inlet valve. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0022] Embodiment 1, as Figure 1 As shown, a pipeline of a cryogenic liquid argon storage tank 1 for venting argon gas for recycling includes a storage tank 1, which is used to store liquid argon products, and adopts a normal pressure powder insulation design, with two layers of stainless steel inside and outside, and a pearl sand insulation material with a low thermal conductivity coefficient filled in the middle to keep the liquid argon from being easily vaporized at a stable temperature. A vent pipe 4 is provided on the top of the storage tank 1, and the vent pipe 4 is used to discharge the accumulated argon gas in the storage tank 1 into the atmosphere to keep the internal pressure of the storage tank 1 stable. A pressure meter 5 is provided on the vent pipe 4, and the pressure meter 5 is used to monitor and display the pressure in the storage tank 1 to ensure that the pressure is within a safe range.

[0023] A vent valve A6 is provided at the end of the vent pipe 4, and the vent valve A6 is used to control the discharge amount of argon in the vent pipe 4 to avoid waste of resources caused by excessive discharge. A connecting pipe 7 is led out from the vent pipe 4, and a vent valve B8 and a vent valve C9 are provided on the connecting pipe 7. The vent valve B8 and the vent valve C9 are used to control the flow direction of argon in the vent pipe 4 and the connecting pipe 7 respectively. A return pipe 10 is led out from the connecting pipe 7, and the connecting pipe 7 connects the vent pipe 4 with the return pipe 10, and the return pipe 10 is connected to the external supply pipe 19 to realize the recovery and reuse of argon.

[0024] The return pipe 10 is provided with an inlet valve 11, a heat exchanger A12, a thermometer 13, a piston pump 14, a check valve 15 and a grid-connected valve 16 in sequence. The inlet valve 11 is used to control the flow rate and pressure of argon gas entering the external supply pipe 19 from the return pipe 10 to ensure a stable and reliable supply of argon gas. The heat exchanger A12 performs heat exchange treatment on the recovered liquid argon gas. The thermometer 13 monitors the temperature of the argon gas and can detect the heat exchange effect. The piston pump 14 is used to compress the argon gas to improve the transportation efficiency and flow rate of the argon gas. The check valve 15 prevents the argon gas from flowing back during the transportation process to ensure that the argon gas flows correctly and does not flow back. The grid-connected valve 16 is used to control the connection between the return pipe 10 and the external supply pipe 19 to achieve smooth transportation and supply of argon gas.

[0025] The external supply pipe 19 is connected to the bottom of the storage tank 1. The external supply pipe 19 is used to supply the argon in the storage tank 1 to the user, so as to realize the external delivery of the argon product. The external supply pipe 19 is provided with an inlet valve 26, a cryogenic pump 25, a pump check valve 24, a pump outlet valve 23, a heat exchanger B22, a spherical tank 20 and an external supply pressure regulating valve 21 in sequence. The inlet valve 26 is used to control the flow and pressure of the argon entering the external supply pipe 19 from the storage tank 1 to ensure the stability and safety of the argon supply. The cryogenic pump 25 is used to suck and push the argon to improve the delivery efficiency and flow of the argon. The pump check valve 24 is used to prevent the argon from flowing back and protect the pump equipment and pipeline safety. The pump outlet valve 23 is used to control the flow and pressure of the argon flowing out of the cryogenic pump 25 to the external supply pipe 19 to ensure that the supply of argon meets the demand. The heat exchanger B22 is used to perform heat exchange treatment on the argon to ensure that the argon maintains a suitable temperature state during the external supply process. The spherical tank 20 is used to store externally supplied argon gas to ensure a stable amount of argon gas provided to users and avoid interruption of gas supply. The externally supplied pressure regulating valve 21 is used to adjust the pressure of the externally supplied argon gas to ensure safety and stability when supplying argon gas to users.

