CN107702432B

CN107702432B - Gas preparation system and system for generating electricity by using air separation and preparation equipment

Info

Publication number: CN107702432B
Application number: CN201711080782.4A
Authority: CN
Inventors: 翁志远
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-11-06
Filing date: 2017-11-06
Publication date: 2024-02-09
Anticipated expiration: 2037-11-06
Also published as: CN107702432A

Abstract

The invention relates to the technical field of gas preparation heat energy recycling, in particular to a gas preparation system and a system for generating power by utilizing air separation and preparation equipment. The gas preparation system comprises a gas preparation pipeline and a heat energy utilization pipeline; the gas preparation pipeline comprises a gas pipeline inlet, a gas precooling device and a gas pipeline outlet which are sequentially communicated; the heat energy utilization pipeline comprises N circulation loops; when N is 1, the first circulation loop comprises a gas precooling device, a first-stage steam turbine, a first-stage condenser and a first-stage liquid pump; when N is more than or equal to 2, the Nth circulation loop comprises an N-1 level condenser, an N level steam turbine, an N level condenser and an N level liquid pump. The system for generating electricity using the air separation and preparation apparatus includes a gas preparation system. The gas preparation system and the system for generating power by using the air separation and preparation equipment provided by the invention are used for solving the technical problem of heat energy waste in the prior art.

Description

Gas preparation system and system for generating electricity by using air separation and preparation equipment

Technical Field

The invention relates to the technical field of gas preparation heat energy recycling, in particular to a gas preparation system and a system for generating power by utilizing air separation and preparation equipment.

Background

Air separation is a set of industrial equipment for separating all component gases in air to produce oxygen, nitrogen and argon, and rare gases such as helium, neon, argon, krypton, xenon and radon. The existing air separation precooling device discharges heat energy to the atmosphere in a water cooling mode, so that the heat energy is not well utilized, and a large amount of heat energy is wasted.

The liquefied natural gas technological process is to condense and compress natural gas into low temperature liquid. At present, a water cooling mode is generally adopted to discharge heat energy generated in the preparation and liquefaction processes of natural gas into the atmosphere, so that the heat energy is not well utilized, and a large amount of heat energy is wasted.

Disclosure of Invention

The invention aims to provide a gas preparation system so as to solve the technical problem of heat energy waste in the prior art.

The invention also aims to provide a system for generating electricity by using the air separation and preparation equipment, so as to solve the technical problem of heat energy waste in the prior art.

Based on the first object, the gas preparation system provided by the invention comprises a gas preparation pipeline and a heat energy utilization pipeline;

the gas preparation pipeline comprises a gas pipeline inlet, a gas precooling device and a gas pipeline outlet which are sequentially communicated;

A gas compression device is arranged between the gas pipeline inlet and the gas precooling device, or a gas compression device is arranged between the gas precooling device and the gas pipeline outlet;

the heat energy utilization pipeline comprises N circulation loops for circulating a gas-liquid phase change medium; wherein N is an integer greater than or equal to 1;

when N is 1, the first circulation loop comprises a gas precooling device, a first-stage steam turbine or a first-stage expander, a first-stage condenser and a first-stage liquid pump which are communicated end to end in sequence; when N is an integer greater than or equal to 2, the Nth circulation loop comprises an N-1 stage condenser, an N stage steam turbine or an N stage expander, an N stage condenser and an N stage liquid pump which are communicated end to end in sequence; the N-1 stage condenser is used for enabling the N medium flowing through the N circulation loop to cool the N-1 stage turbine or the N-1 medium output by the N-1 stage expander; the N-stage condenser is used for cooling an N medium output by the N-stage steam turbine or the N-stage expander; the first medium of the first circulation loop is a low-temperature liquid medium; the N medium is a low-temperature liquid medium with the boiling point lower than 0 ℃ under standard atmospheric pressure;

the gas pre-cooling device is used for enabling the first medium of the first circulation loop of the heat energy utilization pipeline to cool the gas preparation medium of the gas preparation pipeline.

The alternative technical scheme of the invention is that the gas preparation pipeline comprises a gas heat exchange device; the gas heat exchange device is used for cooling a gas preparation medium flowing from the gas pipeline inlet to the gas pipeline outlet;

the gas pipeline inlet, the gas compression device, the gas precooling device and the gas heat exchange device are sequentially communicated; or the gas pipeline inlet, the gas precooling device, the gas compression device and the gas heat exchange device are sequentially communicated.

The alternative technical scheme of the invention is that the gas preparation pipeline comprises a gas filtering device and a gas purifying device;

the gas pipeline inlet, the gas filtering device, the gas compression device, the gas precooling device, the gas purifying device and the gas heat exchange device are sequentially communicated;

or the gas pipeline inlet, the gas filtering device, the gas precooling device, the gas compression device, the gas purification device and the gas heat exchange device are sequentially communicated;

or the gas pipeline inlet, the gas filtering device, the gas pre-cooling device, the gas purifying device, the gas compressing device and the gas heat exchanging device are sequentially communicated.

The optional technical scheme of the invention is that the outlet of the gas pipeline is communicated with the gas separation device;

the gas heat exchange device comprises a gas feedback heat exchange device and a gas power generation heat exchange device; the gas feedback heat exchange device is arranged between the gas power generation heat exchange device and the gas separation device;

the gas feedback heat exchange device is used for cooling the gas preparation medium output by the gas separation device, and the gas preparation medium flows from the gas precooling device to the gas pipeline outlet;

the gas power generation heat exchange device is used for enabling the N medium of the heat energy utilization pipeline to cool the gas preparation medium of the gas preparation pipeline; the two ends of the gas precooling device or the N-level condenser are respectively communicated with the two ends of the gas power generation heat exchange device; wherein N is an integer greater than or equal to 1.

According to the alternative technical scheme, a gas expander is arranged between the gas feedback heat exchange device and the gas separation device.

The optional technical scheme of the invention is that the heat energy utilization pipeline comprises a cooling straight pipeline; the cooling straight-line pipeline comprises a gas separation device, the N-level condenser and a cooling straight-line output end which are sequentially communicated; the N-stage condenser is used for enabling the gas preparation medium in the gas separation device to cool the N-stage steam turbine or the N-th medium output by the N-stage expander, and conveying the N-stage medium to the cooling straight-discharge output end for discharging.

The optional technical scheme of the invention is that the heat energy utilization pipeline comprises a cooling straight pipeline; the cooling straight-line pipeline comprises a cooling straight-line low-temperature working medium storage, the N-level condenser and a cooling straight-line output end which are sequentially communicated; the N-stage condenser is used for enabling the cooling direct-discharge medium in the cooling direct-discharge low-temperature working medium storage to cool the N-stage steam turbine or the N-th medium output by the N-stage expansion machine, and conveying the N-th medium to the cooling direct-discharge output end for discharge;

a cooling direct-discharge liquid pump is arranged between the cooling direct-discharge low-temperature working medium storage and the N-stage condenser, and the cooling direct-discharge liquid pump is used for enabling a cooling direct-discharge medium in the cooling direct-discharge low-temperature working medium storage to be conveyed to the N-stage condenser;

and a cooling storage outlet valve is arranged between the cooling direct-discharge low-temperature working medium storage and the cooling direct-discharge liquid pump.

