Helium neon extraction device

Abstract

This application discloses a helium-neon extraction apparatus, which includes a heat exchanger, a raw material compressor, a first distillation column, and a second condenser. The first cold-end inlet of the heat exchanger is connected to the gas phase outlet of the first condenser, used to receive the raw material gas output from the first condenser and reheat the raw material gas. The inlet of the raw material compressor is connected to the first hot-end outlet of the heat exchanger, and the outlet is connected to the first hot-end inlet of the heat exchanger. The raw material compressor is used to compress the raw material gas and send the compressed raw material gas into the heat exchanger for cooling. The first inlet of the first distillation column is connected to the first cold-end outlet of the heat exchanger, used to perform distillation treatment on the raw material gas. The inlet of the second condenser is connected to the first outlet of the first distillation column, used to condense the first-stage gas output from the first distillation column, obtaining crude helium-neon gas at the first outlet of the second condenser. Through the above method, this application can improve the efficiency of extracting helium and neon.

Description

Technical Field

[0001] This application relates to the field of air separation technology, and in particular to a helium-neon extraction device. Background Technology

[0002] Helium and neon are rare gases found in the air, belonging to the inert gas family and possessing stable chemical properties. Helium is a colorless, odorless, tasteless, and non-flammable gas, widely used in low-temperature physics, medicine, aerospace, and other fields. Neon is primarily used in the manufacture of neon lights and also has applications in some high-end scientific research. Although helium and neon are present in relatively low concentrations in the air, they play a crucial role in modern technology and industry. During its long-term research and development process, the applicant of this application discovered that the efficiency of extracting helium and neon from air separation devices is low, and the modification time for these devices is lengthy. Summary of the Invention

[0003] The main technical problem addressed by this application is to provide a helium-neon extraction device that can improve the efficiency of extracting helium and neon.

[0004] To solve the above-mentioned technical problems, this application adopts the following technical solution: A helium-neon extraction device is provided, connected to an air separation device. The air separation device includes a first condenser, and the air, after rectification, is connected to the first condenser for condensation. The helium-neon extraction device includes: a heat exchanger with a first cold-end inlet connected to the gas phase outlet of the first condenser, used to receive the raw material gas output from the first condenser and reheat the raw material gas, wherein the raw material gas includes a mixture of helium and neon; a raw material compressor with an inlet connected to the first hot-end outlet of the heat exchanger and an outlet connected to the first hot-end inlet of the heat exchanger, used to compress the reheated raw material gas and send the compressed raw material gas into the heat exchanger for cooling; a first distillation column with a first inlet connected to the first cold-end outlet of the heat exchanger, used to rectify the cooled raw material gas; and a second condenser with an inlet connected to the first outlet of the first distillation column, used to condense the first-stage gas output from the first distillation column, obtaining crude helium-neon gas at the first outlet of the second condenser.

[0005] The helium-neon extraction device further includes a gas-liquid separator, with its inlet connected to the liquid phase outlet of the first condenser and its outlet connected to the first cold end inlet of the heat exchanger, for separating the raw material gas from the gas-liquid mixture.

[0006] It also includes: a first throttle valve, which is connected to the inlet of the gas-liquid separator and the liquid phase outlet of the first condenser, respectively, for throttling and reducing the pressure of the liquid output from the first condenser, so that the gas-liquid mixture containing the raw material gas is introduced into the inlet of the gas-liquid separator.

[0007] The second outlet of the second condenser is also connected to the second inlet of the first distillation column, for conveying reflux liquid to the first distillation column.

[0008] The bottom outlet of the first distillation column is connected to the second cold end inlet of the heat exchanger, and the second cold end outlet of the heat exchanger is connected to the cooling inlet of the second condenser. The heat exchanger is used to deeply cool the liquid nitrogen at the bottom of the first distillation column and send the cooled liquid nitrogen into the second condenser as the coolant for the second condenser.

