Distribution of sulfur in chemical looping combustion of anthracite based on Fe-based oxygen carrier

doi:10.11949/j.issn.0438-1157.20170838

Abstract

Abstract:

In a batch fixed bed reactor, distribution of sulfur was studied during chemical looping combustion of anthracite based Fe₂O₃/Al₂O₃ oxygen carrier(OC). Reduction temperature and content of Fe₂O₃ were tested as variables. The work showed that the carbonaceous gas quantity increased with increasing temperature, while it increased first and then decreased with content of Fe₂O₃ improved. The proportion of CO₂ reached the highest value 37.6% at 850℃ and there were no SO₂ detected at experiments. At 2 h, the occupation of sulfur in OC increased with improvement of both temperature and the content of Fe₂O₃. At 5.5 h, the occupation of sulfur in OC decreased obviously with improvement of temperature. Surface microstructure of reacted OC was also evaluated using a scanning electron microscope. The results showed that OC sintered gradually with increase of content of Fe₂O₃.

Key words: chemical looping combustion, anthracite, Fe-based oxygen carrier, sulfur

摘要：

在间歇式固定床反应器上，基于Fe₂O₃/Al₂O₃载氧体，研究了还原阶段反应温度和Fe₂O₃负载量对无烟煤化学链燃烧产物及S元素分布的影响。研究结果表明，含碳气体释放量随反应温度升高而增加，随Fe₂O₃负载量先增加后减少。产物中CO₂比例随反应温度升高先增加后减少，在850℃时达到最高（37.6%）。在实验条件下，未检测到SO₂生成。反应2 h时，载氧体中S元素的富集程度随温度和Fe₂O₃负载量升高而增加；5.5 h时，载氧体中S元素分布比例随温度升高而显著降低。利用SEM分析了载氧体表面微观形态结构。分析表明，Fe₂O₃负载量大于40%会导致载氧体轻微烧结。

关键词: 化学链燃烧, 无烟煤, 铁基载氧体, 硫

CLC Number:

TK16

ZHANG Zhifeng, WANG Yifei, ZHU Longchu, LI Jilin, WANG Fuchen, YU Guangsuo. Distribution of sulfur in chemical looping combustion of anthracite based on Fe-based oxygen carrier[J]. CIESC Journal, 2018, 69(4): 1578-1585.

张志丰, 王亦飞, 朱龙雏, 李季林, 王辅臣, 于广锁. 基于铁基载氧体的无烟煤化学链燃烧过程中硫分布特性[J]. 化工学报, 2018, 69(4): 1578-1585.

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