Höyrysuuttimet

Höyrysuuttimet, also known as steam ejectors or steam jets, are simple devices used to create vacuum by entraining a gas or vapor. They operate on the principle of fluid dynamics, specifically the Venturi effect and momentum transfer. A high-pressure motive fluid, typically steam, is discharged through a nozzle, creating a high-velocity jet. This jet passes through a specially shaped throat where its velocity is converted into pressure drop, resulting in a lower pressure region. The gas or vapor to be evacuated is drawn into this low-pressure region and entrained by the high-velocity motive fluid. The mixture then passes through a diffuser, where the velocity of the combined fluid is decreased, and its pressure is increased to a level that can be discharged to the atmosphere or a lower-pressure system.

Höyrysuuttimet are valued for their simplicity, reliability, and lack of moving parts, which makes them robust and low-maintenance. They are commonly used in various industrial applications, including vacuum distillation, evaporation, drying processes, and in chemical plants for vacuum generation. They are particularly effective in handling corrosive or dirty gases that might damage conventional vacuum pumps. While they are not as energy-efficient as some other vacuum technologies, their cost-effectiveness and ability to handle challenging conditions make them a preferred choice in many scenarios. Multiple ejector stages can be combined to achieve very high vacuum levels.