Abstract: A Cu-Zn-Al/HZSM-5 catalyst was used for dimethyl ether (DME) synthesis from a synthetic gas containing nitrogen, which was produced by pine sawdust air-steam gasification combined with biogas reforming. The obtained N2-containing synthetic gas was used directly for DME synthesis. About 67% CO in a single run of conversion and 0.358 g/(g×h) (DME/catalyst per hour) yield could be achieved under the conditions of 280℃, 4 MPa and 1000~4000 h-1. Over 90% carbon content in the biomass could be converted to synthetic gas by reforming biomass fuel gas together with biogas (CH4). The maximum DME yield was 0.244 kg/kg (DME/biomass).

Key words: biomass, synthesis, dimethyl ether, thermochemical method

摘要： 在鼓泡流化床反应器内，采用空气-水蒸汽气化松木粉制备了富氢燃气，在下游的固定床重整反应器内，通过添加沼气重整富氢燃气，调变化学当量比，制备了含氮的生物质合成气. 在Cu-Zn-Al/HZSM-5催化剂上，对生物质合成气一步法合成二甲醚进行了实验研究. 在280℃, 4 MPa, 1000~4000 h-1的条件下，CO的单程转化率达到67%，单位质量催化剂的最大二甲醚时空收率0.358 g/(g×h) [DME/(催化剂×h)]；通过添加沼气重整，90%以上的生物质碳转化为合成气，二甲醚的最大产量为0.244 kg/kg (DME/生物质).

关键词: 生物质, 合成, 二甲醚, 热化学法