Liquid air separation device for simultaneously producing internal compressed oxygen and coarse krypton xenon

Abstract

The utility model relates to the technical field of liquid air separation equipment, in particular to a liquid air separation device capable of simultaneously producing internal compressed oxygen and coarse krypton xenon, which is characterized in that an air booster, a high-temperature booster expansion turbine and a low-temperature booster expansion turbine are connected with a fractionating tower through pipelines; the expansion ends of the high-temperature booster expansion turbine and the low-temperature booster expansion turbine are positioned in the fractionating tower; the fractionating tower comprises a main heat exchanger, a subcooler, a gas-liquid separator, a rectifying tower, a full-rectification xenon preparation system, a liquid oxygen pump, a liquid oxygen adsorber and a krypton-xenon rectifying tower which are connected through pipelines; the rectifying tower comprises a lower tower and an upper tower, and a main condensation evaporator is arranged between the lower tower and the upper tower; the krypton-xenon rectifying tower comprises a poor krypton-xenon rectifying tower and a tower bottom evaporator located at the bottom of the poor krypton-xenon rectifying tower. According to the utility model, while liquid oxygen, liquid nitrogen and liquid xenon can be produced, internally compressed oxygen and coarse krypton xenon can also be produced, so that the utilization rate of raw material air is improved.

Description

Technical Field

[0001] This utility model relates to the field of liquid air separation equipment technology, specifically to a liquid air separation device that simultaneously produces internally compressed oxygen and crude krypton xenon. Background Technology

[0002] With the increasing maturity of liquid air separation technology and the development of the industrial gas market, industrial gas suppliers are increasingly favoring the operating model of relying on industrial parks to radiate to the surrounding regional markets. In this case, liquid air separation units that directly produce oxygen products to supply customers in the park and cover the surrounding areas are particularly suitable, as they can significantly reduce the overall gas supply cost.

[0003] Currently, liquid air separation units typically employ a process of air filtration and compression, compressed air pre-cooling and purification, air (nitrogen) circulation and pressurization, expansion via a high- and low-temperature turbine expander, and then feeding into a structured packing column for full distillation to produce argon, with the liquid product exiting the fractionation column. However, the main products of existing liquid air separation units are liquid oxygen, liquid nitrogen, and liquid xenon. Liquid air separation units suffer from the drawback of having a relatively singular product range, unable to separate oxygen and crude krypton xenon. For customers with on-site oxygen demand, supplying oxygen via liquid oxygen is too energy-intensive, resulting in poor economic efficiency and failing to adequately meet market demand. Summary of the Invention

[0004] This invention addresses the problem that existing liquid air separation devices produce relatively simple products and cannot effectively separate oxygen and crude krypton xenon. It provides a liquid air separation device that simultaneously produces internally compressed oxygen and crude krypton xenon. This device can produce liquid oxygen, liquid nitrogen, and liquid xenon, as well as internally compressed oxygen and crude krypton xenon, thereby improving the utilization rate of raw material air.

[0005] To achieve the above objectives, the technical solution of this utility model is: a liquid air separation unit that simultaneously produces internally compressed oxygen and crude krypton xenon, comprising an air compression system, an air precooling system, and a molecular sieve purification system connected sequentially by pipelines, and further comprising an air booster, a high-temperature booster turbine expander, a low-temperature booster turbine expander, and a fractionation tower. The air booster, high-temperature booster turbine expander, and low-temperature booster turbine expander are connected to the fractionation tower via pipelines, and the expansion ends of the high-temperature and low-temperature booster turbine expanders are located inside the fractionation tower. The air compression system is used to compress the feed air to produce low-pressure feed air with a certain pressure. The air precooling system cools the low-pressure feed air. The molecular sieve purification system removes impurities such as water, carbon dioxide, and hydrocarbons from the feed air. The high-temperature and low-temperature booster turbine expanders reduce the pressure and temperature of the feed air.

[0006] The distillation tower includes a main heat exchanger, a subcooler, a gas-liquid separator, a distillation tower, a full distillation xenon production system, a liquid oxygen pump, a liquid oxygen adsorber, and a krypton-xenon distillation tower, all connected by pipelines.

[0007] The distillation column includes a lower column and an upper column, with a main condenser-evaporator disposed between the lower column and the upper column; the krypton-xenon distillation column includes a lean krypton-xenon distillation column and a bottom evaporator located at the bottom of the lean krypton-xenon distillation column.

[0008] Furthermore, the air outlet of the molecular sieve purification system is connected to the air inlet of an air booster via a pipeline. The intermediate extraction outlet of the air booster is connected to the intermediate extraction inlet of the main heat exchanger via air pipeline one. The intermediate extraction outlet of the main heat exchanger is connected to the air inlet of the bottom evaporator via air pipeline two. The liquid air outlet of the bottom evaporator is connected to the liquid air inlet of the lower column via liquid air pipeline one. The intermediate extraction air, pressurized by the air booster, can enter the main heat exchanger for heat exchange. After heat exchange, the intermediate extraction air is sent to the bottom evaporator for processing, and then the liquid air is sent to the lower column.

