Argon gas recovery device and working method thereof

Abstract

The present application discloses an argon recovery device and a working method thereof, wherein the argon recovery device includes a decarbonization unit, a deoxygenation unit and an argon extraction unit. The decarbonization unit includes two decarbonization purifiers, the decarbonization purifiers are used to adsorb carbon dioxide gas, and one decarbonization purifier is in adsorption while the other is regenerating. The deoxygenation unit includes a deoxygenation reactor and two deoxygenation purifiers, the deoxygenation reactor is connected to the two decarbonization purifiers through a pipeline, the deoxygenation reactor is connected to the two deoxygenation purifiers through a pipeline, the deoxygenation purifier is used to adsorb water vapor, and one deoxygenation purifier is in adsorption while the other is regenerating. The present invention uses the recovered product argon as the regeneration gas of the decarbonization purifier, thereby eliminating the air compressor, thereby reducing the energy consumption of the present invention, and at the same time, argon as the regeneration gas can reduce the amount of oxygen introduced from the outside, thereby reducing the amount of hydrogen used and improving the argon recovery efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of argon recovery, and in particular to an argon recovery device and a working method thereof. Background Art

[0002] Argon is an inert gas and is often used as a protective gas in industrial production.

[0003] The raw gas recovered from the single crystal furnace contains argon, nitrogen, solid particles, carbon dioxide and oxygen / carbon monoxide. The existing argon recovery device is equipped with a decarbonization purifier for decarbonization, so that the decarbonization purifier adsorbs the carbon dioxide in the raw gas. The existing argon recovery device is also equipped with an air compressor to blow air into the saturated decarbonization purifier to regenerate the decarbonization purifier. The operation of the air compressor increases the energy consumption of the existing argon recovery device. At the same time, the use of air as the regeneration gas will cause a large amount of oxygen to remain in the decarbonization purifier after the adsorption function is restored, resulting in the need to add a large amount of hydrogen during subsequent deoxygenation. Due to the excessive amount of hydrogen introduced, the gas processing capacity of the argon recovery device is increased, thereby reducing the processing capacity of the raw gas, resulting in a decrease in the processing efficiency of the argon recovery device for the raw gas. Summary of the invention

[0004] In order to solve the above technical problems and achieve at least one advantage of the present invention, the present invention provides an argon recovery device, the argon recovery device comprising:

[0005] A decarbonization unit, wherein the decarbonization unit comprises two decarbonization purifiers, wherein the decarbonization purifiers are used to adsorb carbon dioxide gas, wherein one of the decarbonization purifiers is in the adsorption state and the other is in the regeneration state, wherein a mixture of argon, carbon dioxide gas, nitrogen and oxygen enters the decarbonization purifier in the adsorption state through a pipeline;

[0006] A deoxygenation unit, the deoxygenation unit comprises a deoxygenation reactor and two deoxygenation purifiers, the deoxygenation reactor is connected to the two decarbonation purifiers through a pipeline, the deoxygenation reactor is connected to the two deoxygenation purifiers through a pipeline, the deoxygenation purifier is used to adsorb water vapor, one of the deoxygenation purifiers is in adsorption, and the other is in regeneration, the deoxygenation reactor allows hydrogen to be introduced, the mixture of argon, oxygen, and nitrogen discharged from the decarbonation purifier in the adsorption state enters the deoxygenation reactor through a pipeline, and the mixture of hydrogen, water vapor, argon, and nitrogen discharged from the deoxygenation reactor is introduced into the deoxygenation purifier in the adsorption state through a pipeline;

[0007] An argon extraction unit, the argon extraction unit comprising:

[0008] A separation device, the separation device is connected to the two deoxygenation purifiers through a pipeline, and a mixture of argon, nitrogen and hydrogen discharged from the deoxygenation purifier in an adsorption state enters the separation device through a pipeline, and the separation device separates the mixture. The separation device is connected to the two deoxygenation purifiers and the two decarbonation purifiers through a pipeline, and the product argon obtained by the separation device enters the deoxygenation purifier in a regeneration state and the decarbonation purifier in a regeneration state through a pipeline;

[0009] A heat exchange device, the heat exchange device includes two heat exchanger bodies and a tube group, one of the heat exchanger bodies is thawed and the other is frozen, each of the heat exchanger bodies forms a first refrigerant inlet and a first refrigerant outlet, the tube group includes two input pipes, two output pipes, two heat medium inlet pipes and two heat medium outlet pipes, one of the input pipes, one of the output pipes, one of the heat medium inlet pipes and one of the heat medium outlet pipes are all connected to one of the heat exchanger bodies, the separation device is connected to the first refrigerant inlet formed by each of the two heat exchanger bodies through a pipeline, the two deoxygenation purifiers and the two decarbonization purifiers are connected to the two input pipes through a pipeline, the first refrigerant outlet formed by any of the heat exchanger bodies is connected to the heat medium inlet pipe connected to the other heat exchanger body through a pipeline, The crude argon gas separated by the separation equipment enters the heat exchanger body in a frozen state through the first refrigerant inlet, the deoxygenation purifier in the regenerated state discharges a mixture six consisting of argon and water vapor, and the decarbonization purifier in the regenerated state discharges a mixture three consisting of argon and carbon dioxide from the input pipe into the heat exchanger body in a frozen state, and the argon in the mixture three and the mixture six are discharged from the output pipe connected to the heat exchanger body in a frozen state. After heat exchange, the crude argon gas enters the heat exchanger body in a thawed state from the first refrigerant outlet formed by the heat exchanger body in a frozen state through the pipeline from the heat medium inlet pipe, and the thawed carbon dioxide and water are discharged from the heat medium outlet pipe along with the crude argon gas.

[0010] According to one embodiment of the present invention, the argon recovery device includes a pretreatment unit, and the pretreatment unit includes a carbon monoxide reactor. The carbon monoxide reactor is connected to the two decarbonization purifiers through a pipeline. The carbon monoxide reactor allows clean air to enter, and the mixture discharged from the carbon monoxide reactor enters the decarbonization purifier in an adsorption state through a pipeline.

[0011] According to an embodiment of the present invention, the pretreatment unit further comprises a dust collector, which is connected to the carbon monoxide reactor through a pipeline, and is used to remove solid particulate matter.

