Four-working-condition miniature air separation equipment and method

Abstract

According to the four-working-condition miniature air separation equipment and method, by dynamically adjusting an airflow path, efficient production and flexible switching of four products including oxygen, nitrogen, liquid oxygen and liquid nitrogen are achieved, and the equipment applicability and the energy efficiency level are remarkably improved. The air separation equipment mainly comprises a compression system, a pre-cooling system, a purification system and a fractionating tower system, wherein the fractionating tower system comprises a heat exchange system, a rectification system and a storage output system. The miniature air separation equipment breaks through the limitation of single working condition of the traditional miniature air separation equipment, has the advantages of small size, high energy efficiency, flexibility in operation, movability and the like, can be widely applied to the fields of industrial gas production, medical oxygen supply and scientific research, and remarkably reduces the investment and operation cost of multi-product production equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air separation technology, in particular to a four-working-condition micro air separation device and method. BACKGROUND

[0002] With the wide application of industrial gas in emergency medical treatment, vehicle-mounted oxygen production, distributed energy and semiconductor manufacturing, the market demand for miniaturized vehicle-mounted air separation devices is rapidly growing. However, the traditional micro air separation device still faces multiple technical bottlenecks:

[0003] (1) The contradiction between separation efficiency and energy consumption is prominent. The miniaturized vehicle-mounted fractionating column has a 30%-50% reduction in theoretical plate number due to uneven gas-liquid distribution, resulting in a significant decrease in mass transfer efficiency. The variable pressure adsorption device has a shortened cycle period due to the limitation of adsorbent filling amount, and the energy utilization rate is less than 40%. In addition, the loss of cold energy is aggravated after the miniaturization of the device, and the energy consumption of the device is increased by more than 50% compared with large-scale devices, which restricts the play of the energy-saving advantage of the device.

[0004] (2) The single function and insufficient scene adaptability. The existing products are mainly focused on the production of single gas (oxygen or nitrogen), which cannot meet the needs of multiple scenes such as medical emergency and distributed energy. For example, the medical field requires quick switching between liquid oxygen and high-purity oxygen, and the response time of the traditional device is several hours.

[0005] (3) The starting speed and running stability are not good. The pre-cooling process of the low-temperature fractionating column takes several hours, which cannot meet the immediate needs of emergency scenes. The variable pressure adsorption technology has a high failure rate due to frequent valve switching and poor system stability.

[0006] In order to overcome the above technical problems, it is urgent to develop a micro air separation device and method with high separation efficiency, multi-mode switching and low energy consumption. SUMMARY

[0007] In view of the above defects of the prior art, the present application provides a four-working-condition micro air separation device and method, which realizes the flexible switching of oxygen, nitrogen, liquid oxygen and liquid nitrogen four modes by dynamically adjusting the operating parameters and air flow path, significantly improves the applicability and energy efficiency of the device, and provides a key solution for the technical upgrading of micro air separation devices.

[0008] The first object of the present application provides a four-working-condition micro air separation device, which comprises:

[0009] (1) a compression and purification system comprising a raw material air filter and a raw material air compressor connected by a pipeline; the raw material air filter is used for preliminarily filtering mechanical impurities in the air, and the raw material air compressor is used for pressurizing and conveying the preliminarily filtered air to the rear end;

[0010] (2) a pre-cooling system, comprising a refrigeration unit and a gas-liquid separator; the refrigeration unit is used to cool the pressurized air to about 16℃, and the gas-liquid separator is used to separate the moisture in the cooled air to obtain saturated air at 16℃;

[0011] (3) a purification system, comprising an adsorber and a molecular sieve, wherein the molecular sieve is loaded into the adsorber, and the adsorber is used to further remove the moisture, carbon dioxide, acetylene and hydrocarbons in the saturated air;

[0012] (4) a fractionating column system, comprising a heat exchange system, a rectification system and a storage and output system;

[0013] the heat exchange system comprises a main heat exchanger E1, a main heat exchanger E2, a high-pressure heat exchanger and a turbo expander; the turbo expander is connected with the pipeline of the main heat exchanger E2; the main heat exchanger E2 is connected with the pipeline of the main heat exchanger E1 and the high-pressure heat exchanger respectively; and the purification system is connected with the pipeline of the main heat exchanger E1 and the high-pressure heat exchanger respectively;

