KR101629363B1 - Electric power producing system using waste heat recovery - Google Patents

Electric power producing system using waste heat recovery Download PDF

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KR101629363B1
KR101629363B1 KR1020150002100A KR20150002100A KR101629363B1 KR 101629363 B1 KR101629363 B1 KR 101629363B1 KR 1020150002100 A KR1020150002100 A KR 1020150002100A KR 20150002100 A KR20150002100 A KR 20150002100A KR 101629363 B1 KR101629363 B1 KR 101629363B1
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steam
engine
fuel
waste heat
amount
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KR1020150002100A
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Korean (ko)
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남병탁
양창식
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대우조선해양 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • 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
    • F01K23/065—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 the combustion taking place in an internal combustion piston engine, e.g. a diesel engine
    • 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
    • F01K23/103—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 with afterburner in exhaust boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage
    • 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
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system

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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)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The present invention relates to an electric power producing system using waste heat recovery. According to an embodiment of the present invention, the electric power producing system using waste heat recovery comprises: a dual-fuel engine driven by receiving one or more among gas fuel and liquid fuel; an economizer to receive exhaust gas emitted from the dual-fuel engine to produce steam using waste heat of the exhaust gas as a heat source; an auxiliary boiler to receive the liquid fuel to additionally produce steam using combustion heat of the liquid fuel if an amount of the steam produced by the economizer is insufficient; and a steam turbine generator to receive a portion of the steam discharged from the economizer and the auxiliary boiler to produce energy. According to the present invention, since discarded waste heat is recovered to produce electric power, an engine does not need to be operated to produce additional power required for a ship, thereby saving fuel costs.

Description

폐열회수를 이용한 전력생산 시스템{ELECTRIC POWER PRODUCING SYSTEM USING WASTE HEAT RECOVERY}BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power generation system using waste heat recovery,

본 발명은 폐열회수를 이용한 전력생산 시스템에 관한 것으로, 더욱 상세하게는 폐열 회수 장치에서 생산된 전력을 선박을 운용하는데 이용할 수 있는 폐열회수를 이용한 전력생산 시스템에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation system using waste heat recovery, and more particularly, to a power generation system using waste heat recovery that can be used to operate a ship generated by a waste heat recovery apparatus.

천연가스(natural gas)는 메탄(methane)이 주성분이며, 소량의 에탄(ethane) 및 프로판(propane) 등이 포함된 화학연료이다. 이러한 천연가스는 최근 다양한 기술분야에서 저공해 에너지원으로 각광을 받고 있으며, 특히, LNG는 비교적 저렴하면서도 공해 유발이 적어 발전을 위한 연료로 많이 사용되고 있다.Natural gas is a chemical fuel that is mainly composed of methane and contains small amounts of ethane and propane. In recent years, natural gas has attracted attention as a low-pollution energy source in various technical fields. In particular, LNG is used as a fuel for power generation because it is relatively inexpensive and has little pollution.

최근에는 천연가스를 운반하거나 채굴하는 선박에 가스를 주 연료로 사용하면서 연료유(fuel oil)도 사용할 수 있는 이중연료 엔진(dual fuel engine, DF engine)이 적용된 시스템이 개발되었다. 천연가스는 연료유에 비해 배기가스 중의 황산화물(SOx)나 질소산화물(NOx)의 함량이 적어 친환경적이고 선박에 대한 국제적인 배기가스 배출규제 기준들을 충족할 수 있으며, 연료비용을 절약할 수 있다는 장점이 있다.Recently, a system using a dual fuel engine (DF engine) has been developed which can use fuel oil as a main fuel for ships carrying or mining natural gas. Natural gas has less SOx and NOx content than fuels and is environmentally friendly. It can meet international emissions standards for ships and saves fuel costs. have.

하지만, 가스만을 이용하여 선박을 운용할 때의 엔진의 부하가 연료유를 이용하였을 때보다 약 2배 정도 느린 단점이 있다. 그렇기 때문에 빠른 가속 또는 감속이 필요한 항구 접안 시, 또는 급속 후진(crash astern) 등의 상황에서 선박을 가스만으로 운용하지 않고, 연료유를 함께 이용하거나 연료유만으로 선박을 운용한다. 이는 무리하게 선박을 가스만으로 선박을 운용할 경우, 엔진이 손상되거나 주 전력 주파수가 불안정하여 선박 내 정전을 유발할 수 있는 문제가 있다.However, there is a disadvantage that the load of the engine when operating the vessel using only gas is about twice as slow as that when the fuel oil is used. Therefore, in case of a berthing or a crash astern, which requires fast acceleration or deceleration, the ship is not operated by gas alone, but fuel oil is used together or the vessel is operated by fuel oil alone. This is problematic in that, when a ship is operated with a gas alone, the engine may be damaged or the main power frequency may be unstable, causing a power failure in the ship.

