A Variable Flow Erectors are pneumatically / Electrically operated single nozzle ejectors, used to handle the variable suction ad discharge conditions wherein pneumatically / electrically operated needle goes in and out for precise controlling the flow rate based on pressure requirement. It is very useful when a low pressure steam is compressed to a higher pressure level.
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Vacuum is necessary during various steps of edible / vegetable oil and food processing. These steps essentially include hydrogenation, fractionation, bleaching, deodorization and deacidification. Out of all vacuum equipments, Ejector Vacuum System has established the superiority and versatility of their use as compared to mechanical vacuum pumps. The most outstanding advantage of the Steam Jet Ejector is total absence of moving parts which eliminate mechanical breakdown, and assures constant and dependable operation with freedom from repairs. No adjustment or lubrication is required nor are any specially trained operator necessary as their operation is very simple. Over and above, Steam Jet Ejector Vacuum System convey at very high velocity which are many times the speed of sound, they are capable f handling large volume under vacuum thus making them eminently suitable for deodorization application wherein high quality of open / sparging steam has to be handled.
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Large industrial plants often vent significant quantities of low pressure steam to the atmosphere, wasting energy, water, and watertreatment chemicals. Recovery of the latent heat content of lowpressure steam reduces the boiler load, resulting in energy and fuel cost savings. Lowpressure steam's potential uses include driving evaporation and distillation processes, producing hot water, space heating, producing a vacuum, or chilling water. If the steam pressure is too low for the intended application, a steam jet thermocompressor can boost the pressure and temperature to the required level. Operating Principles - Thermocompressors and ejectors operate on the same thermodynamic and physical principle energy contained in high pressure steam can be transferred to a lower pressure vapor or gas to produce a mixed discharge stream of intermediate pressure.
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The efficiency of a Steam turbine is mainly determined by the pressure of the steam at its outlet. The Turbine Surface Condenser is therefore maintained under vacuum. To enable this, the Steam Jet Ejector Vacuum System must be capable of removing all non condensable and associated water vapour from the Surface Condenser to produce the minimum steam condensing pressure consistent with physical dimensions and heat transfer and to provide for deaeration of the condensate. The sources of non condensables include air leakage through all system components operating below atmospheric pressure, gases released from feedwater drains and vents admitted to the condenser, gases released for makeup admitted to the condenser, condensate surge tank when utilized in a closed cycle and disassociation of feedwater into oxygen, hydrogen and non condensables.
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Based on the process requirement, a Multi Nozzle Ejectors can be designed five or seven nozzles type. Generally, one nozzle in the centre and remaining four or six nozzles are evenly circled around it. Multi Nozzle Ejectors can reduce the steam consumption by 15% to 20% as compared to Single Nozzle Ejectors when designed for the same conditions and it is more efficient to single nozzle ejectors. At times it is also considerably shorter in length when compared with same rated single nozzle ejectors.
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