During the thermal acceptance of a 2 × 125 MW unit of a power plant

a pipe with the same diameter was found.Under the same thickness of the main insulation layer

the surface temperature of the aluminum plate used in the protective layer was higher than that of the coating layer. The surface temperature of the layer is 5 to 7 ℃. How to reduce the temperature of the outer surface of the protective layer has become the standard to verify the good or bad insulation effect. In view of this phenomenon

the relationship between the surface temperature of the aluminum plate and the coating layer and the loss of heat dissipation is analyzed

and it is found that the thermal radiation blackness of the two materials is different.The surface heat transfer coefficient is quite different. High surface temperature aluminum protective layer heat loss is small

low surface temperature coating heat loss is large. The surface heat transfer coefficient of metal shell and matte material in thermal power plant is studied in accordance with the design rules of thermal insulation paint

and the field measurements are compared to confirm that the surface temperature of thermal insulation body is closely related to the heat dissipation loss and heat dissipation coefficient of the protective layer. Therefore

the same thermal insulation thickness

to reduce the surface temperature

then

only need to change the material of the protective layer can be achieved.