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KR20200112058A - Power generating system using LNG gas - Google Patents

Power generating system using LNG gas Download PDF

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Publication number
KR20200112058A
KR20200112058A KR1020190031932A KR20190031932A KR20200112058A KR 20200112058 A KR20200112058 A KR 20200112058A KR 1020190031932 A KR1020190031932 A KR 1020190031932A KR 20190031932 A KR20190031932 A KR 20190031932A KR 20200112058 A KR20200112058 A KR 20200112058A
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South Korea
Prior art keywords
heat
heat exchanger
vaporizer
liquefied gas
gas
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KR1020190031932A
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Korean (ko)
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KR102403854B1 (en
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문성재
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삼성중공업 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J3/00—Driving of auxiliaries
    • B63J3/04—Driving of auxiliaries from power plant other than propulsion power plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K15/00—Adaptations of plants for special use
    • F01K15/02—Adaptations of plants for special use for driving vehicles, e.g. locomotives
    • F01K15/04—Adaptations of plants for special use for driving vehicles, e.g. locomotives the vehicles being waterborne vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
    • F01K9/003—Plants characterised by condensers arranged or modified to co-operate with the engines condenser cooling circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B2035/4433—Floating structures carrying electric power plants
    • B63B2035/444—Floating structures carrying electric power plants for converting combustion energy into electric energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

A liquefied gas power generation system is disclosed. The liquefied gas power generation system according to an aspect of the present invention includes: a gas turbine that is operated using gas formed by vaporizing liquefied gas and is connected to a first generator; a heating medium circulation line that absorbs cold heat of the liquefied gas in a vaporizer that vaporizes the liquefied gas by circulating a heating medium; a first heat exchanger that cools the air supplied to the gas turbine by using the heat medium that has absorbed cold heat from the vaporizer; and a second heat exchanger that absorbs waste heat from the gas turbine using a heat medium supplied to the vaporizer.

Description

액화가스 발전 시스템{Power generating system using LNG gas}Liquefied gas power generation system {Power generating system using LNG gas}

본 발명은 액화가스 발전 시스템에 관한 것이다.The present invention relates to a liquefied gas power generation system.

선박을 포함하는 해상구조물에는 육상에 필요한 전력 또는 해상구조물 운영을 위하여 필요한 전력의 생산하기 위한 다양한 발전장치가 구비된다.Offshore structures including ships are equipped with various power generation devices for producing electric power required for land or electric power necessary for the operation of the offshore structure.

이러한 해상구조물에는 다양한 형태의 발전설비를 구비할 수 있으나, 최근에 액화천연가스를 주연료로 하는 가스 터빈발전을 이용한 가스 터빈 발전장치가 많이 사용되고 있다.Such offshore structures may be provided with various types of power generation facilities, but recently, gas turbine power generation devices using gas turbine power generation using liquefied natural gas as a main fuel have been widely used.

그런데, 액화천연가스의 재기화 과정에서 발생되는 냉열이 효율적으로 활용되지 않는 문제점이 있다. 또한, 발전설비에서 발생하는 다양한 폐열도 활용되지 않는 문제점도 있다.However, there is a problem that the cold heat generated during the regasification process of liquefied natural gas is not efficiently utilized. In addition, there is a problem that various waste heat generated from the power generation facility is not utilized.

한국공개특허 제2018-0076922호Korean Patent Publication No. 2018-0076922

본 발명의 실시예는, 액화천연가스의 재기화 과정에서 발생되는 냉열 및 발전설비에서 발생하는 다양한 폐열을 효과적으로 활용할 수 있는 액화가스 발전 시스템을 제공하기 위한 것이다.An embodiment of the present invention is to provide a liquefied gas power generation system that can effectively utilize cold heat generated during the regasification process of liquefied natural gas and various waste heat generated from a power generation facility.

