We supply both barometric and shell-and-tube surface condensers for this purpose. Condensing of motive steam greatly improves Ejector Set efficiency.
In practice, for suction pressure below 150 mbar absolute, more than one ejector will be used, usually with condensers between the ejector stages.
3 or more stages requires condensing (anything below 65 mbar(A)). Condensing and non-condensing ( up to 65 mbar(A)) Note that these are intended to demonstrate the concept - Ezejector programs are much more comprehensive. These ratios are computer calculated and are the key parameters in ejector design.Įjectors use steam to generate vacuum and can be single or multi-stage: Download Free Demo Ejector Design programs below, for steam ejectors and flare gas recovery. If Ws kg/hr motive steam are required to entrain and compress Wl kg / hr of load vapours, we define the entrainment ratio for this ejector as Wl/Ws. We define the compression ration for this ejector as P2/P1. The load gases have been compressed from their original pressure P1 to a new pressure, P2. Upon leaving the throat, the gases slow down and regain pressure to a pressure P2. the low pressure, high velocity steam from the nozzle, together with the slower, entrained load vapours, will mix as they converge into the throat of the ejector. The low pressure induces a flow of load vapours at a pressure (P1) into the ejector. Results compare favourably with actual ejector installations, see graph to the left.Steam at pressure Pi expands through a nozzle and exits at very low pressure (Px) and at very high velocity. The model has been tested extensively and is easy to use. The Spirax Sarco thermocompressors are a specific type of ejector in which steam under pressure (motive) is used to entrain steam that is at a lower pressure (suction). The ratio of entrained gas flow rate to motive gas flow rate (entrainment mass ratio) 
Geometrical studies showed current ejector design guidelines.
Motive gas flow rate, pressure, temperature and properties (molecular weight, Cp/Cv)Įntrained gas properties (molecular weight, Cp/Cv), pressure and temperature Simulations of an ejector that is part of a steam-jet refrigeration cycle were used to. Thermodynamic models, Continuity equationsĮfficiencies of each step within the ejector based on correlations T he ejector computer model includes the following: "I was able to prepare a very successful solution!ĮZEJECTOR is a computer model for gas ejector and steam ejector design that has been developed based on a unique approach using fundamental principles. "According to program steam flow and sizing seems perfect!" "Your software is very well designed and easy to use with plenty of great info." "Before including a compressor or pump in your process design, would you fill in your request, send it to a supplier and then cool you heels waiting for a reply? So don't do this for an ejector."Īvoid the time lost, develop your own solution
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