• Title/Summary/Keyword: 연료량 측정장치

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Flmae Visualization of the sector combustor (분할연소기의 화염 가시화 연구)

  • Kim, Bo-Ra-Mi;Choi, Chea-Hong;Kim, Chun-Taek;Choi, Seong-Man
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.11a
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    • pp.213-216
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    • 2009
  • In order to see the flame behavior in the gas turbine combustor, combustion test was performed by using sector combustor. Ignition test with torch ignition system was carried out at the various combustor inlet velocity and air fuel ratio. Also, flame blow out limit was measured by changing fuel flow rate with fixed air mass flow rate. In the test results, stable ignition is possible at air excess ratio of 6 and this limit is gradually increased with combustor inlet air velocity. The minimum blow out limit is about 4 at 40 m/s of combustor inlet velocity. This blow out limit is also increased up to about 10 with increasing combustor inlet velocity.

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A Study on Performance Change of Gas Injector with Ambient Temperature Environment (주변 온도환경 변화에 따른 가스 인젝터 성능 변화에 대한 연구)

  • Kim, Ji-Yoon;Yang, Jeong-Jik;Kim, Jin-Ho;Seo, Ii-Won;Lim, Jong-Wan
    • Journal of the Korean Institute of Gas
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    • v.22 no.5
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    • pp.18-23
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    • 2018
  • This study tries to analyze the injection amount of injector according to the external environment temperature of CNG vehicle. Especially, We investigated the effect of low temperature environment on gas injector performance by measuring the variation of injection amount under the same conditions as in coldstart condition. This experimental compared two products with different spring characteristics. The experimental device consist of a fuel supply unit, a flowrate measurement unit, a temperature chamber, and an injector control unit (ECU). According to the test result, the initial injection amount of the injector is increased in the low temperature environment and the needle opening time is delayed according to the change of the spring length.

Effect of fuel injection timing and pressure on the combustion and spray behavior characteristics of diesel fuel for naval vessel (연료분사시기와 압력이 함정용 디젤연료의 분무 및 연소특성에 미치는 영향)

  • Lee, Hyung-min
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.9
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    • pp.911-917
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    • 2015
  • The objective of this work focuses on the analysis of injection rate and macroscopic spray behavior characteristics with injection pressures as well as combustion and exhaust emission characteristics with injection timing and injection pressure by using a common rail single-cylinder diesel engine. The injection rate was measured by applying the Bosch method, and macroscopic spray behavior characteristics were analyzed with a constant-volume vessel and a high-speed camera. In addition, combustion and emission characteristics were analyzed in a common-rail single-cylinder diesel engine with precise control of fuel injection timing and pressure. For injection pressures of 30MPa and 50MPa, the injection rate was higher at 50 MPa, and the spray development (penetration) was also higher in the same elapsed time. The peak in-cylinder pressure and rate of heat release showed a tendency to decline as injection timing was delayed, and the peak in-cylinder pressure and rate of heat release were slightly higher for higher injection pressures. Higher injection pressures also reduced the mean effective pressure, while the indicated mean effective pressure and torque increased as injection timing was delayed to TDC. Nitrogen oxides had a peak level at injection timings of $BTDC20^{\circ}$(30MPa) and $BTDC15^{\circ}$(50MPa); carbon monoxide emissions were reduced by delaying injection timing from $BTDC30^{\circ}$.

Study of Failure Examples for Emission Gas Control System in Gasoline Engine (가솔린 엔진 배출가스 제어장치에 대한 고장사례 고찰)

  • Lee, Il Kwon;Lee, Jong Ho;Lee, Young Suk;Youm, Kwang Wook;han, Jae Oh;Lim, Ha young
    • Journal of the Korean Institute of Gas
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    • v.20 no.6
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    • pp.37-42
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    • 2016
  • The purpose of this paper is to study for the emission gas control of passenger car. The first example, the PCSV never open when operating condition, but it opened by causing malfunction because of trouble. As a result, the purge gas entered into surge tank, a mount of fuel was displayed with excessive supply on tester. Therefore, it certified the bad-condition of the engine when idling by decreasing of fuel injection quantity from engine ECU. The second example, the hose activating a EGR valve didn't supply the vacuum pressure because of assembling the other part. Thus, it knew the bad-condition of engine that the EGR valve would not work normally by leaking with the other port. The third example, as the rear oxygen sensor of two sensor were fault-installing by changing the sensor of other a car it could not detect of oxygen quantity. Finally, it found the phenomenon of abruptly decreasing vehicle speed when braking a car. Therefore, the system including with emission control has to drastically manage by maximizing condition to role decreasing the emission gas.

