EXPERIMENTAL STUDY ON GASIFICATION CHARACTERISTICS OF COAL WITH HIGH ASH FUSION TEMPERATURE IN LAB-SCALE DOWN-FLOW GASIFIER
At present, the commercial entrained flow coal gasifiers were all slagging gasifiers and their applicability of coal were restricted in high ash fusion temperature coal. The high ash fusion temperature coal with FT>1400℃ is accounted for about 55％ of annual coal production and 57％ of retain coal reserves in China. For the purpose of extending the applicability of coal and developing new entrained flow coal gasification technology by using high ash fusion temperature coal with dry ash out, the high ash fusion temperature coal gasification characteristics were studied by using around 25kg/h lab-scale entrained flow gasification experimental system at temperature range from 1300℃ to below ash fusion temperature which was suitable for dry ash out. The results showed that the gasification temperature is increased with the increasing of O/C molar ratio. The high temperature is favorable to the gasification reaction to move for the direction of endothermic reaction but higher content of oxygen can get higher content of CO2 and lower content of CO and H2.The cold gas efficiency will be decreased when the O/C molar ratio is too high. Under the experimental conditions the optimal O/C molar ratio range is from 1.0 to 1.2 and corresponding gasification temperature range is from 1300℃ to 1350℃. The cold gas efficiency can get the highest, around 42％, and the carbon to gas conversion is around 90％ when the gasification temperature is around 1350℃. Under this condition the ash in the bottom of gasifier and cyclone is existed as solid in the view of overall except some little parts are melted in the size of several μm. And the ash in the bag filter has not been melted. Due to the melted part is accounted for very little percentage in the whole ash. The tendency of slagging is small and will not meet slagging and jam problems at the exit of coal ash.
High ash fusion temperature coal entrained flow Gasification characteristics dry ash out
Xiaojiang WU Zhongxiao ZHANG Guilin PIAO Nobusuke KOBAYASHI Shigekatsu MORI Yoshinori ITATYA Guoyan CHEN
Department of Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, Department of Chemical Engineering, Nagoya University, Nagoya 464-8603, Japan
国际会议
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)
武汉
英文
111-115
2007-12-01（万方平台首次上网日期，不代表论文的发表时间）