본 발명의 일 측면에 따르면, 액화가스를 기화한 가스로 작동되고 제1 발전기에 연결된 가스 터빈, 열매체를 순환시켜 액화가스를 기화시키는 기화기에서 액화가스의 냉열을 흡수하는 열매체 순환라인, 상기 기화기에서 냉열을 흡수한 상기 열매체를 이용하여 상기 가스 터빈에 공급되는 공기를 냉각하는 제1 열교환기 및 상기 기화기로 공급되는 상기 열매체로 상기 가스 터빈의 폐열을 흡수하는 제2 열교환기를 포함하는 액화가스 발전 시스템이 제공된다.According to an aspect of the present invention, a gas turbine operated with a gas vaporized liquefied gas and connected to the first generator, a heating medium circulation line absorbing cold heat of the liquefied gas in the vaporizer for vaporizing the liquefied gas by circulating the heating medium, Liquefied gas power generation system including a first heat exchanger for cooling air supplied to the gas turbine using the heat medium absorbing cold heat, and a second heat exchanger for absorbing waste heat from the gas turbine with the heat medium supplied to the vaporizer Is provided.

이 때, 상기 가스 터빈의 폐열로 수증기를 생성하는 스팀 보일러, 상기 수증기로 작동되고 제2 발전기로 연결된 스팀 터빈 및 상기 기화기에서 냉열을 흡수한 상기 열매체로 상기 스팀 터빈에서 배출된 수증기를 응축 시키는 제3 열교환기를 더 포함할 수 있다.At this time, a steam boiler that generates steam from waste heat of the gas turbine, a steam turbine operated by the steam and connected to a second generator, and a heat medium absorbing cold heat from the vaporizer to condense the steam discharged from the steam turbine. 3 may further include a heat exchanger.

이 때, 상기 제3 열교환기에는 해수가 공급되며, 상기 제3 열교환기에서, 상기 해수 및 상기 열매체를 이용하여 상기 스팀 터빈에서 배출된 수증기를 응축시킬 수 있다.In this case, sea water is supplied to the third heat exchanger, and in the third heat exchanger, the water vapor discharged from the steam turbine may be condensed using the sea water and the heat medium.

또한, 상기 기화기로 상기 열매체가 공급되는 경로에 설치되며, 상기 제1 열교환기, 상기 제2 열교환기 및 상기 제3 열교환기에서 배출된 상기 열매체를 합하는 열매체 공급부를 더 포함할 수 있다.In addition, it may further include a heat medium supply unit installed in the path through which the heat medium is supplied to the vaporizer and combines the heat medium discharged from the first heat exchanger, the second heat exchanger, and the third heat exchanger.

또한, 상기 기화기에서 상기 열매체가 배출되는 경로에 설치되며, 상기 기화기에서 배출된 상기 열매체를 분기하여, 상기 제1 열교환기, 상기 제2 열교환기 및 상기 제3 열교환기로 분배하는 열매체 분기부를 더 포함할 수 있다.In addition, further comprising a heat medium branch unit installed in the path through which the heat medium is discharged from the vaporizer, branching the heat medium discharged from the vaporizer, and distributing it to the first heat exchanger, the second heat exchanger, and the third heat exchanger. can do.

본 발명의 실시예에 따르면, 열매체 순환라인을 이용하여 액화천연가스의 냉열, 가스 터빈 및 스팀 터빈의 폐열을 통합적으로 활용할 수 있다.According to an embodiment of the present invention, the cooling heat of liquefied natural gas and waste heat of the gas turbine and the steam turbine can be integratedly utilized by using the heat medium circulation line.

도 1은 본 발명의 일 실시예에 따른 액화가스 발전 시스템을 나타낸 도면.1 is a view showing a liquefied gas power generation system according to an embodiment of the present invention.