[0014] the rectification system comprises a fractionating column and a condenser-evaporator; the main heat exchanger E2 is connected with the pipeline of the fractionating column and the condenser-evaporator respectively;

[0015] the storage and output system comprises a liquid accumulator, a sub-cooler, a liquid oxygen and liquid nitrogen pump, a liquid output channel and a gas output channel; the liquid accumulator is connected with the pipeline of the fractionating column, the condenser-evaporator, the sub-cooler and the liquid oxygen and liquid nitrogen pump respectively; the sub-cooler is connected with the pipeline of the liquid oxygen and liquid nitrogen pump, the gas output channel and the main heat exchanger E2 respectively; and the high-pressure heat exchanger is connected with the pipeline of the gas output channel and the liquid oxygen and liquid nitrogen pump respectively.

[0016] The second object of the present application provides a four-working-condition micro air separation method, which uses the aforementioned air separation device and comprises the following steps of producing corresponding products by switching working conditions; the working conditions comprise:

[0017] (1) a liquid oxygen working condition, wherein the product is liquid oxygen;

[0018] (2) an oxygen working condition, wherein the product is gaseous oxygen;

[0019] (3) a liquid nitrogen working condition, wherein the product is liquid nitrogen;

[0020] (4) a nitrogen working condition, wherein the product is gaseous nitrogen.

[0021] Preferably, when the air separation device operates in the liquid oxygen working condition, the following steps are included:

[0022] A1, raw air compression and purification treatment;

[0023] A2, the purified air is subjected to heat exchange and cooling through the main heat exchanger E1 and the main heat exchanger E2.

[0024] A3, the air is separated into liquid oxygen and dirty nitrogen in the fractionating tower;

[0025] A4, the generated liquid oxygen flows from the condenser evaporator into the liquid reservoir, and the final liquid oxygen product is discharged at a fixed time after passing through the cold device;

[0026] A5, the dirty nitrogen gas returns to the adsorber after heat exchange.

[0027] Preferably, when the air separation device is running in the oxygen mode, the following steps are included:

[0028] B1, the raw air is compressed and purified;

[0029] B2, the purified air is cooled by heat exchange through the main heat exchanger E1, the high-pressure heat exchanger, and the main heat exchanger E2;

[0030] B3, the air is separated into liquid oxygen and dirty nitrogen in the fractionating tower;

[0031] B4, the generated liquid oxygen flows from the condenser evaporator into the liquid reservoir, and the final product gaseous oxygen is generated after reheat through the liquid oxygen and liquid nitrogen pump and the high-pressure heat exchanger;

[0032] B5, the dirty nitrogen gas returns to the adsorber after heat exchange.

[0033] Preferably, when the air separation device is running in the liquid nitrogen mode, the following steps are included:

[0034] C1, the raw air is compressed and purified;

[0035] C2, the purified air is cooled by heat exchange through the main heat exchanger E1 and the main heat exchanger E2;

[0036] C3, liquid nitrogen and oxygen-rich air are generated in the fractionating tower;

[0037] C4, the liquid nitrogen enters the liquid reservoir, and the final product liquid nitrogen is discharged at a fixed time after passing through the cold device;

[0038] C5, the oxygen-rich air returns to the adsorber after heat exchange.

[0039] Preferably, when the air separation device is running in the nitrogen mode, the following steps are included:

[0040] D1, the raw air is compressed and purified;

[0041] D2, the purified air is cooled by heat exchange through the main heat exchanger E1, the high-pressure heat exchanger, and the main heat exchanger E2;

[0042] D3, liquid nitrogen and oxygen-rich air are generated in the fractionating tower;

[0043] D4, liquid nitrogen enters the reservoir, passes through the liquid oxygen and liquid nitrogen pump and the high-pressure heat exchanger, and generates the final product gaseous nitrogen after reheat.

[0044] D5, the oxygen-enriched air is returned to the adsorber after heat exchange.

