Release and transformation characteristics of K and Cl during straw torrefaction and mild pyrolysis

被引:112
作者
Chen, Handing
Chen, Xueli [1 ]
Qiao, Zhi
Liu, Haifeng
机构
[1] E China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, Shanghai 200237, Peoples R China
关键词
Torrefaction; Potassium; Chlorine; Release; CFA; VOLATILE-CHAR INTERACTIONS; VICTORIAN BROWN-COAL; ASH-FORMING ELEMENTS; GAS-PHASE; LIGNOCELLULOSIC BIOMASS; WOOD COMBUSTION; SOLID FUELS; WHEAT-STRAW; CHLORINE; ALKALI;
D O I
10.1016/j.fuel.2015.11.059
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The release and transformation characteristics of K and Cl during straw torrefaction and mild pyrolysis under different conditions were investigated. The results show that release ratio of Cl increased continuously with temperature and holding time and the release of Cl was linearly proportional to devolatilization. The particle size was one of most important factors influencing Cl release. The release ratio for 74-124 mu m straw particle was 60.78%, which was much higher than 27.25% for 250-420 mu m at 350 degrees C. The influence of sample weight, particle size and heating rate was mainly due to secondary reactions of oncereleased Cl and pyrolysis char (the AAEMs and carbon active sites) during the diffusion process of volatiles. The influence of secondary reactions on K release and transformation behavior was not significant. The reaction intensities of KCl and macromolecules (cellulose, lignin, xylan and pectin) were different. The release of Cl was not generally equal to the fractions of K transformed into ion-exchanged species and released to the gas phase during KCl-loaded macromolecules torrefaction and mild pyrolysis, mainly due to different intensities of their secondary reactions. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:31 / 39
页数:9
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