Miniaturized single high nitrogen production device using liquid cold energy

Abstract

The utility model relates to a miniaturized single high nitrogen production device utilizing liquid cold energy, and belongs to the technical field of liquid nitrogen production. The device comprises an air compressor, an air cooling and drying system, an air separation cold box, a liquid storage tank and a liquid nitrogen storage tank. The air cooling and drying system is composed of a freezing dryer and a molecular sieve adsorber. The air separation cold box comprises a main heat exchanger, a rectifying tower, a condensation evaporator and a subcooler. The air is compressed, cooled and dried and then enters a rectifying tower to be subjected to oxygen-nitrogen separation, and high-purity nitrogen and oxygen-enriched liquid air are obtained. The high-purity nitrogen is condensed into liquid nitrogen through the condensation evaporator, part of the liquid nitrogen flows back to the rectifying tower, and the other part of the liquid nitrogen is stored in the liquid nitrogen storage tank. Liquid cold energy is used for replacing a traditional expansion machine for refrigeration, miniaturization of the device is achieved, the equipment cost and the maintenance cost are reduced, and the production efficiency and the product quality are improved. The device can flexibly adapt to different liquid cold energy sources, energy conservation and environmental protection are achieved by recycling cold energy, the whole device is integrated on the skid-mounted frame, transportation and installation are convenient, and the device is suitable for high-purity nitrogen production in various scenes.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid nitrogen production, and relates to a single high-nitrogen production device which is miniaturized by using liquid cold energy. Background Art

[0002] High-purity nitrogen is widely used. High-purity nitrogen has the characteristics of low-temperature inertness, small heat capacity, small thermal conductivity, etc., and has a wide range of applications in the refrigeration field; high-purity nitrogen can also be used for anti-oxidation, anti-corrosion and protection; high-purity nitrogen is also commonly used in various hydrotreating scenarios; in addition, in petroleum and chemical production, high-purity nitrogen can also be used for catalyst reduction and hydrogen storage, etc., to improve production efficiency and product quality.

[0003] In addition to the above several main application directions, high-purity nitrogen can also be used in many other scenarios. For example, in food processing and storage, high-purity nitrogen can be used for storage, packaging and sterilization to maintain the taste and quality of food. It is used as a protective gas and carrier gas in the manufacture of integrated circuits, semiconductors and electro-vacuum devices, as a carrier gas during chemical vapor deposition, as a carrier gas for liquid diffusion sources, and as a protective gas for devices in high-temperature diffusion furnaces. High-purity nitrogen is used as a replacement, drying, storage and transportation gas in processes such as epitaxy, lithography, cleaning and evaporation. In the manufacture of cathode ray tubes, the purity of nitrogen is required to be above 99.99%. In space technology, the liquid hydrogen filling system must be replaced with high-purity nitrogen first and then with high-purity helium. In addition, in the medical and life science fields, high-purity nitrogen is also widely used in production and laboratory work.

[0004] In short, high-purity nitrogen is a multi-functional gas and has a wide range of applications in all walks of life. With the continuous progress of technology and the continuous expansion of application scenarios, it is believed that its role and application fields will be more and more extensive.

[0005] Small high-purity nitrogen users generally meet their needs by purchasing high-purity liquid nitrogen gas or building their own single high-nitrogen devices. Different from the double-high air separation device that obtains both oxygen and nitrogen products at the same time, the single high-nitrogen device has only one product, high-purity nitrogen. Traditional single high-nitrogen production devices are equipped with expansion machines for refrigeration to maintain cold balance. However, for some small high-purity nitrogen users, the miniaturization of the device encounters the problem of miniaturization of the expansion machine. Even if a miniaturized expansion machine is equipped, the procurement cost and maintenance cost of the device are too high. Content of the Utility Model

[0006] In view of this, the purpose of the utility model is to solve the above problems and provide a single high-nitrogen production device which is miniaturized by using liquid cold energy.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A single high-nitrogen production device miniaturized by utilizing liquid cold energy, comprising an air compressor, an air cooling and drying system, an air separation cold box, a liquid storage tank and a liquid nitrogen storage tank;

[0009] The air cooling and drying system includes a cold dryer and a molecular sieve adsorber; two groups of inlets and outlets are provided on the molecular sieve adsorber, namely an air inlet and an air outlet, a regeneration gas inlet and a regeneration gas outlet;

