Selection of gas turbines
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Selection of gas turbines

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Selection of gas turbines Selection of gas turbines Presentation Transcript

  • Rishabh Boonlia VIT University
  •  High heads(350 m and above): Pelton turbine  Reaction turbines not suitable (losses) Medium heads: Francis turbine (sometimes impulse turbines can also be used) Low heads(below 60 m): Propeller type of turbine is used.
  •  Hydrological Data: „ The maximum working head „ The design Head „ The design discharge Available discharge Speed and nature of load
  •  Type of turbine:(for e.g. adjustable blade axial flow turbine or akaplan turbine) The power generated( in bhp): Diameter of the hydraulic turbine Rotational speed
  • Spiral casings are either made of metal for headsranging from 40 to over 200m or of concrete forlow and medium heads, i.e. up to 75m
  • The role of the draft tube is to convert kineticenergy into pressure energy with a minimum oflosses Straight conical draft tube Elbow draft tube
  • A propeller-type runner rated 28,000 hp (21 MW)
  •  Vertical shaft: (for reaction turbines) Great variations of tail water level Deep foundations, as the weight of the rotating parts acts in the same direction of the axial hydraulic thrust Horizontal shaft: (for impulse turbines) Grouping of two or more runners can be done Foundations are not that deep, but occupy more surface area