火场可燃物热解燃烧过程是火灾的初始阶段,直接控制着火过程。本文采用热重分析仪,通过中途变换气氛对胶合板在火场中的热解燃烧行为进行了热重分析和差热分析研究。结果表明,在胶合板的第1热解阶段结束前变化气氛对热解过程影响不大。在第2热解阶段将空气变为氮气后,胶合板热解失重趋势立即沿氮气气氛下趋势进行;将氮气变为空气后,热解迅速加快,最终失重率与空气气氛下相同。

Pyrolysis and combustion process of combustible materials is the initial stage of fire, which has greatly influence on the development of fire. Through changing atmosphere in the halfway, the pyrolysis and combustion properties of plywood were studied by using a thermogravimetric analyzer in nitrogen under constant temperature conditions. The result indicates that effect of transforming atmosphere on the pyrolysis is little before the end of the first stage of plywood pyrolysis. In the second phase of plywood pyrolysis, atmosphere changing from air to nitrogen, the trend of weight loss is along with the trend of nitrogen atmosphere. After changing from nitrogen atmosphere to air atmosphere, pyrolysis rapidly accelerates, and final rate of weight loss is the same as that in air atmosphere.