[0012] According to one embodiment of the present invention, the heat exchange device also includes a heater, which is installed on a pipeline connecting the first refrigerant outlet and the heat medium inlet pipe, and is used to heat the crude argon gas discharged from the first refrigerant outlet formed by the heat exchanger body in a frozen state.

[0013] According to one embodiment of the present invention, the separation equipment includes an auxiliary heat exchanger and a distillation tower group, the distillation tower group separates the mixture five by low-temperature distillation, the distillation tower group is connected to the first refrigerant inlet through a pipeline, the auxiliary heat exchanger forms a second refrigerant inlet, a second refrigerant outlet, a second inlet and a second outlet, the second inlet formed by the auxiliary heat exchanger is connected to the two deoxygenation purifiers through a pipeline, the second refrigerant inlet and the second outlet formed by the auxiliary heat exchanger are both connected to the distillation tower group through a pipeline, the second refrigerant outlet formed by the auxiliary heat exchanger is connected to the two decarbonization purifiers and the two deoxygenation purifiers through a pipeline, the product argon gas discharged from the distillation tower group enters the auxiliary heat exchanger from the second refrigerant inlet, is discharged from the deoxygenation purifier in an adsorption state and enters the auxiliary heat exchanger through the second inlet, the product argon gas after heat exchange is discharged from the second refrigerant outlet, and the mixture five is injected into the distillation tower group from the second outlet.

[0014] According to one embodiment of the present invention, the auxiliary heat exchanger also forms a hydrogen inlet and a hydrogen outlet. The hydrogen inlet formed by the auxiliary heat exchanger is connected to the distillation tower group through a pipeline, and the hydrogen outlet formed by the auxiliary heat exchanger is connected to the deoxygenation reactor through a pipeline. The hydrogen discharged from the distillation tower group enters the auxiliary heat exchanger from the hydrogen inlet through the pipeline, and the heated hydrogen enters the deoxygenation reactor from the hydrogen outlet.

[0015] According to one embodiment of the present invention, the auxiliary heat exchanger also forms a reheating inlet and a reheating outlet. The reheating inlet formed by the auxiliary heat exchanger is connected to the output pipes connected to the two heat exchanger bodies through a pipeline. The argon gas discharged from the output pipes connected to the heat exchange device in a thawing state enters the auxiliary heat exchanger through the reheating inlet and is discharged from the reheating outlet. The reheating outlet is connected to the pretreatment unit through a pipeline.

[0016] According to one embodiment of the present invention, each of the heat exchanger bodies also forms a refrigerant replenishment inlet and a refrigerant replenishment outlet, and the refrigerant replenishment inlets formed by each of the two heat exchanger bodies are connected to the distillation tower group through a pipeline, and the product argon gas separated by the distillation tower group enters the heat exchanger body in a frozen state through a pipeline and is discharged from the refrigerant replenishment outlet.

[0017] According to one embodiment of the present invention, each of the heat exchanger bodies further forms a first inlet and a first outlet, the first inlet formed by each of the heat exchanger bodies is connected to the two deoxygenation purifiers through a pipeline, and the first outlet formed by each of the heat exchanger bodies is connected to the distillation tower group through a pipeline, and the mixture discharged from the deoxygenation purifier in the adsorption state enters the heat exchanger body in the thawed state through the first inlet and enters the distillation tower group from the first outlet.

[0018] In order to solve the above technical problems and achieve at least one advantage of the present invention, the present invention provides a working method of the argon recovery device, comprising:

[0019] A mixture consisting of argon, nitrogen, carbon dioxide and oxygen is introduced into the decarbonization purifier in an adsorption state, and carbon dioxide in the mixture is adsorbed by the decarbonization purifier in an adsorption state, so that a mixture consisting of argon, oxygen and nitrogen is discharged from the decarbonization purifier in an adsorption state;

[0020] The second mixture is introduced into the deoxygenation reactor, and hydrogen is introduced into the deoxygenation reactor so that the hydrogen reacts with the oxygen in the second mixture to generate water vapor;

[0021] A mixture 4 consisting of hydrogen, water vapor, argon and nitrogen is discharged from the deoxygenation reactor and then introduced into the deoxygenation purifier in an adsorption state through a pipeline. The deoxygenation purifier in the adsorption state adsorbs water vapor in the mixture 4, so as to discharge a mixture 5 consisting of argon, nitrogen and hydrogen from the deoxygenation purifier in the adsorption state.

[0022] The mixture 5 is passed into the separation device through a pipeline, and the separation device separates the mixture 5 to obtain product argon, a small amount of crude argon and hydrogen;

[0023] The product argon gas separated by the separation device is introduced into the decarbonization purifier in the regeneration state and the deoxygenation purifier in the regeneration state through a pipeline, and the product argon gas displaces the carbon dioxide adsorbed in the decarbonization purifier in the regeneration state and the water vapor in the deoxygenation purifier in the regeneration state, and a mixture of carbon dioxide and argon gas three is discharged from the decarbonization purifier in the regeneration state, and a mixture of water vapor and argon gas six is ​​discharged from the deoxygenation purifier in the regeneration state;

[0024] Mixture 3 and mixture 6 are introduced into the heat exchanger body in a frozen state through pipelines, the crude argon gas separated by the separation device is introduced into the heat exchanger body in a frozen state, carbon dioxide and water are frozen in the heat exchanger body in a frozen state, and the argon gas in mixture 3 and mixture 6 is discharged;

[0025] The crude argon gas discharged from the heat exchanger body in a frozen state is then injected into the heat exchanger body in a thawed state, so that the crude argon gas after absorbing the heat of mixture three and mixture six defrosts the carbon dioxide and water frozen in the heat exchanger body in a thawed state.

[0026] Compared with the prior art, the argon recovery device and the working method thereof provided by the present invention have the following technical effects:

[0027] 1. The present invention uses the recovered product argon as the regeneration gas for the decarbonization purifier and the deoxygenation purifier, thereby eliminating the need for an air compressor, thereby reducing the energy consumption of the present invention. At the same time, argon as the regeneration gas can reduce the amount of oxygen introduced from the outside, thereby reducing the amount of hydrogen used and improving the recovery efficiency.

