水洗及K2CO3对油棕废弃物热解特性的影响.docVIP

 水洗及 K2CO3 对油棕废弃物热解特性的 影响# 杜胜磊，杨海平，陈汉平，王贤华，张世红** 5 10 （华中科技大学煤燃烧国家重点实验室，武汉 430074） 摘要：本文研究了水洗及 K2CO3 添加对油棕废弃物热解行为的影响，采用热重分析仪与傅立 叶红外光谱仪联用对预处理的油棕废弃物的热解机理与气体产物的形成与释放特性进行了 在线分析，并采用 Coats-Redfern 方法对其动力学参数进行了分析研究。研究表明，水洗及 K2CO3 添加对油棕废弃物的热解特性及气体产物释放有着显著的影响。水洗使生物质的热解 温度升高，而 K2CO3 的添加却使得生物质的热解温度降低，热解活化能明显减小，且热解失 重峰也从两个独立峰而重叠耦合为单峰。K2CO3 的添加明显促进了小分子气体 CO、CO2 等的低 温析出，同时也使它们的总产量有明显的提高，而有机碳氢化合物和 CH4 的量则大幅度降低。 关键词：生物能；水洗；K2CO3；热解；催化 中图分类号：TK6 15 Influences of washing and K2CO3 on pyrolysis behavior of palm oil wastes DU Shenglei, YANG Haiping, CHEN Hanping, WANG Xianhua, ZHANG Shihong (State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 20 25 30 35 40 WuHan 430074) Abstract: The impact of washing and K2CO3 on pyrolysis behavior of palm oil wastes was studied in this paper. Thermogravimetric analyzer and Fourier transform infrared spectroscopy (TGA- FTIR) was applied to explore the pyrolysis mechanism of pretreated palm oil wastes samples and the subsequent releasing gas products. Kinetic parameters of the samples were calculated using Coats-Redfern method. The results showed the pretreatment had significant influences on the samples’ pyrolysis characteristic and the components of gas products: washing lead to the increasing of initial pyrolysis temperature; K2CO3 addition lead to the decreasing of the initial pyrolysis temperature and pyrolysis activation energy; weight loss rate shifted from a bimodal structure to a single peak. The addition of K2CO3 promoted the volatilization of the small molecule gas such as CO and CO2 under low temperature and enhanced their total yield obviously while reduced the amount of hydrocarbon and CH4 by a large margin. Keywords: biomass; water leached; K2CO3; pyrolysis; catalysis 0 引言 生物质的化学构成主要有半纤维素、纤维素和木质素与少量无机矿物质组成[1-3]，无机 矿物质灰中 Si、Ca、K、Na、Mg 等以氧化物、硅酸盐、碳酸盐、硫酸盐等形式存在[4]。前 人研究[5-17]表明一些矿物质（如：Ca，K，Na，Mg，Fe 等）对生物质的热解具有明显的催 化作用，即使是很小的份量也足以使生物质的热解特性发生很大的改变[18]。已有多种无机 盐（如：CaCO3、MgCO3、K2CO3、Na2CO3、KCl、ZnCl2、Fe