[0009] Furthermore, the terminal outlet of the air booster is connected to the inlet of the booster end of the high-temperature booster turbine expander via air pipe three; the outlet of the booster end of the high-temperature booster turbine expander is connected to the inlet of the booster end of the low-temperature booster turbine expander via air pipe four; the outlet of the booster end of the low-temperature booster turbine expander is connected to the booster inlet of the main heat exchanger via air pipe five; the intermediate extraction outlet of the main heat exchanger is connected to the inlet of the expansion end of the low-temperature booster turbine expander via air pipe six; and the outlet of the expansion end of the low-temperature booster turbine expander is connected to the inlet of the gas-liquid separator via air pipe seven. The air expanded at the expansion end of the low-temperature booster turbine expander is then transported to the gas-liquid separator for gas-liquid separation.

[0010] Furthermore, the gas phase outlet of the gas-liquid separator is connected to the air inlet of the lower tower via air pipe eight; air pipe eight is connected to air pipe nine, the other end of which is connected to the reflux inlet of the main heat exchanger, and the reflux outlet of the main heat exchanger is connected to the air inlet of the air booster via air pipe one; the liquid phase outlet of the gas-liquid separator is connected to the liquid air inlet of the subcooler via liquid air pipe two, and the liquid air outlet of the subcooler is connected to the liquid air inlet of the upper tower via liquid air pipe three; the main heat exchanger is connected to the liquid air inlet of the lower tower via liquid air pipe four. The air separated by the gas-liquid separator enters the lower tower and the main heat exchanger respectively, and the air after heat exchange in the main heat exchanger is re-sent to the air booster for pressurization; the liquid air separated by the gas-liquid separator is sent to the subcooler, and the liquid air after further cooling in the subcooler is sent to the upper tower.

[0011] Furthermore, the air duct three is connected to the air inlet two, the other end of which is connected to the high-temperature expansion inlet of the main heat exchanger. The high-temperature expansion outlet of the main heat exchanger is connected to the inlet of the expansion end of the high-temperature booster turbine expander through the air inlet three. The outlet of the expansion end of the high-temperature booster turbine expander is connected to the high-temperature expansion inlet of the main heat exchanger through the air inlet four. The high-temperature expansion outlet of the main heat exchanger is connected to the air inlet of the lower tower through the air channel five.

[0012] Furthermore, the liquid air outlet of the lower column is connected to the liquid air inlet of the subcooler via liquid air pipe five, and the liquid air outlet of the subcooler is connected to the liquid air inlet of the upper column via liquid air pipe six; the lean liquid air outlet of the lower column is connected to the liquid air inlet of the subcooler via liquid air pipe seven, and the liquid air outlet of the subcooler is connected to the lean liquid air inlet of the upper column via liquid air pipe eight. The liquid air inside the lower column, after being cooled by the subcooler, can be transported to the upper column.

[0013] Furthermore, the nitrogen outlet of the lower column is connected to the nitrogen inlet of the main condenser-evaporator via a nitrogen pipeline. The liquid nitrogen outlet of the main condenser-evaporator is connected to the liquid nitrogen inlet of the subcooler via liquid nitrogen pipeline one. The liquid nitrogen outlet of the subcooler is connected to liquid nitrogen pipeline three, which is connected to liquid nitrogen pipeline four, which is connected to the liquid nitrogen inlet of the upper column. Liquid nitrogen pipeline one is also connected to liquid nitrogen pipeline two, the other end of which is connected to the liquid nitrogen inlet of the lower column. Nitrogen is condensed into liquid nitrogen in the main condenser-evaporator, and the liquid nitrogen is then transported to the subcooler and the lower column.

[0014] Furthermore, the nitrogen outlet of the upper tower is connected to the nitrogen inlet of the subcooler via a waste nitrogen pipeline one, the nitrogen outlet of the subcooler is connected to the nitrogen inlet of the main heat exchanger via a waste nitrogen pipeline two, and the nitrogen outlet of the main heat exchanger is connected to a waste nitrogen pipeline three. The waste nitrogen, after being treated by the main heat exchanger, can be discharged through the waste nitrogen pipeline.

[0015] Furthermore, the xenon outlet in the middle of the upper column is connected to the xenon inlet of the total distillation xenon production system via a xenon pipe. The liquid oxygen outlet of the total distillation xenon production system is connected to the liquid oxygen inlet of the upper column via a liquid oxygen pipe. The total distillation xenon production system is also connected to a liquid xenon pipe. Liquid xenon is obtained through distillation by the total distillation xenon production system and discharged through the liquid xenon pipe.

