Issues related to the initial calculation of the jet mixer μ
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Design a jet mixer, given that the working steam pressure is 1.0 MPa.A, the inlet gas (flash vapor) pressure is 0.2 MPa.A, and the outlet gas pressure is 0.7 MPa.A； In accordance with the design specifications for petrochemical steam-jet evacuators SH/T 3118-2000, the initial estimated jet coefficient μ is used, with a compression ratio of K=0.35 and an expansion ratio of E=5 ； But if the expansion ratio is less than 10, μ cannot be selected as shown in the figure below; what should be done?
Compression ratio 3.5, expansion ratio 5; the injector doesn’t have that capability! I can’t do it!
Does the expansion ratio always have to start at 10? What if the expansion ratio is less than 10, without taking the compression ratio into account?
With an excessively high compression ratio and an excessively low expansion ratio, the ejector will no longer draw in air. The compression ratio can be reduced, for example by lowering it to 2.