Drying device for argon recovery and working method thereof

Abstract

The invention discloses a drying device for argon recovery and a working method thereof. The drying device for argon recovery comprises a drying unit, a heating mechanism and a recovery unit. The drying unit comprises at least one drying mechanism, each drying mechanism comprises an adsorption tower and a first pipe group, each first pipe group comprises an input pipe, an output pipe, a gas conveying pipe and a discharge pipe, low-temperature humid raw material gas enters the adsorption tower through the input pipe, and water in the low-temperature humid raw material gas is adsorbed by the adsorption tower; and dry raw material gas discharged from the adsorption tower enters recovery equipment through an output pipe. The heating mechanism comprises a heating equipment body and a gas inlet pipe, low-temperature humid raw material gas enters the heating equipment body through the gas inlet pipe to obtain high-temperature humid raw material gas, the high-temperature humid raw material gas exhausted from the heating equipment body enters the adsorption tower through the gas conveying pipe, and waste gas is exhausted from the exhaust pipe. The recovery unit comprises a recovery mechanism and a return pipe, and waste gas discharged from the adsorption tower enters the recovery mechanism through a discharge pipe.

Description

Technical Field

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

[0002] Argon is an inert gas and is widely used as a protective gas in industrial production. The raw gas recovered from the single crystal furnace contains argon, nitrogen, oxygen, carbon monoxide and water. The existing argon recovery device includes a drying device and a recovery device. The raw gas needs to be dried by the drying device before entering the recovery device to remove the moisture in the raw gas. After becoming dry raw gas, it enters the recovery device. The dry raw gas flows through the decarbonization unit, deoxygenation unit and distillation unit provided in the recovery device in turn for decarbonization, deoxygenation and distillation.

[0003] CN204778831U discloses an argon dryer, which includes a blower, a cooler, an adsorption tower A, an adsorption tower B, a heater, and a hot air blower. The raw gas is sent to the cooler by the blower, and then cooled by the cooler, and then enters the adsorption tower A or the adsorption tower B for adsorption. When the adsorption tower A or the adsorption tower B is regenerated, the argon dryer uses a hot air blower to extract the atmosphere and transport it to the heater, and then blows the desiccant of the regeneration tower after heating by the heater, and then cools. Before the regeneration tower is switched to a working state, a small amount of argon is injected into the tower to replace the gas in the regeneration tower. In other words, the prior art uses high-temperature air to purge the adsorption tower, and then uses argon as a replacement gas to replace the air trapped in the adsorption tower. During the regeneration process of the adsorption tower, the exhaust gas composed of raw gas, air, argon, and water vapor will be discharged from the adsorption tower. Since there is air in the exhaust gas, the exhaust gas contains a large amount of oxygen, nitrogen, carbon dioxide and other gases.

[0004] If the waste gas is discharged directly, the argon in the waste gas will be lost, resulting in a waste of argon. If both the waste gas and the raw gas are directed to the recovery equipment to recover the argon, when the waste gas flows through the deoxygenation unit for deoxygenation, a large amount of excess hydrogen needs to be added to the deoxygenation unit to ensure that the oxygen can react completely. Due to the excessive amount of hydrogen introduced, the gas processing capacity of the recovery equipment will increase, resulting in a decrease in the processing efficiency of the recovery equipment for the raw gas and waste gas. In addition, the nitrogen in the mixed gas will increase the distillation burden of the distillation unit, resulting in an increase in the amount of dirty argon produced by the distillation tower, which increases the energy consumption of the recovery equipment and reduces the recovery rate of argon. Summary of the invention

[0005] In order to solve the above technical problems and achieve at least one advantage of the present application, the present application provides a drying device for argon recovery, the drying device for argon recovery comprising:

[0006] A drying unit, wherein the drying unit comprises at least one drying mechanism, each of the drying mechanisms comprises an adsorption tower and a first tube group, each of the first tube groups comprises an input tube, an output tube, a gas transmission tube and a discharge tube, the adsorption tower is connected to the input tube, the output tube, the gas transmission tube and the discharge tube, the low-temperature humid raw gas enters the adsorption tower through the input tube, the adsorption tower can adsorb water, the water in the low-temperature humid raw gas is adsorbed by the adsorption tower, and dry raw gas is obtained, the output tube is connected to a recovery device, and the dry raw gas discharged from the adsorption tower enters the recovery device through the output tube;

[0007] A heating mechanism, wherein the heating mechanism comprises a heating device body and an air inlet pipe, wherein the air inlet pipe is connected to the heating device body, and low-temperature humid raw gas enters the heating device body through the air inlet pipe, and the heating device body can heat the low-temperature humid raw gas during operation to obtain high-temperature humid raw gas, wherein the air delivery pipe is connected to the heating device body and the adsorption tower, and the high-temperature humid raw gas discharged from the heating device body enters the adsorption tower through the air delivery pipe, and the purged high-temperature humid raw gas and water vapor are discharged from the discharge pipe as waste gas, and an inlet and outlet are formed in the adsorption tower, and dry raw gas and / or low-temperature humid raw gas enter the adsorption tower through the inlet and outlet, and the purged dry raw gas and / or low-temperature humid raw gas and the replaced high-temperature humid raw gas are discharged from the discharge pipe as waste gas;

[0008] The recovery unit includes a recovery mechanism and a reflux pipe, the reflux pipe is connected to the input pipe and the recovery mechanism, the discharge pipe is connected to the recovery mechanism, the waste gas discharged from the adsorption tower enters the recovery mechanism through the discharge pipe, the recovery mechanism is used to remove part of the moisture in the waste gas, and the waste gas with part of the moisture removed is discharged to the adsorption tower through the reflux pipe.