특히, 항구 접안(manoeuvring) 시 요구되는 선박의 가감속은 가스만을 이용한 운전 시, 엔진의 부하 변경 정도가 도 1에 도시된 바와 같이, 엔진의 허용치를 초과하기 때문에 연료유만을 이용하도록 전환한 상태에서 항구 접안을 수행하고 있다.Particularly, in the case of the acceleration / deceleration of a ship required at the time of maneuvering, since the load change degree of the engine exceeds the allowable value of the engine as shown in Fig. 1, It is in the harbor.

그런데, 상기와 같이, 연료유만을 이용하여 항구 접안 시, 필요한 스팀의 양이 약 400 ~ 800kg/h 가 부족한 문제가 있다. 이렇게 부족한 스팀의 양을 보충하기 위해 보일러를 추가로 구동시키는데, 통상적으로 이용하는 보일러를 최소한으로 구동시키더라도 약 2145kg/h의 스팀이 발생하기 때문에 항구 접안 시에 필요한 스팀의 양보다 많이 생산되어 남는 스팀은 폐기되는 문제가 있다(여기서, 통상적인 보일러에서 생산되는 스팀의 양은 6500kg/h이며, 보일러를 최소 구동시킬 때 약 33%만 구동시킬 수 있어 보일러를 최소한으로 구동시킬 때 발생되는 스팀의 양은 약 2145kg/h임).However, as described above, there is a problem that the amount of steam required is about 400 to 800 kg / h when the port is ridden using only fuel oil. In order to compensate for the insufficient amount of steam, the boiler is further driven. Since steam generated at a minimum of about 2145 kg / h is generated even when the boiler used at the minimum is operated, the amount of steam (Here, the amount of steam produced in a typical boiler is 6500 kg / h, and when the boiler is driven at a minimum, it can be driven only about 33%). When the boiler is driven at a minimum, 2145 kg / h).

대한민국 공개특허 제10-2014-0024532호(공개일: 2014.03.03)Korean Patent Publication No. 10-2014-0024532 (Publication date: 2014.03.03)

본 발명이 해결하고자 하는 과제는, 연료유만을 이용하여 선박을 운전할 때, 버려지는 폐열을 재활용하여 전력을 생산할 수 있는 폐열회수를 이용한 전력생산 시스템을 제공하는 것이다.SUMMARY OF THE INVENTION It is an object of the present invention to provide a power generation system using waste heat recovery capable of producing electric power by recycling waste heat that is discarded when a ship is operated using only fuel oil.

본 발명의 일 실시예에 따른 폐열회수를 이용한 전력발생 시스템은, 가스연료 및 액체연료 중 어느 하나 이상을 연료로 공급받아 구동되는 이중연료 엔진, 상기 이중연료 엔진에서 배출되는 배기가스를 공급받아 상기 배기가스의 폐열을 열원으로 스팀을 생산하는 이코노마이저, 상기 이코노마이저에서 생산된 스팀의 생산량이 부족할 경우, 액체연료를 공급받아 그 연소열로 스팀을 추가 생산하는 보조보일러 및 상기 이코노마이저 및 보조보일러에서 배출된 스팀 중 일부를 공급받아 에너지를 생산하는 증기터빈 발전기를 포함한다.A power generation system using waste heat recovery according to an embodiment of the present invention includes a dual fuel engine driven by being supplied with at least one of a gas fuel and a liquid fuel as fuel, An economizer for producing steam from the waste heat of the exhaust gas as a heat source, an auxiliary boiler for supplying the liquid fuel and producing steam by the combustion heat when the produced amount of the steam produced by the economizer is insufficient, And steam turbine generators that supply some of the energy and produce energy.

그리고 상기 이중연료 엔진 및 증기터빈 발전기에서 생산된 에너지를 공급받아 구동되는 엔진추진장치를 더 포함할 수 있고, 상기 엔진추진장치에 전기적으로 연결되는 저항수단을 더 포함할 수 있다. 이때, 상기 저항수단은 상기 이중연료 엔진이 특정 값보다 낮은 부하로 운전될 때, 상기 이중연료 엔진의 과잉전류를 소모할 수 있고, 상기 저항수단은 브레이킹 레지스터(Breaking Resistors)일 수 있다.The apparatus may further include an engine propulsion unit driven by energy generated from the dual fuel engine and the steam turbine generator, and may further include a resistance unit electrically connected to the engine propulsion unit. At this time, the resistance means may consume an excess current of the dual fuel engine when the double fuel engine is operated at a load lower than a specific value, and the resistance means may be a breaking resistor.

