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实际烧结生产是一个复杂的物理化学过程,其中主要包括碳的燃烧,矿石的分解、还原和再氧化,液相的形成与冷凝。本文以国内某钢铁厂烧结机为研究对象,以流体计算软件Fluent6.3为平台,利用内热源放热简化燃烧模型,采用用户自定义函数的UDS构建多孔介质局部非热力学平衡的能量双方程模型,模拟烧结过程中固体与气体间的换热过程,得到了烧结矿和烧结烟气的温度分布。结果表明:随着烧结过程的进行,料层中的高温区会下移,由于烧结过程的蓄热作用,烧结矿的最高温度逐渐升高,达到一个最高点后开始下降,表明烧结过程结束,因此最高温度点即为烧结终点。利用数值模拟结果确定烧结终点后,根据模糊控制理论对台车速度实行在线控制,以提高烧结矿产量和质量,充分发挥烧结机的利用效率。
The actual sintering production is a complex physical and chemical process, which mainly includes the combustion of carbon, ore decomposition, reduction and reoxidation, liquid phase formation and condensation. In this paper, a steel sinter in a domestic steel mill is taken as the research object. With the fluid calculation software Fluent6.3 as a platform, the internal heat source exothermic simplified combustion model is used, and the user-defined function UDS is used to construct the energy two-equation model of local non-thermodynamic equilibrium in porous media , The heat transfer process between solid and gas was simulated and the temperature distribution of sinter and sintering flue gas was obtained. The results show that as the sintering process proceeds, the high temperature zone in the material layer will move downward. Due to the heat accumulation during the sintering process, the maximum temperature of the sinter ore gradually increases, reaches a peak and then begins to decline, indicating that the sintering process is completed, Therefore, the highest temperature point is the sintering end point. After the final sintering point is determined by numerical simulation, the trolley speed is controlled online according to fuzzy control theory to improve the yield and quality of sinter and make full use of the utilization efficiency of sintering machine.