MSF海水淡化装置喷射器性能分析

The performance analysis of steam ejector in MSF desalination device

结合蒸汽动力函数和热力学分析方法,建立蒸汽喷射器的数学模型,分析最佳引射系数的影响因素,引射系数随混合蒸汽出口压力的关系及引射压力随工作蒸汽压力和混合蒸汽出口压力的关系。分析指出,工作条件一定时,最佳引射系数是固定值;在达到极限值前,引射系数随混合蒸汽出口压力的增大而降低,达到极限值时,引射系数不随出口蒸汽压力的变化而变化;引射压力在设计范围内随工作蒸汽压力的升高而降低,随混合蒸汽出口压力的升高而升高。

Mathematical model of steam ejector was established by combining with the gas flow dynamic functions and thermodynamic analysis method, to analyze factors affecting the entrainment ratio, the relationship between entrainment ratio with the mixed steam pressure and suction pressure with motive steam pressure or mixed steam pressure. The results of the simulation indicated that the entrainment ratio has a best value when under a certain condition. Before the limiting entrainment ratio, the mixed steam pressure is inversely proportional to the entrainment ratio. When the entrainment ratio reaches limit, there is no relationship between entrainment ratio and mixed steam pressure;in the design value, the suction pressure would improve when the motivesteam pressure is increase or mixed steam pressure is decrease.