본 출원에서 사용한 용어는 단지 특정한 실시예를 설명하기 위해 사용된 것으로, 본 발명을 한정하려는 의도가 아니다. 단수의 표현은 문맥상 명백하게 다르게 뜻하지 않는 한, 복수의 표현을 포함한다.The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

본 출원에서, 어떤 부분이 어떤 구성요소를 "포함"한다고 할 때, 이는 특별히 반대되는 기재가 없는 한 다른 구성요소를 제외하는 것이 아니라 다른 구성요소를 더 포함할 수 있는 것을 의미한다. 또한, 명세서 전체에서, "상에"라 함은 대상 부분의 위 또는 아래에 위치함을 의미하는 것이며, 반드시 중력 방향을 기준으로 상 측에 위치하는 것을 의미하는 것이 아니다.In the present application, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. In addition, throughout the specification, the term "on" means to be positioned above or below the target portion, and does not necessarily mean to be positioned above the direction of gravity.

또한, 결합이라 함은, 각 구성 요소 간의 접촉 관계에 있어, 각 구성 요소 간에 물리적으로 직접 접촉되는 경우만을 뜻하는 것이 아니라, 다른 구성이 각 구성 요소 사이에 개재되어, 그 다른 구성에 구성 요소가 각각 접촉되어 있는 경우까지 포괄하는 개념으로 사용하도록 한다.In addition, the term “couple” does not mean only a case in which each component is in direct physical contact with each other in the contact relationship between each component, but a different component is interposed between each component, and the component is It should be used as a concept that encompasses each contact.

또한, 제1, 제2 등의 용어는 다양한 구성요소들을 설명하는데 사용될 수 있지만, 상기 구성요소들은 상기 용어들에 의해 한정되어서는 안 된다. 상기 용어들은 하나의 구성요소를 다른 구성요소로부터 구별하는 목적으로만 사용된다.In addition, terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another component.

도면에서 나타난 각 구성의 크기 및 두께는 설명의 편의를 위해 임의로 나타내었으므로, 본 발명이 반드시 도시된 바에 한정되지 않는다.Since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to what is shown.

이하, 본 발명에 따른 액화가스 발전 시스템의 실시예를 첨부도면을 참조하여 상세히 설명하기로 하며, 첨부 도면을 참조하여 설명함에 있어, 동일하거나 대응하는 구성 요소는 동일한 도면번호를 부여하고 이에 대한 중복되는 설명은 생략하기로 한다.Hereinafter, embodiments of the liquefied gas power generation system according to the present invention will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same or corresponding components are assigned the same reference numbers and overlapped therewith. Description will be omitted.

도 1은 본 발명의 일 실시예에 따른 액화가스 발전 시스템을 나타낸 도면이다.1 is a view showing a liquefied gas power generation system according to an embodiment of the present invention.

도 1을 참조하면, 본 발명의 일 실시예에 따른 액화가스 발전 시스템은, 가스 터빈(10), 열매체 순환라인(20), 제1 열교환기(30) 및 제2 열교환기(40)를 포함한다.Referring to FIG. 1, a liquefied gas power generation system according to an embodiment of the present invention includes a gas turbine 10, a heat medium circulation line 20, a first heat exchanger 30 and a second heat exchanger 40. do.

가스 터빈(10)은 기화된 가스(1)를 연소시켜서 작동하여 회전력을 발생시킨다. 가스 터빈(10)에는 기화기(5)가 연결되며, 기화기(5)는 액화가스를 기화시켜 가스 터빈(10)으로 유입 시킨다. 액화가스로는 액상의 다양한 연료가 적용될 수 있으나, 본 실시예에서는 액화천연가스(LNG)를 기준으로 설명한다. 가스 터빈(10)에는 제1 발전기(12)가 연결되어 가스 터빈(10)에서 발생된 회전력을 이용하여 전기를 생산할 수 있다.The gas turbine 10 operates by burning the vaporized gas 1 to generate rotational force. A vaporizer 5 is connected to the gas turbine 10, and the vaporizer 5 vaporizes the liquefied gas and flows it into the gas turbine 10. Various liquid fuels may be applied as the liquefied gas, but in this embodiment, a description will be made based on liquefied natural gas (LNG). The first generator 12 is connected to the gas turbine 10 to generate electricity by using the rotational force generated by the gas turbine 10.