[0009] The evaporation outlet of the second condenser is connected to the third cold end inlet of the heat exchanger, which is used to reheat the nitrogen gas discharged from the evaporation outlet to recover the cold energy.

[0010] The evaporation outlet of the second condenser is connected to the gas phase outlet of the gas-liquid separator, and a valve is provided between the evaporation outlet and the gas phase outlet to allow the air separation device to recover the cooling capacity of the nitrogen discharged from the evaporation outlet.

[0011] The helium-neon extraction device further includes a storage tank with its inlet connected to the first hot end outlet of the heat exchanger, used to store the raw material gas and discharge the raw material gas at a stable flow rate to the heat exchanger.

[0012] The cooling inlet of the second condenser is also used to receive external liquid nitrogen, which is used to provide cooling for the helium-neon extraction device.

[0013] The first cold end inlet of the heat exchanger is connected to the gas phase outlet of the first condenser in one of the multiple air separation devices.

[0014] The beneficial effects of this application are as follows: Unlike the prior art, this application modifies the air separation device by setting up a heat exchanger, a raw material compressor, a first distillation column, and a second condenser to process the raw material gas delivered by the air separation device to obtain crude helium-neon gas. By adding a helium-neon extraction device to the first condenser, the air separation device is equipped with the function of extracting helium-neon gas, thereby improving the efficiency of extracting helium and neon. Moreover, the modification is simple, reduces the modification time of the air separation device, and improves the modification efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0016] Figure 1 This is a schematic diagram of one embodiment of the helium-neon extraction device of this application;

[0017] Figure 2 This is a schematic diagram of another embodiment of the helium-neon extraction device of this application;

[0018] Figure 3 This is a schematic diagram of another embodiment of the helium-neon extraction device of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] See Figure 1 The helium-neon extraction device 100 includes a heat exchanger 1, a raw material compressor 2, a first distillation column 3, and a second condenser 4. The helium-neon extraction device 100 is connected to an air separation device 200, which includes a first condenser 210. After air distillation, it is connected to the first condenser 210 for condensation treatment.

[0021] The first cold end inlet 11 of the heat exchanger 1 is connected to the gas phase outlet 211 of the first condenser 210, and is used to receive the raw material gas output from the first condenser 210 and reheat the raw material gas, wherein the raw material gas includes a gas mixture of helium and neon.

[0022] Specifically, the sources of the raw material gas include the main non-condensable gas discharged from the gas phase outlet 211 of the first condenser 210 of the air separation device 200, or the gas after liquid throttling and flash separation in the vapor-liquid separator 5 discharged from the liquid phase outlet 212 of the first condenser 210. The raw material gas from both sources includes helium and neon, and is collectively referred to as the raw material gas. The heat exchanger 1 receives the raw material gas output from the gas phase outlet 211 of the first condenser 210 in the air separation device 200 and reheats the raw material gas.

[0023] The inlet of the raw material compressor 2 is connected to the first hot end outlet 12 of the heat exchanger 1, and the outlet of the raw material compressor 2 is connected to the first hot end inlet 13 of the heat exchanger 1. The raw material compressor 2 is used to compress the reheated raw material gas and send the compressed raw material gas into the heat exchanger 1 for cooling.

[0024] Specifically, the raw material compressor 2 compresses the raw material gas, increases its pressure, and further cools it to lower its temperature, thus facilitating its distillation.

[0025] The first inlet 31 of the first distillation column 3 is connected to the first cold end outlet 14 of the heat exchanger 1, and is used to distill the cooled raw material gas.

[0026] Specifically, the first distillation column 3 obtains the raw material gas cooled by the heat exchanger 1, and performs distillation on the raw material gas. By taking advantage of the different boiling points of helium, neon and nitrogen in the raw material gas, the nitrogen in the raw material gas is liquefied, liquid nitrogen is obtained at the bottom of the first distillation column 3, and a primary gas rich in helium and neon is obtained at the top of the first distillation column 3.