[0009] According to an embodiment of the present application, the recovery mechanism includes a cooling component and a dehydration component, the cooling component forms a third air inlet, a third air outlet and a third drain, the dehydration component forms a fourth air inlet, a fourth air outlet and a fourth drain, the third air inlet formed by the cooling component is connected to the exhaust pipe, the exhaust gas enters the cooling component through the third air inlet, the cooling component is used to reduce the temperature of the exhaust gas, water in the exhaust gas is discharged from the third drain formed by the cooling component, the reflux pipe is connected to the fourth air outlet formed by the dehydration component, the fourth air inlet formed by the dehydration component is connected to the third air outlet formed by the cooling component through a pipeline, the dehydration component is configured to filter out water, the low-temperature exhaust gas discharged from the third air outlet flows to the dehydration component through a pipeline, the low-temperature exhaust gas dried by the dehydration component is discharged from the fourth air outlet formed by the dehydration component, and passes through the reflux pipe to the adsorption tower, and water is discharged from the fourth drain formed by the dehydration component.

[0010] According to an embodiment of the present application, the drying mechanism further includes a temperature detection component, which is installed in the adsorption tower to detect the temperature inside the adsorption tower.

[0011] According to an embodiment of the present application, the drying device for argon recovery includes a pretreatment unit, and the pretreatment unit includes a cooling mechanism and a dehumidification mechanism. The cooling mechanism forms a first air inlet, a first air outlet, and a first drain. The medium-temperature humid raw gas enters the cooling mechanism through the first air inlet. The cooling mechanism is used to reduce the temperature of the medium-temperature humid raw gas and obtain a low-temperature humid raw gas. Part of the water is discharged from the first drain formed by the cooling mechanism, and the low-temperature humid raw gas is discharged from the first air outlet. The dehumidification mechanism forms a second air inlet, a second air outlet, and a second air outlet. and a second drain port, the input pipe and the air inlet pipe are connected to the second air outlet formed by the dehumidification mechanism, the second air inlet formed by the dehumidification mechanism is connected to the first air outlet formed by the cooling mechanism through a pipeline, the low-temperature humid raw gas discharged from the first air outlet flows to the dehumidification mechanism through the pipeline, the dehumidification mechanism is configured to filter out water, the water is discharged from the second drain port formed by the dehumidification mechanism, and the low-temperature humid raw gas dried by the dehumidification mechanism is discharged into the input pipe and the air inlet pipe from the second air outlet formed by the dehumidification mechanism.

[0012] According to an embodiment of the present application, the drying unit is provided with two groups of the drying mechanisms, one of the adsorption towers is drying while the other adsorption tower is regenerating.

[0013] According to one embodiment of the present application, the gas supply pipe is connected to the inlet and outlet formed by the adsorption tower, and the low-temperature humid raw gas flows through the heating equipment body in a shutdown state through the gas supply pipe and flows from the gas supply pipe to the adsorption tower.

[0014] According to one embodiment of the present application, the gas pipe connected to the adsorption tower is connected to the inlet and outlet formed by another adsorption tower, and the dry raw gas discharged from the output pipe connected to the adsorption tower in a dry state enters the adsorption tower in a regenerated state through the gas pipe connected to the adsorption tower in a regenerated state.

[0015] In order to solve the above technical problems and achieve at least one advantage of the present application, the present application provides a working method of a drying device for argon recovery, comprising the following steps:

[0016] The low-temperature humid raw gas enters the adsorption tower through the input pipe, the moisture in the low-temperature humid raw gas is adsorbed by the adsorption tower, and dry raw gas is obtained, and the dry raw gas enters the recovery device from the output pipe;

[0017] Stop feeding the low-temperature humid raw gas into the adsorption tower, the low-temperature humid raw gas enters the heating device body through the air inlet pipe, the heating device body heats the low-temperature humid raw gas and obtains high-temperature humid raw gas, the high-temperature humid raw gas is fed into the adsorption tower from the air delivery pipe, the water adsorbed in the adsorption tower is desorbed, and the high-temperature humid raw gas and water vapor are discharged from the discharge pipe as waste gas;

[0018] The dry raw gas and / or the low-temperature humid raw gas enters the adsorption tower through the inlet and outlet, the dry raw gas and / or the low-temperature humid raw gas purges the adsorption tower after being purged by the high-temperature humid raw gas, and the dry raw gas and / or the low-temperature humid raw gas and the replaced high-temperature humid raw gas are discharged from the discharge pipe as waste gas;

[0019] The waste gas is discharged from the discharge pipe into the recovery mechanism, and the waste gas is cooled by the recovery mechanism to precipitate part of water and obtain low-temperature waste gas.

[0020] According to an embodiment of the present application, exhaust gas enters the cooling component from the discharge pipe, the cooling component reduces the temperature of the exhaust gas, liquid water is discharged from the third drain port formed by the cooling component, low-temperature exhaust gas is discharged from the third gas outlet, the low-temperature exhaust gas discharged from the third gas outlet flows to the dehydration component through a pipeline, part of the water is filtered out of the low-temperature exhaust gas when flowing through the dehydration component, the dried low-temperature exhaust gas is discharged from the fourth gas outlet formed by the dehydration component, and passes through the reflux pipe to the adsorption tower in a dry state.

[0021] According to one embodiment of the present application, when one of the adsorption towers is in a dry state, and the other adsorption tower is in a regeneration state, the two adsorption towers switch between the dry state and the regeneration state, and the low-temperature exhaust gas discharged from the recovery mechanism flows from the reflux pipe to the adsorption tower in the dry state.

