• Title/Summary/Keyword: exhaust pollution

Search Result 368, Processing Time 0.025 seconds

A Study on Exhaust Gas Characteristics of Heavy-duty Diesel Engines through Actual Vehicle Application of Non-influenced Temperature Condition Type Active Regeneration Method (온도조건 비영향형 복합재생방식 DPF의 실차적용을 통한 대형디젤기관의 배출가스 특성 연구)

  • Yun chul Lee;Sang ki Oh
    • Journal of ILASS-Korea
    • /
    • v.29 no.2
    • /
    • pp.53-59
    • /
    • 2024
  • Cars are one of the main causes of air pollution in large cities, and 34.6% of domestic air pollution emissions come from mobile sources, of which cars account for 69.6%. In particular, the importance of nitrogen oxides (NOx) and particulate matter (PM), which are major pollutants in diesel vehicles, is increasing due to their high contribution to emissions. Therefore, in this study, the problem of natural regeneration caused by low exhaust gas temperature during low speed and low load operation was solved by applying a complex regeneration DPF that is not affected by temperature conditions to large diesel vehicles with higher driving time and engine displacement than small and medium-sized vehicles. And the feasibility of application to large diesel vehicles was reviewed by measuring the emission reduction efficiency. As a result of the reduction efficiency test on the actual vehicle durability product, PM showed a reduction efficiency of 84% to 86%, and the reduction efficiency of gaseous substances showed a high reduction efficiency of over 90%. The actual vehicle applicability test was completed with three driving patterns: village bus vehicle, police car, and road-going construction equipment vehicle, and no device problems occurred until the end of the test. Both load and no-load smoke measurement results showed a smoke reduction efficiency of over 96%.

Effect of Waste Heat Recovery Condensing Boiler with Condensed Water Recirculation Function (응축수 순환이 폐열회수 응축형 보일러 성능에 미치는 영향)

  • Keum, Kuk Bin;Kim, Sooik;Yu, Byeong-Hun;Lee, Chang Eon
    • 한국연소학회:학술대회논문집
    • /
    • 2015.12a
    • /
    • pp.201-204
    • /
    • 2015
  • Recently, energy excessive consumption and environmental pollution are the social issued. The most efficient way to solve both energy excessive consumption and environmental pollution is existing combustion system improved. This study was part of the assume and commercial used existing waste heat recovery condensing boiler to low emission performance for exhaust gas recirculation(EGR) and thermal efficiency rise by applying the condensed water recirculation(CWR) conducted. The researchers applied the EGR and CWR develop a new concept for the condensed water recirculation waste heat recovery condensing boiler. Waste heat recovery condensing boiler applied to the condensed water recirculation thermal efficiency of the same conditions was increased by about 4.8~5.5% and pollution emission also decreased.

  • PDF

A Study on the Development of Air Pollution Dispersion Model for Personal Computer (特定地域의 大氣汚染 擴散모델 開發에 關한 硏究)

  • 송기유;임흥재;윤명희
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.2 no.2
    • /
    • pp.19-30
    • /
    • 1986
  • This study was performed to develop a long-term air pollution dispersion model based on CDM program for use in the personal computer. The model CDM.PC, developmented for use of this study, simplified the plum equation of point pollution source in a windy state and sindless state. We used the classified 8 class stability, 16 wind direction and 4 class wind speed for the computer input climatological data. The plum rise equation is applied for CONCAWE's equation above 2,000 Kcal/sec of the exhaust calorie and Moses-Carson's equation below 2,000Kcal/sec at windy state, and Brigg's equation at calm. The time required is 200 minutes for drawing the air pollution contour for treating ten stacks under the above-stated conditions. It is the weakness of using personal computer that the operation time is longer than a large-size computer. But it strength is that the personal computer is used widely. To compare the treatment results of CDM.PC with TCM, we comfirmed that the shape of $SO_2$ pollution contour is similar but the concentration distribution is quite different because of characteristics of each models. Estimated and measured $SO_2$ concentration were similar, namely, Cest/Cob ratio of CDM.PC and TCM were respectively $0.96 \pm 0.25 (mean\pmS.D)$ and $1.08\pm0.26$.

