Abstract
Experimental study using a 2T/D air-blown pressurized two-stage entrained flow coal gasifier was initiated in 1983. Various tests and research efforts with the gasifier have been conducted to investigate the characteristics of coal gasification, slag discharge, etc. Sixteen bituminous coals have been tested and the total gasification time (as of August 1989) has reached 1500 hours. This report presents the experimental test results on the coal gasification characteristics for 5 typical coals. As a result of the gasification tests, it should be noted that steady discharge of molten slag was accomplished under air-blown conditions also for high-ash-melting coals. The HHV of the product gas, cold gas efficiency, and carbon conversion efficiency were highly dependent on the air ratio and the carbon recycle rate. The per pass carbon conversion efficiency and the amount of product char were affected by the gasifier air ratio and the coal types.
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