[0028] 2. The present invention is provided with the separation equipment and the heat exchange device. When the separation equipment separates the mixture five after decarbonization and deoxygenation, the heat exchange device continuously separates the regenerated products of the decarbonization purifier and the deoxygenation purifier. The separation equipment and the heat exchange device operate simultaneously to realize uninterrupted recovery of argon, thereby increasing the recovery amount of argon and improving the recovery efficiency of argon.

[0029] 3. The present invention utilizes the cold energy carried by the separated contaminated argon gas to separate the argon gas in the regenerated products of the decarbonization purifier and the deoxygenation purifier, and utilizes the heat carried by the regenerated products to defrost the heat exchanger body provided in the heat exchange device, thereby further reducing the energy consumption required by the present invention.

[0030] 4. The present invention is provided with two decarbonization purifiers and two deoxygenation purifiers to ensure that when one deoxygenation purifier and one decarbonization purifier are adsorbing, the other deoxygenation purifier and another decarbonization purifier are regenerating. By switching the two deoxygenation purifiers and coordinating the switching of the two decarbonization purifiers, the argon recovery device can decarbonize and deoxygenate uninterruptedly.

[0031] 5. The present invention uses the auxiliary heat exchanger to perform heat exchange between the product argon gas discharged from the distillation tower group and the mixture five before being injected into the distillation tower group, so that the mixture five before being injected into the distillation tower group can recover part of the cold energy of the product argon gas discharged from the distillation tower group, thereby reducing the energy consumption of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The structural block diagram of the argon recovery device of the present invention is shown.

[0033] Figure 2 Shows Figure 1Enlarged schematic diagram of part A in the middle.

[0034] Reference numerals:

[0035] 10. Pretreatment unit; 11. Dust collector; 12. Carbon monoxide reactor;

[0036] 20. Decarbonization unit; 21. Decarbonization purifier;

[0037] 30. Deoxygenation unit; 31. Deoxygenation reactor; 32. Deoxygenation purifier;

[0038] 40. Argon extraction unit; 41. Separation equipment; 411. Auxiliary heat exchanger; 41101. Second refrigerant inlet; 41102. Second refrigerant outlet; 41103. Second inlet; 41104. Second outlet; 41105. Hydrogen inlet; 41106. Hydrogen outlet; 41107. Reheat inlet; 41108. Reheat outlet; 412. Distillation tower group; 42. Heat exchange device; 421. Heat exchanger body; 42101. First refrigerant inlet; 42102. First refrigerant outlet; 42103. Refrigerant supplement inlet; 42104. Refrigerant supplement outlet; 42105. First inlet; 42106. First outlet; 422. Pipe group; 4221. Input pipe; 4222. Output pipe; 4223. Heat medium inlet pipe; 4224. Heat medium outlet pipe; 423. Heater. DETAILED DESCRIPTION

[0039] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0040] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "steam level", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0041] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0042] refer to Figure 1 to Figure 2 , an argon recovery device according to a preferred embodiment of the present invention will be described in detail below.

[0043] The argon recovery device includes a pretreatment unit 10 , a decarbonization unit 20 , a deoxidation unit 30 and an argon extraction unit 40 .

[0044] The raw gas is discharged after being processed by the pretreatment unit 10, and the raw gas includes argon, nitrogen, solid particles, carbon dioxide and oxygen / carbon monoxide. A mixture of argon, nitrogen, carbon dioxide and oxygen is discharged from the pretreatment unit 10.

[0045] When there is sufficient oxygen in the raw gas, all the carbon monoxide gas in the raw gas reacts with oxygen to generate carbon dioxide gas. At this time, the components of the raw gas are argon, nitrogen, solid particles, carbon dioxide gas and oxygen; when the oxygen in the raw gas is scarce, part of the carbon monoxide gas in the raw gas reacts with oxygen to generate carbon dioxide gas. At this time, the components of the raw gas are argon, nitrogen, solid particles, carbon dioxide gas and carbon monoxide gas.

[0046] Specifically, the pre-treatment unit 10 includes a dust collector 11, the raw gas is introduced into the dust collector 11, and the dust collector 11 is used to remove solid particulate matter in the raw gas.

[0047] Preferably, the pretreatment unit 10 further includes a carbon monoxide reactor 12, and the dust collector 11 is connected to the carbon monoxide reactor 12 through a pipeline. The raw gas from which solid particulate matter is removed and discharged from the dust collector 11 enters the carbon monoxide reactor 12 through a pipeline, and the carbon monoxide reactor 12 allows clean air to flow in. When the oxygen content in the raw gas is low, the carbon monoxide gas contained in the raw gas from which solid particulate matter is removed reacts with the oxygen in the clean air, so that the carbon monoxide gas in the raw gas completely reacts to generate carbon dioxide gas.

[0048] The decarbonization unit 20 includes two decarbonization purifiers 21. Both of the decarbonization purifiers 21 are connected to the carbon monoxide reactor 12 through a pipeline, and the decarbonization purifiers 21 are used to adsorb carbon dioxide gas. Each of the decarbonization purifiers 21 has an adsorption state and a regeneration state. When one of the decarbonization purifiers 21 is in the adsorption state, the other of the decarbonization purifiers 21 is in the regeneration state.

[0049] In this way, the mixture 1 discharged from the pretreatment unit 10 enters the decarbonization purifier 21 in the adsorption state through the pipeline, so that the carbon dioxide gas in the mixture 1 is adsorbed by the decarbonization purifier 21 in the adsorption state, and then the decarbonization purifier 21 in the adsorption state discharges the mixture 2 composed of argon, oxygen and nitrogen. The product argon gas is passed into the decarbonization purifier 21 in the regeneration state as the regeneration gas, and the product argon gas replaces the carbon dioxide gas adsorbed by the decarbonization purifier 21 in the regeneration state, and then the decarbonization purifier 21 in the regeneration state discharges the mixture 3 composed of argon and carbon dioxide gas, and the decarbonization purifier 21 in the regeneration state restores the adsorption capacity after regeneration.

[0050] The deoxygenation unit 30 includes a deoxygenation reactor 31 and two deoxygenation purifiers 32. The deoxygenation reactor 31 is connected to the two decarbonization purifiers 21 through a pipeline, and the deoxygenation reactor 31 is connected to the two deoxygenation purifiers 32 through a pipeline. The deoxygenation purifiers 32 are used to adsorb water vapor. Each of the deoxygenation purifiers 32 has an adsorption state and a regeneration state. When one of the deoxygenation purifiers 32 is in the adsorption state, the other of the deoxygenation purifiers 32 is in the regeneration state.

