Method: Vary net vapor rate, no make-up gas.
Process: Vacuum systems. Must always have vapor product.
Advantages: All ejector discharge available for recycle. Often gives the most stable operation.
Disadvantages: Difficult to implement in systems with the ejector directly attached to its condenser. Relatively large recycle line and control valve often required.
Application: The best ejector pressure control system for ejectors that are not stable to zero load. Often the most economical system for stable ejector control.
Variants: Recycle to upstream of condenser: requires process compatible with water and water removal in condensate drum.
Operation: Recycle gas moves the vacuum jet ejector along its operating curve. The higher the load to the ejector, the higher the ejector suction pressure.
Return to Table of Methods
Return to consolidated paper list