• Journal of the Korean Institute of Gas
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• v.21 no.5
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• pp.9-15
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• 2017

Natural gas fuel has known to be very promising in terms of abundancy and economic value. Therefore it is widely treated as research topics in a variety field of production, storage and utilization. Natural gas has become one of the major sources for the power generation by using internal combustion engines(ICE). Development of natural gas fuel injection device should be preceded to realize a reliable natural gas fuel supply system for a MW class power generation reciprocating ICE. In this research, an injection valve which consists of solenoid and body part with a moving plate was designed and its dynamic performance was experimented in the engine-like environment. Displacement length and diameter of an armature and diameter of a solenoid coil were tested at former study. In this research the effect of materials of solenoid core, size of main housing inlet and supply gas pressure are examined.

• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.189.2-189.2
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• 2011

매립가스(LFG)는 약 50v/v% 이상의 메탄가스로 이루어져 있어 LFG의 자원화 사업은 국내 신 재생에너지를 이용한 발전사업 중 태양광사업 다음으로 활발히 진행되고 있다. LFG의 대표적인 활용기술로는 가스엔진, 가스터빈 및 증기터빈을 이용한 발전과 중질가스 및 고질가스 형태의 연료로 생산하는 방식 등이 있으며 이러한 분야에 매립지가스를 적용하기 위해서는 장치 부식의 주 원인이 되는 황화수소 가스의 제거가 반드시 이루어져야 한다. 본 연구에서는 황화수소 제거를 위해 하이드레이트와 마찬가지로 동공을 형성하여 가스의 포집과 저장이 가능한 하이드로퀴논(HQ)을 이용하고자 한다. HQ은 $0^{\circ}C$ 부근에서 해리되는 하이드레이트와 달리 상온에서 고체 형태로 구조를 유지할 수 있어 가스의 포집 및 저장에 용이한 장점이 있다. 메탄, 이산화탄소, 황화수소 혼합가스에서 황화수소 90% 이상 제거를 목적으로 HQ와 반응시켜 동공 내에 이들 가스의 포집여부를 확인하였다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1108_1109
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• 2009

본 논문은 계통연계형 열병합 발전의 동작특성을 시뮬레이션을 통해 분석하는데 목적이 있다. 계통연계형 열병합 발전은 가스엔진, 영구자석형 동기발전기, 전력변환기로 구성되어 있는 것을 모델링하였다. 본 연구에서는 가스엔진이 일정속도로 동작하고 다극형 영구자석형 발전기에서 생산되는 400Hz 출력을 컨버터와 인버터로 구성되어 있는 전력변환기를 통해 상용주파수의 교류로 전력계통과 연계하는 것을 모의 하였다. 시뮬레이션은 PSCAD/EMTDC 프로그램을 이용하였고 시뮬레이션모델을 통해 다양한 시뮬레이션을 수행하였다. 그리고 실제모델의 축소 모형을 설계하여 하드웨어 시뮬레이터를 제작하였다.

• Proceedings of the KIEE Conference
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• 2008.10c
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• pp.164-166
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• 2008

본 논문은 계통연계형 열병합발전의 동작특성을 모의하는 시뮬레이션모델에 관해 기술하고 있다. 계통연계형 열병합발전은 가스엔진, 영구자석발전기, 전력변환기로 구성되어 있는데 본 연구에서는 가스엔진은 일정출력을 공급하고 다극형 영구자석발전기에서 생산되는 400Hz 출력을 컨버터와 인버터를 통하여 상용주파수의 교류로 전력계통과 연계하는 것으로 가정하였다 개발된 시뮬레이션모델은 PSCAD/EMTDC를 이용하였고 전력회로는 내장모듈을 그리고 제어기는 C 프로그램으로 직접 개발하였다. 개발된 PSCAD/EMTDC 시뮬레이션모델을 이용한 다양한 시뮬레이션을 실시하여 하드웨어 시뮬레이터를 설계하였다.

• Journal of the Korean Institute of Gas
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• v.20 no.6
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• pp.43-49
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• 2016

In this paper, purpose of study is emissions characteristics according to effects of heating value variations of CNG fuel in a dual-fuel engine fueled by diesel and natural gas. For heating value variation of CNG fuel, nitrogen gas was mixed with pure CNG fuel. So the higher heating value was changed from $10,400kcal/Nm^3$ to $9,400kcal/Nm^3$. Under one condition of CNG substitution rate was fixed at 80%, diesel fuel was injected at a fixed injection timing of 16 CAD BTDC and fuel pressure was also fixed at 110 MPa. The condition of tested engine was 1800 rpm and 500Nm. Emissions were sampled in exhaust pipe was located at downstream turbocharger. As a result, emissions characteristics were checked in heating value variations of CNG fuel with mixed nitrogen gas THC, $CH_4$ and CO emissions decreased and NOx and $CO_2$ increased.

• Plant Journal
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• v.7 no.1
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• pp.4-12
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• 2011

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.800-803
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• 2007

Gasification has been regarded as a core technology in dealing with environmental pollutants and in obtaining higher efficiency for power generation. Among several ways in utilizing produced syngas from gasification, power generation would be the most prominent application. Syngas from coal was applied to the readily available LPG engine from automobiles. Main purpose was to identify the combustion characteristics in the modified gas engine when using syngas of low heating value and to test the modification optionsin the LPG gas engine. Gas engine rpm and the corresponding flue gas composition were measured for each syngas input condition. Results showed that even with syngas at the heating value of $1300{\sim}1800$ kcal/$Nm^3$ corresponding to the $6{\sim}7%$ of LPG heating value, gas engine operated successfully only with the problems of high CO and oxygen concentrations in the flue gas.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.39 no.2
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• pp.153-159
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• 2015

In this study, a 2-W micro-gas turbine engine was designed using micro-electro-mechanical systems (MEMS) technology, and analytical and experimental investigations of its potential under actual combustion conditions were performed. An ultra-micro-gas turbine contains a turbo-charger, combustor, and generator. A compressor, turbine blade, and generator coil were manufactured using MEMS technology. The shaft was supported by a precision computer numerical control machined air bearing, and a permanent magnet was attached to the end of the shaft for generation. An analysis found that the cooling effect of the air bearing and compressor was sufficient to cover the combustor heat, which was verified in an actual experiment.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2009.05a
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• pp.354-358
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• 2009

Micro gas turbine engine is well known as a power plant of unmanned aerial vehicle and a small scale emergency generation system and also, it is significant as initial research of large gas turbine and educational purpose of gas turbine. Many sort of Micro gas turbine test set for education is produced by several manufacturers, but all of the engine control system of them is separated with data acquisition system; moreover, the engine control algorithms are inaccessible and related variables could not be collected. In this investigation, the Integrated Modifiable Test Rig which has modifiable engine start-up, drive and situational control logics is developed by LabVIEW with I/O devices and it provides wide experimental applicability to studies of dynamic characteristics of fuel system and combustion instability.

• Journal of Energy Engineering
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• v.26 no.2
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• pp.32-38
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• 2017

The common rail diesel engine used in this study uses mechanically driven camshaft for the operation of intake and exhaust valves, and the timing of valve opening and closing is fixed according to the operating conditions of the vehicle. However, the electric generator engine operates at a constant speed and partial load. Therefore, in order to optimize the design of common rail diesel engine for power generation, the characteristics of diesel combustion and emissions according to the change of valve timing were examined and calculated in terms of fuel economy. The valve timing of the diesel engine influenced the combustion characteristics by changing the intake and exhaust flow and it was considered that the fuel efficiency of the generator could be improved.