The gas preparation system comprises an indirect heat exchange circulation loop;

the indirect heat exchange circulation loop comprises a gas heat exchange device, an indirect compression device, an indirect heat exchange device and an indirect throttle valve which are communicated end to end in sequence;

the gas heat exchange device is used for cooling the indirect circulating medium of the indirect heat exchange circulating loop to prepare a gas medium flowing from the gas precooling device to the outlet of the gas pipeline;

The indirect heat exchange device is used for enabling the N medium of the heat energy utilization pipeline to cool the indirect circulating medium of the indirect heat exchange circulating loop; and two ends of the gas precooling device or the N-stage condenser are respectively communicated with two ends of the indirect heat exchange device.

According to the optional technical scheme, when N is an integer greater than or equal to 1, an N-level low-temperature working medium storage device for storing an N-th medium is arranged between the N-level condenser and the N-level liquid pump;

an N-level condensing pump is communicated between the N-level condenser and the N-level low-temperature working medium storage; the N-level condensing pump is used for enabling an N medium flowing through the N-level condenser to be input into the N-level low-temperature working medium storage;

an N-stage liquid separator is communicated between the N-stage condenser and the N-stage condensing pump; the N-stage liquid separator is used for separating an N medium of the N-th circulation loop and conveying the N medium in a liquid phase to the N-stage condensation pump;

an N-level storage inlet valve is arranged between the N-level condensing pump and the N-level low-temperature working medium storage; an N-level storage outlet valve is arranged between the N-level liquid pump and the N-level low-temperature working medium storage;

the N-level low-temperature working medium storage is provided with an N-level storage compensation exhaust valve; the N-level storage compensation exhaust valve is used for compensating or exhausting the medium in the N-level low-temperature working medium storage;

The N-stage condenser is provided with an N-stage condensation compensation exhaust valve; the N-stage condensation compensation exhaust valve is used for compensating or discharging the medium in the N-stage condenser;

the N-stage steam turbine and the N-stage condenser are integrated, or the N-stage expansion machine and the N-stage condenser are integrated;

the Nth circulation loop is provided with one or more circulation loop discharge valves, and the circulation loop discharge valves are used for discharging medium in the Nth circulation loop;

the N-stage steam turbine or the N-stage expansion machine, the N-stage condenser and the N-stage liquid pump are sleeved with heat insulation layers;

when N is an integer greater than or equal to 2, the boiling point of the N medium is not higher than the boiling point of the N-1 medium;

when N is an integer greater than or equal to 1, the N medium is carbon dioxide, ammonia, helium, hydrogen, oxygen, argon, nitrogen, freon, methane, ethane, propane, natural gas, coal gas or methane;

when N is an integer greater than or equal to 1, the N-stage steam turbine or the N-stage expander is in driving connection with an N-stage generator or driving power equipment;

the gas preparation medium is gas with the boiling point below zero at normal temperature and normal pressure; the gas preparation medium is air, natural gas, methane, ethane, oxygen, nitrogen, argon, hydrogen or helium;

The gas precooling device is sleeved with an insulating layer;

the gas compression device is sleeved with an insulating layer;

and the gas heat exchange device is sleeved with an insulating layer.

Based on the second object, the system for generating electricity by using the air separation and preparation equipment provided by the invention comprises the gas preparation system.

The invention has the beneficial effects that:

the invention provides a gas preparation system, which comprises a gas preparation pipeline; the gas preparation pipeline specifically comprises a gas pipeline inlet, a gas precooling device, a gas pipeline outlet and a gas compression device, so that gas preparation can be realized, for example, oxygen, nitrogen, argon and the like are prepared by adopting air separation, and natural gas available for production and life is prepared by natural gas in nature; the gas preparation system further comprises a heat energy utilization pipeline, N circulation loops for circulating the gas-liquid phase change medium are arranged in the heat energy utilization pipeline, and the first medium of the first circulation loop of the heat energy utilization pipeline is used for cooling the gas preparation medium of the gas preparation pipeline through the gas precooling device, so that the heat energy in the gas precooling device is utilized and converted into rotary mechanical energy output by the 1-N-stage steam turbine or the 1-N-stage expander through the heat energy utilization pipeline, the heat energy in the gas preparation pipeline is effectively utilized, and the waste of the heat energy is reduced.

The system for generating power by using the air separation and preparation equipment comprises the gas preparation system, so that heat energy in a gas preparation pipeline can be effectively utilized, and waste of heat energy is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a first process of a gas preparation system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a second process of the gas preparation system according to the first embodiment of the present invention;

FIG. 3 is a schematic view of a first flow chart of a thermal energy utilization pipeline of a gas production system according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a second flow path of a heat energy utilization pipeline of a gas preparation system according to an embodiment of the invention.

Icon: 800-a gas preparation pipeline; 810-gas line inlet; 820-a gas filtration device; 830-gas compression means; 840-a gas purification device; 850-gas heat exchange device; 851-gas feedback heat exchange means; 852-a gas-powered heat exchange device; 860-gas line outlet; 870-gas separation device; 880-a gas expander; 890-indirect compression means; 891-indirect heat exchange means; 892-indirect throttle valve;

100-a heat energy utilization pipeline; 101-a gas pre-cooling device; 102-a primary turbine; 103-a first-stage condenser; 1031-a first-stage condensation compensation exhaust valve; 104-a primary liquid separator; 105-a first-stage condensing pump; 106-a first-stage low-temperature working medium storage; 1061-stage one reservoir inlet valve; 1062—a primary reservoir outlet valve; 1063—Primary reservoir Compensation exhaust valve; 107-primary liquid pump; 108-a primary generator;

202-a secondary turbine; 203-a two-stage condenser; 204-a secondary liquid separator; 205-a secondary condensate pump; 206-a secondary low-temperature working medium storage; 2061-a secondary storage inlet valve; 2062-a secondary reservoir outlet valve; 207-a secondary liquid pump; 208-a secondary generator;

302-three stage steam turbine; 303-a three-stage condenser; 304-a three-stage liquid separator; 305-a three-stage condensing pump; 306-three-stage low-temperature working medium storage; 3061-three stage storage inlet valve; 3062-three stage reservoir outlet valve; 307-three stage liquid pump; 308-three-stage generator;

401-a compressor; 402-a heat exchanger; 403-refrigeration liquid separator; 404-refrigerating a low-temperature working medium storage; 4041-refrigeration storage inlet valve; 4042-refrigeration storage outlet valve; 405-a refrigeration turbine; 406-a refrigeration generator; 407-a compressed inlet liquid separator; 408-cooling the direct-discharge low-temperature working medium storage; 4081-cooling reservoir outlet valve; 409-cooling in-line liquid pump; 410-cooling in-line valve;

501-a heat exchange exhaust valve; 502-a recirculation loop drain valve.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

Referring to fig. 1-4, the present embodiment provides a gas preparation system; fig. 1 and fig. 2 are a first flow chart and a second flow chart of the gas preparation system provided in this embodiment, where fig. 1 may be a flow chart of a space division preparation and utilization system, and fig. 2 may be a flow chart of a natural gas preparation and utilization system; fig. 3 and 4 are a first flow chart and a second flow chart of a heat energy utilization pipeline of the gas preparation system according to the present embodiment. The ports a and B of the gas pre-cooling apparatus 101 shown in fig. 1 or fig. 2 are the ports a and B of the gas pre-cooling apparatus 101 shown in fig. 3 or fig. 4; the ports C and D shown in FIG. 1 or FIG. 2 are used to connect the two ends of the gas pre-cooling device 101 or the N-stage condenser shown in FIG. 3 or FIG. 4; the E port shown in fig. 1 is the output.