또한, 상기 이코노마이저 및 보조보일러에서 배출된 스팀을 스팀소모처에 공급하는 스팀공급라인을 더 포함하고, 상기 증기터빈 발전기는 상기 스팀공급라인을 통해 이송되는 스팀의 일부를 공급받을 수 있다.The steam turbine generator may further include a steam supply line for supplying the steam discharged from the economizer and the auxiliary boiler to the steam consuming unit. The steam turbine generator may receive a portion of the steam transferred through the steam supply line.

그리고 상기 증기터빈 발전기에서 생산되는 전력량을 조절하기 위해 상기 엔진추진장치와 전기적으로 연결되는 전력관리부를 더 포함할 수 있다.
And a power management unit electrically connected to the engine propulsion unit to regulate an amount of power produced by the steam turbine generator.

한편, 본 발명의 다른 실시예에 따른 폐열회수를 이용한 전력발생 시스템은, 가스연료 및 액체연료 중 어느 하나 이상을 연료로 공급받아 구동되는 이중연료 엔진 및 상기 이중연료 엔진에서 배출되는 배기가스의 폐열을 열원으로 스팀을 생산하는 스팀생산수단을 포함하여, 상기 스팀생산수단으로부터 스팀을 공급받아 전력을 생산하는 것을 특징으로 한다.Meanwhile, a power generation system using waste heat recovery according to another embodiment of the present invention includes a dual fuel engine driven by supplying at least one of gas fuel and liquid fuel as fuel and waste heat of exhaust gas discharged from the dual fuel engine And a steam producing means for producing steam by a heat source, wherein steam is supplied from the steam producing means to produce electric power.

그리고, 상기 스팀생산수단은, 상기 이중연료 엔진에서 배출되는 배기가스를 공급받아 상기 배기가스의 폐열을 열원으로 스팀을 생산하는 이코노마이저(Exhaust Gas Economizer, EGE)일 수 있고,The steam producing means may be an exhaust gas economizer (EGE) which receives exhaust gas discharged from the dual fuel engine and produces steam by using waste heat of the exhaust gas as a heat source,

상기 스팀생산수단은, 상기 이코노마이저에서 생산된 스팀의 생산량이 부족할 경우, 액체연료를 공급받아 그 연소열로 스팀을 추가 생산하는 보조보일러(Auxiliary Boiler)를 더 포함할 수 있다.The steam producing means may further include an auxiliary boiler for supplying the liquid fuel and further producing steam by the combustion heat when the amount of steam produced by the economizer is insufficient.

또한, 상기 이코노마이저에서 배출된 스팀을 공급받아 전력을 생산하는 증기터빈 발전기 및 상기 이중연료 엔진 및 증기터빈 발전기에서 생산된 에너지를 공급받아 구동되는 엔진추진장치를 또한 포함할 수 있고,The steam generator may further include a steam turbine generator for receiving steam discharged from the economizer to generate electric power, and an engine propulsion device driven by energy supplied from the dual fuel engine and the steam turbine generator,

상기 엔진추진장치에 전기적으로 연결되는 저항수단을 더 포함하고, 상기 저항수단은 상기 이중연료 엔진이 특정 값보다 낮은 부하로 운전될 때, 상기 이중연료 엔진의 과잉전류를 소모하는 것을 보다 구체적인 특징으로 한다.Further comprising resistance means electrically connected to the engine propulsion device, wherein the resistance means is configured to consume an excess current of the dual fuel engine when the double fuel engine is operated at a load lower than a specific value do.

본 발명에 의하면, 버려지는 폐열을 회수하여 전력을 생산하기 때문에 선박에 추가 필요한 전력을 생산하기 위해 엔진을 운전시키기 않아도 되므로, 그에 따른 연료비용을 절약할 수 있는 효과가 있다. 더욱이, 평소 가스를 연료로 이용하여 선박을 운항시킬 때에도 폐열을 이용하여 전력을 생산할 수 있어, 엔진의 부하를 감소시켜 연료비를 절약할 수 있는 효과가 있다.According to the present invention, since the waste heat is recovered to produce electric power, it is not necessary to operate the engine in order to produce additional electric power required for the ship, and thus the fuel cost can be saved. Furthermore, even when the gas is used as a fuel for normal operation of the ship, it is possible to produce electric power by using the waste heat, thereby reducing the load on the engine and saving the fuel cost.

