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HWAHAK KONGHAK,
Vol.30, No.6, 749-759, 1992
Vol.30, No.6, 749-759, 1992
석탄 촤-수증기 가스화반응에서 K-Fe, Na-Fe, Na-Fe-Ca 혼합물의 촉매효과
Catalytic Activity of K-Fe, Na-Fe, Na-Fe-Ca Mixtures on Char-Steam Gasification
알칼리염(K2CO3, K2SO4, Na2CO3), 철금속염(FeSO4), 알칼리토금속(CaCO3, limestones)으로 이루어진 여러 가지 혼합물들이 char-수증기 가스화반응을 온도 700-800℃ 하에서 열천칭반응기에서 수행할 때의 촉매활성을 측정하였고, 혼합염들이 반응가스 분위기하에서 나타내는 용융특성도 함께 조사하였다. 철금속염을 부가함에 따라 알칼리염을 촉매로한 가스화반응속도는 향상되었으며, 두 가지 염의 혼합에 따른 효과는 800℃에서 가장 크게 나타났다. 준역청탄의 가스화반응에서는 (K2SO4+FeSO4)를 준-무연탄의 경우에는 (Na2CO3+FeSO4)를 사용하여 K2CO3보다 나은 촉매활성을 얻을 수 있었다. Na-Fe-Ca 혼합시스템의 경우 Ca-계 첨가재의 종류에 따른 소성속도가 가스화반응속도를 좌우하였다. 여러 가지 촉매의 활성을 간단히 비교해 볼 수 있는 척도로서 grain model 로부터 하나의 kinetic parameter를 제시하였다.
The catalytic activity of various mixtures of alkali salts(K2CO3, K2SO4, Na2CO3), iron salt(FeSO4) and alkaline earth metals(CaCO3 and two limestones) on steam-char gasification at 700-800℃ has been meas-ured in a thermobalance reactor. The melting behavior of the mixed salts at the reaction atmosphere has the largest effectiveness of the mixed salts on the gasification rate can be attained at 800℃. In the gasification of subbituminous char with (K2SO4+FeSO4) and semi-anthracite char with (Na2CO3+FeSO4) exhibit better catalytic activity than those with K2CO3. The gasification rate with Na-Fe-Ca mixed systems strongly depends on calcination rate of the Ca-based additives. A kinetic parameter is proposed as a simple measure of activity of various catalysts based on the grain model.
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