中药渣固废的碳酸钾催化热解特性与产物分布规律  

PYROLYSIS CHARACTERISTICS AND PRODUCT DISTRIBUTION OF HERB RESIDUES CATALYZED BY POTASSIUM CARBONATE

作　　者：方刚 郎林[2] 杨辛苗 阴秀丽[2] 王明峰 吴创之 Fang Gang;Lang Lin;Yang Xinmiao;Yin Xiuli;Wang Mingfeng;Wu Chuangzhi(School of Engineering Science,University of Science and Technology of China,Hefei 230026,China;CAS Key Laboratory of Renewable Energy,Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China)

机构地区：[1]中国科学技术大学工程科学学院,合肥230026 [2]中国科学院广州能源研究所,中国科学院可再生能源重点实验室,广州510640 [3]华南农业大学材料与能源学院,广州510642

出　　处：《太阳能学报》2022年第7期430-438,共9页Acta Energiae Solaris Sinica

基　　金：国家重点研发计划(2019YFB1503905);国家自然科学基金(51676192);广东省科技计划(2019A050510031)。

摘　　要：以木本中药渣为原料,采用浸渍法负载不同含量K_(2)CO_(3)催化剂;通过热重实验,分析中药渣催化热解特性和热解特征参数,并采用Starink法进行动力学分析,计算催化热解反应的表观活化能;使用固定床热解炉,优化催化热解反应条件,考察不同K_(2)CO_(3)负载量对热解产物分布的影响规律。热重结果表明,K_(2)CO_(3)能显著降低中药渣的初始热解温度和最大热解温度,从而降低热解快速失重段的反应活化能;且K_(2)CO_(3)负载量越大,催化热解效果越好。热解实验证实:K_(2)CO_(3)含量为中药渣催化热解反应的最主要影响因素,它可加速生物基大分子的低温解聚和热解中间产物的催化裂解,既可降低热解油产率,又能大幅提升H_(2)、CO和C_(2)H_(6)等小分子低碳烃气体的产率,且有利于提高热解气的H_(2)/CO比例。Woody herb residues were used as the raw materials,and K_(2)CO_(3) catalysts with different contents were simply loaded by the impregnation method.The catalytic pyrolysis characteristics and kinetic parameters of herb residues were analyzed by thermogravimetric experiments(TG),and Starink method was used for kinetic analysis to calculate the apparent activation energy of catalytic pyrolysis reaction.A fixed-bed reactor was used to optimize the catalytic pyrolysis conditions,and the effect of K_(2)CO_(3) loadings on the product distribution of the herb residue pyrolysis was investigated as well.The TG/DTG results of thermogravimetric analysis show that K_(2)CO_(3) could significantly reduce the initial pyrolytic temperature(Ti)and maximum pyrolytic temperature(Tmax),and greatly reduce the activation energy of the herb catalytic pyrolysis during the rapid weight loss.The greater the K_(2)CO_(3) loading is,the higher efficient the herb catalytic pyrolysis is.The fixed-bed pyrolysis experiments show that K_(2)CO_(3) loading is the most important factor for the catalytic pyrolysis of the herb residues based on the orthogonal analysis.It is proved that K_(2)CO_(3) accelerates the low-temperature depolymerization of biological macromolecules and the catalytic cracking of pyrolysis intermediates.Potassium carbonate not only reduces the yield of pyrolysis oil,but also obviously increases the yield of syngas(H_(2),CO)and small molecule low-carbon hydrocarbon gases such as C_(2)H_(6) and C_(3)H_(8),which is conducive to increasing the H_(2)/CO molar ratio of pyrolysis gas.

关 键 词：生物质 热解 动力学参数 碳酸钾 中药渣 

分 类 号：TK6[动力工程及工程热物理—生物能]