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一、辐射管炉内的热交换在辐射管供热的工业炉内,参与辐射热交换的物体是辐射管、炉衬和被加热的工件。因为工件通常在中性气氛(N_2可达90%)、还原性气氛(H_2可达75%)或渗碳气氛(CO可达12%)等可控气氛内加热,有时就在一般的空气内加热,这类气氛内三原子气体的含量一般都不高,因而炉内气氛对辐射换热并没有重大影响(和电阻炉内的辐射传热颇为相似),计算时可不必考虑气体辐射。由辐射管传给工件的热量按下式计算: Q_(fg)=Ψ_(fg)C_d[((T_f)/(100))~4
First, the radiation tube furnace heat exchange In the radiant tube heating industrial furnace, involved in the radiation heat exchange objects are radiant tubes, lining and heated workpiece. Because the workpiece is usually heated in a controlled atmosphere such as a neutral atmosphere (N 2 up to 90%), a reducing atmosphere (H 2 up to 75%) or a carburizing atmosphere (CO up to 12%), Heating, the atmosphere of the three atomic gas content is generally not high, so the furnace atmosphere on the radiation heat transfer and has no significant impact (and resistance furnace radiation heat transfer is quite similar), the calculation may not have to consider the gas radiation. The heat transferred from the radiant tube to the workpiece is calculated as follows: Q_ (fg) = Ψ_ (fg) C_d [((T_f) / (100)) ~ 4