Ca（OH）2对生物质水蒸气气化制氢的影响.pdfVIP

第41卷第i2期 上 海 交 通 大 学 学 报 Vo1．41 No．12 2007年 12月 J()URNAI OF SHANGHAI JIA()TONG UNIVERSITY Dec．2007 文章编号：1006—2467(2007)12—1930 04 Ca(O H)2对生物质水蒸气气化制氢的影响 黄 浩， 胡国新 (上海交通大学 机械与动力工程学院，上海 200240) 摘 要：提出一种新型的生物质水蒸气气化制氢方法．该方法在生物质水蒸气气化过程中添加 COz吸收剂，旨在通过吸收CO 促进产氢反应向着氢气产生方向进行，从而提高产氢量．分析了 Ca(OH)。、水蒸气、温度和保持时间对产氢量以及产气组分百分比的影响，结果表明：在生物质水 蒸气气化过程中添加c() 吸收剂能显著提高产氢量；随着Ca(OH) 的增加产氢量先升高后略微 降低，Ca(OH) 对水煤气反应的影响要明显强于对甲烷水蒸气重整反应的影响；产氢量随水蒸气 的增加先升高后降低；产氢量随温度的升高迅速增加；充足的保持时间可以使制氢反应进行彻底． 关键词：生物质；CO 吸收剂；水蒸气气化；制氢 中图分类号：TK 6 文献标识码：A The Influence of Ca(OH)2 on Hydrogen Production frOm B iomass by Steam Gas ification HUANG Hao， HUGuo xin (School of Mechanical Eng．，Shanghai Jiaotong Univ．，Shanghai 200240，China) Abstract：A novel hydrogen production in which Ca(()H)2 is adopted as a CO2 sorbent to increase H2 yield in the process of hydrogen production from woody biomass by steam gasification was proposed．The influ— ences of the amount of Ca(OH) and steam，reaction temperature，and holding time on H2 yield and gas composition were investigated．The experimental results show that H2 yield increases significantly under the catalysis of Ca(OH)2．With the increasing of the amount of Ca(()H)2，H2 yield increases firstly，and then decreases slightly．Furthermore，Ca(OH)2 has a stronger effect on water gas shift reaction than on steam reforming of methane．Higher temperature contributes to more hydrogen production ． The introduc— tion of steam greatly increases H2 yield．However，excessive steam would lower gasification temperature and H2 yield．In addition，enough holding time is necessary for hydrogen p