[0045] Preferably, the raw air compression and purification treatment comprises:

[0046] S1, after the impurities in the air are filtered through a raw air filter, the air enters a raw air compressor;

[0047] S2, after the pressurized high-temperature air is cooled by a post-cooling machine set, it enters a vapor-liquid separator, and after the separated water is separated, the saturated air enters a refrigeration machine set;

[0048] S3, the cooled air passes through an oil filter to remove the oil brought by the raw air compressor;

[0049] S4, the oil-removed air is sent to the refrigeration machine set again for cooling, and then passes through the vapor-liquid separator to separate the separated water;

[0050] S5, enters the adsorber to remove water, carbon dioxide and hydrocarbons.

[0051] The present application has the following beneficial effects:

[0052] (1) Multi-modal high-efficiency production and flexible switching. Breakthrough the single working condition limitation of traditional micro air separation equipment, realize dynamic switching of oxygen, nitrogen, liquid oxygen and liquid nitrogen four working conditions.

[0053] (2) High energy efficiency is maintained under miniaturization design, the optimized heat exchanger and subcooler design provides cold energy recovery efficiency

[0054] (3) Compact equipment architecture, single-tower rectification is adopted, the equipment volume is greatly reduced. Support vehicle deployment, meet the needs of mobile medical and distributed energy scenarios

[0055] Through the system-level innovative design, the multi-functional characteristics of large air separation devices are realized in the miniaturized equipment, which provides a new solution for mobile gas supply and emergency rescue fields. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 The air separation equipment principle of the embodiment of the present application is shown in the figure;

[0057] Figure 2 The production method steps under the gaseous oxygen working condition of the embodiment of the present application are shown in the figure. DETAILED DESCRIPTION

[0058] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0059] Embodiment one

[0060] An embodiment of the present application is a four-working-condition micro air separation device, as shown in the figure, including a compression purification system, a pre-cooling system, a purification system, a rectification system and the like. Figure 1

[0061] (1) The compression purification system includes a raw material air filter and a raw material air compressor connected by a pipeline; the raw material air filter preliminarily filters mechanical impurities in the air, and the raw material air compressor pressurizes and delivers the preliminarily filtered air to the rear end.

[0062] (2) The pre-cooling system includes a refrigeration unit and a gas-liquid separator; the refrigeration unit cools the pressurized air, and the temperature of the cooled air is about 16℃, and the gas-liquid separator separates the moisture in the cooled air to obtain saturated air at 16℃.

[0063] (3) The purification system includes an adsorber and a molecular sieve; the molecular sieve is loaded into the adsorber, the saturated air further removes water, carbon dioxide, acetylene and other hydrocarbons through the adsorber, and the purified air enters the rear end. Preferably, the adsorber is two, one of which is used for adsorption and the other is activated, and they are used alternately.

[0064] (4) The fractionation column system includes a heat exchange system, a rectification system and a storage and output system, as shown in the double-dashed box in the figure. The fractionation column system is the low-temperature environment part of the air separation device, and this area is also called a cold box. Figure 1

[0065] The heat exchange system mainly includes a main heat exchanger E1, a main heat exchanger E2, a high-pressure heat exchanger E4 and a turbine expander B1. The turbine expander B1 is used for expansion refrigeration, which can realize air liquefaction, can be cooled to -173℃, and can provide a low-temperature environment for rectification separation. The main heat exchanger E1 is used for heat exchange between the compressed and purified air and the return flow gas. The main heat exchanger E2 is connected with the turbine expander B1, and is used for low-temperature gas-liquid heat exchange at the outlet of the turbine expander B1. The high-pressure heat exchanger E4 is connected with a liquid oxygen and liquid nitrogen pump, and is used for heat exchange of high-pressure liquid oxygen and liquid nitrogen output from the liquid oxygen and liquid nitrogen pump, and auxiliary heat is used for gaseous oxygen and gaseous nitrogen production.

[0066] ​​The core component of the rectification system is a fractionating column, which separates oxygen and nitrogen through a tray or a filler. The embodiment of the present application adopts a single-column structure, and a condenser-evaporator can also be separately arranged, so that high-purity nitrogen is obtained at the top of the column, and high-purity oxygen is obtained at the bottom of the column.

