CN112489877B - Electric power high-temperature superconducting conveying system capable of recycling low-temperature cold energy - Google Patents

Electric power high-temperature superconducting conveying system capable of recycling low-temperature cold energy Download PDF

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Publication number
CN112489877B
CN112489877B CN202011332573.6A CN202011332573A CN112489877B CN 112489877 B CN112489877 B CN 112489877B CN 202011332573 A CN202011332573 A CN 202011332573A CN 112489877 B CN112489877 B CN 112489877B
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natural gas
nitrogen
heat exchanger
temperature heat
inlet
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CN112489877A (en
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谭宏博
温娜
祝乘风
丁智
厉彦忠
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Xian Jiaotong University
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Xian Jiaotong University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/16—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/0015—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
    • F25J1/0037—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work of a return stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0221—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using the cold stored in an external cryogenic component in an open refrigeration loop
    • F25J1/0223—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using the cold stored in an external cryogenic component in an open refrigeration loop in combination with the subsequent re-vaporisation of the originally liquefied gas at a second location to produce the external cryogenic component
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0221—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using the cold stored in an external cryogenic component in an open refrigeration loop
    • F25J1/0224—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using the cold stored in an external cryogenic component in an open refrigeration loop in combination with an internal quasi-closed refrigeration loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0235—Heat exchange integration
    • F25J1/0236—Heat exchange integration providing refrigeration for different processes treating not the same feed stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/42—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/62—Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30—Compression of the feed stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/42—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/60—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being (a mixture of) hydrocarbons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/30—Dynamic liquid or hydraulic expansion with extraction of work, e.g. single phase or two-phase turbine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/14—External refrigeration with work-producing gas expansion loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/60—Details about pipelines, i.e. network, for feed or product distribution

Abstract

A power high-temperature superconducting transmission system with low-temperature cold energy recycling comprises a high-temperature superconducting power and liquefied natural gas combined transmission pipeline, a nitrogen liquefaction system and a natural gas liquefaction system, wherein the nitrogen liquefaction system and the natural gas liquefaction system are connected with the high-temperature superconducting power and liquefied natural gas combined transmission pipeline; the liquefied natural gas is used as an external cold shield of the high-temperature superconducting power transmission system, and meanwhile, the high-temperature superconducting power transmission and the remote transmission of the liquefied natural gas are realized; the liquefied natural gas conveying direction is opposite to the flow direction of the liquid nitrogen; the invention realizes the recycling of cold energy of low-temperature liquid, obviously reduces the comprehensive energy consumption of high-temperature superconducting power transmission and natural gas remote transmission, and improves the energy transmission efficiency of the power and liquefied natural gas combined transmission system.

Description

Electric power high-temperature superconducting conveying system capable of recycling low-temperature cold energy
Technical Field
The invention belongs to the technical field of energy conservation of an energy interconnection network system, and particularly relates to a low-temperature cold energy recycling electric power high-temperature superconducting conveying system.
Background
The cross-region transmission of energy is inevitable, and the loss is very large. The energy interconnection network is a comprehensive system formed by production, transmission and consumption of renewable energy, electric power, natural gas and traditional energy, relates to interconnection allocation and interconversion of various energy sources, and has great significance in interconnection allocation energy-saving technical innovation of various energy sources in the foreseeable future.
