Machines to Convert Shaft Power to Micro Kinetic Power…….

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Presentation transcript:

Machines to Convert Shaft Power to Micro Kinetic Power……. Analysis of Pumps P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Machines to Convert Shaft Power to Micro Kinetic Power…….

Major equipment in A Power Plant

Pump services in Main Steam Cycle Turbogenerator and auxiliaries Condenser circulating pumps Screen wash-water pumps Cooling tower make-up pumps Steam generator equipment Condensate pumps Condensate booster pumps Boiler-feed pumps Boiler-feed booster pumps Deaerator make-up pumps Heater drain pumps (low and high pressure)

Layout of Turbo-Generator Cycle

Expectations from A Condensate Pump Duty: Generate Required Open Feed water Heater Conditions ! Condensate Pump Hot Well Rhyd,1 Rhyd,2 Rhyd,n pOFWH+ploss OFWH

Expectations from A Boiler Feed Pump To Generate Required Live Steam Conditions ! plive steam Steam Turbine Rhyd,1 Rhyd,SG Rhyd,n ploss+plive water BF Pump OFWH / DA

Cross-section, single 48.5 MW boiler feed pump, 1300 MW fossil power plant

Power Losses in Pump Head losses due to suction and delivery pipe fittings, entrance losses, impeller frictional losses and casing frictional losses. Power loss due Leakages and recirculating fluid. Disc Friction loss Mechanical Losses

Machine-Fluid Matching Parameter Design Parameter

SELECTION OF SPEED A pump/fan with a given flow geometry and momentum transfer principle

Selection of Geometry Vs Specific Speed

Specific Speed Vs Flow Geometry& Principle of Momentum Transfer Mixed Axial Flow / Airfoil Action Radial Fow/ Centrifugal Action

Specific Speed Vs Pump Losses

Specific Speed Vs Total Power Loss

Anatomy of A Centrifugal Pump/Fan : Low Ns Discharge Nozzle - K Impeller - J Shaft - C Eye of Impeller - G Casing - F

Basic Structure of Centrifugal Pump/Fan

High Flow Rates : Pumps in Parallel

Axial Flow Pump Stage

Multi-stage Pumps

Layout of A General Pump

Basic Erection of A Pump STATIC SUCTION HEAD

Water Flow Path in A Pump

Variation of Absolute Pressure inside A Pump pabsolute Flow Path

NPSH NPSH

Loss of NPSH

Available NPSH At Site Kinetic power mVs2/2 Frictional loss in suction piping

Specific Speed Vs Suction Velocity