[0051] Specifically, the mixture 2 discharged from the decarbonization purifier 21 in the adsorption state enters the deoxygenation reactor 31 through a pipeline, and the deoxygenation reactor 31 allows hydrogen to be introduced. Hydrogen reacts with oxygen in the mixture 2 to generate water vapor, and a mixture 4 composed of hydrogen, water vapor, argon and nitrogen is discharged from the deoxygenation reactor 31 and introduced into the deoxygenation purifier 32 in the adsorption state through a pipeline, so that the water vapor in the mixture 4 is adsorbed by the deoxygenation purifier 32 in the adsorption state, and then a mixture 5 composed of argon, nitrogen and hydrogen is discharged from the deoxygenation purifier 32 in the adsorption state. The product argon is introduced into the deoxygenation purifier 32 in the regeneration state as regeneration gas, and the product argon replaces the water vapor adsorbed in the deoxygenation purifier 32 in the regeneration state, and the deoxygenation purifier 32 in the regeneration state discharges a mixture 6 composed of argon and water vapor. The deoxygenation purifier 32 in the regeneration state restores its adsorption capacity after regeneration.

[0052] That is to say, when one deoxygenation purifier 32 and one decarbonization purifier 21 are adsorbing, another deoxygenation purifier 32 and another decarbonization purifier 21 are regenerating, and by switching between the two deoxygenation purifiers 32 and coordinating with the switching between the two decarbonization purifiers 21, the argon recovery device can continuously decarbonize and deoxygenate, so as to improve the efficiency of the argon recovery device in treating mixture one.

[0053] The argon extraction unit 40 includes a separation device 41, which is connected to the two deoxygenation purifiers 32 through a pipeline. The mixture 5 discharged from the deoxygenation purifier 32 in the adsorption state enters the separation device 41 through a pipeline, and the separation device 41 separates the mixture 5 and obtains product argon, a small amount of crude argon and hydrogen. The separation device 41 is connected to the two deoxygenation purifiers 32 and the two decarbonation purifiers 21 through a pipeline, so that the product argon separated by the separation device 41 is passed into the deoxygenation purifier 32 in the regeneration state and the decarbonation purifier 21 in the regeneration state as a regeneration gas.

[0054] The prior art uses an air compressor to blow air as regeneration gas into the decarbonization purifier 21 in the regeneration state to regenerate the decarbonization purifier 21, resulting in high energy consumption of the existing argon recovery device, and the use of air as the regeneration gas will cause a large amount of oxygen to remain in the decarbonization purifier 21 after the adsorption function is restored, resulting in the need to add a large amount of hydrogen during subsequent deoxygenation to complete the oxygen reaction. Due to the excessive amount of hydrogen introduced, the gas processing capacity of the argon recovery device is increased, thereby reducing the processing capacity of the mixture one, and reducing the device's processing efficiency for the mixture one. The present invention uses the recovered product argon as the regeneration gas of the decarbonization purifier 21, so the present invention does not need to set up an air compressor, thereby reducing the energy consumption of the present invention. At the same time, argon is used as the regeneration gas to reduce the amount of oxygen introduced from the outside, thereby reducing the amount of hydrogen used and improving the processing efficiency of the mixture one.

[0055] The argon extraction unit 40 further includes a heat exchange device 42, which includes two heat exchanger bodies 421 and a tube group 422. Each of the heat exchanger bodies 421 has a thawing state and a freezing state. When one of the heat exchanger bodies 421 is in a thawing state, the other of the heat exchanger bodies 421 is in a freezing state. Each of the heat exchanger bodies 421 forms a first refrigerant inlet 42101 and a first refrigerant outlet 42102. The tube group 422 includes two input pipes 4221 and two output pipes 4222, and one of the input pipes 4221 and one of the output pipes 4222 are both connected to one of the heat exchanger bodies 421. The separation device 41 is connected to the first refrigerant inlet 42101 formed by the two heat exchanger bodies 421 through a pipeline. The two deoxygenation purifiers 32 and the two decarbonization purifiers 21 are connected to the input pipes 4221 connected to the two heat exchanger bodies 421 through pipelines.

[0056] The crude argon gas discharged from the separation device 41 is used as a refrigerant and enters the heat exchanger body 421 in a frozen state through a pipeline from the first refrigerant inlet 42101 formed by the heat exchanger body 421 in a frozen state. The mixture three discharged from the decarbonization purifier 21 in a regenerated state and the mixture six discharged from the deoxygenation purifier 32 in a regenerated state enter the heat exchanger body 421 in a frozen state through a pipeline from the input pipe 4221 connected to the heat exchanger body 421 in a frozen state. The crude argon separated from the separation device 41 is heat exchanged with mixture three and mixture six in the heat exchanger body 421 in a frozen state, so that the crude argon discharged from the separation device 41 freezes the carbon dioxide in mixture three and the water vapor in mixture six in the heat exchanger body 421 in a frozen state, and the argon in mixture three and mixture six is ​​discharged in the form of gas phase from the output pipe 4222 connected to the heat exchanger body 421 in a frozen state, so that argon can be separated from mixture three and mixture six. After heat exchange, the crude argon as a refrigerant is discharged from the first refrigerant outlet 42102 formed by the heat exchanger body 421 in a frozen state.

[0057] It can be understood that mixture three and mixture six recover the cold of the crude argon discharged from the separation equipment 41 through the heat exchanger body 421 in a frozen state, and use the cold energy to separate argon from mixture three and mixture six, thereby reducing the energy consumption of the present invention and further improving the economic benefits of the present invention.

[0058] In a preferred embodiment, the temperature of the crude argon separated from the separation device 41 is between -165°C and -175°C; the temperature of the mixture three and the mixture six entering the heat exchanger body 421 from the input pipe 4221 is between 30°C and 40°C.