At present, the loss rate of the traditional extra-high voltage transmission is about 6-7%, and the loss rate can be reduced to about 4% by adopting a high-temperature superconducting direct-current transmission technology. The high-temperature superconducting cable generally works in a liquid nitrogen temperature region, and usually needs to prepare a large amount of liquid nitrogen to cool the cable, so that the cable works below a superconducting transition temperature, and therefore, although the power loss is low, a low-temperature refrigeration system for preparing and maintaining the cold energy in the liquid nitrogen temperature region has remarkable energy consumption. The inventor proposes that a liquefied natural gas pipeline can be combined with high-temperature superconducting power transmission, a set of low-temperature refrigeration system is used for providing cold for a liquefied natural gas transmission system, and the liquefied natural gas creates a low-temperature environment for a high-temperature superconducting cable. The liquefaction of the natural gas needs to consume a large amount of compression work, if the liquefied natural gas is conveyed to a receiving end, low-temperature cold energy released in the process of gasification rewarming (or direct utilization or injection into a pipe network) is efficiently recovered, the energy loss of a liquefied natural gas and high-temperature superconducting power combined conveying system can be remarkably reduced, but no literature for recycling the low-temperature energy is disclosed at present.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a power high-temperature superconducting transmission system capable of recycling low-temperature cold energy, so that the recycling of low-temperature liquid cold energy is realized, the comprehensive energy consumption of high-temperature superconducting power transmission and natural gas remote transmission is obviously reduced, and the energy transmission efficiency of a power and liquefied natural gas combined transmission system is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-temperature cold energy recycling electric power high-temperature superconducting conveying system comprises a pressurized liquid nitrogen storage tank 2, wherein a liquid injection port a of the pressurized liquid nitrogen storage tank 2 is connected with a liquid nitrogen injection pipeline LIN through a liquid nitrogen transfer pump 3, a liquid inlet d of the pressurized liquid nitrogen storage tank 2 is connected with a liquid nitrogen outlet c of a nitrogen liquefying system 1, a nitrogen inlet b of the nitrogen liquefying system 1 is connected with a nitrogen inlet pipeline, a liquid outlet of the pressurized liquid nitrogen storage tank 2 is connected with an inlet of a liquid nitrogen booster pump 4, an outlet of the liquid nitrogen booster pump 4 is connected with a liquid nitrogen inlet of a high-temperature superconducting electric power and liquefied natural gas combined conveying pipeline 7, a liquid nitrogen outlet of the high-temperature superconducting electric power and liquefied natural gas combined conveying pipeline 7 is connected with a liquid nitrogen inlet i of a natural gas liquefying system 11, and a nitrogen outlet j of the natural gas liquefying system 11 is connected with an emptying system through a pipeline;
a natural gas inlet g of a natural gas liquefaction system 11 is connected with a natural gas inlet pipeline, a liquefied natural gas outlet h of the natural gas liquefaction system 11 is connected with a liquid inlet of a liquefied natural gas storage tank 10, a liquid outlet of the liquefied natural gas storage tank 10 is connected with an inlet of a liquefied natural gas booster pump 9, an outlet of the liquefied natural gas booster pump 9 is connected with a liquefied natural gas inlet of a high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7, a liquefied natural gas outlet of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7 is connected with an inlet of a liquefied natural gas liquid expander 5, an outlet of the liquefied natural gas liquid expander 5 is connected with a liquefied natural gas inlet e of a nitrogen liquefaction system 1, and a natural gas outlet f of the nitrogen liquefaction system 1 is connected with a natural gas receiving pipe network through a pipeline;
one end of a cable of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7 is connected with a first terminal 6 of the high-temperature superconducting cable, and the other end of the cable is connected with a second terminal 8 of the high-temperature superconducting cable;
in the high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7, liquid nitrogen is used for providing a low-temperature environment and insulation protection for the high-temperature superconducting cable, so that a high-temperature superconducting power conveying system is formed; the liquefied natural gas is used as an external cold shield of the high-temperature superconducting power transmission system, and meanwhile, the high-temperature superconducting power transmission and the remote transmission of the liquefied natural gas are realized; the lng is transported in the opposite direction to the flow of liquid nitrogen.
