纤维素与褐煤共热解协同规律  

Study on the co⁃pyrolysis characteristics of lignite and biomass and the evolution law of related gaseous products

作　　者：高丽慧[1] 胡明 柴娜 李玲妮 李树磊[2] GAO Lihui;HU Ming;CHAI Na;LI Lingni;LI Shulei(School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China;National Engineering Re-search Center of Coal Preparation and Purification,China University of Mining and Technology,Xuzhou 221116,China;School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116 [2]中国矿业大学国家煤加工与洁净化工程技术研究中心,江苏徐州221116 [3]中国矿业大学化工学院,江苏徐州221116

出　　处：《煤炭学报》2023年第S02期740-747,共8页Journal of China Coal Society

基　　金：江苏省自然科学基金青年基金资助项目(BK20210498);中国博士后基金资助项目(2021M693420,2022T150700)。

摘　　要：生物质是一种清洁的可再生有机燃料,生物质能的开发和利用可有效解决环境污染和能源问题。目前生物质与低阶煤的共热解研究受到国内外学者的广泛关注,为解析生物质组分与褐煤共热解过程的协同作用规律,以生物质主要组成纤维素和蒙东褐煤为研究对象,以热重红外联用仪(TG-FTIR)为实验手段,进行纤维素和褐煤的单独热解和不同掺混比例下混合样品的热解动力学特性(加热速率为10、25和50℃/min)及气体析出规律研究。结果表明:纤维素组分可提高纤维素-褐煤混合物的热解活性,使混合物共热解过程中热解失重峰速率高于理论热解失重峰速率;同时,分布活化能模型(DAEM)可较好的应用于纤维素-褐煤混合物活化能的计算,且纤维素的加入可降低共热解过程中纤维素-褐煤混合物的反应能垒,使混合物在不同质量转化率下的表观活化能低于理论活化能。此外,共热解过程中小分子气体(CH_(4)、CO_(2)和CO)的析出峰值温度(400~420℃)与纤维素的气体析出温度相一致,且气体析出量高于理论值。随着混合物中纤维素比例的增加,气体实际析出量与理论计算量之间的差值呈现出先增加后降低的变化趋势,且当纤维素与褐煤的掺混比例为6∶4时,混合物C/L(6∶4)的气体释放量最高。因此,生物质与褐煤的共热解过程中,纤维素组分对混合物的共热解过程具有正协同作用。Biomass is a kind of clean and renewable organic fuel.The development and utilization of biomass can effec⁃tively solve the problems of environmental pollution and energy.At present,the research on co⁃pyrolysis of biomass and low⁃rank coal has attracted extensive attention from scholars.In order to analyze the synergetic effect of the co⁃py⁃rolysis of biomass components and lignite,this paper took cellulose and the Mengdong lignite as the research object,and used the thermogravimetric infrared spectrometer(TG⁃FTIR)as the experimental method to study the pyrolysis kinetics characteristics(heating rates of 10,25 and 50℃/min)of cellulose and lignite separately and the blends at different mixing ratios.The results show that the addition of cellulose can increase the pyrolysis activity of the mix⁃ture,and make the weight loss rate significantly increase.At the same time,distributed activation energy model(DAEM)can be applied to the calculation of activation energy of cellulose⁃lignite mixture.The experimental activation energy of the cellulose⁃lignite mixture under different mass conversion rates is lower than the theoretical acti⁃vation energy,indicating that the addition of cellulose can reduce the reaction energy barrier during the co⁃pyrolysis process.In addition,the peak temperature(400-420℃)of small molecule gases(CH_(4),CO_(2),and CO)during the co⁃pyrolysis process is consistent with the gas evolution temperature of cellulose,and the amount of gas evo⁃lution is significantly higher than the theoretical value.With the increase of the proportion of cellulose in the mixture,the difference between the actual amount of gas precipitated and the theoretical amount shows a trend of first increasing and then decreasing,and when the mixing ratio of cellulose and lignite is 6∶4,the gas release of mixture C/L(6∶4)is the highest.Therefore,the cellulose component of biomass has a positive synergistic effect on the copy⁃rolysis process.

关 键 词：纤维素 褐煤 共热解 协同效应 

分 类 号：TD984[矿业工程—选矿]