High-pressure gas transmission device

Abstract

The invention relates to a high-pressure gas transmission device, which adopts a low-temperature expansion machine and a liquid air pressurizing and recooling technology to form a brand-new pneumatic / hydraulic combined high-pressure gas transmission device, is good in energy-saving effect and low in noise, can also produce liquid oxygen, liquid nitrogen or high-purity nitrogen as byproducts, and has obvious expected benefits.

Description

Technical Field

[0001] The invention relates to a high-pressure gas transmission device, in particular to a high-pressure gas transmission device adopting air separation low-temperature expander technology. Background Art

[0002] The existing multi-stage compression and intercooling compressor high-pressure gas transmission technology needs to consider the effective recovery and utilization of the compression heat of the compressor. However, the heat recovery and utilization of low-grade compression heat is a difficult problem and needs to be combined with appropriate processes for efficient recovery and utilization. In addition, the device is noisy.

[0003] Therefore, it is worth studying how to reduce the compression heat generated by the high-pressure compressor, reduce the difficulty of heat recovery and utilization of low-grade compression heat, and reduce the impact of the unit's noise on the human-machine environment. Summary of the invention

[0004] A high-pressure gas transmission device realizes high-pressure gas transmission through a supplementary cooling circuit. The process is as follows: after being compressed by a compressor 1, the air enters a cooling unit 2 for liquefaction to obtain liquid air (liquid air is liquid air, the same below), which is then sent to a liquid storage tank 3. The liquid air in the liquid storage tank 3 is then pressurized by a high-pressure pump and enters the cooling unit 2 to release cold energy to cool the compressed air, forming a high-pressure gas 15 for output;

[0005] The supplementary cooling circuit refers to the liquid air coming out of the liquid storage tank 3, which is gasified by the hydraulic pump 4 and the cooling unit 2, and then enters the low-temperature expander 5 to expand and do work to reduce the temperature. The exhaust gas of the low-temperature expander 5 enters the cooling unit 2 to recover the cold and is then discharged. It is then pressurized by the compressor 1 or the compressor 7 and enters the cooling unit 2 to be liquefied, and enters the liquid storage tank 3 for storage. The mechanical energy generated by the low-temperature expander 5 is used to drag the brake 6, thereby forming a supplementary cooling circuit for the device.

[0006] The air compression and cooling process in the high-pressure gas transmission device also includes air purification and purification, which is used to remove solid matter and impurity gases in the air; the air purification and purification equipment is integrated in the compressor 1 and / or the compressor 7 and / or the cold exchange unit 2, or integrated in the connecting pipes of the compressor 1, the compressor 7, and the cold exchange unit 2.

[0007] The cooling unit 2 adopts a series, parallel or series-parallel connection of cooling devices, wherein the medium is two-phase or more.

[0008] The brake 6 of the cryogenic expander 5 includes but is not limited to a fan, a liquid pump, a compressor or an air compressor, and is used to recover the expansion work generated by the cryogenic expander 5 .

[0009] The air compressor 1 or compressor 7 is only used for distinction, and in essence they are both air compression and boosting equipment; the same applies to hydraulic pumps or liquid air pumps, and high-pressure pumps.

[0010] A distillation unit 9 is provided: the liquid air coming out of the liquid storage tank 3 is pressurized by the liquid air pump 8 and then enters the distillation unit 9 to produce liquid oxygen 10 and gaseous nitrogen for output.

[0011] A liquefaction unit 11 is provided: the gaseous nitrogen produced from the distillation unit 9 passes through the liquefaction unit 11 to produce liquid nitrogen 12.

[0012] The distillation unit 9 is designed, installed and operated with reference to the distillation tower of the air separation device.

[0013] The liquefaction unit 11 is implemented by a conventional compression refrigeration process or a low-temperature expansion machine process.

[0014] The air in the high-pressure gas transmission device is in an isobaric liquefaction process, which means that the raw air entering the cooling unit 2 does not need to be expanded, depressurized and refrigerated like the traditional air separation process. The air coming out of the compressor only has resistance losses of equipment and pipelines along the way, and can be regarded as an isobaric liquefaction process of air with little pressure change.