[0067] The storage output system comprises a liquid accumulator, a subcooler E3, and a liquid output channel and a gas output channel. When liquid oxygen or liquid nitrogen is output, the liquid oxygen or liquid nitrogen generated in the accumulator is subcooled by the subcooler E3 and then discharged through the liquid output channel at a regular time.

[0068] When oxygen or nitrogen needs to be produced, the liquid oxygen or liquid nitrogen in the accumulator is subcooled by the subcooler E3, enters a liquid oxygen / liquid nitrogen pump, is compressed to 15 MPa, is reheated by hot air entering the column in a high-pressure heat exchanger E4, and is then output through the gas output channel.

[0069] The embodiment of the present application is a four-working-condition micro air separation device, which can produce four high-purity products of liquid oxygen, liquid nitrogen, oxygen and nitrogen through the connection and cooperation of the above-mentioned parts, with the aid of certain pipeline selection and working condition control.

[0070] Embodiment two

[0071] The embodiment of the present application is a four-working-condition micro air separation device and a micro air separation method, which comprises four working conditions.

[0072] (1) Liquid oxygen working condition, to output liquid oxygen.

[0073] (2) Oxygen working condition, to output gaseous oxygen.

[0074] (3) Liquid nitrogen working condition, to output liquid nitrogen.

[0075] (4) Nitrogen working condition, to output gaseous nitrogen.

[0076] Each working condition needs to first perform raw material air compression and purification treatment, and the specific steps are as follows:

[0077] S1, after the dust, mechanical impurities and the like are filtered by a raw material air filter, the air enters a raw material air compressor to be pressurized to about 1.4 MPa.

[0078] S2, after the pressurized high-temperature air is cooled by a post-cooling machine set, the air enters a vapor-liquid separator to separate the separated water, and then the saturated air enters a refrigerating machine set to be cooled to about 40℃.

[0079] S3, after the cooled air passes through an oil filter to remove the oil in the raw material air compressor, the oil content in the air is less than 0.01 PPm.

[0080] S4, the oil-removed air reaches the refrigeration unit again, is cooled to about 16°C, and is separated from water by a vapor-liquid separator to obtain saturated air at about 16°C.

[0081] S5, the air enters the adsorber to further remove water, carbon dioxide, acetylene and other hydrocarbons.

[0082] The air separation method under the liquid oxygen working condition comprises the following steps:

[0083] A1, the raw air is compressed and purified.

[0084] A2, the purified air is cooled by heat exchange through the main heat exchanger E1 and the main heat exchanger E2.

[0085] After the air enters the cold box of the air separation device, the air is first cooled by heat exchange with a stream of backflow gas in the main heat exchanger E1, and then is further cooled by heat exchange with two streams of backflow gas in the main heat exchanger E2, and becomes saturated air with a certain moisture content.

[0086] A3, the air is separated into liquid oxygen and dirty nitrogen gas in the fractionating tower.

[0087] The saturated air with a certain moisture content reaches the saturation temperature and enters the fractionating tower, and is cooled by the saturated liquid oxygen on the low-pressure side into saturated liquid air. The liquid air is throttled to 0.5 MPa by the throttle valve V3, and then enters the upper part of the fractionating tower as a backflow liquid. The liquid oxygen is evaporated as ascending steam on the low-pressure side of the condenser evaporator, and the air is separated into liquid oxygen and dirty nitrogen gas in the fractionating tower.

[0088] A4, the generated liquid oxygen flows from the condenser evaporator into the liquid reservoir, is subcooled, and is discharged at a fixed time to obtain the final liquid oxygen product.

[0089] The liquid oxygen flows from the low-pressure side of the condenser evaporator into the liquid reservoir through the regulating valve V8, is subcooled by the cold cooler E3, and is discharged at a fixed time.

[0090] A5, the dirty nitrogen gas is backflowed to the adsorber after heat exchange.

[0091] The dirty nitrogen gas in the upper part of the fractionating tower is heat-exchanged by the main heat exchanger E2, enters the turbine expander to be expanded, and the low-temperature dirty nitrogen gas after expansion is reheated by the cold cooler E3, the main heat exchanger E2 and the main heat exchanger E1, and is discharged from the cold box. A part of the dirty nitrogen gas discharged from the cold box is backflowed to the adsorber to provide a gas source for the regeneration of the adsorbent.

