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liquid jet ejector .pdf

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Liquid Jet Ejector
Liquid Jet Ejectors are specially designed to operate using water, solvent or any other clear
liquid and generate vacuum corresponding to the vapor pressure of the liquid. They are very
useful for applications when expensive process fluid is to be recovered. They are most
suitable for low non-condensable and high condensable loads in applications like distillation
and evaporation. External heat exchanger can be provided to maintain liquid temperature in
accordance with vacuum requirement. For higher vacuum, liquid jet ejector can be utilized
along with a steam jet ejector combination system. The whole system can be supplied as a
pre-assembled skid mounted unit for quick installation.
Liquid jet ejectors are jet pumps, motivated by a high pressure liquid. They use the kinetic
energy of the pressure liquid to entrain gases and vapors, slurries and other liquids or granular
solids and then discharge the resultant mixture against a counter pressure.

Operating through converting the kinetic energy of moving water into velocity energy, this
ejector is widely used in oil & petroleum sector. There are different models in which these
ejectors are available for our clients. Manufactured from high end quality metals and
components, these Liquid Jet Ejectors are widely recognized for their high operational
fluency, low maintenance and high productivity.
Liquid jet vacuum ejectors convey and compress gases or vapours with the aid of a liquid
motive fluid. During this action vapours - corresponding to pressure- and temperature ratios can be partially or completely condensed.
Liquid jet vacuum ejectors consist - as far their function is concerned - of 3 main parts:
motive nozzle, mixing zone and diffuser. These three components form a flow path with an
extremely varied cross-section for the motive medium, water or any other liquid.
The motive nozzle's shape causes a transformation of pressure- into speed energy, the
diffuser's shape then effects a re-conversion of kinetic energy into pressure energy. If the
motive medium now flows through these three seriesconnected ejector components as a result
of the total pressure difference between motive pressure ptr and the necessary lower
counterpressure pd, the result will be a static pressure at the end point of the motive nozzle

which will be considerably lower than counterpressure pd and motive pressure ptr. At this
point the suction flow is introduced into the ejector.
Liquid jet vacuum ejectors can extract gases and vapours and compress them. In the case of
liquid jet vacuum ejectors the achievable suction pressure at zero load corresponds more or
less to the vapour pressure of the motive liquid.

When transporting gases with water or another liquid as motive flow we have two media with
very different specific weights. Therefore not only the liquid's pressure energy has to be
transformed into speed energy but the jet itself must also be torn apart so far as to include the
gas components. This duty is fulfilled by means of a suitable spiral in the motive nozzle. The
liquid jet leaves the nozzle at high velocity, entrains the surrounding gas into the mixing zone
and delivers it to the required counterpressure in the diffuser (normally this is atmospheric
pressure). During this action condensable vapours can be condensed or gas components can
be absorbed in the motive liquid.
Liquid jet vacuum ejectors should be mounted in a vertical position with the flow direction
from top to bottom. Pipelines can be installed in the respective nominal connection widths. A
reduction in performance of approx. 15% must be considered if the ejector is mounted in a
horizontal position. For normal installation a down pipe of approx. 1 m in length should be
after-connected and should lead into an overflow vessel and be submerged there at least 1x
the pipe diameter. The free liquid surface in the overflow vessel should be at least 5 times the
pipe crosssection.If required, a standard separator to separate gas and motive liquid can also
be supplied.
For more information please contact us or call on +912532501600 / 9921391762

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