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为了探索环冷机关键结构参数和操作参数对球团冷却效果及过程节能降耗的优化途径,运用双能量方程建立了某球团厂的环冷机球团料层内部气、固相非平衡传热模型,应用“未反应核模型”建立了料层内部的主要化学反应(磁铁矿氧化)的反应速率计算模型,基于Matlab平台实现了对不同操作条件下球团冷却过程的数值仿真。对多个设计工况的仿真结果表明:以球团产量、冷却效果不变为约束,当料层厚度达原厚度的2倍时,环冷机3段排气温度分别提高50、71、33℃,并可节约用风23.6%,即适当增加料层厚度有利于能量回收和节约用风。
In order to explore the key structural parameters and operating parameters of the circular cooler on the cooling effect of the pellet and the process of energy saving optimization approach, the use of dual energy equation established a pelletizing plant within the ring cooler pellet bed internal gas and solid phase imbalance Heat transfer model, the calculation model of the reaction rate of the main chemical reaction (magnetite oxidation) in the material layer was established by using the “unreacted core model”. Based on the Matlab platform, the numerical values of the cooling process under different operating conditions simulation. The simulation results of several design conditions show that with the output of the pellets and the cooling effect unchanged, when the material thickness reaches twice of the original thickness, the temperature of the exhaust gas of the three-stage cooler increases by 50, 71 and 33 ℃, and can save 23.6% of the wind, which is appropriate to increase the thickness of the material is conducive to energy recovery and wind conservation.