The nitrogen liquefaction system 1 comprises a nitrogen compressor C1, a high-temperature heat exchanger HX1 for nitrogen, a medium-temperature heat exchanger HX2 for nitrogen, a low-temperature heat exchanger HX3 for nitrogen and a medium-pressure nitrogen expander E1; an air inlet of a nitrogen compressor C1 is connected with a nitrogen inlet b through a pipeline, an exhaust port of the nitrogen compressor C1 is sequentially connected with the high-pressure nitrogen channel side of a high-temperature heat exchanger HX1 for nitrogen, a medium-temperature heat exchanger HX2 for nitrogen and a low-temperature heat exchanger HX3 for nitrogen through pipelines, and a liquid nitrogen outlet C at the high-pressure side of a low-temperature heat exchanger HX3 for nitrogen is connected with a liquid inlet d of the pressurized liquid nitrogen storage tank 2; at a high-pressure side nitrogen pipeline between the high-temperature heat exchanger HX1 for nitrogen and the medium-temperature heat exchanger HX2 for nitrogen, a bypass outlet is connected with an inlet of a medium-pressure nitrogen expansion machine E1, an outlet of the medium-pressure nitrogen expansion machine E1 is sequentially connected with a low-pressure nitrogen side of the medium-temperature heat exchanger HX2 for nitrogen and the high-temperature heat exchanger HX1 for nitrogen, and a low-pressure nitrogen side outlet of the high-temperature heat exchanger HX1 for nitrogen is connected with an inlet bypass inlet of a nitrogen compressor C1; the outlet of the liquefied natural gas liquid expander 5 is connected with the liquefied natural gas inlet e of the low-temperature heat exchanger HX3 for nitrogen, and then sequentially connected with the natural gas side channels of the medium-temperature heat exchanger HX2 for nitrogen and the high-temperature heat exchanger HX1 for nitrogen, and the natural gas outlet f of the high-temperature heat exchanger HX1 for nitrogen is connected with a natural gas receiving pipe network.
The natural gas liquefaction system 11 comprises a natural gas compressor C2, a high-pressure nitrogen expansion machine E2, a high-temperature heat exchanger HX4 for natural gas, a medium-temperature heat exchanger HX5 for natural gas and a low-temperature heat exchanger HX6 for natural gas; the natural gas compressor C2 air inlet is connected with a natural gas inlet g through a pipeline, the natural gas compressor C2 air outlet is sequentially connected with natural gas side channels of a high-temperature heat exchanger HX4 for natural gas, a medium-temperature heat exchanger HX5 for natural gas and a low-temperature heat exchanger HX6 for natural gas through pipelines, and a liquefied natural gas outlet h of the low-temperature heat exchanger HX6 for natural gas is connected with a liquid inlet of the liquefied natural gas storage tank 10 through a pipeline; the liquid nitrogen outlet of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7 is connected with a liquid nitrogen inlet i of a low-temperature heat exchanger HX6 for natural gas through a pipeline, a high-pressure liquid nitrogen outlet of a low-temperature heat exchanger HX6 for natural gas is connected with a high-pressure nitrogen inlet of a medium-temperature heat exchanger HX5 for natural gas, a high-pressure nitrogen outlet of a medium-temperature heat exchanger HX5 for natural gas is connected with an inlet of a high-pressure nitrogen expander E2, an outlet of the high-pressure nitrogen expander E2 is connected with a low-pressure nitrogen inlet of a medium-temperature heat exchanger HX5 for natural gas, a low-pressure nitrogen outlet of a medium-temperature heat exchanger HX5 for natural gas is connected with a low-pressure nitrogen inlet of a high-temperature heat exchanger HX4 for natural gas, and a nitrogen outlet j of a high-temperature heat exchanger HX4 for natural gas is connected with an evacuation system through a pipeline.
The invention has the beneficial effects that:
1. the high-temperature superconducting power and liquefied natural gas combined conveying pipeline can realize the combined remote conveying of the liquefied natural gas and the high-temperature superconducting power, and low-temperature cold energy released in the gasification process after liquid nitrogen is conveyed to a terminal is used for liquefying the natural gas; the liquefied natural gas is conveyed to a receiving terminal and then is gasified and then is sent to a natural gas pipe network, the released low-temperature cold energy is used for liquefying nitrogen, and the low-temperature liquid cold energy is fully recycled, so that the energy consumption of a low-temperature system of a high-temperature superconducting power transmission system is obviously reduced, and the energy-saving significance is achieved.
