민코 아역청탄의 순산소 연소특성
Combustion Characteristics of Minco Sub-bituminous Coal at Oxy-Fuel Conditions
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New way to effectively capture CO2 in coal fired power plant is the combustion of coal using oxy-fuel technology. Combustion characteristics of Minco sub-bituminous coal at oxy-fuel conditions using TGA and drop tube furnace (DTF) were included activation energy about the char burnout, volatile yield and combustion efficiency of raw coal, the porosity of pyrolyzed char and fusion temperature of by-product ash. TGA result shows that the effect of CO2 on combustion kinetics reduces activation energy by approximately 7 kJ/mol at air oxygen level(21% O2) and decreases the burning time by approximately 16%. The results from DTF indicated similar combustion efficiency under O2/CO2 and O2/N2 atmospheres for equivalent O2 concentration whereas high combustion efficiency under O2/N2 than O2/CO2 was obtained for high temperature of more than 1,100℃. Overall coal burning rate under O2/CO2 is decreased due to the lower rate of oxygen diffusion into coal surface through the CO2 rich boundary layer. By-product ash produced under O2/CO2 and O2/N2 was similar IDT in irrelevant to O2 concentration and atmospheres gas during the coal combustion.
Abstract
New way to effectively capture CO2 in coal fired power plant is the combustion of coal using oxy-fuel technology. Combustion characteristics of Minco sub-bituminous coal at oxy-fuel conditions using TGA and drop tube furnace (DTF) were included activation energy about the char burnout, volatile yield and combustion efficiency of raw coal, the porosity of pyrolyzed char and fusion temperature of by-product ash. TGA result shows that the effect of CO2 on combustion kinetics reduces activation energy by approximately 7 kJ/mol at air oxygen level(21% O2) and decreases the burning time by approximately 16%. The results from DTF indicated similar combustion efficiency under O2/CO2 and O2/N2 atmospheres for equivalent O2 concentration whereas high combustion efficiency under O2/N2 than O2/CO2 was obtained for high temperature of more than 1,100℃. Overall coal burning rate under O2/CO2 is decreased due to the lower rate of oxygen diffusion into coal surface through the CO2 rich boundary layer. By-product ash produced under O2/CO2 and O2/N2 was similar IDT in irrelevant to O2 concentration and atmospheres gas during the coal combustion.
참고문헌 (13)
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