玉米芯与羧甲基纤维素钠的超临界水气化制氢  

Production of hydrogen from corncob/sodium carboxymethylcellulose gasification in supercritical water

作　　者：闫秋会[1] 闫静[1] 吕文贻[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《化学工程》2008年第4期57-60,共4页Chemical Engineering(China)

基　　金：陕西省教育厅专项科研计划项目(06JK253);西安建筑科技大学基础基金项目(JC0613);西安建筑科技大学人才项目

摘　　要：采用Gibbs自由能最小原理,建立了生物质超临界水气化制氢的化学平衡模型。将该模型应用于玉米芯/羧甲基纤维素钠(CMC)的超临界水气化制氢,分析模拟和实验结果,得到反应温度对化学平衡产物的作用如下:在300—374℃的亚临界区,气体产物的摩尔分数排序为x(CO2)>x(CH4)>x(H2),在375—420℃的低温超临界区,气体产物排序为x(CO2)>x(H2)>x(CH4),在420℃以上的高温超临界区,H2摩尔分数跃居最高,可达65%以上。较高的反应温度有利于提高H2的摩尔分数和气化率,但降低了气体的高热值。获得玉米芯/CMC制氢的最佳温度范围为420—600℃。表明农业废弃物的超临界水气化制氢是一种极具发展前景的能源转化新技术。Based on free energy minimum, a chemical equilibrium model was constructed to predict the performance of hydrogen production from biomass gasification in supercritical water （SCW）. By applying this model to analyze the processes of hydrogen production from corncob/sodium carboxymethylcellulose （CMC） in SCW, and analyzing simulation and experimental results, the influence of reaction temperature on product gases was obtained as follows： the order of product gases was x （ CO2 ） 〉 x （ CH4 ） 〉 x （ H2 ）, and x （ CO2 ） 〉 x （ H2 ） 〉 x （ CH4 ） at undercritical temperature area （300-374 ℃ ） and low supercritical temperature area （375-420 ℃ ）, respectively. H2 mole fraction rose to the highest in all product gases and reached in excess of 65% at high supercritical temperature area （ ≥420 ℃ ）. H2 mole fraction and gasification efficiency increased with the reaction temperature, but higher heating value decreased. Reasonable reaction temperature for hydrogen production for corncob/CMC was 420-600 ℃. It shows that hydrogen production from agricultural wastes gasified in SCW is a promising energy conversion technology.

关 键 词：化学平衡 制氢 超临界水 玉米芯/羧甲基纤维素钠 

分 类 号：TQ116.2[化学工程—无机化工]