도 1은 항구 접안 시 엔진의 부하 변동 조건의 일례를 나타낸 그래프이다.
도 2는 본 발명의 일 실시예에 따른 폐열회수를 이용한 전력생산 시스템을 개략적으로 도시한 구성도이다.FIG. 1 is a graph showing an example of a load fluctuation condition of an engine when a port is ridden.
2 is a schematic view illustrating a power generation system using waste heat recovery according to an embodiment of the present invention.

본 발명의 바람직한 실시예에 대하여 첨부된 도면을 참조하여 더 구체적으로 설명한다.Preferred embodiments of the present invention will be described more specifically with reference to the accompanying drawings.

도 2는 본 발명의 일 실시예에 따른 폐열회수를 이용한 전력생산 시스템을 개략적으로 도시한 구성도이다.2 is a schematic view illustrating a power generation system using waste heat recovery according to an embodiment of the present invention.

본 발명의 폐열회수를 이용한 전력생산 시스템(1)은 액화가스를 운용하는 선박, 예컨대, 액화천연가스 운반선(LNG carrier, LNGC), 액화에탄가스 운반선(liquefied ethane gas carrier, LEGC) 등 해상에서 운용되어 액화가스를 저장할 수 있는 장치를 가진 모든 선박 및 해상 부유 구조물에 적용될 수 있다. 물론, 본 발명은 상기의 선박이나 해상 부유 구조물에만 한정되는 것이 아니며, 엔진 운전에 있어서 가스를 주 연료로 사용하고 엔진에서 배출된 배기가스의 폐열을 재활용할 수 있는 폐열 회수 장치가 이용될 수 있으면 무관하게 적용될 수 있다.The power generation system 1 using waste heat recovery of the present invention can be applied to a ship operating liquefied gas such as LNG carrier (LNGC), liquefied ethane gas carrier (LEGC) And can be applied to all ships and marine floating structures with devices capable of storing liquefied gas. Of course, the present invention is not limited to the above-described marine vessel or floating structure, but a waste heat recovering device which can use waste gas as the main fuel in the engine operation and recycle the exhaust gas discharged from the engine can be used But can be applied irrespective of the type.

도 2에 도시된 바와 같이, 본 발명의 폐열회수를 이용한 전력생산 시스템(1)은 이중연료 엔진(10), 엔진추진 장치(40), 저항수단(BR), 증기터빈 발전기(50), 진공응축기(60), 응축수 이송펌프(70) 및 전력관리부(80)를 포함한다.2, the power generation system 1 using waste heat recovery of the present invention includes a dual fuel engine 10, an engine propulsion unit 40, a resistance unit BR, a steam turbine generator 50, a vacuum A condenser 60, a condensate transfer pump 70, and a power management unit 80.

이중연료 엔진(10)은 HFO(Heavy Fuel Oil), MDO(Marine Diesel Oil) 및 MGO(Marine Gas Oil) 등의 액체연료와 함께 천연가스나 액화가스에서 자연 기화되거나 강제 기화된 기화가스(예컨대, BOG, boil-off gas) 등의 가스연료를 모두 연료로 사용할 수 있으며, 가스연료를 주 연료로 이용하되, 상기에서 나열된 연료를 각각의 모드로 설정하여 선택적으로 이용하여 운전할 수 있는 발전용 도는 추진용 엔진일 수 있다. 본 발명의 일 실시예에서는 이중연료를 공급받아 발전하여 그 전기에너지를 이용하여 모터나 프로펠러를 돌려 추진력을 얻을 수 있는 이중연료 디젤전기추진방식 즉, DFDE(dual fuel diesel electric)에 적용되는 것을 예로 들어 설명한다.The dual fuel engine 10 can be a natural gas or a liquefied natural gas or a vaporized gas which is forcedly vaporized together with a liquid fuel such as HFO (Heavy Fuel Oil), Marine Diesel Oil (MDO) and Marine Gas Oil (MGO) BOG, boil-off gas, etc.) can be used as fuel, and gas fuel can be used as the main fuel, and the fuel listed in the above can be set to each mode, For example. In an embodiment of the present invention, a dual fuel diesel electric propulsion system, that is, a dual fuel diesel electric (DFDE) system, which is powered by a dual fuel and uses electric energy to rotate a motor or a propeller, I will explain it.

