• Title/Summary/Keyword: exhaust system

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Status of Welding Fume Concentration and Local exhaust Ventilation System at Welding Laboratory in Technical High School (공업고등학교 용접실습실의 용접흄 발생농도와 국소배기 실태)

  • Hwang, Sung-Hwan;Son, Bu-Soon;Jang, Bong-Ki;Park, Jong-An;Lee, Jong-Wha
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.11 no.1
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    • pp.1-8
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    • 2001
  • This study was performed to evaluate a local exhaust ventilation system capability and welding fume concentration in welding laboratory at 5 technical high schools. Results of the study are as follows; 1. The personal exposure of welding fume in welding laboratory was measured. The geometric mean of 73 personal samples was $6.27mg/m^3$($3.85{\sim}9.88mg/m^3$), and 68.5% of these exceeded TLV of the Korea Ministry of Labor. 2. The geometric mean of welding fume at outside of booth was $2.27mg/m^3$($1.57{\sim}2.58mg/m^3$). All of measured concentrations were lower than TLV of the Korea Ministry of Labor. 3. Local exhaust ventilation system in welding laboratory could not remove hazardous substance effectively because of inappropriate canopy hood and absurd design. 4. The possibility of exposure risk was estimated to be high because of working point under breathing zone, misplacement of working table and insufficient supply of respiratory protector. 5. The mean values of capture velocity and transportation velocity of local exhaust ventilation system in welding laboratory were 0.38m/sec, 4.27m/sec respectively. These values were satisfied the guideline of the Korea Ministry of Labor. 6. The efficiency of performance of local ventilation system was anticipated to be decreased because of accumulated dust and alien substance on fan and duct.

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A Study on Exhaust Gas Characteristics and Engine Performance of EGR Valve Installed Engine for Development of EGR Valve Test System (EGR 밸브 평가 장치 개발을 위한 EGR 장착 엔진 성능 및 배출 가스 특성 연구)

  • Na, D.H.;Ko, C.S.;Seo, H.J.;Lee, C.E.
    • Journal of Drive and Control
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    • v.9 no.4
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    • pp.52-57
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    • 2012
  • In this study, in order to understand contents and ranges of design for the EGR Valve test system for improving quality and performance of EGR Valve, engine performance and exhaust gas characteristic of 3L-class diesel engine was analyzed. Experimental operation of engine performance test was performed with 50% engine load and 20% and 100% opening ratio of EGR Valve. From test of performance and exhaust gas characteristic of engine, torque output of engine and temperature and pressure of inlet and outlet of EGR Valve were measured. As a result, for design of EGR Valve test system, input fluid flow of EGR Valve must be set the same amount with exhaust gas flow that was below of engine speed of 2,500 rpm, and temperature of inlet of EGR Valve must be set under about $510^{\circ}C$. And the difference of temperature between inlet and outlet of EGR Valve must be over than about $200^{\circ}C$. Exhaust gas of inlet and outlet of EGR Valve were under 1 bar that was not considerable, and the difference of pressure between inlet and outlet of EGR Valve were under 1 bar that could not effect on mechanical operation of EGR Valve.

Improvement of algorithm for the calculation of gas flowin intake and exhaust system on diesel engines (내연기관의 흡.배기계내 가스유동해석용 알고리즘의 고정도화)

  • K.Kanamaru
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.1
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    • pp.107-114
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    • 2001
  • Many simulation programs included intake and exhaust system on diesel engines have been developed. However, existing programs using 1-D numerical analytic methods in manifold gas flow by the method of characteristics have some problems to be solved.. Especially to optimzing the engine system, a simulation program which had more efficiency and accuracy is required newly. In this paper, a improved method for application limit and efficiency as well as mass conservation named constant mesh explicit method of characteristic was described. And some calculation results by this method were compared with experimental results and orther calculation results. Also, it was confirmed that the results by the proposed method were more agreed with experimental results.