[0016] Furthermore, the liquid oxygen outlet of the main condenser-evaporator is connected to liquid oxygen pipeline two; liquid oxygen pipeline two is connected to liquid oxygen pipeline three, one end of which is connected to the inlet of the liquid oxygen pump, and the outlet of the liquid oxygen pump is connected to the liquid oxygen inlet of the liquid oxygen adsorber via liquid oxygen pipeline four. The liquid oxygen outlet of the liquid oxygen adsorber is connected to the liquid oxygen inlet of the lean krypton-xenon distillation column via liquid oxygen pipeline five. The oxygen outlet of the lean krypton-xenon distillation column is connected to the oxygen inlet of the main heat exchanger via oxygen pipeline one, and the oxygen outlet of the main heat exchanger is connected to oxygen pipeline two. The bottom of the lean krypton-xenon distillation column is connected to a crude krypton-xenon pipeline. The lean krypton-xenon distillation column distills crude krypton-xenon and oxygen. The crude krypton-xenon is discharged through the crude krypton-xenon pipeline, and the oxygen is discharged through oxygen pipeline two after being processed by the main heat exchanger.

[0017] The beneficial effects of this utility model through the above technical solution are as follows:

[0018] This invention has a reasonable structure and good performance. It can produce liquid oxygen, liquid nitrogen and liquid xenon, as well as internally compressed oxygen and crude krypton xenon. It improves the utilization rate of raw material air, reduces the energy consumption cost of supplying oxygen to customers with local oxygen demand through liquid oxygen, enriches the product types of liquid air separation units, and expands application scenarios.

[0019] This invention, through the cooperation of an air compression system, an air precooling system, a molecular sieve purification system, and a fractionation tower, can produce liquid nitrogen and liquid oxygen, and, with the cooperation of a xenon distillation system and a fractionation tower, can produce liquid xenon.

[0020] This invention enables the interchangeability of liquid oxygen and internally compressed oxygen products while maintaining a constant total amount of liquid products, thus expanding the adjustment range and adaptability of the liquid air separation unit. Furthermore, through distillation and concentration in a lean krypton-xenon distillation column, it achieves the recovery of rare gases krypton and xenon, as well as the production of oxygen, thereby improving air utilization. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a liquid air separation device that simultaneously produces internally compressed oxygen and crude krypton xenon according to this utility model.

[0022] The labels in the attached diagram are as follows: 1 - Air compression system; 2 - Air precooling system; 3 - Molecular sieve purification system; 4 - Air booster; 5 - High-temperature booster turbine expander; 6 - Low-temperature booster turbine expander; 7 - Distillation column; 8 - Main heat exchanger; 9 - Subcooler; 10 - Gas-liquid separator; 11 - Lower column; 12 - Main condenser-evaporator; 13 - Upper column; 14 - Total distillation xenon production system; 15 - Liquid oxygen pump; 16 - Liquid oxygen adsorber; 17 - Lean krypton xenon distillation column; 18 - Bottom evaporator; 19 - Air pipe 1; 20 - Air pipe 2; 21 - Liquid air pipe 1; 22 - Air pipe 3; 23 - Air pipe 4; 24 - Air pipe 5; 25 - Air pipe 6; 26 - Air pipe 7; 27 - Air pipe 8; 28 - Air pipe 9; 29 - Air conduit. 1. 30 is liquid air pipeline 2; 31 is liquid air pipeline 3; 32 is liquid air pipeline 4; 33 is air passage 2; 34 is air passage 3; 35 is air passage 4; 36 is air passage 5; 37 is liquid air pipeline 5; 38 is liquid air pipeline 6; 39 is liquid air pipeline 7; 40 is liquid air pipeline 8; 41 is nitrogen pipeline; 42 is liquid nitrogen pipeline 1; 43 is liquid nitrogen pipeline 2; 44 is liquid nitrogen pipeline 3; 45 is liquid nitrogen pipeline 4; 46 is waste nitrogen pipeline 1; 47 is waste nitrogen pipeline 2; 48 is waste nitrogen pipeline 3; 49 is xenon pipeline; 50 is liquid oxygen pipeline 1; 51 is liquid xenon pipeline; 52 is liquid oxygen pipeline 2; 53 is liquid oxygen pipeline 3; 54 is liquid oxygen pipeline 4; 55 is liquid oxygen pipeline 5; 56 is oxygen pipeline 1; 57 is oxygen pipeline 2; 58 is crude krypton xenon pipeline. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] like Figure 1As shown, a liquid air separation unit that simultaneously produces internally compressed oxygen and crude krypton xenon includes an air compression system 1, an air precooling system 2, and a molecular sieve purification system 3 connected in sequence by pipelines. It also includes an air booster 4, a high-temperature booster turbine expander 5, a low-temperature booster turbine expander 6, and a fractionation tower 7. The air booster 4, the high-temperature booster turbine expander 5, and the low-temperature booster turbine expander 6 are connected to the fractionation tower 7 by pipelines. The expansion ends of the high-temperature booster turbine expander 5 and the low-temperature booster turbine expander 6 are both located inside the fractionation tower 7. In this embodiment, the air compression system 1, air precooling system 2, molecular sieve purification system 3, and air booster 4 are all existing technologies and will not be described in detail here. The high-temperature booster turbine expander 5 and the low-temperature booster turbine expander 6 both include a booster, an expander, and a cooler. The raw material air enters the air compression system 1 and is compressed into low-pressure raw material air with a certain pressure. Then, the raw material air enters the air precooling system 2 through a pipeline to cool the raw material air. The raw material air then enters the molecular sieve purification system 3 through a pipeline to remove impurities such as water, carbon dioxide, and hydrocarbons.

