The Erdos bituminous coal is gasified with K2CO3 as the catalyst in supercriticai water (SCW) using a batch tank reactor.The effects of temperature, H2O/coal ratio, and amount of K2 CO3 loadings are tested and investigated.Experimental results indicate that temperature has significant effect on the coal conversion and gas yield, and both the conversion rate and gas yield increase with increasing temperature; greater water/coal ratio can increase the coal conversion rate and gas yield, but the effect is less profound as the water/coal ratio increases; in the range of the catalyst loading between 5 ％-20 ％ coal, the coal conversion increases appreciably with increasing catalyst loading amount.In this investigation, the optimum operating conditions are found at 650 ℃, 25 MPa, coal particle size within the range of 80 mesh-150 mesh, water/coal mass ratio of 20∶1, and K2CO3 concentration of 20％coal, and the coal conversion, gas yield,hydrogen yield, and methane yield are 84％, 3 000 mL/g daf coal, 1 900 mL/g daf coal and more than 450 mL/g daf coal respectively.%以鄂尔多斯烟煤为例,利用间歇反应釜,在超临界水条件下考察了反应温度、水煤比以及K2CO3添加量等因素对煤气化反应的影响.结果表明,温度对煤的转化率和气相收率有重要影响,且转化率和气相收率随温度的升高而增加;增加水煤比会提高煤转化率和气相收率,但其对气体组成和煤转化率影响的幅度随水煤比的增加而减小;在5%～20%(质量分数)煤催化剂添加条件下,煤转化率随催化剂添加量的增加而迅速增加.在研究考察范围内,煤颗粒尺寸在80目～150目范围内,最佳的反应条件是:反应温度为650℃,水煤比为20∶1,K2CO3添加量为20%(质量分数)煤.相应的反应结果是:煤转化率达到84%以上,气相收率高于3 000 mL/g daf coal,其中氢气收率为1 900 mL/g daf coal,甲烷收率为450 mL/g daf coal.
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