Thermal degradation and spontaneous ignition of paper sheets in air by irradiation

摘要: The temperature and surface-density histories of a radiantly heated thermally thin filter-paper sheet held freely in air were measured order to study the dynamics ignition paper. Analyses these indicate that chemically complex degradation reactions can be approximately represented for fire purposes by two competitive first-order with Arrhenius kinetics as observed Tang [3]. One preexponential factor 5.9 × 10 6 sec −1 an activation energy 26 kcal/gm-mole is dominant at less than about 655°K. At higher temperatures, other reaction 1.9 16 cnergy 54 dominant. heat-transfer rates from test estimate energetics reactions. data insensitive small heat low-temperature reaction. Assuming this −88 cal/g (endothermic), based on DTA measurements Neill [8], high-temperature estimated 444 (exothermic). An approximate formula developed predict spontaneous under known heating cooling conditions, provided are known. Using formula, results compared well Martin's [9] data.