KR20150051413A - Cooling method and apparatus for superconductor - Google Patents

Cooling method and apparatus for superconductor Download PDF

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Publication number
KR20150051413A
KR20150051413A KR1020130132825A KR20130132825A KR20150051413A KR 20150051413 A KR20150051413 A KR 20150051413A KR 1020130132825 A KR1020130132825 A KR 1020130132825A KR 20130132825 A KR20130132825 A KR 20130132825A KR 20150051413 A KR20150051413 A KR 20150051413A
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South Korea
Prior art keywords
natural gas
heat exchanger
refrigerant
superconducting
cooling
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KR1020130132825A
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Korean (ko)
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김용훈
유진열
김수철
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대우조선해양 주식회사
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Priority to KR1020130132825A priority Critical patent/KR20150051413A/en
Publication of KR20150051413A publication Critical patent/KR20150051413A/en

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    • 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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • 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
    • 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"
    • F25J1/0045—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 vaporising a liquid 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
    • F25J1/003—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
    • F25J1/0047—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 an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—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 an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant 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
    • F25J1/0203—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 a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
    • F25J1/0204—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 a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
    • 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
    • F25J1/0211—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 a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
    • F25J1/0212—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 a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a single flow MCR cycle
    • 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
    • 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
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0258—Construction and layout of liquefaction equipments, e.g. valves, machines vertical layout of the equipments within in the cold box
    • 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
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • F25J1/0278—Unit being stationary, e.g. on floating barge or fixed platform
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • 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
    • F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The present invention relates to a superconductor cooling system and method using a cooing device for liquefying natural gases as a cooling source for a superconductor. According to the present invention, provided is a superconductor cooling system that includes a cooling device supplying a coolant for natural gases extracted from a gas well; a heat exchanger transmitting the cold heat of the coolant to the natural gases to liquefy the natural gases; and a first superconductor coolant line dispersing the coolant to supply the coolant to the superconductor and the superconductor cooling method. The dispersed coolant cools the superconductor at a critical temperature or less.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a superconducting cooling system,

The present invention relates to a system and method for superconducting cooling using a cooling apparatus for liquefying natural gas produced in a gas well, and more particularly, to a system and method for superconducting a superconducting apparatus using a refrigerant and a liquefied natural gas, To a system and method for cooling the system.

In recent years, consumption of natural gas has been rapidly increasing worldwide. Gas wells where natural gas is produced are usually far from natural gas demand. Thus, natural gas is transported in a gaseous state via land or sea gas piping, or is transported to a remote location where it is stored in an LNG carrier (LNG carrier) in the state of liquefied natural gas (LNG). Liquefied natural gas is obtained by cooling natural gas at cryogenic temperatures (approximately -163 ° C), and its volume is reduced to approximately 1/600 of that of natural gas, making it well suited for long-distance transport through the sea.

In this specification, natural gas means a mixture containing methane as the main component but containing other hydrocarbon components or nitrogen, and also includes any type (gas phase, liquid phase, or mixed phase of gas phase and liquid phase) .

In order to store and transport natural gas in a liquid state, the natural gas must be cooled to about -151 캜 to -163 캜, where the LNG has a pressure of about atmospheric pressure. In the prior art, methods such as a cascade process, a mixed refrigerant process, a refrigerant gas expander process and the like have been used for the cooling of natural gas in a liquefaction facility on the land.

Floating structures such as LNG FPSO (Floating, Production, Storage and Offloading), which can directly produce and store natural gas directly from raw natural gas extracted from gas fired offshore, have been proposed recently, There has been a demand for a liquefaction apparatus for natural gas.

The method of liquefaction of natural gas on land can not be applied to floating structures in the sea as it is, and needs to be improved to suit the marine environment. In the case of LNG FPSO, small- and medium-scale liquefaction facilities are highly feasible, and gas refrigerant expansion processes and mixed refrigerant processes are attracting attention as a liquefaction process suitable for this. However, it is necessary to discuss how to utilize the cryogenic refrigerant produced in the liquefaction process for various purposes, and the introduction of superconductors to improve the efficiency of the equipment needs to be examined.

Prior art 1: Korean patent disclosure 2012-0005158 (2012.01.16)

In order to solve these conventional problems, the present invention provides a method of cooling a superconducting device using a superconducting device as a coolant for cooling a superconducting device to a temperature lower than a critical temperature by branching off cold heat generated in a natural gas liquefaction process, The goal is to reduce costs and improve space efficiency.

Also, it is aimed to effectively operate the power system by using high-efficiency superconducting devices with relatively low power consumption in ships or offshore structures.

According to an aspect of the present invention, there is provided a superconducting cooling system comprising: a cooling device for supplying a coolant for cooling natural gas extracted from a gas well; A heat exchanger for transferring cold heat of the refrigerant to the natural gas to liquefy the natural gas; And a first superconducting refrigerant line that branches the refrigerant of the cooling device and supplies the refrigerant to the superconducting device, wherein the branched refrigerant cools the superconducting device to a critical temperature or less.

