Определение удельной массовой скорости выгорания многокомпонентных нефтепродуктов

Abstract

The specific mass burn-up rate of combustible substances (materials) in case of a fire, determines the heat release intensity, the temperature of burning, the intensity of fire development and other parameters. Like the rate of flame propagation, the mass burn-up rate depends on the physical and chemical properties of substances, their aggregate state, as well as other factors. The mass burn-up rate is used in modeling the process of fire development, assessment of the rate of heat release and the intensity of the supply of extinguishing agents to fire extinguishing installations. Currently, the values of the specific mass burn-up rate are given in various reference materials for a limited number of petroleum products. For single-component substances, the desired value can also be determined by calculation. The existing calculation formulas in theory are applicable for both simple and complex substances, and, in this case, there is a need to calculate the values of the specific heat of combustion and evaporation, the specific heat capacity of the substance. However, the process of complex hydrocarbon fuels burn-up differs significantly- it is due to the gradual burning out of individual fractions in their composition. Therefore, for complex substances the calculation should be made considering the changes in density and temperature during the process of burning. The methods for determining the specific mass rate of burnout of multicomponent petroleum products are considered, the universal nomogram and calculation formula are proposed that will allow determining the specific mass rate of burn-up, knowing the density of the petroleum product under normal conditions and its boiling point.