O2/H2O燃烧方式下石灰石的间接硫化反应特性

doi:10.11949/j.issn.0438-1157.20161246

化工学报 ›› 2017, Vol. 68 ›› Issue (1): 353-359.DOI: 10.11949/j.issn.0438-1157.20161246

O₂/H₂O燃烧方式下石灰石的间接硫化反应特性

吕晨, 刘小伟, 郭俊哲, 张鹏辉, 徐明厚

华中科技大学煤燃烧国家重点实验室, 湖北武汉 430074

收稿日期:2016-09-06 修回日期:2016-10-29 出版日期:2017-01-05 发布日期:2017-01-05
通讯作者: 刘小伟
基金资助:
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）。

Indirect sulfation characteristics of limestone under O₂/H₂O combustion atmosphere

LÜ Chen, LIU Xiaowei, GUO Junzhe, ZHANG Penghui, XU Minghou

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China

Received:2016-09-06 Revised:2016-10-29 Online:2017-01-05 Published:2017-01-05
Contact: 10.11949/j.issn.0438-1157.20161246
Supported by:
supported by the National Natural Science Foundation of China (51476064) and the National Basic Research Program of China (2013CB228501).

摘要/Abstract

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。

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

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.

Key words: greenhouse gas, CO₂ capture, O₂/H₂O combustion, fixed-bed, limestone, indirect sulfation, SO₂

中图分类号:

X511

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.

LÜ Chen, LIU Xiaowei, GUO Junzhe, ZHANG Penghui, XU Minghou. Indirect sulfation characteristics of limestone under O₂/H₂O combustion atmosphere[J]. CIESC Journal, 2017, 68(1): 353-359.

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O₂/H₂O燃烧方式下石灰石的间接硫化反应特性

Indirect sulfation characteristics of limestone under O₂/H₂O combustion atmosphere

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