MATHEMATICAL DESIGN OF FIRE-RESISTANCE OF BEARING METAL CONSTRUCTIONS OF MACHINE HALLS OF POWER-STATIONS

Abstract

Reasons of fire origins and their progress in the machine halls of electric power stations are analyzed. The burning process of hydrogen and hydrogen-oil mixtures in machine halls in conditions of fire is considered. The most possible places of origin of fire risk concentrations of mixtures of hydrogen-oil-air are analyzed. The research method of thermal processes which appear during fires is developed. Temperature flows caused by irradiation of fire are determined. Temperature field is investigated according to thickness of metal construction depending on thermal flow rate, thickness of construction, fire resistance coating and their thermal physical features. It is shown that bulged fire proof surface can increase the fire-resistance of bearing constructions of machine halls.