生物质气化重整合成二甲醚
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摘要: 以松木粉为原料，采用空气水蒸气气化制备了富氢气化气，通过添加甲烷重整富氢气化气，调整了合成气化学当量比，在260 ℃、4 MPa、12 000 h－1条件下，对生物质合成气一步法合成二甲醚进行了实验研究。结果表明：引入甲烷重整，活化了富氢气化气中过量的CO2，甲烷的最佳加入量为CH4/CO2=1，生物质碳转化率达到70%以上，尾气中二甲醚选择性达到69.6%。Abstract: The hydrogen-rich syngas produced by air-steam gasification of pine sawdust at 800 ℃ was used for direct dimethyl ether (DME) synthesis. The raw syngas contained large amount of CO2. The stoichiometric adjustment can be accomplished by CH4-CO2 dry reforming reaction with addition of CH4 under the condition of 700 ℃，0.1 MPa. The H2/CO ratio could be adjusted from 1.5 to 2.0. The content of CO2 and CH4 in the exit gas from the reforming reactor was below 3 mol%. The optimized CH4 addition rate was CH4/CO2=1. The results of DME synthesis from biomass syngas under the condition of 260 ℃,4 MPa,12 000 h－1 showed that biomass carbon conversion was above 70% and the selectivity to dimethyl ether in the synthesis reaction was 69.6%.
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Key words:
- biomass /
- synthesis /
- dimethyl ether
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