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Incondensible gases, are gases that do not condense and do not dissolve readily in hot water. Steam ejectors are used to remove these gases from a condenser.
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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 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.
Why used hogger and ejector in steam turbine?
A steam turbine condenser equipped with ejectors is usually fitted with two ejectors. The larger of the two is called the hogger and the smaller the huffer. Steam turbines are designed for efficiency and thus attempt to extract as much energy from the steam passing thru as is physically possible. Energy is extracted as both temperature and pressure decrease. The lower the temperature and pressure at the steam turbine's exhaust the more energy can be extracted from the steam. For this reason it is desirable for the steam turbine condenser (the exhaust) to be at the lowest temperature and pressure possible. The hogger, or hogging jet, is a large steam powered ejector that causes the steam condenser to operate under a near perfect vacuum whilst the steam turbine is in the start-up phase. In steady state operation the cooling effect of the condenser cooling water of the steam causes the condenser to operate under a nearly self sustained vacuum. The hogger is necessary in the start-up phase to prevent steam from condensing to water in the final stages of the turbine before the steam flow and cooling effect of the condenser can establish vacuum. The huffer or huffing jet runs continuously whilst the turbine is operating to remove any non-condensable gasses (i.e. air) that might leak into the condenser. It is nearly impossible to perfectly seal a condenser and turbine from air-in leakage. It should be noted that modern, large steam turbines do not employ steam ejectors to establish and maintain condenser vacuum. Modern designs utilize motor driven mechanical vacuum pumps.
Difference between hogger and ejector of condensing turbine?
A Hogger is a device to remove the Air from Turbine inside for creating initial vaccume for start up the turbine means create negative pressure inside Turbine or say creates less pressure than atmospheric pressure in Turbine.An Ejector is a device used in Power plant to remove Undissolved gases from Condenser to avoid any harm to system from these gases.If any correction is required pl. correct it.
What is the purpose of air ejector?
To remove air and noncondensable gases from a main steam condenser
What is the working principle of steam jet air ejector?
what is the woking principal of steam jet ejector? limitation of steam jet ejetor?
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.
Why steam ejector placed on height?
can remove hydrocarbon safely
How does multi-stage steam jet air ejector works?
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 mdvprasad007@gmail.com
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
What is the working principle of steam jet ejector?
it is not based on bunoullies theorem it is based on mach number.when sonic speed of steam converted to supersonic steam by nozzle vacuum is created.
What is dearater in power plant?
It removes the gases present in the steam,given by heaters.dearater is necessary otherwise the gases in steam will corrode the boiler and also affect the turbine.
What is the function of ejector in steam turbine?
An ejector pump is a tool used usually in basements when the sewer fails to flow beneath the basement floor. Basically the function of this tool is to pump water so that the sewer in the basement could work continually.
What is dearater in thermal power plant?
It removes the gases present in the steam,given by heaters.dearater is necessary otherwise the gases in steam will corrode the boiler and also affect the turbine.
What is a vent in foundry?
Vent is an opening provided for gases to escape from the moulding box. The gases are formed during solidification of the metal.i.e, when the metal is cooled ,the earlier high temperatures will lead to the formation of steam ,this steam is converted into gases to be escaped.
What are openings from which hot steam gases and ashes are ejected?
volcanoes