Referring to fig. 1-4, the gas preparation system provided in this embodiment is applied to the preparation of air separation, natural gas, methane, ethane, oxygen, nitrogen, argon, hydrogen or helium.

The gas preparation system includes a gas preparation line 800 and a thermal energy utilization line 100.

The gas preparation line 800 includes a gas line inlet 810, a gas pre-cooling device 101, and a gas line outlet 860, which are sequentially communicated; optionally, gas preparation line 800 includes a gas line inlet 810, a gas pre-cooling device 101, a gas heat exchange device 850, and a gas line outlet 860 in sequential communication; gas heat exchanger 850 is used to cool the gaseous preparation medium flowing from gas pre-cooler 101 to gas line outlet 860.

A gas compression device 830 is arranged between the gas pipeline inlet 810 and the gas precooling device 101, or a gas compression device 830 is arranged between the gas precooling device 101 and the gas pipeline outlet 860; that is, the gas compression device 830 may be disposed before the gas pre-cooling device 101 or may be disposed after the gas pre-cooling device 101. Alternatively, the gas compression device 830 may be a reciprocating piston compressor, a centrifugal compressor, a screw compressor, or the like. Optionally, gas line inlet 810, gas compression apparatus 830, gas pre-cooling apparatus 101, and gas heat exchange apparatus 850 are in communication in sequence; alternatively, gas line inlet 810, gas pre-cooling apparatus 101, gas compression apparatus 830, and gas heat exchange apparatus 850 are in communication in sequence. The order among the gas line inlet 810, the gas compression device 830, the gas pre-cooling device 101, and the gas heat exchange device 850 may be set according to the gas actually prepared.

The heat energy utilization pipeline 100 comprises N circulation loops through which a gas-liquid phase medium flows; wherein N is an integer greater than or equal to 1; n may be, for example, 1, 2, 3, 4, 5, etc.

When N is 1, the first circulation loop comprises a gas precooling device 101, a first-stage steam turbine 102 or a first-stage expander, a first-stage condenser 103 and a first-stage liquid pump 107 which are sequentially communicated from end to end; optionally, the first medium of the first circulation loop is a gas-liquid phase medium. Optionally, the primary liquid pump 107 delivers the first medium flowing through the primary condenser 103 to the gas pre-cooling device 101, and after the heat exchange between the first medium and the gas pre-cooling device 101, the temperature of the first medium rises to be in all or part of a gaseous state, that is, the first medium is converted into all or part of a gaseous state by absorbing heat in all or part of a liquid state. In certain circumstances, the first medium can develop a high pressure that can drive the primary turbine 102 or the primary expander to perform work. Optionally, the primary turbine 102 or the primary expander is in driving connection with the primary generator 108, so as to convert the heat energy of the gas preparation pipeline 800 into the electric energy of the primary generator 108 through the gas precooling device 101 to a certain extent, thereby improving the power generation efficiency. In addition, the primary turbine 102 or primary expander may also be drivingly coupled to other rotating equipment, such as power equipment. Optionally, the first medium of the first circulation loop is a cryogenic liquid medium; optionally, the first medium of the first circulation loop is a low temperature liquid medium having a boiling point below 0 degrees celsius at normal atmospheric pressure.

When N is an integer greater than or equal to 2, the N-th circulation loop comprises an N-1 stage condenser, an N stage steam turbine or an N stage expander, an N stage condenser and an N stage liquid pump which are communicated end to end in sequence. The N-1 stage condenser is used for cooling the N medium flowing through the N circulation loop to the N-1 stage turbine or the N-1 medium output by the N-1 stage expander. Optionally, the N-stage liquid pump conveys the nth medium flowing through the N-stage condenser to the N-1 stage condenser, and in the N-1 stage condenser, the nth medium exchanges heat with the nth medium, and the nth medium is cooled to be in a full or partial liquid state, that is, the nth medium is in a full or partial gaseous state to release heat and is converted to be in a full or partial liquid state, and the nth medium is heated to be in a full or partial gaseous state, that is, the nth medium is in a full or partial liquid state to absorb heat and is converted to be in a full or partial gaseous state. In certain circumstances, the nth medium can develop high pressure, which can drive an N-stage turbine or an N-stage expander to do work. Optionally, the N-stage turbine or the N-stage expander is in driving connection with the N-stage generator, so that heat energy of an N-1 medium flowing through the N-1 stage condenser is converted into electric energy of the N-stage generator to a certain extent, and the power generation efficiency is improved. In addition, the N-stage steam turbine or the N-stage expander can be in driving connection with other rotary devices, such as power equipment. Optionally, the nth medium of the nth circulation loop is a low temperature liquid medium having a boiling point below 0 degrees celsius at normal atmospheric pressure.

The N-stage condenser is used for cooling the N medium output by the N-stage steam turbine or the N-stage expander. That is, when the system includes a recycle loop, the primary condenser is used to cool the first medium output by the primary turbine or the primary expander; when the system comprises two circulation loops, the secondary condenser is used for cooling a second medium output by the secondary steam turbine or the secondary expander; and so on.

When N is an integer greater than or equal to 1, the N-stage steam turbine or the N-stage expansion machine is in driving connection with the generator; to convert mechanical energy of rotation of a one-to-N turbine or one-to-N expander into electrical energy. When the system comprises a circulation loop, a first-stage turbine or a first-stage expander is in driving connection with a first-stage generator, and the generator of the system comprises a first-stage generator; when the system comprises two circulation loops, the first-stage turbine or the first-stage expander is in driving connection with the first-stage generator, the second-stage turbine or the second-stage expander is in driving connection with the second-stage generator, and the generator of the system comprises the first-stage generator and the second-stage generator; and so on.

The gas pre-cooling device 101 is configured to cool the first medium of the first circulation loop of the heat energy utilization pipeline 100 by the gas preparation medium of the gas preparation pipeline 800, so that the first circulation loop of the heat energy utilization pipeline 100 and the gas preparation pipeline 800 exchange heat with each other through the gas pre-cooling device 101 to recycle the heat energy in the gas preparation pipeline 800.

Optionally, the gas pre-cooling device 101 is covered with a heat-insulating layer to reduce heat exchange with the outside temperature.

Optionally, the gas compression device 830 is coated with a heat insulating layer to reduce heat exchange with the outside temperature.

Optionally, the gas heat exchange device 850 is sheathed with a thermal insulation layer to reduce heat exchange with ambient temperature.

Other places of the gas preparation system described in this embodiment where heat preservation is required also require some corresponding heat preservation measures.

The gas preparation system in this embodiment includes a gas preparation line 800; the gas preparation line 800 specifically includes a gas line inlet 810, a gas pre-cooling device 101, a gas line outlet 860, and a gas compression device 830, so as to enable preparation of gas, for example, preparation of oxygen, nitrogen, argon, etc. by air separation, preparation of natural gas available for production and life by natural gas in nature, etc.; the gas preparation system further comprises a heat energy utilization pipeline 100, the N circulation loops of the heat energy utilization pipeline 100 are used for circulating the gas-liquid phase change medium, and the first medium of the first circulation loop of the heat energy utilization pipeline 100 is used for cooling the gas preparation medium of the gas preparation pipeline 800 through the gas pre-cooling device 101, so that the heat energy in the gas pre-cooling device 101 is utilized and converted into the rotating mechanical energy output by the 1-N-stage steam turbine or the 1-N-stage expansion machine through the heat energy utilization pipeline 100, the heat energy in the gas preparation pipeline 800 is effectively utilized, and the waste of the heat energy is reduced.

