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在文献[1]中,管式裂解炉和转化炉内管壁温度的校正用到炉管对炉墙辐射的反射辐射该文采用:对无遮挡炉管,反射辐射为,E_R=C_0(1-ε)ε_wT_w~4·10~(-8) (1)对有遮挡炉管,反射辐射为,E_R~’=FC_0(1-ε)ε_wT_w~4·10~(-8) (2)式中F 为几何因子。应当指出:式(1)和(2)都是一种近似式。确切地说,它是灰体间辐射换热的无穷往返的反射过程中仅计及一次反射的近似式。正确的表达式,按文献[2]应该是
In Ref. [1], the correction of tube wall temperature in tube cracking furnace and reformer is based on the radiation reflected by the tube on the furnace wall. This article uses: For unburned tubes, the reflected radiation is E_R = C_0 (1 - ε) ε_wT_w ~ 4 · 10 ~ (-8) (1) For the sheltered tubes, the reflected radiation is E_R ~ ’= FC_0 (1-ε) εwT_w ~ 4 · 10 ~ (-8) F is the geometric factor. It should be pointed out that equations (1) and (2) are both approximations. Rather, it is an approximation that takes into account only one reflection during the infinitely reciprocating reflections of the heat transfer between the grays. The correct expression, according to the literature [2] should be