[0022] The drying device for argon recovery and the working method thereof provided in the present application have the following technical effects compared with the prior art:

[0023] 1. The present application uses high-temperature humid raw gas to purge the adsorption tower, and uses low-temperature humid raw gas and / or dry raw gas to cool the adsorption tower, so as to regenerate the adsorption tower without introducing air. Therefore, the waste gas generated during the regeneration of the adsorption tower can be directly introduced into the recovery equipment for recovery after drying, thereby avoiding argon loss, improving the recovery rate of argon, and reducing the energy consumption required for subsequent recovery of argon by the recovery equipment.

[0024] 2. The present application is provided with two drying mechanisms, and the two adsorption towers are operated in parallel. When one adsorption tower is drying, the other adsorption tower is regenerating. By switching between the two drying mechanisms, the present application can continuously dry the moist raw gas, thereby improving the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of an embodiment of a drying device for argon recovery described in the present application is shown.

[0026] Figure 2 A schematic structural diagram of another embodiment of the drying device for argon recovery described in the present application is shown.

[0027] Figure 3 Shows Figure 1 Schematic diagram of the structure of part A.

[0028] Reference numerals

[0029] 10. Pretreatment unit; 11. Cooling mechanism; 1101. First air inlet; 1102. First air outlet; 1103. First drain outlet; 12. Dehumidification mechanism; 1201. Second air inlet; 1202. Second air outlet; 1203. Second drain outlet.

[0030] 20. Drying unit; 21. Drying mechanism; 211. Adsorption tower; 21101. Inlet and outlet; 212. First pipe group; 2121. Input pipe; 2122. Output pipe; 2123. Gas pipe; 2124. Discharge pipe; 213. First valve group; 2131. First inlet control valve; 2132. First outlet control valve; 2133. Second inlet control valve; 2134. Second outlet control valve; 214. Temperature detection element; 22. Pressure equalizing pipe; 23. Pressure control valve.

[0031] 30. Heating mechanism; 31. Heating device body; 32. Air intake pipe.

[0032] 40. Recovery unit; 41. Recovery mechanism; 411. Cooling component; 41101. Third air inlet; 41102. Third air outlet; 41103. Third drain outlet; 412. Dehydration component; 41201. Fourth air inlet; 41202. Fourth air outlet; 41203. Fourth drain outlet; 42. Reflux pipe; 43. Temporary storage tank.

[0033] 90. Recycling equipment. DETAILED DESCRIPTION

[0034] The following description is used to disclose the present application so that those skilled in the art can implement the present application. 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 application defined in the following description can be applied to other embodiments, variations, improvements, equivalent solutions, and other technical solutions that do not deviate from the spirit and scope of the present application.

[0035] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application 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 application.

[0036] 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.

[0037] refer to Figures 1 to 3 According to a preferred embodiment of the present application, a drying device for argon recovery will be described in detail below. The drying device for argon recovery can dry the wet raw gas to remove water in the wet raw gas, thereby obtaining dry raw gas. The wet raw gas includes argon, nitrogen, oxygen, carbon monoxide and saturated water. The dry raw gas discharged from the drying device for argon recovery is passed into the recovery device 90, so that the argon in the dry raw gas is recovered by the recovery device 90.

[0038] Specifically, the drying device for argon recovery includes a pretreatment unit 10. The pretreatment unit 10 includes a cooling mechanism 11, and the cooling mechanism 11 forms a first air inlet 1101, a first air outlet 1102 and a first drain 1103. The medium-temperature humid raw gas enters the cooling mechanism 11 through the first air inlet 1101, and the cooling mechanism 11 is used to reduce the temperature of the medium-temperature humid raw gas to obtain a low-temperature humid raw gas. The water in the medium-temperature humid raw gas changes from gas to liquid after cooling, and part of the liquid water is discharged from the first drain 1103 formed by the cooling mechanism 11, and the low-temperature humid raw gas is discharged from the first air outlet 1102. That is to say, the low-temperature humid raw gas discharged from the first air outlet 1102 has a lower humidity than the medium-temperature humid raw gas, thereby shortening the time required for later drying of the low-temperature humid raw gas.

[0039] In one example, medium-temperature humid raw gas at 30°C to 60°C enters the cooling mechanism 11 through the first air inlet 1101 , and after being cooled by the cooling mechanism 11 , low-temperature humid raw gas at 5°C to 8°C is discharged from the first air outlet 1102 .

[0040] As an example, the cooling mechanism 11 is implemented as but not limited to a precooler or a heat exchanger.

[0041] The drying device for argon recovery includes a drying unit 20, and the drying unit 20 includes at least one drying mechanism 21. Each drying mechanism 21 includes an adsorption tower 211 and a first tube group 212. Each first tube group 212 includes an input pipe 2121 and an output pipe 2122, and each adsorption tower 211 is connected to one input pipe 2121 and one output pipe 2122. The adsorption tower 211 can adsorb water, and the low-temperature humid raw gas enters the adsorption tower 211 through the input pipe 2121. The water in the low-temperature humid raw gas is adsorbed by the adsorption tower 211, so that the low-temperature humid raw gas is dried, and then the dry raw gas is obtained, and the dry raw gas is discharged through the output pipe 2122.

[0042] It can be understood that the output pipe 2122 is connected to the recovery device 90, so that the dry raw gas discharged from the adsorption tower 211 enters the recovery device 90 through the output pipe 2122, so that the recovery device 90 recovers argon from the dry raw gas.