[0010] The air separation cold box includes a main heat exchanger, a rectification column, a condensing evaporator and a subcooler; five groups of inlets and outlets are provided on the main heat exchanger, namely a first main heat exchange inlet and a first main heat exchange outlet, a second main heat exchange inlet and a second main heat exchange outlet, a third main heat exchange inlet and a third main heat exchange outlet, a fourth main heat exchange inlet and a fourth main heat exchange outlet, a fifth main heat exchange inlet and a fifth main heat exchange outlet;

[0011] Two groups of inlets and outlets are provided on the condensing evaporator, namely a condensed nitrogen inlet and a condensed liquid nitrogen outlet, a condensed liquid air inlet and a condensed air outlet;

[0012] Two groups of inlets and outlets are provided on the rectification column, namely a rectification air inlet and a rectification liquid air outlet, a rectification nitrogen outlet and a rectification liquid nitrogen inlet;

[0013] Two groups of inlets and outlets are provided on the subcooler, namely a subcooled liquid air inlet and a subcooled liquid air outlet, a subcooled air inlet and a subcooled air outlet;

[0014] A liquid storage tank outlet and a liquid storage tank vapor outlet are provided on the liquid storage tank; a liquid nitrogen storage tank inlet and a liquid nitrogen storage tank vapor outlet are provided on the liquid nitrogen storage tank;

[0015] The air compressor, the cold dryer and the molecular sieve adsorber are connected in series in sequence. The air inlet of the cold dryer is communicated with that of the molecular sieve adsorber, and the air outlet of the molecular sieve adsorber is communicated with the first main heat exchange inlet. The first main heat exchange inlet, the first main heat exchange outlet and the rectification air inlet are communicated in sequence to convey the compressed air into the rectification column;

[0016] The rectification liquid air outlet, the subcooled liquid air inlet, the subcooled liquid air outlet, the condensed liquid air inlet, the condensed air outlet and the subcooled air inlet are communicated in sequence. The condensed air outlet, the subcooled air inlet, the subcooled air outlet, the second main heat exchange inlet, the second main heat exchange outlet, the regeneration gas inlet and the regeneration gas outlet are communicated in sequence. The rectification nitrogen outlet, the condensed nitrogen inlet, the condensed liquid nitrogen outlet and the liquid nitrogen storage tank inlet are communicated in sequence. The liquid air obtained by rectification exchanges cold energy with the nitrogen coming out of the rectification column through the condensing evaporator, cools the nitrogen into liquid nitrogen, and conveys and stores it in the liquid nitrogen storage tank;

[0017] The outlet of the liquid storage tank is connected to the fourth inlet of the main heat exchanger. After recovering the cold energy through the main heat exchanger, it is transported to the user end from the fourth outlet of the main heat exchanger. The vapor outlets of the liquid storage tank and the liquid nitrogen storage tank are both connected to the fifth inlet of the main heat exchanger and are vented after reheating and recovering the cold energy through the main heat exchanger.

[0018] Further, the outlet of the condensed liquid nitrogen is also connected to the inlet of the rectifying liquid nitrogen, and part of the liquid nitrogen is transported to the rectifying column to participate in rectification as the reflux liquid of the rectifying column.

[0019] Further, the outlet of the rectifying nitrogen is also connected to the third inlet of the main heat exchanger, and the medium-pressure nitrogen coming out of the rectifying column is discharged from the third outlet of the main heat exchanger and sent to the user end as nitrogen product.

[0020] Further, throttle valves are provided between the first outlet of the main heat exchanger and the rectifying air inlet, between the outlet of the condensed liquid nitrogen and the inlet of the liquid nitrogen storage tank, and between the outlet of the subcooled liquid air and the inlet of the condensed liquid air.

[0021] Further, the air compressor is a screw compressor, which adopts single-stage compression, has oil-free and water-free lubrication, is equipped with a self-cooling device, and is configured with a permanent magnet motor, a vector frequency converter, and a water purification system.

[0022] Further, the cold dryer and the molecular sieve adsorber are integrated into one unit separately.

[0023] Further, the small-sized single high-nitrogen production device using liquid cold energy is integrally integrated on a skid-mounted frame.

[0024] Further, the liquid in the liquid storage tank is liquid nitrogen, liquid oxygen, liquid argon or liquid air.

[0025] The beneficial effects of the present utility model are as follows:

[0026] 1. Improve the degree of miniaturization of the equipment: By using liquid cold energy to replace the traditional expansion refrigeration, the present utility model solves the bottleneck problem of the difficulty in miniaturizing the expansion machine. The traditional expansion refrigeration system is large and complex in volume, making it difficult to achieve miniaturization. The present utility model uses the cold energy during the vaporization of liquid (such as liquid nitrogen, liquid oxygen, liquid argon, liquid air) for cooling, enabling the entire system to operate more compactly and efficiently, and is particularly suitable for the needs of small-scale high-purity nitrogen users.