도 1을 참조하면, 저장탱크에 저장된 액화천연가스(LNG)가 펌프(3)를 통하여 기화기(5)에 공급되어 기화될 수 있다. 이 때, 증발가스(BOG)도 재응축기(2)를 통하여 액화되어 저장탱크의 액화천연가스와 같이 기화기(5)로 공급될 수 있다.Referring to FIG. 1, liquefied natural gas (LNG) stored in a storage tank may be supplied to a vaporizer 5 through a pump 3 to be vaporized. At this time, the boil-off gas (BOG) can also be liquefied through the recondenser 2 and supplied to the vaporizer 5 like the liquefied natural gas in the storage tank.

기화기(5)를 지나 기화된 가스(1)는 가스 터빈(10)으로 공급되고, 연소기가 가스(1)를 연소시켜서 가스 터빈(10)을 회전시킬 수 있다. 이때, 기화된 가스(1)를 연소에 적합한 온도로 가열하는 가열기(6)가 가스 터빈(10) 이전에 설치될 수 있다. 가열기(6)는 후술할 스팀 보일러(50)에서 발생한 수증기를 열원으로 이용할 수 있다.The gas 1 vaporized after passing through the carburetor 5 is supplied to the gas turbine 10, and the combustor burns the gas 1 to rotate the gas turbine 10. At this time, a heater 6 for heating the vaporized gas 1 to a temperature suitable for combustion may be installed before the gas turbine 10. The heater 6 may use steam generated in the steam boiler 50 to be described later as a heat source.

열매체 순환라인(20)은, 열매체를 순환시켜 액화가스를 기화시키는 기화기(5)에서 액화가스의 냉열을 흡수한다. 열매체로는, 예를 들어, 글리콜 워터(Glycol Water), 프로판(Propane) 또는 유기냉매 등이 사용될 수 있다.The heating medium circulation line 20 absorbs the cold heat of the liquefied gas in the vaporizer 5 for circulating the heating medium to vaporize the liquefied gas. As the heating medium, for example, glycol water, propane, or an organic refrigerant may be used.

이 때, 열매체 순환라인(20)은 흡수한 냉열을 필요한 곳에 분배하는 열매체 분기부(25)를 구비할 수 있다. 또한, 열매체 순환라인(20)은 발전에서 발생하는 폐열을 합하는 열매체 공급부(23)를 더 구비할 수 있다.At this time, the heat medium circulation line 20 may include a heat medium branch 25 for distributing the absorbed cold heat to a required place. In addition, the heating medium circulation line 20 may further include a heating medium supplying part 23 that combines waste heat generated from power generation.

도 1을 참조하면, 열매체 순환라인(20)은 기화기(5)에 열매체를 공급하는 공급경로(22) 및 열매체가 기화기에서 배출되는 배출경로(24)을 포함하여, 기화기(5)를 지나면서 기화기(5)에서 액화가스의 냉열을 흡수할 수 있다. 열매체 분기부(25)는 기화기(5)에서 열매체가 배출되는 경로(24)에 설치되며, 기화기(5)에서 배출된 열매체를 분기할 수 있다. 본 실시예의 열매체 분기부(25)는 후술할 제1 열교환기(30), 제2 열교환기(40) 및 제3 열교환기(70)로 향하는 3개의 라인(20a, 20b, 20c)으로 분기되어 열매체를 분배할 수 있다.Referring to FIG. 1, the heating medium circulation line 20 includes a supply path 22 for supplying a heating medium to the vaporizer 5 and a discharge path 24 through which the heating medium is discharged from the vaporizer, while passing through the vaporizer 5 The carburetor 5 can absorb the cold heat of the liquefied gas. The heating medium branching part 25 is installed in the path 24 through which the heating medium is discharged from the vaporizer 5, and may branch the heating medium discharged from the vaporizer 5. The heat medium branch 25 of this embodiment is branched into three lines 20a, 20b, and 20c directed to the first heat exchanger 30, the second heat exchanger 40, and the third heat exchanger 70 to be described later. Heat medium can be distributed.

