Indirect sulfation characteristics of limestone under O2/H2O combustion atmosphere

doi:10.11949/j.issn.0438-1157.20161246

Abstract

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

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

CLC Number:

X511

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.

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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Indirect sulfation characteristics of limestone under O₂/H₂O combustion atmosphere

O₂/H₂O燃烧方式下石灰石的间接硫化反应特性

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