Regenerative Rankine Cycle

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Presentation transcript:

Regenerative Rankine Cycle P M V Subbarao Professor Mechanical Engineering Department Carnotization of Practicable Cycles for PGS…..

Carnotization of Rankine Cyce Supercritical Steam Generation Liquid Liquid +Vapour Vapour h mfuel s

Reassessment Thru Carnot Model

Diagnosis of Heat Addition Rankine Cycle

Diminishing Local Work Conversion

Diminishing Marginal Work Generation wturbine

Diminishing Local Efficiency

What about a Non-Isentropic Expansion !!! 4 A Macro Carnot Cycle !!!! 3 5 T 2 6 1 7 s

Ideal Regenerative Cycle 4 5 6 7 3 2 1

Regenerative Turbine 4 7 T Regenerative heat transfer. Change in kinetic and potential energies are negligible Assuming a single fluid entering and leaving…

Analysis of Regeneration Cycle 1 2 4 5 6 7 3

Regeneration Cycle with Bleeding Turbine & Mixer (Open Feed Water Heater)

Analysis of mixing in OFWH Constant pressure mixing process Constraint: Maximum allowable value of h3 is hsat @ p3 Conservation of energy:

Analysis of Regeneration through OFWH

Cost to Benefit Ratio for Regenerative Rankine Cycle

Performance of OFWH Cycle ~ 12MPa hreg pbleed, MPa

Clues for Optimal Location of FWH

Comparison of Performance of Bleed & Condensing Steams hcond hbleed Pregen, MPa

Gross Work output of bleed Steam ~ 12MPa wbleed pregen, MPa

Workoutput of bleed Steam Fractional specific output Fraction of Bleed Steam

Workoutput of bleed Steam wbleed

Progress in Rankine Cycle Year 1907 1919 1938 1950 1958 1959 1966 1973 1975 MW 5 20 30 60 120 200 500 660 1300 p,MPa 1.3 1.4 4.1 6.2 10.3 16.2 15.9 24.1 Th oC 260 316 454 482 538 566 565 Tr oC -- FHW 2 3 4 6 7 8 Pc,kPa 13.5 5.1 4.5 3.4 3.7 4.4 5.4 h,% ~17 27.6 30.5 35.6 37.5 39.8 39.5 40

Thermodynamic Analysis of A Power Plant

Block Diagram of A Large Steam Turbine Main Steam Reheat Steam HP IP LP Steam for Reheating OFWH 4 CFWH 3 CFWH 2 CFWH 6 CFWH 5 CFWH 1 Condenser