[0027] The inlet 41 of the second condenser 4 is connected to the first outlet 33 of the first distillation column 3, and is used to condense the first-stage gas output from the first distillation column 3, so that crude helium-neon gas is obtained at the first outlet 42 of the second condenser 4.

[0028] Specifically, the second condenser 4 obtains the helium- and neon-rich primary gas output from the top of the first distillation column 3, condenses the primary gas, and obtains crude helium- and neon gas at the first outlet 42 of the second condenser 4.

[0029] In this application, the air separation device 200 is modified by setting up a heat exchanger 1, a raw material compressor 2, a first distillation column 3, and a second condenser 4 to process the raw material gas delivered by the air separation device 200 to obtain crude helium-neon gas. By adding a helium-neon extraction device 100 to the first condenser 210 in the air separation device 200, the air separation device 200 is equipped with the function of extracting helium-neon gas, thereby improving the efficiency of extracting helium and neon. Moreover, the modification points of the helium-neon extraction device 100 and the air separation device 200 are few, simplifying the modification steps, reducing the modification difficulty, reducing the modification time of the air separation device 200, and improving the modification efficiency.

[0030] Continue reading Figure 1 The helium-neon extraction device 100 also includes a gas-liquid separator 5. The inlet 51 of the gas-liquid separator 5 is connected to the liquid phase outlet 212 of the first condenser 210, and the outlet of the gas-liquid separator 5 is connected to the first cold end inlet 11 of the heat exchanger 1, for separating the raw material gas in the gas-liquid mixture.

[0031] Specifically, the liquid phase outlet 212 of the first condenser 210 outputs a mixed liquid containing helium, neon, and nitrogen. During the transport process, the mixed liquid partially vaporizes. The inlet 51 of the gas-liquid separator 5 obtains a gas-liquid mixture containing helium, neon, and liquid nitrogen. The gas-liquid separator 5 separates the gas mixture and outputs a raw material gas containing helium and neon at the gas phase outlet 52 of the gas-liquid separator 5. The raw material gas is then transported to the heat exchanger 1, where the heat exchanger 1 reheats the raw material gas.

[0032] In one embodiment, the pipe of the gas phase outlet 52 of the gas-liquid separator 5 is merged with the pipe of the gas phase outlet 211 of the first condenser 210. The merged pipe is connected to the first cold end inlet 11 of the heat exchanger 1, and the raw material gas output from the gas-liquid separator 5 and the first condenser 210 is jointly transported to the heat exchanger 1. The heat exchanger 1 heats the raw material gas from the two sources mentioned above.

[0033] Continue reading Figure 1 The helium-neon extraction device 100 also includes a first throttle valve 61, which is connected to the inlet 51 of the gas-liquid separator 5 and the liquid phase outlet 212 of the first condenser 210, respectively, for throttling and reducing the pressure of the liquid output from the first condenser 210, so that the gas-liquid mixture containing the raw material gas is introduced into the inlet 51 of the gas-liquid separator 5.

[0034] Specifically, the mixed liquid from the liquid phase outlet 212 of the first condenser 210 is depressurized after passing through the throttle valve 61, and part of the mixed liquid is vaporized and enters the gas-liquid separator 5 in a gas-liquid two-phase state. Helium and neon, as low-boiling-point components, will preferentially vaporize and exist in the gas phase of the two-phase mixture, thereby obtaining a gas-liquid mixture including the raw material gas. The gas-liquid mixture is then transported to the inlet 51 of the gas-liquid separator 5 through a pipeline.

[0035] In one embodiment, see further. Figure 1 The second outlet 43 of the second condenser 4 is also connected to the second inlet 32 ​​of the first distillation column 3 for conveying reflux liquid to the first distillation column 3.

[0036] Specifically, the second condenser 4 condenses the primary gas, and the gas obtained at the first outlet 42 of the second condenser 4 is crude helium-neon gas. The liquid obtained at the second outlet 43 of the second condenser 4 is a liquid mixture containing liquid nitrogen. The liquid mixture is then fed to the first distillation column 3 to be returned to the first distillation column 3 as reflux liquid.