Referring to fig. 1, in an alternative to the present embodiment, a gas preparation line 800 includes a gas filtering device 820 and a gas purifying device 840; dust and other impurities contained in the gas preparation medium are filtered through the gas filtering device 820 so as to reduce abrasion of the mechanical moving surface inside the gas compression device 830 and ensure the quality of the gas preparation medium; through the gas purification device 840, to filter, adsorb, or remove moisture, carbon dioxide, acetylene, other hydrocarbons, and the like contained in the gas production medium; for example, clogging of channels, pipes and valves due to frozen moisture and carbon dioxide deposition, clogging in air separation columns such as pipes, valves, gas separation units, etc. can be avoided or reduced to some extent. As another example, acetylene accumulates in liquid oxygen with the risk of explosion, and dust wears the operating machinery. In order to ensure long-term safe operation of the air separation, natural gas, etc., production facilities, it is necessary to provide a gas filtering device 820 and/or a gas purifying device 840 to remove some impurities with a special purifying apparatus. The gas purification device 840 may purify gas using adsorption and freezing methods, for example, using molecular sieve adsorption. Optionally, the gas filter 820 is covered with a thermal insulation layer to reduce heat exchange with ambient temperature. Optionally, the gas purification device 840 is coated with a thermal insulation layer to reduce heat exchange with ambient temperature. Other places needing heat preservation also need to take some corresponding heat preservation measures.

Alternatively, the number of the gas purifying devices 840 is two, and the two gas purifying devices 840 are arranged in parallel; so that the two gas purification devices 840 are used interchangeably during regeneration. I.e. one of the purification devices is in operation and the other purification device is regenerated. Alternatively, the gas purification apparatus 840 is used interchangeably with two molecular sieve devices.

Optionally, gas line inlet 810, gas filtration device 820, gas compression device 830, gas pre-cooling device 101, gas purification device 840, and gas heat exchange device 850 are in communication in sequence;

alternatively, gas line inlet 810, gas filtration device 820, gas pre-cooling device 101, gas compression device 830, gas purification device 840, and gas heat exchange device 850 are in communication in sequence;

alternatively, gas line inlet 810, gas filtration apparatus 820, gas pre-cooling apparatus 101, gas purification apparatus 840, gas compression apparatus 830, and gas heat exchange apparatus 850 are in communication in sequence. The order among the gas line inlet 810, the gas filtering device 820, the gas compressing device 830, the gas pre-cooling device 101, the gas purifying device 840 and the gas heat exchanging device 850 may be set according to the gas actually prepared.

Referring to fig. 1, in an alternative to this embodiment, the gas line outlet 860 communicates with a gas separation device 870. The desired gas is separated by the gas separation device 870, and may be in a gaseous state, a liquid state, or a gas-liquid mixed state. For example, the gas separation device 870 is an air separation column, and the air separation system produces oxygen, nitrogen, argon, and the like through the gas separation device 870. Optionally, the gas separation device 870 is coated with a heat insulating layer to reduce heat exchange with the outside temperature.

Alternatively, the gas heat exchange device 850 includes a gas feedback heat exchange device 851 and a gas generating heat exchange device 852; the gas feedback heat exchange device 851 is disposed between the gas power generation heat exchange device 852 and the gas separation device 870.

Optionally, the gas feedback heat exchange device 851 is configured to cool the gas preparation medium output from the gas separation device 870, and the gas preparation medium flows from the gas pre-cooling device 101 to the gas pipeline outlet 860; the gas preparation medium flowing from the gas pre-cooling device 101 to the gas pipeline outlet 860 is directly cooled by the part of the low-temperature medium output by the gas separation device 870 through the gas feedback heat exchange device 851, so that the gas separation device 870 can prepare gas more easily. Alternatively, the gas preparation medium output from the gas separation device 870 is discharged through the gas feedback heat exchange device 851, and as shown in fig. 2, the gas preparation medium output from the gas separation device 870 is discharged through the E port of the gas feedback heat exchange device 851.

Optionally, the gas generating heat exchange device 852 is configured to enable the nth medium of the heat energy utilization pipeline 100 to cool the gas preparation medium of the gas preparation pipeline 800; both ends of the gas pre-cooling device 101 or the N-stage condenser are respectively communicated with both ends of the gas power generation heat exchange device 852, that is, the gas pre-cooling device 101 or the N-stage condenser is arranged in parallel with the gas power generation heat exchange device 852. Wherein N is an integer greater than or equal to 1. The gas preparation medium of the gas preparation line 800 is cooled by the gas power generation heat exchange device 852, and at the same time, the heat energy of the gas preparation medium of the gas preparation line 800 may be exchanged to the nth medium, so that the heat energy is converted into the rotational mechanical energy output by the steam turbine or the expander by the heat energy utilization line 100. As shown in fig. 1, 3 and 4, the C and D ports of the gas power generation heat exchange device 852 are used to connect two ends of the gas pre-cooling device 101 or the N-stage condenser shown in fig. 3 or 4.

Optionally, a gas expander 880 is provided between the gas feedback heat exchange device 851 and the gas separation device 870. The medium output from the gas separator 870 passes through the gas expander 880, and the temperature of the medium drops sharply after expansion, so that the gas feedback heat exchanger 851 is beneficial to cool the gas preparation medium flowing from the gas precooling device 101 to the gas pipeline outlet 860. The gas expander 880 may be, for example, a rotary vane machine.

Referring to fig. 3, in an alternative of the present embodiment, the heat energy utilization line 100 includes a refrigeration cycle through which a gas-liquid phase change medium flows; and cooling the N medium output by the N-stage steam turbine or the N-stage expander through a refrigeration cycle loop.

Specifically, the refrigeration cycle circuit includes an N-stage condenser, a compressor 401, a heat exchanger 402, a refrigeration turbine 405, or a refrigeration expander or expansion valve, which are connected in this order from the beginning to the end. That is, the N-stage condenser, the compressor 401, the heat exchanger 402, and the refrigeration turbine 405 are connected end to end in this order and form a refrigeration cycle loop; or the N-stage condenser, the compressor 401, the heat exchanger 402 and the refrigeration expander are communicated end to end in sequence to form a refrigeration cycle loop; alternatively, the N-stage condenser, the compressor 401, the heat exchanger 402, and the expansion valve are sequentially connected end to form a refrigeration cycle.

The N-stage condenser is used for enabling the refrigeration medium flowing through the refrigeration cycle loop to cool the N-stage turbine or the N-th medium output by the N-stage expander.

The compressor 401 is used for compressing a refrigerant medium, and cooling the refrigerant medium through the heat exchanger 402, and delivering the cooled refrigerant medium to the refrigeration turbine 405 or the refrigeration expander or the expansion valve, so as to drive the refrigeration turbine 405 or the refrigeration expander to rotate. Optionally, the refrigeration turbine 405 or the refrigeration expander is drivingly connected to the refrigeration generator 406, so as to convert the thermal energy of the nth medium flowing through the N-stage condenser into the electrical energy of the refrigeration generator 406 to a certain extent, thereby improving the power generation efficiency. In addition, the refrigeration turbine 405 or the refrigeration expander can be in driving connection with other rotating devices, for example, the refrigeration turbine 405 or the refrigeration expander is in driving connection with a compressor, so that mechanical energy can be fed back to the compressor.

