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Korean Chemical Engineering Research,
Vol.42, No.3, 355-361, 2004
Vol.42, No.3, 355-361, 2004
공기 산화 공정을 이용한 저 유황 석탄의 연소 전 탈황 특성
Desulfurization Characteristics of Low Sulfur Coals Prior to Combustion using Air Oxidation Process
본 연구에서는 4종류의 저 유황 석탄을 대상으로 연소 전 탈황 공정인 공기 산화 공정을 적용하여 탈황 특성을 파악하고 최적의 탈황 조건을 구하였다. 공기 산화 공정에서 적정 탈황조건은 반응시간 15-20분, 반응온도 500-550 ℃이였으며 이 조건에서 탈황율은 유연탄이 28.7-50.8 %, 무연탄이 23.4-54.8 %였다. 입경이 탈황율에 미치는 영향은 미미하였으며, 석탄 char의 발열량은 분석오차를 감안하며 변화가 없는 것으로 판단되었다. 모든 석탄에서 무기황 탈황율이 높게 나타나 공기 산화 공정은 유기황보다 무기황 제거에 더 효과적인 것으로 생각되었다. 스팀 첨가시 탈황율이 2-3% 증가하였으며 스팀 첨가에 의한 발열량 증가는 유연탄보다 무연탄에서 더 크게 나타났다.
Desulfurization characteristics of low sulfur coals prior to combustion were studied using air oxidation process. The optimum desulfurization condition for the air oxidation process was obtained when experiments were carried out for 15-20 minutes at 500-550 ℃. Sulfur removal efficiencies for bituminous and anthracite coals were in the range 28.7-54.1% and 23.4-50.0%, respectively. The effect of particle size of the coals on desulfurization efficiencies was proved to be insignificant. In the air oxidation process, changes of heating values after treatment were negligible within the experimental error. When steam was added to reduce the loss of carbon to the oxidation process, the sulfur removal efficiency of coals increased 2-3% and the heating value of anthracite coals was higher than that for bituminous ones.
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