中文摘要：

CaO具有良好的CO2吸收性能且对焦油裂解有促进作用，可实现污泥气化制取富氢气体，是无害化处理污泥的一种方式，具有较好的应用前景。本文以3A分子筛和TiO2为载体，分别对CaO进行改性，制取了CaO-3A、CaO-TiO2和CaO-TiO2-3A三种碳载体，研究了不同温度下其作为CO2碳载体对污泥气化特性的影响。实验结果表明：钙基碳载体和气化温度对污泥气化影响显著，添加碳载体以及提高气化温度均有利于提高H2产量和污泥能量转换效率；CaO-TiO2-3A性能表现优越，气化温度650℃时，H2浓度高达84.2%，碳转化率最高达46%；气化温度850℃时，H2产量和能量转换率最高。研究表明，CaO-TiO2-3A碳载体具有优越的污泥催化制氢性能。

英文摘要：

CaO can be used to absorb CO2and to promote the tar cracking in sludge gasification to produce hydrogen-rich gases.Gasification of CaO-sewage sludge is a promising alternative technology to use sewage sludge and to reduce the secondary pollutions.In this work,3A molecular sieve and TiO2were used as the supports to modify CaO.Three CO2sorbents were prepared:CaO-3A molecular sieve,CaO-TiO2,and CaO-TiO2-3A molecular sieve.The effects of modified CaO as the CO2sorbents on the gasification of sewage sludge in a fixed bed reactor were studied at different temperatures.The experimental results showed that the increase of gasification temperature and the addition of the CO2sorbents could both promote the H2production and energy conversion rate.Among the three modified CaO CO2sorbents,CaO-TiO2-3A exhibited the highest H2yield and energy conversion rate.With the CaO-TiO2-3A sorbent,the concentration of H2reached84.2%and the carbon conversion rate was46%at650℃.The experiments results showed that CaO-TiO2-3A appeared to have the best adsorption and hydrogen production performances.