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The roles of iron-based addtives on the formation of NH3 and HCN during brown coal pyrolysis
FU Chunhui 1 #,WANG Meijun 2,REN Xiurong 2,CHANG Liping 2 *
1.Taiyuan University of Technology, Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, TaiYuan 030024
2.Taiyuan University of Technology, Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province
*Correspondence author
#Submitted by
Subject:
Funding: Doctoral Program of High Education （No.No. 20111402110009）, National Natural Science Foundation of China （No.No. 21176165）, Shanxi Province Basic Conditions Platform for Science and Technology Project （No.No. 2012091018）
Opened online:25 June 2013
Accepted by: none
Citation: FU Chunhui,WANG Meijun,REN Xiurong.The roles of iron-based addtives on the formation of NH3 and HCN during brown coal pyrolysis[OL]. [25 June 2013] http://en.paper.edu.cn/en_releasepaper/content/4548346
 
 
Pyrolysis of a Chinese lignite with high organic sulfur has been studied with a fixed bed quartz reactor to examine the effects of iron-based additive on the release of NH3 and HCN. During the pyrolysis of this low rank coal, the yield of HCN is dramatically increased through demineralization by HCl/HF washing, the release amount of NH3 is slightly increased and the content of nitrogen in char nearly unchanged, indicating that the inherent minerals influence significantly the secondary reactions of volatiles rather than the breakage of nitrogen species with large ring structure in char. 3wt% Fe with different precursors was added to the raw and demineralized coal by mechanical mixing method, and the effect of iron additive on the nitrogen transferring routes during coal pyrolysis varies with the precursors of additive. Both the additions of ferric acetate and ferrous oxalate in coal with and without demineralization decrease the release of HCN apparently during pyrolysis due to catalyze the secondary reactions of volitiles. But the ferrous oxalate decreases also the yield of NH3, which should be because the carbon dioxide from the decomposition of oxalate groups in the heating process can be adsorbed on the active sites relative to nitrogen and hydrogen to restrain the combination of nitrogen and hydrogen and make the nitrogen-containing species transforming to macromolecule structure in char.
Keywords:lignite; pyrolysis; iron-based additives; NH3; HCN
 
 
 

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