Influence of Reaction Temperature on Bio-oil Production from Rice Straw by the Pyrolysis (볏짚으로부터 바이오오일 생산에 대한 열분해 반응온도의 영향)

  • Kang Bo-Sung;Park Young-Kwon;Kim Joo-Sik
    • Resources Recycling
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    • v.15 no.1 s.69
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    • pp.12-19
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    • 2006
  • Rice straw is one or the main renewable energy sources in Korea. Bio-oil is produced from rice straw with a lab-scale equipment mainly with a fluidized bed and a char removal system. It was investigated how the reaction temperature affected the production of bio-oil and the efficiency of a char removal system. To elucidate how the temperature depended on the production of bio-oil, experiments were conducted at $466^{\circ}C,\;504^{\circ}C\;and\;579^{\circ}C$, respectively. The mass balance was established in each experiment, and the produced gas and oil were analyzed with the aid of GCs and a GC-MS system. The char removal system is composed of a cyclone and a hot filter. Tn the experiments, we observed that the production of bio-oil was decreased with temperature, and the bio-oil contained very useful chemicals.

Development of Natural Gas Steam Reformier for Small Scale On-Site Production of Hydrogen (소규모 현장 생산 방식에 의한 수소 제조용 천연가스 수증기 개질기 개발)

  • Seo Dong Joo;Seo Yutaek;Seo Yong Seog;Park Sang Ho;Jeong Jin Hyeok;Yoon Wang Lai
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.264-267
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    • 2005
  • 수소의 소규모 분산 생산 기술은 본격적 인 수소 인프라가 도입되기 전에 연료전지 자동차의 수소 충 전용이나 분산 발전형 연료전지의 수소 공급을 위해 필요하다. 생산 용량은 수소 기준으로 $10\~100 Nm^3/hr$ 정도로 현재로선 천연가스의 수증기 개질법이 가장 경제적인 공정으로 알려져 있다. 소규모 생산에 따른 열효율 저하를 줄이 기 위해 단위 공정들이 통합된 컴팩트 개질 시스템의 개발이 필요하다. 핵심 기술인 컴팩트 리포머의 국산화 기술 확보를 위하여 $20 Nm^3/hr$용량의 동심관형 리포머를 설계, 제작하였다. 내부구조는 제작의 단순화를 고려하여 중첩된 동심관이 배열되었고 압력 손실과 열웅력 발생을 억제하도록 유로를 배치하였다. 수증기개질 반응에 필요한 반응열은 리포머 본체에 부착된 버너를 이용하여 공급하였다. 성능 측정을 위한 부속 기기로 상온 흡착식 탈황기, 폐열 회수형 수증기 발생기, 반응물 예열을 위한 열교환기, 생성 가스 응축기를 설계 제작하여 전체 리포밍 시스템을 구성하였다. 반응 온도 $680\~720^{\circ}C$, 탄소 대 수중기 비(S/C ratio) $2.7\~3.2$ 조건에서 수증기 개질 반응을 수행하였다. 해당 반응 조건에서 메탄 전환율 $89\%$ 이상, 저위 발열량 기준 개질 열효율 $70\%$ 이상을 달성하였고 개질 생성가스 내 수소의 최대 유량은 $23.4Nm^3/h$였다. 개발된 리포밍 시스템은 고순도 수소 생산이 필요한 경우, 수소 수율 향상을 위한 고온 수성 가스 전화 반응기를 통합 가능하도록 열교환기 구성을 조정할 수 있으며 용융 탄산염 연료전지와 같이 고온형 연료전지의 경우 $550^{\circ}C$ 이상으로 개질 생성 가스를 공급하도록 구성할 수도 있다. 향후 리포머 본체의 개질 효율 향상 및 장치 소형화, 부속 기기의 최적화를 통한 전체 리포밍 시스템 개선, 스케일 업 설계를 위한 엔지니어링 설계 패키지 구성을 계획하고 있다.

