• 제목/요약/키워드: Natural Gas

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디젤연소용기에 직접분사된 천연가스와 파일럿오일의 복합연소 모델링 (Modeling the Dual-Fuel Combustion of Natural Gas and Pilot Distillate Injected Directly into a Diesel Combustion Bomb)

  • 최인수
    • 한국자동차공학회논문집
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    • 제4권1호
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    • pp.155-164
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    • 1996
  • Dual-fuel engines are being researched with emphasis on the possible types of natural gas supply systems. Hence, a three-dimensional combustion model by using finite volume method was developed to provide a fundamental understanding of the auto-ignition of pilot distillate and subsequent burning of natural gas, when the natural gas as well as the distillate was directly injected into a quiescent diesel engine like combustion bomb tests and the numerical results were investigated for the mixed combustion phenomena. With high-pressure natural gas injection, it was found that the gaseous fuel injection characteristics had to be well harmonised with that of the pilot distillate. For better combustion efficiency, however, further researches are required for the optimisation of injection system in the existence of air motion.

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천연가스가 예혼합된 정적연소실에 파일럿오일을 분사한 복합연소현상 (Dual-Fuel Combustion Phenomena of Pilot Distillate Injected to Pre-mixed Natural Gas in a Constant Volume Combustion Bomb)

  • 최인수
    • 한국자동차공학회논문집
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    • 제3권6호
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    • pp.112-122
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    • 1995
  • As an alternative fuel producing less exhaust emissions, natural gas is of interest for use both in SI and CI engines. The potential of natural gas fuelled dual-fuel engine is considered high enough. However, much effort has to be made so that gaseous fuel is used efficiently with simultaneous minimum use of pilot oil. Hence, a simplified three-dimensional model, using a finite volume method in cylindrical coordinates, has been developed to facilitate an understanding of the dual-fuel combustion phenomena and to predict the complex interactions between the pilot distillate and natural gas. The computer model was calibrated by comparing it with the experimental results obtained from diesel engine like combustion bomb tests. In the pre-mixed natural gas combustion, the fuel burning was highly reliant on the injection condition and subsequent burning nature of the pilot distillate.

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천연가스 고체수송 및 저장을 위한 가스 하이드레이트 상평형 조건에 대한 연구 (Phase Equilibrium Conditions of Gas Hydrates for Natural Gas Solid Transportation and Storage)

  • 전용한;김종윤;김종보;김남진
    • 설비공학논문집
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    • 제20권4호
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    • pp.266-273
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    • 2008
  • Natural gas hydrates are ice-like solid substances, which are composed of water and natural gas, mainly methane. They have three kinds of crystal structures of five polyhedra formed by hydrogen-bonded water molecules, and are stable at high pressures and low temperatures. They contain large amounts of organic carbon and widely occur in deep oceans and permafrost regions. Therefore, they are expected as a potential energy resource in the future. Especially, $1m^3$ natural gas hydrate contains up to $172Nm^3$ of methane gas, de pending on the pressure and temperature of production. Such large volumes make natural gas hydrates can be used to store and transport natural gas. In this study, three-phase equilibrium conditions for forming natural gas hydrate were numerically obtained in pure water and single electrolyte solution containing 3 wt% NaCl. The results show that the predictions match the previous experimental values very well, and it was found that NaCl acts as an inhibitor. Also, help gases such that ethane, propane, i-butane, and n-butane reduce the hydrate formation pressure at the same temperature.

가스냉방의 경제성 분석 (An Economic Analysis of the Natural Gas Air-conditioning)

  • 김봉진;박연홍
    • 산업공학
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    • 제11권1호
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    • pp.207-214
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    • 1998
  • Since the natural gas air-conditioning not only increases the base load of the gas company but also decreases the summer peak load of the electricity company, it is considerded as an efficient demand-side management program. This paper suggests the economic evaluation method of the gas air-conditioning program from the perspectives of the participants, the pipeline gas company, the local distribution company, the electricity company, and the total resources. The absorption type gas air-conditioning/space-heating is selected as a case study to illustrate the economic analysis of the natural gas air-conditioning.

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Comprehensive energy analysis of natural gas transportation in molecules or in electricity

  • Udaeta, Miguel E.M.;Rigolin, Pascoal H.C.;Burani, Geraldo F.;Galvao, Luiz C.R.
    • Advances in Energy Research
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    • 제2권2호
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    • pp.61-72
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    • 2014
  • This paper's aim is to do a global evaluation (considering four dimensions: technical-economic, environmental, social and political) in the ways of natural gas transportation (gas pipelines, GNL and GTL) and electric transmission, in order to supply the energy demands of Mato Grosso do Sul, a brazilian state. The transport ways had been compared between itself using a software of decision taking (Decision Lens Suite), which determined a better way for transporting natural gas in this case. In a generalized manner the gas pipeline is the best way of transporting natural gas, therefore it takes advantage in the majority of the analyzed dimensions.