  • PDF

Comparison of Correlation between CVS-75 Mode and Korea Mode to Estimate Emission Factors from Vehicles (자동차 오염물질 배출계수 산정을 위한 CVS-75모드와 국내차속모드의 상관성 비교 연구)

  • Jung, Sung-Woon;Ryu, Jeong-Ho;Lyu, Young-Sook
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.22 no.3
    • /
    • pp.383-391
    • /
    • 2006
  • In Korea, the major source of serious air pollution is motor vehicles. Air pollution from vehicles has been annually increased. Then the government will try to control the vehicle emission by applying the effective emission management policy for the manufactured and in-used car. It is necessary to correctly calculate the emission factor for successful propulsion of the vehicle emission control policy. In this study, correlation analysis of exhaust emissions from vehicles between CVS-75 mode and Korea mode was conducted. A total of 25 light-duty buses were tested on the chassis dynamometer system in order to measure CO, HC, NOx PM and fuel efficiency (F.E.). For the test modes, 10 different Korea modes and CVS-75 mode were used. As the result of correlation analysis between those modes, most of the correlation coefficients were higher than 0.90. On the basis of high correlation between those modes, correction factors by driving conditions were estimated. Through the results of this study, we obtained essential basic data to correct difference from those modes.

Exhaust VOCs Emission Characteristics from Motor Vehicles (자동차의 배기관 VOCs 배출 특성)

  • Lyu, Young-Sook;Ryu, Jung-Ho;Han, Jong-Soo;Kim, Sun-Moon;Lim, Cheol-Soo;Kim, Dae-Wook;Lee, Dong-Min;Lee, Joong-Koo;Eom, Myung-Do;Kim, Jong-Choon
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.24 no.3
    • /
    • pp.275-283
    • /
    • 2008
  • Since mobile source is a major source of VOCs, quantifying emissions from motor vehicles is an important factor to control VOCs in atmosphere. In this study, in order to evaluate tailpipe VOCs emissions from motor vehicles, mass emissions of non-methane volatile organic compounds from 45 vehicles were determined. Measurements were made on a chassis dynamometer using CVS-75 mode and speed specific drive modes. Target VOCs are 53 compounds determined as the volatile ozone precursors. The individual VOCs composition of vehicle emission and emission rates were also determined. In case of gasoline vehicles, VOCs emission from over 80,000 km vehicles were about 46% larger than less 80,000 km vehicles. The difference in benzene and toluene according to driving mileage was 44% and 26% respectively. The composition of VOCs were different by fuel type. The order of VOCs composition was paraffins>aromatics>olefins in gasoline vehicle emissions, paraffins>olefins>aromatics in light duty diesel vehicle emissions. The VOCs emissions were decreased as vehicle speed increasing. These results will be used to calculate total VOCs emissions from automobiles in the future.

Air Pollution Protection onboard by Seawater and Electrolyte

  • An Suk-Heon
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.30 no.1
    • /
    • pp.93-101
    • /
    • 2006
  • This research makes a new attempt to apply the activated seawater by electrolysis in the development of two-stage wet scrubber system to control the exhaust gas of large marine diesel engines. First, with using only seawater that is naturally alkaline (pH typically around 8.1). the $SO_2\;and\;SO_3$ are absorbed by relatively high solubility compared to other components of exhaust pollutants, and PM (Particulate Matter) is removed through direct contact with sprayed seawater droplets. Besides, the electrolyzed alkaline seawater by electrolysis, which contains mainly NaOH together with alkali metal ions $(i.e.\;Na^+,\;Mg^{2+},\;Ca^{2+})$, is used as the absorption medium of NOx and $CO_2$. Especially, to increase NOx absorption rate into the alkaline seawater. nitric oxide (NO) is adequately oxidized to nitrogen dioxide $(NO_2)$ in the acidic seawater, which means both volume fractions are adjusted to identical proportion. The results found that the strong acidic seawater was a valid oxidizer from NO to $NO_2$ and the strong alkaline seawater was effective in $CO_2$ absorption In the scrubber test, the SOx reduction of nearly $100\%$ could be achieved and also led to a sufficientPM reduction. Hence, the author believes that applying seawater and its electrolyte would bring the marine air pollution control system to an economical measure. Additionally it is well known that NOx and SOx concentration has a considerable influence on the $N_2O$ emission of green house gas. Although the $N_2O$ concentration exhausted from diesel engines is not as high, the green house gas effect is around 300 times greater than an equivalent volume of $CO_2$. Therefore, we investigated the $N_2O$ removal efficiency with using the electrolyzed seawater too. Finally this research would also plan to treat the effluent by applying electro-dialysis and electro-flotation technique s in the future.

Effects of Fuel Injection Timing on Exhaust Emissions Characteristics of Biodiesel Blend Oil in Diesel Engine (디젤기관에서 바이오디젤 혼합유의 배기배출물 특성에 미치는 연료분사시기의 영향)

  • Lim, Jae-Keun;Cho, Sang-Gon
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.36 no.5
    • /
    • pp.603-608
    • /
    • 2012
  • Recently we have a growing interest in environmental pollution and alternative energy. Diesel engine is generally used to produce the power on shore and sea. However, the combustion characteristics and exhaust emissions of the engine are changed on account of the wear of fuel system and the altered ambient condition of the combustion chamber by the increment of the engine operation hour. Therefore the combustion characteristics and exhaust emissions on the fuel injection timing were experimentally investigated to find out the optimum fuel injection timing in case of the about 20 years used diesel engine using biodiesel blend oil. The original fuel injection timing of the engine is BTDC $22^{\circ}$ CA. However, it is found that the optimum fuel injection as a result of analyzing the specific oil consumption and exhaust emissions of 20 years used the engine is BTDC $26^{\circ}$ CA.

