基于CO2原位捕集的生物质热解制氢

摘要

Using ricehusk as raw materials,CaO as a capture agent,the change of combustible gases in different temperature and different proportion of capture agent in-situ CO2 capture was investigated. The results showed that the pyrolysis gas production was significantly affected by temperatures,and there was maximum gas production of 340mL/g at 800℃. CaO sorbents promoted the reaction towards forming more hydrogen by in-situ CO2 capture.At 600℃,with CO2 concentration at 22%,the CO2 capture had nothing to do with CaO proportion. At CaO:biomass =1:4 in 700℃,the higher H2yield 41% and the lower CO2 yield 16% were abtained. And the CO2capture efficency was 64%. The GC-MS analysis showed that CaO played the role of catalytic cracking instead of temperature.%以谷壳作为生物质研究对象,在石英管反应器中研究了基于CO2原位捕集的谷壳热解制H2,考察了不同温度、不同的CO2捕集剂(CaO)配比对其热解的产气量、气体中H2的体积分数的影响.实验结果表明,谷壳热解的产气量随温度的升高而增大,当反应温度在800℃时有最大产气量340mL/g;捕集剂 CaO 的添加通过原位吸收CO2促进相关反应向生成氢气的方向移动.在600℃,不同比例CaO下CO2体积分数都保持在22%左右,谷壳热解产生的气体中H2的体积分数为14%~26%;在700℃,当CaO与生物质质量比为1:4时,添加CaO捕集剂能够较好地捕集CO2,有效提高H2的体积分数,此时获得较高的H2产率41%,较低的CO2体积分数16%, CaO的捕集率为64%;GC-MS表征分析发现,CaO在800℃的温度下对热解过程中产生的焦油有部分催化裂解效果.