Analysis of thermal radiation ability of refractory brick

At the same temperature, the ratio of heat energy and blackbody radiation surface of refractory brick of the radiation. Also cal. Also called the blackness, rate of thermal radiation, the radiation rate, radiation coefficient, and relative radiation rate. It is characterized of refractory brick surface of the heat radiation ability. High temperature kiln furnace wall brick surface emissivity directly affects the efficiency of heat transfer in the furnace material. Use from the emissivity of paint spraying furnace wall heating furnace to improve the thermal efficiency is one of the important ways, saving fuel consumption, the influence of the surface emissivity of refractory brick composition and surface state. Silicon carbide, zirconium containing refractory brick has a relatively high emission rates, often used in the manufacturing of high emissivity coating. Refractory brick firing rate decreased with the increase of temperature in general. The surface state it largely depends on the refractory materials. The surface roughness increases when the emissivity. Refractory brick at room temperature, surface emissivity typically between (0.85 ~ 0.99)

Brick under normal temperature and surface emissivity are typically between (0.85 ~ 0.99)

Refractory brick emission test method a lot of, common card meter method, it is the vacuum cavity to be measured refractory brick sample in the constant temperature and the inner wall around the black. For refractory brick samples after heating specimen measured under steady state conditions the thermal equilibrium temperature and input power, or cooling curve for determination of refractory brick samples (non steady state method), Hen according to the law of conservation of energy to write the heat balance equation, to calculate the emission rate of refractory brick.

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