Chemical looping gasification of waste activated carbon for hydrogen-enriched syngas production

doi:10.11949/j.issn.0438-1157.20170409

Abstract

Abstract:

The optimum reaction condition for hydrogen-enriched syngas production from waste activated carbon with Fe4ATP6 as oxygen carrier (OC) in chemical looping gasification (CLG) was investigated in high-temperature batch fluidized bed. It was demonstrated that Fe4ATP6 exhibited good reactivities during CLG process, and it had double effect of catalysis and lattice oxygen providing, which could enhance the carbon conversion rate and the gasification reaction rate. The optimum reaction condition was resulted to be 900℃, steam flow rate of 0.25 g·min^-1, and OC/C ratio of 1. Under the optimum reaction condition, 55.30% of H₂ average concentration, 1.09 L·g^-1 of H₂ yield, 1.20 L·g^-1 of syngas production and 92.15% of carbon conversion were achieved. The reactivity of Fe4ATP6 decreased slightly as a function of ten redox tests. Surface morphology and composition of Fe4ATP6 were analyzed by SEM and XRD, respectively. The results indicated that the structure of Fe4ATP6 changed significantly, while its particle size decreased slightly. In addition, unreactive iron silicates were found to be generated in Fe4ATP6 during the ten redox tests.

Key words: waste activated carbon, chemical-looping gasification, hydrogen-enriched syngas, oxygen carrier, redox test

摘要：

以废弃活性炭为原料，以Fe4ATP6复合载氧体为载氧体，在间歇高温流化床中考察了废弃活性炭化学链气化制富氢合成气反应的较优条件及复合载氧体的循环反应特性。结果表明，Fe4ATP6复合载氧体具有提供晶格氧及催化气化的双重作用，显著提高了碳转化率，促进了废弃活性炭气化过程，反应活性良好。废弃活性炭化学链气化制富氢合成气的优化反应条件：900℃、水蒸气流量为0.25 g·min^-1、OC/C比为1。在上述条件下，碳转化率达92.15%，合成气产量达1.20 L·g^-1，其中H₂产量为1.09 L·g^-1，平均浓度为55.30%。10次循环实验表明Fe4ATP6复合载氧体的反应活性略有降低，通过SEM、XRD分析载氧体的表面形貌、物质组成发现，载氧体反应后结构变化较大，粒径减小，生成了无反应活性的硅酸铁。

关键词: 废弃活性炭, 化学链气化, 富氢合成气, 载氧体, 循环实验

CLC Number:

TK6
X705

WANG Bo, LIU Yongzhuo, WANG Dongying, GUO Qingjie. Chemical looping gasification of waste activated carbon for hydrogen-enriched syngas production[J]. CIESC Journal, 2017, 68(9): 3541-3550.

王博, 刘永卓, 王东营, 郭庆杰. 废弃活性炭化学链气化制富氢合成气[J]. 化工学报, 2017, 68(9): 3541-3550.

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