[0025] The fractionation tower 7 includes a main heat exchanger 8, a subcooler 9, a gas-liquid separator 10, a distillation tower, a full distillation xenon production system 14, a liquid oxygen pump 15, a liquid oxygen adsorber 16, and a krypton xenon distillation tower, all connected by pipes.

[0026] The distillation column includes a lower column 11 and an upper column 13, with a main condenser-evaporator 12 disposed between the lower column 11 and the upper column 13; the krypton-xenon distillation column includes a lean krypton-xenon distillation column 17 and a bottom evaporator 18 located at the bottom of the lean krypton-xenon distillation column 17.

[0027] The air outlet of the molecular sieve purification system 3 is connected to the air inlet of the air booster 4 via a pipe. The intermediate extraction outlet of the air booster 4 is connected to the intermediate extraction inlet of the main heat exchanger 8 via air pipe 19. The intermediate extraction outlet of the main heat exchanger 8 is connected to the air inlet of the bottom evaporator 18 via air pipe 20. The liquid air outlet of the bottom evaporator 18 is connected to the liquid air inlet of the lower column 11 via liquid air pipe 21.

[0028] In this embodiment, the raw material air processed by the molecular sieve purification system 3 enters the air booster 4 to be pressurized. The pressurized air drawn in passes through air pipe 19 to the main heat exchanger 8. After being heated by the main heat exchanger 8, it passes through air pipe 20 to the bottom evaporator 18 of the krypton-xenon distillation column. After heat exchange in the bottom evaporator 18, it forms liquid air and enters the lower column 11 through liquid air pipe 21 to participate in the distillation process.

[0029] The end outlet of the air booster 4 is connected to the inlet of the booster end of the high-temperature booster turbine expander 5 via air pipe three 22. The outlet of the booster end of the high-temperature booster turbine expander 5 is connected to the inlet of the booster end of the low-temperature booster turbine expander 6 via air pipe four 23. The outlet of the booster end of the low-temperature booster turbine expander 6 is connected to the booster inlet of the main heat exchanger 8 via air pipe five 24. The intermediate extraction outlet of the main heat exchanger 8 is connected to the inlet of the expansion end of the low-temperature booster turbine expander 6 via air pipe six 25. The outlet of the expansion end of the low-temperature booster turbine expander 6 is connected to the inlet of the gas-liquid separator 10 via air pipe seven 26.

[0030] In this embodiment, the air that has been fully pressurized by the air booster 4 enters the pressurization end of the high-temperature pressurized turbine expander 5 through the air pipe 3 22. After being pressurized, it is then transported to the pressurization end of the low-temperature pressurized turbine expander through the air pipe 4 23 for further pressurization. After passing through the heat exchanger 8 through the air pipe 5 24, it enters the expansion end of the low-temperature pressurized turbine expander 6 through the air pipe 6 25 for expansion. Finally, it enters the gas-liquid separator 10 through the air pipe 7 26 for gas-liquid separation.

[0031] The gas phase outlet of the gas-liquid separator 10 is connected to the air inlet of the lower tower 11 via air pipe 8 27; air pipe 8 27 is connected to air pipe 9 28, the other end of which is connected to the reflux inlet of the main heat exchanger 8, and the reflux outlet of the main heat exchanger 8 is connected to the air inlet of the air booster 4 via air pipe 1 29; the liquid phase outlet of the gas-liquid separator 10 is connected to the liquid air inlet of the subcooler 9 via liquid air pipe 2 30, and the liquid air outlet of the subcooler 9 is connected to the liquid air inlet of the upper tower 13 via liquid air pipe 3 31; the main heat exchanger 8 is connected to the liquid air inlet of the lower tower 11 via liquid air pipe 4 32.

