Air Ejectors Manufacturers and Suppliers The main function of the air ejector is to extract air and no condensate gases from a closed system. It provides vacuum by removing air from the condenser. The amount of air extracted at the time of starting is more as compared to running unit. Parts of ejector: It generally consists of converging nozzle, diverging nozzle, diffuser throat, inlet and outlet pipes, for measurement of air flow rota meter, cells with tube for regeneration heat transfer, Steam traps for drip control. An air ejector or steam ejector is a device which uses the motion of moving fluid (Motive Fluid) to transport another fluid (Suction fluid). It is has a wide range of application in steam ejector in boiler condenser, fresh water generator and in priming the centrifugal pump.
Appliction of Air Ejectors: 1. Steam Jet Air Ejector: It is one of the types of air ejector which is used in the steam like near the condenser to remove the non condensable gases and some vapour entering into main condenser by an air ejector and it is cooled by the main condensate and released in the ejector condenser. A steam is used as the motive fluid to withdraw air and dissolved gases from the condenser by the ejector action. In each stage of the steam jet ejector, high pressure steam is expanded in a convergent /divergent nozzle. The steam leaves the nozzle at a very high velocity in the order of 1220 m/s and a proportion of the kinetic energy in the steam jet transferred by interchange of momentum to the body of air which entrained and passes along with the operating steam through a diffuser in which the kinetic energy of combined steam is re-converted to pressure energy. The maximum pressure ratio that can be obtained with a single stage is roughly 5:1 and consequently it is necessary to use two or even three stages in series to establish a vacuum in the order of 724mm of Hg with reasonable steam consumption.