[0027] 2. Reduce the equipment cost and maintenance cost: Since there is no need to configure a traditional expansion machine, the complexity and volume of the equipment are reduced, and the procurement cost of the device is greatly reduced. At the same time, due to the simplification of the system structure, the repair and maintenance costs of the equipment are also significantly reduced. The procurement and maintenance costs of the traditional expansion machine are relatively high, while the cold energy utilization system adopted by the present utility model reduces these costs.

[0028] 3. Improve production efficiency and product quality: The present utility model realizes the separation of oxygen and nitrogen through a rectification column to obtain high-purity nitrogen and oxygen-enriched liquid air. The high-purity nitrogen at the top of the rectification column is condensed into liquid nitrogen after heat exchange with the oxygen-enriched liquid air in a condensing evaporator, further improving the purity of the nitrogen. By automatically controlling the operating parameters through a PLC system, precise control and efficient production are achieved, improving the purity and production efficiency of the nitrogen product.

[0029] 4. Flexibly adapt to various liquid cold energy sources: The device and method of the present utility model can adapt to different types of liquid cold energy sources (such as liquid nitrogen, liquid oxygen, liquid argon, liquid air). The saturation temperatures of different liquids are different. By adjusting the raw air pressure and the output pressure of the liquid storage tank, flexible and efficient utilization of cold energy can be achieved to meet the needs of different users.

[0030] 5. Energy conservation and environmental protection: The present utility model realizes the efficient utilization of energy by recovering the cold energy in the liquid storage tank, reducing the energy consumption required for traditional expansion refrigeration. At the same time, due to the miniaturization of the system and the simplification of the structure, the impact on the environment during the operation of the equipment is reduced, having good energy conservation and environmental protection effects.

[0031] 6. Convenient operation and integrated design: The present utility model uses a PLC system to automatically control the operating parameters, realizing the automatic operation of the device, reducing the complexity of manual operation, and improving the safety and stability of the production process. At the same time, the single high-nitrogen production device using liquid cold energy miniaturization is integrally integrated on a skid-mounted frame, facilitating transportation, installation and use, and suitable for rapid deployment and application in different scenarios.

[0032] Other advantages, objectives and features of the present utility model will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail preferably with reference to the accompanying drawings, where:

[0034] Figure 1 is the schematic diagram of the single high-nitrogen production device using liquid cold energy miniaturization in the present utility model.

[0035] Reference Numerals: 1 - air compressor; 2 - refrigerant dryer; 3 - molecular sieve adsorber; 4 - main heat exchanger; 5 - rectification column; 6 - condensing evaporator; 7 - subcooler; 8 - liquid storage tank; 9 - liquid nitrogen storage tank; 33 - desorbed gas inlet; 34 - desorbed gas outlet; 40 - first main heat exchange inlet; 41 - first main heat exchange outlet; 42 - second main heat exchange inlet; 43 - second main heat exchange outlet; 44 - third main heat exchange inlet; 45 - third main heat exchange outlet; 46 - fourth main heat exchange inlet; 47 - fourth main heat exchange outlet; 48 - fifth main heat exchange inlet; 49 - fifth main heat exchange outlet; 51 - rectification air inlet; 52 - rectification liquid air outlet; 53 - rectification nitrogen outlet; 54 - rectification liquid nitrogen inlet; 61 - condensing nitrogen inlet; 62 - condensing liquid nitrogen outlet; 63 - condensing liquid air inlet; 64 - condensing air outlet; 71 - subcooled liquid air inlet; 72 - subcooled liquid air outlet; 73 - subcooled air inlet; 74 - subcooled air outlet; 81 - liquid storage tank outlet; 82 - liquid storage tank vapor outlet; 91 - liquid nitrogen storage tank inlet; 92 - liquid nitrogen storage tank vapor outlet. Detailed Embodiments

[0036] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0037] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0038] In the attached drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and cannot be construed as a limitation on the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0039] Please refer to Figure 1 , which is a small-scale single high-nitrogen production device utilizing liquid cold energy, including an air compressor 1, an air cooling and drying system, an air separation cold box, a liquid storage tank 8, and a liquid nitrogen storage tank 9;