[0059] In one embodiment, the heat exchanger body 421 forms a heat medium inlet and a heat medium outlet (the heat medium inlet and the heat medium outlet are not shown in the drawings). The first refrigerant outlet 42102 formed by any heat exchanger body 421 is connected to the heat medium inlet formed by another heat exchanger body 421 through a pipeline. The crude argon gas discharged from the first refrigerant outlet 42102 formed by the heat exchanger body 421 in the frozen state enters the heat exchanger body 421 in the thawed state through a pipeline from the heat medium inlet formed by the heat exchanger body 421 in the thawed state, so that the crude argon gas heated up after heat exchange with mixture three and mixture six heats the carbon dioxide and water frozen in the heat exchanger body 421 in the thawed state, and then the carbon dioxide and water are thawed and discharged from the output pipe 4222 connected to the heat exchanger body 421 in the thawed state, and the crude argon gas after heating the solid carbon dioxide and water is discharged from the heat medium outlet formed by the heat exchanger body 421 in the thawed state.

[0060] Preferably, the heat medium outlet is connected to the pretreatment unit 10 through a pipeline so that the crude argon gas can be recovered, thereby increasing the recovery amount of the argon gas.

[0061] As a variant, the tube group 422 further includes two heat medium inlet pipes 4223 and two heat medium outlet pipes 4224, and one of the heat medium inlet pipes 4223 and one of the heat medium outlet pipes 4224 are connected to one of the heat exchanger bodies 421. The first refrigerant outlet 42102 formed by any of the heat exchanger bodies 421 is connected to the heat medium inlet pipe 4223 connected to another of the heat exchanger bodies 421 through a pipeline. The crude argon gas discharged from the first refrigerant outlet 42102 formed by the heat exchanger body 421 in the frozen state enters the heat exchanger body 421 in the thawed state through a pipeline from the heat medium inlet pipe 4223 connected to the heat exchanger body 421 in the thawed state, so that the crude argon gas heated up after heat exchange with mixture three and mixture six heats the carbon dioxide and water frozen in the heat exchanger body 421 in the thawed state, and then the solid carbon dioxide and water are thawed and discharged from the heat medium outlet pipe 4224 connected to the heat exchanger body 421 in the thawed state along with the crude argon gas.

[0062] In both the above-mentioned two embodiments, the dirty argon gas discharged from the heat exchanger body 421 in a frozen state is used to defrost the carbon dioxide and water vapor frozen in the heat exchanger body 421 in a thawed state, so that the carbon dioxide and water frozen in the heat exchanger body 421 in a thawed state are heated to not less than 0° C. Since the heat absorbed by the dirty argon gas discharged from the heat exchanger body 421 in a frozen state comes from the mixture three and the mixture six, the heat of the mixture three and the mixture six is ​​recycled, so the present invention utilizes the heat of the regeneration products of the decarbonization purifier 21 and the deoxygenation purifier 32, and further reduces the energy consumption of the present invention.

[0063] In addition, while one of the heat exchanger bodies 421 is freezing carbon dioxide and water, the other heat exchanger body 421 is thawing carbon dioxide and water. By switching between the two heat exchanger bodies 421, the argon recovery device can uninterruptedly separate the regenerated products of the decarbonization purifier 21 and the deoxygenation purifier 32 to extract argon, thereby improving the argon recovery efficiency and ensuring the recovery amount of argon.

[0064] In order to facilitate those skilled in the art to understand the subsequent technical solutions of the present invention, the subsequent embodiments are described based on the modified embodiments.

[0065] Furthermore, the heat exchange device 42 further includes a heater 423, which is installed on the pipeline connecting the first refrigerant outlet 42102 and the heat medium inlet pipe 4223. The heater 423 is used to heat the crude argon gas discharged from the first refrigerant outlet 42102 formed by the heat exchanger body 421 in a frozen state, so as to ensure that the crude argon gas entering the heat exchanger body 421 in a thawed state from the input pipe 4221 connected to the heat exchanger body 421 in a thawed state can heat the carbon dioxide and water frozen in the heat exchanger body 421 in a thawed state to not less than 0°C.

[0066] In one example, when the temperature of the gas discharged from the heat medium outlet pipe 4224 connected to the heat exchanger body 421 in the thawing state reaches 20° C. to 30° C. and the moisture content is detected to be lower than 3 ppm, the heat exchanger body 421 is thawed.

[0067] Specifically, the separation device 41 includes an auxiliary heat exchanger 411 and a distillation tower group 412. The distillation tower group 412 separates the mixture five by cryogenic distillation to obtain product argon, a small amount of crude argon and hydrogen. Since the distillation tower group 412 separates the mixture five by cryogenic distillation, the product argon, crude argon and hydrogen discharged from the distillation tower group 412 have a low temperature. The distillation tower group 412 is connected to the first refrigerant inlet 42101 through a pipeline, and the crude argon discharged from the distillation tower group 412 enters the heat exchanger body 421 in a frozen state as a refrigerant. The auxiliary heat exchanger 411 forms a second refrigerant inlet 41101, a second refrigerant outlet 41102, a second inlet 41103 and a second outlet 41104. The second inlet 41103 formed by the auxiliary heat exchanger 411 is connected to the two deoxygenation purifiers 32 through a pipeline. The second refrigerant inlet 41101 and the second outlet 41104 formed by the auxiliary heat exchanger 411 are both connected to the distillation tower group 412 through pipelines. The second refrigerant outlet 41102 formed by the auxiliary heat exchanger 411 is connected to the two decarbonization purifiers 21 and the two deoxygenation purifiers 32 through pipelines.

[0068] The product argon gas discharged from the distillation tower group 412 enters the auxiliary heat exchanger 411 through the second refrigerant inlet 41101 as a refrigerant, and performs heat exchange with the mixture 5 discharged from the deoxygenation purifier 32 in the adsorption state and entering the auxiliary heat exchanger 411 through the second inlet 41103. Part of the product argon gas after heat exchange is passed from the second refrigerant outlet 41102 through a pipeline to the decarbonization purifier 21 in the regeneration state and the deoxygenation purifier 32 in the regeneration state, and the remaining part of the product argon gas is discharged from the second refrigerant outlet 41102 and collected for use. The mixture 5 after heat exchange is injected into the distillation tower group 412 from the second outlet 41104 for low-temperature distillation.