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DEVELOPMENT OF HIGH EFFICIENCY COGENERATION SYSTEM USING BIOGAS FOR THE LOWER POLLUTION OF THE ENVIRONMENTAL

  • Park, J.S.;Ishii, K.;Terao, H.
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 2000.11c
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    • pp.670-675
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    • 2000
  • The purpose of the study is development and investigation about basic performance of the system operation on a dual fueled cogeneration system(CGS), which is operated with biogas and gas oil. As often seen in dual fueled CGS performance, the electric generating efficiency was obtained about 26□. Methane contained in the biogas could not bum completely at lower load, and it was discharged into exhaust gas. Considerable amount of the methane burned in the exhaust pipe, and the heat recovery ratio was 42□ on heat balance. As a result, the total heat efficiency, which is a summation of generating efficiency and heat recovery efficiency reached to about 70□. The supply of biogas into the engine reduces smoke density and NOx concentration in exhaust gas. At lower load, methane burned slowly and large portion of it was discharged without burning. Therefore the measures are desirable that promotes combustion of methane at lower load.

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A Study on the Reduction of Harmful Exhaust Gas with Diesel-Methanol Stratified Injection System in a Diesel Engine (층상연료분사(경유/메탄올)를 이용한 디젤엔진의 유해 배출물 저감에 관한 연구)

  • 강병무;안현찬;이태원;정성식;하종률
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.4
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    • pp.43-50
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    • 2002
  • In the present study, reduction of harmful exhaust gas in a diesel engine using stratified injection system of dual fuel (diesel fuel and methanol) was tried. The nozzle and fuel injection pump of conventional injection system were remodeled to inject dual fuel in order from the same injector. The quantity of each fuel was controlled by micrometers, which were mounted at rack of injection pumps. The injection ratio of dual fuel was certificated by volumetric ratio in injection quantity test. Cylinder pressure and exhaust gas were measured and analyzed under various supply condition of duel fuel. We confirmed that combustion of dual fuel was performed successful1y by using modified injection system in a D.I. diesel. Soot and NOx are simultaneously reduced by stratified injection without large deterioration of thermal efficiency, but THC and CO are relatively increased.

The Application of Dump Combustor for Evaluation of DPF(Diesel Particulate Filter) System (DPF 성능 평가를 위한 Dump Combustor의 활용)

  • Nam, Youn-Woo;Lee, Won-Nam;Oh, Kwang-Chul;Lee, Chun-Beom
    • 한국연소학회:학술대회논문집
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    • 2007.05a
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    • pp.98-103
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    • 2007
  • The number of vehicles employing diesel engines is rapidly rising. Accompanying this trend, application of an after-treatment system is strictly required as a result of reinforced exhaust regulations. The Diesel Particulate Filter (DPF) system is considered as the most efficient method to reduce particulate matter (PM), but the improvement of a regeneration performance at any engine operation point presents a considerable challenge by itself. Temperature, gas compostion and flow rate of exhaust gas are important parameters in DPF evaluation, especially regeneration process. Engine dynamometer and degment tester are generally used in DPF evaluation so far. But these test method couldn't reveal the effect of various parameters on real DPF, such as O2 concentration, amount of soot and exhaust gas temperature. This research has studied the possibility using dump combustor that used to take an approach lean premixed combustion in gas turbine for a DPF power and optimized. It is possible that utilize the system as DOC (Diesel Oxidation Catalyst) and SCR(Selective Catalytic Reduction) assessments test as well as DPF evaluation

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Structural Design and Analysis of Measurement Sensor of Automotive Exhaust System (자동차 배기관 시스템 계측 센서의 구조 설계 및 해석)

  • Kim, Sangkee;Lee, Sunhee;Park, Hyunbum
    • Journal of Aerospace System Engineering
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    • v.10 no.1
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    • pp.82-85
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    • 2016
  • In this study, structural design of exhaust gas sensor of automobile was performed. In order to evaluate the structural design of the measurement sensor, the structural analysis was performed by the finite element method. The vibration and thermal stress analysis was carried out at the high temperature condition. Finally, the structural test of sensor system was performed, and used for comparison with the analyzed model. Through the structural analysis and test, it is confirmed that the designed measurement sensor structure is acceptable.