[0043] In one example, low-temperature humid raw gas at 5° C. to 8° C. enters the adsorption tower 211 through the input pipe 2121 , and after being dried by the adsorption tower 211 , dry raw gas at 20° C. to 40° C. is discharged from the output pipe 2122 .

[0044] In one embodiment, the input pipe 2121 is connected to the first gas outlet 1102 formed by the cooling mechanism 11 , and the low-temperature humid raw gas discharged from the first gas outlet 1102 flows to the adsorption tower 211 through the input pipe 2121 .

[0045] As a variant, the pretreatment unit 10 further includes a dehumidification mechanism 12, and the dehumidification mechanism 12 forms a second air inlet 1201, a second air outlet 1202, and a second drain 1203. The input pipe 2121 is connected to the second air outlet 1202 formed by the dehumidification mechanism 12. The second air inlet 1201 formed by the dehumidification mechanism 12 is connected to the first air outlet 1102 formed by the cooling mechanism 11 through a pipeline, and the low-temperature humid raw gas discharged from the first air outlet 1102 flows to the dehumidification mechanism 12 through the pipeline. The dehumidification mechanism 12 is configured to filter out water, and the low-temperature humid raw gas discharged from the cooling mechanism 11 has part of its water filtered out when it flows through the dehumidification mechanism 12. Liquid water is discharged from the second drain port 1203 formed by the dehumidification mechanism 12, and the low-temperature humid raw gas dried by the dehumidification mechanism 12 is discharged into the input pipe 2121 from the second gas outlet 1202 formed by the dehumidification mechanism 12, so as to further reduce the humidity of the low-temperature humid raw gas leading to the adsorption tower 211, thereby shortening the time for the adsorption tower 211 to dry the low-temperature humid raw gas.

[0046] As an example, the dehumidification mechanism 12 is implemented as a filter.

[0047] It is worth mentioning that each of the drying mechanisms 21 includes a first valve group 213, and each of the first valve groups 213 includes a first inlet control valve 2131 and a first outlet control valve 2132. The first inlet control valve 2131 is installed in the input pipe 2121, and is used to control the flow path and flow rate in the input pipe 2121. The first outlet control valve 2132 is installed in the output pipe 2122, and is used to control the flow path and flow rate in the output pipe 2122.

[0048] Furthermore, the drying device for argon recovery includes a heating mechanism 30 .

[0049] The heating mechanism 30 includes a heating device body 31 and an air inlet pipe 32. The air inlet pipe 32 is connected to the heating device body 31, and the low-temperature humid raw gas enters the heating device body 31 through the air inlet pipe 32. The heating device body 31 can heat the low-temperature humid raw gas during operation to obtain the high-temperature humid raw gas.

[0050] Preferably, the low-temperature humid raw gas is heated to 200° C. to 220° C. by the heating device body 31 .

[0051] In one embodiment, the air inlet pipe 32 is connected to the first air outlet 1102 formed by the cooling mechanism 11 , and the low-temperature humid raw gas discharged from the first air outlet 1102 flows to the heating device body 31 through the air inlet pipe 32 .

[0052] In another embodiment, the air inlet pipe 32 is connected to the second air outlet 1202 formed by the dehumidification mechanism 12 , and the low-temperature humid raw gas discharged from the second air outlet 1202 flows to the heating device body 31 through the air inlet pipe 32 .

[0053] Each of the first tube groups 212 further includes an air delivery pipe 2123 and an exhaust pipe 2124. Each of the adsorption towers 211 is connected to one of the air delivery pipes 2123 and one of the exhaust pipes 2124, and the air delivery pipe 2123 is connected to the heating device body 31 and the adsorption tower 211. The high-temperature and humid raw gas discharged from the heating device body 31 enters the adsorption tower 211 through the air delivery pipe 2123, and the high-temperature and humid raw gas purges the adsorption tower 211, so that the moisture adsorbed in the adsorption tower 211 is desorbed, and the high-temperature and humid raw gas and water vapor after the purge are discharged from the exhaust pipe 2124 as waste gas.

[0054] The adsorption tower 211 forms at least one inlet and outlet 21101, and the dry raw gas or / and the low-temperature humid raw gas enters the adsorption tower 211 through the inlet and outlet 21101, and the dry raw gas or / and the low-temperature humid raw gas purges the adsorption tower 211 purged by the high-temperature humid raw gas to reduce the temperature in the adsorption tower 211. Since the adsorption capacity of the adsorption tower 211 at high temperature is weak, the adsorption capacity of the adsorption tower 211 after being purged by the dry raw gas or / and the low-temperature humid raw gas gradually recovers, and then the adsorption tower 211 is regenerated. The purged dry raw gas or / and the low-temperature humid raw gas and the replaced high-temperature humid raw gas are discharged from the discharge pipe 2124 as waste gas.

[0055] In one example, the heating device body 31 is implemented as a heat exchanger.

[0056] In one embodiment, the gas delivery pipe 2123 is connected to the inlet and outlet 21101 formed by the adsorption tower 211. The low-temperature humid raw gas discharged from the pretreatment unit 10 flows through the inlet pipe 32, passes through the heating device body 31 in a shutdown state, and flows from the gas delivery pipe 2123 to the adsorption tower 211, so that the low-temperature humid raw gas purges the adsorption tower 211 purged with the high-temperature humid raw gas, so that the adsorption tower 211 is regenerated.

[0057] It is worth mentioning that the first valve group 213 includes a second inlet control valve 2133 and a second outlet control valve 2134. The second inlet control valve 2133 is installed in the gas delivery pipe 2123, and is used to control the flow path and flow rate in the gas delivery pipe 2123. The second outlet control valve 2134 is installed in the discharge pipe 2124, and is used to control the flow path and flow rate in the discharge pipe 2124.