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Design of Spark Advanced Controller for Improvement in Power and Torque of CNG Bi-Fuel Vehicle (압축천연가스 겸용 차량의 출력 및 토크 향상을 위한 점화 진각 제어기 설계)

  • Park, Jin-Hyun;Kim, Sung-Hoon;Cho, Seung-Wan;Choi, Young-Kiu
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.7
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    • pp.1641-1646
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    • 2010
  • Recently, environmental concerns increased, CNG fuel research for the prevention against air pollution is actively. But, the problems of CNG fuel have less output and a shorter charging distance than gasoline. Especially, the causes of the torque and output reduction are the mixed fuel has a combustion timing loss in case of CNG fuel which has a smaller heating value per a unit volume and a slower flame propagation speed than gasoline. In this paper, we design the spark advanced controller in consideration of the spark timing loss. Through the experimental of chassis dynamometer, we show that maximum power and torque have improved compared to that of general CNG bi-fuel system.

A Study on the Measurement Technique for Injection Rate and the Effects of the Nozzle Hole Number on Injection Characteristics (디젤 인젝터의 분사율 측정 기술과 분공수 변화가 분사특성에 미치는 영향에 관한 연구)

  • 이기형;정재우;이창식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.3
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    • pp.1-7
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    • 2002
  • Recently, many researches for the improvement of DI diesel engines have been performed to reduce the fuel consumption and exhaust emissions. Among the various factors effect on combustion and emission in Dl diesel engines, one of the most important factors is the characteristics of the fuel spray. Accordingly, the investigation on the characteristics of spray is needed to analyze the diesel combustion exactly, In this study, the measurement technique fur injection rate using the Zeuch method was developed. In addition, the effects of nozzle hole number on the spray and flame were investigated by visualization experiment.

Recent Research Works on Chemiluminescence as Measures of Combustion Characteristics (화학발광을 활용한 연소계측 연구동향)

  • Seo, Seonghyeon;Moon, Insang
    • Journal of the Korean Society of Propulsion Engineers
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    • v.18 no.1
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    • pp.73-84
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    • 2014
  • The present paper includes recent research works on the estimation of physical properties like equivalence ratio and heat release rate of flame through chemiluminescence measurement. Modern combustion devices require a precise control to increase combustion stability as well as to suppress pollutant emissions. The determination of combustion characteristics from chemiluminescence provides practical advantages over other techniques. However, the technique is dependent on equivalence ratio, combustion pressure, inlet temperature, turbulent intensity and fuel type. The intensity ratio of $OH^*$ and $CH^*$ has a strong relation with an equivalence ratio for methane/air premixed flames. The global measurement of chemiluminescence is accepted as a good indicator for a global heat release rate.

A Study on the Formation of Hydrate Plugging due to water molecules in High Pressure and Low Temperature Gas Pipeline (고압$\cdot$저온 가스 배관에서 수분에 의한 하이드레이트 플러깅 형성)

  • Lee J. H.;Baek Y. S.;Sung W. M.
    • Journal of the Korean Institute of Gas
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    • v.6 no.1 s.17
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    • pp.38-45
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    • 2002
  • Hydrates are solid cryctallines resembling ice in appearance, which are consist of a gas molecule surrounded by a cage of water molecules. Because of containning a large amount of methane, hydrates have been considered as a future energy resource. However, the formation of hydrates in the oil and gas industries has been known as a serious problem for a long time. The formation of hydrate in pipeline is common in seasonally cold or sub-sea environments with low temperatures and high pressures. Especially, hydrate plug formation becomes a real menace to flow assurance in inadequately protected transmission lines. This study was carried out for the purpose of understanding mechanism of hydrate plugging and examining formation conditions of hydrate in high pressure gas pipeline. In this study, we measured hydrate equilibrium conditions under the various flowing conditions with the methane. The results were presented both the plugging tendency and the effect of flowing velocity.

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