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采用热重分析法在不同升温速度(10～90K/min)和不同粒径(40～60目,100目)对两种家具加工剩余物(椴木和松木)进行热解实验研究,并通过质谱仪在线检测热解产生的部分气体产物。实验结果表明:木质材料的热解过程分为失水干燥、缓慢热解、快速热解及炭化4个阶段。进行热解动力学分析,得到相关的表观活化能及指前因子。快速热解阶段可由1.5级反应过程描述,根据1.5级反应由Coats-Redfern法计算椴木和松木的平均活化能E分别为77.3kJ/mol和67.8kJ/mol。利用质谱仪在线监测了CH4、H2O、CO2、H2等气体产物,其质谱曲线与对应的热重曲线相符合,也验证了各反应阶段的假设。
Thermogravimetry was used to study the pyrolysis of two kinds of furniture processing residues (basswood and pine) at different heating rates (10 ~ 90K / min) and different particle sizes (40 ~ 60 mesh and 100 mesh) The mass spectrometer detects some of the gas products produced by pyrolysis on-line. The experimental results show that the pyrolysis process of wood materials is divided into four stages: dehydration and drying, slow pyrolysis, rapid pyrolysis and carbonization. The pyrolysis kinetic analysis was carried out to obtain the related apparent activation energy and pre-exponential factor. The rapid pyrolysis stage can be described by a 1.5-step reaction process. According to the 1.5-step reaction, the average activation energies E of basswood and pine are 77.3 kJ / mol and 67.8 kJ / mol, respectively, according to the Coats-Redfern method. The gas products of CH4, H2O, CO2, H2 and other gases were monitored online by mass spectrometry, and their mass spectra curves were in good agreement with the corresponding TG curves. The assumptions of each reaction stage were also validated.