[0092] The air separation method under the oxygen working condition, as shown in Figure 2 , comprises the following steps:

[0093] B1, the raw air is compressed and purified.

[0094] B2, the purified air is cooled by heat exchange through the main heat exchanger E1, the high pressure heat exchanger E4 and the main heat exchanger E2.

[0095] After purification, the air is divided into two paths to enter the cold box, one path exchanges heat with the expanded backflow of the contaminated nitrogen gas in the main heat exchanger E1, and the other path exchanges heat with the high pressure oxygen in the high pressure heat exchanger E4, and then the two air streams are combined to enter the main heat exchanger E2, where the air is cooled to the saturation temperature by the contaminated nitrogen and the expanded contaminated nitrogen, and has a certain moisture content.

[0096] B3, the air is separated into liquid oxygen and contaminated nitrogen gas in the fractionating tower.

[0097] The saturated air with moisture enters the fractionating tower and is cooled to saturated liquid air by the saturated liquid oxygen on the low pressure side. The liquid air is throttled to 0.5 MPa by the throttle valve V3 and then enters the upper part of the fractionating tower as a reflux liquid. The liquid oxygen is evaporated as ascending steam on the low pressure side of the condenser evaporator, and the air is separated into liquid oxygen and contaminated nitrogen gas in the fractionating tower.

[0098] B4, the generated liquid oxygen flows from the condenser evaporator to the liquid reservoir, and then passes through the liquid oxygen pump and the high pressure heat exchanger to generate the final gaseous oxygen after reheat.

[0099] The liquid oxygen from the low pressure side of the condenser evaporator flows into the liquid reservoir through the regulating valve V8, is subcooled by the cold cooler E3, is compressed to 15 MPa by the liquid oxygen pump, is reheated by the hot air entering the tower in the high pressure heat exchanger E4, and is discharged from the cold box to the oxygen filling station to fill the bottles.

[0100] B5, the contaminated nitrogen gas is backflowed to the adsorber after heat exchange.

[0101] The contaminated nitrogen gas at the upper part of the tower is heat exchanged by the main heat exchanger E2, enters the turbine expander to be expanded, and is discharged from the cold box after being reheated by the liquid oxygen subcooler E3, the main heat exchanger E2 and the main heat exchanger E1. A part of the contaminated nitrogen gas discharged from the cold box is backflowed to the adsorber to provide a gas source for the adsorbent regeneration.

[0102] The air separation method under the liquid nitrogen working condition includes the following steps:

[0103] C1, the raw air is compressed and purified.

[0104] C2, the purified air is cooled by heat exchange through the main heat exchanger E1 and the main heat exchanger E2.

[0105] After entering the cold box, the air is first heat exchanged with one stream of backflow gas in the main heat exchanger E1, and then is heat exchanged with two streams of backflow gas in the main heat exchanger E2 to be further cooled to reach the saturation temperature and have a certain moisture content.

[0106] C3, liquid nitrogen and oxygen-enriched air are generated in the fractionating tower.

[0107] The saturated wet air is throttled to 0.9 MPa by the throttle valve V2 and then enters the lower part of the fractionating tower to flow down to the bottom of the fractionating tower, and the gas rises to be rectified. The saturated oxygen-rich liquid air in the lower part of the fractionating tower is throttled to 0.45 MPa by the throttle valve V4 and then enters the low-pressure side of the auxiliary condenser-evaporator K2 to cool the saturated gas nitrogen with a purity of 99.9% drawn from the upper part of the fractionating tower into liquid nitrogen.

[0108] C4, The liquid nitrogen enters the liquid accumulator and is discharged as the final liquid nitrogen product at a regular time after passing through the cold trap.

[0109] Part of the liquid nitrogen flows back to the upper part of the fractionating tower as reflux liquid through the valve V6, and the other part of the liquid nitrogen enters the liquid accumulator as the product. The liquid nitrogen is subcooled by the cold trap E3 and is discharged at a regular time.

[0110] C5, The oxygen-rich air is returned to the adsorber after heat exchange.

