碱/碱土金属浸渍对酸洗生物质热解影响研究

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摘要

为研究碱/碱土金属(AAEM)浸渍预处理对酸洗生物质热解特性的影响，本文选用稻壳、橡木和秸秆3种生物质为原样，对酸洗及酸洗后5种金属硝酸盐（KNO3，Ca(NO3)2，Mg(NO3)2，Fe(NO3)3，Ni(NO3)2）溶液浸渍样进行热重分析。结果表明：酸洗使得生物质中金属含量降低，而浸渍预处理使生物质中金属含量增加；经酸洗后生物质的TG和DTG曲线向高温方向移动，最大热解速率明显增加，焦炭产量下降；AAEM盐浸渍预处理可以促进生物质的热解过程，使生物质的TG和DTG曲线向低温移动；Fe、K、Ni盐的反应活性稍高于Ca、Mg盐。从动力学方面看，Coats-Redfern法对150~340 ℃范围内生物质热解均有很好的相关性，反应级数为一级，金属的添加使生物质热解所需活化能降低，对热解具有催化作用。

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Abstract：

In order to understand the catalytic effect of alkali and alkaline earth metal (AAEM) salts on the pyrolysis characteristics of biomass, three typical biomass samples, namely rice husks, oak and corn stalks, were washed by acid and subsequently impregnated with different metal nitrate salts, including KNO3, Ca(NO3)2, Mg(NO3)2, Fe(NO3)3 and Ni(NO3)2. The products were investigated by thermogravimetric analysis. The results showed that acid washing could reduce the metal content of the biomass. After acid washing, the TG and DTG curves of the biomass were shifted to higher temperature, the maximum pyrolysis rate increased significantly, and the char yield decreased. AAEM salts could catalyze the pyrolysis process and shifted the TG and DTG curves of the biomass to lower temperature. Fe, K, and Ni salts showed higher reactive activities than Ca and Mg salts. In terms of pyrolysis kinetics, the Coats-Redfern method applied to biomass pyrolysis at 150-340℃ had a high correlation and the pyrolysis process can be described by a first-order reaction kinetics model. The adding of AAEM salts can lower the activation energy of biomass in pyrolysis and catalyze the pyrolysis process, and is thus beneficial to biomass pyrolysis.

收稿日期: 2015-01-13 出版日期: 2015-09-20

PACS:	O643.3
	TQ203.8
	TQ353.4

通讯作者: 刘广青

引用本文:

刘金淼; 马欣欣; 黄燕; 何艳峰; 刘广青. 碱/碱土金属浸渍对酸洗生物质热解影响研究[J]. , 2015, 42(5): 24-31.
LIU JinMiao; MA XinXin; HUANG Yan; HE YanFeng; LIU GuangQing. The effects of alkali/alkaline earth metal impregnation pretreatment on the pyrolysis characteristics of biomass. , 2015, 42(5): 24-31.

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http://www.journal.buct.edu.cn/CN/ 或 http://www.journal.buct.edu.cn/CN/Y2015/V42/I5/24