2. The power high-temperature superconducting transmission system with the low-temperature cold energy recycling function provided by the invention has independent liquefied natural gas and power high-temperature superconducting transmission functions, and the cooling and insulation of the high-temperature superconducting cable are provided by liquid nitrogen, so that the high-temperature superconducting transmission of power can be still ensured after the liquefied natural gas is stopped being transmitted; after the electric power transmission is interrupted, the liquefied natural gas can also be independently transmitted, so that the energy transmission mode is more flexible, and the independent transmission of the electric power and the liquefied natural gas can be realized.
3. The liquefied natural gas and the liquid nitrogen in the temperature-enhanced superconducting power and liquefied natural gas combined conveying pipeline can be mutually cold sources, and only one cryogenic liquid needs to be cooled to be subcooled and cold energy is provided for subcooling the other cryogenic liquid during remote conveying.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic configuration diagram of the nitrogen liquefaction system 1 and the natural gas liquefaction system 11.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
referring to fig. 1, the electric power high-temperature superconducting conveying system with low-temperature cold energy recycling comprises a pressurized liquid nitrogen storage tank 2, wherein a liquid injection port a of the pressurized liquid nitrogen storage tank 2 is connected with a liquid nitrogen injection pipeline LIN through a liquid nitrogen transfer pump 3, a liquid inlet d of the pressurized liquid nitrogen storage tank 2 is connected with a liquid nitrogen outlet c of a nitrogen liquefying system 1, a nitrogen inlet b of the nitrogen liquefying system 1 is connected with a nitrogen inlet pipeline, a liquid outlet of the pressurized liquid nitrogen storage tank 2 is connected with an inlet of a liquid nitrogen booster pump 4, an outlet of the liquid nitrogen booster pump 4 is connected with a liquid nitrogen inlet of a high-temperature superconducting electric power and liquefied natural gas combined conveying pipeline 7, a liquid nitrogen outlet of the high-temperature superconducting electric power and liquefied natural gas combined conveying pipeline 7 is connected with a liquid nitrogen inlet i of a natural gas liquefying system 11, and a nitrogen outlet j of the natural gas liquefying system 11 is connected with an emptying system through a pipeline;
a natural gas inlet g of a natural gas liquefaction system 11 is connected with a natural gas inlet pipeline, a liquefied natural gas outlet h of the natural gas liquefaction system 11 is connected with a liquid inlet of a liquefied natural gas storage tank 10, a liquid outlet of the liquefied natural gas storage tank 10 is connected with an inlet of a liquefied natural gas booster pump 9, an outlet of the liquefied natural gas booster pump 9 is connected with a liquefied natural gas inlet of a high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7, a liquefied natural gas outlet of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7 is connected with an inlet of a liquefied natural gas liquid expander 5, an outlet of the liquefied natural gas liquid expander 5 is connected with a liquefied natural gas inlet e of a nitrogen liquefaction system 1, and a natural gas outlet f of the nitrogen liquefaction system 1 is connected with a natural gas receiving pipe network through a pipeline;
one end of a cable of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7 is connected with a first terminal 6 of the high-temperature superconducting cable, and the other end of the cable is connected with a second terminal 8 of the high-temperature superconducting cable;
in the high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7, liquid nitrogen is used for providing a low-temperature environment and insulation protection for the high-temperature superconducting cable, so that a high-temperature superconducting power conveying system is formed; the liquefied natural gas is used as an external cold shield of the high-temperature superconducting power transmission system, and meanwhile, the high-temperature superconducting power transmission and the remote transmission of the liquefied natural gas are realized; the lng is transported in the opposite direction to the flow of liquid nitrogen.
