Abstract: In order to study the performance of the bull?lining component with local damage caused by fireproof coatings at high temperature, a simulation model of the bull-lining component with three sides of fire was established by ABAQUS software, and the thermal parameters of different coatings and the temperature field of the component under local damage after high temperature were analyzed. Based on the simulation results, a calculation model considering the length and height of the temperature changing section is established to providing references for the fire resistance design of the same type of component. The results show that the higher the thickness of the coating, the lower the temperature of the underside of the bull leg. The higher the thermal conductivity of the coating, the higher the temperature of the underside of the bull leg. The specific heat capacity and density of the coating have no effect on the temperature field. The larger the local shedding length of the bottom of the bull leg, the smaller the length of the temperature change section, and the greater the influence height. The greater the local peel thickness of the bottom of the bull leg, the greater the length of the temperature change section and the greater the influence height. The local damage of the paint on the joint of the bullock and lining has no effect on the length of the temperature change section and the influence height. The temperature change section is about 74 mm, and the influence height is about 43 mm.

Key words: fireproof paint, local injury, bull-lining structure, high temperature, temperature field, finite element analysis, falling off, stripping