엔진추진 장치(40)는 이중연료 엔진(10)에서 전기에너지를 전달받아 모터나 프로펠러에서 운동에너지로 전환하여 선박의 속도를 조절할 수 있다.The engine propulsion unit 40 can receive the electric energy from the dual fuel engine 10 and convert it into kinetic energy from a motor or a propeller to adjust the speed of the ship.

저항수단(BR)은 엔진추진 장치(40)에 설치될 수 있고, 엔진추진 장치(40)와 전기적으로 연결될 수 있다. 즉, 저항수단(BR)은 일종의 전류 부하 장치로, 브레이킹 레지스터(breaking resistors, BR)일 수 있다. 이때, 전류를 소모하면서 온도가 상승한 저항수단(BR)은 선박에서 사용되는 냉각수를 공급하여 냉각시켜 연속적으로 사용할 수 있다.The resistance means BR may be installed in the engine propulsion device 40 and may be electrically connected to the engine propulsion device 40. [ That is, the resistance means BR may be a kind of current load device, and may be breaking resistors (BR). At this time, the resistance means BR whose temperature is increased while consuming the electric current can be continuously used by cooling the cooling water used in the ship.

그리고 저항수단(BR)은 저항수단(BR)과 엔진추진 장치(40)에 전기적으로 연결되는 전력관리부(80)에 의해 가동될 수 있다. 제어수단은 엔진부하조절기(ELC)일 수 있으며, 저항수단(BR)의 저항의 세기를 제어하여 이중연료 엔진(10)의 부하를 조절할 수 있다.The resistance means BR can be operated by the power management unit 80 electrically connected to the resistance means BR and the engine propulsion device 40. [ The control means may be an engine load controller (ELC), and the load of the dual fuel engine 10 may be controlled by controlling the resistance of the resistance means BR.

본 발명의 일 실시예의 폐열회수 장치를 이용한 전력생산 시스템(1)에서 폐열회수를 위한 시스템은 이코노마이저(20), 보조보일러(30), 스팀공급라인(SL)을 포함한다. 이코노마이저(20)는 이중연료 엔진(10)에서 배출되는 배기가스와 물의 열 교환이 이루어지면서 스팀을 생산하고, 보조보일러(30)는 배기가스의 양이 충분하지 않아 필요한 스팀을 생산하는데 열원이 부족할 때 액체연료를 공급받아 부족한 열원을 대신하여 스팀을 생산한다. 그리고 스팀공급라인(SL)은 이코노마이저(20)와 보조보일러(30)에서 생산된 스팀을 선박 내의 스팀소모처로 공급한다.A system for recovering waste heat in a power generation system 1 using a waste heat recovery apparatus according to an embodiment of the present invention includes an economizer 20, an auxiliary boiler 30, and a steam supply line SL. The economizer 20 produces steam by exchanging heat between the exhaust gas discharged from the dual-fuel engine 10 and water, and the auxiliary boiler 30 generates insufficient amount of exhaust gas to produce the required steam. The steam is produced by replacing the insufficient heat source by supplying the liquid fuel. The steam supply line (SL) supplies the steam produced by the economizer (20) and the auxiliary boiler (30) to the steam consumption source in the ship.

이코노마이저(20)는 이중연료 엔진(10) 1개당 1개씩 설치되거나, 이중연료 엔진(10) 다수 개 당 1개식 연결 설치될 수 있고, 이중연료 엔진(10)에서 배기가스를 공급받도록 구성된다. 이코노마이저(20)는 배기가스의 폐열에서 얻은 열로 이코노마이저(20)로 공급된 물이 증발하여 스팀을 발생시킨다. 이코노마이저(20)로 공급된 물은 캐스케이드 탱크에 저장될 수 있고, 급수펌프를 통해 이코노마이저(20)로 공급될 수 있다.The economizer 20 may be provided for each of the dual fuel engines 10 or may be connected to one of a plurality of the dual fuel engines 10 to receive the exhaust gas from the dual fuel engine 10. [ The economizer 20 generates steam by the evaporation of water supplied to the economizer 20 by the heat obtained from the waste heat of the exhaust gas. The water supplied to the economizer 20 can be stored in the cascade tank and fed to the economizer 20 via the feed pump.

이때, 이코노마이저(20)로 공급되는 배기가스의 양이 부족한 경우, 공급된 물 중 일부는 스팀이 되지 않고, 물과 스팀이 혼합된 혼합물이 이코노마이저(20)에서 배출될 수 있는데, 이는 보조보일러(30)로 공급되어 안정화된 이후에 물은 다시 이코노마이저(20)로 재공급되고 스팀은 스팀공급라인(SL)으로 공급된다.At this time, when the amount of the exhaust gas supplied to the economizer 20 is insufficient, some of the supplied water does not become steam, and a mixture of water and steam may be discharged from the economizer 20, 30 and stabilized, the water is supplied again to the economizer 20, and the steam is supplied to the steam supply line SL.