또한, 열매체 공급부(23)는 기화기(5)로 열매체가 공급되는 경로(22)에 설치되며, 분기되었던 열매체가 다시 합하여지는 구조를 가질 수 있다. 본 실시예의 열매체 공급부(23)는 분기된 3개의 라인(20a, 20b, 20c)이 다시 모이는 구조를 가져서, 제1 열교환기(30), 제2 열교환기(40) 및 제3 열교환기(70)에서 배출된 열매체를 합할 수 있다.In addition, the heat medium supply unit 23 is installed in the path 22 through which the heat medium is supplied to the vaporizer 5, and may have a structure in which the branched heat medium is recombined. The heat medium supply unit 23 of this embodiment has a structure in which the branched three lines 20a, 20b, and 20c are gathered again, so that the first heat exchanger 30, the second heat exchanger 40, and the third heat exchanger 70 ) Can be combined.

제1 열교환기(30)는, 기화기(5)에서 냉열을 흡수한 열매체를 이용하여 가스 터빈(10)에 공급되는 공기를 냉각한다. 제1 열교환기(30)는, 가스 터빈(10)에 공급되는 공기를 발전의 효율이 높은 최적온도로 낮출 수 있다. 즉, 열매체가 흡수한 냉열을 이용하여 가스 터빈(10)에 공급되는 공기의 온도를 낮추어 가스 터빈(10)의 효율을 높일 수 있다.The first heat exchanger 30 cools the air supplied to the gas turbine 10 by using a heat medium absorbing cold heat from the vaporizer 5. The first heat exchanger 30 may lower the air supplied to the gas turbine 10 to an optimum temperature with high power generation efficiency. That is, the efficiency of the gas turbine 10 may be increased by lowering the temperature of air supplied to the gas turbine 10 by using the cold heat absorbed by the heating medium.

도 1을 참조하면, 제1 열교환기(30)는 열매체 분기부(25)에서 냉열을 가진 열매체를 공급받고, 냉열을 사용한 열매체를 열매체 공급부(23)로 다시 공급할 수 있다.Referring to FIG. 1, the first heat exchanger 30 may receive a heat medium having cold heat from the heat medium branch 25 and supply the heat medium using cold heat to the heat medium supply unit 23 again.

제2 열교환기(40)는, 기화기(5)로 공급되는 열매체로 가스 터빈(10)의 폐열을 흡수한다. 구체적으로, 제2 열교환기(40)에서 가스 터빈(10)의 배기가스(11)와 열매체가 열교환하여 열매체가 폐열을 흡수하고, 폐열을 흡수한 열매체는 기화기(5)로 공급될 수 있다. 이에 따라, 기화기(5)에서 열매체가 흡수한 폐열을 이용하여 액화가스를 기화시킬 수 있다.The second heat exchanger 40 absorbs waste heat from the gas turbine 10 with a heat medium supplied to the vaporizer 5. Specifically, in the second heat exchanger 40, the exhaust gas 11 of the gas turbine 10 and the heat medium exchange heat so that the heat medium absorbs waste heat, and the heat medium absorbing the waste heat may be supplied to the vaporizer 5. Accordingly, the liquefied gas can be vaporized using the waste heat absorbed by the heat medium in the vaporizer 5.

도 1을 참조하면, 제2 열교환기(40)는 폐열을 가진 열매체를 열매체 공급부(23)로 공급하고, 기화기(5)에서 폐열을 사용한 열매체를 열매체 분기부(25)에서 공급받을 수 있다.Referring to FIG. 1, the second heat exchanger 40 may supply a heat medium having waste heat to the heat medium supply unit 23, and a heat medium using the waste heat from the vaporizer 5 may be supplied from the heat medium branch 25.

따라서, 본 발명의 실시예에 따르면, 열매체 순환라인(20)을 이용하여 액화천연가스의 냉열, 가스 터빈의 폐열을 통합적으로 활용할 수 있다.Accordingly, according to an embodiment of the present invention, the cooling heat of liquefied natural gas and waste heat of the gas turbine can be integratedly utilized by using the heating medium circulation line 20.

