Effects of 3A molecular sieve and TiO2 supported CaO on the gasification of sewage sludge

doi:10.16085/j.issn.1000-6613.2017-0238

Abstract

Abstract: CaO can be used to absorb CO₂ and 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 TiO₂ were used as the supports to modify CaO. Three CO₂ sorbents were prepared:CaO-3A molecular sieve,CaO-TiO₂_,and CaO-TiO₂-3A molecular sieve. The effects of modified CaO as the CO₂ sorbents 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 CO₂ sorbents could both promote the H₂ production and energy conversion rate. Among the three modified CaO CO₂ sorbents,CaO-TiO₂-3A exhibited the highest H₂yield and energy conversion rate. With the CaO-TiO₂-3A sorbent,the concentration of H₂ reached 84.2% and the carbon conversion rate was 46% at 650℃. The experiments results showed that CaO-TiO₂-3A appeared to have the best adsorption and hydrogen production performances.

Key words: sewage sludge, gasification, calcium oxide, absorbents, waste treatment

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。

关键词: 污泥, 气化, 氧化钙, 碳载体, 废物处理

CLC Number:

X703

ZHANG Qi, WANG Genbao, LI Meng, ZHANG Lei, CHEN Shiyi, XIANG Wenguo. Effects of 3A molecular sieve and TiO₂supported CaO on the gasification of sewage sludge[J]. Chemical Industry and Engineering Progress, 2017, 36(10): 3697-3703.

张琪, 汪根宝, 李蒙, 张磊, 陈时熠, 向文国. 基于3A分子筛和TiO₂载体的钙基碳载体对污泥气化的影响[J]. 化工进展, 2017, 36(10): 3697-3703.

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Effects of 3A molecular sieve and TiO₂supported CaO on the gasification of sewage sludge

基于3A分子筛和TiO₂载体的钙基碳载体对污泥气化的影响

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