Crude helium-neon concentration device
By designing a crude helium-neon concentration device that utilizes the temperature difference of cold and heat sources, the problem of high energy consumption of helium-neon gas concentration in the prior art is solved, efficient helium-neon gas concentration is achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202421691620.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-17
AI Technical Summary
In the prior art, the concentration process of helium-neon gas consumes high energy, resulting in high production costs.
A crude helium-neon concentration device is designed to achieve efficient concentration of helium-neon gas by combining a distillation tower, a condensation evaporator, a vaporizer, a buffer tank and a membrane press using the temperature difference of cold and heat sources. The condensing evaporator improves heat exchange efficiency through the recycling of liquid nitrogen and the design of multiple shunts.
It effectively reduces the energy consumption of the helium-neon gas concentration process, reduces production costs, and improves the concentration efficiency of helium-neon gas.
Smart Images
Figure CN222925850U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of rare gas extraction and concentration, and particularly relates to a crude helium-neon concentration device. Background Technique
[0002] As members of rare gas products, neon and helium products have a wide range of applications. Neon is mainly used in the fields of insulating glass, scientific research, medical treatment, electric light sources, aerospace, etc.; helium is mainly used in the fields of cryogenic superconductivity, optical fibers, semiconductors, nuclear magnetic resonance, etc. In recent years, the domestic demand for rare gas products in the fields of semiconductors, optical fibers, aerospace, scientific research, etc. has continued to grow. There is a large gap between the supply and demand of international rare gases, and the global supply and demand of rare gases is out of balance.
[0003] Helium-neon gas can be extracted from existing air separation devices as a by-product, but the concentration of helium-neon gas extracted from air separation devices is relatively low and needs to be further concentrated. However, concentrating helium-neon gas requires consuming a high amount of energy and the production cost is relatively high. Summary of the Utility Model
[0004] The purpose of the utility model is to solve the problem of high energy consumption in the preparation process of helium-neon gas described in the above background technique. A new crude helium-neon concentration device is proposed here. This crude helium-neon concentration device can make full use of the temperature difference between cold and heat sources to reduce energy consumption.
[0005] The technical solution adopted to achieve the above purpose is a crude helium-neon concentration device. The crude helium-neon concentration device includes a rectifying column, a condensing evaporator, a vaporizer, a buffer tank and a membrane compressor. The condensing evaporator is arranged at the upper inner part of the rectifying column. The vaporizer is connected to the rectifying column through a pipeline. The buffer tank is connected to the vaporizer through a pipeline. The membrane compressor is connected to the buffer tank through a pipeline. The condensing evaporator includes:
[0006] A shell. The top of the shell is provided with a first liquid nitrogen inlet and a nitrogen outlet. The bottom of the shell is provided with a second liquid nitrogen inlet. The side wall of the shell is provided with a hot fluid inlet and a hot fluid outlet;
[0007] A gas guide pipe. The gas guide pipe is arranged inside the shell and connects the hot fluid inlet and the hot fluid outlet;
[0008] A plurality of diversion pipes. The diversion pipes are sleeved outside a part of the gas guide pipe;
[0009] A shunt plate. The shunt plate is provided with a plurality of shunt holes, and the diversion pipes are communicated with the shunt holes.
[0010] In the above technical solution, the raw gas from the air separation unit enters the distillation column for distillation to obtain concentrated helium-neon gas. The helium-neon gas is reheated to room temperature in the vaporizer and then enters the buffer tank. After being compressed by the membrane compressor, it is filled into the gas cylinder. The liquid nitrogen obtained after distillation is discharged from the bottom of the column. Part of it enters the user pipeline network, and part enters the condensing evaporator as a cold source. After heat exchange in the condensing evaporator, the liquid nitrogen turns into nitrogen gas and is discharged from the top of the distillation column and enters the user pipeline network. In the condensing evaporator of the present utility model, part of the liquid nitrogen enters the condensing evaporator from the second liquid nitrogen inlet to form a liquid nitrogen pool, and part of the liquid nitrogen is transported through the pipeline to the first liquid nitrogen inlet and enters from above the condensing evaporator, and exchanges heat with the helium-neon gas in the gas guide pipe through the diversion pipe, improving the heat exchange efficiency, and making full use of the liquid nitrogen generated by the distillation column as a cold source to exchange heat with the helium-neon gas, reducing energy consumption.
