Coarse krypton xenon, high-purity oxygen, nitrogen circulation and oxygen recovery device extending from air separation unit
By introducing crude krypton xenon and high-purity oxygen extraction devices into the air separation unit, and combining them with liquid oxygen storage tanks and nitrogen liquefaction devices, the problem of the air separation unit failing to extract crude krypton xenon and high-purity oxygen has been solved, realizing the recycling of products and improving corporate efficiency.
Patent Information
- Application Number
- CN202423190007.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-24
AI Technical Summary
Existing air separation units have failed to extract crude krypton xenon and high-purity oxygen products, and there is a problem of wasting liquid oxygen products.
By introducing crude krypton-xenon extraction devices and high-purity oxygen extraction devices into the air separation unit, and connecting them to liquid oxygen storage tanks, nitrogen liquefaction devices, etc. through pipelines, cryogenic distillation of liquid oxygen and product recycling are achieved, including the use of piston oxygen compressors to recover uncondensed oxygen.
This technology enables the extraction of crude krypton xenon and high-purity oxygen products, reduces liquid oxygen waste, improves the purity and safety of liquid oxygen products, and increases corporate profits.
Smart Images
Figure CN223741099U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas separation technology, and in particular to an air separation unit that extends crude krypton xenon, high-purity oxygen, nitrogen circulation, and oxygen recovery device. Background Technology
[0002] There is currently one 30,000 Nm³ / h air separation unit and one 15,000 Nm³ / h air separation unit, such as Figure 1 As shown, the two air separation units are designed to produce a total of 1800 Nm³ / h of liquid oxygen. The liquid oxygen enters a 2000 m³ liquid oxygen storage tank through pipelines. The liquid oxygen contains a small amount of hydrocarbons. The air separation units do not have the function of extracting crude krypton xenon, high-purity oxygen, or other products. There is also an existing 3000 Nm³ / h nitrogen liquefaction unit with nitrogen circulation expansion and refrigeration. The raw material nitrogen is 0.8 MPa nitrogen produced by the two air separation units, which is reduced to 0.4 MPa by pressure reducing valve 9. The raw material nitrogen consumption is 3800 Nm³ / h. The product liquid nitrogen enters a 2000 m³ liquid nitrogen storage tank through pipelines. Utility Model Content
[0003] The present invention aims to solve the above-mentioned defects and provide an air separation unit that extends crude krypton xenon, high-purity oxygen, nitrogen circulation, and oxygen recovery device.
[0004] To overcome the deficiencies in the background technology, the technical solution adopted by this utility model to solve its technical problem is: an air separation unit extending to a crude krypton xenon, high-purity oxygen, nitrogen circulation, and oxygen recovery device, including an air separation unit, wherein the air separation unit is connected in parallel to a 50m³ vertical liquid oxygen storage tank and a 2000m³ liquid oxygen storage tank via pipelines, the 50m³ vertical liquid oxygen storage tank is connected in sequence to a crude krypton xenon extraction device and a crude krypton xenon product tank via pipelines, the crude krypton xenon extraction device is connected in parallel to valve one and valve two via pipelines, valve one is connected in series to the 2000m³ liquid oxygen storage tank via pipelines, and valve two is connected to the high-purity oxygen extraction device via pipelines.
[0005] Further improvements include installing a regulating valve in series on the pipeline between the air separation unit and the 2000m³ liquid oxygen storage tank.
[0006] Further improvements include connecting the high-purity oxygen extraction device to the valve three and the 2000m³ liquid oxygen storage tank in sequence via pipelines.
[0007] Further improvements include connecting the crude krypton-xenon extraction device sequentially to a piston oxygen compressor and an ironmaking blast furnace via pipelines.
[0008] Further improvements include connecting the air separation unit in parallel with the crude krypton-xenon extraction unit and the pressure reducing valve via pipelines, connecting the crude krypton-xenon extraction unit and the pressure reducing valve in series with the nitrogen liquefaction unit via pipelines, and connecting the nitrogen liquefaction unit to the liquid nitrogen storage tank via pipelines.