As shown in fig. 2, the nitrogen liquefaction system 1 includes a nitrogen compressor C1, a high temperature heat exchanger HX1 for nitrogen, a medium temperature heat exchanger HX2 for nitrogen, a low temperature heat exchanger HX3 for nitrogen, and a medium pressure nitrogen expander E1; an air inlet of a nitrogen compressor C1 is connected with a nitrogen inlet b through a pipeline, an exhaust port of the nitrogen compressor C1 is sequentially connected with the high-pressure nitrogen channel side of a high-temperature heat exchanger HX1 for nitrogen, a medium-temperature heat exchanger HX2 for nitrogen and a low-temperature heat exchanger HX3 for nitrogen through pipelines, and a liquid nitrogen outlet C at the high-pressure side of a low-temperature heat exchanger HX3 for nitrogen is connected with a liquid inlet d of the pressurized liquid nitrogen storage tank 2; at a high-pressure side nitrogen pipeline between the high-temperature heat exchanger HX1 for nitrogen and the medium-temperature heat exchanger HX2 for nitrogen, a bypass outlet is connected with an inlet of a medium-pressure nitrogen expansion machine E1, an outlet of the medium-pressure nitrogen expansion machine E1 is sequentially connected with a low-pressure nitrogen side of the medium-temperature heat exchanger HX2 for nitrogen and the high-temperature heat exchanger HX1 for nitrogen, and a low-pressure nitrogen side outlet of the high-temperature heat exchanger HX1 for nitrogen is connected with an inlet bypass inlet of a nitrogen compressor C1; the outlet of the liquefied natural gas liquid expander 5 is connected with the liquefied natural gas inlet e of the low-temperature heat exchanger HX3 for nitrogen, and then sequentially connected with the natural gas side channels of the medium-temperature heat exchanger HX2 for nitrogen and the high-temperature heat exchanger HX1 for nitrogen, and the natural gas outlet f of the high-temperature heat exchanger HX1 for nitrogen is connected with a natural gas receiving pipe network.
Referring to fig. 2, the natural gas liquefaction system 11 includes a natural gas compressor C2, a high-pressure nitrogen expander E2, a high-temperature heat exchanger HX4 for natural gas, an intermediate-temperature heat exchanger HX5 for natural gas, and a low-temperature heat exchanger HX6 for natural gas; the natural gas compressor C2 air inlet is connected with a natural gas inlet g through a pipeline, the natural gas compressor C2 air outlet is sequentially connected with natural gas side channels of a high-temperature heat exchanger HX4 for natural gas, a medium-temperature heat exchanger HX5 for natural gas and a low-temperature heat exchanger HX6 for natural gas through pipelines, and a liquefied natural gas outlet h of the low-temperature heat exchanger HX6 for natural gas is connected with a liquid inlet of the liquefied natural gas storage tank 10 through a pipeline; the liquid nitrogen outlet of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7 is connected with a liquid nitrogen inlet i of a low-temperature heat exchanger HX6 for natural gas through a pipeline, a high-pressure liquid nitrogen outlet of a low-temperature heat exchanger HX6 for natural gas is connected with a high-pressure nitrogen inlet of a medium-temperature heat exchanger HX5 for natural gas, a high-pressure nitrogen outlet of a medium-temperature heat exchanger HX5 for natural gas is connected with an inlet of a high-pressure nitrogen expander E2, an outlet of the high-pressure nitrogen expander E2 is connected with a low-pressure nitrogen inlet of a medium-temperature heat exchanger HX5 for natural gas, a low-pressure nitrogen outlet of a medium-temperature heat exchanger HX5 for natural gas is connected with a low-pressure nitrogen inlet of a high-temperature heat exchanger HX4 for natural gas, and a nitrogen outlet j of a high-temperature heat exchanger HX4 for natural gas is connected with an evacuation system through a pipeline.