한편, 액화가스 발전 시스템은, 가스 터빈(10)의 배기가스가 가진 폐열을 더욱 효과적으로 이용할 수 있도록, 스팀 보일러(50) 및 스팀 터빈(60)을 더 포함할 수 있다.Meanwhile, the liquefied gas power generation system may further include a steam boiler 50 and a steam turbine 60 so as to more effectively use waste heat of the exhaust gas of the gas turbine 10.

도 1을 참조하면, 스팀 보일러(50)는 가스 터빈(10)의 배기가스(11)가 배출되는 경로에 설치되어 가스 터빈(10)의 폐열로 수증기를 생성할 수 있다. 스팀 터빈(60)은 스팀 보일러(50)에서 생성된 수증기로 작동되어 회전력을 발생한다. 스팀 터빈(60)에는 제2 발전기(62)가 연결되어 전기를 발생할 수 있다.Referring to FIG. 1, the steam boiler 50 may be installed in a path through which the exhaust gas 11 of the gas turbine 10 is discharged to generate steam as waste heat of the gas turbine 10. The steam turbine 60 is operated with steam generated by the steam boiler 50 to generate rotational force. The second generator 62 may be connected to the steam turbine 60 to generate electricity.

이 때, 냉열을 이용하여 수증기를 응축 시키는 제3 열교환기(70)를 더 포함할 수 있다. 제3 열교환기(70)는 기화기(5)에서 냉열을 흡수한 열매체로 스팀 터빈(60)에서 배출된 수증기를 응축 시킬 수 있다. 특히, 제3 열교환기(70)는 냉열뿐만 아니라 해수를 추가로 이용하여 스팀 터빈(60)에서 배출된 수증기를 응축시킬 수 있다.In this case, a third heat exchanger 70 for condensing water vapor using cold heat may be further included. The third heat exchanger 70 is a heat medium absorbing cold heat from the vaporizer 5 and may condense water vapor discharged from the steam turbine 60. In particular, the third heat exchanger 70 may condense steam discharged from the steam turbine 60 by additionally using seawater as well as cold heat.

도 1을 참조하면, 제3 열교환기(70)에는 해수가 공급될 수 있다. 이에 따라, 제3 열교환기(70)에서 해수, 열매체 및 수증기가 동시에 열교환이 이루어질 수 있고, 온도가 가장 높은 수증기가 빠르게 냉각되어 응축될 수 있다.Referring to FIG. 1, sea water may be supplied to the third heat exchanger 70. Accordingly, in the third heat exchanger 70, seawater, a heat medium, and water vapor can be simultaneously heat-exchanged, and the water vapor having the highest temperature can be rapidly cooled and condensed.

제3 열교환기(70)는 열매체 분기부(25)에서 냉열을 가진 열매체를 공급받아 냉열을 수증기 응축에 사용하고, 스팀 터빈(60)의 폐열 및 해수의 열을 공급은 열매체는 열매체 공급부(23)로 공급할 수 있다.The third heat exchanger 70 receives a heat medium having cold heat from the heat medium branch 25 and uses the cold heat for condensation of water vapor, and the heat medium supplying waste heat from the steam turbine 60 and heat of seawater is a heat medium supply unit 23 ) Can be supplied.

이상, 본 발명의 바람직한 실시예에 대하여 설명하였으나, 해당 기술분야에서 통상의 지식을 가진 자라면 특허청구범위에 기재된 본 발명의 사상으로부터 벗어나지 않는 범위 내에서, 구성요소의 부가, 변경, 삭제 또는 추가 등에 의해 본 발명을 다양하게 수정 및 변경시킬 수 있을 것이며, 이 또한 본 발명의 권리범위 내에 포함된다고 할 것이다.In the above, preferred embodiments of the present invention have been described, but those of ordinary skill in the art will add, change, delete or add components within the scope not departing from the spirit of the present invention described in the claims. Various modifications and changes can be made to the present invention by means of the like, and this will also be said to be included within the scope of the present invention.