[0011] Further, a nitrogen discharge pipeline is provided at the top of the distillation column, and the nitrogen discharge pipeline is communicated with the nitrogen outlet.
[0012] In the above technical solution, the nitrogen gas after heat exchange is discharged into the user pipeline network for recycling.
[0013] Further, a raw material transportation pipeline is provided on the side wall of the lower part of the distillation column.
[0014] Further, a liquid nitrogen discharge pipeline is provided at the bottom of the distillation column, a branch pipeline is provided on the liquid nitrogen discharge pipeline, and the branch pipeline is communicated with the first liquid nitrogen inlet.
[0015] In the above technical solution, the liquid nitrogen generated by the distillation column is reused through the branch pipeline as a cold source of the condensing evaporator, reducing energy consumption.
[0016] Further, the gas guide pipe includes a plurality of branch gas pipes and a plurality of connectors, and the plurality of branch gas pipes are communicated through the connectors.
[0017] In the above technical solution, a longer gas transportation path is formed through the branch gas pipes and the connectors to achieve sufficient heat exchange.
[0018] Further, the branch gas pipe includes two main gas pipes and a plurality of shunt pipes, and the plurality of shunt pipes communicate the two main gas pipes.
[0019] In the above technical solution, the gas is shunted from the main gas pipe to the shunt pipe to increase the heat exchange area of the gas.
[0020] Further, the diversion pipe is sleeved outside the shunt pipe.
[0021] Further, through holes are provided at the bottom of the diversion pipe.
[0022] In the above technical solution, the through holes are used to introduce the liquid nitrogen in the diversion pipe into the liquid nitrogen pool.
[0023] Further, a concentrated gas outlet is provided on the side wall of the rectification column. The hot fluid outlet is communicated with the concentrated gas outlet through a pipeline, and the concentrated gas outlet is connected to a vaporizer through a pipeline.
[0024] In the above technical solution, the helium-neon gas that has undergone heat exchange in the condensation evaporator is introduced into the vaporizer.
[0025] Further, a connecting ring is provided on the peripheral side of the housing. The connecting ring connects the housing and the inner wall of the rectification column.
[0026] The advantages of the present utility model are as follows:
[0027] 1. The present utility model re-introduces the liquid nitrogen rectified by the rectification column into the condensation evaporator as a cold source, reducing energy consumption.
[0028] 2. In the present utility model, the condensation evaporator is provided with a gas guide pipe having a plurality of shunt pipes, increasing the heat exchange area. And the liquid nitrogen gathers at the bottom of the condensation evaporator to form a liquid nitrogen pool, and by extracting a part of the liquid nitrogen to flow down along the diversion pipe at the top of the condensation evaporator for collaborative heat exchange, the heat exchange area is further increased and the heat exchange efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.
[0030] Figure 1 It is a structural schematic diagram of the present utility model;
[0031] Figure 2 It is a structural schematic diagram of the condensation evaporator of the present utility model;
[0032] Figure 3 It is a structural schematic diagram of the branch gas pipe of the present utility model.
[0033] Illustration of the drawings: 1. Rectification column, 2. Condensation evaporator, 3. Vaporizer, 4. Buffer tank, 5. Membrane compressor, 6. Nitrogen discharge pipeline, 7. Raw material transportation pipeline, 8. Liquid nitrogen discharge pipeline, 9. Branch pipeline, 210. Housing, 211. First liquid nitrogen inlet, 212. Second liquid nitrogen inlet, 213. Hot fluid inlet, 214. Hot fluid outlet, 215. Nitrogen outlet, 216. Connecting ring, 220. Gas guide pipe, 221. Branch gas pipe, 222. Connector, 223. Main gas pipe, 224. Shunt pipe, 230. Diversion pipe, 231. Through hole, 240. Shunt plate. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0034] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.
