Publication date: 2018-04-20 23:35
Three stage systems are also usually of the Condensing type. Again as per the Two Stage system, condensers can be used as pre-condensers, inter-condensers, and after-condensers in order to reduce the gas load being passed on to the next ejector stage. Depending up on the application Non-condensing systems can also be used however this is less efficient than Condensing Types as each ejector must entrain the full gas load from the previous stage.
Ejectors range from Single upto Six Stage units, and can be either Condensing or Non-Condensing types. The number of Ejector stages required are usually determined by the economy of the ejectors and the level of vacuum required. The operating range for each stage of Vacuum Ejector can be seen below, also for reference 6 BarA = 765 mm HgA.
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Vacuum Ejectors are used in a variety of applications in the process, food, steel and petrochemical industries. Typical duties involve filtration, distillation, absorption, mixing, vacuum packaging, freeze drying, dehysrating and degassing. Ejectors will handle both condensible and none condensible gas loads as well as small amounts of solids or liquids, however accidental entrainment of liquids can cause a momentary interruption in vacuum but this will not cause damage to the ejector.
Single stage Vacuum Ejectors generally cover vacuum ranges from 85mm HgA up to atmospheric pressure. To maximise performance eight different designs are available with each ejector being optimised to operate in a specific vacuum range. This allows the motive steam consumption to be kept at a minimum for the selected ejector, and also ensures that operation will be stable. All single stage ejectors are designed to discharge either at or slightly above atmospheric pressure. Sizes range from 6 Inch to 6 Inch, however large size are available if required. Standard materials of construction are carbon steel or stainless steel, both of which are fitted with a stainless steel nozzle.
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Three stage Vacuum Ejectors generally cover vacuum ranges between HgA to 75mm HgA, however depending up on actual operating conditions a Two Stage Ejector system may be more economical if at the upper limit of the operational envelope, or a Four Stage Ejector system if conditions are at the lower end.
Staging of Ejectors is required for more economical operation when the required absolute vacuum level is reduced. Two stage Vacuum Ejectors generally cover vacuum ranges between 8mm HgA to 685mm HgA, however depending up on actual operating conditions a Single Stage may be more economical if at the upper limit of the operational envelope, or a Three Stage Ejector System if conditions are at the lower end.
In operation a Three Stage system consist of a primary Booster, a secondary High Vacuum (HV) Ejector, and a tertiary Low Vacuum (LV) Ejector. As per the Two Stage System, initially the LV ejector is operated to pull vacuum down from the starting pressure to an intermediate pressure. Once this pressure is reached the HV ejector is then operated in conjunction with the LV ejector to pull vacuum to the lower intermediate pressure. Finally the Booster is operated (in conjunction with the HV & LV Ejectors) pull vacuum to the required pressure.