[0111] The oxygen-rich air discharged from the top of the condenser-evaporator K2 is heat-exchanged by the heat exchanger E2, enters the turbo-expander to be expanded and refrigerated, and is discharged from the cold box after passing through the cold trap E3, the main heat exchanger E2 and the main heat exchanger E1. Part of the oxygen-rich air discharged from the cold box enters the adsorber to provide a gas source for the regeneration of the adsorber.

[0112] The air separation method under the nitrogen condition comprises the following steps:

[0113] D1, The raw air is compressed and purified.

[0114] D2, The purified air is heat-exchanged and cooled by the main heat exchanger E1, the high-pressure heat exchanger E4 and the main heat exchanger E2.

[0115] The purified air enters the cold box in two ways, one of which is heat-exchanged with the expanded oxygen-rich air in the main heat exchanger E1, and the other of which is heat-exchanged with the high-pressure nitrogen in the high-pressure heat exchanger E4, and then the two streams of air are combined and enter the main heat exchanger E2, where the air is cooled to the saturated temperature by the oxygen-rich air discharged from the tower and the expanded oxygen-rich air and has a certain moisture content.

[0116] D3, Liquid nitrogen and oxygen-rich air are generated in the fractionating tower.

[0117] The saturated wet air is throttled to 0.9 MPa by the throttle valve V2 and then enters the lower part of the fractionating tower to flow down to the bottom of the fractionating tower, and the gas rises to be rectified. The saturated oxygen-rich liquid air in the lower part of the fractionating tower is throttled to 0.45 MPa by the throttle valve V4 and then enters the low-pressure side of the auxiliary condenser-evaporator to cool the saturated gas nitrogen with a purity of 99.9% drawn from the upper part of the fractionating tower into liquid nitrogen.

[0118] D4, The liquid nitrogen enters the liquid accumulator, is reheated by the liquid oxygen and liquid nitrogen pump and the high-pressure heat exchanger, and is finally generated into gaseous nitrogen as the product.

[0119] Part of the liquid nitrogen flows back to the upper part of the fractionating tower as reflux liquid through V6 valve, and the other part of the liquid nitrogen enters the liquid accumulator. The liquid nitrogen in the liquid accumulator is supercooled through the cold trap E3, enters the liquid nitrogen pump and is compressed to 15 MPa, is reheated by the hot air entering the tower in the high-pressure heat exchanger, and then is discharged from the cold box to the gas filling platform for bottle filling.

[0120] D5, oxygen-enriched air is returned to the adsorber after heat exchange.

[0121] The oxygen-enriched air discharged from the top of the condensation evaporator K2 is heat-exchanged through the heat exchanger E2, enters the turbine expander for expansion and refrigeration, and is reheated through the cold trap E3, the main heat exchanger E2 and the main heat exchanger E1 after expansion and is discharged from the cold box. Part of the oxygen-enriched air discharged from the cold box enters the adsorber to provide a gas source for the regeneration of the adsorber.

[0122] The four-working-condition micro air separation equipment and micro air separation method can change the working condition and generate products with different requirements according to the needs.

[0123] The above description is only the preferred embodiments of the present application, and it should be pointed out that those skilled in the art can make some improvements and refinements without departing from the technical principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A four-mode mini air separation plant, characterized in that, Comprise: (1) compressed purification system, including by pipeline connection of raw material air filter and raw material air compressor; The raw material air filter is used for preliminary filtering mechanical impurities in air, and the raw material air compressor is used for pressurizing and conveying the air after preliminary filtering to rear end; (2) precooling system, including refrigerating unit, gas-liquid separator; The refrigerating unit is used for cooling the air after pressurization to about 16 DEG C, and the gas-liquid separator is used for separating moisture in the air after cooling, and obtaining 16 DEG C saturated air; (3) purification system, including adsorber, molecular sieve, oil filter; The molecular sieve is loaded in the adsorber, and the adsorber is used for further removing water, carbon dioxide, acetylene and hydrocarbon in the saturated air; (4) fractionating column system, including heat exchange system, rectification system, storage output system; The heat exchange system, including main heat exchanger E1, main heat exchanger E2, high-pressure heat exchanger and turbine expander; The turbine expander is connected with main heat exchanger E2 pipeline; Main heat exchanger E2 is connected with main heat exchanger E1 and high-pressure heat exchanger pipeline respectively; The purification system is connected with main heat exchanger E1 and high-pressure heat exchanger pipeline respectively; The rectification system, including fractionating column and condenser evaporator; Main heat exchanger E2 is connected with fractionating column and condenser evaporator pipeline respectively; The storage output system, including liquid reservoir, supercooler, liquid oxygen and liquid nitrogen pump, liquid output channel and gas output channel; The liquid reservoir is connected with fractionating column, condenser evaporator, supercooler, liquid oxygen and liquid nitrogen pump pipeline respectively; The supercooler is connected with liquid oxygen and liquid nitrogen pump, gas output channel and main heat exchanger E2 pipeline respectively; The high-pressure heat exchanger is connected with gas output channel and liquid oxygen and liquid nitrogen pump pipeline respectively.

