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Exhaust steam pressure - PowerPoint PPT Presentation

Air Ejector

Air Ejector works on the principle of convergent /divergent nozzle as it provides the venturi effect at the point of diffusion as the tube gets narrows at the throat the velocity of the fluid increases and because of the venturi affect it pressure decreases, vacuum will occur in the diffuser throat where the suction line will be provided. An air ejector which uses the high pressure motive fluid such as air or steam to flow through the convergent nozzle the function of the convergent nozzle is to convert the pressure energy of the motive fluid into the velocity energy.

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Air Ejector

Air ejector is an essential component of any type of feed system on the ship. As the name suggests, the equipment completely removes the air from any system and also draws out the vapours released from the condensing steam in the condenser. Presence of air in the system leads to several detrimental effects on the boiler. Corrosion is one such effect that in long run results is failure of the boiler from the inside. Also, the accumulation of air inside the condenser affects the condensing process, which results in the production of back pressure. The back pressure thus generated leads to increase in exhaust steam pressure and reduction in thermal efficiency of the plant. Let's take a look at the construction and working of conventional air ejectors.

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Exhaust steam pressure - PowerPoint PPT Presentation

Air Ejector

Air Ejector