推钢式板坯加热炉流场、温度场和浓度场的模拟研究

Modeling of Flow,Temperature and Concentration Fields in the Pusher-Type Slab Reheating Furnace

针对推钢式板坯加热炉,建立加热炉内气体流动、燃烧和传热过程数学模型.采用计算流体力学(CFD)商业软件Fluent模拟得到加热炉炉内的温度场、流场以及反应物和生成物浓度分布.结果表明:通过预热空气至350℃和预热煤气至50℃,平均炉温能够达到1 300℃,满足钢坯加热温度要求.由于加热炉结构复杂,使得炉内有明显的回流,预热助燃空气可以有效提高炉温,燃烧充分时炉子热效率也高.模拟结果对加热炉优化设计及操作都具有重要的参考价值.

A mathematical model of gas flow,combustion and heat transfer in the pusher-type slab reheating furnace was developed with the commercial CFD software Fluent to compute the flow and temperature fields and the concentration distribution of the reactants/products from combustion.Numerical results showed that the average temperature of furnace will come up to 1A4!300A4!℃ when the temperatures of preheated air and coal gas are 350A4!℃ and 50A4!℃,respectively.Thus,it is available to meet the requirement for slab＇s reheated temperature.The recirculation flow due to the complex geometry of furnace,is found obviously,and the combustion air preheating can raise the gas temperature in furnace efficiently so as to improve the furnace＇s thermal efficiency especially during full combustion.Such results may be taken as important reference for the optimal design and operation of reheating furnaces.