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International Journal of Automotive Technology > Volume 9(5); 2008 > Article
International Journal of Automotive Technology 2008;9(5): 563-570.
REACTION CHARACTERISTICS OF THE DIESEL OXIDATION CATALYST OF PARTICULATE MATTERS FROM THE DIFFUSION FLAME OF A BOILER BURNER
H. N. KIM, T. J. KIM, B. C. CHOI, M. T. LIM
Chonnam National University
ABSTRACT
The objective of this experimental study is to investigate the characteristics of the size distribution and the number concentration of PM (Particulate matter) emitted from the diffusion flame of a boiler burner, which has the same type of combustion as a diesel engine. This study is performed to investigate the emission characteristics of nanoparticles generated from the diffusion combustion in diesel fuel, and it considered fuel factors and the reaction characteristics of the nanoparticle on the DOC (Diesel oxidation catalyst). The factors examined in this experiment included the sulfur content in fuel, the blend diesel fuel containing biodiesel and bio-ethanol, and the concentration of engine oil (0.1 % and 1.0 %) blended with diesel fuel. The particle size distribution of nanoparticles exhausted from the boiler burner was measured by an SMPS (scanning mobility particle sizer). The number concentration of PM smaller than 70 nm in diameter greatly increased in the rear of the DOC, when fuel containing 250 ppm of sulfur was used. The experiment also suggested that the particle number concentration in both the front and rear of the DOC was lower when ULSD (ultra low sulfur diesel) fuel blended with biodiesel and bio-ethanol, which are oxygenated fuels, was used than when only ULSD fuel was used. The higher the content of engine oil in the fuel, the higher the particle number concentration was in the front and rear of the catalyst. When the first dilution air temperature is increased from 30℃ to 180℃, the nanoparticle number concentration dramatically dropped in the rear of the catalyst when fuel containing 250 ppm of sulfur was used, while the particle size distribution remained almost the same when the fuel with engine oil was used.
Key Words: Diffusion flame, PM (particulate matters), DOC (diesel oxidation catalyst), SMPS (scanning mobility particle sizer), Biodiesel fuel, Ethanol, Engine oil
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