Ejector Systems can be described as pumps without moving parts. It works by compression of gases vapors, liquids or solids which acts as the motive force. Which means that the system operates by converting pressure energy into velocity. Ejectors are simple pieces of equipment used to create a system to vacuum and is used many industrial processes such as degassing, desalination, deodourising, distillation columns, evaporation, fractionating, freeze drying, turbine condensing and vacuum cooling.
Ejectors use air within the wells to produce a vacuum to draw water out. This is based on a system of wells which are drilled to lower the groundwater level to provide stable working conditions. It works by circulating high pressured water which is fed from a tank and supplies pumps at ground level. It then goes into the ejector nozzle located at the foot of a well. Which is then piped back to ground level and back to the supply pump for recirculation.
Type of Ejectors
- Ejector: 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 pressure.
- Booster: Ejector designed to compress large quantities of water vapour
- Thermocompressor: An ejector designed to compress large quantities of vapour
- Exhauster: An ejector in which the suction fluid is a gas. The motive fluid may be a liquid or a gas.
Ejector systems range from the simple, single-ejector stage to very complex systems with as many as six ejectors. Its available in the following:
- Multiple-nozzle designs
- Single-nozzle units with an automatic spindle for special applications
- The single-nozzle, fixed orifice which is the simplest type of ejector.