中文摘要：

在一个2段式生物质热解气化装置上考察了钙基催化吸收剂对玉米秸秆制氢特性的影响,结果表明：CaO添加可原位吸收气化过程中生成的CO_2,强化制氢过程向生成更多H_2的方向移动。当热解气化温度为650℃、S/B为2、CaO/C摩尔比为1时,产气中H_2体积分数从28.7%上升至56.2%,H_2产率则从64.3 m L/g上升至195.8 m L/g,而CO_2体积分数由21.5%下降至1.1%。而且,CaO的CO_2吸收强化性能与气化温度密切相关,在600~700℃范围内,玉米秸秆热解气化可获得很高的H2体积分数和较高的H2产率。以CaO吸收剂为载体进一步引入Ni O活性组分,可降低产气中小分子碳氢气体,提高产气中的H2体积分数和产率。在NiO负载量为10%时,产气中H2体积分数可达63.7%,而H_2产率对比添加CaO时则接近翻倍,达到了341.3 m L/g。

英文摘要：

The influence of calcium-based catalyst / absorbent on hydrogen production of corn stalk pyrolysis-gasification was investigated in a two-stage fixed-bed biomass pyrolysis-gasification system. the results showed that addition of CaO could in-situ absorb CO_2 generated from the gasification process,thus enhanced the gasification process to form more H_2. As the pyrolysis / gasification temperature was 650°C,mass ratio of steam to biomass（ S / B） was 2,and molar ratio of CaO to C was 1,compared with the trail without CaO addition,H_2 concentration in the product gas was increased greatly from 28. 7% to 56. 2%,H_2 yield was increased from 64. 3 m L / g to 195. 8 m L / g,while CO_2 concentration was decreased sharply from 21. 5% to 1. 1%. CaCO_3 could be found in the used absorbent after gasification,which further proved the enhancing effect of CaO addition. Moreover,the enhancing effect of CO_2 absorption of CaO was closely related to the gasification temperature. High H_2 concentration and yield could be obtained with gasification temperature in the range of 600℃ to 700℃ from the pyrolysis-gasification of corn stalk.As gasification temperature higher than 700℃,the CO_2 absorption capability of CaO was weakened,CaO mainly acted as a catalyst during the gasification process. The introduction of active NiO to CaO absorbent could decrease the content of small molecular hydrocarbon gases in the product gas,and increase the H_2 concentration and yield. With Ni O loading of 10% on CaO,H_2 concentration in product gas could achieve 63. 7%,while H_2 yield was close to double of that with CaO addition,which reached 341. 3 m L / g.