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在拜耳法生产氧化铝多效蒸发过程中,各蒸发器液位是影响流程各个参数的重要变量,对整个蒸发过程的优化操作十分重要。但实际生产中各效蒸发器液位的设定值通常是一个较大的范围,难以优化运用。针对此问题提出了一种基于?分析的多效蒸发流程液位优化设定方法。在对液位作用机理分析的基础上,基于整个流程的实际生产数据,拟合得到了每效包含液位随其他参数变化的关系模型。结合蒸发流程物料平衡关系以及?分析方法,建立了综合?效率评价指标的能耗优化模型。最后,采用两种不同约束处理技术和状态转移算法,计算了不同酸洗周期下的各效蒸发器最优液位,得到了优化目标随各个效液位高度变化的关系曲线。
During the multi-effect evaporation of alumina produced by Bayer process, each evaporator level is an important variable that affects all parameters of the process and is very important for the optimization of the entire evaporation process. However, the actual production of the evaporator evaporator level set value is usually a large range, it is difficult to optimize the use. Aiming at this problem, a method based on the analysis of the multi-effect evaporation process level optimization setting method is proposed. Based on the analysis of mechanism of liquid level, based on the actual production data of the whole process, the relation model of each effective liquid level changing with other parameters was fitted. Combined with the material balance of the evaporation process and the analytical method, an energy consumption optimization model of comprehensive evaluation index was established. Finally, two different constraint processing techniques and state transition algorithms were used to calculate the optimum liquid level of each evaporator under different pickling cycles. The relation curves of the optimization target with the height of each effective liquid level were obtained.