Optionally, the refrigeration medium of the refrigeration cycle is a low-temperature liquid medium with a boiling point lower than 0 ℃. Optionally, the boiling point of the refrigeration medium is not higher than the boiling point of the nth medium, so that the refrigeration medium cools the nth medium within the N-stage condenser. Alternatively, the refrigeration medium is an inorganic cryogenic medium or an organic cryogenic medium. Optionally, the refrigeration medium has a boiling point below-30 ℃. The refrigeration medium can be, for example, carbon dioxide, ammonia, helium, hydrogen, oxygen, argon, nitrogen, freon, methane, ethane, propane, natural gas, coal gas, biogas, or the like; of course, the refrigerant medium may also be other cryogenic medium. Preferably, the refrigeration medium is methane, ethane or a medium having a boiling point lower than methane, ethane.

Optionally, the refrigeration medium of the refrigeration cycle is a gas-liquid phase-change medium, that is, the refrigeration medium performs a conversion between a gas phase and a liquid phase in the refrigeration cycle. Optionally, the refrigerant medium compressed by the compressor 401 and cooled by the heat exchanger 402 is in a liquid state in all or part, and after the refrigerant medium passes through the refrigeration turbine 405 or the refrigeration expander to perform work, the pressure is released and is in a gas state in all or part.

In an alternative to this embodiment, heat exchanger 402 is disposed between an N-stage liquid pump and an N-1 stage condenser; after the compressor 401 compresses the refrigerant, the temperature of the refrigerant rises, and the nth medium of the nth circulation loop exchanges heat with the refrigerant of the refrigeration circulation loop through the heat exchanger 402, that is, the refrigerant is cooled by the nth medium to form all or part of liquid, and the nth medium is heated by the refrigerant to form part of gas. In theory, after the nth medium is heated by the heat exchanger 402, heat energy generated by compressing the refrigeration medium by the compressor 401 can be effectively utilized, so that the energy utilization rate of the system is improved, and the energy loss is reduced.

Optionally, a heat exchange exhaust valve 501 for exhaust is arranged on the pipeline between the heat exchanger 402 and the N-1 stage condenser. The pressure on the line between the heat exchanger 402 and the N-1 stage condenser can be relieved by a heat exchange vent valve 501. For example, after the nth medium is heated by the refrigerant medium to form a part of gas, the pressure of the pipeline increases sharply, and part of the pressure is released through the heat exchange exhaust valve 501, so as to improve the operation safety of the nth circulation loop and the safety of the system.

Optionally, a compression inlet liquid separator 407 is in communication between the N-stage condenser and the compressor 401; the compression inlet liquid separator 407 is used to separate the refrigerant medium of the refrigeration cycle and deliver the refrigerant medium in the vapor phase to the compressor 401; by compressing the inlet liquid separator 407, the refrigerant medium delivered to the compressor 401 is ensured to be gas, thereby improving the service life of the compressor 401.

Optionally, a refrigeration low-temperature working medium storage 404 is communicated between the refrigeration steam turbine 405 or the refrigeration expansion machine or the expansion valve and the heat exchanger 402; to store the refrigerant through the refrigerant low temperature working fluid storage 404 and to improve the stability of the refrigeration cycle. The refrigeration low-temperature working medium storage 404 is used for storing a refrigeration medium, so that the stability of the refrigeration cycle can be improved to a certain extent.

Optionally, a refrigeration liquid separator 403 is communicated between the heat exchanger 402 and the refrigeration cryogenic medium storage 404; the refrigeration liquid separator 403 is used for separating the refrigeration medium of the refrigeration cycle loop, and delivering the refrigeration medium in liquid phase to the refrigeration low-temperature working medium storage 404; the refrigerant medium delivered to the refrigerant cryogenic fluid reservoir 404 is ensured to be a liquid by the refrigerant liquid separator 403.

Optionally, a refrigeration storage inlet valve 4041 is disposed between the refrigeration cryogenic working fluid storage 404 and the refrigeration liquid separator 403; a refrigeration storage outlet valve 4042 is arranged between the refrigeration turbine 405 or the refrigeration expander or the expansion valve and the refrigeration cryogenic working medium storage 404. The refrigerating low-temperature working medium storage 404 can form independent low-temperature working medium storage equipment through the refrigerating storage inlet valve 4041 and the refrigerating storage outlet valve 4042, and can circulate and separate the refrigerating medium in the N-stage condenser, the compressor 401 and other equipment of the refrigerating circulation loop so as to operate the protection and control system under specific conditions.

Referring to fig. 3 and 4, in an alternative of the present embodiment, the heat energy utilization line 100 includes a cooling inline line; the N medium output by the N-stage turbine or the N-stage expander is cooled by the cooling straight-line pipeline.

Specifically, the cooling direct-discharge pipeline comprises a cooling direct-discharge low-temperature working medium storage 408, an N-stage condenser and a cooling direct-discharge output end which are sequentially communicated; optionally, a cooling in-line liquid pump 409 is arranged between the cooling in-line cryogenic fluid storage 408 and the N-stage condenser; the cooling direct-discharge pipeline comprises a cooling direct-discharge low-temperature working medium storage 408, a cooling direct-discharge liquid pump 409, an N-level condenser and a cooling direct-discharge output end which are sequentially communicated; optionally, the cooling inline output is provided with a cooling inline valve 410. Optionally, a cooling reservoir outlet valve 4081 is disposed between the cooling in-line cryogenic fluid reservoir 408 and the cooling in-line liquid pump 409; the on-off of the pipeline between the cooling in-line cryogenic working fluid storage 408 and the cooling in-line liquid pump 409 is controlled by the cooling storage outlet valve 4081.

The cooling in-line liquid pump 409 is configured to send the cooling medium in the cooling in-line cryogenic medium storage 408 to the N-stage condenser and discharge the cooling medium through the cooling in-line output, which may be referred to as a cooling in-line valve 410. For example, the cool in-line valve 410 is opened and the cool in-line medium is discharged through the cool in-line output. The N-stage condenser is used for enabling the cooling direct-discharge medium in the cooling direct-discharge low-temperature working medium storage to cool the N-stage turbine or the N-stage medium output by the N-stage expander, and conveying the N-stage medium to the cooling direct-discharge output end for discharge; the N medium output by the N-stage steam turbine or the N-stage expander is cooled in the N-stage condenser by the cooling direct-discharge medium, so that the N circulation loop can normally operate.

Optionally, the cooling in-line medium of the cooling in-line pipeline is a low-temperature liquid medium with a boiling point lower than 0 ℃. Optionally, the boiling point of the cooling in-line medium is not higher than the boiling point of the nth medium, so that the cooling in-line medium cools the nth medium in the N-stage condenser. Optionally, the cooling in-line medium is an inorganic cryogenic medium or an organic cryogenic medium. Optionally, the boiling point of the cooled in-line medium is below-30 ℃. Wherein, the cooling in-line medium can be carbon dioxide, ammonia, helium, hydrogen, oxygen, argon, nitrogen, freon, methane, ethane, propane, natural gas, coal gas or methane, etc.; of course, the cooling in-line medium may also be other cryogenic medium. Preferably, the cooling in-line medium is nitrogen or a medium having a boiling point lower than nitrogen.