[0032] In this embodiment, the air separated by the gas-liquid separator 10 enters the lower column 11 through air pipe 8 27 to participate in the distillation process. Simultaneously, some air flows back to the main heat exchanger 8 through air pipe 9 28. After heat exchange in the main heat exchanger 8, it enters the air booster 4 through air pipe 1 29 for repressurization. The liquid air separated by the gas-liquid separator 10 is subcooled by the subcooler 9 and then enters the upper column 13 through liquid-air pipe 3 31. The liquid air generated after heat exchange in the heat exchanger 8 through air pipe 5 24 enters the lower column 11 through liquid-air pipe 4 32 to participate in the distillation process.

[0033] Air pipe 22 is connected to air pipe 33. The other end of air pipe 33 is connected to the high-temperature expansion inlet of the main heat exchanger 8. The high-temperature expansion outlet of the main heat exchanger 8 is connected to the inlet of the expansion end of the high-temperature booster turbine expander 5 through air pipe 34. The outlet of the expansion end of the high-temperature booster turbine expander 5 is connected to the high-temperature expansion inlet of the main heat exchanger 8 through air pipe 45. The high-temperature expansion outlet of the main heat exchanger 8 is connected to the air inlet of the lower column 11 through air channel 56. In this embodiment, the high-temperature expanded air after heat exchange in the main heat exchanger 8 can enter the lower column 11 through air channel 56 to participate in distillation.

[0034] The liquid air outlet of the lower column 11 is connected to the liquid air inlet of the subcooler 9 via liquid air pipe 5 37, and the liquid air outlet of the subcooler 9 is connected to the liquid air inlet of the upper column 13 via liquid air pipe 6 38. The lean liquid air outlet of the lower column 11 is connected to the liquid air inlet of the subcooler 9 via liquid air pipe 7 39, and the liquid air outlet of the subcooler 9 is connected to the lean liquid air inlet of the upper column 13 via liquid air pipe 8 40. In this embodiment, liquid air and lean liquid air are transported to the subcooler 9 via pipes, and after being subcooled by the subcooler 9, they are transported to the upper column via pipes.

[0035] The nitrogen outlet of the lower column 11 is connected to the nitrogen inlet of the main condenser-evaporator 12 via a nitrogen pipeline 41. The liquid nitrogen outlet of the main condenser-evaporator 12 is connected to the liquid nitrogen inlet of the subcooler 9 via a liquid nitrogen pipeline 42. The liquid nitrogen outlet of the subcooler 9 is connected to a liquid nitrogen pipeline 44, which is connected to a liquid nitrogen pipeline 45. The liquid nitrogen pipeline 45 is connected to the liquid nitrogen inlet of the upper column 13. The liquid nitrogen pipeline 42 is also connected to a liquid nitrogen pipeline 43, the other end of which is connected to the liquid nitrogen inlet of the lower column 11. In this embodiment, nitrogen enters the main condenser-evaporator 12 through pipelines and is condensed into liquid nitrogen. The liquid nitrogen is divided into two parts: one part is sent to the lower column as reflux liquid, and the other part is subcooled by the subcooler 9, with one part being sent out as product and the other part being sent to the upper column 13 through pipelines.

[0036] The nitrogen outlet of the upper column 13 is connected to the nitrogen inlet of the subcooler 9 via a waste nitrogen pipe 46. The nitrogen outlet of the subcooler 9 is connected to the nitrogen inlet of the main heat exchanger 8 via a waste nitrogen pipe 47. The nitrogen outlet of the main heat exchanger 8 is connected to a waste nitrogen pipe 48. In this embodiment, the waste nitrogen can be discharged from the top of the upper column 13, subcooled by the subcooler 9, and heat-exchanged by the main heat exchanger 8 before being discharged through the pipes.

[0037] The xenon outlet in the middle of the upper column 13 is connected to the xenon inlet of the full distillation xenon production system 14 via a xenon pipe 49. The liquid oxygen outlet of the full distillation xenon production system 14 is connected to the liquid oxygen inlet of the upper column 13 via a liquid oxygen pipe 50. The full distillation xenon production system 14 is also connected to a liquid xenon pipe 51. In this embodiment, xenon fraction can be extracted from the middle of the upper column 13 via the xenon pipe 49 and transported to the full distillation xenon production system 14. After distillation by the full distillation xenon production system, liquid oxygen and liquid xenon products are obtained.

