基于?的管式降膜蒸发器液位优化设定

Liquid level optimal-setting for tube falling film evaporator based on exergy

在降膜蒸发器中,物料液位直接影响蒸发器分离室压力和出料温度从而影响加热蒸汽消耗,对蒸发器的优化操作十分重要。但实际生产中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?分析的管式降膜蒸发器液位优化设定方法。深入分析了液位高度对蒸发过程各参数的影响,基于实际生产数据,拟合得到了液位与其他参数间的关系模型。结合蒸发器物料平衡关系以及?分析方法,建立了最大化?效率的能耗优化模型。对优化模型求解得到了蒸发器?效率随液位高度变化的关系曲线,最后计算了不同工况条件下的最优液位,为优化实际生产操作提供了参考。

In the tube falling film evaporator, liquid level directly influences the pressure and the temperature in the evaporator and therefore influences the heating steam consumption. So, it is an important parameter for optimization of evaporator operation. But in the actual production, the liquid level is usually set empirically in a large range, so that the process cannot run in optimal situation. A liquid level optimal-setting method based on exergy analysis is proposed. By deeply analyzing the liquid level＇s effect on other evaporation parameters and using the actual running data of the sodium aluminate solution evaporation process for alumina production, the correlations between liquid level and other parameters are obtained. An optimization model based on the maximum exergy efficiency is then established based on the material balance of the evaporator and the exergy analysis method. The optimization model is then solved under a certain condition to get the exergy efficiency- liquid level curve. Finally the optimal level under different operating conditions is calculated, which provides guidance for the optimization of the actual production operation.