| O2/H2O燃烧方式下石灰石的间接硫化反应特性 |
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| 引用本文： | 吕晨,刘小伟,郭俊哲,张鹏辉,徐明厚.O2/H2O燃烧方式下石灰石的间接硫化反应特性[J].化工学报,2017,68(1):353-359. |
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| 作者姓名： | 吕晨 刘小伟 郭俊哲 张鹏辉 徐明厚 |
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| 作者单位： | 华中科技大学煤燃烧国家重点实验室, 湖北 武汉 430074 |
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| 基金项目： | 国家自然科学基金项目（51476064）；国家重点基础研究发展计划项目（2013CB228501）。 |
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| 摘 要： | 利用水平管式炉和热重实验台架，对O2/H2O、O2/N2和O2/CO2 3种不同燃烧方式下石灰石的间接硫化反应特性进行了研究。重点探究了燃烧方式、水蒸气浓度对石灰石间接硫化反应的影响规律与机理。同时，对硫化产物进行了X射线荧光光谱（XRF）、X射线衍射（XRD）、孔结构特性和扫描电镜（SEM）分析。结果表明，O2/H2O燃烧方式相比于相同氧浓度下的O2/N2和O2/CO2燃烧方式，石灰石间接硫化反应的钙转化率在化学反应控制阶段基本相同，在扩散控制阶段O2/H2O燃烧方式下的钙转化率有显著的提高。主要原因是水蒸气促进了硫化反应后期产物层内的固态离子扩散。此外，O2/H2O燃烧方式下，不同的水蒸气浓度对石灰石的钙转化率基本没有影响。
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| 关 键 词： | 温室气体 二氧化碳捕集 O2/H2O燃烧 固定床 石灰石 间接硫化 SO2 |
| 收稿时间： | 2016-09-06 |
| 修稿时间： | 2016-10-29 |
Indirect sulfation characteristics of limestone under O2/H2O combustion atmosphere |
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| L&#,Chen,LIU Xiaowei,GUO Junzhe,ZHANG Penghui,XU Minghou.Indirect sulfation characteristics of limestone under O2/H2O combustion atmosphere[J].Journal of Chemical Industry and Engineering(China),2017,68(1):353-359. |
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| Authors: | L&# Chen LIU Xiaowei GUO Junzhe ZHANG Penghui XU Minghou |
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| Affiliation: | State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China |
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| Abstract: | A tube furnace(TF) and thermogravimetric analyzer(TGA) were used to investigate the indirect sulfation of limestone under O2/H2O combustion compared with O2/N2 and O2/CO2 combustion.It focused on the effects of combustion atmosphere and steam concentration on the calcium conversion ratio of the limestone.Besides, the sulfated products were collected for X-ray fluorescence(XRF), X-ray powder diffraction(XRD), pore structure characteristics and scanning electron microscopy(SEM) analysis.The results indicate that the indirect sulfation reaction has a negligible difference at the kinetically-controlled stage under different atmosphere but it is greatly enhanced at the diffusion-controlled stage under O2/H2O atmosphere compared with O2/N2 and O2/CO2 atmosphere.This is due to the fact that the presence of steam promotes the solid-state diffusion in the product layer.Besides, the calcium conversion ratio has no obvious increase when increasing the concentration of steam under O2/H2O atmosphere. |
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| Keywords: | greenhouse gas CO2 capture O2/H2O combustion fixed-bed limestone indirect sulfation SO2 |
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