[0040] The air cooling and drying system includes a cold dryer 2 and a molecular sieve adsorber 3; there are two sets of inlets and outlets on the molecular sieve adsorber 3, namely an air inlet and an air outlet, a desorbed gas inlet 33 and a desorbed gas outlet 34;

[0041] The air separation cold box includes a main heat exchanger 4, a rectification column 5, a condensing evaporator 6, and a subcooler 7; there are five sets of inlets and outlets on the main heat exchanger 4, namely a first main heat exchange inlet 40 and a first main heat exchange outlet 41, a second main heat exchange inlet 42 and a second main heat exchange outlet 43, a third main heat exchange inlet 44 and a third main heat exchange outlet 45, a fourth main heat exchange inlet 46 and a fourth main heat exchange outlet 47, a fifth main heat exchange inlet 48 and a fifth main heat exchange outlet 49;

[0042] There are 2 sets of inlets and outlets on the condensing evaporator 6, namely a condensing nitrogen inlet 61 and a condensing liquid nitrogen outlet 62, a condensing liquid air inlet 63 and a condensing air outlet 64;

[0043] There are 2 sets of inlets and outlets on the rectification column 5, namely a rectifying air inlet 51 and a rectifying liquid air outlet 52, a rectifying nitrogen outlet 53 and a rectifying liquid nitrogen inlet 54;

[0044] There are 2 sets of inlets and outlets on the subcooler 7, namely a subcooled liquid air inlet 71 and a subcooled liquid air outlet 72, a subcooled air inlet 73 and a subcooled air outlet 74;

[0045] There are a liquid storage tank outlet 81 and a liquid storage tank vapor outlet 82 on the liquid storage tank 8; there are a liquid nitrogen storage tank inlet 91 and a liquid nitrogen storage tank vapor outlet 92 on the liquid nitrogen storage tank 9;

[0046] An air compressor 1, a refrigerant dryer 2, and a molecular sieve adsorber 3 are connected in series in sequence. The air inlet of the refrigerant dryer 2 is communicated with the air inlet of the molecular sieve adsorber 3. The air outlet of the molecular sieve adsorber 3 is communicated with the first main heat exchange inlet 40. The first main heat exchange inlet 40, the first main heat exchange outlet 41, and the rectification air inlet 51 are communicated in sequence to convey the compressed air to the rectification column 5;

[0047] The rectified liquid air outlet 52, the subcooled liquid air inlet 71, the subcooled liquid air outlet 72, the condensed liquid air inlet 63, the condensed air outlet 64, and the subcooled air inlet 73 are communicated in sequence. The condensed air outlet 64, the subcooled air inlet 73, the subcooled air outlet 74, the second main heat exchange inlet 42, the second main heat exchange outlet 43, the desorbed gas inlet 33, and the desorbed gas outlet 34 are communicated in sequence. The rectified nitrogen outlet 53, the condensed nitrogen inlet 61, the condensed liquid nitrogen outlet 62, and the liquid nitrogen storage tank inlet 91 are communicated in sequence. The liquid air obtained by rectification exchanges cold energy with the nitrogen gas coming out of the rectification column 5 through the condensation evaporator 6 to cool the nitrogen gas into liquid nitrogen. The condensed liquid nitrogen outlet 62 is also communicated with the rectified liquid nitrogen inlet 54 to convey a part of the liquid nitrogen to the rectification column 5 to participate in rectification as the reflux liquid of the rectification column 5, and the other part of the liquid nitrogen is conveyed and stored in the liquid nitrogen storage tank 9;

[0048] The liquid storage tank outlet 81 is communicated with the fourth main heat exchange inlet 46, and after recovering cold energy through the main heat exchanger 4, it is conveyed to the user end from the fourth main heat exchange outlet 47; The liquid storage tank vapor outlet 82 and the liquid nitrogen storage tank vapor outlet 92 are both communicated with the fifth main heat exchange inlet 48 and are vented after reheating and recovering cold energy through the main heat exchanger 4.

[0049] Among them, the rectified nitrogen outlet 53 is also communicated with the third main heat exchange inlet 44, and the medium-pressure nitrogen gas coming out of the rectification column 5 is discharged from the third main heat exchange outlet 45 as a nitrogen gas product to be sent to the user end.

[0050] A throttle valve V1 is installed between the first main heat exchange outlet 41 and the rectification air inlet 51, a throttle valve V2 is installed between the condensed liquid nitrogen outlet 62 and the liquid nitrogen storage tank inlet 91, and a throttle valve V3 is installed between the subcooled liquid air outlet 72 and the condensed liquid air inlet 63.

