• Title/Summary/Keyword: Low NOx Emission

Search Result 326, Processing Time 0.025 seconds

INFLUENCE OF OPERATION PATTERNS OF LIGHT-DUTY FREIGHT VEHICLES ON NOx POLLUTION AT LOCAL ROADSIDES

  • Saito, A.;Ueki, S.;Takada, Y.
    • International Journal of Automotive Technology
    • /
    • v.7 no.3
    • /
    • pp.269-276
    • /
    • 2006
  • Running tests on roads were conducted to clarify the influences of road infrastructure, traffic condition and vehicle's emission level to the amount of emission at local roadsides, and to reveal the operation patterns which can reduce the emission peaks. NOx emission peaks of two light duty freight diesel vehicles which have different emission levels were evaluated by using an on-board measurement system. Tests were carried out with various payload conditions and road conditions. As a result many NOx emission peaks were observed when the vehicles were starting or accelerating at intersections. The test vehicle which has higher emission level caused higher frequency and level of NOx emission peaks. Shifting up at lower engine speed in combination with lower acceleration brought out not only reduction of NOx emission peaks level but also of $CO_2$ mass emission.

The Study for Designs of Lean-Premixed low NOx Combustor (희박-예혼합 저 NOx 연소기 설계에 대한 연구)

  • Lim, Am-Ho;Kim, Han-Suck;Ann, Kuk-Young;Lee, Sang-Min;Kim, Yong-Mo
    • 한국연소학회:학술대회논문집
    • /
    • 2003.12a
    • /
    • pp.83-88
    • /
    • 2003
  • The concept of lean-premixed combustion in gas turbine combustor operation has become a standard in recent years as an effective means to meet stringent environmental standards on NOx emissions. Various types of air-fuel premixer, which affect greatly NOx emission and stability of lean-premixed low NOx combustor, were investigated experimentally to reduce the NOx emission. One type of the premixers is selected by experiments and applied it to 70kW class lean-premixed gas turbine combustor. The exit temperature and emissions of CO and NOx were measured with equivalence ratios at ambient pressure. From the results, the emissions of CO and NOx were influenced by the type of air-fuel premixer. As the mixing length of air and fuel is longer, the NOx and CO emission were decreased in the primary reaction zone. Compared with of conventional combustor, the lean-premixed low NOx combustor has low NOx emission characteristics.

  • PDF

The Evaluation of NOx Emission Factor from Large Combustion Facilities in Seoul (서울지역 대형연소시설에서의 질소산화물 배출계수 산정)

  • 조기찬;최종욱;박후경;유병태
    • Journal of environmental and Sanitary engineering
    • /
    • v.15 no.4
    • /
    • pp.78-83
    • /
    • 2000
  • The emission factor of nitrogen oxides(NOx) was evaluate to clarify the characteristics of NOx emitted from seven large combustion facilities in seoul area. The emission factors of NOx at A-1 and A-2 facilities of internal combustion engine were 66.957kgNOx/ton and 20.913kgNOx/ton, respectively. The emission factor of A-1 facility was higher than that of A-2 facility even same internal combustion engine, because A-1 facility adopted SCR(selective catalystic reactor) for reduction of NOx emission factor of A-2, A-4, and A-7 power generation boiler facilities were 4.300kgNOx/ton, 2.460kgNOx/ton and 1.796kgNOx/ton, respectively. The capacity of A-2 facility was about two times than that of A-4 and A-7. These emission factors were lower than those at facilities in other areas of korea, because of using low NOx burner of power generation boiler. The emission factors of NOx at A-3 and A-6 incinerator facilities were 0.147kgNOx/ton and 0.221kgNOx/ton which were lower than other facilities, respectively, because these facilities incinerate municipal solid waste of low heating value and uwe SCR for reducing NOx concentration.