2. A four-mode micro air separation method, characterized in that, Use the air separation equipment according to claim 1, including producing corresponding products by switching working conditions; The working conditions include: (1) liquid oxygen working condition, the product is liquid oxygen; (2) oxygen working condition, the product is gaseous oxygen; (3) liquid nitrogen working condition, the product is liquid nitrogen; (4) nitrogen working condition, the product is gaseous nitrogen.

3. The method of claim 2, wherein, When the air separation equipment runs in the liquid oxygen working condition, the following steps are included: A1, raw material air compression purification treatment; A2, the purified air is heat exchanged and cooled through main heat exchanger E1 and main heat exchanger E2; A3, the air is separated into liquid oxygen and dirty nitrogen gas in fractionating column; A4, the generated liquid oxygen flows into liquid reservoir from condenser evaporator, and the final liquid oxygen product is discharged after passing through cold cooler; A5, the dirty nitrogen gas is returned to adsorber after heat exchange.

4. The method of claim 2, wherein, When the air separation equipment runs in the oxygen working condition, the following steps are included: B1, raw material air compression purification treatment; B2, the purified air is heat exchanged and cooled through main heat exchanger E1, high-pressure heat exchanger and main heat exchanger E2; B3, the air is separated into liquid oxygen and dirty nitrogen gas in fractionating column; B4, the generated liquid oxygen flows into liquid reservoir from condenser evaporator, and the final product gaseous oxygen is generated after reheat through liquid oxygen and liquid nitrogen pump and high-pressure heat exchanger; B5, the dirty nitrogen gas is returned to adsorber after heat exchange.

5. The method of claim 2, wherein, When the air separation equipment runs in the liquid nitrogen working condition, the following steps are included: C1, raw material air compression and purification treatment; C2, the purified air is cooled by heat exchange through the main heat exchanger E1 and the main heat exchanger E2; C3, liquid nitrogen and oxygen-enriched air are generated in the fractionating tower; C4, the liquid nitrogen enters the liquid accumulator, and the final product liquid nitrogen is discharged at regular time after passing through the cold machine; C5, the oxygen-enriched air is returned to the adsorber after heat exchange.

6. The method of claim 2, wherein, When the air separation unit operates in the nitrogen mode, the following steps are included: D1, raw material air compression and purification treatment; D2, the purified air is cooled by heat exchange through the main heat exchanger E1, the high-pressure heat exchanger and the main heat exchanger E2; D3, liquid nitrogen and oxygen-enriched air are generated in the fractionating tower; D4, the liquid nitrogen enters the liquid accumulator, and the final product gaseous nitrogen is generated after reheat through the liquid oxygen and liquid nitrogen pump and the high-pressure heat exchanger; D5, the oxygen-enriched air is returned to the adsorber after heat exchange.

7. The air separation method according to any one of claims 3 to 6, characterized in that, The raw material air compression and purification treatment includes: S1, after the impurities are filtered through the raw material air filter, the air enters the raw material air compressor; S2, after the high-temperature air is cooled by the after-cooling machine set, the air enters the vapor-liquid separator, and the separated water is separated, and then the saturated air enters the refrigeration machine set; S3, the cooled air passes through the oil filter to remove the oil brought by the raw material air compressor; S4, the oil-removed air is sent to the refrigeration machine set for cooling again, and then the separated water is separated through the vapor-liquid separator; S5, the air enters the adsorber to remove water, carbon dioxide and hydrocarbons.

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