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A steam ejector is a pump-like device, with no moving parts or pistons, that utilizes high-pressure steam to compress vapours or gases. This creates a vacuum in any vessel or chamber connected to the suction inlet of the ejector
The adjacent diagram depicts a typical modern ejector. It consists of a motive fluid inlet nozzle and a converging-diverging outlet nozzle. In this case of a steam ejector, the motive fluid is high-pressure steam. The Venturi effect, a particular case of Bernoulli's principle, applies to the operation of this device. The high-pressure steam is converted into a high-velocity jet at the throat of the convergent-divergent nozzle which creates a low pressure at that point. The low pressure draws the suction fluid (a vapour or gas in this case) into the convergent-divergent nozzle where it mixes with the high-pressure steam. In essence, the pressure energy of the inlet steam is converted to kinetic energy in the form of velocity head at the throat of the convergent-divergent nozzle. As the mixed fluid then expands in the divergent diffuser, the kinetic energy is converted back to pressure energy at the diffuser outlet in accordance with Bernoulli's principle. The compression ratio of the steam jet ejector, P2/P1, is defined as ratio of the ejector's outlet pressure, P2, to the inlet pressure of the suction vapour or gas, P1. The entrainment ratio of the steam jet ejector, Ws/Wv, is defined as the amount of motive steam, Ws (in kg/hr), required to entrain and compress a given amount, Wv (in kg/hr), of suction vapour or gas. The compression ratio and the entrainment ratio are key parameters in designing a steam jet ejector. In practice, for suction pressure below 100 mbar absolute, more than one ejector will be used, usually with condensors between the ejector stages. Condensing of motive steam greatly improves ejector set efficiency. Both barometric and shell-and-tube surface condensers are used for this purpose. BY M.D.V.PRASAD
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∙ 16y ago
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What is multistage reciprocating air compressor?
A multistage reciprocating air compressor is a compressor that compresses air in a number of stages. A multi-stage reciprocating air compressor may contain 2 or many cylinders, like low pressure, medium pressure and high pressure cylinders.
How does turbine work?
Steam or water, it works the reverse of a fan, where the fan pushes air down, the turbine is turned by the steam or water. there's a shaft leading from the turbine to the generator, which produces the electricity
How pneumatic or hydraulic systems are used in a pneumatic sand or paint blaster?
Air pressure is used as ejector for the sand blasting.
What is glandsteam?
Gland steam is used in engineering to prevent air from entering the steam chest.
How does pneumatic air gun work?
it works with compressed air
What is the working principle of steam jet air ejector?
what is the woking principal of steam jet ejector? limitation of steam jet ejetor?
What is the purpose of air ejector?
To remove air and noncondensable gases from a main steam condenser
How air ejector maintains vacuume in condenser in thermal power plant?
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.
What are the reasons of failure of steam jet ejector Steam jet ejector is not able to sustain vacuum.Why?
Check the seals and connections for a leak allowing air to infiltrate and thus causing loss of a vacuum VERY common problem as the coefficient of expansion per degree causes havoc on metal to metal connections such as a pump connected to ejector housing
The principle of an air ejector?
The primciple of the air ejector is to exhaust the air remaining from the processor in excess amount.
What has the author Jaber Mohamad Adnan Dandachi written?
Jaber Mohamad Adnan Dandachi has written: 'Steam air ejector performance and its dimensional parameters'
What is the connection between an air ejector and an air conditioner?
About 20°.
What is the connection between an air ejector and asbestos?
There is no connection between an air ejector and asbestos, unless asbestos dust is present for some reason. Then the working of an air ejector might be one way in which the asbestos dust can become airborn and available for people to inhale.
What is multistage reciprocating air compressor?
A multistage reciprocating air compressor is a compressor that compresses air in a number of stages. A multi-stage reciprocating air compressor may contain 2 or many cylinders, like low pressure, medium pressure and high pressure cylinders.
How does steam turbine works?
Steam or water, it works the reverse of a fan, where the fan pushes air down, the turbine is turned by the steam or water. there's a shaft leading from the turbine to the generator, which produces the electricity
Which car had an ejector seat?
James Bond's Aston Martin DB5 had an ejector seat. When he wanted to get rid of someone, Bond pressed a button. As obvious as it is, the passenger was shot into the air!
How do you make steam in alchemy classic?
steam and air.