Alternatively, the cooling in-line medium is a non-flammable medium, such as carbon dioxide, ammonia, helium, hydrogen, oxygen, argon, nitrogen, freon, etc., and is discharged directly. Optionally, the cooling in-line medium is a combustible medium; for example, the cooling in-line medium is methane, ethane, propane, natural gas, coal gas, or biogas, etc.

In the alternative of this embodiment, the cooling inline may also cool the N-stage condenser with a cryogenic medium prepared in the gas preparation line 800.

Specifically, the heat energy utilization line 100 includes a cooling inline line; the cooling straight-line pipeline comprises a gas separation device 870, an N-level condenser and a cooling straight-line output end which are sequentially communicated; the N-stage condenser is used for enabling the gas preparation medium in the gas separation device 870 to cool the N-th medium output by the N-stage steam turbine or the N-stage expander, and conveying the N-th medium to the cooling straight-discharge output end for discharge. The low temperature medium prepared by the gas separation device 870 directly cools the nth medium output from the N-stage turbine or the N-stage expander.

Optionally, a cooling in-line liquid pump 409 is disposed between the gas separation device 870 and the N-stage condenser, and the cooling in-line liquid pump 409 is configured to enable the gas preparation medium in the gas separation device 870 to be delivered to the N-stage condenser, where the gas preparation medium absorbs heat and is discharged through the cooling in-line output end. The N medium output by the N-stage steam turbine or the N-stage expander is cooled in the N-stage condenser by the low-temperature gas preparation medium, so that the N circulation loop can normally operate. The low temperature gaseous production medium may be, for example, nitrogen, oxygen, argon, etc. in the air.

In an alternative of the present embodiment, the heat energy utilization line 100 comprises a refrigeration cycle circuit and/or a cooling in-line, i.e. the heat energy utilization line 100 comprises a refrigeration cycle circuit, or the heat energy utilization line 100 comprises a cooling in-line, or the heat energy utilization line 100 comprises a refrigeration cycle circuit and a cooling in-line. Optionally, the heat energy utilization line 100 includes a refrigeration cycle or a cooling inline line to simplify the heat energy utilization line 100 and reduce the construction cost of the system. In addition, the heat energy utilization pipeline 100 can also comprise other devices and pipelines for cooling the Nth medium output by the N-stage steam turbine or the N-stage expander.

In an alternative scheme of the embodiment, when N is an integer greater than or equal to 1, an N-level low-temperature working medium storage is arranged between the N-level condenser and the N-level liquid pump; the N-level low-temperature working medium storage is used for storing the N medium, so that the stability of the N circulation loop can be improved to a certain extent. For example, when N is 1, a first-stage low-temperature working medium storage 106 is provided between the first-stage condenser 103 and the first-stage liquid pump 107; the primary cryogenic fluid storage 106 is used to store the first medium, so that the stability of the first circulation loop can be improved to a certain extent. Optionally, the N-level low-temperature working medium storage is sleeved with an insulating layer.

Optionally, when N is an integer greater than or equal to 1, an N-level condensation pump is communicated between the N-level condenser and the N-level low-temperature working medium storage; the N-level condensing pump is used for inputting the N medium flowing through the N-level condenser into the N-level low-temperature working medium storage; and the N medium flowing through the N-stage condenser is conveyed to the N-stage low-temperature working medium storage through the N-stage condensation pump. For example, when N is 1, a primary condensation pump 105 is communicated between the primary condenser 103 and the primary low-temperature working medium storage 106; the primary condensation pump 105 is used for inputting the first medium flowing through the primary condenser 103 into the primary low-temperature working medium storage 106; the first medium flowing through the first condenser 103 is supplied to the first-stage low-temperature working medium reservoir 106 by the first-stage condenser pump 105. Optionally, an insulating layer is sleeved outside the N-level condensing pump.

Optionally, when N is an integer greater than or equal to 1, an N-stage liquid separator is communicated between the N-stage condenser and the N-stage condensing pump; the N-stage liquid separator is used for separating an N medium of the N-th circulation loop and conveying the N medium in a liquid phase to the N-stage condensation pump; the N-stage liquid separator is used for ensuring that the N medium which is conveyed to the N-stage low-temperature working medium storage through the N-stage condensation pump is liquid. For example, when N is 1, a first-stage liquid separator 104 is communicated between the first-stage condenser 103 and the first-stage condensing pump 105; the primary liquid separator 104 is used for separating the first medium of the first circulation loop and delivering the first medium in a liquid phase to the primary condensation pump 105; the first medium is passed through the primary liquid separator 104 to ensure that the first medium delivered to the primary cryogenic fluid reservoir 106 via the primary condensate pump 105 is liquid. Optionally, the N-stage liquid separator is sheathed with an insulating layer.

Optionally, when N is an integer greater than or equal to 1, an N-stage storage inlet valve is arranged between the N-stage condensing pump and the N-stage low-temperature working medium storage; an N-level storage outlet valve is arranged between the N-level liquid pump and the N-level low-temperature working medium storage; through the N-level storage inlet valve and the N-level storage outlet valve, the N-level low-temperature working medium storage can form independent low-temperature working medium storage equipment, and can circulate and separate with N-th medium in N-level condensers, N-level liquid pumps and other equipment of an N-th circulation loop so as to operate the protection and control system under specific conditions. For example, when N is 1, a primary storage inlet valve 1061 is provided between the primary condensate pump 105 and the primary cryogenic storage 106; a primary storage outlet valve 1062 is arranged between the primary liquid pump 107 and the primary cryogenic storage 106; the primary storage inlet valve 1061 and the primary storage outlet valve 1062 enable the primary cryogenic storage 106 to form an independent cryogenic storage device, and also to circulate and separate the primary medium in the primary condenser 103, the primary liquid pump 107, etc. of the first circulation loop, so as to operate the protection and control system under specific conditions.

Optionally, when N is an integer greater than or equal to 1, the N-level low-temperature working medium storage is provided with an N-level storage compensation exhaust valve; the N-level storage compensation exhaust valve is used for compensating or exhausting the medium in the N-level low-temperature working medium storage, wherein the medium can be the N-th medium in the N-level low-temperature working medium storage or other mediums such as air in the N-level low-temperature working medium storage for the first time; the exhaust valve is compensated through the N-level storage to supplement the N medium of the N-level low-temperature working medium storage so as to compensate the N medium leaked and volatilized from the N circulation loop; the N-level low-temperature working medium storage device can also discharge the N medium which is gas in the N-level low-temperature working medium storage device through the N-level storage device compensation exhaust valve, and can reduce or avoid the pressure born by the N-level low-temperature working medium storage device or bear larger pressure to a certain extent so as to improve the safety performance of the N-level low-temperature working medium storage device. For example, when N is 1, the primary low temperature working fluid storage 106 is provided with a primary storage compensation exhaust valve 1063; the primary storage compensating exhaust valve 1063 is configured to compensate for or exhaust the first medium in the primary cryogenic working fluid storage 106; the first medium of the first-stage low-temperature working medium storage 106 can be supplemented through the first-stage storage compensation exhaust valve 1063 so as to compensate the leaked and volatilized first medium of the first circulation loop; the first medium in the first-stage cryogenic fluid reservoir 106, which is gaseous, can also be discharged through the first-stage reservoir make-up exhaust valve 1063.

