多效蒸发海水淡化系统模拟计算与优化

以9效竖管降膜多效蒸发海水淡化系统为例,分别应用等温差分配法和等面积分配法对多效蒸发海水淡化系统进行了模拟计算,计算过程中考虑了海水沸点升高的影响。计算结果表明,在相同的淡水产量前提下,等温差分配法和等面积分配法的模拟计算结果相差不大,等温差分配得到的蒸发器总面积要比等面积分配得到的蒸发器总面积略小,等面积分配所需的加热生蒸汽量比等温差分配所需加热生蒸汽量略少。同时,以系统总传热损失最小为优化目标对多效蒸发海水淡化系统进行了优化计算,并将优化设计结果与等面积分配法的计算结果进行了比较,结果表明,优化计算结果比等面积分配计算结果节省传热面积20.3%,节省加热生蒸汽量3.3%,可以有效降低海水淡化淡水成本。

SIMULATION AND OPTIMIZATION OF MEE SEAWATER DESALINATION SYSTEM

Using equal area and temperature-difference distribution method,a desalination system of nine effects falling film evaporation of vertical tube was simulated and analyzed.The increase of boiling point in calculation was considered.The results show that under the condition of the same amount of water product,there are no great differences between equal area and equal temperature-difference distribution methods,the total area of evaporators by equal temperature-difference distribution method is smaller than that of equal-area distribution method and the amount of heating steam of the first effect by equal area method is smaller than that of equal temperature-difference distribution method.The optimization of nine effects falling film evaporation system was carried out using the minimization of the total energy loss.Compared with the results of equal area distribution method,it is shown that the total area of evaporators reduces 20.3% and the amount of heating steam of the first effect reduces 3.3%,which considerably decreases the cost of water desalination.