스팀공급라인(SL)은 스팀소모처로 공급되는 스팀의 양을 측정하는 유량측정수단이 포함할 수 있다. 유량측정수단은 스팀공급라인(SL)의 배관 압력을 이용하여 스팀의 양을 측정하는 압력감지기(PT)일 수 있다. 일례로, 이중연료 엔진(10) 및 폐열회수 시스템이 적용된 선박이 항구에 정박하여 매뉴버링(manoeuvering) 조작이 필요할 경우, 선박의 속도가 감소하므로 이중연료 엔진(10)의 부하가 줄어들기 때문에 배기가스의 양이 부족하여 이코노마이저(20)를 통해 생산하던 스팀의 양이 감소한다.The steam supply line (SL) may include a flow rate measuring means for measuring the amount of steam supplied to the steam consumption source. The flow rate measuring means may be a pressure sensor (PT) for measuring the amount of steam using the piping pressure of the steam supply line (SL). For example, when the dual fuel engine 10 and the ship to which the waste heat recovery system is applied are anchored in the port and a manoeuvering operation is required, the speed of the ship is reduced, so that the load of the dual fuel engine 10 is reduced, The amount of steam produced through the economizer 20 decreases due to the insufficient amount of gas.

하지만, LNG 적재 및 적하를 위한 카고(cargo) 장비의 운전 등 선박 내에서 스팀을 이용하는 양은 감소하지 않기 때문에 추가적인 스팀이 발생될 필요가 있다. 그에 따라 보조보일러(30)를 가동하여 부족한 스팀의 양을 보충한다. 하지만, 보조보일러(30)에서 생산되는 스팀의 양은 부족한 스팀 양보다 많이 생산되기 때문에 초과된 스팀은 버려진다.However, additional steam needs to be generated because the amount of steam used in the vessel, such as the operation of cargo equipment for LNG loading and loading, does not decrease. The auxiliary boiler 30 is operated to supplement the insufficient amount of steam. However, excess steam is discarded because the amount of steam produced in the auxiliary boiler (30) is greater than the amount of steam that is lacking.

본 발명의 일 실시예에서는 버려지는 스팀을 다시 회수하기 위해 스팀공급라인(SL)에서 증기터빈 발전기(50)로 버려지는 스팀을 회수한다. 증기터빈 발전기(50)는 회수된 스팀에 의해 전기를 발생시킨다. 그리고 증기터빈 발전기(50)에 필요한 스팀보다 많은 스팀이 스팀공급라인(SL)에서 회수되면, 초과된 회수 스팀은 진공응축기(60)로 공급되어 응축수로 변환되고, 변환된 응축수는 응축수 이송펌프(70)를 통해 캐스케이드 탱크로 공급된다.In one embodiment of the present invention, steam is recovered from the steam supply line (SL) to the steam turbine generator (50) to recover the discarded steam again. The steam turbine generator 50 generates electricity by the recovered steam. When more steam than the steam required for the steam turbine generator 50 is recovered in the steam supply line SL, the excess recovered steam is supplied to the vacuum condenser 60 to be converted into condensed water, and the converted condensed water is supplied to the condensate transfer pump 70) to the cascade tank.

즉, 선박이 급가속을 하거나 급정지 시 부하가 변동되는데, 이때, 변동되는 부하는 저항수단(BR)과 증기터빈 발전기(50)에서 변동폭이 조절될 수 있다. 이 중 저항수단(BR)은 변동되는 부하가 증가하더라도 이중연료 엔진(10)을 임의의 부하로 운전하지 안하도 되며, 단지, 부하가 감소하였을 때, 남는 전력을 이중연료 엔진(10)의 부하 변동 속도에 맞춰 소모하는 역할만 한다.That is, the ship is rapidly accelerated or the load at the time of a sudden stop is varied. At this time, the fluctuating load can be controlled in the resistance means BR and the steam turbine generator 50. The resistance means BR may not operate the dual fuel engine 10 at an arbitrary load even if the fluctuating load increases and only when the load is reduced, It only serves to consume at the rate of change.