Optionally, when N is an integer greater than or equal to 1, the N-stage condenser is provided with an N-stage condensation compensation exhaust valve; the N-level condensation compensation exhaust valve is used for compensating or discharging media in the N-level condenser, wherein the media can be the N-th media in the N-level condenser or other media such as air in the N-level condenser for the first time. The N medium of the N-stage condenser can be supplemented through the N-stage condensation compensation exhaust valve so as to compensate the N medium leaked and volatilized from the N-stage circulation loop; through N-level condensation compensation exhaust valve, can also discharge the N medium that is gas in the N-level condenser, can reduce or avoid the N-level condenser to bear great pressure to a certain extent to improve the security performance of N-level condenser. For example, when N is 1, the primary condenser 103 is provided with a primary condensation compensation vent valve 1031; the primary condensation compensation exhaust valve 1031 is used for compensating or exhausting a medium in the primary condenser 103, wherein the medium can be a first medium in the primary condenser 103 or can be other media such as air in the primary condenser 103 for the first time; the first medium of the first-stage condenser 103 can be supplemented through the first-stage condensation compensation exhaust valve 1031 so as to compensate the leaked and volatilized first medium of the first circulation loop; through the first condensation compensation exhaust valve 1031, the first medium or other impurities in the first condenser 103 can be discharged, so that the first condenser 103 can be reduced or avoided from bearing larger pressure to a certain extent, and the safety performance of the first condenser 103 is improved.

Optionally, when N is an integer greater than or equal to 1, the N-stage steam turbine and the N-stage condenser are integrated, or the N-stage expander and the N-stage condenser are integrated, so as to simplify the system structure and reduce the system cost. For example, when N is 1, the first stage turbine and the first stage condenser are integrated, or the first stage expander and the first stage condenser are integrated.

Optionally, when N is an integer greater than or equal to 1, the nth circulation loop is provided with one or more circulation loop discharge valves 502, and the circulation loop discharge valves 502 are used for discharging medium in the nth circulation loop; the medium may be the nth medium in the N-stage condenser, or may be another medium such as air that is first exhausted from the N-stage condenser. Optionally, a recycle loop bleed valve 502 is provided at the output or input of the N-stage condenser; optionally, a recirculation loop bleed valve 502 is provided at the output or input of the N-stage turbine or the N-stage expander. As shown in fig. 3 and 4, a first circulation loop is shown with a circulation loop drain valve 502 disposed between the primary liquid pump 107 and the primary cryogenic fluid reservoir 106.

Optionally, the N-stage turbine or the N-stage expander, the N-stage condenser and the N-stage liquid pump are sleeved with heat insulation layers.

Optionally, the first medium is an inorganic cryogenic medium or an organic cryogenic medium. Optionally, the first medium has a boiling point above or below 0 ℃ (at one atmosphere). Wherein the first medium may be, for example, water, carbon dioxide, ammonia, helium, hydrogen, oxygen, argon, nitrogen, freon, methane, ethane, propane, natural gas, coal gas, biogas, or the like; of course, the first medium may also be other cryogenic mediums. Preferably, the first medium is a combustible gas such as hydrogen, methane, ethane, propane, oxygen, natural gas, coal gas or biogas.

Optionally, when N is an integer greater than or equal to 2, the boiling point of the N-th medium is not higher than the boiling point of the N-1-th medium, so that the N-th medium cools the N-1-th medium in the N-1-stage condenser. Optionally, the nth medium is an inorganic low temperature medium or an organic low temperature medium. Optionally, the nth medium is a cryogenic liquid medium having a boiling point below 0 degrees celsius at normal atmospheric pressure. Optionally, the nth medium has a boiling point below-30 ℃. When N is an integer of 2 or more, the nth medium may be, for example, carbon dioxide, ammonia, helium, hydrogen, oxygen, argon, nitrogen, freon, methane, ethane, propane, natural gas, coal gas, biogas, or the like; of course, the nth medium may be other low temperature mediums. Preferably, the first medium is carbon dioxide or ammonia, the second medium is freon, and the third medium is nitrogen.

Alternatively, the cooling in-line medium may be a combustible medium such as methane, ethane, propane, oxygen, natural gas, coal gas, or biogas, for example. Preferably, the cooling direct-discharging medium is liquid hydrogen or liquid natural gas, the cleanest water vapor is generated by hydrogen combustion, no pollution is generated to the environment, and meanwhile, the heat value generated by hydrogen combustion is also highest, so that the liquid hydrogen is preferentially considered in the fuel system of space and rocket, the price of the liquid hydrogen is obviously reduced along with the expansion of the application market and the reduction of the production cost, and the future development of human beings is likely to be the most environment-friendly liquid hydrogen energy era.

Alternatively, the gaseous preparation medium is an inorganic cryogenic medium or an organic cryogenic medium or a mixed gas. Optionally, the boiling point of the gaseous preparation medium is above or below 0 ℃ (at one atmosphere). Optionally, the gas preparation medium is gas with the boiling point of minus or lower at normal temperature and normal pressure; wherein, the gas preparation medium can be, for example, air, natural gas, methane, ethane, oxygen, nitrogen, argon, hydrogen or helium, etc.; of course, the gaseous preparation medium can also be other media. Preferably, the gas production medium is air or natural gas.

For a clearer understanding of the present embodiment, in an alternative of the present embodiment, the heat energy utilization line 100 includes a circulation loop through which a gas-liquid phase medium flows and a cooling inline line. I.e. the heat energy utilisation circuit 100 comprises a first circulation circuit and a cooling inline. Optionally, the first medium of the first circulation loop is carbon dioxide or ethane; the cooling in-line medium of the cooling in-line pipeline is methane, liquid oxygen and liquid hydrogen.

Specifically, the first circulation loop comprises a gas precooling device 101, a first-stage steam turbine 102 or a first-stage expansion machine, a first-stage condenser 103, a first-stage liquid separator 104, a first-stage condensing pump 105, a first-stage storage inlet valve 1061, a first-stage cryogenic working medium storage 106, a first-stage storage outlet valve 1062 and a first-stage liquid pump 107 which are communicated in sequence from end to end; the primary turbine 102 or primary expander is drivingly connected to a primary generator 108.

The cooling direct-discharge pipeline comprises a cooling direct-discharge low-temperature working medium storage 408, a primary condenser 103 and a cooling direct-discharge output end which are sequentially communicated; the first-stage condenser 103 is used for enabling the cooling direct-discharge medium in the cooling direct-discharge low-temperature working medium storage 408 to cool the first medium output by the first-stage steam turbine 102 or the first-stage expansion machine, and conveying the first medium to the cooling direct-discharge output end for discharge; a cooling in-line liquid pump 409 is provided between the cooling in-line cryogenic fluid reservoir 408 and the primary condenser 103.

The heat energy utilization line 100 may include N circulation circuits through which a gas-liquid phase change medium flows and a cooling inline line.

If N is 2, the second circulation loop includes a first condenser 103, a second turbine 202 or a second expander, a second condenser 203, a second liquid separator 204, a second condensing pump 205, a second storage inlet valve 2061, a second cryogenic working fluid storage 206, a second storage outlet valve 2062 and a second liquid pump 207, which are sequentially communicated from end to end; the secondary turbine 202 or the secondary expander is drivingly connected to a secondary generator 208.

