超临界水中葡萄糖气化制氢的热力学分析

引　言氢气是一种高效清洁的二次能源 ,具有无污染、可储存、可运输的特点 ,被公认为未来最有希望的能源载体 .在超临界水中进行生物质的气化制氢 ,气体产物中H2 的摩尔分数甚至可超过 5 0 % ,反应不生成焦油、木炭等副产品 ,不会造成二次污染 ,对于含水量高的湿生物质 ,不需要

THERMODYNAMICS ANALYSIS OF HYDROGEN PRODUCTION BY GLUCOSE GASIFICATION IN SUPERCRITICAL WATER

The conversion of biomass into hydrogen-rich gas provides a competitive means for producing clean energy and chemicals from renewable resources.Based on the principle of Gibbs free energy minimization, a new method was presented with better effectiveness and simplicity to be used for the prediction of chemical equilibrium composition of hydrogen production by biomass gasification in supercritical water(SCW).Applying this method to analyzing the process of glucose gasification in SCW, it was found that the product gas consisted primarily of hydrogen and carbon dioxide as well as a small amount of methane and carbon monoxide.The gas yield was strongly affected by reaction temperature and feedstock concentration and less affected by reaction pressure in the following range:temperature 623—1073 K,pressure 22.5—35 MPa,and concentration 0.1—0.8 mol•L^-1.The hydrogen production in product gas increased with the increase of temperature and decreased with the increase of concentration.