Ejector, Hogger system and Vacuum in Condenser
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- Опубліковано 5 січ 2025
- Hello Power Engineers
Welcome to power plant guru for new video on ejector and vacuum in condenser. This video explains working principle of ejector in steam turbine-based power plants. This is a very important device and young engineers find it difficult to understand.
Based upon Bernoulli’s Principle, as the velocity of a fluid increases, its pressure decreases, and vice versa.
An Ejector works by accelerating a high pressure stream (the ‘motive’) through a nozzle, converting the pressure energy into velocity. Around the nozzle tip, where velocity is highest, a low pressure region is created. This is often called the suction chamber of the Ejector. Where the pressure in this region is lower than the pressure of the suction fluid connected to the Ejector side-inlet or ‘suction branch’, it will be entrained/sucked into the body of the Ejector. The two fluid streams then travel through the diffuser section of the Ejector, where velocity is decreased as a result of the diverging geometry and pressure is regained.
Importantly, the low pressure suction stream experiences a pressure increase/compression, whilst the motive stream sees a decrease in pressure, as some of its energy has been used to ‘do work’ on the suction stream. The resultant discharge pressure is therefore somewhere between the motive and suction pressures.
Great Summary!! Thank you
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Why a hogger is needed initially, when ejector can do the same job!
Hello Durga
Hogger is also one kind of ejector, but it's size and steam consumption is higher and it is required when there is no vacuum in condenser and you need more power to establish the initial vacuum. Once you have established the initial vacuum then there is only requirement of only to maintain which may be small as.compared to initial requirements.
When starting up your sjae would you open your Steam or Air first and why?