摘要
为了解典型木纤维粉尘的热解及爆炸特性,以红木纤维粉尘和杨木纤维粉尘为研究对象,利用热重-红外联用仪,对两种粉尘的热分解过程、动力学参数及热解气体种类进行计算分析。结果表明:红木纤维粉尘的热解速率高于杨木纤维粉尘,而活化能较低;两种粉尘的热失重主要体现在低温时的热分解和高温时的燃烧反应,热解产物主要为CO_(2)、CO、H2O和少量的烷烃、醇类、醛类、酮类、羧酸类物质,燃烧产物主要为CO_(2)和CO,且红木纤维燃烧产物CO_(2)的量高于杨木纤维,而杨木纤维的热解燃烧过程相对复杂,不完全燃烧程度高。对两种木纤维粉尘的粉尘云最低着火温度和最大爆炸压力进行了测试,发现红木纤维粉尘较杨木更危险,并通过热重-红外探究其机理。研究结果可为涉及此类粉尘场所制定相关政策和措施时提供参考。
In order to understand the pyrolysis and explosion characteristics of typical wood fiber dusts,the pyrolysis process,kinetic parameters,and pyrolysis gas types of the two dusts were calculated and analyzed using thermogravimetric-infrared coupler with redwood fiber dust and poplar fiber dust as the research objects.The results showed that the pyrolysis rate of mahogany dust was higher than that of poplar dust,and the activation energy was lower.The thermal weight loss of the two dusts was mainly reflected in the thermal decomposition at low temperature and combustion reaction at high temperature,and the pyrolysis products were mainly CO_(2),CO,H2O and a small amount of alkanes,alcohols,aldehydes,ketones and carboxylic acids,and the combustion products were mainly CO_(2) and CO,and the amount of CO_(2) of combustion products of mahogany fiber was higher than that of poplar fiber,while the pyrolytic combustion process of poplar fiber is relatively complex,with a high degree of incomplete combustion.The dust cloud minimum ignition temperature and maximum explosion pressure of the two wood fiber dusts were tested.Redwood fiber dust was more dangerous than poplar,and the mechanism was explained from the thermogravimetric-infrared test results.The results of this study could provide some data reference for the development of relevant policies and measures at sites involving such dusts.
作者
张博涛
张智健
王霁
侯耀华
ZHANG Bo-tao;ZHANG Zhi-jian;WANG Ji;HOU Yao-hua(Chinese People's Police University,Langfang 065000,Hebei,P.R.China)
出处
《林产工业》
北大核心
2024年第1期20-25,共6页
China Forest Products Industry
基金
河北省自然科学基金项目(E2021507005)。
关键词
木纤维粉尘
热重-红外联用
爆炸特性参数
热分解特性
粉尘爆炸预防
Wood fiber dust
TG-IR
Explosive characteristic parameters
Thermal decomposition characteristics
Dust explosion prevention