[0015] The air purification and purification equipment in the high-pressure gas transmission device, wherein the purification equipment includes a molecular sieve purifier, a reversible cooler or a stone cooler, etc., should be able to ensure the continuous and normal operation of the process.

[0016] Equipment and its systems, pipelines, instruments, valves, cold preservation, bypass facilities with regulating functions, etc. not described in this application shall be matched with reference to or in accordance with mature technologies in well-known traditional processes.

[0017] This system adopts necessary measures such as heat recovery, cooling, and venting regulation.

[0018] Parts not mentioned in this application, such as safety accessories, automatic control, etc., are equipped with existing publicly known technologies, that is, existing mature, reliable and reasonable technical measures are applied to this device.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. Compared with the existing multi-stage compression and intermediate cooling compressor high-pressure gas transmission technology, the air isobaric liquefaction combined with the air separation expander and the high-pressure pump pressurization and cooling gasification high-pressure gas supply technology can effectively reduce the compression heat power consumption of the compressor and reduce the difficulty of heat recovery of the low-grade compression heat of the compressor. The comprehensive power consumption of high-pressure gas supply is greatly reduced. It is a new energy-saving gas pressure / hydraulic combined high-pressure gas supply device, which is suitable for the transformation and upgrading of the existing large-scale multi-stage high-pressure compressor unit gas supply system;

[0021] 2. Liquid oxygen, liquid nitrogen or nitrogen gas can be easily produced through stored liquid air, and can also be used for refrigeration.

[0022] 3. Compared with the existing high-pressure machine with multi-stage compression and intermediate cooling, the unit noise of this high-pressure gas transmission device is low, and it is an environmentally friendly pneumatic / hydraulic combined high-pressure gas supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the process flow of a high-pressure gas transmission device.

[0024] Figure 1 In: 1-compressor, 2-cooling unit, 3-low-pressure liquid storage tank, 4-hydraulic pump, 5-cryogenic expander, 6-brake, 7-compressor, 8-liquid air pump, 9-distillation unit, 10-liquid oxygen, 11-nitrogen liquefaction unit, 12-liquid nitrogen, 13-liquid air, 14-high-pressure pump, 15-high-pressure air. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Embodiment 1:

[0027] like Figure 1 As shown, a high-pressure gas transmission device, the specific embodiments are as follows:

[0028] After being compressed by the compressor 1, the air enters the cooling unit 2 to be liquefied to obtain liquid air, which is then sent to the liquid storage tank 3. The liquid air in the liquid storage tank 3 is then pressurized by the high-pressure pump and enters the cooling unit 2 to release cold energy to cool the compressed air, forming high-pressure gas 15 for output;

[0029] The supplementary cooling circuit refers to the liquid air coming out of the liquid storage tank 3, which is gasified by the hydraulic pump 4 and the cooling unit 2, and then enters the low-temperature expander 5 to expand and do work to reduce the temperature. The exhaust gas of the low-temperature expander 5 enters the cooling unit 2 to recover the cold and is then discharged. It is then pressurized by the compressor 1 or the compressor 7 and enters the cooling unit 2 to be liquefied, and enters the liquid storage tank 3 for storage. The mechanical energy generated by the low-temperature expander 5 is used to drag the brake 6, thereby forming a supplementary cooling circuit for the device.

[0030] The air compression and cooling process in the high-pressure gas transmission device also includes air purification and purification, which is used to remove solid matter and impurity gases in the air; the air purification and purification equipment is integrated in the compressor 1 and / or the compressor 7 and / or the cold exchange unit 2, or integrated in the connecting pipes of the compressor 1, the compressor 7, and the cold exchange unit 2.

[0031] The cooling unit 2 adopts a series, parallel or series-parallel connection of cooling devices, wherein the medium is two-phase or more.

[0032] The brake 6 of the cryogenic expander 5 includes but is not limited to a fan, a liquid pump, a compressor or an air compressor, and is used to recover the expansion work generated by the cryogenic expander 5 .

