Abstract
In this study, ejector mathematical models have been presented based on thermodynamic relations governing it and in order to have an ejector computer simulation. The model which is developed based on integration equations momentum as well as energy for different parts of ejector, using special mathematical methods to solve and finally the results with real data for ejector system is assessed in vacuum distillation unit of Tehran refinery, proving that method has high accuracy. Also in continuation, in order to have a more comprehensive system review and to produce vacuum and do technical, economic comparison of the systems consisting of various vacuums: vacuum pumps, vacuum and ejector, their different arrangements were considered to combine an appropriate optimum of ejector and vacuum pump to reach a certain level of vacuum. Comprehensive study indicates that placement of a vacuum pump with ejector of third stage is more possible than the first and second stages of development. Since at least 5000 pounds per hour is reduced in the amount of steam consumed of ejectors (total of all three stages), the maximum ratio of return on investment (ROI) and the minimum initial investment will be needed.
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