Rankine Cycle for Power Generation By P M V Subbarao Mechanical Engineering Department I I T Delhi An appropriate amalgamation of Theory and Practice.

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Presentation transcript:

Rankine Cycle for Power Generation By P M V Subbarao Mechanical Engineering Department I I T Delhi An appropriate amalgamation of Theory and Practice !!!!

Ideal Rankine Cyclic Model for Power Generation System

Constant Pressure Steam Generation

Constant Pressure Steam Generation Process Constant Pressure Steam Generation: =0 Theory of flowing Steam Generation

Knowledge for Energy Audit Constant Pressure Steam Generation: Practical way of understanding the use of fuel energy: Is it possible to get high temperature with same amount of burnt fuel? What decides the maximum possible increase for same amount of burnt fuel?

The Law of Learning one fourth from the teacher, one fourth from own intelligence, one fourth from classmates, and one fourth only with time. Mahabharath

Carnot’s View of Rankine Cycle Creation of Temperature at constant pressure :

Phase Behavior & Expenditure Vs Wastage h s Liquid Liquid +Vapour Vapour

Variable Pressure Steam Generation s h

Specific PressureEnthalpyEntropyTempVolume MPakJ/kgkJ/kg/KCm3/kg Analysis of Steam Generation at Various Pressures

More Availability of Energy for Turbine : Healthy Muscles Specific TempPressureVolumeEnthalpyEntropy CMPam3/kgkJ/kgkJ/kg/K

Behavior of Vapour At Increasing Pressures All these show that the sensitivity of the fluid increases with increasing pressure.

Creation/Reduction of Wastage

Less Fuel for Creation of Same Temperature

Availability of Steam for Condenser Temperature of 45 0 C Turbine Inlet : 3500 kJ/kgTurbine Exit Specific Available PressureEntropyTempVolumeEnthalpyQualityEnthalpyWork MPakJ/kg/KCm3/kgkJ/kg

Ideal Rankine Cycle : p-h Diagram

Ideal Rankine Cycle : P-h Diagram

Analysis of Steam Generation Process Heat Addition in Steam Generator, q in Define entropy based mean

First Law Analysis of the Rankine Cycle Main components of the above cycle are: 1) Pump – Generate high Pressure water. 2) Boiler (steam generator) – heat exchanger 3) Turbine – generates mechanical power 4) Condenser – heat exchanger

Pump : Adiabatic Process SSSF: Conservation of mass First Law : No heat transfer, change in kinetic and potential energies are negligible  

For SSSF Process: Liquids are incompressible, change in volume per unit change in Pressure is negligible.

Pumping of Incompressible Fluids Adiabatic pumping of a liquid is almost an Isothermal process!!