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A Study of Co-Combustion Characteristics of North Korean Anthracite and Bituminous Coal in 2 MWe CFBC Power Plant  

Han, Keun-hee (Greenhouse Gas Research Center, Korea Institute of Energy Research)
Hyun, Ju-soo (Greenhouse Gas Research Center, Korea Institute of Energy Research)
Choi, Won-kil (Greenhouse Gas Research Center, Korea Institute of Energy Research)
Lee, Jong-seop (Greenhouse Gas Research Center, Korea Institute of Energy Research)
Publication Information
Korean Chemical Engineering Research / v.47, no.5, 2009 , pp. 580-586 More about this Journal
Abstract
In this study, co-combustion characteristics of Chinese bituminous coal and North Korean anthracite were investigated using a 2 MWe scale circulating fluidized bed power plant. At first, the combustion efficiency of bituminous coal of China and Australia as a function of excess air ratio and temperature were observed. The results showed that the combustion efficiency was influenced by particle size and volatile content of coal, the combustion efficiency of Chinese bituminous coal was over 99.5%. The unburned carbon particles from fly ash and bottom ash were a content 5~7% and 0.3%, respectively. The combustion efficiency with the mixture ratio 20% of bituminous coal and anthracite decreased over 5% because of the increase of entrained particles by a small average particle size of anthracite in the combustor. However, the outlet concentration of $SO_2$ and $NO_x$ was not changed remarkably. The concentrations of the typical air pollutants such as $NO_x$ and $SO_2$ were 200~250 ppm($O_2$ 6%), 100~320 ppm($O_2$ 6%) respectively. The outlet concentration of $NO_x$ was decreased to 30~65% with $NH_3$ supplying rate of 2~13 l/min in SCR process. The $SO_x$ removal efficiency was up to 70% by in-furnace desulfurization using limestone with Ca/S molar of approximately 6.5. With wet scrubbing using $Mg(OH)_2$ as absorbent, the $SO_x$ removal efficiency reached 100% under near pH 5.0 of scrubbing liquid.
Keywords
Circulating Fluidized Bed; Coal Combustion; Flue Gas; Emission; Co-Combustion;
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