[0069] It can be understood that since the distillation tower group 412 uses low-temperature distillation to separate the mixture five, the mixture five needs to be cooled after entering the distillation tower group 412. The present invention uses the auxiliary heat exchanger 411 to exchange heat between the product argon gas discharged from the distillation tower group 412 and the mixture five before being injected into the distillation tower group 412, so that the mixture five before being injected into the distillation tower group 412 can recover part of the cold of the product argon gas discharged from the distillation tower group 412, thereby reducing the energy consumption of the present invention.

[0070] Preferably, the auxiliary heat exchanger 411 also forms a hydrogen inlet 41105 and a hydrogen outlet 41106. The hydrogen inlet 41105 formed by the auxiliary heat exchanger 411 is connected to the distillation tower group 412 through a pipeline, and the hydrogen outlet 41106 formed by the auxiliary heat exchanger 411 is connected to the deoxygenation reactor 31 through a pipeline. The hydrogen discharged from the distillation tower group 412 enters the auxiliary heat exchanger 411 through the pipeline from the hydrogen inlet 41105, so that the hydrogen and the mixture five are heat exchanged in the auxiliary heat exchanger 411, and the heated hydrogen enters the deoxygenation reactor 31 from the hydrogen outlet 41106, so that the hydrogen reacts with the oxygen in the mixture two to generate water vapor. In this process, the circulation of hydrogen and the recovery of hydrogen cooling are realized.

[0071] Preferably, the auxiliary heat exchanger 411 further forms a reheating inlet 41107 and a reheating outlet 41108. The reheating inlet 41107 formed by the auxiliary heat exchanger 411 is connected to the output pipes 4222 connected to the two heat exchanger bodies 421 through pipelines. The argon gas discharged from the output pipe 4222 connected to the heat exchange device 42 in the thawing state enters the auxiliary heat exchanger 411 through the reheating inlet 41107 to perform heat exchange with the mixture five in the auxiliary heat exchanger 411 and be discharged from the reheating outlet 41108, and then the argon gas coldness discharged from the output pipe 4222 connected to the heat exchanger body 421 in the thawing state is recovered.

[0072] In one example, the reheat outlet 41108 is connected to the pretreatment unit 10 through a pipeline, so that the argon gas discharged from the output pipe 4222 connected to the heat exchanger body 421 in a thawed state is recovered and further purified.

[0073] Furthermore, each of the heat exchanger bodies 421 also forms a refrigerant supplement inlet 42103 and a refrigerant supplement outlet 42104, and the refrigerant supplement inlet 42103 formed by each of the two heat exchanger bodies 421 is connected to the distillation tower group 412 through a pipeline. The product argon gas separated by the distillation tower group 412 can be used as a supplementary refrigerant to enter the heat exchanger body 421 in a frozen state through a pipeline to perform heat exchange with mixture three and mixture six. The product argon gas after heat exchange with mixture three and mixture six is ​​discharged from the refrigerant supplement outlet 42104 and collected for use.

[0074] It can be understood that when the flow rate of the crude argon separated by the distillation tower group 412 is small, part of the product argon separated by the distillation tower group 412 can be used as a refrigerant to pass to the heat exchanger body 421 in a frozen state, so as to supplement the cold energy to the heat exchanger body 421 in a frozen state, thereby ensuring that the carbon dioxide in mixture three and the water in mixture six are frozen in the heat exchanger body 421 in a frozen state.

[0075] In one embodiment, each of the heat exchanger bodies 421 further forms a first inlet 42105 and a first outlet 42106. The first inlet 42105 formed in each of the heat exchanger bodies 421 is connected to the two deoxygenation purifiers 32 through a pipeline, and the first outlet 42106 formed in each of the heat exchanger bodies 421 is connected to the distillation tower group 412 through a pipeline. The mixture five discharged from the deoxygenation purifier 32 in the adsorption state enters the heat exchanger body 421 in the thawed state through the first inlet 42105. In this way, the mixture five before entering the distillation tower group 412 is passed into the heat exchanger body 421 in the thawed state to recover the cold energy of the carbon dioxide and water frozen in the heat exchanger body 421, and the mixture five after heat exchange enters the distillation tower group 412 from the first outlet 42106 to be distilled.

[0076] It is worth mentioning that the present invention is provided with the separation equipment 41 and the heat exchange device 42. When the separation equipment 41 separates the mixture five after decarbonization and deoxygenation, the heat exchange device 42 continuously separates the regenerated products of the decarbonization purifier 21 and the deoxygenation purifier 32. The separation equipment 41 and the heat exchange device 42 operate simultaneously to realize uninterrupted recovery of argon, thereby increasing the recovery amount of argon and improving the recovery efficiency of argon.

[0077] The present invention also provides a working method of the argon recovery device, comprising the following steps:

[0078] Decarburization operation: (1) A mixture 1 composed of argon, nitrogen, carbon dioxide and oxygen is introduced into the decarburization purifier 21 in an adsorption state, the carbon dioxide in the mixture 1 is adsorbed by the decarburization purifier 21 in an adsorption state, and a mixture 2 composed of argon, oxygen and nitrogen is discharged from the decarburization purifier 21 in an adsorption state.

[0079] Deoxygenation operation: (1) Mixture 2 is introduced into the deoxygenation reactor 31, and hydrogen is introduced into the deoxygenation reactor 31, so that the hydrogen reacts with the oxygen in mixture 2 to generate water vapor, and mixture 4 composed of hydrogen, water vapor, argon and nitrogen is discharged from the deoxygenation reactor 31.

[0080] (2) The mixture 4 is introduced into the deoxygenation purifier 32 in the adsorption state through a pipeline. The deoxygenation purifier 32 in the adsorption state adsorbs water vapor in the mixture 4, and discharges a mixture 5 composed of argon, nitrogen and hydrogen from the deoxygenation purifier 32 in the adsorption state.

[0081] Purification operation: the mixture 5 is passed into the separation device 41 through a pipeline, and the separation device 41 separates the mixture 5 to obtain product argon, a small amount of crude argon and hydrogen.

[0082] At the same time, the product argon gas separated by the separation equipment 41 is introduced into the decarbonization purifier 21 in the regeneration state and the deoxygenation purifier 32 in the regeneration state through a pipeline, and the product argon gas displaces the carbon dioxide adsorbed in the decarbonization purifier 21 in the regeneration state and the water vapor in the deoxygenation purifier 32 in the regeneration state, and then a mixture three composed of carbon dioxide and argon is discharged from the decarbonization purifier 21 in the regeneration state, and a mixture six composed of water vapor and argon is discharged from the deoxygenation purifier 32 in the regeneration state.

