抄録
Melting characteristics of coal ash depend on coal brand. Its accurate evaluation is necessary for long-term stable operation of gasifier of IGCC. But conventional measurement of melting point is done in the mixture gas of CO and CO_2,which is not similar to actual syn gas. Moreover, the effect of gas composition on ash melting behavior has not been clarified yet. Then, it is not clear if conventional method can evaluate melting behavior in actual gasifier. In this paper, new index, named RCP, was defined to evaluate progress of ash melting behavior. Effect of reducing gas composition on ash melting behavior was also clarified. The ash of 4 brands of coal, gasified in CO_2,are examined their melting characteristics in mixed gas, whose composition was calculated by equilibrium calculation in view of syn gas. Results of melting experiments suggested that melting behavior could predict from coal ash composition.
