Sistemas de Vacío

EJECTORS
THERMOCOMPRESSORS
MULTISTAGE VACUUM PACKAGES
STEAM DESUPERHEATERS
STEAM TURBINE CONDENSERS
REFERENCES
 
View Brochure
View PDF brochure

EJECTOR: WORKING PRINCIPLE

 

EyectorAn ejector is a vacuum pump, generally driven by steam, without moving parts. It is the simplest of the pumps, although it can produce absolute pressures from one micron to 30 inches of mercury column.

 

The working principle of an ejector is the following: the motive fluid, generally steam, is accelerated inside a convergent-divergent nozzle, which converts pressure into velocity. Because of the Venturi effect, the resulting discharge pressure is very low, which as a result creates a suction of the suctioned fluid into the mixing chamber. The mixture of motive and suctioned fluids then passes into the diffuser, which transforms the velocity into pressure, and we get at discharge a pressure between the motive and suctioned fluid.

 

  BASIC COMPONENTS:

Plano- Suction Chamber.
- Nozzle.
- Mixture diffuser.

 

 

 

 

 

  SELECTION FACTORS:

While the ejector assembly in itself is simple, the design of the nozzle and diffuser are quite sophisticated. The factors to be considered are:
1. Pressure and temperature at ejector suction flange.
2. Discharge pressure required.
3. Nature of the load (composition, corrosive vapours).
4. Required capacity of the ejector.
5. Minimum steam pressure for the ejector system.
6. Maximum water temperature for the condenser (if required).
7. Type of condenser required: barometric or surface.

 

  TYPES OF EJECTORS FOR THE INDUSTRY:

    · Ejector: A general term covering all types of jet equipment with a discharge pressure between the motive steam and the suctioned fluid.
    · Eductor: An ejector in which the motive fluid is a liquid.
    · Syphon: An ejector in which the motive fluid is a condensable gas.
    · Scrubber: Designed to move a gas against a very low differential pressure.
    · Booster: Ejector designed to compress large quantities of water vapour from a relatively low absolute suction pressure to a determined discharge pressure.
    · Thermocompressor: An ejector designed to compress large quantities of vapour from an atmospheric or near atmospherical  suction pressure to a near atmospheric discharge pressure.
    · Exhauster: An ejector in which the suction fluid is a gas. The motive fluid may be a liquid or a gas.

 


  NOISE LEVELS:
The noise level depends in the speed of the steam. Our equipment do not produce more than 80 dBA at 1 m. Depending on the application, sometimes a silencer is needed, which is supplied together with the ejector.

 

  MATERIALS USED IN EJECTORS AND VACUUM SYSTEMS:
Depending of several factors, namely: mechanical properties, chemical resistance, echonomics and purity of product:

 

· Carbon steel · Stainless Steel · Inoxyda 90 · Cu
· Ni · Monel · Titanium · P.V.C.
· Epoxy resin · Nylon · Polypropilene · Glass
· Ceramic · P.T.F.E. · Polyethylene · Graphite


 

 

 

 

  MAIN INDUSTRY APPLICATIONS FOR EJECTORS:

 

Distillation.

Concentration.

Evaporation.

Drying.



Crude oil distillation.

Atmospheric distillation.


Cable drying impregnation.


Protective drying at low temp. of blood.

Antibiotics.


Evaporation.

Concentration.

Dying.


Degassing.

Removing of hydrogen.

Gaseous impurities.

 


Tank drains


Evaporation.

Juices concentration.


Deodorising.

Edible oil drying.


Drawn.

Extrusion.

Injection.

Forming.


Manufacturing of synthetic fibres.

Fabric drying.


Rotative filters of low vacuum.

 

Vacuum Test chambers.

Turbomachinery testing.

Vacuum resistance