Effects of Gas Composition on the Performance and Emissions of Compressed Natural Gas Engines

  • Min, Byung-Hyouk;Chung, Jin-Taek;Kim, Ho-Young;Park, Simsoo
    • Journal of Mechanical Science and Technology
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    • 제16권2호
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    • pp.219-226
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    • 2002
  • Natural gas is considered to be a promising alternative fuel for passenger cars, truck transportation and stationary engines providing positive effects both on the environment and energy security. However, since the composition of natural gas fuel varies with location, climate and other factors, it is anticipated that such changes in fuel properties will affect emission characteristics and performance of CNG (Compressed Natural Gas) engines. The purpose of the present study is to investigate the effects of the difference in gas composition on the engine performance and emission characteristics. The results show that THC (Total Hydrocarbon) decreases with increasing Wl (Wobbe Index) and MCP (Maximum Combustion Potential). On the other hand, it is observed that NOx slightly increases as Wl and MCP increase. The TLHV (Total Lower Heating Value of Intake) is proposed in this study as a potential index for compatibility of gas fuels in a CNG engine. There is a variation in power up to 20% depending on the composition of gas when the A/F ratio and spark timing are flexed for a specific gas fuel.

알루미늄 실린더에서 혼합 탄화수소(C6-C10) 표준가스 개발 (Development of standard gas mixtures of hydrocarbons in methane contained in aluminum cylinders)

  • 김용두;배현길;우진춘;이상일;오상협;이진홍
    • 분석과학
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    • 제30권5호
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    • pp.287-294
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    • 2017
  • 천연가스는 산업의 발전으로 인하여 수요가 계속 증가하고 있어 도입물량 부족 현상이 일어나 수급이 점차 불안정해질 것으로 예상된다. 액화천연가스 외에 파이프라인 천연가스 및 대체 천연가스등 다양한 형태의 가스 도입과 개발로 수요를 충당해야 할 필요성이 있다. 도입된 PNG의 성분과 농도를 정확하게 측정해야 한다. 이에 따른 천연가스 내에 있는 미량 성분인 탄화수소류($C_6-C_{10}$)의 정확한 측정이 요구되어 표준가스의 개발이 필수적이다. 이 연구에서 개발한 일차 표준물질에 대한 조성과 농도는 $10-30{\mu}mol/mol$의 헥산, 헵탄, 옥탄, 노난, 데칸이며 바탕가스는 메탄이다. 탄화수소류($C_6-C_{10}$)의 표준가스 제조는 각 성분 원료가스에 대한 순도분석이 완료된 가스를 ISO 6142에 근거하여 소급성이 있는 중량법으로 알루미늄 실린더에 제조하였다. 제조된 표준가스는 분석기로 표준가스간의 제조일치성, 실린더의 흡착성, 안정성 변화 및 불확도 평가를 하였다. 결과는 알루미늄 실린더에서 내부표면의 흡착 손실이 적고 장기 안정성이 매우 우수하다는 것을 알 수 있었고, 헥산, 헵탄, 옥탄, 노난, 데칸의 농도 $10-30{\mu}mol/mol$ 수준에서 불확도 0.79-1.63 %이내의 표준가스를 개발하였다.

천연가스 수송용 API 5L-X42 강관의 용접방법에따른 용접부의 미세조직과 기계적 특성에 관한 연구 (A Study on the Microstructure and Mechanical Properties for the Weldment with Variation of Welding Process of the API 5L-B42 Pipeline for Natural Gas Transmission)

  • 백종현;김철만;김영표;김우식
    • 한국가스학회:학술대회논문집
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    • 한국가스학회 1997년도 추계학술발표회 논문집
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    • pp.33-38
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    • 1997
  • Demand of the clean and convenient natural gas has continuously increased with recognizing of the environment problem since liquefied natural gas was introduced in Korea. Clean fuel natural gas was supplied to each city through high tensile strength pipeline connected by welding. Grades of pipeline were divided into the high and middle pressure according to supply pressure. Pipeline was welded mainly SMA welding process due to its easy handling, the other welding process was adopted according to the constructing condition. We were examined on the microstructure variation and mechanical properties of weld metal for high pressure pipeline, API 5L X-42.

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천연가스 다노즐 열원설비의 연료 유동 안정화 (Stabilization of Fuel F1ow in a Multi-Nozzle Combustion System Burning Natural Gas)

  • 박의철;차동진
    • 설비공학논문집
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    • 제13권12호
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    • pp.1255-1265
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    • 2001
  • A numerical study has been conducted to characterize the transient flow in a utility gas turbine burning natural gas. The solution domain encompasses the supply gas pressure regulator to the combustor of the gas turbine that employs multi-nozzle fuel injectors. Some results produced for verification in the present study agree suite well with the experimental ones. It is found that the total gas flow may decrease noticeably during its combustion mode change, which would be the reason of momentary combustion upset, when a reference case of opening ratios of control valves in the system is applied. Several parameters are then varied in order to make the total gas flow stable over that period of time. Results of this study may be useful to understand the unsteady behavior of combustion system burning natural gas.

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내연기관엔진의 가스혼소발전 경제성 예측모델 개발 (Development of Economic Prediction Model for Internal Combustion Engine by Dual Fuel Generation)

  • 허광범;장혁준;이형원
    • 한국수소및신에너지학회논문집
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    • 제31권4호
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    • pp.380-386
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    • 2020
  • This paper represents an analysis of the economic impact of firing natural gas/diesel and natural gas/by-product oil mixtures in diesel engine power plants. The objects of analysis is a power plant with electricity generation capacity (300 kW). Using performance data of original diesel engines, the fuel consumption characteristics of the duel fuel engines were simulated. Then, economic assessment was carried out using the performance data and the net present value method. A special focus was given to the evaluation of fuel cost saving when firing natural gas/diesel and natural gas/by-product oil mixtures instead of the pure diesel firing case. Analyses were performed by assuming fuel price changes in the market as well as by using current prices. The analysis results showed that co-firing of natural gas/diesel and natural gas/by-product oil would provide considerable fuel cost saving, leading to meaningful economic benefits.