• Title/Summary/Keyword: Natural Gas Engine

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A Study on Commercialization Feasibility of HCNG Engine in Emissions Characteristics (HCNG 엔진의 배출가스 특성에 따른 상용화 타당성 연구)

  • Park, Cheolwoong;Kim, Changgi;Choi, Young;Lee, Janghee
    • Journal of the Korean Institute of Gas
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    • v.17 no.1
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    • pp.1-6
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    • 2013
  • Using natural gas-hydrogen blended fuel (HCNG) in a heavy duty vehicle is regarded as an alternative to meet reinforced emission regulation compared to a recent direct injection (DI) diesel engine. Hydrogen can lead stable lean combustion even under leaner mixture condition than natural gas, so that improving not only thermal efficiency but also $NO_x$ emissions. In the present study, the feasibility of HCNG engine's commercialization was accessed with HCNG fuel (30% $H_2$ and 70% natural gas) in aspect to the reliability and possibility to reduce $NO_x$ emissions by the level of EURO-VI under various operating conditions.

Performance and Emission Characteristics of a CNG Engine Under Different Natural Gas Compositions (천연가스 조성 변화에 따른 CNG 엔진 성능 및 배기가스 특성)

  • Ha, Young-Cheol;Lee, Seong-Min;Kim, Bong-Gyu;Lee, Chang-Jun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.7
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    • pp.749-755
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    • 2011
  • The performance and emission characteristics of a CNG (compressed natural gas) engine were experimentally investigated under different natural gas compositions. The engine specifications were as follows: 6606 cc, turbo, lean-burn-type; its ignition timing was fixed for the fuel gas with a HHV (higher heating value) of 10454 kcal/$Nm^3$. The experimental results showed that when the HHV of the fuel gas was changed from 10454 kcal/$Nm^3$ to 9811 kcal/$Nm^3$ and 9523 kcal/$Nm^3$, the average power reductions were 3.2 % and 3.4 % (1.5 % and 2.1 %, respectively, with A/F control switched off), respectively, and the average thermal-efficiency reductions were 1.1 % and 1.5 % (1.5 % and 2.1%, respectively, with A/F control switched off), respectively. The emissions of $CO_2$, CO, and $NO_x$ decreased as the HHV of the fuel gas was lowered. On the other hand, the emissions of THC (total hydrocarbon) were not consistent, and the extent of change in their emissions was small.

An Engine Model of a Heavy-Duty Compressed Natural Gas Engine for Design of an Air-Fuel Ratio Controller (대형천연가스차량의 공연비제어기 설계를 위한 엔진모델)

  • 심한섭;이태연
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.12 no.5
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    • pp.80-87
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    • 2003
  • Air partial pressure ratio and inlet air mass flow are influenced by water vapor and gaseous fuel in mixture on Compressed Natural Gas (CNG) engines. In this paper, the effects of the water vapor and the gaseous fuel that change the air mass flow and the air-fuel ratio are studied. Effective air mass ratio is defined as the air mass flow divided by mixture mass flow, and also it is applied to the estimation of the inlet air mass flow and the air-fuel ratio. The presence of the gaseous fuel and the water vapor in the mixture reduces the air partial pressure and the effective air mass ratio of the CNG engines. The experimental results for the CNG engine show that estimation of the air-fuel ratio based upon the effective air mass ratio is more accurate than that of a normal mode.

천연가스 Dual Fuel기관의 성능과 배출가스 개선을 위한 수소혼합 실험

  • ;;Masahiro Shioji
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1999.05a
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    • pp.95-100
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    • 1999
  • One of the unsolved problems of the natural gas dual fuel engine is that there is too much exhaust of Total Hydrogen Carbon(THC) at a low equivalent mixture ratio. To fix it, a natural gas mixed with hydrohen was applied to engine test. The results showed that the higher the mixture ratio of hydrogen to natural gas, the higher the combustion efficiency. And when the amount of the intake air is reached to 90% of WOT, the combustion efficiency was promoted. But, like a case making the injection timing earlier, the equivalent mixture ratio for the nocking limit decreases and the produce of NOx increases.

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A Study on Emission Reductions of Diesel Engine Using Plasmatron Fuel Converter (플라즈마트론을 이용한 디젤 엔진의 매연저감에 관한 연구)

  • Ki, Ho-Beom;Kim, Bong-Soo;Kwak, Yong-Hwan;Kim, Woo-Hyung;Lim, Won-Kyung;Chae, Jae-Ou
    • 한국연소학회:학술대회논문집
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    • 2006.10a
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    • pp.104-109
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    • 2006
  • Improvements in internal combustion engine and aftertreatment technologies are needed to meet future environmental quality goals. Plasmatron fuel converters provide a rapid response, compact means to transform a wide range of hydrocarbon fuels (including gasoline, natural gas and diesel fuel) into hydrogen-rich gas. Hydrogen-rich gas can be used as an additive to provide NOx reductions of more than 80% in diesel engine vehicles by enabling very lean operation or heavy exhaust engine recirculation. For diesel engines, use of compact plasmatron reformers to produce hydrogen-rich gas for the regeneration of NOx absorber/absorbers and particulate traps for diesel engine exhaust after-treatment could provide significant advantages. Recent tests of conversion of diesel fuel to hydrogen-rich gas using a low current plasmatron fuel converter with non-equilibrium plasma features are described.

