关键词: 高温空气气化, 固定床, 工艺参数

Abstract: The high temperature air/steam as gasifying agent was applied in gasification of coal with a 200 mm internal diameter fixed bed gasifier. The effects of process parameters such as temperature of gasifying agent, gasification temperature, ratio of air to coal and ratio of steam to coal on gasification performance were studied. The experimental results indicated that the gas heat value increased 32.5% with the temperature of air from 500℃ to 800℃. The increase in gasification temperature availed the gasification process, but its increase was limited by the melting point of ash in the condition of solid slag emission. The effects of ratio of air to coal and ratio of steam to coal on coal gasification performance were realized by changing the gasification temperature, and the two parameters had an optimum operating range for a certain fixed bed coal gasification process. In the experimental conditions, they should be controlled in the ranges from 1.55 to 1.8 Nm3/kg and from 0.25 to 0.35 kg/kg, respectively.

Key words: high temperature air gasification, fixed bed, process parameters