  • PDF

A Study on Characteristics of Exhaust Emissions from Domestic Used Diesel Engines (國産 디이젤機關의 汚染物質 排出特性에 關한 硏究)

  • 趙康來;金良均;董宗仁;嚴明道
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.1 no.1
    • /
    • pp.83-92
    • /
    • 1985
  • In odrder to survey the emission level of air pollutants from diesel vehicles, was measured CO, HC, NOx and smoke of 4 types of domestic-use diesel engines under various conditions. The emission of CO, HC and NOx tested by 6-Mode test method and smoke emission by full load test met the permissible vehicle emission standard. Pollutant emission rates of diesel engines were different according to engine operating conditions, that is, engine load and engine speed. Generally, CO and HC was emitted more at low load and NOx at high load but the trend was quite different by the type of engines. In exhaust gas, $NO_2$ portion of NOx emission was high, specially at low speed and low load. The correlation equation between CLD(NOx) and NDIR(NO) method of nitrogen of nitrogen oxides analysis was y = 1.10x - 3.48 (y: CLD method) as a result of 6-mode test.

  • PDF

NOx and CO Emission Characteristics of Premixed Oxidizer-staging Combustor using a Cyclone Flow (싸이클론 유동을 이용한 예혼합 다단연소기의 NOx 및 CO 배출특성)

  • Kim, Jong-Hyun;Lee, Hyun-Yong;Hwang, Cheol-Hong;Lee, Chang-Eon
    • Journal of the Korean Society of Combustion
    • /
    • v.13 no.2
    • /
    • pp.7-13
    • /
    • 2008
  • The aim of this work is to identify application of ultra low NOx and CO combustor. To achieve this, we developed the premixed oxidizer-staging combustor using a cyclone flow. Various factors such as equivalence ratio for the combustion condition and swirl type for secondary air injection have been tested experimentally for flame stability and NOx, CO emission characteristics. Before to do this, we had been tested cyclone premixed combustor in advance. it is similar to first combustor of premixed oxidizer-staging combustor. As a result, cyclone premixed flame shows the very high flame stability and low NOx emission. however, it can be identified that there were some problems such as a little high CO emission and thermal resistance of combustor wall. Cyclone premixed oxidizer-staging combustor can resolve those of problems. In our combustor, we can found out optimal condition that the secondary air injection method is swirl type, swirl direction is co-swirl and equivalence ratio of first combustor is 1.3. Quantitatively, we can achieve 10.8 ppm for NOx and 30.2 ppm for CO emissions respectively. Form this result, we can identified that cyclone premixed oxidizer-staging combustor can apply to ultra low NOx and CO combustor.

  • PDF

Numerical & Experimental Study For Burner of Low NOx Formation of Multi-Stage In a Combustor (연소기에서의 다단 저 NOx 버너의 수치 및 실험적 연구)

  • Choi, Yun-Ki;Kang, Kyung-Tae;Kim, Young-Mo
    • 한국연소학회:학술대회논문집
    • /
    • 2003.12a
    • /
    • pp.65-74
    • /
    • 2003
  • Air pollution included Nitric Oxide(NOx) from heating boilers is increased by pursuing better life. Development of low NOx emission boiler is strongly needed. However commercial burner for heating boiler is also asked to be thermal efficient and low-cost manufactuable in addition to low NOx emission. Small space for combustor including burner is usually allowed. In this study, parametric study of compact low NOx burner for heating boiler was done using numerical analysis and experiments. Commerical computational fluid dynamic(CFD) program named CFX 5-6 was used for numerical analysis of low NOx burner using turbulent diffusion flame. Comparison of outlet NO and outlet temperature under various equivalence ratio and fuel flow rate was performed between experiment and numerical analysis.

  • PDF

NOx Reduction Characteristics of Air Staging Burner for Pulverized-coal Combustion (공기 다단공급식 미분탄 버너의 NOx 저감 특성)

  • Park, Chu-Sik;Kim, Sung-Won;Choi, Snag-Il
    • 한국연소학회:학술대회논문집
    • /
    • 2001.11a
    • /
    • pp.153-160
    • /
    • 2001
  • The combustion test used DTF was performed to obtain the characteristics of NOx emission and reduction. In this test, major factor of NOx emission was a stoichiometric air ratio. At the onset of combustion to be rich oxygen, NOx was produced rapidly. Optimum condition for NOx reduction was formed under about AR:0.7 in the combustion test of Alaska coal. Investigations were undertaken with 200KW(th) test combustor. In combustion test, the major variables were coal feed ratio of center/outer, stoichiometric air ratio at the onset of combustion. The lowest NOx emission, 182ppm(6% O2 base), was achieved at about AR:0.6 of the first combustion stage with low NOx burner. Also, unburned carbon content of char collected in this combustion condition was about 1wt%.