[0051] In this embodiment, the air compressor 1 is a screw compressor, which adopts single-stage compression, has oil-free and water-free lubrication, is equipped with an air cooler, and is configured with a permanent magnet motor, a vector frequency converter, and a water purification system. The refrigerant dryer 2 and the molecular sieve adsorber 3 are integrally integrated separately. The production device is integrally integrated on a skid-mounted frame, which is convenient for modular assembly.

[0052] A method for producing single high-purity nitrogen by utilizing liquid cold energy is provided. The single high-purity nitrogen production device for miniaturization by utilizing liquid cold energy in this embodiment is adopted, and the operating parameters are automatically controlled by a PLC system. The cold energy when the liquid in the liquid storage tank 8 is vaporized is used for the production of liquid nitrogen and nitrogen gas;

[0053] After the air is pressurized by the air compressor 1, it enters the refrigerant dryer 2 for cooling and then enters the molecular sieve adsorber 3 to obtain dry and clean compressed air; the clean and dry compressed air enters the main heat exchanger 4 for cooling, is partially liquefied and then throttled into the rectification column 5; in the rectification column 5, according to the different boiling points of oxygen and nitrogen in the air, oxygen-nitrogen separation is achieved; high-purity pressurized nitrogen is obtained at the top of the rectification column 5, and oxygen-rich liquid air is obtained at the bottom.

[0054] The pressurized nitrogen at the top of the rectification column 5 is divided into two paths. One path exchanges heat with the oxygen-rich liquid air in the main condenser-evaporator 6 and is condensed into liquid nitrogen. Part of the liquid nitrogen enters the rectification column 5 as reflux liquid to participate in rectification, and the other part enters the liquid nitrogen storage tank 9 as a product; the other path is reheated by the main heat exchanger 4 and enters the user pipeline network as a product.

[0055] The oxygen-rich liquid air at the bottom of the rectification column 5 is subcooled by the subcooler 7 and then throttled into the main condenser-evaporator 6. After heat exchange with nitrogen, it evaporates into air, and then after being reheated by the subcooler 7 and the main heat exchanger 4, it enters the molecular sieve adsorber 3 as the desorbed gas.

[0056] The liquid cooling capacity in the liquid storage tank 8 is used to replace the refrigeration of the expansion machine in the traditional air separation unit to solve the bottleneck of the difficulty in miniaturizing the expansion machine; the liquid in the liquid storage tank 8 can be selected as liquid nitrogen, liquid oxygen, liquid argon or liquid air according to the actual situation. When the liquid in the liquid storage tank 8 is different, due to its different saturation temperatures, when recovering its cooling capacity, the raw air pressure is also different;

[0057] When the liquid in the liquid storage tank 8 is liquid nitrogen and the output pressure of the liquid nitrogen to the user end is 1.0 MPa, when recovering the cooling capacity of the liquid nitrogen, the air is pressurized by the air compressor 1 to 1.2 - 1.4 MPa;

[0058] When the liquid in the liquid storage tank 8 is liquid argon and the output pressure of the liquid argon to the user end is 1.0 MPa, when recovering the cooling capacity of the liquid argon, the air is pressurized by the air compressor 1 to 1.4 - 1.6 MPa;

[0059] When the liquid in the liquid storage tank 8 is liquid oxygen and the output pressure of the liquid oxygen to the user end is 1.0 MPa, when recovering the cooling capacity of the liquid oxygen, the air is pressurized by the air compressor 1 to 1.6 - 1.8 MPa;

