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基于绝热过程火积耗散极值原理,分别在对流传热和复合传热(对流和辐射传热)边界条件下,对轧钢加热炉壁变截面绝热层进行构形优化,得到火积耗散率最小的绝热层最优构形.结果表明:与等截面绝热层相比,火积耗散率最小的变截面绝热层整体绝热性能更优.热损失率最小和火积耗散率最小的绝热层最优构形是不同的.热损失率最小的绝热层最优构形使得其能量损失减小,而火积耗散率最小的绝热层最优构形使得其整体绝热性能提高.火积耗散率最小和最大温度梯度最小的变截面绝热层最优构形差别较小,此时火积耗散率最小的绝热层最优构形在提高绝热层整体绝热性能的同时也提高了其热安全性.基于火积理论的绝热层构形优化为绝热系统的优化设计提供了新的指导.
Based on the principle of exergy dissipation and dissipative extremum in adiabatic process, the configuration of the thermal insulation of the variable cross section of the heating furnace wall of the steel rolling mill was optimized under the conditions of convective heat transfer and composite heat transfer (convection and radiation heat transfer) respectively, The results show that the thermal insulation of variable section insulation with the smallest fire product dissipation rate is better than that of the other insulation with the smallest heat loss rate and the lowest fire product dissipation rate The optimal configuration of the insulation is different.The optimal configuration of the insulation with the smallest heat loss makes the energy loss decrease, while the optimal configuration of the insulation with the smallest dissipation of fluence makes the overall insulation improve. The optimal configuration of the thermal insulation layer with the smallest product of thermal dissipation coefficient and the largest temperature gradient is small, and the optimal configuration of the thermal insulation layer with the smallest thermal product dissipation rate increases the overall thermal insulation properties of the thermal insulation layer Its thermal safety.The optimization of thermal insulation layer based on fire product theory provides a new guide for the optimal design of thermal insulation system.