Estimation on locations of air-supply and exhaust ports in the nacelle of wind turbine (풍력터빈 나셀 냉각시스템의 급.배기 위치 평가)

  • Woo, S.W.;Kim, H.T.;Lee, J.H.;Lee, K.H.;Park, J.P.
    • 한국전산유체공학회:학술대회논문집
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    • 2011.05a
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    • pp.240-242
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    • 2011
  • Wind power system is generally divided into the onshore wind turbine and the offshore wind turbine according to site locations. The offshore wind turbine is manufactured as a closed nacelle cooling system including a heat exchanger to prevent corrosion, but the onshore wind turbine is manufactured as open nacelle cooling system dependent on only the outdoor air without a heat exchanger. The indoor of a nacelle which is composed of a generator, foil power converters and a gearbox with a lot of heat is very narrow and airtight. This aim of the study is to demonstrate the temperature effect depending on positions of air-supply and exhaust ports. And this study discusses the flow field and removal efficiency of heat caused by components.

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Noise Analysis of Intake System by Hybrid Method (하이브리드 방법을 이용한 배기계 소음 해석)

  • 이장명;한성수;임학종
    • Journal of KSNVE
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    • v.9 no.2
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    • pp.310-316
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    • 1999
  • 4-Pole parameter method based on an acoustic theory is very popular for the analysis of the acoustic behavior of the car exhaust system. However, this method is applicable only for the simple shape of acoustic elements of the muffler. Numerical methods such as FEM(Finite Element Method) or BEM(Boundary Element Method) can also provide acceptable results for the acoustic analysis of the car exhaust system. Even though these numerical methods have benefits for the analysis of complicated shape of acoustic elements of the muffler, time consuming is another problem during modeling and numerical calculation. Combining benefits of both methods, the new code called the hybrid method for car exhaust system is introduced. And the developed code is utilized for calculation of the transmission loss of a main muffler of an automobile comparing with the experimental results.

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A Study on the exhaust gas characteristics of the vehicle gasoline according to the ambient temperature (대기온도에 따른 휘발유 자동차의 배출가스 특성에 관한 연구)

  • Lim, Jae-Hyuk;Kim, Ki-Ho;Kim, Sung-Woo;Lee, Min-Ho;Oh, Sang-Gi
    • Journal of Power System Engineering
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    • v.19 no.6
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    • pp.47-53
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    • 2015
  • Korea is the geographic location during the summer, the temperature rising to $35^{\circ}C$ and winter temperature is $-15^{\circ}C$ to reduce the air temperature changes, such as relatively large compared to other countries. This increase or decrease of the harmful exhaust gas discharged from automobile substantially inconvenience a significant impact on the active side of the car engine temperature and exhaust gas reducing device receives a large impact on the atmospheric temperature is regulation to be different. However, domestic vehicle emissions test temperature of $20{\sim}30^{\circ}C$ is it does not reflect this situation the actual test temperature to accurately measure the exhaust gas volume of the vehicle is difficult. In this study, domestic automobile exhaust gas test conditions of a test temperature $20{\sim}30^{\circ}C$ various temperatures, including (35, 25, 0, -7, -15, $-25^{\circ}C$) under the two vehicles (2.0L MPI, 2.4 L GDI) as was discussed with respect to the exhaust gas characteristics of the vehicle according to the ambient temperature gas. As a result, domestic emissions test temperature of $25^{\circ}C$ than average conditions were temperature decreases greenhouse gas emissions and increase overall increased by up to 15 times higher. Air temperature and the engine exhaust gas inconvenience a direct effect on the activation temperature required in the reduction unit is determined to be an increase of emissions and greenhouse gases, and also an increase in the variety of lubricants based lubricating and viscosity reduction, such as the engine oil due to the low temperature of these result It is considered that shows the.