Procedure for constructing a mathematical model to determine the time of the initial stage of fire evolution

To develop appropriate measures and means of fire protection at facilities, it is relevant to form an idea the phenomenology processes occurrence, evolution, termination combustion. This paper proposes procedures for building mathematical models energy component those physicochemical that occur in wood under influence fire, which make possible determine time from beginning such impact onset phase flame The adequacy modeling was tested experimentally a standardized installation studying propagation over surface wood. samples used reported theoretical experimental studies were specimens unprotected made 20-mm-thick pine sapwood with density 400‒550 kg/m3. fireproof (of same variety, thickness, density) impregnated retardant based on diammonium phosphate ammonium sulfate (at consumption 168.2 g/m2 dry fire-retardant components). employed results determining ignition temperature fire-proof wood, specifically: 235 °C – 410 respectively. confirm possibility significant lengthening exposure load when nitrogen-phosphorus impregnating agents are protection. Procedures have been proposed build cooling effect use retardants protect prolongation stage start. Mathematical data could be applied making