Study of Coal Gasification Using High Ash Fusion Temperature Coal in an Entrained Flow Gasifier

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In conventional entrained coal gasification, coal ash is usually discharged from the bottom as molten slag. Therefore, comparatively low ash fusion temperature coal is preferred. However, high ash fusion temperature coal contributes 30% of total world coal production, so a new gasification process has been proposed. We conducted a dry ash removal gasification experiment in an entrained down-flow gasifier using different ash fusion temperature coal. We measured gasification temperature and composition and volume of produced gas to evaluate the gasification behavior. Recovered ash was analysed to evaluate ash behavior. The performance and trend among gasification conditions were similar regardless of coal type, but ash behavior significantly varied depending on ash fusion temperature. Even when gasification temperature was similar, fly ash predominated if high ash fusion temperature coal was used, but ash adhered to the entrained gasifier wall as fouling when low ash fusion temperature coal was used.

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