[0038] The liquid oxygen outlet of the main condenser-evaporator 12 is connected to a second liquid oxygen pipe 52; the second liquid oxygen pipe 52 is connected to a third liquid oxygen pipe 53, one end of the third liquid oxygen pipe 53 is connected to the inlet of the liquid oxygen pump 15, the outlet of the liquid oxygen pump 15 is connected to the liquid oxygen inlet of the liquid oxygen adsorber 16 through a fourth liquid oxygen pipe 54, the liquid oxygen outlet of the liquid oxygen adsorber 16 is connected to the liquid oxygen inlet of the lean krypton-xenon distillation column 17 through a fifth liquid oxygen pipe 55, the oxygen outlet of the lean krypton-xenon distillation column 17 is connected to the oxygen inlet of the main heat exchanger 8 through an first oxygen pipe 56, the oxygen outlet of the main heat exchanger 8 is connected to a second oxygen pipe 57; the bottom of the lean krypton-xenon distillation column 17 is connected to a crude krypton-xenon pipe 58.

[0039] The working principle of this utility model is as follows: The raw material air enters the air compression system 1 and is compressed into low-pressure raw material air with a certain pressure. Then, the raw material air enters the air precooling system 2 through the pipeline. The air precooling system 2 cools the raw material air. The raw material air then enters the molecular sieve purification system 3 through the pipeline to remove impurities such as water, carbon dioxide and hydrocarbons. After being treated by the molecular sieve purification system 3, the raw material air enters the air booster 4 to be pressurized. The pressurized air drawn in passes through air pipeline 19 to the main heat exchanger 8. After being heated by the main heat exchanger 8, it enters the bottom evaporator 18 of the krypton-xenon distillation column through air pipeline 20. After heat exchange in the bottom evaporator 18, liquid air is formed and enters the lower column 11 through liquid air pipeline 21 to participate in the distillation process.

[0040] After being fully pressurized by the air booster 4, part of the air enters the pressurization end of the high-temperature pressurized turboexpander 5 through air pipe 3 22. After being pressurized, it is then transported to the pressurization end of the low-temperature pressurized turboexpander through air pipe 4 23 for further pressurization. Then, after passing through the heat exchanger 8 through air pipe 5 24, it enters the expansion end of the low-temperature pressurized turboexpander 6 through air pipe 6 25 for expansion. After that, it enters the gas-liquid separator 10 through air pipe 7 26 for gas-liquid separation. The separated air enters the lower column 11 through air pipe 8 27 to participate in the distillation process. At the same time, part of the air flows back to the main heat exchanger 8 through air pipe 9 28. After being heat exchanged in the main heat exchanger 8, it enters the air booster 4 again through air pipe 1 29 for repressurization. The liquid air separated by the gas-liquid separator 10 is subcooled by the subcooler 9 and then enters the upper column 13 through liquid air pipe 3 31. The air that enters the heat exchanger 8 through the air pipe 24 is heated and the resulting liquid air enters the lower column 11 through the liquid air pipe 32 to participate in the distillation process.

[0041] The remaining portion of the air, after being fully pressurized by the air booster 4, enters the main heat exchanger 8 through air pipe 2 33. After being heated by the main heat exchanger 8, it enters the expansion end of the high-temperature booster turbine expander 5 through air pipe 3 34. After being expanded, it enters the main heat exchanger 8 through air pipe 4 35, and then enters the lower column 11 through air channel 5 36 to participate in distillation.

[0042] Liquid air in the lower column 11 enters the subcooler 9 through liquid air pipe 5 37. After being subcooled by the subcooler 9, it enters the upper column 13 through liquid air pipe 6 38. Lean liquid air enters the subcooler 9 through liquid air pipe 7 39. After being subcooled by the subcooler 9, it enters the upper column 13 through liquid air pipe 8 40.

[0043] The air entering the lower column 11 is distilled by the distillation column consisting of the lower column 11, the main condenser-evaporator 12 and the upper column 13. Liquid nitrogen and nitrogen products are obtained at the top of the lower column 11, liquid oxygen products are obtained at the bottom of the upper column 13 and waste nitrogen products are obtained at the top.

[0044] Nitrogen gas enters the main condenser 12 through nitrogen pipeline 41 and is condensed into liquid nitrogen. The liquid nitrogen is divided into two parts. One part of the liquid nitrogen is transported to the subcooler 9 through liquid nitrogen pipeline 42. After being subcooled by the subcooler 9, part of it is transported out as liquid nitrogen product, and the other part is transported to the upper column 13 through liquid nitrogen pipeline 43. The remaining part of the liquid nitrogen is returned to the lower column 11 through liquid nitrogen pipeline 43 as reflux liquid.

[0045] In the middle of the upper column 13, xenon fractions can be extracted through xenon pipe 49 and transported to the full distillation xenon production system 14. After distillation by the full distillation xenon production system 14, liquid oxygen and liquid xenon products are obtained. The liquid oxygen product is refluxed back to the upper column 13 through liquid oxygen pipe 50, and the liquid xenon product is discharged as a product through liquid xenon pipe 51.

