The issue of steam mass affecting steam jet vacuum pumps
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Both the temperature and pressure of the steam affect the performance of jet vacuum pumps. Could someone explain this in detail? Is this explanation correct: High pressure has little impact on performance, as the equipment parameters are fixed, so high pressure is meaningless? ； The pressure is too low; a high-speed jet cannot be formed at the nozzle, which affects the vacuum capacity ； Excessively high temperatures have no effect on performance, but they are not good for the equipment ； If the pressure is too low, liquid droplets will enter the nozzle; after leaving the nozzle, due to the sudden decrease in pressure, these droplets evaporate instantly into steam, occupying some of the air space and thus affecting the vacuum level.
Well said. 1. The steam pressure must reach the designed pressure； 2. The steam must be in a saturated state.
The steam pressure is higher than the designed pressure, resulting in steam waste； The steam pressure is high, so the exhaust pressure also increases; however, the pumping capacity first rises slightly and then decreases ； The steam pressure is below the design pressure, the steam flow rate decreases, the exhaust pressure also drops, and the pumping capacity increases slightly ； With a high superheat, the flow rate of power steam decreases, the pumping capacity drops, and the exhaust pressure also falls.