Multi-Stage Ejectors: Reliable Vacuum Service for the Process Industries
Used extensively throughout the process industries, steam ejector vacuum systems offer a reliable and economical means of handling high volumes of gas and vapor streams at low pressures. The primary advantage of installing ejectors versus mechanical pumps is the ejectors’ simplicity of operation, low first cost, and ability in handling wet, corrosive and contaminated loads in the most difficult operating conditions. Ejectors are virtually maintenance free and can be constructed from a wide variety of steel, alloy, and composite materials. Croll Reynolds ejector systems are custom designed to our clients’ specifications to optimize operating efficiencies. The steam ejector has four component parts, a nozzle holder, a steam nozzle, steam chest and a diffuser. Steam ejectors are virtually maintenance free and can be constructed from a wide variety of steel, alloy, and composite materials to include PP, PTFE, and PVDF.
The steam-jet ejector is a device designed to convert the pressure energy of a motivating fluid to velocity energy in order to entrain the suction fluid and then recompress the mixed fluids by converting velocity energy back into pressure energy. It is based on the theory that a properly designed nozzle followed by a properly designed throat or venture will economically make use of the high-pressure fluid to compress from a low-pressure region to a higher pressure. This change from pressure head to velocity head is the basis of the jet vacuum principle.
Staging Ejectors. Ejectors are staged from single to six stage designs and are normally designed with condensers between stages. Condensers are either direct contact or shell and tube designs.The number of ejector stages is determined by the level of vacuum required. For high-volume, low-pressure applications ejectors are the chosen vacuum technology for the worldwide process industries.
- Reliable service
- Handles high volumes of gasses and vapors at low pressures
- Handles liquid and particulate
- No moving parts
- Low cost vs mechanical pumps
- Easy to install and maintain
- Easy to retrofit or upgrade