[0037] In one embodiment, see further. Figure 1The bottom outlet 34 of the first distillation column 3 is connected to the second cold end inlet 15 of the heat exchanger 1, and the second cold end outlet 16 of the heat exchanger 1 is connected to the cooling inlet 44 of the second condenser 4. The heat exchanger 1 is used to deeply cool the liquid nitrogen at the bottom of the first distillation column 3 and send the cooled liquid nitrogen into the second condenser as the coolant for the second condenser 4.

[0038] Specifically, the bottom outlet 34 of the first distillation column 3 is sequentially connected to the second cold end inlet 15, the second cold end outlet 16 of the heat exchanger 1, and the cooling inlet 44 of the second condenser 4, so that the liquid nitrogen at the bottom of the first distillation column 3 is transported to the second condenser 4 after being deeply cooled by the heat exchanger 1, and the cooled liquid nitrogen is used as the coolant of the second condenser 4, thereby improving the utilization rate of liquid nitrogen.

[0039] In one embodiment, a second throttle valve 62 is provided between the second cold end outlet 16 of the heat exchanger 1 and the cooling inlet 44 of the second condenser 4. The liquid nitrogen is further cooled by the second throttle valve 62, and the liquid nitrogen is deeply cooled. The deeply cooled liquid nitrogen is used as the coolant of the second condenser 4, thereby improving the utilization rate of liquid nitrogen.

[0040] In one embodiment, see further. Figure 1 The evaporation outlet 45 of the second condenser 4 is connected to the third cold end inlet 17 of the heat exchanger 1. The heat exchanger 1 is used to reheat the nitrogen discharged from the evaporation outlet 45 to recover the cold energy.

[0041] Specifically, nitrogen is discharged from the evaporation outlet 45 of the second condenser 4, and nitrogen is obtained from the third cold end inlet 17 of the heat exchanger 1 and heated, so that room temperature nitrogen is discharged from the second hot end outlet 18 of the heat exchanger 1, thereby achieving the purpose of recovering cold energy.

[0042] In one embodiment, see further. Figure 1 The evaporation outlet 45 of the second condenser 4 is connected to the gas phase outlet 52 of the gas-liquid separator 5, and a valve 63 is provided between the evaporation outlet 45 and the gas phase outlet 52 so that the air separation device 200 can recover the cooling capacity of the nitrogen discharged from the evaporation outlet 45.

[0043] Specifically, when the helium-neon extraction unit 100 is in operation, valve 63 is closed, and nitrogen gas is output from the evaporation outlet 45 of the second condenser 4 to the air separator 200, bringing the cooling capacity of the nitrogen gas back to the air separator 200, thereby improving the utilization rate of the nitrogen cooling capacity. When the helium-neon extraction unit 100 is shut down, valve 63 is opened, and the raw material gas obtained from the gas phase outlet 52 of the gas-liquid separator 5 is discharged with the air separator 200.

[0044] In one embodiment, the first outlet 42 of the second condenser 4 is connected to the fourth cold end inlet 19 of the heat exchanger 1, which is used to heat the crude helium-neon gas and discharge the crude helium-neon gas from the heat exchanger 1.

[0045] See Figure 2 In one embodiment, the helium-neon extraction apparatus 100 further includes a storage tank 8. The inlet of the storage tank 8 is connected to the first hot end outlet 12 of the heat exchanger 1, for storing raw material gas and discharging a stable flow rate of raw material gas to the heat exchanger 1.

[0046] Specifically, the storage tank 8 receives the reheated raw material gas, collects a sufficient amount of raw material gas, and outputs it to the first hot end inlet 13 of the heat exchanger 1, so that the gas flow rate is stable when the raw material gas is transported. When the raw material gas comes from multiple air separation devices 200, since the amount of raw material gas discharged by each air separation device 200 is small and the flow rate is unstable, storing the raw material gas in the storage tank 8 first, and then performing distillation after reaching a certain storage amount, can improve the extraction efficiency of helium and neon.

