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建立了顺流进料的多相流蒸发法高浓缩率海水淡化系统的数学模型,考虑了热力损失、压力损失、盐水含量变化引起的温差损失;计算分析了相同淡水产量下固体颗粒体积分数、预热量、首效加热蒸汽温度对系统的影响。结果表明,固体颗粒体积分数和首效加热蒸汽温度对各效蒸发器传热面积影响较大;预热量对生蒸汽耗量影响较大;固体颗粒的加入能够强化传热,减小各效蒸发器的传热面积;在无预热情况下,固体颗粒体积分数为13%时,蒸发器总传热系数比固体颗粒体积分数为3%时可增大6.71%,各效蒸发器传热面积减少4.97%,淡水成本减少1.22%。
The mathematical model of high concentration desalination system for multiphase flow evaporation by multiphase flow evaporation was established, taking into account the thermal loss, pressure loss and temperature difference loss caused by the change of brine content. The calculation and analysis of the volume fraction of solid particles under the same freshwater production, Preheat, the first effect of heating steam temperature on the system. The results show that the volume fraction of solid particles and the temperature of the first effect heating steam have a great influence on the heat transfer area of each evaporator. The preheating has a great effect on the steam consumption. The addition of solid particles can enhance the heat transfer and reduce the effects Evaporator heat transfer area; without preheating, when the volume fraction of solid particles is 13%, the total heat transfer coefficient of evaporator can increase by 6.71% when the volume fraction of solid particles is 3% 4.97% reduction in area and 1.22% reduction in freshwater cost.