[0060] When the liquid in the liquid storage tank 8 is liquid air and the output pressure of the liquid air to the user end is 1.0 MPa, when recovering the cooling capacity of the liquid air, the air is pressurized by the air compressor 1 to 1.3 - 1.5 MPa.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A miniaturized single high nitrogen production device utilizing liquid cooling energy, characterized in that: Including air compressor, air cooling and drying system, air separation cold box, liquid storage tank and liquid nitrogen storage tank; The air cooling and drying system comprises a cold dryer and a molecular sieve adsorber; the molecular sieve adsorber is provided with two groups of inlets and outlets, namely an air inlet and an air outlet, and a desorption gas inlet and a desorption gas outlet; The air separation cold box comprises a main heat exchanger, a distillation tower, a condenser evaporator and a subcooler; the main heat exchanger is provided with five groups of inlets and outlets, namely, a first inlet of the main heat exchange and a first outlet of the main heat exchange, a second inlet of the main heat exchange and a second outlet of the main heat exchange, a third inlet of the main heat exchange and a third outlet of the main heat exchange, a fourth inlet of the main heat exchange and a fourth outlet of the main heat exchange, and a fifth inlet of the main heat exchange and a fifth outlet of the main heat exchange; The condenser evaporator is provided with two groups of inlets and outlets, namely, a condensed nitrogen inlet and a condensed liquid nitrogen outlet, and a condensed liquid air inlet and a condensed air outlet; The distillation tower is provided with two groups of inlets and outlets, namely, a distillation air inlet and a distillation liquid air outlet, and a distillation nitrogen outlet and a distillation liquid nitrogen inlet; The subcooler is provided with two groups of inlets and outlets, namely a subcooled liquid air inlet and a subcooled liquid air outlet, and a subcooled air inlet and a subcooled air outlet; The liquid storage tank is provided with a liquid storage tank outlet and a liquid storage tank vapor outlet; the liquid nitrogen storage tank is provided with a liquid nitrogen storage tank inlet and a liquid nitrogen storage tank vapor outlet; The air compressor, the cold dryer, and the molecular sieve adsorber are connected in series in sequence, the cold dryer is connected to the air inlet of the molecular sieve adsorber, the air outlet of the molecular sieve adsorber is connected to the first inlet of the main heat exchange, the first inlet of the main heat exchange, the first outlet of the main heat exchange, and the distillation air inlet are connected in sequence to transport the compressed air to the distillation tower; The distillation liquid air outlet, the subcooled liquid air inlet, the subcooled liquid air outlet, the condensed liquid air inlet, the condensed air outlet, and the subcooled air inlet are connected in sequence, the condensed air outlet, the subcooled air inlet, the subcooled air outlet, the main heat exchange second inlet, the main heat exchange second outlet, the desorption gas inlet, and the desorption gas outlet are connected in sequence, the distillation nitrogen outlet, the condensed nitrogen inlet, the condensed liquid nitrogen outlet, and the liquid nitrogen storage tank inlet are connected in sequence, and the liquid air obtained by distillation exchanges cold with the nitrogen coming out of the distillation tower through the condenser evaporator, cools the nitrogen into liquid nitrogen, and transports and stores it in the liquid nitrogen storage tank; The liquid storage tank outlet is connected to the fourth inlet of the main heat exchange, and is transported to the user end from the fourth outlet of the main heat exchange after recovering cold energy through the main heat exchanger; the liquid storage tank vapor outlet and the liquid nitrogen storage tank vapor outlet are both connected to the fifth inlet of the main heat exchange, and are discharged after recovering cold energy through reheating of the main heat exchanger.

2. The miniaturized single high nitrogen production device using liquid cooling energy according to claim 1 is characterized in that: The condensed liquid nitrogen outlet is also connected to the distillation liquid nitrogen inlet, and part of the liquid nitrogen is transported to the distillation tower to participate in the distillation as the reflux liquid of the distillation tower.

3. The miniaturized single high nitrogen production device using liquid cooling energy according to claim 2 is characterized in that: The rectification nitrogen outlet is also connected to the third main heat exchange inlet, and the medium-pressure nitrogen coming out of the rectification tower is discharged from the third main heat exchange outlet and sent to the user end as a nitrogen product.

4. The miniaturized single high nitrogen production device using liquid cooling energy according to claim 1 is characterized in that: Throttle valves are arranged between the first outlet of the main heat exchange and the inlet of the distillation air, between the outlet of the condensed liquid nitrogen and the inlet of the liquid nitrogen storage tank, and between the outlet of the subcooled liquid air and the inlet of the condensed liquid air.

5. The miniaturized single high nitrogen production device using liquid cooling energy according to claim 1 is characterized in that: The air compressor is a screw compressor, adopts single-stage compression, oil-free water lubrication, has its own air cooler, and is equipped with a permanent magnet motor, a vector inverter, and a water purification system.

6. The miniaturized single high nitrogen production device using liquid cooling energy according to claim 1 is characterized in that: The cold dryer and the molecular sieve adsorber are separately integrated into one body.

7. The miniaturized single high nitrogen production device using liquid cooling energy according to claim 1 is characterized in that: The miniaturized single high-nitrogen production device utilizing liquid cooling energy is integrated as a whole on the skid-mounted frame.

8. The miniaturized single high nitrogen production device using liquid cooling energy according to claim 1 is characterized in that: The liquid storage tank contains liquid nitrogen, liquid oxygen, liquid argon or liquid air.

Images