[0047] See Figure 3 In one embodiment, the inlet of the air temperature heater 9 is connected to the gas phase outlet 211 of the first condenser 210 in the air separation device 200. That is, the air temperature heater 9 is used to replace the heat exchanger 1 to heat the raw material gas. In this embodiment, there are few connection points between the helium-neon extraction device and the air separation device 200, which makes it easy to modify and can be modified without stopping the air separation device 200.

[0048] In one embodiment, see further. Figure 2 and Figure 3 The cooling inlet 44 of the second condenser 4 is also used to receive external liquid nitrogen, which is used to provide cooling for the helium-neon extraction device 100.

[0049] Specifically, external liquid nitrogen is input into the cooling inlet 44 of the second condenser 4 to provide cooling capacity to the second condenser 4 and improve the condensation efficiency of the second condenser 4 for the primary gas.

[0050] Furthermore, a throttling valve is installed between the external liquid nitrogen injection pipe and the cooling inlet 44 of the second condenser 4 to further reduce the temperature of the external liquid nitrogen and improve the cooling quality of the external liquid nitrogen injection.

[0051] See Figure 1 and Figure 2 In one embodiment, the first cold end inlet 11 of the heat exchanger 1 is connected to the gas phase outlet 211 of the first condenser 210 of the plurality of air separation devices 200.

[0052] Specifically, the gas phase outlet 211 of the first condenser 210 in multiple air separation devices 200 is merged and connected to the first cold end inlet 11 of the heat exchanger 1. The main cold non-condensable gas in multiple air separation devices 200 is injected into the helium-neon extraction device 100 as raw material gas, so that multiple air separation devices 200 can share a single helium-neon extraction device 100, thereby improving the utilization rate of the helium-neon extraction device 100 and increasing the output of crude helium-neon gas.

[0053] In another embodiment, the liquid phase outlet 212 of the first condenser 210 in the multiple air separation devices 200 is connected to the inlet 51 of the gas-liquid separator 5, and the pipe of the gas phase outlet 52 of the gas-liquid separator 5 is connected to the first cold end inlet 11 of the heat exchanger 1. The raw material gas from the gas-liquid separator 5 in the multiple air separation devices 200 is transported to the helium-neon extraction device 100, thereby increasing the amount of raw material gas transported and enabling multiple air separation devices 200 to share a single helium-neon extraction device 100, thereby improving the utilization rate of the helium-neon extraction device 100 and increasing the production of crude helium-neon gas.

[0054] To better understand the scheme of this application, the following will be combined with... Figures 1 to 3 The scheme of this application is described in detail:

[0055] exist Figure 1 In the scheme, the gas phase outlet 211 of the first condenser 210 in the air separation device 200 outputs a main non-condensable gas including helium and neon, and the liquid phase outlet 212 of the first condenser 210 outputs a liquid mixture including helium, neon and nitrogen. The liquid phase outlet 212 of the first condenser 210 is connected to the inlet 51 of the gas-liquid separator 5 through a pipeline, and a first throttle valve 61 is installed on the connected pipeline. The liquid mixture is depressurized by the first throttle valve 61, and the liquid mixture is partially vaporized and enters the gas-liquid separator 5 in a gas-liquid two-phase state. Helium and neon, as low-boiling-point components, will preferentially vaporize and exist in the gas phase of the two-phase mixture. The gas-liquid mixture is processed by the gas-liquid separator 5 and discharged as a gas mixture including helium and neon at the gas phase outlet 52 of the gas-liquid separator 5.

[0056] The gas phase outlet 52 of the gas-liquid separator 5 is combined with the gas phase outlet 211 of the first condenser 210 in the air separation device 200, and the gases discharged from both are used as raw material gases. The raw material gases include helium and neon. The raw material gases enter the first cold end inlet 11 of the heat exchanger 1, and the coldness in the raw material gases is sent into the heat exchanger 1 to reheat the raw material gases. The reheated raw material gases are then sent out through the first hot end outlet 12.