  • PDF

An Experimental Study on the Combustion Characteristics in Low Emission Multi-Staged Oil Burner (다단연소를 이용한 저 NOx 버너의 연소특성에 관한 연구)

  • An, Guk-Yeong;Kim, Han-Seok;Jo, Eun-Seong
    • 연구논문집
    • /
    • s.27
    • /
    • pp.101-108
    • /
    • 1997
  • The characteristics of combustion and emissions in multi-staged oil burner have been experimentally studied for the various range of equivalence ratios, drop sizes and fuel formulations. Malvern system was used to measure droplet size of fuel. Light fuel oil and light fuel oil doped with pyridine($C_5H _5N$) were used to investigate the effects on fuel NOx emission. The emissions of NO and CO in exhaust gas and the flame temperatures were measured by the gas analyzer and thennocouples. NOx emissions were increased by increasing the excess air ratio (range:$lambda=1.1-1.4$) or decreasing the SMD of droplet in single-staged burner. In comparison with the single-staged burner, the emission of NOx in multi-staged burner was reduced by 50% but CO emission was slightly increased. It is found that multi-staged burner has a good capability in reducing thermal NOx resulting from the distributed heat release rate and lower flame temperature in fuel-rich and fuel-lean combustion zone. Moreover, the fuel NOx emission of the multi-staged burner is lower than that of single-staged burner, because multi-staged burner has fuel rich zone where fuel N is converted to $N_2$ more than NO. In 3-staged burner, the percentage of each stage combustion air have strong influence on emission characteristics. It is also found that NOx emission can be reduced by decreasing inner and outer air percentage or increasing middle air flow rate and CO emission is vice versa.

  • PDF

A Study on the Conversion Performance of Lean NOx Trap for a 4-stroke Diesel Engine (4기통 디젤엔진에서의 Lean NOx Trap 촉매 정화 특성에 관한 연구)

  • Han, Joon-Sup;Oh, Jung-Mo;Lee, Ki-Hyung;Lee, Jin-Ha
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.19 no.2
    • /
    • pp.78-83
    • /
    • 2011
  • Diesel engine has many advantages such as high thermal efficiency, low fuel consumption and low emission of CO2. However, the diesel engine faced with strengthened emission regulation about NOx and PM. To suppress NOx emission, after-treatment systems such as Lean NOx Trap (LNT), Selective Catalytic Reduction (SCR) are considered as a more practical strategy. This paper investigated the performance of Lean NOx trap of the 4 stroke diesel engine which had a LNT catalyst. Characteristic of exhaust emission at NEDC mode was analyzed. From this result, the effect of nozzle attaching degree, injection quantity and gas flow change on NOx conversion performance was clarified.

A Study on Low Emission Pulverized Coal Combustion in the 2 Staged Coaxial Cyclone Combustor (2단 동축형 Cyclone 연소기를 이용한 저공해 미분탄 연소특성 연구)

  • Choi, Sang-Il;Park, Chu-Sik;Kim, Sung-One;Kim, Ho-Young
    • Journal of the Korean Society of Combustion
    • /
    • v.4 no.1
    • /
    • pp.67-83
    • /
    • 1999
  • The objective of this study is development of low emission pulverized coal combustor for reducing pollutant emission generated from coal combustion. Low emission combustion technology for reducing NOx and fly ash was investigated by using 2 stage coaxial cyclone combustor. Staged combustion was employed for NOx reduction and high temperature slagging combustion was also studied for fly ash removal in the combustor. The result of this study shows that the low emission combustion system can reduce the amount of atmospheric pollutions with improved boiler efficiency and performance.

  • PDF