• Title, Summary, Keyword: Exhaust gas temperature

Search Result 686, Processing Time 0.036 seconds

A Study on the Optimum Cooling Water Temperature Control of an Automotive Engine(I) (자동차용 기관의 냉각수 온도조절 최적화에 관한 연구(I))

  • 박경석;신진식;이경우
    • Journal of the korean Society of Automotive Engineers
    • /
    • v.14 no.2
    • /
    • pp.34-43
    • /
    • 1992
  • The purpose of this study is to consider the performance and exhaust characteristics in the practical engine according to the cooling water temperature change of engine and to set up the optimum cooling condition and to obtain the optimum operating condition of thermostat in the cooling system. In order to accomplish the purpose of this study, authors have used the following procedure. 1. This study is to investigate the influence of the cooling water temperature on the engine performance and the exhaust gas, authors regulated the cooling water temperature by using the special closing circuit and measured the concentration of exhaust gas by using the exhaust gas measuring system in the exhaust pipe. 2. This study carried out the experiment by regulating the opening degree of throttle valve and engine speed in the dynamometer and by changing the cooling water temperature, at the same time kept air-fuel ratio constant and made the spark ignition time MBT(Minimum spark advance for Best Torque) 3. This study measured the cooling water temperature by using the K-type thermocouple centring around the easy over-heated parts and by installing a special closing circuit. Therefore, in this study, authors intend to examine the influence of the cooling water temperature on the engine performance, exhaust gas and present the basic materials needed in the engine design including the optimum operating time control system for the cooling water temperature.

  • PDF

A study on the application of recuperative burner system to a teeming ladle (티밍래들에 폐열회수버너의 적용)

  • 양제복;정대헌;김원배
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
    • /
    • /
    • pp.180-192
    • /
    • 1998
  • One of the conventional gas burners has nowadays been used for ladle preheating. As a ladle is one of the open-type furnaces, however, it causes to consume much fuel because of high temperature of exhaust gas from the ladle and the exhaust gas passing through ladle cover makes it worsen a working environment nearby. Therefore, the objective of this study is to develop the recuperative burner system applying for an existing teeming ladle , which is integrated with burner, recuperator and eductor as one of the new type combustion equipments and has many advantages of simple installation, compactness and easy control, especially a great deal of energy saving through the waste heat recovery from exhaust gas. The contents of the study is to design, manufacture of recuperative burner system and to perform its tests experimentally after applying to the teeming ladle in the capacity of 100 ton. Its heat release rate is 1,700,000 kcal/h with COG(Cokes Oven Gas) as fuel gas. The test items are the temperature distribution inside the ladle and the preheated air temperature change depending upon the exhaust gas. Nox, exhaust gas analysis and noise.

  • PDF

A Study on the Occurrence Character of Contaminant in the Kitchen that Use Gas Fuel (가스를 연료로 사용한 주방에서의 오염물질 발생 특성에 대한 연구)

  • 박명길;함진식
    • Proceeding of Spring/Autumn Annual Conference of KHA
    • /
    • /
    • pp.77-82
    • /
    • 2001
  • This paper is contents that measure the ventilation rates and temperature by driving condition of exhaust fan, vapor, contaminant occurrence amount of carbon dioxide etc. In kitchen of apartment house. The ventilation rates in the apartment kitchen measured by Tracer Gas Method. And, temperature of when cook by gas table hood lower part 10cm and floor upside 10cm of kitchen central part, 120cm, 210cm heights measure. As ventilation rates measurement result, ventilation number of times was 0.7(number of times/hour) when did not to operate exhaust fan. but we were measured by 2.3(number of times/hour) when drove strongly. As temperature measurement result at cooking by gas table, temperature showed highest in hood lower part 10cm of case that do not operate exhaust fan. Temperature at kitchen central was most low in 10cm height in talc floor, and 210cm were measured highest. Concentration of carbon dioxide is very high by 4,350ppm after measurement time 10 minutes in state who do not operate exhaust fan at cooking by gas table.

  • PDF

Exhaust Flow Characteristics of Catalytic Converter Adapted to Exhaust Manifold (배기매니폴드 직접부착 촉매장치의 배기 유동특성)

  • Park, Young-Cheol;Lee, Chang-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.27 no.7
    • /
    • pp.837-844
    • /
    • 2003
  • The exhaust gas flow in the inlet collector of close coupled catalyst(CCC) adapted to the exhaust manifold is very complex flow because the exhaust gas is a pulsation flow with several port flow. The distribution of gas flow and temperature in inlet collector effect to the efficiency of catalytic converter. In this study, it measures temperatures on several point in inlet collector with two kind of inlet collector volume. And it analyzes with CFD to exhaust manifold and close coupled catalyst for temperature and flow. Comparing to measured and analyzed result, it find increasing of collector volume effects to catalyst temperature distribution and uniformity of catalytic converter

An Experimental Study for Reducing the Exhaust Hydrocarbon Emission at SI Engine Using Timed Secondary Air Injection (2차 공기 분사에 의한 스파크 점화 가솔린 엔진의 배기 Hydrocarbon 저감에 관한 실험적 연구)

  • 심현성;김세준;정석호
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.7 no.7
    • /
    • pp.104-112
    • /
    • 1999
  • An experimental study for reducing the exhaust hydrocarbon emission at spark ignition engine using timed secondary air injection is carried out . In this study, secondary air injection timings and durations are controlled to decrease the hydrocarbon emission and to increase exhaust gas temperature at cold and warm-up engine conditions. The hydrocarbon reduction rate and exhaust gas temperature are compared between timed secondary air injection and continuous air injection. The optimum secondary air injection timing for reducing the hydrocarbon emission is at the exhaust valve open timing. At some engine conditions , the hydrocarbon emissions are decreased to 10% of engine raw values and exhaust gas temperatures increase by 20$0^{\circ}C$ with times secondary air injection . Timed secondary air injection has more hydrocarbon reduction rate that continuous secondary air injection except some engine conditions.