[0057] The inlet of the raw material compressor 2 is connected to the first hot end outlet 12, so that the raw material compressor 2 receives the reheated raw material gas, the raw material compressor 2 compresses the raw material gas, thereby increasing the pressure of the raw material gas, and then sends it into the first hot end inlet 13 of the heat exchanger 1, where the heat exchanger 1 cools the raw material gas.

[0058] The first cold end outlet 14 of the heat exchanger 1 is connected to the first inlet 31 of the first distillation column 3. The cooled raw material gas enters the first distillation column 3, and the first distillation column 3 performs distillation treatment on the raw material gas. At the top of the first distillation column 3, a primary gas rich in helium and neon is obtained, and at the bottom of the first distillation column 3, liquid nitrogen is obtained.

[0059] The primary gas enters the inlet 41 of the second condenser 4 through the first outlet 33 of the first distillation column 3. The second condenser 4 condenses the primary gas, and the crude helium-neon gas is discharged through the first outlet 42 of the second condenser 4. The first outlet 42 of the second condenser 4 connects to the fourth cold end inlet 19 of the heat exchanger 1. The heat exchanger 1 reheats and rewarms the crude helium-neon gas. The portion of the feed gas that has been condensed into liquid passes through the second inlet 32 ​​of the first distillation column 3 and is used as reflux liquid in the first distillation column 3. At the same time, the bottom outlet 34 of the first distillation column 3 connects to the second cold end inlet 15 of the heat exchanger 1, and the gas flows out from the second cold end outlet 16 of the heat exchanger 1... The second throttle valve 62 is connected to the cooling inlet 44 of the second condenser 4. After the heat exchanger 1 deeply cools the liquid nitrogen, it is sent to the second condenser 4, where the liquid nitrogen is used as a coolant. During the process of condensing the raw material gas in the second condenser 4, the liquid nitrogen used as a coolant evaporates into nitrogen gas. Part of it is heated to become room temperature nitrogen gas, and the rest is returned to the air separator 200, where the cooling capacity is sent. A valve 63 is installed between the pipeline for returning nitrogen gas to the air separator 200 and the gas phase outlet 52 of the gas-liquid separator 5. When the valve 63 is closed, the helium-neon extraction device 100 operates, so that nitrogen gas does not mix into the raw material gas discharged from the gas phase outlet 52 of the gas-liquid separator 5.

[0060] exist Figure 2In the scheme, the gas phase outlet 211 of the first condenser 210 in the air separation device 200 outputs a main cold non-condensable gas including helium and neon. The main cold non-condensable gas is used as the raw material gas. After the heat exchanger 1 heats the raw material gas, it is sent to the storage tank 8. After storing a certain amount of raw material gas, the storage tank 8 discharges raw material gas with a stable flow rate and sends it to the raw material compressor 2. After the raw material compressor 2 compresses the raw material gas, it is sent to the heat exchanger 1 for cooling. The first distillation column 3 distills the cooled raw material gas. At the top of the first distillation column 3, a primary gas rich in helium and neon is obtained, and at the bottom of the first distillation column 3, liquid nitrogen is obtained. After being deeply cooled by the heat exchanger 1, the liquid nitrogen is sent to the cooling inlet 44 of the second condenser 4 through the second throttle valve 62. At the same time, external liquid nitrogen can also be sent into the second condenser 4 through the cooling inlet 44.

[0061] The second condenser 4 condenses the primary gas, and crude helium-neon gas is obtained at the first outlet 42 of the second condenser 4. The portion that is condensed into liquid is discharged through the second outlet 43 of the second condenser 4 and sent as reflux liquid to the second inlet 32 ​​of the first distillation column 3.

[0062] Figure 2 and Figure 1 The difference between the two solutions is that, Figure 2 The source of the raw material gas in the helium-neon extraction device 100 is mainly cold non-condensable gas, and... Figure 1 Compared with the previous scheme, this scheme has fewer connection points between the helium-neon extraction device 100 and the air separation device 200, making it easier to modify, and the air separation device 200 does not need to be shut down during the modification.