According to one embodiment, the heat exchanger of the superconducting cooling system further includes a low temperature heat exchanger for cooling the natural gas extracted from the gas well to a low temperature, and a cryogenic heat exchanger for further cooling the natural gas cooled in the low temperature heat exchanger can do.

According to an embodiment, the refrigerant of the superconducting cooling system precools the natural gas while passing through the low temperature heat exchanger, and the refrigerant passing through the low temperature heat exchanger cools the precooled natural gas via the ultra low temperature heat exchanger, The cooling device can be returned.

According to one embodiment, the branched refrigerant of the superconducting cooling system passes through the superconducting device and cools through heat exchange. The refrigerant passing through the superconducting device precools the natural gas via the low temperature heat exchanger, It can be returned to the cooling device.

According to one embodiment, the liquefied natural gas condensed in the heat exchanger is supplied to the superconducting device through the second superconducting refrigerant line, and the liquefied natural gas supplied to the superconducting device can be returned to the heat exchanger.

According to another aspect of the present invention, a ship or a marine structure having the above-described superconducting cooling system can be provided.

According to another aspect of the present invention, there is provided a superconducting cooling method for cooling a superconducting apparatus by branching a refrigerant for liquefying natural gas, the method comprising the steps of: generating a coolant to be supplied to a heat exchanger for liquefying natural gas in a cooling apparatus; A superconducting cooling method may be provided in which the refrigerant to be supplied is branched and supplied to the superconducting device, the superconducting device is cooled, and the heated refrigerant is supplied to the heat exchanger to pre-cool the natural gas and then return to the cooling device.

As described above, according to the present invention, it is not necessary to provide a cooling device for cooling another superconducting device by using the coolant of the cooling device for liquefying natural gas as the coolant of the coolant circulated for cooling the superconducting device, It is possible to obtain a spatial gain for installing the equipment in the ship and to reduce the maintenance and maintenance cost of the cooling system for maintaining the critical temperature of the superconducting device.

1 is a conceptual diagram of a superconducting cooling system according to the present invention.
2 is a flowchart of a superconducting cooling method according to the present invention.

Hereinafter, a method and apparatus for liquefying natural gas according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

The superconducting cooling system 100 using the refrigerant of the natural gas liquefaction apparatus according to the present invention can be applied to a ship such as an LNG plant or an LNG transport line installed on land or in the sea and a ship such as LNG FPSO (Floating, Production, Storage and Offloading) Structures and the like. LNG FPSO is a floating marine structure that is used to directly liquefy natural gas produced (NG) in the LNG storage tank and to transfer the LNG stored in the LNG storage tank to the LNG transport, if necessary.

As shown in FIG. 1, the superconducting cooling system 100 according to the present invention using the refrigerant of the cooling device 10 installed in a ship or a floating structure to liquefy the natural gas extracted from the gas well, A low-temperature heat exchanger 20 for cooling natural gas (NG) from which impurities such as water, carbon dioxide, and acid gas have been removed through a post-pretreatment process, and a natural gas (NG Temperature heat exchanger 30 for liquefying the natural gas NG and supplying the compressed and condensed refrigerant to the low-temperature heat exchanger 20 and the cryogenic heat exchanger 30 to heat-exchange the natural gas NG, , And a superconducting device (40) cooled by branching the compressed and condensed refrigerant.

According to the present invention, as the refrigerant circulated in the cooling device 10, a mixed refrigerant in which components such as methane, ethanol, propane, butane, and nitrogen are mixed at a predetermined ratio can be used. The mixing ratio of each component can be determined according to the process conditions.

As described above, according to the superconducting cooling system 100 of the present invention, a plurality of heat exchangers, that is, the low temperature heat exchanger 20 and the cryogenic heat exchanger 30 are arranged in series, The size, especially the height, of the heat exchanger can be reduced as compared to a heat exchanger such as a SWHE (Spiral Wound Heat Exchanger) which is often used in the apparatus. Accordingly, it is possible to minimize the influence of the movement of the ship or the marine structure 1 in the marine environment where the rocking occurs, and to improve the liquefaction efficiency, and to minimize the use of the supporting member required for installing the heat exchanger.

First, the liquefaction process of natural gas (NG) can be carried out as follows.

The natural gas, which has been subjected to a pretreatment process such as the removal of impurities after being extracted from the gas well, is supplied to the low-temperature heat exchanger 20 through a natural gas supply line, and is cooled primarily through heat exchange with the refrigerant in the low- do. The natural gas cooled in the low temperature heat exchanger 20 can be cooled to about -50 to 60 캜 and can be partially condensed.

The primarily cooled natural gas is supplied to the cryogenic heat exchanger 30 through the natural gas supply line and is secondarily cooled through heat exchange with the refrigerant in the cryogenic heat exchanger 30. [ The natural gas cooled in the cryogenic heat exchanger 30 can be mostly condensed and the liquid natural gas, that is, liquefied natural gas (LNG), is supplied to the LNG storage tank (not shown) through a pressure reducing valve (not shown) and an LNG receiver Can be transferred and stored. Such natural gas can be compressed and used as a fuel gas for various generators, turbines, and the like.