  • PDF

A Study on Efficient Methods of Using Land Engine in the Small Fishing Vessel (소형 어선에서 육상용기관의 효율적인 이용방법에 대한 연구)

  • Lim, J.K.;Cho, S.G.;Hwang, S.J.
    • Journal of Power System Engineering
    • /
    • v.9 no.3
    • /
    • pp.5-9
    • /
    • 2005
  • A study on the performance and exhaust emissions of diesel engine with reducing exhaust gas temperature is performed experimentally. In this paper, experiments are performed at engine speed 2200rpm, 2600rpm and load 0%, 25%, 50%, 75% and 100% by test engine with F.W. cooler passing through exhaust gas. Main measured & analyzed parameters are exhaust gas temperature, specific fuel consumption, NOx and soot emissions etc. The obtained conclusions are as follows. (1) Specific fuel consumption is the least value at load 75% and it is decreased 1.5% after remodeling F.W. cooler. (2) NOx emission is the most value at load 100% and it is increased 30.1% after remodeling F.W. cooler. (3) Soot emission is the most value at load 100% and it is decreased 20.0% after remodeling F.W. cooler.

  • PDF

A Study of Catalyst Temperature Rise Effect by using UEGI(Unburned Exhaust Gas Ignition) Technology during Cold-Start (냉시동시 미연 배기가스 점화 기술을 이용한 촉매 온도 상승 효과에 관한 연구)

  • Kim, C.S.;Chun, J.Y.;Choi, J.W.;Kim, I.T.;Ohm, I.Y.;Cho, Y.S.
    • Proceedings of the KSME Conference
    • /
    • /
    • pp.335-340
    • /
    • 2000
  • Most vehicle's exhaust emissions come from the cold transient period of the FTP-75 test. In this study, UEGI technology was developed to help close-coupled catalytic converter (CCC) reach light-off temperature within a few seconds after cold-start. In the UEGI system, unburned exhaust mixture is ignited by four glow plugs installed upstream of the catalyst. Experimental results showed that the temperature of CCC rises faster with the UEGI technology, and the CCC reaches light-off temperature earlier. Under the conditions tested, the light-off time of the baseline case was 62 seconds and that of the UEGI case was 33 seconds.

  • PDF

Regeneration of Burner Type Diesel Particulate Trap System Through Active Exhaust Gas Feeding (배기 가스 유량 제어를 이용한 버너방식 디젤 입자상물질 제거 장치의 재생)

  • 김재업;박동선;이만복;김응서
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.5 no.1
    • /
    • pp.1-13
    • /
    • 1997
  • The key point that guarantees the durability of the ceramic monolith filter is to lower peak temperature and temperature gradient inside filter during regeneration. The control of the exhaust gas flow rate into the filter, by the bypass technique of the exhaust gas, enables the gas temperature in filter to be constant for regeneration. A couple of methods, which are the ON/OFF and PID control of the bypass valve, were used for feedback control of the gas temperature. These techniques showed that the ceramic filter was regenerated perfectly under the peak temperature and peak temperature gradient limitations for durability.

  • PDF

The Effect of Temperature and Flow Rate in Hot Exhaust Gas on the NOx Emission and Flame Structure of Diffusion Flame (고온 배기가스의 온도 및 유량이 확산화염의 구조 및 NOx 발생에 미치는 영향)

  • Sohn, H.S.;Jang, S.W.;Kim, H.Y.
    • 한국연소학회:학술대회논문집
    • /
    • /
    • pp.139-146
    • /
    • 2001
  • The experimental study was carried out for the diffusion flame characteristics of second stage combustor with the variations of temperature and supplying rate of hot exhaust gas from first stage combustor. It also examined the flame structure and NOx formation of the second stage combustor in which the fuel(natural gas) is supplying into the mixture of oxygen hot exhaust gas from first stage combustor. The results show that the increasement of temperature and flow rate of exhaust gas lead to increase the NOx up to 30ppm with 19% $O_2$ condition

  • PDF

An Experimental Study on Regeneration Characteristics by Variation of Exhaust Gas Temperature, HC and $O_2$ Concentrations on DOC-CDPF System (배기가스의 온도 및 HC와 $O_2$의 조성 변화에 따른 DOC-CDPF의 재생 특성에 관한 실험적 연구)

  • Cho, Yong-Seok;Lee, Seang-Wock;Lee, Jung-Sub;Yoon, Yu-Bin;Park, Young-Joon
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.17 no.1
    • /
    • pp.43-49
    • /
    • 2009
  • A catalyzed diesel particulate filter (CDPF) causes the progressive increase in back pressure of an exhaust system due to the loading of soot particles. To minimize pressure drop which is generated by CDPF, the filter should be regenerated when it collects a certain quantity of soot. It is important to know characteristics of regeneration of CDPF with various of exhaust gas temperatures and compositions. The oxidation of HC in DOC leads to increase gas temperature of DOC downstream. The increased gas temperature by DOC has an positive effect on CDPF regeneration. This study presents characteristics of regeneration of CDPF with DOC according to various gas composition, such as HC and $O_2$ concentration. The test-rig is used to control each gas composition and temperature during regeneration of CDPF. Experimental results indicate that the increased concentration of $O_2$ regenerates DPF more actively. With increasing HC concentration, the gas temperature of CDPF upstream increased due to more oxidation of HC. But excessive supply of HC leads to decrease of $O_2$ concentration in the CDPF, which makes it hard to regenerate CDPF.