Ejectors - Types of Ejectors:
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In a liquid Jet Ejector, the motive fluid is a non-compressible liquid (generally water) with no heat energy hence with a single stage centrifugal pump we can not increase its pressure much. As a result motive fluid velocity at the nozzle tip is very less and it affects its non-condensable load handling capacity drastically. |
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In a steam jet Ejector, the motive fluid is a jet of high pressure and low velocity compressible steam which exists from the nozzle at the designed suction pressure and super sonic velocity thus entraining the vapour in to the suction chamber. Due to the super sonic velocity of the steam at the tip of the nozzle, its non-condensable load handling capacity is much higher than liquid jet ejectors. |
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In this type of ejector system, both Liquid jet and Steam jet Ejectors are employed simultaneously to produce low absolute pressure. The suction of Liquid Jet Ejector is connected to the discharge of last stage of the steam jet ejector. |
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On basis of number of nozzles :
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