If N is 3, the third circulation loop includes a second condenser 203, a third turbine 302 or a third expander, a third condenser 303, a third liquid separator 304, a third condensing pump 305, a third storage inlet valve 3061, a third cryogenic working fluid storage 306, a third storage outlet valve 3062, and a third liquid pump 307, which are sequentially connected end to end; the three-stage turbine 302 or three-stage expander is drivingly connected to a three-stage generator 308.

Referring to fig. 2, in an alternative to this embodiment, the gas production system includes an indirect heat exchange recycle loop.

The indirect heat exchange circulation loop comprises a gas heat exchange device 850, an indirect compression device 890, an indirect heat exchange device 891 and an indirect throttle valve 892 which are communicated end to end in sequence.

Gas heat exchange apparatus 850 is configured to cool the indirect circulation medium of the indirect heat exchange circulation loop from the gas pre-cooling apparatus 101 to the gas preparation medium flowing from gas line outlet 860;

the indirect heat exchange device 891 is used for cooling the nth medium of the heat energy utilization pipeline 100 to the indirect circulation medium of the indirect heat exchange circulation loop; both ends of the gas pre-cooling device 101 or the N-stage condenser are respectively communicated with both ends of the indirect heat exchange device 891, namely, the gas pre-cooling device 101 or the N-stage condenser is arranged in parallel with the indirect heat exchange device 891. The gas preparation medium flowing from the gas precooling apparatus 101 to the gas line outlet 860 is cooled by the nth medium of the heat energy utilization line 100 through the indirect heat exchange circulation loop by the gas heat exchange apparatus 850 and the indirect heat exchange apparatus 891. As shown in fig. 2-4, the C and D ports of the intermediate heat exchange device 891 are used to connect the two ends of the gas pre-cooling device 101 or the N-stage condenser shown in fig. 3 or 4.

Example two

A second embodiment provides a system for generating electricity using an air separation and production apparatus, the second embodiment including the gas production system described in the first embodiment, and features of the first embodiment disclosed gas production system are also applicable to the second embodiment, and features of the first embodiment disclosed gas production system are not repeated.

The system for generating electricity using the air separation and preparation apparatus provided in this embodiment includes a gas preparation system. The air is made to produce oxygen, nitrogen and other gases through the gas producing system.

The system for generating electricity using the air separation and preparation apparatus described in this embodiment has the advantages of the gas preparation system described in embodiment one, and the advantages of the gas preparation system described in embodiment one are not repeated here.

For a clearer understanding of the present embodiment, the following briefly describes the space division process flow:

referring to fig. 1 of the first embodiment, after air enters the gas filtering device 820 through the gas pipeline inlet 810 and is filtered, the air enters the gas compressing device 830 for compression, the temperature of the compressed air is increased, and then the air is subjected to heat exchange by the gas pre-cooling device 101, and the high-temperature heat energy generated by the gas compressing device 830 is converted into electric energy or mechanical energy for output by using a low-temperature medium, compared with water cooling, the temperature is lower due to the fact that low-temperature liquid mesons are used in the gas pre-cooling device 101, the temperature behind the gas compressing device 830 is reduced, and meanwhile, the energy consumption of the gas compressing device 830 can be reduced.

The cooled compressed air is introduced into a gas purification device 840 to remove and purify the air of moisture, carbon dioxide, acetylene, other hydrocarbons, etc. (e.g., residual nitrogen and oxygen, and trace amounts of argon, etc.). Since the gas purification device 840 needs to be regenerated, two gas purification devices 840 are provided; one of the purification devices is operated and the other purification device is regenerated.

Optionally, the air purified by the gas purifying device 840 is further subjected to cryogenic cooling by the gas heat exchanging device 850, and the formed liquid air (liquid nitrogen and liquid oxygen) enters the gas separating device 870 to be separated into liquid nitrogen and liquid oxygen, thereby forming liquid nitrogen, liquid oxygen and liquid argon products for output.

Alternatively, the gas heat exchange device 850 includes a gas feedback heat exchange device 851 and a gas generating heat exchange device 852; the gas separation device 870 can also fractionate a part of low-temperature nitrogen and low-temperature oxygen, absorb heat through the gas feedback heat exchange device 851, and output pure normal-temperature nitrogen and oxygen for users after reheating.

Optionally, the low-temperature high-pressure nitrogen and oxygen output by the gas separation device 870 can also be released by using devices such as an expander, and the like, so that the mechanical energy is output to form cold energy at the same time, and the gas feedback heat exchange device 851 is convenient for condensing air to form liquid air.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. A gas preparation system, which is characterized by comprising a gas preparation pipeline and a heat energy utilization pipeline;

The gas precooling device is used for enabling a first medium of a first circulation loop of the heat energy utilization pipeline to cool a gas preparation medium of the gas preparation pipeline;

the gas preparation pipeline comprises a gas heat exchange device; the gas heat exchange device is used for cooling a gas preparation medium flowing from the gas pipeline inlet to the gas pipeline outlet;

the gas pipeline inlet, the gas compression device, the gas precooling device and the gas heat exchange device are sequentially communicated; or the gas pipeline inlet, the gas precooling device, the gas compression device and the gas heat exchange device are sequentially communicated;

the outlet of the gas pipeline is communicated with the gas separation device;

the gas power generation heat exchange device is used for enabling the N medium of the heat energy utilization pipeline to cool the gas preparation medium of the gas preparation pipeline; the two ends of the gas precooling device or the N-level condenser are respectively communicated with the two ends of the gas power generation heat exchange device; wherein N is an integer greater than or equal to 1;

2. The gas preparation system of claim 1, wherein the gas preparation line comprises a gas filtration device and a gas purification device;

3. A gas preparation system according to claim 1, wherein a gas expander is arranged between the gas feedback heat exchange device and the gas separation device.

4. The gas production system of claim 1, wherein the thermal energy utilization line comprises a cooling inline line; the cooling straight-line pipeline comprises a gas separation device, the N-level condenser and a cooling straight-line output end which are sequentially communicated; the N-stage condenser is used for enabling the gas preparation medium in the gas separation device to cool the N-stage steam turbine or the N-th medium output by the N-stage expander, and conveying the N-stage medium to the cooling straight-discharge output end for discharging.

5. The gas production system of claim 1, wherein the thermal energy utilization line comprises a cooling inline line; the cooling straight-line pipeline comprises a cooling straight-line low-temperature working medium storage, the N-level condenser and a cooling straight-line output end which are sequentially communicated; the N-stage condenser is used for enabling the cooling direct-discharge medium in the cooling direct-discharge low-temperature working medium storage to cool the N-stage steam turbine or the N-th medium output by the N-stage expansion machine, and conveying the N-th medium to the cooling direct-discharge output end for discharge;

6. The gas production system according to claim 1, wherein when N is an integer of 1 or more, an N-stage low-temperature working medium storage for storing an N-th medium is provided between the N-stage condenser and the N-stage liquid pump;

the gas precooling device is sleeved with an insulating layer;

the gas compression device is sleeved with an insulating layer;

and the gas heat exchange device is sleeved with an insulating layer.

7. A system for generating electricity using an air separation and production plant, comprising a gas production system according to any one of claims 1-6.