[0058] Preferably, the drying mechanism 21 further comprises a temperature detection element 214. The temperature detection element 214 is installed in the adsorption tower 211 to detect the temperature inside the adsorption tower 211, so as to determine whether the adsorption tower 211 has been regenerated according to the temperature inside the adsorption tower 211.

[0059] In one example, high-temperature humid raw gas enters the adsorption tower 211 through the gas pipe 2123. When the temperature in the adsorption tower 211 reaches 115°C to 125°C, the introduction of high-temperature humid raw gas into the adsorption tower 211 is stopped; then dry raw gas and / or low-temperature humid raw gas is introduced into the adsorption tower 211. When the temperature of the adsorption tower 211 drops to 20°C to 40°C, the adsorption tower 211 completes regeneration.

[0060] As an example, the temperature detecting member 214 is implemented as, but not limited to, a thermometer.

[0061] Furthermore, the drying device for argon recovery also includes a recovery unit 40 .

[0062] The recovery unit 40 includes a recovery mechanism 41 and a reflux pipe 42, and the reflux pipe 42 is connected to the input pipe 2121 and the recovery mechanism 41. The discharge pipe 2124 is connected to the recovery mechanism 41, and the exhaust gas discharged from the adsorption tower 211 enters the recovery mechanism 41 through the discharge pipe 2124. The recovery mechanism 41 is used to remove part of the moisture in the exhaust gas, and the exhaust gas with part of the moisture removed is discharged to the adsorption tower 211 through the reflux pipe 42, so that the exhaust gas with part of the moisture removed discharged from the recovery mechanism 41 can be dried again by the adsorption tower 211, and then the argon in the exhaust gas is recovered to avoid the loss of argon.

[0063] Specifically, the recovery mechanism 41 includes a cooling member 411, and the cooling member 411 forms a third air inlet 41101, a third air outlet 41102, and a third drain 41103. The third air inlet 41101 formed by the cooling member 411 is connected to the exhaust pipe 2124, and the exhaust gas enters the cooling member 411 through the third air inlet 41101. The cooling member 411 is used to reduce the temperature of the exhaust gas. After the temperature is reduced, the water in the exhaust gas is converted from gas to liquid, and the liquid water is discharged from the third drain 41103 formed by the cooling member 411, and the low-temperature exhaust gas is discharged from the third air outlet 41102, so that the humidity of the low-temperature exhaust gas is reduced.

[0064] In one embodiment, the third gas outlet 41102 formed by the cooling component 411 is connected to the reflux pipe 42 , and the low-temperature exhaust gas discharged from the third gas outlet 41102 flows toward the adsorption tower 211 through the reflux pipe 42 .

[0065] As a deformable method, the recovery mechanism 41 also includes a dehydration member 412. The dehydration member 412 forms a fourth air inlet 41201, a fourth air outlet 41202 and a fourth drain port 41203. The reflux pipe 42 is connected to the fourth air outlet 41202 formed by the dehydration member 412. The fourth air inlet 41201 formed by the dehydration member 412 is connected to the third air outlet 41102 formed by the cooling member 411 through a pipeline, and the low-temperature exhaust gas discharged from the third air outlet 41102 flows to the dehydration member 412 through the pipeline. The dehydration member 412 is configured to filter out water, and the low-temperature exhaust gas passes through the dehydration member 412 to remove part of the water before flowing to the adsorption tower 211, thereby reducing the humidity of the low-temperature exhaust gas leading to the adsorption tower 211. Liquid water is discharged from the fourth drain port 41203 formed by the dehydration component 412, and the low-temperature exhaust gas dried by the dehydration component 412 is discharged from the fourth exhaust port 41202 formed by the dehydration component 412, and passes through the reflux pipe 42 to the adsorption tower 211, so that the dried low-temperature exhaust gas is further dried by the adsorption tower 211.

[0066] As an example, the cooling component 411 is implemented as but not limited to a pre-cooler or a heat exchanger, etc.; the dehydration component 412 is implemented as a filter.

[0067] It is worth mentioning that when the drying unit 20 is provided with only one drying mechanism 21, the recovery unit 40 further includes a temporary storage tank 43, and the temporary storage tank 43 is provided on the reflux pipe 42. The low-temperature exhaust gas dried by the dehydration component 412 is discharged from the fourth gas outlet 41202 formed by the dehydration component 412 and temporarily stored in the temporary storage tank 43 through a pipeline. When the adsorption tower 211 is converted into a dry state, the low-temperature exhaust gas stored in the temporary storage tank 43 flows to the adsorption tower 211.

[0068] Preferably, the drying unit 20 is provided with two groups of drying mechanisms 21. Each of the adsorption towers 211 has a drying state and a regeneration state, and the two groups of drying mechanisms 21 operate in parallel. When one of the adsorption towers 211 is in a drying state, the other of the adsorption towers 211 is in a regeneration state. After the two towers are switched, the adsorption tower 211 originally in a drying state is converted into a regeneration state, and the adsorption tower 211 originally in a regeneration state is converted into a drying state. By switching between the two adsorption towers 211, the drying device for argon recovery can continuously dry the low-temperature humid raw gas to continuously produce dry raw gas, thereby improving the efficiency of the drying device for argon recovery in drying the low-temperature humid raw gas and ensuring that the recovery equipment 90 can operate continuously.