[0035] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0036] As Figure 1 shown, a crude helium-neon concentration device, which is composed of a rectification column 1, a condensing evaporator 2, a vaporizer 3, a buffer tank 4, two membrane presses 5 and gas cylinders. Among them, the condensing evaporator is arranged at the upper part inside the rectification column, the vaporizer is connected to the rectification column through a pipeline, the buffer tank is connected to the vaporizer through a pipeline, the membrane press is connected to the buffer tank through a pipeline, and the membrane press is connected to the gas cylinder through a pipeline.
[0037] As Figure 2 shown, the condensing evaporator includes a housing 210, a gas guide pipe 220, a plurality of diversion pipes 230 and a shunt plate 240. Among them, a first liquid nitrogen inlet 211 and a nitrogen outlet 215 are provided at the top of the housing, a second liquid nitrogen inlet 212 is provided at the bottom of the housing, a hot fluid inlet 213 and a hot fluid outlet 214 are provided on both sides of the side wall of the housing; the gas guide pipe is arranged inside the housing and connects the hot fluid inlet and the hot fluid outlet. The gas guide pipe is composed of 5 branch gas pipes 221 and 4 connectors. The 5 branch gas pipes are respectively connected through 1 connector between two by two. The structure of the branch gas pipe is as Figure 3 shown, the branch gas pipe is composed of two main gas pipes and a plurality of diversion pipes. The plurality of diversion pipes connect the two main gas pipes. A diversion pipe is sleeved outside each diversion pipe, and there is a gap between the two for liquid nitrogen to pass through. A through hole 231 is provided at the bottom of the diversion pipe, and a connecting ring 216 is provided on the circumferential side of the housing for connecting the housing and the inner wall of the rectification column.
[0038] In this embodiment, a nitrogen discharge pipeline 6 is provided at the top of the rectification column. This nitrogen discharge pipeline is connected to the nitrogen outlet of the condensing evaporator, so that the liquid nitrogen absorbs heat and turns into nitrogen and is discharged.
[0039] In this embodiment, a raw material conveying pipeline 7 is provided on the side wall of the lower part of the rectification column, which is used to input the crude helium-neon gas produced by the air separation equipment into the rectification column as raw materials.
[0040] In this embodiment, a liquid nitrogen discharge pipeline 8 is provided at the bottom of the rectification column. A branch pipeline 9 is provided on this liquid nitrogen discharge pipeline. The branch pipeline is connected to the first liquid nitrogen inlet to input part of the liquid nitrogen from the top of the condensing evaporator.
[0041] In this embodiment, a concentrated gas outlet is provided on the side wall of the rectification column. The hot fluid outlet is connected to the concentrated gas outlet through a pipeline. The concentrated gas outlet is connected to the vaporizer through a pipeline to input the concentrated helium-neon gas obtained by the condensing evaporator into the vaporizer for rewarming.
[0042] In this embodiment, part of the liquid nitrogen obtained by the rectification column enters the condensing evaporator from the second liquid nitrogen inlet to form a liquid nitrogen pool, providing part of the cold source for the condensing evaporator.
[0043] In other embodiments, the number of branch gas pipes and shunt pipes can be adjusted according to actual production requirements.
[0044] The working process of the present utility model: The raw material gas from the air separation equipment is input into the rectification column through the raw material conveying pipeline. The temperature of this raw material gas is -179.2 °C, the pressure is 4.5 bara, and the flow rate is 1410 Nm 3 / h. After rectification, helium-neon gas and liquid nitrogen are obtained. This helium-neon gas enters the condensing evaporator from the rectification column through the hot fluid inlet and enters the vaporizer from the hot fluid outlet. Before entering the vaporizer, the temperature of the helium-neon gas is -191.3 °C, the pressure is 4.4 bara, and the flow rate is 3.94 Nm 3 / h. After being reheated to room temperature in the vaporizer, it enters the buffer tank and is compressed to 202 bar by the membrane compressor and filled into gas cylinders; the obtained liquid nitrogen has a temperature of -180.7 °C and a pressure of 4.4 bara. After throttling, its temperature drops to -193.0 °C and the pressure is 1.4 bara. Part of it enters the liquid nitrogen discharge pipeline, part of it enters the condensing evaporator through the branch pipeline, and another part of the liquid nitrogen enters the condensing evaporator from the second liquid nitrogen inlet to form a liquid nitrogen pool.
