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Chapter 4 Properties of Steam and Steam Generators

Chapter 4 Properties of Steam and Steam Generators. Formation of Steam at Constant Pressure. P triple = 0.006112 bar, T triple =273.16°C. P–V Diagram, T–s Diagram, h–s Diagram and P–s Diagram . Steam Generation. Enthalpy Change in Generation of Steam from 0°C at 0°C.

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Chapter 4 Properties of Steam and Steam Generators

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  1. Chapter 4 Properties of Steam and Steam Generators

  2. Formation of Steam at Constant Pressure Ptriple = 0.006112 bar, Ttriple =273.16°C

  3. P–V Diagram, T–s Diagram, h–s Diagram and P–s Diagram

  4. Steam Generation • Enthalpy Change in Generation of Steam from 0°C at 0°C • 0°C to Saturation Temperature • Wet Steam: Wet steam contains partly water as suspended in it and partly steam

  5. Dryness Fraction: Dryness fraction is defined as the mass of dry steam per kg of wet steam. It is represented by x. • Enthalpy • Specific Volume • Internal Energy • Entropy of Water

  6. Entropy of Steam

  7. Throttling Calorimeter

  8. Separating and Throttling Calorimeter

  9. Mollier Diagram or h–S Chart

  10. Steam Generators/Boilers • “A combination of apparatus for producing, furnishing or recovering heat together with apparatus for transferring the heat so made available to water which would be heated and vaporized to steam form” (ASME). • Basis for classification of boilers • Contents inside the tube • Firing system • Position of drum • Pressure • Nature of water circulation

  11. Water Tube and Fire Tube Boilers

  12. Requirements of a Good Boiler • Low cost of installation, operation and maintenance • Easy maintenance • High efficiency • Safety • High transportability • High steam production rate • Good quality of steam • Quick steam generation capacity • Meeting fluctuating demand of steam

  13. Cochran Boiler

  14. Babcock and Wilcox Boiler

  15. Locomotive Boiler

  16. Lancashire Boiler

  17. Boiler Mountings • Safety valve • Water level indicator • Pressure gauge • Fusible plug • Steam stop valve • Feed check valve • Blow-off cock • Man and mud hole

  18. Safety Valves

  19. Sprint Loaded Safety Valve Lever Safety Valve

  20. High Steam Low Water Safety Valve

  21. Water Level Indicator

  22. Pressure Gauge

  23. Feed Check Valve

  24. Steam Stop Valve

  25. Blow-off Cock

  26. Fusible Plug

  27. Boiler Accessories • Economiser • Air preheater • Super heater • Steam trap • Steam separator • Injector

  28. Economiser

  29. Air Preheater

  30. Superheater

  31. Injector

  32. Steam Separator

  33. Pressure Reducing Valve

  34. Performance of Boilers • Evaporation Rate: It is steam generation rate of boilers which may be expressed in terms of kg of steam per unit heating surface area or kg of steam per cubic metre of furnace volume or kg of steam per kg fuel burnt. • Equivalent Evaporation: It is equivalent of evaporation of 1 kg of water at 100°C to dry and saturated steam at 100°C, standard atmospheric pressure of 1.013 bar. Hence, the equivalent evaporation of 1 kg of water at 100°C needs 2,257 kJ. • Factor of Evaporation: It is ratio of heat absorbed by 1 kg of feed water under working conditions to latent heat of steam at atmospheric pressure.

  35. Boiler Efficiency: It is ratio of heat absorbed by water in boiler to heat supplied to boiler per unit time.

  36. Thank You.

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