THE APPLICATION OF A STEP BY STEP TECHNIQUE FOR THE PERFORMANCE PREDICTION OF THERMAL POWER PLANT SURFACE CONDENSERS
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Abstract
In the present work, the step by step technique is used to predict the performance of the power plant condenser. The procedure includes the calculation of pressure distribution, condensation temperature, water inlet and outlet temperature, condensation load distribution and single phase heat transfer sub-cooling. A quasi two dimensions model is applied, one in the tube water direction and the other in the vapor direction. It is applied with different operating conditions of the condenser such as operating pressure, air percentage mixed with steam, cooling water temperature and fouling factor on tube side for summer and winter seasons.
The present model revealed that the fouling resistance has a great effect and plays the major part of the decline in the condenser performance. This is because it decreases the overall heat transfer coefficient and condensation rate. The performance of the condenser when the cooling water enters at the lower pass is better than the upper pass, due to the balance in the distribution of the heat transfer and the condensation rate between tube passes. The model is verified with field operating conditions of Southern Baghdad thermal power station. It has revealed that there is a good agreement between the field data and the present technique. The accuracy fell within (98) % and (89) % for the cooling water temperature prediction for summer and winter respectively, while it showed accuracy of (98) % and (99) % for the condensate exit temperature prediction for summer and winter respectively.
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Berman L.D. and Fuks S.N., (1958), "Mass Transfer in Condensers with Horizontal Tube When Steam Contains Air", Teploenergetika, vol.5, pp.66-74.
Berman L.D. and Tumanov YU.A., (1962), "Condensation Hear Transfer on a Vapor Flow over a Horizontal Tube", Teploenergetika, vol.10, pp.77-84.
Cengel Y.A., (1998), "Heat Transfer: A Practical Application", McGraw-Hill Book Company.
Chen M.M., (1961), "An Analytical Study of Laminar Film Condensation", Trans. of ASME Journal of Heat Transfer, pp.55.
Chisholm D., Provant T.F. and Mitchill D., (1965), "Digital Computation Methods for Evaluating Heat Flux in Condensers", Journal of Mechanical Engineering Science, vol.7, no.2, pp.177-184.
Collier G.J., (1972), "Convective Boiling and Condensation", McGraw-Hill Book Company.
Davidson B.J., (1987), "Condensers for Large Turbines", in Aerothermodynamics of Low Pressure Steam Turbines and Condensers, Eds. Moore, Mj., and Severing, C.h., pp.217-251, Hemisphere.
Fujii H. U. and Kurata C., (1972), "Laminar Filmwise Condensation on Flowing Vapor on Horizontal Cylinder", Int. J. Heat Mass Transfer, vol.15, pp.235-246.
Fujii T., (1981), "Vapor Shear and Condensate Inundation", in Power Condenser Heat Transfer Technology, Eds. By Marto B.J. and Nunn R.H., pp.193-223, Hemisphar.
Fujii T., (1983), "Condensation in Tube Banks", in Condensers: Theory and Practice, I. Chem. E. Symp. Series, no.75, pp.3-22, Pergamon Press., London.
Fuks S.N., (1957), "Heat Transfer with Condensation of Steam Flowing in a Horizontal Tube Bundle", Teploenergetika, vol.4, pp.35-39.
Grant I.D.R. and Osment B.D.J., (1968), "The Effect of Condensate Drainage on Condenser Performance", Nel Report, no.350.
Jacob M. , (1959), "Heat Transfer", v.1.
Karl J and Hein D., (1999), "Effect of Spontaneous Condensation Heat Transfer in the Presence of Non-Condensable Gases", Proceedings of the 5th ASME / JSME Joint Thermal Engineering Conference, California.
Koh J.C.Y., Sparrow E.M. and Hartnett J.P., (1961), "Two Phase Flow Boundary Layer in Film Condensation", International Journal of Heat Transfer and Mass Transfer, v.2, p.69.
Kreith F., and Boehm R.F., (1999), "Heat and Mass Transfer", Mechanical Engineering Handbook, Ed. Frank Kreith, Bocaraton: CRC Press LLC.
Kutateladze S.S., Gogonin I.I., Dorokhov A.R. and Sosunov V.I., (1979), "Film Condensation of Flowing Vapor on a Bundle of Plain Horizontal Tubes", Thermal Engineering, vol.26, pp.273-280.
Liang Q., Wang X. and Narain A., (2004), "Effect of Gravity, Shear and Surface Tension in Internal Condensing Flows: Results from Direct Computational Simulations", Transactions of the ASME, vol.126, pp.672-686.
Majeed, L. M., (2007)," Theoretical Study of the Effect of Operating Conditions on the Performance of a Power Plant Condenser", MSc. Thesis, Mechanical Engineering Department, College of Engineering, Al-Mustansiriya University.
Marto P.J., (1988), "Fundamentals of Condensation" in Two Phase Flow Heat Exchangers, Kakac S., Berges A.E. and Mayinger F., Kluwer Academic Publishers, pp.221-291.
McNeil D.A., (1999), "Pressure and Heat Transfer Distributions Around A Bundle of Plasma Treated Tubes Condensing Dropwise", Research Institution, Department of Mechanical and Chemical Engineering With EPSRC.
Owen R.G. and Lee W.C., (1983)," A Review of Some Recent Developments in Condensation Theory", in Condensers: Theory and Practice, Published by Inst. Chem. Eng. Symposium Series no. 75, pp. 261-293, 1983.
Patankar S.V. and Spalding D.B., (1974), "A Calculation Procedure for the Transient and Steady-State Behavior of Shell and Tube Heat Exchangers", in Heat Exchangers: Design and Theory Source Book, Eds. afgan N. and Schlunder E.V., pp.155-176, McGraw-Hill, New York.
Rose J.W., (1984), "Effect of Pressure Gradient in Forced Convection Film Condensation on Horizontal Tube", Int. J. Heat Mass Transfer, vol.27, pp.39-47.
Rose J.W., (1980), "Approximate Equations for Forced Convection Condensation in the Presence of Non-Condensing Gas on a Flat and Horizontal Tube", Int. J. Heat Mass Transfer, vol.23, pp.539-546.
Seungmin Oh, (2003)," Turbulent Heat and Mass Transfer in Vertical Condenser", Convective Heat and Mass Transfer, ME605, Project Report.
Shekriladze I. G. and Gomelauri V. I., (1966), "Theoretical Study of Laminar Film Condensation of Flowing Vapor", Int. J. of Heat and Mass Transfer, Vol. 9, pp. 581-591.
Short B.E. and Brown H.E., (1951), "Condensation of Vapors on Vertical Banks of Horizontal Tubes", Inst. Mech. Engrs. Proc. General Discussion Heat Transfer, pp.27-31.
Tarrad A.H. and Kamal H.M., (2004), "A Model for Prediction of Surface Condenser Performance in Thermal Power Plants", Journal of Eng. and Development, vol.8, no.3.
Thome J.R., (2004), "Engineering Data Book III", copy right by Wolverine Tube, Inc.
Wilson J.L., (1972), "The Design of Condensers by Digital Computers", Inst. Chem. Eng. Symposium Series, no.35.
Zhang C., (1994), "Numerical Modeling Using a Quasi-Tree Dimensional Procedure for Large Power Plant", Trans. of ASME Journal of Heat Transfer, v.116, p.841.