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무촉매 및 등온 반응조건에서 여러 가지 석탄 챠의 수증기 가스화 반응특성
Kinetics of Non-Catalytic Steam Gasification of Various Coal Chars under Isothermal Condition
HWAHAK KONGHAK, June 1992, 30(3), 292-302(11), NONE
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Abstract
국산 무연탄, 중구산 역청탄 및 인도네시아산 갈탄으로부터 얻은 char들과 기준시료인 활성탄을 원료로 사용하여 수증기 가스화 반응을 시키고, 이들의 가스화 반응특성을 비교검토하였다. 가스화 반응은 상압하의 고정층 반응기 내에서 650-1000℃의 온도범위와 0.1-0.7 기압의 수증기 분압범위에서 행하였으며, 가스화 반응속도는 반응의 생성기체를 분석하여 구하였다. 석탄 char의 가스화 반응속도는 미반응 수축핵모델(unreacted shrinking core model)에 잘 일치하였으며, 반응속도는 char의 전환율이 5-15% 일 때 최대였고, 이 때 측정된 표면적도 최대값을 보였다. 탄화도가 낮은 탄종의 char가 저온에서 반응활성이 좋았고, 반응온도가 상승하면서 역청탄의 반응속도가 현저히 증가하였다. CO2/CO, H2/CO 몰비와 CO생성의 활성화에너지는 탄화도가 증가할수록 감소하였다.
Steam gasification of three different coal chars and activated carbon has been carried out in a fixed-bed reactor under the conditions of 650-1000℃ and 0.1-0.7atm of steam. Three sample coale are Korean Jangsung anthracite, Chinese Tatong bituminous and Indonesian lignite. The gasification rate, estima-ted from G.C. analysis of the product gases, increases initially in parallel with the surface area of the reacting char, reaching the maximum when the carbon conversion is about 5-15%. Mechanism of the char gasification is well represented by the unreacted shrinking-core model. Chars of the lower-rank coals exhibit relatively fast gasification rates at low temperatures, but the bituminous coal char shows a significant increase in the gasification rate at higher temperatures. The CO2/CO and H2/CO molar ratios among the products and the activation energy of CO formation decrease with increasing rank of the sample coals.
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