그에 따라 부하가 증가하면, 증기터빈 발전기(50)에서 회수된 증기를 이용하여 전력을 생산하여 부족한 전력을 보충할 수 있다. 이때, 증기터빈 발전기(50)의 부하변동 허용치는 이중연료 엔진(10)과는 달리 회수된 스팀의 양만 조절하면 되며, 0~100%의 부하의 변동이 1~3초 내에 조절할 수 있다.If the load is increased accordingly, the steam recovered from the steam turbine generator 50 can be used to generate power to supplement the insufficient power. At this time, unlike the dual fuel engine 10, the load fluctuation tolerance of the steam turbine generator 50 can be adjusted only by the amount of steam recovered, and the variation of the load of 0 to 100% can be controlled within 1 to 3 seconds.

상기와 같은 증기터빈 발전기(50)의 제어는 전력관리부(80)에서 이루어진다. 부하가 증가하여 추가적인 전력이 필요한 경우, 증기터빈 발전기(50)로 공급되는 스팀의 양은 6~8barg가 공급되도록 제어하여, 부족한 전력을 공급할 수 있다.The control of the steam turbine generator 50 is performed in the power management unit 80. When additional power is required due to an increase in load, the amount of steam supplied to the steam turbine generator 50 can be controlled to be 6 to 8 barg to supply insufficient power.

일반적으로, 보조보일러(30)가 100%의 부하로 가동될 때 생산되는 스팀의 양은 6500kg/h이고, 보조보일러(30)의 최소부하는 약 33%이며, 선박의 매뉴버링시 선박 내 스팀의 부족량은 약 400~800kg/h이다. 즉, 스팀 부족량을 충당하기 위해 보조보일러(30)를 운전할 경우 6500＊0.33＝2145kg/h의 스팀을 어쩔 수 없이 생산해야하며, 남은 스팀은 버리게 된다. 그러므로 본 발명의 폐열회수를 이용한 전력생산 시스템(1)은 버려지는 1345~1745kb/h의 스팀을 회수하여 증기터빈 발전기(50)로 공급하여 전력을 생산한다.
Generally, the amount of steam produced when the auxiliary boiler 30 is operated at a load of 100% is 6500 kg / h, the minimum load of the auxiliary boiler 30 is about 33%, and the steam in the ship during maneuvering The deficit is about 400 to 800 kg / h. That is, when the auxiliary boiler 30 is operated to compensate for the deficiency of steam, 6500 * 0.33 = 2145 kg / h of steam is inevitably produced, and the remaining steam is discarded. Therefore, the power generation system 1 using the waste heat recovery of the present invention recovers steam of 1345-1745 kb / h that is discarded and supplies it to the steam turbine generator 50 to produce electric power.

위에서 설명한 바와 같이 본 발명에 대한 구체적인 설명은 첨부된 도면을 참조한 실시예에 의해서 이루어졌지만, 상술한 실시예는 본 발명의 바람직한 예를 들어 설명하였을 뿐이므로, 본 발명이 상기 실시예에만 국한되는 것으로 이해돼서는 안 되며, 본 발명의 권리범위는 후술하는 청구범위 및 그 등가개념으로 이해되어야 할 것이다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It should be understood that the scope of the present invention is to be understood as the scope of the following claims and their equivalents.

1: 전력생산 시스템
10: 이중연료 엔진 20: 이코노마이저
30: 보조보일러 40: 엔진추진 장치
50: 증기터빈 발전기 60: 진공응축기
70: 응축수 이송펌프 80: 전력관리부
BR: 저항수단 PT: 압력감지기
SL: 스팀공급라인1: Power generation system
10: dual fuel engine 20: economizer
30: auxiliary boiler 40: engine propulsion device
50: Steam turbine generator 60: Vacuum condenser
70: Condensate transfer pump 80: Power management unit
BR: Resistance means PT: Pressure sensor
SL: Steam supply line

Claims (12)