The working principle of the invention is as follows:
when the system operates, firstly, liquid nitrogen is injected into a pressurized liquid nitrogen storage tank 2 through a liquid nitrogen transfer pump 3, then the liquid nitrogen is pressurized by a liquid nitrogen booster pump 4 and then is sent into a liquid nitrogen channel of a high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7, under the cooling and insulation protection of the liquid nitrogen, a high-temperature superconducting cable reaches a superconducting state, and power can be subjected to superconducting conveying between a first terminal 6 of the high-temperature superconducting cable and a second terminal 8 of the high-temperature superconducting cable; after the liquid nitrogen flows out of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7, the liquid nitrogen is depressurized and gasified, and the natural gas is liquefied; specifically, high-pressure liquid nitrogen absorbs heat of a low-temperature area of the pressurized natural gas in a low-temperature heat exchanger HX6 for the natural gas to be heated and gasified, then further absorbs heat of a medium-temperature area of the pressurized natural gas in a medium-temperature heat exchanger HX5 for the natural gas to generate medium-temperature high-pressure nitrogen, and then the nitrogen is sent into a high-pressure nitrogen expansion machine E2 to be expanded, depressurized and cooled, and the generated refrigerating capacity is sent back to the medium-temperature heat exchanger HX5 for the natural gas to be used for cooling the pressurized natural gas; and finally, the reheated medium-temperature low-pressure nitrogen enters a high-temperature heat exchanger HX4 for natural gas to be further heated to the ambient temperature, and then is sent to a nitrogen discharge system.
In the system, the cold energy of the liquid nitrogen can be fully utilized to liquefy and supercool the natural gas. The natural gas after being purified and pretreated is compressed by a natural gas compressor C2, and then is cooled, liquefied and supercooled by the liquid nitrogen which flows back in a high temperature heat exchanger HX4 for the natural gas, a medium temperature heat exchanger HX5 for the natural gas and a low temperature heat exchanger HX6 for the natural gas in sequence, and then is sent into a liquefied natural gas storage tank 10, after being pressurized by a liquefied natural gas booster pump 9, the liquefied natural gas is injected into a liquefied natural gas channel of a high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7 to provide a cold screen for a liquid nitrogen and high-temperature superconducting system, the liquefied natural gas flows out of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline 7, then the liquefied natural gas enters a liquefied natural gas liquid expansion machine 5 to be depressurized and cooled, then the liquefied natural gas is sent into a low-temperature heat exchanger HX3 for nitrogen, a medium-temperature heat exchanger HX2 for nitrogen and a high-temperature heat exchanger HX1 for nitrogen of the nitrogen liquefying system, and the liquefied natural gas is reheated from a supercooled state to a saturated state, then is gasified and reheated to an ambient temperature and then is sent into a natural gas pipe network; the nitrogen compressed by the nitrogen compressor C1 enters a high-temperature heat exchanger HX1 for nitrogen, is cooled by the returned low-pressure nitrogen and low-temperature natural gas, and then is divided into two parts, one part is expanded, depressurized and cooled in a medium-pressure nitrogen expansion machine E1, then the low-temperature and low-pressure nitrogen is sent to a low-pressure nitrogen channel of the medium-temperature heat exchanger HX2 for nitrogen, and is used for cooling the other part of the medium-pressure nitrogen, and finally the low-pressure and low-temperature nitrogen is sent to the inlet of the nitrogen compressor C1 for circulation; the nitrogen is divided into another stream by the medium-pressure nitrogen cooled in the high-temperature heat exchanger HX1, is gradually cooled and liquefied in the medium-temperature heat exchanger HX2 for the nitrogen and the low-temperature heat exchanger HX3 for the nitrogen in sequence, and then is sent into the liquid nitrogen storage tank 2 with pressure for storage, and enters the recycling process again.