[0063] exist Figure 3 In the plan, with Figure 2 The difference between the two schemes is that the raw material gas in the air separator 200 is heated by the air temperature controller 9, and the crude helium-neon gas is heated by the air temperature controller 9. The operation is simpler, and the rest of the process is the same, so it will not be described in detail here.

[0064] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A helium-neon extraction device, used to connect to an air separation device, the air separation device including a first condenser, wherein air is distilled and then fed into the first condenser for condensation treatment, characterized in that, The helium-neon extraction device includes: The heat exchanger has a first cold end inlet connected to the gas phase outlet of the first condenser, used to receive the raw material gas output from the first condenser and reheat the raw material gas, wherein the raw material gas includes a gas mixture of helium and neon. The raw material compressor has an inlet connected to the first hot end outlet of the heat exchanger and an outlet connected to the first hot end inlet of the heat exchanger. The raw material compressor is used to compress the reheated raw material gas and send the compressed raw material gas into the heat exchanger for cooling. The first distillation column has a first inlet connected to the first cold end outlet of the heat exchanger, and is used to distill the cooled raw material gas. The second condenser has its inlet connected to the first outlet of the first distillation column. It is used to condense the primary gas output from the first distillation column, and crude helium-neon gas is obtained at the first outlet of the second condenser.

2. The helium-neon extraction device according to claim 1, characterized in that, Also includes: The gas-liquid separator has its inlet connected to the liquid phase outlet of the first condenser and its outlet connected to the first cold end inlet of the heat exchanger, and is used to separate the raw material gas from the gas-liquid mixture.

3. The helium-neon extraction device according to claim 2, characterized in that, Also includes: The first throttle valve is connected to the inlet of the gas-liquid separator and the liquid phase outlet of the first condenser, respectively, and is used to throttle and reduce the pressure of the liquid output from the first condenser so that the gas-liquid mixture containing the raw material gas can be introduced into the inlet of the gas-liquid separator.

4. The helium-neon extraction apparatus according to claim 3, characterized in that, The second outlet of the second condenser is also connected to the second inlet of the first distillation column, for conveying reflux liquid to the first distillation column.

5. The helium-neon extraction apparatus according to claim 3, characterized in that, The bottom outlet of the first distillation column is connected to the second cold end inlet of the heat exchanger, and the second cold end outlet of the heat exchanger is connected to the cooling inlet of the second condenser. The heat exchanger is used to deeply cool the liquid nitrogen at the bottom of the first distillation column and send the cooled liquid nitrogen into the second condenser as the coolant for the second condenser.

6. The helium-neon extraction apparatus according to claim 3, characterized in that, The evaporation outlet of the second condenser is connected to the third cold end inlet of the heat exchanger, which is used to reheat the nitrogen gas discharged from the evaporation outlet to recover the cooling capacity.

7. The helium-neon extraction apparatus according to claim 3, characterized in that, The evaporation outlet of the second condenser is connected to the gas phase outlet of the gas-liquid separator, and a valve is provided between the evaporation outlet and the gas phase outlet to allow the air separation device to recover the cooling capacity of the nitrogen discharged from the evaporation outlet.

8. The helium-neon extraction apparatus according to claim 1, characterized in that, Also includes: A storage tank, with its inlet connected to the first hot end outlet of the heat exchanger, is used to store the raw material gas and discharge the raw material gas at a stable flow rate to the heat exchanger.

9. The helium-neon extraction apparatus according to claim 2, characterized in that, The cooling inlet of the second condenser is also used to receive external liquid nitrogen, which is used to provide cooling for the helium-neon extraction device.

10. The helium-neon extraction apparatus according to any one of claims 1-9, characterized in that, The first cold end inlet of the heat exchanger is connected to the gas phase outlet of the first condenser in one of the multiple air separation devices.

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