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Impact of Cycle Design on Steam Generator

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Presentation on theme: "Impact of Cycle Design on Steam Generator"— Presentation transcript:

1 Impact of Cycle Design on Steam Generator
P M V Subbarao Professor Mechanical Engineering Department The strongest Measures of Development….

2 Basic The Theme Steam Generator Design
Constrains: Imposed by Cycle Design (pmax, Tmax, etc.) Fuel Combustion Related. Heat Transfer Related Safety and Reliability Related.

3 The Basic Rankine Cycle

4 Gas to Liquid Heat Exchange
Liquid Heating

5 The Power Gods ~1760 : James Watt ~1820 : Sadi Carnot
George Brayton & W Rankine ~ 1860

6 Law of Power Generation
Coal (Source) Power Plant --Cycle Design -- Equipment Design --Equipment Operation Land, Water & Air (Sinks)

7 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

8 Role of SG in Rankine Cycle
Perform Using Natural resources of energy …….

9 Impact of cycle on Construction of Steam Generator
Superheater Evaporator Economizer

10 Trends in coal-fired generation : Performance
The average efficiency of coal-fired generation is projected to increase from 34% in 2006 to 36% in 2015 and to 38% in 2030. In the OECD, efficiency increases from 37% to 41%. In non-OECD countries, efficiency improves from 31% to 37% because new coal-fired power plants built to meet rapidly growing electricity demand are expected to be far more efficient than existing ones.

11 Modern Measure of Performance

12 The Rankine Cycle

13 Pump : Isentropic Process
1 2 SSSF: Conservation of mass First Law : No heat transfer, change in kinetic and potential energies are negligible

14 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…

15 Constant Pressure Heating Process

16 Constant Pressure Heating Process
Vapour Liquid +Vapour h Liquid s

17 Ideal Rankine Cycle

18 Constant Pressure Heating Process


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