When the electric high-temperature superconducting conveying system with the low-temperature cold energy recycled normally operates, a channel entering a pressurized liquid nitrogen storage tank 2 through a liquid nitrogen transfer pump 3 is closed, low-temperature cold energy is recycled in liquid nitrogen and liquefied natural gas, and the system only needs to consume certain power in the liquefaction systems at two ends to supplement the loss of the low-temperature cold energy.
This example is a further detailed description of the present invention, and it is not deemed that the specific embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that several simple deductions or substitutions can be made without departing from the concept of the present invention, for example, at the natural gas liquefaction end, other forms of using the liquid nitrogen depressurization, the heat absorption capacity of the gasification process to liquefy the natural gas; or other nitrogen liquefaction methods using lng cold in a nitrogen liquefaction system, should be considered as falling within the scope of the present invention as defined by the appended claims.

Claims (1)

1. The utility model provides a low temperature cold energy cyclic utilization's electric power high temperature superconducting conveying system, presses liquid nitrogen storage tank (2) including the area, its characterized in that: the liquid injection port a of the pressurized liquid nitrogen storage tank (2) is connected with a liquid nitrogen injection pipeline LIN through a liquid nitrogen transfer pump (3), the liquid inlet d of the pressurized liquid nitrogen storage tank (2) is connected with the liquid nitrogen outlet c of the nitrogen liquefaction system (1), the nitrogen inlet b of the nitrogen liquefaction system (1) is connected with a nitrogen gas inlet pipeline, the liquid outlet of the pressurized liquid nitrogen storage tank (2) is connected with the inlet of a liquid nitrogen booster pump (4), the outlet of the liquid nitrogen booster pump (4) is connected with the liquid nitrogen inlet of a high-temperature superconducting power and liquefied natural gas combined conveying pipeline (7), the liquid nitrogen outlet of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline (7) is connected with the liquid nitrogen inlet i of a natural gas liquefaction system (11), and the nitrogen outlet j of the liquefied natural gas system (11) is connected with an evacuation system through a pipeline;
a natural gas inlet g of a natural gas liquefaction system (11) is connected with a natural gas inlet pipeline, a liquefied natural gas outlet h of the natural gas liquefaction system (11) is connected with a liquid inlet of a liquefied natural gas storage tank (10), a liquid outlet of the liquefied natural gas storage tank (10) is connected with an inlet of a liquefied natural gas booster pump (9), an outlet of the liquefied natural gas booster pump (9) is connected with a liquefied natural gas inlet of a high-temperature superconducting power and liquefied natural gas combined conveying pipeline (7), a liquefied natural gas outlet of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline (7) is connected with an inlet of a liquefied natural gas liquid expander (5), an outlet of the liquefied natural gas liquid expander (5) is connected with a liquefied natural gas inlet e of a nitrogen liquefaction system (1), and a natural gas outlet f of the nitrogen liquefaction system (1) is connected with a natural gas receiving pipe network through a pipeline;
one end of a cable of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline (7) is connected with a first terminal (6) of the high-temperature superconducting cable, and the other end of the cable is connected with a second terminal (8) of the high-temperature superconducting cable;
in a high-temperature superconducting power and liquefied natural gas combined conveying pipeline (7), liquid nitrogen is used for providing a low-temperature environment and insulation protection for a high-temperature superconducting cable, so that a high-temperature superconducting power conveying system is formed; the liquefied natural gas is used as an external cold shield of the high-temperature superconducting power transmission system, and meanwhile, the high-temperature superconducting power transmission and the remote transmission of the liquefied natural gas are realized; the liquefied natural gas conveying direction is opposite to the flow direction of the liquid nitrogen;