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Designing isolation system for Engine/Compressor Assembly of GAS Driven Heat Pump (가스 엔진 구동 열펌프 실외기 엔진/압축기 진동 절연 설계)

  • Lenchine Valeri V.;Ko, Hong-Seok;Joo, Jae-Man;Oh, Sang-Kyoung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.05a
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    • pp.1128-1133
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    • 2003
  • A gas driven heat pump (GHP) core design comprises internal combustion engine, compressors incorporated to a cooling/heating system, rubber mountings and belt transmissions. Main excitation farces are generated by an engine, compressors themselves and belt fluctuation. It leads to high vibration level of the mount that can cause damage of GHP elements. Therefore an appropriate design of the mounting system is crucial in terms of reliability and vibration reduction. In this paper oscillation of the engine mount is explored both experimentally and analytically. Experimental analysis of natural frequencies and operational frequency response of the GHP engine mounting system enables to create simplified model for numerical and analytical investigations. It is worked out criteria f3r vibration abatement of the isolated structure. Influence of bracket stiffness between engine and compressors, suspension locations and damper performance is investigated. Ways to reduce excitation forces and improve dynamic performance of the engine-compressor mounting system are considered from these analyses. Implementation of the proposed approach permits to choose appropriate rubber mountings and their location as well as joining elements design A phase matching technique can be employed to control forces from main exciters. It enables to changing vibration response of the structure by control of natural modes contribution. Proposed changes lead to significant vibration reduction and can be easily utilized in engineering practice.

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Analysis on Performance and Emission with Different Diesel Injection Methods in a Dual-Fuel Engine (디젤 분사방식에 따른 이종연료 엔진의 성능 및 배기 분석)

  • Park, Hyunwook;Lee, Junsun;Oh, Seungmook;Kim, Changup;Lee, Yonggyu;Jang, Hyungjoon
    • Journal of ILASS-Korea
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    • v.27 no.2
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    • pp.101-108
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    • 2022
  • Performance and emissions with different diesel injection methods were analyzed in a natural gas-diesel, dual-fuel engine under low-load conditions. Natural gas was supplied to intake port during the intake stoke to form a natural gas-air premixed mixture for all methods. Diesel was injected directly into the cylinder during the compression stroke in three ways: early injections, late injections, and a combination of early and late injections. The early injections had the highest thermal efficiency among the three methods owing to its highest combustion efficiency. The wide dispersion of diesel before the combustion initiation also allowed superior emissions characteristics.

Performance characteristics of CNG engine at various compression ratios (압축비 변경에 따른 CNG기관의 성능특성 연구)

  • 김봉석;이영재;고창조
    • Journal of the korean Society of Automotive Engineers
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    • v.13 no.3
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    • pp.49-57
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    • 1991
  • Natural gas is one of the most promising alternative fuels for automative vehicles, because it has lower exhaust emissions and better fuel economy characteristics than gasoline and can be used in conventional engines with a little modification. In the present study, a conventional gasoline engine was modified to a CNG dedicated engine, which can be operated with CNG( compressed natural gas) only, and a engine bench test was performed at various compression ratios. As a result, it was revealed that the prototype CNG engine can be operated with lower exhaust emissions, better fuel economy and better thermal efficiency, but with a sightly reduced brake horse power, compared to the conventional gasoline engine.

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A Comparative Study on the Performance and Emission Analysis of a Dual Fuelled Diesel Engine with Karanja Biodiesel and Natural Gas

  • Singh, Ashish Kumar;Kumar, Naveen;Amardeep, Amardeep;Kumar, Parvesh
    • International Journal of Advanced Culture Technology
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    • v.4 no.1
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    • pp.10-18
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    • 2016
  • In the present study, a single cylinder four stroke dual fuel diesel engine was tested to investigate the performance and emission characteristics of various test fuels. The engine was tested in dual fuel mode using diesel and Karanja biodiesel blends as pilot fuel along with Natural gas as primary fuel with a constant gas flow rate under different loading conditions. From the experimentation it was found that smoke opacity and oxides of nitrogen (NOx) are at low level for all the prepared test fuels in dual fuel mode but the emissions of carbon monoxide (CO), carbon dioxide ($CO_2$) and hydrocarbon (HC) were found higher. In comparison to diesel fuel, by increasing the blend percentage different emission parameters are found to be reduced. At different loading conditions all the test fuels show poor performance in dual fuel mode of operation when compared with single mode of operation with diesel and biodiesel. With increase in gas flow rates, except (NOx) and smoke emissions, the other emission parameters like CO, HC and $CO_2$ values increased for all test fuels. Again, all blended fuels showed lower performance compared to diesel. The maximum pilot fuel savings for diesel was found decreasing with the increase in karanja biodiesel. From the present work it may be concluded that Karanja biodiesel with Natural gas in dual mode can be can used as promising alternative for diesel with some required engine modifications and further research must be carried out to minimize the emissions of CO, HC and $CO_2$.

Present Status and Further Development of Performances of Industrial Gas Turbine Engine Turbogreen 1200

  • Min, Daiki;Bograd, Alexander M.
    • 유체기계공업학회:학술대회논문집
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    • 1998.12a
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    • pp.191-197
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    • 1998
  • The recent results of the engine development performed in this you on Turbogreen 1200, the first industrial gas turbine engine developed in Korea, are presented. In order to improve the engine performance and structural stability from the first prototype engine, several variants of the engine and major components such as combustor and rotor assembly have been developed and tested. This paper shows these results especially focused on the engine test and performance analysis, in which test system, instrumentation and data processing are discussed as well. The engine performance and its trend give relatively good coincidence with the design ones. At design power of 1.2MW, the thermal efficiency of the engine is estimated over $25\%$ which is below the design target of $27.2\%$. This gap of efficiency is caused mainly by large tip clearance between turbine blades and casing. Considering high design efficiency superior to those of other competitive engines in this power class, Turbogreen 1200 would have a strong competition in its performance if the design efficiency is achieved by further developments such as tip clearance control, which are very possible and natural in final mass production of the developed gas turbine engine.

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