Analysis of Constant Pressure Steam Generation

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Presentation transcript:

Analysis of Constant Pressure Steam Generation P M V Subbarao Professor Mechanical Engineering Department Identification of Right Avenues …..

2 – 3 : SG: Isobaric Heating : p3 = p2 QCV 3 2 No work transfer, change in kinetic and potential energies are negligible Assuming a single fluid entering and leaving…

Constant Pressure Heating Process

The Power Gods W J M Rankine ~ 1860 ~1820 : Sadi Carnot =0 Constant Pressure Heat Addition:

Analysis of Constant Pressure Steam Generation Specific Pressure Enthalpy Entropy Temp Volume MPa kJ/kg kJ/kg/K C m3/kg 1 3500 7.79 509.9 0.3588 2 5 7.06 528.4 0.07149 3 10 6.755 549.6 0.03562 4 15 6.582 569 0.02369 20 6.461 586.7 0.01776 6 25 6.37 602.9 0.01422 7 30 6.297 617.7 0.01187 8 35 6.235 631.3 0.0102

Constant Pressure Heating Process Vapour Liquid +Vapour h Liquid s

Constant Pressure Heating Process

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

Ideal Rankine Cycle

Ideal Rankine Cycle : p-h Diagram 3 2 1 4

Ideal Rankine Cycle : P-h Diagram 1 2 3 4 1 2 3 4 1 2 3 4

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

Ideal Rankine Cycle : P-h Diagram Tmax=5500C pmax=17Mpa Tmean=284.40C 1 2 3 4 1 2 3 4 pmax=5Mpa Tmean=246.30C

Turbine : Isentropic Process :s4=s3 No heat transfer. Change in kinetic and potential energies are negligible Assuming a single fluid entering and leaving…

4 – 1 : Condenser : Isobaric Cooling : p4 = p1 QCV 4 1 No work transfer, change in kinetic and potential energies are negligible Assuming a single fluid entering and leaving…

Analysis of Cycle First law for a cycle:

The Rankine Cycle smin smax

Ideal Rankine Cycle : P-h Diagram Tmax=5500C pmax=17Mpa h=42.05% Tequi=284.40C 1 2 3 4 1 2 3 4 pmax=5Mpa h=37.8% Tequi=246.30C