• Title/Summary/Keyword: Common exhaust system

Search Result 62, Processing Time 0.02 seconds

An experimental study on exhaust gas variation depending on EGR rate of common rail engine (커먼레일엔진 EGR RATE에 따른 배기가스 변화에 대한 실험적 연구)

  • Kim, Jin-Yong;Na, Byung-Chul;Lee, Kye-Cheul;Seo, Joon-Ho
    • Proceedings of the KSME Conference
    • /
    • 2004.04a
    • /
    • pp.2167-2172
    • /
    • 2004
  • Current common rail engines are equipped with cooled EGR systems by using an engine cooling water system. In this study, investigations of exhaust gas reduction characteristics have been carried out in the common rail engine system depending on the EGR rate variation. The experimental results shows that NOx reduces and smoke increases as the EGR rate increases.

  • PDF

Control Method to Ensure Uniform Exhaust Function by Household of Apartment House (공동주택의 세대별 균등 배기량을 확보 하는 제어방법에 관한 연구)

  • Kwon, Yong-Il
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.29 no.12
    • /
    • pp.628-637
    • /
    • 2017
  • This study was conducted to present an effective control method for the common duct system to uniformly discharge volume flow rate exhausted from the kitchen and bathroom of each household in an apartment regardless of the position of household. Since the common duct system is installed vertically and the ventilator is installed in the terminal, the static pressure of each household decreases when vertical height increases. Therefore, the volume flow rate exhausted from each household is different. In order to improve such a phenomenon, a constant air volume damper shall be installed in a branch duct coupled with a common vertical duct system. The selected ventilator should also be able to handle the maximum volume flow rate considering diversity factor. Therefore, a uniform volume flow rate must be exhausted from all households where the hood is operated. This paper mainly focuses on suggestion of an optimum exhaust control method by comparing exhaust performance of each household according to the presence or absence of a constant air volume damper.

Experimental and Numerical Study on Flow Characteristics of a Common Exhaust System for Multiple SOFCs (SOFC용 복합 배기 시스템 유동 특성에 관한 실험 및 수치해석적 연구)

  • DAEWOONG JUNG;JONGHYUK YOON;HYOUNGWOON SONG
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.34 no.6
    • /
    • pp.657-666
    • /
    • 2023
  • In this study, experiments and numerical analysis were conducted to investigate the exhaust gas flow in a common exhaust system of multiple solid oxide fuel cells. The system was fabricated based on KGS code and operated within a pressure range of 0.12 kPa, with flow rates ranging from 79.1 to 103.4 L/min. Numerical modeling was validated with a mean absolute error of 3.8% for pressure results. The study assessed the impact of changes in area ratio and emergency stops on pressure distribution, velocity vectors, and wall shear stress. The findings revealed no significant factors causing high differential pressure or backflow.

An Empirical Evaluation of Safety of the Common Vent Structure for Stationary Fuel Cell Systems (건물용 연료전지 복합배기구조 안전 실증평가)

  • LEE, EUN-KYUNG;LEE, JUNG-WOON;MOON, JONG-SAM;LEE, SEONG-HEE;SHIN, DONG-HUN
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.29 no.6
    • /
    • pp.596-605
    • /
    • 2018
  • Interest in hydrogen, as an energy carrier, has been growing to solve the problems on shortage of fossile fuels and greenhouse gas. According to the standard KGS FU 551 for stationary fuel cell installation, the fuel cell system could be connected up to two common exhausts to one floor. depending on the required power for building or the installation environment in buildings, multiple fuel cell systems could be installed. Afterwards the number of perforations and flues could be decided. Hence, economic efficiency in significantly determined with respect to installation area and the number of fuel cell systems. In addition, the complexity of common vent structure for stationary fuel cell systems could be changed. In this paper, Verification experiments were conducted by connecting the common exhaust system to the fuel cell simulation system and the actual fuel cell system. Humidity and temperature were changed at ON/OFF, but no factors were found to affect performance or system malfunction. Exhaust emissions were also measured to obtain optimized values. We intend to expand the diffusion of stationary fuel cells by verifying safety of common exhaust structure.

