摘要
轧钢加热炉作为轧钢工序的重要加热设备,不仅影响轧钢生产的生产成本,也影响轧钢生产的产品质量。加热工艺的优化与否,关键取决于加热炉的燃料种类和燃烧系统、加热炉炉型、炉膛内炉气运动规律及炉膛热交换规律、加热工艺及炉温制度、加热炉系统热量分配及热平衡情况。
本文以某钢铁公司步进式加热炉为原型,以该加热炉的燃烧系统、炉膛内的炉气运动和热交换为主要研究内容,采用κ-ε湍流双方程模型、PDF燃烧模型和P—1辐射传热模型,建立了该步进式加热炉内燃料燃烧、炉气流动和钢坯加热的数学模型,对加热炉内钢坯的加热过程进行了数值模拟,得到了炉内炉气温度、速度的详细分布,通过模拟计算得到了钢坯的表面温度、断面温差及总在炉时间。
通过对该加热炉热过程中的炉气温度和钢坯出炉温度的跟踪实测,实测结果与数学模型数值模拟结果基本相符,验证了数学模型是可靠的,数值模拟结果是基本可信的,为该步进式加热炉的优化设计和优化操作提供了重要的理论依据。
The furnace of steel rolling is important equipment of working procedure of steel rolling. It not only influences out put cost but also quality. Technology lies on type of fuel and system of combustion, type of furnace and it's curve, rule of gas flow and heat exchange in hearth, heat up techniques and temperature system, assign heat and heat balance in furnace.
The paper researches the fuel combustion system, the gas flow and heat transfer in the reheating furnace. It established the mathematical model of gas flow, fuel combustion and heating billet of the furnace, using k-εturbulence model, PDF combustion model, P-1 radiation model, got a detailed conclusion on temperature and velocity distribution of the furnace gas, then applied the result to simulate heating process of the billet and get the temperature of the billet, the difference in temperature in break surface and the time of out-put the billet.
In order to check the reliability and the factuality of the numerical results of mathematical model, the paper has made measure to the gas temperature of the heating furnace. The numerical results of the mathematical model were compared with the measure of gas temperature, which verified the factuality and reliability of the mathematical model. The result sets important theory support to optimize the designing and operating.
引文
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