[0083] When the decarbonization purifier 21 in the adsorption state reaches saturation, the two decarbonization purifiers 21 are switched, and the decarbonization purifier 21 originally in the adsorption state enters the regeneration state, while the decarbonization purifier 21 originally in the regeneration state enters the adsorption state. When the deoxygenation purifier 32 in the adsorption state reaches saturation, the two deoxygenation purifiers 32 are switched, and the deoxygenation purifier 32 originally in the adsorption state enters the regeneration state, while the deoxygenation purifier 32 originally in the regeneration state enters the adsorption state.

[0084] Mixture 3 and mixture 6 are introduced into the heat exchanger body 421 in a frozen state through pipelines, and the crude argon gas separated by the separation device 41 is introduced into the heat exchanger body 421 in a frozen state, so that the crude argon gas and mixture 3 and mixture 6 are heat exchanged, and carbon dioxide and water are frozen in the heat exchanger body 421 in a frozen state, while the argon gas in mixture 3 and mixture 6 is discharged, and then the argon gas in mixture 3 and mixture 6 is separated;

[0085] The crude argon gas discharged from the heat exchanger body 421 in a frozen state is then injected into the heat exchanger body 421 in a thawed state, so that the crude argon gas after absorbing the heat of mixture three and mixture six defrosts the carbon dioxide and water frozen in the heat exchanger body 421 in a thawed state, thereby restoring the circulation of the pipeline of the heat exchanger body 421 in a thawed state.

[0086] Preferably, the raw gas is introduced into the dust collector 11 provided in the pretreatment unit 10, and the dust collector 11 removes solid particulate matter in the raw gas.

[0087] Preferably, the raw gas from which solid particulate matter has been removed is introduced into the carbon monoxide reactor 12, and the raw gas from which solid particulate matter has been removed reacts with oxygen in the carbon monoxide reactor 12 to remove carbon monoxide gas in the raw gas, thereby obtaining a mixture one.

[0088] Furthermore, the mixture five discharged from the deoxygenation purifier 32 in the adsorption state enters the auxiliary heat exchanger 411, and the product argon gas discharged from the distillation tower group 412 is injected into the auxiliary heat exchanger 411, so that the mixture five is first heat-exchanged with the product argon gas before being injected into the distillation tower group 412 to recover the cold of the product argon gas and reduce its own temperature. The mixture five after the heat exchange is passed into the distillation tower group 412, and part of the product argon gas after the heat exchange is passed into the decarbonization purifier 21 in the regeneration state and the deoxygenation purifier 32 in the regeneration state as the regeneration gas.

[0089] Preferably, the hydrogen discharged from the distillation tower group 412 is heat exchanged with the mixture five through the auxiliary heat exchanger 411 to recover cold energy, and the hydrogen after the heat exchange is injected into the deoxygenation reactor 31 to combine with the oxygen in the mixture two.

[0090] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. Argon gas recovery device, characterized in that: The argon recovery device comprises: A decarbonization unit, wherein the decarbonization unit comprises two decarbonization purifiers, wherein the decarbonization purifiers are used to adsorb carbon dioxide gas, wherein one of the decarbonization purifiers is in the adsorption state and the other is in the regeneration state, wherein a mixture of argon, carbon dioxide gas, nitrogen and oxygen enters the decarbonization purifier in the adsorption state through a pipeline; A deoxygenation unit, the deoxygenation unit comprises a deoxygenation reactor and two deoxygenation purifiers, the deoxygenation reactor is connected to the two decarbonation purifiers through a pipeline, the deoxygenation reactor is connected to the two deoxygenation purifiers through a pipeline, the deoxygenation purifier is used to adsorb water vapor, one of the deoxygenation purifiers is in adsorption, and the other is in regeneration, the deoxygenation reactor allows hydrogen to be introduced, the mixture of argon, oxygen, and nitrogen discharged from the decarbonation purifier in the adsorption state enters the deoxygenation reactor through a pipeline, and the mixture of hydrogen, water vapor, argon, and nitrogen discharged from the deoxygenation reactor is introduced into the deoxygenation purifier in the adsorption state through a pipeline; An argon extraction unit, the argon extraction unit comprising: A separation device, the separation device is connected to the two deoxygenation purifiers through a pipeline, and a mixture of argon, nitrogen and hydrogen discharged from the deoxygenation purifier in an adsorption state enters the separation device through a pipeline, and the separation device separates the mixture. The separation device is connected to the two deoxygenation purifiers and the two decarbonation purifiers through a pipeline, and the product argon obtained by the separation device enters the deoxygenation purifier in a regeneration state and the decarbonation purifier in a regeneration state through a pipeline; A heat exchange device, the heat exchange device includes two heat exchanger bodies and a tube group, one of the heat exchanger bodies is thawed and the other is frozen, each of the heat exchanger bodies forms a first refrigerant inlet and a first refrigerant outlet, the tube group includes two input pipes, two output pipes, two heat medium inlet pipes and two heat medium outlet pipes, one of the input pipes, one of the output pipes, one of the heat medium inlet pipes and one of the heat medium outlet pipes are all connected to one of the heat exchanger bodies, the separation device is connected to the first refrigerant inlet formed by each of the two heat exchanger bodies through a pipeline, the two deoxygenation purifiers and the two decarbonization purifiers are connected to the two input pipes through a pipeline, the first refrigerant outlet formed by any of the heat exchanger bodies is connected to the heat medium inlet pipe connected to the other heat exchanger body through a pipeline, The crude argon gas separated by the separation equipment enters the heat exchanger body in a frozen state through the first refrigerant inlet, the deoxygenation purifier in the regenerated state discharges a mixture six consisting of argon and water vapor, and the decarbonization purifier in the regenerated state discharges a mixture three consisting of argon and carbon dioxide from the input pipe into the heat exchanger body in a frozen state, and the argon in the mixture three and the mixture six are discharged from the output pipe connected to the heat exchanger body in a frozen state. After heat exchange, the crude argon gas enters the heat exchanger body in a thawed state from the first refrigerant outlet formed by the heat exchanger body in a frozen state through the pipeline from the heat medium inlet pipe, and the thawed carbon dioxide and water are discharged from the heat medium outlet pipe along with the crude argon gas.