[0069] In another embodiment, the gas pipe 2123 connected to the adsorption tower 211 is connected to the inlet and outlet 21101 formed by another adsorption tower 211. The dry raw gas discharged from the output pipe 2122 connected to the adsorption tower 211 in the dry state enters the adsorption tower 211 in the regeneration state through the gas pipe 2123 connected to the adsorption tower 211 in the regeneration state, so that the dry raw gas purges the adsorption tower 211 purged with the high-temperature humid raw gas, so that the adsorption tower 211 is regenerated. In order to facilitate those skilled in the art to understand the following technical solutions, the subsequent content is explained based on the connection between the gas pipe 2123 and the inlet and outlet 21101 formed by the adsorption tower 211.

[0070] Specifically, part of the low-temperature humid raw gas discharged from the pretreatment unit 10 enters the adsorption tower 211 in a dry state through the input pipe 2121 connected to the adsorption tower 211 in a dry state, and the moisture in the low-temperature humid raw gas is adsorbed by the adsorption tower 211 in a dry state to obtain dry raw gas, and the dry raw gas is discharged from the output pipe 2122 connected to the adsorption tower 211 in a dry state to the recovery equipment 90, so that the recovery equipment 90 can recover argon.

[0071] At the same time, part of the low-temperature humid raw gas discharged from the pretreatment unit 10 enters the heating device body 31 through the air inlet pipe 32, and the heating device body 31 heats the low-temperature humid raw gas into high-temperature humid raw gas. The high-temperature humid raw gas enters the adsorption tower 211 in the regeneration state through the gas delivery pipe 2123 connected to the adsorption tower 211 in the regeneration state, and the high-temperature humid raw gas is purged to desorb the moisture adsorbed by the adsorption tower 211 in the regeneration state. The purged high-temperature humid raw gas and water vapor are discharged as waste gas from the discharge pipe 2124 connected to the adsorption tower 211 in the regeneration state to the recovery unit 40. After the adsorption tower 211 in the regeneration state reaches a predetermined temperature, the heating device body 31 stops operating, so that the low-temperature humid raw gas enters the adsorption tower 211 in the regeneration state through the gas supply pipe 2123 connected to the adsorption tower 211 in the regeneration state, and the low-temperature humid raw gas purges and reduces the temperature inside the adsorption tower 211 in the regeneration state, so that the adsorption tower 211 in the regeneration state gradually restores its adsorption capacity, and the low-temperature humid raw gas and the replaced high-temperature humid raw gas are also discharged as waste gas from the exhaust pipe 2124 connected to the adsorption tower 211 in the regeneration state to the recovery unit 40.

[0072] At the same time, the exhaust gas enters the recovery mechanism 41 from the exhaust pipe 2124 in the regeneration state, so that the exhaust gas is dried by the recovery mechanism 41. The dried exhaust gas enters the adsorption tower 211 in the dry state through the reflux pipe 42 and the input pipe 2121 connected to the adsorption tower 211 in the dry state, so that the argon in the exhaust gas can be recovered.

[0073] Furthermore, the drying unit 20 also includes a pressure equalizing pipe 22 and a pressure control valve 23. The pressure equalizing pipe 22 connects the two adsorption towers 211. The pressure control valve 23 is installed on the pressure equalizing pipe 22 to control the flow path of the pressure equalizing pipe 22 and the flow rate. Before the two towers are switched, part of the dry raw gas discharged from the adsorption tower 211 in the drying state can enter the adsorption tower 211 in the regeneration state through the pressure equalizing pipe 22 to balance the pressure in the two towers, so as to ensure that the drying device for argon recovery can be switched and operated smoothly later.

[0074] The present application also provides a working method of the drying device for argon recovery, comprising the following steps:

[0075] (1) Pretreatment operation: The medium-temperature humid raw gas is introduced into the pretreatment unit 10, and the pretreatment unit 10 cools the medium-temperature humid raw gas to precipitate part of water and obtain low-temperature humid raw gas.

[0076] (1.1) The medium-temperature moist raw gas enters the cooling mechanism 11 through the first air inlet 1101 , and is cooled by the cooling mechanism 11 to obtain low-temperature moist raw gas, which is then discharged from the first air outlet 1102 .

[0077] As a variant, it also includes (1.2), the low-temperature humid raw gas is discharged from the first gas outlet 1102 to the dehumidification mechanism 12, part of the water is filtered out of the low-temperature humid raw gas when flowing through the dehumidification mechanism 12, and the low-temperature humid raw gas is discharged from the second gas outlet 1202.

[0078] (2) Drying operation: The low-temperature humid raw gas enters the adsorption tower 211 through the input pipe 2121, so that the moisture in the low-temperature humid raw gas is adsorbed by the adsorption tower 211, thereby obtaining dry raw gas, and the dry raw gas enters the recovery device 90 from the output pipe 2122.

[0079] (3) Regeneration operation: close the first control inlet valve 2131 to stop the low-temperature humid raw gas from entering the adsorption tower 211.

[0080] (3.1) The low-temperature humid raw gas enters the heating device body 31 through the air inlet pipe 32. The heating device body 31 heats the low-temperature humid raw gas to obtain high-temperature humid raw gas. The high-temperature humid raw gas enters the adsorption tower 211 from the gas transmission pipe 2123, so that the moisture adsorbed in the adsorption tower 211 is desorbed, and the high-temperature humid raw gas and water vapor are discharged from the exhaust pipe 2124 as exhaust gas.

[0081] In one embodiment, the low-temperature humid raw gas discharged from the first gas outlet 1102 flows to the heating device body 31 and the adsorption tower 211 through the gas inlet pipe 32 and the input pipe 2121 respectively.