[0009] The beneficial effects of this utility model are as follows: This design obtains crude krypton-xenon product by arranging a crude krypton-xenon extraction device. The remaining liquid oxygen enters a high-purity oxygen extraction device to obtain high-purity oxygen product. Finally, the remaining liquid oxygen is returned to a 2000m³ liquid oxygen storage tank. The oxygen emitted from the end of the crude krypton-xenon extraction device is recycled. The nitrogen gas that has passed through the crude krypton-xenon extraction device is incorporated into a nitrogen liquefaction device and finally converted into liquid nitrogen product. Through the above modifications, the air separation unit, crude krypton-xenon extraction device, high-purity oxygen extraction device, nitrogen liquefaction device, and oxygen venting and recovery production units are fully integrated, extending the air separation process flow, increasing air separation products, fully exploring and utilizing the value of nitrogen and liquid oxygen products from the air separation unit, improving the safety of the liquid oxygen storage tank and the purity of the product, while avoiding product waste and increasing enterprise revenue. Attached Figure Description
[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0011] Figure 1 This is the main view of the existing technology;
[0012] Figure 2 This is the front view of this utility model;
[0013] In the diagram: 1-Air separation unit, 2-Regulating valve, 3-50m³ vertical liquid oxygen storage tank, 4-2000m³ liquid oxygen storage tank, 5-Pressure reducing valve, 6-Crude krypton xenon extraction unit, 7-Valve 1, 8-Valve 2, 9-Valve 3, 10-Nitrogen liquefaction unit, 11-Piston oxygen compressor, 12-High-purity oxygen extraction unit, 13-Liquid nitrogen storage tank, 14-Blast furnace for ironmaking, 15-Crude krypton xenon product tank, 16-High-purity oxygen product tank. Detailed Implementation
[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort in accordance with the embodiments of the basic utility model are within the scope of protection of this utility model.
[0015] according to Figure 2As shown, an air separation unit extends to a crude krypton-xenon, high-purity oxygen, nitrogen circulation, and oxygen recovery unit, including an air separation unit 1. The air separation unit 1 is connected in parallel to a 50m³ vertical liquid oxygen storage tank 3 and a 2000m³ liquid oxygen storage tank 4 via pipelines. The 50m³ vertical liquid oxygen storage tank 3 is connected in sequence to a crude krypton-xenon extraction unit 6 and a crude krypton-xenon product tank 15 via pipelines. The crude krypton-xenon extraction unit 6 is connected in parallel to valve 7 and valve 8 via pipelines. Valve 7 is connected in series with the 2000m³ liquid oxygen storage tank 4 via pipelines. Valve 8 is connected to a high-purity oxygen extraction unit 12 via pipelines.
[0016] In this embodiment, in order to stabilize the liquid level of the 50m³ vertical liquid oxygen storage tank 3 and to directly discharge excess liquid oxygen into the 2000m³ liquid oxygen storage tank 4, a regulating valve 2 is connected in series on the pipeline between the air separation unit 1 and the 2000m³ liquid oxygen storage tank 4.
[0017] In this embodiment, the high-purity oxygen extraction device 12 is connected to the valve 9 and the 2000m³ liquid oxygen storage tank 4 in sequence through pipelines. Opening the valve 9 allows the high-purity oxygen extraction device 12 to input the remaining purified liquid oxygen into the 2000m³ liquid oxygen storage tank 4.
[0018] In this embodiment, the crude krypton-xenon extraction device 6 is connected in sequence to the piston oxygen compressor 11 and the blast furnace 14 via pipelines. The crude krypton-xenon extraction device 6 produces some uncondensed liquefied oxygen at a flow rate of approximately 60 Nm³ / h. Originally, it was designed to be directly discharged into the atmosphere. Now, by adding a piston oxygen compressor 11, the vented oxygen is recovered, compressed to 0.8 MPa, and then supplied to the blast furnace 14 for use. This achieves zero waste in oxygen recovery and increases enterprise efficiency.