A Study on the Effect of Automotive Engine Performance by Using Carbon Nano Colloid Cooling Water (탄소나노콜로이드 냉각수를 사용하여 자동차 엔진성능의 향상에 관한 연구)

  • Yi, Chung-Seob;Lee, Byung-Ho
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.19 no.5
    • /
    • pp.134-142
    • /
    • 2011
  • Although combustion is essential in most energy generation processes, it is one of the major causes of air pollution. Exhaust pipes with circular fin were designed to study the effect of cooling the recirculated exhaust gases (EGR) of Diesel engines on the chemical composition of the exhaust gases and the reduction in the percentages of pollutant emissions. The gases examined in this study were oxides of nitrogen (NOx), carbon dioxide ($CO_2$) and carbon monoxide (CO). In addition, $O_2$ concentration in the exhaust was measured. The designs adopted in this study were about exhaust pipes with solid and hollow fins around them direct surface force measurement in water using a nano size colloidal probe technique. The direct force measurement between colloidal surfaces has been an essential topic in both theories and applications of surface chemistry. As particle size is decreased from micron size down to true Carbon nano Colloid size (<10 nm), surface forces are increasingly important. Nano particles at close proximity or high solids loading are expected to show a different behavior than what can be estimated from continuum and mean field theories. The current tools for directly measuring interaction forces such as a surface force apparatus or atomic force microscopy (AFM) are limited to particles much larger than nano size. This paper use Water and CNC fluid at normal cooling system of EGR. Experimental result showed all good agreement at Re=$2.54{\times}10^4$ by free convection and Re=$3.36{\times}10^4$ by forced air furnace.

New Requirements of Environmental Standard for Aircraft Engine Exhaust Emissions (환경규제 강화에 따른 항공기 배기가스 배출기준 개정 방안 연구)

  • Noh, Ji-Sub;Kim, Kyeong-Su;Nam, Young-Woo
    • Journal of Aerospace System Engineering
    • /
    • v.14 no.spc
    • /
    • pp.7-12
    • /
    • 2020
  • In this paper the new revision of Korean Airworthiness Standards (KAS) - Emissions was proposed for enforced environmental standards. The Aircraft Engine Fuel Venting and Exhaust Emissions Requirements have been only defined for smoke, HC, CO and NOx as management items in previous KAS. However, this standard has not covered the current situation that International Civil Aviation Organization (ICAO) and United States Environmental Protection Agency (EPA) enforced environmental regulations, such as emissions trading system, limitation of CO2 emissions and restriction of exhaust gas. In order to overcome these outdated situations, we presented the new requirements for aircraft exhaust gas emissions standard of Korea based on the latest standards of United States, Europe and other countries.

Temporal distribution, influencing factors and pollution sources of urban ambient air quality in Nanchong, China

  • Zhou, Hong;Li, Youping;Liu, Huifang;Fan, Zhongyu;Xia, Jie;Chen, Shanli;Zheng, Yuxiang;Chen, Xiaocui
    • Environmental Engineering Research
    • /
    • v.20 no.3
    • /
    • pp.260-267
    • /
    • 2015
  • The $PM_{10}$, $SO_2$ and $NO_2$ mass concentrations were obtained over five years from monitoring stations across Nanchong, a southwest city in China. Changes in urban air quality over time, as well as the factors influencing that change, were evaluated based on air pollutant concentrations, the Air Pollution Index (API), and the Comprehensive Pollution Index (P). The results showed that the total annual mean $PM_{10}$, $SO_2$ and $NO_2$ concentrations over the five years studied were $61.1{\pm}1.1$, $45.0{\pm}3.9$ and $34.9{\pm}4.9{\mu}g{\cdot}m^{-3}$, respectively. The annual mean concentrations displayed a generally decreasing trend; lower than the annual mean second-level air quality limit. Meanwhile, the annual mean API values were in a small range of 52-53, the air quality levels were grade II, and P values were 1.06-1.21 less than the slight level ($P{\leq}1.31$). Total monthly mean $PM_{10}$, $SO_2$, $NO_2$ concentrations, and API and P values were consistently higher in winter and spring than during autumn and summer. The results of a correlation analysis showed that temperature and pressure were the major meteorological factors influencing pollution levels. Pollution sources included industrial coal and straw burning, automobiles exhaust and road dust, fireworks, and dust storms.