the nitrogen liquefaction system (1) comprises a nitrogen compressor (C1), a high-temperature heat exchanger (HX1) for nitrogen, a medium-temperature heat exchanger (HX2) for nitrogen, a low-temperature heat exchanger (HX3) for nitrogen and a medium-pressure nitrogen expander (E1); an air inlet of a nitrogen compressor (C1) is connected with a nitrogen inlet b through a pipeline, an exhaust port of the nitrogen compressor (C1) is sequentially connected with the high-pressure nitrogen channel side of a high-temperature heat exchanger (HX1) for nitrogen, a medium-temperature heat exchanger (HX2) for nitrogen and a low-temperature heat exchanger (HX3) for nitrogen through pipelines, and a high-pressure side liquid nitrogen outlet C of the low-temperature heat exchanger (HX3) for nitrogen is connected with a liquid inlet d of a pressurized liquid nitrogen storage tank (2); at a high-pressure side nitrogen pipeline between the high-temperature heat exchanger (HX1) for nitrogen and the medium-temperature heat exchanger (HX2) for nitrogen, a bypass outlet is connected with an inlet of a medium-pressure nitrogen expansion machine (E1), an outlet of the medium-pressure nitrogen expansion machine (E1) is sequentially connected with a low-pressure nitrogen side of the medium-temperature heat exchanger (HX2) for nitrogen and the high-temperature heat exchanger (HX1) for nitrogen, and a low-pressure nitrogen side outlet of the high-temperature heat exchanger (HX1) for nitrogen is connected with an inlet bypass inlet of a nitrogen compressor (C1); an outlet of the liquefied natural gas liquid expander (5) is connected with a liquefied natural gas inlet e of the low-temperature heat exchanger (HX3) for nitrogen, and then is sequentially connected with natural gas side channels of the medium-temperature heat exchanger (HX2) for nitrogen and the high-temperature heat exchanger (HX1) for nitrogen, and a natural gas outlet f of the high-temperature heat exchanger (HX1) for nitrogen is connected with a natural gas receiving pipe network;
the natural gas liquefaction system (11) comprises a natural gas compressor (C2), a high-pressure nitrogen expansion machine (E2), a high-temperature heat exchanger (HX4) for natural gas, a medium-temperature heat exchanger (HX5) for natural gas and a low-temperature heat exchanger (HX6) for natural gas; the natural gas compressor (C2) is characterized in that an air inlet of the natural gas compressor (C2) is connected with a natural gas inlet g through a pipeline, an exhaust port of the natural gas compressor (C2) is connected with a natural gas side channel of a high-temperature heat exchanger (HX4) for natural gas, a medium-temperature heat exchanger (HX5) for natural gas and a low-temperature heat exchanger (HX6) for natural gas in sequence through pipelines, and a liquefied natural gas outlet h of the low-temperature heat exchanger (HX6) for natural gas is connected with a liquid inlet of the liquefied natural gas storage tank (10) through a pipeline; the liquid nitrogen outlet of the high-temperature superconducting power and liquefied natural gas combined conveying pipeline (7) is connected with a liquid nitrogen inlet i of a low-temperature heat exchanger (HX6) for natural gas through a pipeline, a high-pressure liquid nitrogen outlet of the low-temperature heat exchanger (HX6) for natural gas is connected with a high-pressure nitrogen inlet of a medium-temperature heat exchanger (HX5) for natural gas, a high-pressure nitrogen outlet of the medium-temperature heat exchanger (HX5) for natural gas is connected with an inlet of a high-pressure nitrogen expander (E2), an outlet of the high-pressure nitrogen expander (E2) is connected with a low-pressure nitrogen inlet of a medium-temperature heat exchanger (HX5) for natural gas, a low-pressure nitrogen outlet of the medium-temperature heat exchanger (HX5) for natural gas is connected with a low-pressure nitrogen inlet of a high-temperature heat exchanger (HX4) for natural gas, and a nitrogen outlet j of the high-temperature heat exchanger (HX4) for natural gas is connected with an evacuation system through a pipeline.
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CN207439003U (en) * 2017-09-19 2018-06-01 四川空分设备(集团)有限责任公司 A kind of cryogenic cold energy retracting device and air supply system
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