• 기술사
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• 제34권3호
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• pp.28-32
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• 2001

Using the CNG(compressed natural gas) and LPG(liquified petroleum gas) as the automotive fuel will be expanded because of their clean effect to the environmental air qualify. But these programs of gas using expansion would have a difficulty due to public consideration of gas utilities as a big hazard. The Ministry of Environment has an ambitious plan to substitute more than 25,000 buses with CNG and ensure more than 200 CNG refueling stations as well by the year of 2007. However, it is very difficult to establish new CNG and LPG refueling stations because of expanded safety distance than ever before by several major explosion accidents.

• 동력기계공학회지
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• 제12권4호
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• pp.12-17
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• 2008

The purpose of this study is to analyse and compare the fuel combustion characteristics between LPG and gasoline on SI engine. Pressures of combustion chamber were measured on the state that engine speed was 2000rpm and BMEP was 2.0bar And we measured pressures of combustion chamber regarding variation of the MBT We could know that the combustion pressure of LPG fuel use engine is appeared lower than that of gasoline fuel use engine. At the lean mixture ratio area we could blow that Ignition timings are pulled very forward, and ignition timing of LPG fuel is advanced to $5\sim12^{\circ}$ CA than gasoline fuel. We learned that the value of coefficient of variation of LPG fuel is higher than gasoline fuel.

• 한국가스학회지
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• 제22권6호
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• pp.109-122
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• 2018

국내 LPG 미터는 "계량에 관한 법률"에 의거 LPG 정량에 대한 검사가 실시되고 있다. LPG 미터는 "계량에 관한 법률 시행령"에 따라 3년마다 재검정이 실시된다. 검사 시 최대허용오차는 ${\pm}1.0%$ 이내, 사용오차는 ${\pm}1.5%$ 이내이다. 정량 측정 시에는 밀도부액계, 저울, 압력용기를 사용한다. LPG는 온도와 압력에 따라 부피 변화의 정도가 매우 심하다. 현행 정량 측정 방법은 LPG의 부피를 구하기 위해 온도 및 압력, 밀도를 측정해야 하며, 이에 따른 장비들이 필요하다. 반면에 코리올리 질량유량계는 질량유량, 밀도, 온도를 동시에 측정하며, 컴퓨터 프로그램을 사용하여 측정값을 필요한 값으로 변환 및 산출 할 수 있어, 산업현장에서 널리 적용되고 있다. 본 연구에서는 LPG 정량 측정에 대한 기초연구로서, 코리올리 질량유량계를 이용하여 LPG 충전기에서 나온 LPG 부피를 측정했다. 또한, 기존 LPG 충전기 검사방법과의 비교를 통해 코리올리 질량유량계를 이용한 LPG 충전기 검사도 가능하다는 결론을 얻었다.

• 한국산업안전학회:학술대회논문집
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• 한국안전학회 1997년도 춘계 학술논문발표회
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• pp.139-144
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• 1997

지난 30년간의 LPG(Liquified Petroleum Gas)자동차의 사용으로 현재 전국에는 500여 곳의 LPG자동차 충전소가 운영되고 있다. LPG자동차의 운행대수에 비하면 충전소의 수가 절대적으로 부족하고, 또한 LPG자동차의 보급확대를 위해서는 충전소 확충이 필수적이다. 그러나 최근의 아현동 도시가스 밸브기지 폭발사고나 대구 지하철 공사장 도시가스 폭발사고와 같은 대형 가스 폭발사고의 여파로 충전소 설치 부지의 확보에 큰 어려움을 겪고 있다. 특히, 대도시 지역 내에서의 충전소 설치는 인근 지역주민의 강력한 반대로 거의 불가능한 실정이다. (중략)

• 한국자동차공학회논문집
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• 제11권2호
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• pp.63-68
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• 2003

The purpose of this study was to investigate reduction of exhaust gas temperature in LPG conversion engine from diesel. A conventional diesel engine was modified to a LPG(Liquified Petroleum Gas) engine that diesel fuel injection pump was replaced by the LPG fuel system. The research was peformed with measurement of exhaust gas temperature by varying spark ignition timing, air-fuel ratio, compression ratio, EGR ratio and different compositions of butane and propane. The major conclusion of this work were followed. (i) Exhaust gas temperature was decreased and power was increased with the advanced spark ignition timing. (ii) Exhaust gas temperature was decreased with lean and rich air-fuel ratio. (iii)Exhaust gas temperature was decreased and power was increased with the higher compression ratio. (iv) Engine power and exhaust temperature were not influenced by varied butane/propane fuel compositions. (v) Finally, one of the important parameters in reduction of exhaust gas temperature is spark ignition timing among the parameters in this study.

