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Steam-Water Circulation in Boilers

  • Prabir Basu
  • Cen Kefa
  • Louis Jestin
Part of the Mechanical Engineering Series book series (MES)

Abstract

Circulation refers here to the flow of water, steam, or their mixture around the steam—water circuit in a boiler. In early days of boilers, steam was generated in a large vessel. The vessel was heated from outside, which would create a convective current within the large body of water. This process did not pose any threat to the safety of the boiler. So a detailed knowledge of steam—water circulation or flow pattern was not important. Modern water tube boilers, on the other hand, are subjected to increasingly higher levels of heat flux, temperature, and pressure. So the designers can no longer ignore the process of circulation of water and steam in the boilers. Inadequate circulation of water would fail to remove heat from the tube surface at a sufficient rate, which may lead to increased tube wall temperature. The allowable stress of the metal reduces with increasing metal temperature. In an extreme case the tube may rupture. An adequate circulation of steam—water is also essential for proper separation of steam from water. Without a good circulation the quality of steam would suffer.

Keywords

Heat Flux Critical Heat Flux Natural Circulation Water Wall Evaporator Section 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Alad’yev, LG., Gorlov, L.D., Dodonov, L.D., and Fedynskiy, O. (1969) Heat transfer to boiling potassium in uniformply heated tubes. Heat Transfer Soviet Research I (4): 14–26.Google Scholar
  2. Butterworth, D. (1971) “A Model for Prediction Dryout in a Tube with a Circumferential Variation in Heat Flux.” AERE-M-2436, Harwell.Google Scholar
  3. CKTI (1965) Standard developed by Boiler Design Institute of former Soviet Union.Google Scholar
  4. Doroshuchuk, V.E., Levitan, L.L., and Lantsmann, F.P. (1975) Recommendations for calculating burnout in round tube with uniform heat release. Teploenergetika 2(12): 66–70.Google Scholar
  5. Jens, W.H., and Lottes, P.A. (1951) Analysis of heat transfer, burnout, pressure drop and density data for high pressure water. Argonne National Laboratory Report ANL-4627.CrossRefGoogle Scholar
  6. Kefer, V. (1989) Stromungsformen and Warmeubergang in Verdampferrohren Unterschiedlicher Neigung. Dissertation, Technical University of Munich.Google Scholar
  7. Kon’kov, A.S. (1965) Experimental study of the conditions under which heat exchange deteriorates when a steam—water mixture flows in heated tubes. Teploenergetika 13(12): 77.Google Scholar
  8. Perkov, V.I. (1965) “Design of boilers.” Course notes on lectures delivered at the Mechanical Engineering Department of Indian Institute of Technology, Kharagpur.Google Scholar
  9. VDI Heat Atlas (1993) Verein Deutscher Ingeieur, ed. J.W. Fullarton, trans. Dusseldorf ISBN 3–18–400915–7, pp. Hbc 1–29.Google Scholar

Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • Prabir Basu
    • 1
  • Cen Kefa
    • 2
  • Louis Jestin
    • 3
  1. 1.Department of Mechanical EngineeringTechnical University of Nova ScotiaHalifaxCanada
  2. 2.Institute of Thermal EngineeringZhejiang UniversityHangzhou, ZhejiangChina
  3. 3.Department EquipmentElectricite de FranceVilleurbanneFrance

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