It provides high vacuum level with small flowrate. Steam jet vacuum ejectors can be used to remove the gases and vapor generated during the process and generate vacuum in the reactor (refer the image which has mounted ejector on the vessel).Vacuum jet ejectors used motive fluid as compressed air. In the case of vacuum jet ejectors, due to their static and compact structure, there will be less wear and tear.In this way, waste gas (flare gas) can be recovered and added to the production.įigure 5 : Steam Jet Ejector mounted on Vessel As motive fluid flows through a nozzle, it expands at high pressure and reduces the velocity of the fluid. It is accomplished through adiabatic expansion from the supply pressure of the motive fluid to the suction pressure load created in the suction chamber. In general, ejectors convert the pressure energy (potential energy) of the motive fluid to velocity energy (kinetic energy).Once the motive fluid passed through the nozzle, due to a change in cross sectional flow area (cone shape after nozzle), the compressed fluid slows down and the recovered gas obtained in suction chamber will be discharged with the help of a diffuser (yellow arrow fig 4). During the process, motive fluid is compressed and accelerated. Afterward, it is passed through the nozzle. Motive fluid is provided through the inlet (yellow arrow in fig.4) of the ejector and the low pressure flare gas from the process vessel or reactor (yellow arrow fig.Motive fluid can be anything that further can be compressed by ejector.
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