가스연료 및 액체연료 중 어느 하나 이상을 연료로 공급받아 구동되는 이중연료 엔진;
상기 이중연료 엔진에서 배출되는 배기가스를 공급받아 상기 배기가스의 폐열을 열원으로 스팀을 생산하는 이코노마이저(Exhaust Gas Economizer, EGE); 및
상기 이코노마이저에서 생산된 스팀의 생산량이 부족할 경우, 액체연료를 공급받아 그 연소열로 스팀을 추가 생산하는 보조보일러(Auxiliary Boiler)를 포함하고,
상기 보조보일러에 의해 생산되는 스팀은 스팀공급라인을 통해 기관실 등의 스팀소모처로 공급되어 선박의 추진동력으로 사용되고,
상기 보조보일러에 의해 최소한으로 생산되는 스팀의 양이 선박의 추진동력으로 사용되는 스팀의 양보다 많아서 남게 되는 스팀을 회수하여 전력을 생산하는 증기터빈 발전기를 더 포함하는 폐열회수를 이용한 전력발생 시스템.A dual fuel engine driven by being supplied with at least one of a gas fuel and a liquid fuel as fuel;
An exhaust gas economizer (EGE) that receives exhaust gas discharged from the dual fuel engine and produces steam by using waste heat of the exhaust gas as a heat source; And
And an auxiliary boiler for supplying the liquid fuel and further producing steam by the combustion heat when the amount of steam produced by the economizer is insufficient,
The steam produced by the auxiliary boiler is supplied to the steam consumption source of the engine room through the steam supply line and is used as the propulsion power of the ship,
And a steam turbine generator for recovering steam remaining after the amount of steam produced as a minimum by the auxiliary boiler exceeds the amount of steam used as a propulsion power of the ship to produce electric power. 청구항 1에 있어서,
상기 이중연료 엔진 및 증기터빈 발전기에서 생산된 에너지를 공급받아 구동되는 엔진추진장치를 더 포함하는 폐열회수를 이용한 전력발생 시스템.The method according to claim 1,
And an engine propulsion device driven by energy generated by the dual fuel engine and the steam turbine generator. 청구항 2에 있어서,
상기 엔진추진장치에 전기적으로 연결되는 저항수단을 더 포함하는 폐열회수를 이용한 전력발생 시스템.The method of claim 2,
Further comprising resistance means electrically connected to the engine propulsion device. 청구항 3에 있어서,
상기 저항수단은 상기 이중연료 엔진이 특정 값보다 낮은 부하로 운전될 때, 상기 이중연료 엔진의 과잉전류를 소모하는 폐열회수를 이용한 전력발생 시스템.The method of claim 3,
Wherein said resistance means utilizes waste heat recovery to consume excess current of said dual fuel engine when said dual fuel engine is operated at a load below a certain value. 청구항 3에 있어서,
상기 저항수단은 브레이킹 레지스터(Breaking Resistors)인 폐열회수를 이용한 전력발생 시스템.The method of claim 3,
Wherein the resistance means is a breaking resistor (Breaking Resistors). 청구항 1에 있어서,
상기 보조보일러에 의해 최소한으로 생산되는 스팀의 양은 2145kg/h이고,
상기 증기터빈 발전기에 의해 회수되는 스팀의 양은 1345~1745kg/h인 것을 특징으로 하는,
폐열회수를 이용한 전력발생 시스템.The method according to claim 1,
The minimum amount of steam produced by the auxiliary boiler is 2145 kg / h,
Characterized in that the amount of steam recovered by said steam turbine generator is between 1345 and 1745 kg / h.
Power generation system using waste heat recovery. 청구항 2에 있어서,
상기 증기터빈 발전기에서 생산되는 전력량을 조절하기 위해 상기 엔진추진장치와 전기적으로 연결되는 전력관리부를 더 포함하는 폐열회수를 이용한 전력발생 시스템.The method of claim 2,
And a power management unit electrically connected to the engine propulsion unit to regulate an amount of power produced by the steam turbine generator. 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100018290A (en) * 2008-08-06 2010-02-17 삼성중공업 주식회사 Ship propulsion unit
KR20120025829A (en) * 2010-09-08 2012-03-16 삼성중공업 주식회사 Ship comprising duel fuel propulsion system
KR20120047805A (en) * 2010-10-27 2012-05-14 컨버팀 테크놀로지 리미티드 Ship with a redundant power supply system shared by the port propeller and the starboard propeller
KR20140024532A (en) 2012-08-20 2014-03-03 현대중공업 주식회사 Waste heat recovery system of the vessel and the method thereof
JP2014076783A (en) * 2012-10-12 2014-05-01 Mitsubishi Heavy Ind Ltd Hull resistance reduction system and hull resistance reduction method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100018290A (en) * 2008-08-06 2010-02-17 삼성중공업 주식회사 Ship propulsion unit
KR20120025829A (en) * 2010-09-08 2012-03-16 삼성중공업 주식회사 Ship comprising duel fuel propulsion system
KR20120047805A (en) * 2010-10-27 2012-05-14 컨버팀 테크놀로지 리미티드 Ship with a redundant power supply system shared by the port propeller and the starboard propeller
KR20140024532A (en) 2012-08-20 2014-03-03 현대중공업 주식회사 Waste heat recovery system of the vessel and the method thereof
JP2014076783A (en) * 2012-10-12 2014-05-01 Mitsubishi Heavy Ind Ltd Hull resistance reduction system and hull resistance reduction method

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