[0045] In the condensing evaporator, the liquid nitrogen at the top is shunted by the shunt plate and flows down through the diversion pipe. During this period, it exchanges heat with the helium-neon gas inside the upper part of the shunt pipe. The liquid nitrogen at the bottom forms a liquid nitrogen pool and continuously exchanges heat with the helium-neon gas in part of the gas guide pipes. The nitrogen converted from the liquid nitrogen is discharged from the nitrogen outlet and enters the user pipeline network through the nitrogen discharge pipeline for recycling.
[0046] Finally, it should be noted that this embodiment is only used to illustrate the present utility model and does not limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.
Claims
1. A crude helium-neon concentration device, characterized in that: The crude helium-neon concentration device comprises a distillation tower (1), a condenser evaporator (2), a vaporizer (3), a buffer tank (4) and a membrane press (5), wherein the condenser evaporator is arranged at the upper inner part of the distillation tower, the vaporizer is connected to the distillation tower via a pipeline, the buffer tank is connected to the vaporizer via a pipeline, and the membrane press is connected to the buffer tank via a pipeline, and the condenser evaporator comprises: A shell (210), wherein a first liquid nitrogen inlet (211) and a nitrogen outlet (215) are provided at the top of the shell, a second liquid nitrogen inlet (212) is provided at the bottom of the shell, and a hot fluid inlet (213) and a hot fluid outlet (214) are provided at the side wall of the shell; An air duct (220), the air duct being arranged inside the shell and connecting a hot fluid inlet and a hot fluid outlet; A plurality of flow guide tubes (230), wherein the flow guide tubes are sleeved outside a portion of the air guide tubes; A flow dividing plate (240) is provided with a plurality of flow dividing holes, and the flow guiding pipe is in communication with the flow dividing holes.
2. The crude helium-neon concentration device according to claim 1, characterized in that: A nitrogen discharge pipeline (6) is provided at the top of the distillation tower, and the nitrogen discharge pipeline is connected to the nitrogen outlet.
3. The crude helium-neon concentration device according to claim 1, characterized in that: A raw material delivery pipeline (7) is provided on the lower side wall of the distillation tower.
4. The crude helium-neon concentration device according to claim 1, characterized in that: A liquid nitrogen discharge pipeline (8) is provided at the bottom of the distillation tower, and a branch pipeline (9) is provided on the liquid nitrogen discharge pipeline, and the branch pipeline is communicated with the first liquid nitrogen inlet.
5. The crude helium-neon concentration device according to claim 1, characterized in that: The airway tube comprises a plurality of branch airways (221) and a plurality of connectors (222), and the plurality of branch airways are connected via the connectors.
6. The crude helium-neon concentration device according to claim 5, characterized in that: The branch airway comprises two main airways (223) and a plurality of shunt pipes (224), and the plurality of shunt pipes are connected to the two main airways.
7. The crude helium-neon concentration device according to claim 5, characterized in that: The flow guide pipe is sleeved outside the flow diversion pipe.
8. The crude helium-neon concentration device according to claim 1, characterized in that: A through hole (231) is provided at the bottom of the flow guide pipe.
9. The crude helium-neon concentration device according to claim 1, characterized in that: The side wall of the distillation tower is provided with a concentrated gas outlet, the hot fluid outlet is connected with the concentrated gas outlet through a pipeline, and the concentrated gas outlet is connected with the vaporizer through a pipeline.
10. The crude helium-neon concentration device according to claim 1, characterized in that: A connecting ring (216) is provided on the peripheral side of the shell, and the connecting ring connects the shell and the inner wall of the distillation tower.