[0046] The waste nitrogen gas is transported from the top of the upper tower 13 to the subcooler 9 through waste nitrogen pipeline 46. After being subcooled by the subcooler 9, it is transported to the main heat exchanger 9 through waste nitrogen pipeline 47. After being heated by the main heat exchanger 9, it is discharged through waste nitrogen pipeline 48.

[0047] The liquid oxygen discharged from the bottom of the upper column 13 is divided into two parts. One part is discharged as liquid oxygen product through liquid oxygen pipeline 52, and the other part is transported to liquid oxygen pump 15 through liquid oxygen pipeline 3 53. The liquid oxygen pump 15 then transports the liquid oxygen to liquid oxygen adsorber 16 through liquid oxygen pipeline 54, and then to krypton-xenon distillation column through liquid oxygen pipeline 55. After being distilled by the krypton-xenon distillation column, crude krypton-xenon product and oxygen are obtained. The crude krypton-xenon product is discharged through crude krypton-xenon pipeline 58, and the oxygen is transported to the main heat exchanger 8 through oxygen pipeline 1 56. After being processed by the main heat exchanger 8, the oxygen is discharged as product through oxygen pipeline 2 57.

[0048] The embodiments described above are merely preferred embodiments of the utility model and are not intended to limit the scope of the utility model. Therefore, all equivalent changes or modifications made to the technical solutions described in the scope of the utility model patent application should be included within the scope of the utility model patent application.

Claims

1. A liquid air separation unit that simultaneously produces internally compressed oxygen and crude krypton xenon, comprising an air compression system (1), an air precooling system (2), and a molecular sieve purification system (3) connected in sequence via pipelines, characterized in that, It also includes an air booster (4), a high-temperature booster turbine expander (5), a low-temperature booster turbine expander (6), and a fractionation tower (7). The air booster (4), the high-temperature booster turbine expander (5), and the low-temperature booster turbine expander (6) are connected to the fractionation tower (7) through pipelines. The expansion ends of the high-temperature booster turbine expander (5) and the low-temperature booster turbine expander (6) are both located inside the fractionation tower (7). The fractionation tower (7) includes a main heat exchanger (8), a subcooler (9), a gas-liquid separator (10), a distillation tower, a full distillation xenon production system (14), a liquid oxygen pump (15), a liquid oxygen adsorber (16), and a krypton xenon distillation tower, all connected by pipes. The distillation column includes a lower column (11) and an upper column (13), and a main condenser evaporator (12) is provided between the lower column (11) and the upper column (13); the krypton-xenon distillation column includes a lean krypton-xenon distillation column (17) and a bottom evaporator (18) located at the bottom of the lean krypton-xenon distillation column (17).

2. A liquid air separation unit for simultaneously producing internally compressed oxygen and crude krypton-xenon according to claim 1, characterized in that, The air outlet of the molecular sieve purification system (3) is connected to the air inlet of the air booster (4) through a pipe. The middle extraction outlet of the air booster (4) is connected to the middle extraction inlet of the main heat exchanger (8) through air pipe one (19). The middle extraction outlet of the main heat exchanger (8) is connected to the air inlet of the bottom evaporator (18) through air pipe two (20). The liquid air outlet of the bottom evaporator (18) is connected to the liquid air inlet of the lower tower (11) through liquid air pipe one (21).

3. A liquid air separation unit for simultaneously producing internally compressed oxygen and crude krypton-xenon according to claim 1, characterized in that, The end outlet of the air booster (4) is connected to the inlet of the booster end of the high-temperature booster turbine expander (5) through air pipe three (22), and the outlet of the booster end of the high-temperature booster turbine expander (5) is connected to the inlet of the booster end of the low-temperature booster turbine expander (6) through air pipe four (23); the outlet of the booster end of the low-temperature booster turbine expander (6) is connected to the booster inlet of the main heat exchanger (8) through air pipe five (24), the middle extraction outlet of the main heat exchanger (8) is connected to the inlet of the expansion end of the low-temperature booster turbine expander (6) through air pipe six (25), and the outlet of the expansion end of the low-temperature booster turbine expander (6) is connected to the inlet of the gas-liquid separator (10) through air pipe seven (26).

4. A liquid air separation unit for simultaneously producing internally compressed oxygen and crude krypton-xenon according to claim 3, characterized in that, The gas phase outlet of the gas-liquid separator (10) is connected to the air inlet of the lower tower (11) through air pipe eight (27); air pipe eight (27) is connected to air pipe nine (28), the other end of air pipe nine (28) is connected to the reflux inlet of the main heat exchanger (8), and the reflux outlet of the main heat exchanger (8) is connected to the air inlet of the air booster (4) through air pipe one (29); the liquid phase outlet of the gas-liquid separator (10) is connected to the liquid air inlet of the subcooler (9) through liquid air pipe two (30), and the liquid air outlet of the subcooler (9) is connected to the liquid air inlet of the upper tower (13) through liquid air pipe three (31); the main heat exchanger (8) is connected to the liquid air inlet of the lower tower (11) through liquid air pipe four (32).