A Study on the Performance Characteristic of Common Rail High Pressure Pump (커먼레일 시스템용 고압펌프의 성능 특성에 관한 연구)

  • Lee, Choon-Tae
    • Journal of Power System Engineering
    • /
    • v.17 no.6
    • /
    • pp.5-10
    • /
    • 2013
  • Diesel engines have the advantages of good fuel efficiency and low emissions. Therefore, car makers have been developed various kinds of diesel engine management system to clean up emissions while improving fuel efficiency. One of them is the common rail system. In the common rail system, diesel fuel is injected into the combustion chamber at ultra high pressures up to 1,800 bar to ensure more complete combustion for cleaner exhaust gas, and highly precise multiple injection reduces NOx emission, combustion noise and vibration. Generally speaking, common rail system consists of booster pump, high pressure pump, common rail, injectors, control valves, and sensors. The high pressure pump receives low pressure fuel from the booster pump and supply high pressure fuel to injectors through the high pressure common injection rail. Therefore, high pressure pump has an important role in common rail system. In this paper, we have investigated the performance of high pressure pump of common rail system.

A Study for Characteristics of Performances and Exhaust Emission on Blending Rates of Biodiesel Fuel in a Common-Rail Injection Diesel Engine (커먼레일 분사방식 디젤기관에서 바이오디젤유의 혼합율에 따른 성능 및 배기배출물 특성 연구)

  • Choi, S.H.;Oh, Y.T.
    • Journal of Power System Engineering
    • /
    • v.10 no.2
    • /
    • pp.5-10
    • /
    • 2006
  • Our environment is faced with serious problems related to the air pollution from automobiles in these days. In particular, the exhaust emissions of diesel engine are recognized main cause which influenced environment strong. In this study, the potential possibility of biodiesel fuel was investigated as an alternative fuel for a naturally aspirated common rail diesel engine. The smoke emission of biodiesel fuel 30vol-%(max. content) was reduced in comparison with diesel fuel, that is, it was reduced approximately 60% at 4000rpm, full load. But, power, torque and brake specific energy consumption didn't have no large differences. But, NOx emission of biodiesel fuel was increased compared with commercial diesel fuel.

  • PDF

Heat Recovery Characteristics of the Exhaust Heat Recovery System with Heat Pipe Unit Attached to the Hot Air Heater in the Greenhouse (히트파이프를 이용한 온풍난방기 배기열회수 시스템의 열회수 특성)

  • Kang, K. C.;Kim, Y. J.;Ryou, Y. S.;Baek, Y.;Rhee, K. J.
    • Journal of Biosystems Engineering
    • /
    • v.26 no.5
    • /
    • pp.441-448
    • /
    • 2001
  • Hot air heater with light oil combustion is used as the most common heater for greenhouse heating in the winter season. However, exhaust gas heat discharged to atmosphere through chimney reaches up to 10~20% of total heat capacity of the oil burred. In order to recover the heat of this exhaust gas and to use for greenhouse heating, the heat pipe type exhaust heat recovery system was manufactured and tested in this experiment. The system consisted of a heat exchanger made of heat pipes, ø15.88${\times}$600mm located in the rectangular box of 675(L)${\times}$425(W)${\times}$370(H)mm, an air suction fan and air ducts. The number of heat pipe was 60, calculated considering the heat exchange amount between exhaust gas and air and heat transfer capacity of a heat pipe. The working fluid of heat pipe was acetone because acetone is known for its excellent heat transfer capacity. The system was attached to the exhaust gas path. According to the performance test it could recover 53,809 to 74,613kJ/h depending on the inlet air temperature of 12 to -12˚at air flow rate of 1.100㎥/h. The temperature of the exhaust gas left the heat exchanger dropped to 100$^{\circ}C$ from 270$^{\circ}C$ after the heat exchange between the suction air and the exhaust gas.

