锯木屑在超临界水中气化制氢过程的主要影响因素

INFLUENCE OF MAIN PARAMETERS ON WOOD SAWDUST GASIFICATION IN SUPERCRITICAL WATER

以锯木屑混合羧甲基纤维素钠 (CMC)为反应原料 ,利用连续管流反应器 ,在反应器外壁面温度稳定在 6 5 0℃条件下 ,对反应压力在 17 5～ 30MPa,反应停留时间在 14 4～ 5 0s,浓度范围为 4 %～ 9% (质量分数 )的湿生物质浆液进行了超临界水气化制氢实验研究 ,讨论了气化过程的主要参数压力、温度、反应停留时间以及物料浓度对气化结果的影响 .锯木屑在超临界水中接近完全气化 ,生成气体产物的主要成分是H2 、CH4、CO、CO2 以及少量的C2 H4和C2 H6,气化产物中的H2 含量可以超过 4 0 % .同时 ,实现了气化反应液体产物的循环利用 .

Hydrogen is gaining increasing attention as an encouraging future energy. Thermochemcial gasification of biomass in supercritical water has been identified as a promising approach to producing renewable hydrogen. The raw biomass feedstock of wood sawdust mixed in sodium carboxymethylcellulose (CMC) was gasified at a pressure range from 17.5 MPa to 30 MPa and 650°C in a tubular flow reactor with a reactor residence time of 14.4-50 s. The influence of the main parameters (pressure, temperature, residence time and concentration of solution) on wood sawdust gasification was investigated. Wood sawdust was gasified almost completely. The product gas was composed of hydrogen, carbon dioxide, methane, carbon monoxide and a small amount of ethane and ethylene. The molar fraction of hydrogen in excess of 40% was reached. Results from the experiments showed that recycling liquid effluent was possible.