1: 액화가스 5: 기화기
10: 가스 터빈 12: 제1 발전기
20: 열매체 순환라인 23: 열매체 공급부
25: 열매체 분기부 30: 제1 열교환기
40: 제2 열교환기 50: 스팀 보일러
60: 스팀 터빈 62: 제2 발전기
70: 제3 열교환기1: liquefied gas 5: vaporizer
10: gas turbine 12: first generator
20: heat medium circulation line 23: heat medium supply unit
25: heat medium branch 30: first heat exchanger
40: second heat exchanger 50: steam boiler
60: steam turbine 62: second generator
70: third heat exchanger

Claims (5)

액화가스를 기화한 가스로 작동되고 제1 발전기에 연결된 가스 터빈;
열매체를 순환시켜 액화가스를 기화시키는 기화기에서 액화가스의 냉열을 흡수하는 열매체 순환라인;
상기 기화기에서 냉열을 흡수한 상기 열매체를 이용하여 상기 가스 터빈에 공급되는 공기를 냉각하는 제1 열교환기; 및
상기 기화기로 공급되는 상기 열매체로 상기 가스 터빈의 폐열을 흡수하는 제2 열교환기를 포함하는 액화가스 발전 시스템.A gas turbine that is operated with gas obtained by vaporizing liquefied gas and connected to the first generator;
A heating medium circulation line for absorbing cold heat of the liquefied gas in the vaporizer for circulating the heating medium to vaporize the liquefied gas;
A first heat exchanger for cooling the air supplied to the gas turbine by using the heat medium absorbing cold heat from the vaporizer; And
Liquefied gas power generation system comprising a second heat exchanger for absorbing waste heat from the gas turbine with the heat medium supplied to the vaporizer. 제1항에 있어서,
상기 가스 터빈의 폐열로 수증기를 생성하는 스팀 보일러;
상기 수증기로 작동되고 제2 발전기로 연결된 스팀 터빈; 및
상기 기화기에서 냉열을 흡수한 상기 열매체로 상기 스팀 터빈에서 배출된 수증기를 응축 시키는 제3 열교환기를 더 포함하는 액화가스 발전 시스템.The method of claim 1,
A steam boiler generating steam from waste heat of the gas turbine;
A steam turbine operated by the steam and connected to a second generator; And
Liquefied gas power generation system further comprising a third heat exchanger for condensing the steam discharged from the steam turbine with the heat medium absorbing cold heat from the vaporizer. 제2항에 있어서,
상기 제3 열교환기에는 해수가 공급되며,
상기 제3 열교환기에서, 상기 해수 및 상기 열매체를 이용하여 상기 스팀 터빈에서 배출된 수증기를 응축시키는 액화가스 발전 시스템.The method of claim 2,
Seawater is supplied to the third heat exchanger,
In the third heat exchanger, a liquefied gas power generation system for condensing water vapor discharged from the steam turbine using the seawater and the heat medium. 제2항에 있어서,
상기 기화기로 상기 열매체가 공급되는 경로에 설치되며,
상기 제1 열교환기, 상기 제2 열교환기 및 상기 제3 열교환기에서 배출된 상기 열매체를 합하는 열매체 공급부를 더 포함하는 액화가스 발전 시스템.The method of claim 2,
It is installed in the path through which the heat medium is supplied to the vaporizer,
Liquefied gas power generation system further comprising a heat medium supply unit for combining the heat medium discharged from the first heat exchanger, the second heat exchanger and the third heat exchanger. 제2항에 있어서,
상기 기화기에서 상기 열매체가 배출되는 경로에 설치되며,
상기 기화기에서 배출된 상기 열매체를 분기하여, 상기 제1 열교환기, 상기 제2 열교환기 및 상기 제3 열교환기로 분배하는 열매체 분기부를 더 포함하는 액화가스 발전 시스템.The method of claim 2,
It is installed in the path through which the heat medium is discharged from the vaporizer,
A liquefied gas power generation system further comprising a heat medium branch for branching the heat medium discharged from the vaporizer and distributing it to the first heat exchanger, the second heat exchanger, and the third heat exchanger.
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