[0019] In this embodiment, the air separation unit 1 is connected in parallel with the crude krypton-xenon extraction unit 6 and the pressure reducing valve 5 via pipelines. The crude krypton-xenon extraction unit 6 and the pressure reducing valve 5 are connected in series with the nitrogen liquefaction unit 10 via pipelines. The nitrogen liquefaction unit 10 is connected to the liquid nitrogen storage tank 13 via pipelines. The 0.8MPa nitrogen output from the air separation unit 1 is reduced to 0.4MPa by the pressure reducing valve 5 before entering the nitrogen liquefaction unit 10. The liquid nitrogen product produced by the nitrogen liquefaction unit 10 enters the liquid nitrogen storage tank 13. The 0.8MPa nitrogen enters the crude krypton-xenon extraction unit 6 as a heat source for the evaporator of the crude krypton-xenon concentration tower, and then enters the condenser of the crude krypton-xenon concentration tower after throttling and cooling. When the nitrogen source is cooled and the nitrogen pressure at the crude krypton-xenon extraction unit 6 is 0.4 MPa after final reheating, this nitrogen is introduced into the nitrogen liquefaction unit 10 as raw material. This stops the use of 0.8 MPa nitrogen entering the nitrogen liquefaction unit 10 through the pressure reducing valve 5, and uses it as a backup gas source for the nitrogen liquefaction unit 10. This allows 0.8 MPa nitrogen to enter the crude krypton-xenon extraction unit 6 to meet the crude krypton-xenon extraction requirements. The nitrogen is then discharged from the crude krypton-xenon extraction unit 6 and enters the nitrogen liquefaction unit 10, ultimately being converted into liquid nitrogen product, increasing enterprise profits. At the same time, the nitrogen liquefaction unit 10 stops using nitrogen passing through the pressure reducing valve 5, saving nitrogen consumption and reducing the compression energy consumption of nitrogen from 0.8 MPa to 0.4 MPa.
[0020] Working principle: The crude krypton xenon extraction device 6 specifically includes two liquid oxygen pumps, a liquid oxygen adsorption system, a crude krypton xenon concentration tower, a plate-fin heat exchanger, a crude krypton xenon product tank, and related supporting pipelines, valves, instrumentation and control, and electrical control systems.
[0021] The air separation unit 1 outputs 0.8MPa nitrogen gas, which enters the crude krypton-xenon extraction unit 6 as a heat source for the evaporator of the crude krypton-xenon concentration tower. After throttling and cooling, it enters the cold source for the condenser of the crude krypton-xenon concentration tower. Finally, after reheating, the nitrogen gas pressure output from the crude krypton-xenon extraction unit 6 is 0.4MPa. This nitrogen gas is introduced into the nitrogen liquefaction unit 10 as raw material, thereby stopping the nitrogen gas entering the nitrogen liquefaction unit 10 through the pressure reducing valve 5. This nitrogen gas is used as a backup gas source for the nitrogen liquefaction unit 10. This achieves the goal of 0.8MPa nitrogen gas entering the crude krypton-xenon extraction unit 6 to meet the crude krypton-xenon extraction requirements. The nitrogen gas is then discharged from the crude krypton-xenon extraction unit 6 and then enters the nitrogen liquefaction unit 10, ultimately being converted into liquid nitrogen product, increasing enterprise efficiency. At the same time, the nitrogen liquefaction unit 10 stops the nitrogen gas passing through the pressure reducing valve 5, saving nitrogen consumption and reducing the compression energy consumption of nitrogen gas from 0.8MPa to 0.4MPa.
[0022] The crude krypton xenon extraction unit 6 produces some uncondensed liquefied oxygen with a flow rate of approximately 60 Nm³ / h. The original design allowed it to be directly released into the atmosphere. However, by adding a piston oxygen compressor 11, the released oxygen is recovered, compressed to 0.8 MPa, and then supplied to the blast furnace 14 for use. This achieves zero waste in oxygen recovery and increases the company's efficiency.
