FUNCTION OF STEAM JET EJECTOR IN STEAM TURBINE

In this article we discussed about the function of steam jet ejector in steam turbine operation  and also know about its working principle . the Steam jet ejector are used for air removal on surface condensers. They are simple in operation and rugged in construction, can use a wide range of steam pressures, and will handle wet or dry mixtures of air, gases, or vapors at a near-perfect vacuum. However, several ejectors may be required to obtain the desired vacuum.

The steam-air ejector consists of a steam nozzle, a suction chamber, and a diffuser. Steam enters the nozzle and discharges a jet of high-velocity steam across a suction chamber into a venture-shaped diffuser. Air or gases to be evacuated enter the ejector suction, become entrained by the moving jet of steam, and are then discharged through the diffuser, where the velocity energy is converted into pressure, thereby compressing the mixture to a lower vacuum. The steam pressure is variable depending on the size of the nozzle used and vacuum to be produced.

Where lower  vacuums are desired, or where it is not economical to do the entire job of evacuation in one stage, multistage Steam jet ejector are used. Here the discharge of the primary stages enters the suction chamber of the succeeding stages either directly or through an inter cooler placed between the stages.  Precoolers  are sometimes placed ahead of the first stage  Steam jet ejector to remove condensable vapors before they enter the ejector, thereby reducing its size and steam consumption.

Single-stage ejectors are suitable where moderate vacuum is desired, after which two-stage ejectors are used. Steam jet ejector of this  type require little maintenance and are relatively trouble-free in operation, and, consequently, they have been universally accepted for this operation. The steam-air ejector has virtually replaced all other forms of air removal devices. In most condenser installations, the vacuum to be maintained is greater than can be obtained economically by a single stage ejector. Two-stage Steam jet ejector usually have some type of condenser between them to condense the steam and condensable vapors from the first stage.

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