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The roles of iron-based additives on the sulfur evolution during lignite pyrolysis
TIAN Jilin #,FU Chunhui,WANG Meijun,SHEN Yanfen,WANG Peng,CHANG Liping *
Taiyuan University of Technology, Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, TaiYuan 030024
*Correspondence author
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Funding: Research Project Supported by Shanxi Scholarship Council of China （No.2014-028）, Shanxi Graduates Innovation Project of China （No.tyut-rc201366a）, Research Fund for Doctoral Program of High Education （No.No. 20111402110009）, National Natural Science Foundation of China（No.21406152）, Shanxi Province Basic Conditions Platform for Science and Technology Project （No.No. 2012091018）
Opened online: 9 February 2015
Accepted by: none
Citation: TIAN Jilin,FU Chunhui,WANG Meijun.The roles of iron-based additives on the sulfur evolution during lignite pyrolysis[OL]. [ 9 February 2015] http://en.paper.edu.cn/en_releasepaper/content/4631462
 
 
The effects of two iron-based additives (ferric acetate and ferrous oxalate) in a Chinese lignite with high organic sulfur samples without and with demineralization on the sulfur evolution from coal pyrolysis have been studied with a fixed bed quartz reactor in argon atmosphere. The results show that the inherent mineral matters as well as iron-based additives inhibit the formation of hydrogen sulfide and carbonyl sulfide. Two iron-based additives with 3wt% Fe are added to the raw and demineralized coal by mechanical mixing method, and the effects of two iron additives on the sulfur evolution during coal pyrolysis are different. Both inherent mineral matters and iron-based additives have positive effects on the retention of sulfur in char. But the releasing behaviors of S-containing gases in the pyrolysis of ferrous oxalate loaded samples are different from that of ferric acetate loaded samples. This can be attributed to the difference of decomposition products of two different kinds of iron-based additives, which have different reaction behaviors with S-containing species. The inherent mineral matters and two kinds of iron-based additives have better catalytic role in promoting the sulfur converting into larger molecules form of sulfide in liquid phase products. The ferrous oxalate plays a better role than ferric acetate in this process.
Keywords:pyrolysis; lignite; iron-based addictive; hydrogen sulfide; carbonyl sulfide; sulfur evolution
 
 
 

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