5. A liquid air separation unit for simultaneously producing internally compressed oxygen and crude krypton xenon according to claim 3, characterized in that, The air duct three (22) is connected to the air pipe two (33). The other end of the air pipe two (33) is connected to the high temperature expansion inlet of the main heat exchanger (8). The high temperature expansion outlet of the main heat exchanger (8) is connected to the inlet of the expansion end of the high temperature booster turbine expander (5) through the air pipe three (34). The outlet of the expansion end of the high temperature booster turbine expander (5) is connected to the high temperature expansion inlet of the main heat exchanger (8) through the air pipe four (35). The high temperature expansion outlet of the main heat exchanger (8) is connected to the air inlet of the lower tower (11) through the air channel five (36).

6. A liquid air separation unit for simultaneously producing internally compressed oxygen and crude krypton-xenon according to claim 1, characterized in that, The liquid air outlet of the lower column (11) is connected to the liquid air inlet of the subcooler (9) through liquid air pipe five (37), and the liquid air outlet of the subcooler (9) is connected to the liquid air inlet of the upper column (13) through liquid air pipe six (38); the lean liquid air outlet of the lower column (11) is connected to the liquid air inlet of the subcooler (9) through liquid air pipe seven (39), and the liquid air outlet of the subcooler (9) is connected to the lean liquid air inlet of the upper column (13) through liquid air pipe eight (40).

7. A liquid air separation unit for simultaneously producing internally compressed oxygen and crude krypton-xenon according to claim 1, characterized in that, The nitrogen outlet of the lower tower (11) is connected to the nitrogen inlet of the main condenser evaporator (12) via a nitrogen pipe (41). The liquid nitrogen outlet of the main condenser evaporator (12) is connected to the liquid nitrogen inlet of the subcooler (9) via a liquid nitrogen pipe (42). The liquid nitrogen outlet of the subcooler (9) is connected to a liquid nitrogen pipe (44). The liquid nitrogen pipe (44) is connected to a liquid nitrogen pipe (45). The liquid nitrogen pipe (45) is connected to the liquid nitrogen inlet of the upper tower (13). The liquid nitrogen pipe (42) is also connected to a liquid nitrogen pipe (43). The other end of the liquid nitrogen pipe (43) is connected to the liquid nitrogen inlet of the lower tower (11).

8. A liquid air separation unit for simultaneously producing internally compressed oxygen and crude krypton-xenon according to claim 1, characterized in that, The nitrogen outlet of the upper tower (13) is connected to the nitrogen inlet of the subcooler (9) through a first waste nitrogen pipe (46). The nitrogen outlet of the subcooler (9) is connected to the nitrogen inlet of the main heat exchanger (8) through a second waste nitrogen pipe (47). The nitrogen outlet of the main heat exchanger (8) is connected to a third waste nitrogen pipe (48).

9. A liquid air separation unit for simultaneously producing internally compressed oxygen and crude krypton-xenon according to claim 1, characterized in that, The xenon outlet in the middle of the upper column (13) is connected to the xenon inlet of the full distillation xenon production system (14) through the xenon pipe (49). The liquid oxygen outlet of the full distillation xenon production system (14) is connected to the liquid oxygen inlet of the upper column (13) through the liquid oxygen pipe (50). The full distillation xenon production system (14) is also connected to the liquid xenon pipe (51).

10. A liquid air separation unit for simultaneously producing internally compressed oxygen and crude krypton-xenon according to claim 1, characterized in that, The liquid oxygen outlet of the main condenser evaporator (12) is connected to liquid oxygen pipe two (52); the liquid oxygen pipe two (52) is connected to liquid oxygen pipe three (53), one end of the liquid oxygen pipe three (53) is connected to the inlet end of the liquid oxygen pump (15), the outlet end of the liquid oxygen pump (15) is connected to the liquid oxygen inlet of the liquid oxygen adsorber (16) through liquid oxygen pipe four (54), the liquid oxygen outlet of the liquid oxygen adsorber (16) is connected to the liquid oxygen inlet of the lean krypton xenon distillation column (17) through liquid oxygen pipe five (55), the oxygen outlet of the lean krypton xenon distillation column (17) is connected to the oxygen inlet of the main heat exchanger (8) through oxygen pipe one (56), the oxygen outlet of the main heat exchanger (8) is connected to oxygen pipe two (57); the bottom of the lean krypton xenon distillation column (17) is connected to crude krypton xenon pipe (58).

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