[0026] The following is a detailed description of the design of the above key components:

[0027] An argon inlet pipe 2 is provided on one side of the storage tank 1. The argon inlet pipe 2 is designed to facilitate the replenishment of argon gas into the storage tank 1. An argon inlet valve 3 is provided on the argon inlet pipe 2. The argon inlet valve 3 is used to control the inflow and pressure of argon gas to ensure that the argon gas in the storage tank 1 remains in a stable state.

[0028] The connecting pipe 7 is led out from the vent pipe 4 in front of the pressure instrument 5, which is conducive to conveniently monitoring and adjusting the discharge amount of argon in the vent pipe 4, so that the operator can more conveniently observe and control the argon venting process and ensure that the internal pressure of the storage tank 1 is within a safe range.

[0029] The lead-out position of the return pipe 10 on the connecting pipe 7 is located between the vent valve B8 and the vent valve C9, and coordinated regulation is achieved through the cooperation among the vent valve A6, the vent valve B8 and the vent valve C9. The vent valve A6 is opened and the vent valve B8 is closed, and the argon is discharged through the vent pipe 4. The vent valve A6 is closed, the vent valve B8 is opened, and the vent valve C9 is closed, and the argon enters the return pipe 10. The vent valve A6 is closed, the vent valve B8 is opened, and the vent valve C9 is opened, and the excess argon is discharged from the end of the connecting pipe 7.

[0030] An analysis tube 17 is led out from the return pipe 10. The leading position of the analysis tube 17 on the return pipe 10 is located between the check valve 15 and the grid-connected valve 16. Closing the grid-connected valve 16 can facilitate the argon gas to be led out of the analysis tube 17. The analysis tube 17 is designed to monitor and ensure that the quality and composition of the argon gas in the storage tank 1 meet the requirements. An analysis valve 18 is provided on the analysis tube 17, and the analysis valve 18 regulates the opening and closing of the analysis tube 17.

[0031] The return pipe 10 is connected to the external supply pipe 19 and is located between the heat exchanger B22 and the spherical tank 20. The argon gas recovered by the return pipe 10 can be sent to the spherical tank 20 for temporary storage, so as to facilitate external supply.

[0032] Example 2, a cryogenic liquid argon storage tank pipeline for recovering and reusing vented argon as described in Example 1, its working method is as follows:

[0033] 1. Control of the pressure in the storage tank 1: In the argon recovery process, vent valve A6, vent valve B8 and vent valve C9 are designed. The three vent valves participate in the control together to control the pressure in the storage tank 1 within the control range of 10-15kpa. Among them, the control target of vent valve C9 is set to 13kpa, which is the main pressure regulating valve; the control target of vent valve A6 is set to 14kpa, which is auxiliary.

[0034] 2. Safety control of the pressure in the storage tank 1: The vent valve B8, piston pump 14 and pressure instrument 5 are designed with interlock protection. Under normal circumstances, the vent valve B8 remains fully open. When the pressure in the storage tank 1 is lower than 3kpa, the vent valve B8 is automatically fully closed, and the piston pump 14 is interlocked and shut down. The interlock design is mainly to prevent the abnormal situation of too low pressure in the atmospheric pressure storage tank 1. In addition, the design of the interlock to stop the operation of the piston pump 14 when the pressure in the storage tank 1 is too low can avoid the piston pump 14 from inhaling air and causing the purity of the argon product to be contaminated.

[0035] 3. Inlet temperature protection of normal temperature argon piston pump 14: A thermometer 13 is installed on the return pipe 10 where the piston pump 14 is located. The thermometer 13 has the function of transmitting the temperature remotely to the DCS control system. In terms of interlock protection, it is designed that when the temperature measured by the thermometer 13 is lower than -20℃, the DCS control system will interlock and shut down the piston pump 14.

