碱金属钾对麦秆水蒸气气化制取富氢气体影响  

Influence of the K on Hydrogen-rich Gas Production in the Steam Gasification of Wheat Straw

作　　者：曾志伟[1] 邹俊[1] 李斌[1] 王贤华[1] 杨海平[1] 陈汉平[1] 

机构地区：[1]煤燃烧国家重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《中国电机工程学报》2017年第5期1434-1440,共7页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973计划)(2013CB 228102);国家自然科学基金项目(51376076;51306066)~~

摘　　要：主要研究碱金属盐对生物质催化气化制氢的影响。以K_2CO_3为催化剂研究气化温度和水蒸气生物质比对麦秆水蒸气气化影响时发现在低温、低水蒸气量条件下,K_2CO_3对麦秆热解的催化作用占主导地位;随气化温度和S/B的增加,K_2CO_3对麦秆焦的水蒸气气化催化作用逐渐增强,在700℃、S/B为4时达到最大,得到最大H_2浓度和产量;随气化温度继续增加,K_2CO_3和SiO_2反应生成没有催化作用的、低熔点的钾盐,导致K_2CO_3逐渐失活,在800℃时由于灰的熔融甚至抑制麦秆的水蒸气气化制氢。不同赋存形式的钾盐对麦秆的水蒸气气化有不同的催化效果,K_2SO_4和KCl都会抑制氢气生成而促进焦炭产生;与此相反,K_2CO_3和CH_3COOK都会显著促进麦秆的水蒸气气化制取氢气,并且K_2CO_3的催化效果要优于CH_3COOK。The influence of the alkali-metal salts on hydrogen production in the steam gasification of biomass was researched. The addition of K2CO3 was used to investigate the effect of the temperature and the stearn/biomass mass ratio on wheat straw steam gasification. The results show that the K2CO3 dominantly catalyze the pyrolysis of wheat straw in the low temperature and the low steam mass. The catalysis of the steam gasification of wheat straw coke gradually increases with the rise of the temperature and S/B and achieves optimum catalytic effect in the temperature of 700℃ and the S/B of 4 which could get the maximum concentration and yield of H2. As the gasification temperature continued to increase, the catalytic effect of K2CO3 would gradually decrease because of the reaction between K2CO3 and SiO2 which would form no catalytic and low melting pointing＇s alkali-metal salt. The ash melt even restrains the production of H2 in the steam gasification of wheat straw when the temperature increases to 800~C. The catalytic effect of different K salts on hydrogen production in the steam gasification ofbiomass was researched. There are different effects with different salts. K2SO4 and KC1 restrain the hydrogen production and promote the char generation. In contrast, K2CO3 and CH3COOK would significantly promote the hydrogen production in the steam gasification of wheat straw and the catalytic effect of K2CO3 was superior to CH3COOK.

关 键 词：碱金属 麦秆 水蒸气气化 氢气 

分 类 号：TK6[动力工程及工程热物理—生物能]