In addition, the cooling process of the superconducting device 40 can be performed as follows.

The refrigerant supplied to the low temperature heat exchanger 20 for cooling the natural gas NG is branched to the first superconducting refrigerant line 42 and supplied to the superconducting device 40, Lt; / RTI > to below the critical temperature. When the superconducting device 40 is cooled below the critical temperature, the electric resistance completely disappears and the current can flow unlimitedly. The superconducting device 40 includes a low-temperature superconductor (LTS) and a high-temperature superconductor (HTS). The superconducting device 40 may include a metal superconductor, an oxide superconductor, and an organic superconductor according to characteristics of the material. For example, a superconducting motor is comprised of a rotor and a stator, the rotor comprising a field coil that excites a DC power source to produce a magnetic field, and the field coil is comprised of a superconducting material. Since the superconducting material has a resistance lower than a critical temperature, a magnetic field of strong intensity can be generated even if a small current is passed through the field coil. Since a current can flow infinitely, a separate power source device is not required. Can operate.

The refrigerant branched from the cooling device 10 to the first superconducting refrigerant line 42 is passed through the superconducting device 40 to be deprived of cold heat and heated. The heated refrigerant is supplied to the low temperature heat exchanger 20. The heated refrigerant supplied to the low-temperature heat exchanger 20 has sufficient heat to pre-cool the natural gas, so that the natural gas is pre-cooled and returned to the cooling device 10.

According to one embodiment of the present invention, the liquefied natural gas condensed through the cryogenic heat exchanger 30 has sufficient cold to cool the superconducting device 40. Thus, the condensed liquefied natural gas in the cryogenic heat exchanger 30 To supply the liquefied natural gas to the superconducting device 40 via the second superconducting refrigerant line 44 at a supply line for sending the gas to the storage tank. The liquefied natural gas that has passed through the superconducting device 40 is supplied to the low temperature heat exchanger 20 when it is deprived of cold heat and heated, joins with the natural gas (NG) extracted from the gas chill,

2 is a flowchart of a superconducting cooling method according to the present invention. When the natural gas is extracted from the gas well, the liquefaction process of the natural gas starts (S210). (S220). When it is necessary to cool the superconducting device (S230), the coolant is branched and supplied to the superconducting device (S240). Then, the coolant is supplied to the superconducting device The refrigerant passes through the superconducting device and is cooled to a critical temperature or lower, and then supplied to the heat exchanger (S250). The refrigerant supplied to the heat exchanger is returned to the cooling device after precooling the natural gas (S260), and the cooling process is started to cool the natural gas again.

1: Ship or offshore structure 10: Cooling system
20: low temperature heat exchanger 30: cryogenic temperature exchanger
40: superconducting device 42: first superconducting refrigerant line
44: second superconducting refrigerant line 100: superconducting cooling system

Claims (7)

A cooling device for supplying the refrigerant to cool the natural gas extracted from the gas well;
A heat exchanger for transferring the cold heat of the refrigerant to the natural gas and liquefying it;
A first super-conducting refrigerant line for branching the refrigerant of the cooling device and supplying the refrigerant to the superconducting device;
/ RTI >
Wherein the branched refrigerant cools the superconducting device to a critical temperature or lower. The method according to claim 1,
Wherein the heat exchanger further comprises a low temperature heat exchanger for cooling the natural gas extracted from the gas well to a low temperature and an ultra low temperature heat exchanger for further cooling the natural gas cooled in the low temperature heat exchanger. The method of claim 2,
Wherein the refrigerant precools the natural gas while passing through the low temperature heat exchanger and the refrigerant passing through the low temperature heat exchanger is returned to the cooling device after cooling the precooled natural gas via the cryogenic temperature heat exchanger. The method of claim 2,
Wherein the branched refrigerant passes through the superconducting device and cools through heat exchange and the refrigerant passed through the superconducting device is precooled through the low temperature heat exchanger and returned to the cooling device. The method according to claim 1,
Wherein the liquefied natural gas condensed in the heat exchanger is supplied to the superconducting device through a second superconducting refrigerant line, and the liquefied natural gas supplied to the superconducting device is returned to the heat exchanger. A ship or marine structure having a superconducting cooling system according to any one of claims 1 to 5. A superconducting cooling method for cooling a superconducting device by branching a coolant for liquefying natural gas,
A refrigerant to be supplied to the heat exchanger for liquefying natural gas is generated in the cooling device,
The refrigerant to be supplied to the heat exchanger is branched and supplied to the superconducting motor,
A superconducting cooling method in which the superconducting motor is cooled and the heated refrigerant is supplied to the heat exchanger to pre-cool the natural gas and return to the cooling device
KR1020130132825A 2013-11-04 2013-11-04 Cooling method and apparatus for superconductor KR20150051413A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160134347A (en) * 2015-05-15 2016-11-23 대우조선해양 주식회사 The System and Method for Carbon Dioxide Separation from Natural Gas before Gas Liquefaction Process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160134347A (en) * 2015-05-15 2016-11-23 대우조선해양 주식회사 The System and Method for Carbon Dioxide Separation from Natural Gas before Gas Liquefaction Process

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