[0036] 4. Quality control of recovered argon: An analysis tube 17 is introduced at a position near the grid-connected valve 16 to manage the quality of recovered argon. During the initial operation, the inlet valve 11 on the return pipe 10 is opened, the grid-connected valve 16 is closed, and the analysis valve 18 is open. At this time, the piston pump 14 is manually controlled to operate at a small load, and the argon is temporarily discharged and replaced through the analysis tube 17. The sample gas is introduced into the chromatographic analyzer at the rear end of the analysis tube 17. After the analysis is qualified, the grid-connected valve 16 is opened and the analysis valve 18 is closed.

[0037] 5. Operation control of piston pump 14: The motor of piston pump 14 is controlled by a frequency converter, the target is the pressure in storage tank 1, and the frequency conversion control setting value is 12kpa. When the pressure measurement data in storage tank 1 decreases, the frequency conversion output decreases synchronously until the frequency conversion reaches zero. On the contrary, if it increases, the motor frequency conversion continues to increase to the maximum load. If the pressure in storage tank 1 continues to rise to more than 13kpa, the vent valve C9 intervenes to keep the pressure in storage tank 1 stable.

[0038] 6. Daily production organization: During normal operation, keep the piston pump 14 running. After the liquid argon evaporates naturally, it is sucked into the piston pump 14, and after the pressure is increased to 1.6-2.0MPa, it is merged into the spherical tank 20. At this time, the vent valve C9 automatically adjusts the valve opening according to the pressure change to keep the pressure in the storage tank 1 within the target control range of 13kpa; when the user's argon demand increases, start the cryogenic pump 25 to increase the pressure of the liquid argon byproduct and merge it into the spherical tank 20 after heat exchange and gasification.

[0039] 7. Argon gas is supplied to users: The external supply pressure regulating valve 21 sets the control target at 1.6MPa, and automatically adjusts and maintains the external supply pressure stable according to the user's usage.

[0040] The standard parts used in the utility model can all be purchased from the market, special-shaped parts can be customized according to the description in the specification and the drawings, the specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art, the machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0041] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A cryogenic liquid argon storage tank pipeline for venting argon gas for recovery and reuse, characterized in that: The invention comprises a storage tank, wherein a vent pipe is arranged on the top of the storage tank, a pressure instrument is arranged on the vent pipe, a vent valve A is arranged at the end of the vent pipe, a connecting pipe is led out from the vent pipe, a vent valve B and a vent valve C are arranged on the connecting pipe, a return pipe is led out from the connecting pipe, an inlet valve, a heat exchanger A, a thermometer, a piston pump, a check valve and a grid connection valve are arranged on the return pipe in sequence, the return pipe is connected to an external supply pipe, the external supply pipe is connected to the bottom of the storage tank, and an inlet valve, a low-temperature pump, a pump check valve, a pump outlet valve, a heat exchanger B, a spherical tank and an external supply pressure regulating valve are arranged on the external supply pipe in sequence.

2. The cryogenic liquid argon storage tank pipeline for recovering and reusing vented argon according to claim 1, characterized in that: An argon inlet pipe is arranged on one side of the storage tank, and an argon inlet valve is arranged on the argon inlet pipe.

3. The cryogenic liquid argon storage tank pipeline for recovering and reusing vented argon according to claim 1, characterized in that: The connecting pipe is led out on the vent pipe at the front side of the pressure instrument.

4. The cryogenic liquid argon storage tank pipeline for recovering and reusing vented argon according to claim 1, characterized in that: The return pipe is led out on the connecting pipe at a position between the vent valve B and the vent valve C.

5. The cryogenic liquid argon storage tank pipeline for recovering and reusing vented argon according to claim 1, characterized in that: An analysis pipe is led out from the return pipe, and the leading position of the analysis pipe on the return pipe is located between the check valve and the grid-connected valve, and an analysis valve is arranged on the analysis pipe.

6. The cryogenic liquid argon storage tank pipeline for recovering and reusing vented argon according to claim 1, characterized in that: The return pipe is connected to the external supply pipe position and is located between the heat exchanger B and the spherical tank.

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