Fire Safety Science Digital Archive

The formulation of the polyacrylonitrile pyrolysis problem. The designing of its process and the problem solution are discussed. The pyrolysis is considered as a double step process when the formation of a liquid phase is excluded, that is the initial substance and the coke obtained are powders. Three main reactions are considered: a) with the evolution of ammonia: b) with the evolution of hydrogen cyanide; c) with the evolution of hydrogen. The latter two reactions are sequential, and the reactions a) and b) are parallel. The problem is formulated as one dimensional The equations of energy, masses or concentrations, porosity and thermal conductivity are proposed . The mathematical model of the carbonization process is designed using the above reactions (a , b and c ). The equations received are calculated by the Runge - Cutta method . The results of calculations were confirmed by the tendency of experimental data changes .