[0082] In another embodiment, the low-temperature humid raw gas discharged from the first gas outlet 1102 flows to the dehumidification mechanism 12 through a pipeline, and the low-temperature humid raw gas discharged from the second gas outlet 1202 formed by the dehumidification mechanism 12 flows to the heating equipment body 31 and the adsorption tower 211 respectively through the air inlet pipe 32 and the input pipe 2121.

[0083] (3.2) The dry raw gas and / or the low-temperature humid raw gas enters the adsorption tower 211 through the inlet and outlet 21101, and the dry raw gas and / or the low-temperature humid raw gas purges the adsorption tower 211 that has been purged with the high-temperature humid raw gas. The dry raw gas and / or the low-temperature humid raw gas and the replaced high-temperature humid raw gas are discharged from the exhaust pipe 2124 as waste gas.

[0084] (4) Recovery operation: The waste gas is discharged from the discharge pipe 2124 into the recovery mechanism 41, and the recovery mechanism 41 cools the waste gas to precipitate part of the water and obtain low-temperature waste gas.

[0085] (4.1) The exhaust gas enters the cooling member 411 from the exhaust pipe 2124 , and the cooling member 411 reduces the temperature of the exhaust gas. Liquid water is discharged from the third drain port 41103 formed by the cooling member 411 , and the low-temperature exhaust gas is discharged from the third outlet port 41102 .

[0086] In one embodiment, the low-temperature exhaust gas discharged from the third gas outlet 41102 flows through the reflux pipe 42 to the adsorption tower 211 performing the drying operation.

[0087] As a variant, it further includes (4.2), the low-temperature exhaust gas discharged from the third gas outlet 41102 flows to the dehydration component 412 through a pipeline, and part of the water is filtered out of the low-temperature exhaust gas when flowing through the dehydration component 412. The dried low-temperature exhaust gas is discharged from the fourth gas outlet 41202 formed by the dehydration component 412, and passes through the reflux pipe 42 to the adsorption tower 211 performing the drying operation.

[0088] It can be understood by those skilled in the art that, compared with the prior art, the present application adopts low-temperature humid raw gas and high-temperature humid raw gas as the regeneration gas of the adsorption tower 211 to regenerate the adsorption tower 211, thereby avoiding the introduction of air into the adsorption tower 211 when the adsorption tower 211 is regenerated.

[0089] Preferably, one of the adsorption towers 211 is performing a drying operation, while the other adsorption tower 211 is performing a regeneration operation. The two adsorption towers 211 cyclically perform a drying operation and a regeneration operation.

[0090] It is worth mentioning that the low-temperature exhaust gas discharged from the recovery mechanism 41 flows from the reflux pipe 42 to the adsorption tower 211 performing the drying operation, so that the low-temperature exhaust gas is dried by the adsorption tower 211 performing the drying operation.

[0091] In one embodiment, the low-temperature humid raw gas discharged from the pretreatment unit 10 flows through the air inlet pipe 32, passes through the heating device body 31 in the shutdown state, and flows from the air delivery pipe 2123 to the adsorption tower 211 in the regeneration state.

[0092] As a variant, the dry raw gas discharged from the output pipe 2122 connected to the adsorption tower 211 performing the drying operation enters the adsorption tower 211 in the regenerating state through the gas delivery pipe 2123 connected to the adsorption tower 211 in the regenerating state.

[0093] It should be understood by those skilled in the art that the embodiments of the present application described above and shown in the accompanying drawings are only examples and do not limit the present application. The advantages of the present application have been fully and effectively realized. The functions and structural principles of the present application have been demonstrated and explained in the embodiments, and the embodiments of the present application may be deformed or modified in any way without departing from the principles.

Claims

1. A drying device for argon recovery, characterized in that: The drying device for argon recovery comprises: A drying unit, wherein the drying unit comprises at least one drying mechanism, each of the drying mechanisms comprises an adsorption tower and a first tube group, each of the first tube groups comprises an input tube, an output tube, a gas transmission tube and a discharge tube, the adsorption tower is connected to the input tube, the output tube, the gas transmission tube and the discharge tube, the low-temperature humid raw gas enters the adsorption tower through the input tube, the adsorption tower can adsorb water, the water in the low-temperature humid raw gas is adsorbed by the adsorption tower, and dry raw gas is obtained, the output tube is connected to a recovery device, and the dry raw gas discharged from the adsorption tower enters the recovery device through the output tube; A heating mechanism, wherein the heating mechanism comprises a heating device body and an air inlet pipe, wherein the air inlet pipe is connected to the heating device body, and low-temperature humid raw gas enters the heating device body through the air inlet pipe, and the heating device body can heat the low-temperature humid raw gas during operation to obtain high-temperature humid raw gas, wherein the air delivery pipe is connected to the heating device body and the adsorption tower, and the high-temperature humid raw gas discharged from the heating device body enters the adsorption tower through the air delivery pipe, and the purged high-temperature humid raw gas and water vapor are discharged from the discharge pipe as waste gas, and an inlet and outlet are formed in the adsorption tower, and dry raw gas and / or low-temperature humid raw gas enter the adsorption tower through the inlet and outlet, and the purged dry raw gas and / or low-temperature humid raw gas and the replaced high-temperature humid raw gas are discharged from the discharge pipe as waste gas; The recovery unit includes a recovery mechanism and a reflux pipe, the reflux pipe is connected to the input pipe and the recovery mechanism, the discharge pipe is connected to the recovery mechanism, the waste gas discharged from the adsorption tower enters the recovery mechanism through the discharge pipe, the recovery mechanism is used to remove part of the moisture in the waste gas, and the waste gas with part of the moisture removed is discharged to the adsorption tower through the reflux pipe.