[0023] Liquid oxygen produced by the two air separation units 1 enters a 2000m³ liquid oxygen storage tank 4 and a 50m³ vertical liquid oxygen storage tank 3 through pipelines. A regulating valve 2 is used to control the liquid level stability of the 50m³ vertical liquid oxygen storage tank 3. Excess liquid oxygen enters directly into the 2000m³ liquid oxygen storage tank 4 through the regulating valve 2. Liquid oxygen entering the crude krypton-xenon extraction unit 6 utilizes the principle of cryogenic distillation. After obtaining the crude krypton-xenon product, the liquid oxygen generated at the top of the crude krypton-xenon concentration tower is returned to the 2000m³ liquid oxygen storage tank 4 by opening valve 7. This achieves the extraction of the crude krypton-xenon component from the liquid oxygen while retaining the liquid oxygen product from the air separation unit 1. Since the liquid oxygen has already undergone the process of producing the crude krypton-xenon product in the crude krypton-xenon extraction unit 6, the liquid oxygen... Methane, nitrous oxide, nitrogen, argon, krypton, xenon, and other components in oxygen are all separated. Therefore, the liquid oxygen returned to the 2000m³ liquid oxygen storage tank 4 via valve 17 from the crude krypton xenon extraction unit 6 is the best raw material for producing high-purity oxygen. This portion of liquid oxygen is then introduced into the high-purity oxygen extraction unit 12 through valve 28. Using the principle of cryogenic distillation, high-purity oxygen product is obtained in the bottom of the high-purity oxygen extraction tower and input into the high-purity oxygen product tank 16. The remaining liquid oxygen at the top of the high-purity oxygen extraction tower is returned to the 2000m³ liquid oxygen storage tank 4 through valve 39. This achieves the extraction of crude krypton xenon and then high-purity oxygen from the liquid oxygen product of the air separation unit 1, thereby extracting high-value-added products from the liquid oxygen and increasing the company's profits.
[0024] The liquid oxygen involved is processed through the crude krypton-xenon extraction unit 6 to obtain crude krypton-xenon product, which is then placed into the crude krypton-xenon product tank 15. The remaining liquid oxygen is then processed through the high-purity oxygen extraction unit 12 to obtain high-purity oxygen product, which is then placed into the high-purity oxygen product tank 16. Finally, the remaining liquid oxygen is returned to the 2000m³ liquid oxygen storage tank 4. The oxygen emitted from the end of the crude krypton-xenon extraction unit 6 is recovered and reused. The nitrogen gas that has passed through the crude krypton-xenon extraction unit 6 is incorporated into the nitrogen liquefaction unit 10 and finally converted into liquid nitrogen product. Through the above modifications, the air separation unit 1, the crude krypton-xenon extraction unit 6, the high-purity oxygen extraction unit 12, the nitrogen liquefaction unit 10, and the oxygen venting and recovery units are fully integrated, extending the air separation process flow, increasing air separation products, and fully exploring and utilizing the value of the nitrogen and liquid oxygen products of the air separation unit 1.
[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. An air separation unit with extended crude krypton xenon, high-purity oxygen, nitrogen circulation, and oxygen recovery components, characterized in that: The air separation device (1) is connected with a 50m3 vertical liquid oxygen tank (3) and a 2000m3 liquid oxygen tank (4) through pipelines in parallel, the 50m3 vertical liquid oxygen tank (3) is connected with a crude krypton-xenon extraction device (6) and a crude krypton-xenon product tank (15) through pipelines in sequence, the crude krypton-xenon extraction device (6) is connected with a valve one (7) and a valve two (8) through pipelines in parallel, the valve one (7) is connected with the 2000m3 liquid oxygen tank (4) through a pipeline in series, the valve two (8) is connected with a high-purity oxygen extraction device (12) through a pipeline, and the high-purity oxygen extraction device (12) is connected with a valve three (9) and the 2000m3 liquid oxygen tank (4) through pipelines in sequence.
2. The air separation unit with extended crude krypton xenon, high-purity oxygen, nitrogen circulation, and oxygen recovery device as described in claim 1, characterized in that: An adjusting valve (2) is arranged in series on the pipeline between the air separation device (1) and the 2000m3 liquid oxygen tank (4).
3. The air separation unit with extended crude krypton xenon, high-purity oxygen, nitrogen circulation, and oxygen recovery device as described in claim 1, characterized in that: The crude krypton-xenon extraction device (6) is connected with a piston oxygen compressor (11) and a blast furnace (14) through pipelines in sequence.
4. The air separation unit with extended crude krypton xenon, high-purity oxygen, nitrogen circulation, and oxygen recovery device as described in claim 1, characterized in that: The air separation device (1) is connected with the crude krypton-xenon extraction device (6) and a pressure reducing valve (5) through pipelines in parallel, the crude krypton-xenon extraction device (6) and the pressure reducing valve (5) are connected with a nitrogen liquefaction device (10) through pipelines in series, and the nitrogen liquefaction device (10) is connected with a liquid nitrogen tank (13) through a pipeline.