Sulfur behavior during coal combustion in oxy-fuel circulating fluidized bed condition by using TG-FTIR

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• 作者：Luning Tian^a ; ^b ; ^{tianluning@126.com" class="auth_mail" title="E-mail the corresponding author} ; Wei Yang^a ; ^{weiyang_4105@yeah.net" class="auth_mail" title="E-mail the corresponding author} ; Zhenhui Chen^a ; ^{chenzh4414@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Xianhua Wang^a ; ^{wxhwhhy@sina.com" class="auth_mail" title="E-mail the corresponding author} ; Haiping Yang^a ; ^{yhping2002@163.com" class="auth_mail" title="E-mail the corresponding author} ; Hanping Chen^a ; ^{hp.chen@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Coal ; Pyrolysis ; Combustion ; Oxy-fuel atmosphere ; Sulfur behavior ; TG-FTIR
• 刊名：Journal of the Energy Institute
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：89
• 期：2
• 页码：264-270
• 全文大小：1210 K

文摘

The sulfur behaviors of coal pyrolysis and combustion in air and oxy-fuel circulating fluidized bed (CFB) conditions showed that during coal pyrolysis, a significant increase of weight loss and CO emission were presented in CO₂ atmosphere at temperature above 900 K, then the increase of CO emission promoted the transformation of H₂S and other sulfur compounds to COS, and led more SO₂ emission by reduction of CaSO₄. The main sulfur-containing gas changed from H₂S in N₂ atmosphere to COS in CO₂ atmosphere. In oxy-fuel combustion, less SO₂, more H₂S and COS released compared with those in air combustion, the SO₂ became the main sulfur-containing gas. With the O₂ concentration increasing, more SO₂, COS and H₂S released at lower temperature by faster burning. As the particle size and heating rate increasing, the SO₂ and H₂S emission increased, and the COS emission decreased. Finally the comprehensive characteristics of sulfur behavior were proposed.