Ejektori

Ejektori, also known as ejectors or steam ejectors, are devices used to move fluids (liquids or gases) by entraining them in a high-velocity jet of motive fluid. The most common motive fluid is steam, but compressed air or other gases can also be used. The basic principle of operation involves the Venturi effect. The motive fluid is accelerated through a nozzle, creating a region of low pressure. This low pressure draws in the fluid to be moved (the suction fluid) through an intake port. The two fluids then mix and are further accelerated through a diffuser, where the kinetic energy of the jet is converted back into pressure energy, allowing the mixture to be discharged at a higher pressure than the suction pressure.

Ejektori are simple, robust, and have no moving parts, making them reliable and low-maintenance. They are particularly useful for creating and maintaining vacuum conditions. Applications are widespread across various industries. In the chemical industry, they are used for vacuum distillation, evaporation, and solvent recovery. Power plants utilize them for steam jet air ejectors to remove non-condensable gases from condensers, improving turbine efficiency. Refrigeration systems sometimes employ steam jet ejectors for cooling. They can also be found in food processing, pharmaceuticals, and aerospace testing. The efficiency of an ejector is typically lower than that of mechanical pumps, but their simplicity and ability to handle corrosive or dirty fluids often make them the preferred choice. Multiple ejectors can be combined in series to achieve very high vacuum levels.