2. The drying device for argon recovery according to claim 1, characterized in that: The recovery mechanism includes a cooling component and a dehydration component, the cooling component forms a third air inlet, a third air outlet and a third drain, the dehydration component forms a fourth air inlet, a fourth air outlet and a fourth drain, the third air inlet formed by the cooling component is connected to the discharge pipe, the exhaust gas enters the cooling component through the third air inlet, the cooling component is used to reduce the temperature of the exhaust gas, and water in the exhaust gas is discharged from the third drain formed by the cooling component, the reflux pipe is connected to the fourth air outlet formed by the dehydration component, the fourth air inlet formed by the dehydration component is connected to the third air outlet formed by the cooling component through a pipeline, the dehydration component is configured to filter out water, the low-temperature exhaust gas discharged from the third air outlet flows to the dehydration component through a pipeline, the low-temperature exhaust gas dried by the dehydration component is discharged from the fourth air outlet formed by the dehydration component, and passes through the reflux pipe to the adsorption tower, and water is discharged from the fourth drain formed by the dehydration component.

3. The drying device for argon recovery according to claim 2, characterized in that: The drying mechanism further includes a temperature detection component, which is installed in the adsorption tower to detect the temperature in the adsorption tower.

4. The drying device for argon recovery according to claim 3, characterized in that: The drying device for argon recovery includes a pretreatment unit, which includes a cooling mechanism and a dehumidification mechanism. The cooling mechanism forms a first air inlet, a first air outlet and a first drain. The medium-temperature humid raw gas enters the cooling mechanism through the first air inlet. The cooling mechanism is used to reduce the temperature of the medium-temperature humid raw gas and obtain low-temperature humid raw gas. Part of the water is discharged from the first drain formed by the cooling mechanism, and the low-temperature humid raw gas is discharged from the first air outlet. The dehumidification mechanism forms a second air inlet, a second air outlet and a second drain. The input pipe and the air inlet pipe are connected to the second air outlet formed by the dehumidification mechanism. The second air inlet formed by the dehumidification mechanism is connected to the first air outlet formed by the cooling mechanism through a pipeline. The low-temperature humid raw gas discharged from the first air outlet flows to the dehumidification mechanism through a pipeline. The dehumidification mechanism is configured to filter out water, and the water is discharged from the second drain formed by the dehumidification mechanism. The low-temperature humid raw gas dried by the dehumidification mechanism is discharged from the second air outlet formed by the dehumidification mechanism into the input pipe and the air inlet pipe.

5. The drying device for argon recovery according to claim 4, characterized in that: The drying unit is provided with two groups of the drying mechanisms, one of the adsorption towers is drying while the other adsorption tower is regenerating.

6. The drying device for argon recovery according to claim 5, characterized in that: The gas delivery pipe is connected to the inlet and outlet formed by the adsorption tower, and the low-temperature humid raw gas flows through the heating device body in a shutdown state through the gas inlet pipe and flows from the gas delivery pipe to the adsorption tower.

7. The drying device for argon recovery according to claim 5 or 6, characterized in that: The gas pipeline connected to the adsorption tower is connected to the inlet and outlet formed by another adsorption tower, and the dry raw gas discharged from the output pipe connected to the adsorption tower in the dry state enters the adsorption tower in the regenerated state through the gas pipeline connected to the adsorption tower in the regenerated state.

8. The working method of the drying device for argon recovery according to any one of claims 1 to 7, characterized in that: include: The low-temperature humid raw gas enters the adsorption tower through the input pipe, the moisture in the low-temperature humid raw gas is adsorbed by the adsorption tower, and dry raw gas is obtained, and the dry raw gas enters the recovery device from the output pipe; Stop feeding the low-temperature humid raw gas into the adsorption tower, the low-temperature humid raw gas enters the heating device body through the air inlet pipe, the heating device body heats the low-temperature humid raw gas and obtains high-temperature humid raw gas, the high-temperature humid raw gas is fed into the adsorption tower from the air delivery pipe, the water adsorbed in the adsorption tower is desorbed, and the high-temperature humid raw gas and water vapor are discharged from the discharge pipe as waste gas; The dry raw gas and / or the low-temperature humid raw gas enters the adsorption tower through the inlet and outlet, the dry raw gas and / or the low-temperature humid raw gas purges the adsorption tower after being purged by the high-temperature humid raw gas, and the dry raw gas and / or the low-temperature humid raw gas and the replaced high-temperature humid raw gas are discharged from the discharge pipe as waste gas; The waste gas is discharged from the discharge pipe into the recovery mechanism, and the waste gas is cooled by the recovery mechanism to precipitate part of water and obtain low-temperature waste gas.

9. The working method of the drying device for argon recovery according to claim 8, characterized in that: The exhaust gas enters the cooling component from the discharge pipe, and the cooling component reduces the temperature of the exhaust gas. Liquid water is discharged from the third drain port formed by the cooling component, and the low-temperature exhaust gas is discharged from the third outlet. The low-temperature exhaust gas discharged from the third outlet flows to the dehydration component through a pipeline. Part of the water is filtered out of the low-temperature exhaust gas when flowing through the dehydration component. The dried low-temperature exhaust gas is discharged from the fourth outlet formed by the dehydration component and passes through the reflux pipe to the adsorption tower in a dry state.

10. The working method of the drying device for argon recovery according to claim 9, characterized in that: When one of the adsorption towers is in a dry state and the other adsorption tower is in a regeneration state, the two adsorption towers switch between the dry state and the regeneration state, and the low-temperature exhaust gas discharged from the recovery mechanism flows from the reflux pipe to the adsorption tower in the dry state.

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