  • PDF

Fuel Injection System on Combustion and Exhaust Emissions Characteristics in Compression Ignition Engines (압축착화 엔진에서 디젤-가솔린 Dual Fuel이 연소 및 배기 특성에 미치는 영향)

  • Kwon, Seok-Joo;Cha, June-Pyo;Sung, Ki-An;Park, Sung-Wook
    • Journal of the Korean Society of Combustion
    • /
    • v.16 no.1
    • /
    • pp.52-57
    • /
    • 2011
  • The present study describes the characteristics of combustion and exhaust emissions in compression ignition engines using diesel-gasoline dual fuel. For investigating combustion characteristics, diesel fuel was injected directly in a single-cylinder compression ignition engine with a common-rail injection system and gasoline fuel was injected into a premixed chamber installed in an intake port. In order to investigate exhaust emission characteristics, exhaust gas was measured by emission analyzer and smoke meter. The experimental results showed that cases of diesel-gasoline dual fuel combustion exhibited extended ignition delay and reduced peak combustion pressure compared to those of directly injected diesel fuel cases. Furthermore, premixed gasoline-air mixture reduced NOx emissions due to low peak of rate of heat release(ROHR).

Effect of Injection Parameters on Combustion and Exhaust Emission Characteristics in a Small Common-rail Diesel Engine (분사 조건의 변화가 소형 커먼레일 디젤 엔진의 연소 및 배기 특성에 미치는 영향)

  • Kim, Myung-Yoon;Lee, Doo-Jin;Roh, Hyun-Gu;Lee, Je-Hyung;Lee, Chang-Sik
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.12 no.6
    • /
    • pp.9-15
    • /
    • 2004
  • The characteristics of combustion and emissions were investigated in a single cylinder DI diesel engine equipped with a common rail injection system. This study presents an experimental study of the effect of engine speed, injection timing, injection pressure and pilot injection timing on the combustion and exhaust emissions. The engine speeds were 1000 and 2000rpm and the corresponding injection pressures were 50 and 100MPa. Experimental results show that NOx emissions decrease with retarded injection timing, while HC and CO emissions increases. Higher injection pressure increases NOx with lower soot emissions. For the case with the pilot injection prior to main injection, the ignition delay is shortened and the premixed combustion ratio decreases. Also NOx and soot emissions are decreased with increase of pilot injection advance.

EXHAUST GAS HEAT RECOVERY SYSTEM FOR PLANT BED HEATING IN GREENHOUSE PRODUCTION

  • Kim, Y.J.;Ryou, Y.S.;Rhee, K.J.;Kang, G.C.
    • Proceedings of the Korean Society for Agricultural Machinery Conference
    • /
    • 2000.11c
    • /
    • pp.639-646
    • /
    • 2000
  • Hot air heater with light oil combustion is the most common heater for greenhouse heating in the winter season in Korea. However, since the heat efficiency of the heater is about 80%, considerable unused heat in the form of exhaust gas heat discharges to atmosphere. In order to capture this exhaust gas heat a heat recovery system for plant bed heating in the greenhouse was built and tested in the hot air heating system of greenhouse. The system consists of a heat exchanger made of copper pipes, ${\phi}\;12.7{\times}0.7t$ located inside the rectangular column of $330{\times}330{\times}900mm$, a water circulation pump, circulation plastic pipe and a water tame The total heat exchanger area is $1.5m^2$, calculated considering the heat exchange amount between flue gas and water circulated in the copper pipes. The system was attached to the exhaust gas path. The heat recovery system was designed as to even recapture the latent heat of flue gas when exposing to low temperature water in the heat exchanger. According to performance test it can recover 45,200 to 51,000kJ/hr depending on the water circulation rates of 330 to $690{\ell}$/hr from the waste heat discharged. The exhaust gas temperature left from the heat exchanger dropped to $100^{circ}C$ from $270^{circ}C$ by the heat exchange between the water and the flue gas, while water gained the difference and temperature increased to $38^{circ}C$ from $21^{circ}C$ at the water flow rate of $690{\ell}$/hr. And, the condensed water amount varies from 16 to $43m{\ell}$ at the same water circulation rates. This condensing heat recovery system can reduce boiler fuel consumption amount in a day by 34% according to the feasibility study of the actual mimitomato greenhouse. No combustion load was observed in the hot air heater.

  • PDF