[0033] The air compressor 1 or compressor 7 is only used for distinction, and in essence they are both air compression and boosting equipment; the same applies to hydraulic pumps or liquid air pumps, and high-pressure pumps.

[0034] A distillation unit 9 is provided: the liquid air coming out of the liquid storage tank 3 is pressurized by the liquid air pump 8 and then enters the distillation unit 9 to produce liquid oxygen 10 and gaseous nitrogen for output.

[0035] A liquefaction unit 11 is provided: the gaseous nitrogen produced from the distillation unit 9 passes through the liquefaction unit 11 to produce liquid nitrogen 12.

[0036] The distillation unit 9 is designed, installed and operated with reference to the distillation tower of the air separation device.

[0037] The liquefaction unit 11 is implemented by a conventional compression refrigeration process or a low-temperature expansion machine process.

[0038] The air in the high-pressure gas transmission device is in an isobaric liquefaction process, which means that the raw air entering the cooling unit 2 does not need to be expanded, depressurized and refrigerated like the traditional air separation process. The air coming out of the compressor only has resistance losses of equipment and pipelines along the way, and can be regarded as an isobaric liquefaction process of air with little pressure change.

[0039] The air purification and purification equipment in the high-pressure gas transmission device, wherein the purification equipment includes a molecular sieve purifier, a reversible cooler or a stone cooler, etc., should be able to ensure the continuous and normal operation of the process.

[0040] Parts not mentioned in the present invention, such as safety accessories, instruments, meters, automatic control, etc., are equipped with existing well-known technologies, and existing mature, reliable and reasonable technical measures can be applied to this device.

[0041] Although the present invention has been disclosed as above with preferred embodiments, they are not intended to limit the present invention. Anyone familiar with the art can make various changes or modifications without departing from the spirit and scope of the present invention, which also belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the definition of the claims of this application.

Claims

1. A high-pressure gas transmission device, It is characterized in that The device realizes high-pressure gas transmission through a supplementary cooling circuit, and the process is as follows: air is liquefied by a compressor (1) and a cooling unit (2) to obtain liquid air, which is then sent to a liquid storage tank (3); the liquid air in the liquid storage tank (3) is gasified by a high-pressure pump (14) and a cooling unit (2) to form high-pressure air (15); The supplementary cooling circuit refers to the liquid air coming out of the liquid storage tank (3), which is gasified by the hydraulic pump (4) and the cooling unit (2), then enters the low-temperature expansion machine (5) and the cooling unit (2) to recover the cold and then is discharged, and then liquefied by the compressor (1) or the compressor (7) and the cooling unit (2), and enters the liquid storage tank (3). The low-temperature expansion machine (5) drags the brake (6), thereby forming a supplementary cooling circuit for the device.

2. The high-pressure gas transmission device according to claim 1, Features: The air compression and cooling process in the high-pressure gas transmission device also includes air purification and purification, which is used to remove solid matter and impurity gases in the air; the air purification and purification equipment is integrated in the compressor (1) and / or the compressor (7) and / or the cold exchange unit (2), or integrated in the connecting pipeline of the compressor (1), the compressor (7) and the cold exchange unit (2).

3. The high-pressure gas transmission device according to claim 1, Features: A distillation unit (9) is provided: liquid air from the liquid storage tank (3) is pressurized by a liquid air pump (8) and then enters the distillation unit (9) to produce liquid oxygen (10) and gaseous nitrogen for output.

4. The high-pressure gas transmission device according to claim 3, Features: A liquefaction unit (11) is provided: the gaseous nitrogen produced by the distillation unit (9) is passed through the liquefaction unit (11) to produce liquid nitrogen (12).

5. The high-pressure gas transmission device according to claim 1, Features: The brake (6) comprises a fan, a liquid pump, a compressor or an air compressor.

6. The high-pressure gas transmission device according to claim 2, Features: The purification equipment includes a molecular sieve purifier, a reversible cooler or a stone cooler.

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