［1］黄承洁, 姬登祥, 于平, 等. Mg2+ 作用下水稻秸秆热裂解特性及动力学模拟［J］. 农业工程学报, 2011, 27(增刊1): 118-124. Huang C J, Ji D X, Yu P, et al. Pyrolysis characteristics and kinetic modeling of rice straw with additives of Mg2+［J］. Transactions of the CSAE, 2011, 27(Supp1): 118-124. （in Chinese)
［2］王树荣, 骆仲泱. 生物质组分热裂解［M］. 北京: 科学出版社, 2013: 156-157. 
Wang S R, Luo Z Y. Pyrolysis of biomass components［M］. Beijing: Science Press, 2013: 156-157. （in Chinese)
［3］Fan C, Yan J W, Huang Y R, et al. XRD and TG-FTIR study of the effect of mineral matrix on the pyrolysis and combustion of organic matter in shale char［J］. Fuel, 2015, 139(1): 502-510. 
［4］Wang H, Srinivasan R, Yu F, et al. Effect of acid, alkali, and steam explosion pretreatments on characteristics of bio-oil produced from pinewood［J］. Energy ＆ Fuels, 2011, 25(8): 3758-3764. 
［5］胡海涛, 李允超, 王贤华, 等. 生物质预处理技术及其对热解产物的影响综述［J］. 生物质化学工程, 2014, 48(1): 44-50. 
Hu H T, Li Y C, Wang X H, et al. A review of biomass pretreatment technologies and their influences on pyrolysis products［J］. Biomass Chemical Engineering, 2014, 48(1): 44-50. （in Chinese)
［6］杨昌炎, 姚建中, 吕雪松, 等. 生物质中K+、Ca2+对热解的影响及机理研究［J］. 太阳能学报, 2006, 27(5): 496-502. 
Yang C Y, Yao J Z, Lu X S, et al. The effect of K+, Ca2+ in biomass on the pyrolysis and mechanism research［J］. Acta Energiae Solaris Sinica, 2006, 27(5): 496-502. （in Chinese)
［7］谭洪, 王树荣. 酸预处理对生物质热裂解规律影响的实验研究［J］. 燃料化学学报, 2009, 37(6): 668-672. 
Tan H, Wang S R. Experimental study of the effect of acid-wash pretreatment on biomass pyrolysis［J］. Journal of Fuel Chemistry and Technology, 2009, 37(6): 668-672. （in Chinese)
［8］王树荣, 廖艳芬, 文丽华, 等. 钾盐催化纤维素快速热裂解机理研究［J］. 燃料化学学报, 2004, 32(6): 694-698. 
Wang S R, Liao Y F, Wen L H, et al. Potassium catalytic on fast cellulose pyrolysis［J］. Journal of Fuel Chemistry and Technology, 2004, 32(6): 694-698. （in Chinese)
［9］Shimada N, Kawamoto H, Saka S. Different action of alkali/alkaline earth metal chlorides on cellulose pyrolysis［J］. Journal of Analytical and Applied Pyrolysis, 2008, 81: 80-87. 
［10］Collard F X, Blin J, Bensakhria A, et al. Influence of impregnated metal on the pyrolysis conversion of biomass constituents［J］. Journal of Analytical and Applied Pyrolysis, 2012, 95: 213-226. 
［11］Keown D M, Hayashi J, Li C Z. Effects of volatile-char interactions on the volatilisation of alkali and alkaline earth metallic species during the pyrolysis of biomass［J］. Fuel, 2008, 87(7): 1187-1194. 
［12］Davidsson K O, Korsgren J G, Pettersson J B C, et al. The effect of fuel washing techniques on alkali release from biomass［J］. Fuel, 2002, 81(2): 137-142. ［13］辛芬. 预处理对生物质热解特性影响的试验研究［D］. 武汉: 华中科技大学, 2006. 
Xin F. Experimental study on the influence of pretreatment on biomass pyrolysis characteristics［D］. Wuhan: Huazhong University of Science & Technology, 2006. （in Chinese)
［14］胡亿明. 木质生物质各组分热解过程和热力学特性研究［D］. 北京: 中国林业科学研究院, 2013. 
Hu Y M. Pyrolysis process and thermodynamic characteristics of lignocellulosic biomass components［D］. Beijing: Chinese Academy of Forestry Sciences, 2013. （in Chinese)
［15］王树荣, 廖艳芬, 刘倩, 等. 酸洗预处理对纤维素热裂解的影响研究［J］. 燃料化学学报, 2006, 34(2): 179-183. 
Wang S R, Liao Y F, Liu Q, et al. Experimental study of the influence of acid wash on cellulose pyrolysis［J］. Journal of Fuel Chemistry and Technology, 2006, 34(2): 179-183. （in Chinese)
［16］Patwardhan P R, Satrio J A, Brown R C, et al. Influence of inorganic salts on the primary pyrolysis products of cellulose［J］. Bioresource Technology, 2010, 101(12): 4646-4655. 
［17］Nowakowski D J, Jones J M. Uncatalysed and potassium-catalysed pyrolysis of the cell-wall constituents of biomass and their model compounds［J］. Journal of Analytical and Applied Pyrolysis, 2008, 83: 12-25. 
［18］Ma Z Q, Chen D Y, Gu J, et al. Determination of pyrolysis characteristics and kinetics of palm kernel shell using TGA-FTIR and model-free integral methods［J］. Energy Conversion and Management, 2015, 89: 251-259. 
［19］刘耀鑫, 陈炜, 卢红伟. 稻壳催化热解特性及动力学研究［J］. 热力发电, 2011, 40(4): 53-56. 
Liu Y X, Chen W, Lu H W. Study on behavior and kinetics of catalytic pyrolysis for rice husk［J］. Thermal Power Generation, 2011, 40(4): 53-56. （in Chinese)
［20］车德勇, 李少华, 张锐, 等. 稻壳热解特性及动力学研究［J］. 电站系统工程, 2012, 28(4): 5-7. 
Che D Y, Li S H, Zhang R, et al. Study on the pyrolysis and pyrolysis kinetics of rice husk［J］. Power System Engineering, 2012, 28(4): 5-7. （in Chinese)