Theoretical Study of Coal Gasification in a 50 ton/day HYCOL Entrained Flow Gasifier. I. Effects of Coal Properties and Implications

A three-dimensional computational fluid dynamics simulator was developed to study hydrogen-from-coal (HYCOL) coal gasification theoretically. The simulator developed has satisfactory sensitivity to various coal properties, including C/H ratio, C/O ratio, volatile matter content, ash content, heating value, and particle size when simulating coal gasification in an oxygen-blown HYCOL gasifer. Among the coal properties investigated, the heating value had a strong influence on the gasification characteristics of a HYCOL gasifier, whereas the influence of particle size was limited, suggesting a very likely reaction regime of chemical reaction control in the gasification process. The trajectory and temperature distribution were quite different for particles of different sizes, which may be useful information to avoid ash slagging in the gasifier.

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