• 한국분무공학회지
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• 제27권2호
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• pp.94-100
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• 2022

Even in non-road UTV (Utility Terrain Vehicle), spark ignition engines are often used to reduce emissions. In this study, gasoline and LPG (Liquified Petroleum Gas) fuels were applied to UTV engines, and the exhaust gas and combustion stability were compared through engine tests. A 0.8-liter two-cylinder SI engine was used in the experiment. Experiments were conducted while changing the IVO (Intake Valve Open) and EVC (Exhaust Valve Close) at 1500 rpm 14 N·m, 40 N·m, and 3000 rpm 17 N·m, 44 N·m conditions. As a result of the experiment, when the valve overlap increased according to the change of IVO and EVC, combustion stability decreased and THC emission increased, but NOx decreased. Comparing the LPG engine with the gasoline engine, the amount of CO₂ and PN (Particulate Number) generation decreased in the LPG engine, and the combustion stability was good.

• 한국자동차공학회논문집
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• 제6권1호
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• pp.108-121
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• 1998

Using gas chromatography, the light hydrocarbon emissions were analyzed from SI engine fueled with methane and liquified petroleum gas(LPG), and the effects of fuel and engine operating condition were discussed. For this purpose, 14 species of light hydrocarbon including 1, 3-butadiene were separated, calibrated with standard gas, and measured from undiluted emissions. The brake specific hydrocarbon emission(BSHC) and ozone forming potential(BSO)3 were calculated and discussed with the changes of fuel, engine speed, load, fuel/air equivalence ratio, coolant temperature, and spark timing. As a result, exhaust emission was composed of mainly fuel composed of mainly fuel comp- onent and other olefin components of similar carbon number. The olefin components such as ethylene and propylene determine most of the ozone forming potential. The fraction of fuel component in total hydrocarbon emission was bigger with methane fuel than with LPG fuel. Also fuel fraction increased at high speed or high speed or high temperature of exhaust gas, and to lesser extent with high coolant temperature and retarded spark. However, the effect of equivalence ratio had different tendency according to fuels.

• 한국가스학회지
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• 제5권4호
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• pp.40-48
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• 2001

본 연구에서는 LPG 충전소에 대하여 Fussel-Vesely 중요도와 RDF 및 RIF 중요도를 수행하여 위험성 등급(Risk Rank)을 설정하였다 설정된 위험성 등급에서 위험성이 가장 큰 장치 및 설비에 대하여 정량적 위험성 분석을 수행하였다. LPG 충전소에 대한 중요도 분석결과 외부사고가 가장 위험하다고 확인되었으며, ekda 으로 구조물 결함과 파이프 배관의 부식의 위험등급이 높았다. 정량적 위험성 분석 결과로는 LPG 충전소 저장탱크의 완전히 파열하였을 경우에 대한 BLEVE의 경가 발생하였을 경우에 복사열에 의해 공정 설비에 손해를 입히기에 충분한 거리는 46.3m로 분석되었다.

• 한국분무공학회지
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• 제16권3호
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• pp.146-151
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• 2011

LPG(Liquified Petroleum Gas) fuel for vehicles has lots of advantages such as low emission level, cheaper fuel cost and enough infrastructure. Therefore it arouses interest as an alternative engine to reduce emission of diesel engines. Especially MPI(Multi Point Injection) type LPLi(Liquid Phase LPG injection) system could have overcome the disadvantages of mixer types such as low engine performance, decreased charging efficiency and cold starting difficulty. However ice formation on the nozzle tip and intake port due to the freezing of moisture around the components is often observed in LPLi systems. This icing phenomenon is the direct cause of unstable engine combustion, resulting in engine emissions. Therefore in this research, a spray visualization test for LPG injection was carried out to obtain the basic information of an LPLi injector, then the effects of butane and propane mixing rates on ice formation at the intake port and nozzle tip was investigated. As a result, the icing characteristics of them showed contrary results according to the mixing rates.

• 공업화학
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• 제20권4호
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• pp.355-362
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• 2009

석유를 기반으로 한 연료는 가까운 미래에 고갈될 것이다. 디메틸에테르(Di-methyl Ether, DME)는 청정에너지이며 천연가스,석탄 및 바이오매스 등으로 생산이 가능하다.DME는 분자구조 내에 탄소-탄소 결합이 없는 함산소 연료로 연소시 그을음과 황산화물을 발생하지 않으며, 물리적 특성이 액화석유가스(Liquified Petroleum Gas, LPG)와 매우 유사하여 LPG 유통인프라를 그대로 활용할 수 있다. DME는 세탄값이 55~60 정도로 높아 디젤 자동차용 연료로도 활용이 가능하다.차세대 청정연료로 혹은 차세대 화학공업 원료물질로 전력생산,디젤 연료, 가정용 연료 및 연료전지 등에 사용이 가능하다.본 총설에서는DME의 특성, 표준화, 국내외의 기술개발현황, 대체연료로서의 활용에 대해 살펴보고자 한다.