TG-FTIR研究垃圾衍生燃料轻质气体析出特性

摘要

通过热重红外分析仪(TG-FTIR)研究垃圾衍生燃料(refuse derived fuel,RDF)在升温速率为10℃/min、20℃/min、30℃/min、40℃/min、50℃/min及RDF与褐煤在质量比为0:10、3:7、5:5、7:3、10:0时轻质气体的析出特性,利用Coats-Redfern法,求得热解动力学参数.研究发现,不同升温速率及不同质量配比时RDF热解过程主要分为3个阶段:生物质组分热解(173~433℃)、塑料类物质热解(402~566℃)及无机碳酸盐热解(大于650℃).热解过程轻质气体CO2、CH4、CO析出均表现为双峰特性;CO2的释放集中在低温段(200~300℃)和高温段(600~800℃),CO的释放集中在低温段(300~400℃)和高温段(600~800℃),CH4的释放集中在中温段(300~600℃).随着升温速率的增加,轻质气体CO2、CH4及CO析出峰值浓度增加.RDF与褐煤共热解过程存在协同作用.%The pyrolysis gas characteristics of refuse derived fuel(RDF)at the heating rates of 10℃/min, 20℃/min,30℃/min,40℃/min,50℃/min and at the mass ratios of 0:10,3:7,5:5,7:3,10:0 with lignite are,respectively,studied by the infrared thermogravimetric analysis.The apparent kinetic parameters are obtained by using the Coats-Redfern method in the pyrolysis stage.The study finds that the pyrolysis process of RDF at different heating rates and different mass ratios can be divided into three stages:biomass components py-rolysis(173—433℃),plastic materials pyrolysis(402—566℃)and inorganic carbonate pyrolysis(>650℃).In the process of pyrolysis,light gases(CO2,CH4 and CO)reflect a bimodal characteristic.However,CO2 is re-leased in the periods of low temperature(200—300℃)and high temperature(600—800℃).CO is released in the periods of low temperature(300—400℃)and high temperature(600—800℃),while CH4is released in the pe-riod of middle temperature(300—600℃).With the heating rate speeding up,the peak concentrations of the light gases CO2,CH4 and CO increase.There is a synergistic effect between the co-pyrolysis of RDF and lignite.