2. The argon recovery device according to claim 1, characterized in that: The argon recovery device includes a pretreatment unit, which includes a carbon monoxide reactor. The carbon monoxide reactor is connected to the two decarbonization purifiers through a pipeline. The carbon monoxide reactor allows clean air to enter. The mixture discharged from the carbon monoxide reactor enters the decarbonization purifier in an adsorption state through a pipeline.

3. The argon recovery device according to claim 2, characterized in that: The pretreatment unit further comprises a dust collector, which is connected to the carbon monoxide reactor through a pipeline and is used to remove solid particulate matter.

4. The argon recovery device according to claim 3, characterized in that: The heat exchange device also includes a heater, which is installed on a pipeline connecting the first refrigerant outlet and the heat medium inlet pipe, and is used to heat the crude argon gas discharged from the first refrigerant outlet formed by the heat exchanger body in a frozen state.

5. The argon recovery device according to claim 4, characterized in that: The separation equipment includes an auxiliary heat exchanger and a distillation tower group. The distillation tower group separates the mixture five by low-temperature distillation. The distillation tower group is connected to the first refrigerant inlet through a pipeline. The auxiliary heat exchanger forms a second refrigerant inlet, a second refrigerant outlet, a second inlet and a second outlet. The second inlet formed by the auxiliary heat exchanger is connected to the two deoxygenation purifiers through a pipeline. The second refrigerant inlet and the second outlet formed by the auxiliary heat exchanger are both connected to the distillation tower group through a pipeline. The second refrigerant outlet formed by the auxiliary heat exchanger is connected to the two decarbonization purifiers and the two deoxygenation purifiers through a pipeline. The product argon gas discharged from the distillation tower group enters the auxiliary heat exchanger from the second refrigerant inlet, is discharged from the deoxygenation purifier in an adsorption state and enters the auxiliary heat exchanger through the second inlet. The product argon gas after heat exchange is discharged from the second refrigerant outlet, and the mixture five is injected into the distillation tower group from the second outlet.

6. The argon recovery device according to claim 5, characterized in that: The auxiliary heat exchanger also forms a hydrogen inlet and a hydrogen outlet. The hydrogen inlet formed by the auxiliary heat exchanger is connected to the distillation tower group through a pipeline, and the hydrogen outlet formed by the auxiliary heat exchanger is connected to the deoxygenation reactor through a pipeline. The hydrogen discharged from the distillation tower group enters the auxiliary heat exchanger from the hydrogen inlet through the pipeline, and the heated hydrogen enters the deoxygenation reactor from the hydrogen outlet.

7. The argon recovery device according to claim 6, characterized in that: The auxiliary heat exchanger also forms a reheating inlet and a reheating outlet. The reheating inlet formed by the auxiliary heat exchanger is connected to the output pipes connected to the two heat exchanger bodies through pipelines. The argon gas discharged from the output pipes connected to the heat exchange device in the thawing state enters the auxiliary heat exchanger through the reheating inlet and is discharged from the reheating outlet. The reheating outlet is connected to the pretreatment unit through a pipeline.

8. The argon recovery device according to claim 7, characterized in that: Each of the heat exchanger bodies also forms a refrigerant replenishment inlet and a refrigerant replenishment outlet. The refrigerant replenishment inlets formed by each of the two heat exchanger bodies are connected to the distillation tower group through a pipeline. The product argon gas separated by the distillation tower group enters the heat exchanger body in a frozen state through a pipeline and is discharged from the refrigerant replenishment outlet.

9. The argon recovery device according to claim 8, characterized in that: Each of the heat exchanger bodies also forms a first inlet and a first outlet. The first inlet formed by each of the heat exchanger bodies is connected to the two deoxygenation purifiers through a pipeline, and the first outlet formed by each of the heat exchanger bodies is connected to the distillation tower group through a pipeline. The mixture discharged from the deoxygenation purifier in the adsorption state enters the heat exchanger body in the thawed state through the first inlet and enters the distillation tower group from the first outlet.

10. The working method of the argon recovery device according to any one of claims 1 to 9, characterized in that: include: A mixture consisting of argon, nitrogen, carbon dioxide and oxygen is introduced into the decarbonization purifier in an adsorption state, and carbon dioxide in the mixture is adsorbed by the decarbonization purifier in an adsorption state, so that a mixture consisting of argon, oxygen and nitrogen is discharged from the decarbonization purifier in an adsorption state; The second mixture is introduced into the deoxygenation reactor, and hydrogen is introduced into the deoxygenation reactor so that the hydrogen reacts with the oxygen in the second mixture to generate water vapor; A mixture 4 consisting of hydrogen, water vapor, argon and nitrogen is discharged from the deoxygenation reactor and then introduced into the deoxygenation purifier in an adsorption state through a pipeline. The deoxygenation purifier in the adsorption state adsorbs water vapor in the mixture 4, so as to discharge a mixture 5 consisting of argon, nitrogen and hydrogen from the deoxygenation purifier in the adsorption state. The mixture 5 is passed into the separation device through a pipeline, and the separation device separates the mixture 5 to obtain product argon, a small amount of crude argon and hydrogen; The product argon gas separated by the separation device is introduced into the decarbonization purifier in the regeneration state and the deoxygenation purifier in the regeneration state through a pipeline, and the product argon gas displaces the carbon dioxide adsorbed in the decarbonization purifier in the regeneration state and the water vapor in the deoxygenation purifier in the regeneration state, and a mixture of carbon dioxide and argon gas three is discharged from the decarbonization purifier in the regeneration state, and a mixture of water vapor and argon gas six is ​​discharged from the deoxygenation purifier in the regeneration state; Mixture 3 and mixture 6 are introduced into the heat exchanger body in a frozen state through pipelines, the crude argon gas separated by the separation device is introduced into the heat exchanger body in a frozen state, carbon dioxide and water are frozen in the heat exchanger body in a frozen state, and the argon gas in mixture 3 and mixture 6 is discharged; The crude argon gas discharged from the heat exchanger body in a frozen state is then injected into the heat exchanger body in a thawed state, so that the crude argon gas after absorbing the heat of mixture three and mixture six defrosts the carbon dioxide and water frozen in the heat exchanger body in a thawed state.

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