Effect of Cooling Water Flow Path on the Flow and Heat Transfer in a 660 MW Power Plant Condenser
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摘要
The effect of the cooling water flow path on the flow and heat transfer in a double tube-pass condenser for a 660 MW power plant unit was numerically investigated based on a porous medium model. The results were used to analyze the streamline, velocity, air mass fraction and heat transfer coefficient distributions. The simulations indicate that the cooling water flow path is important in large condensers. For the original tube arrangement, the heat transfer with the lower-upper cooling water flow path is better than that with the upper-lower cooling water flow path. The reason is that the steam cannot flow into the internal of upper tube bundle and the air fractions are higher in the upper tube bundle with the upper-lower cooling water flow path. An improvement tube arrangement was developed for the upper-lower cooling water flow path which reduced the back pressure by 0.47 kPa compared to the original scheme. Thus, the results show that the tube arrangements should differ for different cooling water flow paths and the condenser heat transfer can be improved for the upper-lower cooling water flow path by modifying the tube arrangement.
The effect of the cooling water flow path on the flow and heat transfer in a double tube-pass condenser for a 660 MW power plant unit was numerically investigated based on a porous medium model. The results were used to analyze the streamline, velocity, air mass fraction and heat transfer coefficient distributions. The simulations indicate that the cooling water flow path is important in large condensers. For the original tube arrangement, the heat transfer with the lower-upper cooling water flow path is better than that with the upper-lower cooling water flow path. The reason is that the steam cannot flow into the internal of upper tube bundle and the air fractions are higher in the upper tube bundle with the upper-lower cooling water flow path. An improvement tube arrangement was developed for the upper-lower cooling water flow path which reduced the back pressure by 0.47 kPa compared to the original scheme. Thus, the results show that the tube arrangements should differ for different cooling water flow paths and the condenser heat transfer can be improved for the upper-lower cooling water flow path by modifying the tube arrangement.
The effect of the cooling water flow path on the flow and heat transfer in a double tube-pass condenser for a 660 MW power plant unit was numerically investigated based on a porous medium model. The results were used to analyze the streamline, velocity, air mass fraction and heat transfer coefficient distributions. The simulations indicate that the cooling water flow path is important in large condensers. For the original tube arrangement, the heat transfer with the lower-upper cooling water flow path is better than that with the upper-lower cooling water flow path. The reason is that the steam cannot flow into the internal of upper tube bundle and the air fractions are higher in the upper tube bundle with the upper-lower cooling water flow path. An improvement tube arrangement was developed for the upper-lower cooling water flow path which reduced the back pressure by 0.47 kPa compared to the original scheme. Thus, the results show that the tube arrangements should differ for different cooling water flow paths and the condenser heat transfer can be improved for the upper-lower cooling water flow path by modifying the tube arrangement.
引文
[1]Standards for Steam Surface Condensers,tenth ed.,Heat Exchange Institute,Inc.,Ohio,USA,2006.
[2]Patankar S.,Spalding D.,Heat Exchanger Design Theory Source Book,Scripta Book Co.,Washington,DC,1974,pp.155-176.
[3]Davidson B.J.,Rowe.M.,Simulation of power plant condenser performance by computational methods:an overview,Power Condenser Heat Transfer Technology1980,pp.17-49.
[4]Bush A.W.,Marshall G.S.,Wilkinson T.S.,The prediction of steam condensation using a three component solution algorithm,in:Proceedings of the Second International Symposium on Condensers and Condensation,University of Bath,UK,1990,pp.223-234.
[5]Zhang C.,Numerical modeling using a quasi-threedimensional procedure for large power plant condensers,Journal of Heat Transfer,1994,116(1):180-188.
[6]Zhang C.,Zhang Y.,Sensitivity analysis of heat transfer coefficient correlations on the predictions of steam surface condensers,Heat Transfer Engineering,1994,15(2):54-63.
[7]Mirzabeygi P.,Zhang C.,Turbulence modeling for the two-phase flow and heat transfer in condensers,International Journal of Heat and Mass Transfer,2015,89(1):229-241.
[8]Hu H.G.,Zhang C.,A modified k-εturbulence model for the simulation of two-phase flow and heat transfer in condensers,International Journal of Heat and Mass Transfer,2007,50(9-10):1641-1648.
[9]Mirzabeygi P.,Zhang C.,Three-dimensional numerical model for the two-phase flow and heat transfer in condensers,International Journal of Heat and Mass Transfer,2015,81(1):618-637.
[10]Malin M.R.,Modelling flow in an experimental marine condenser,International Communications in Heat and Mass Transfer,1997,24(5):597-608.
[11]Bekdemir S.,?ztürk R.,Yumurtac Z.,Condenser optimization in steam power plant,Journal of Thermal Science,2003,12(2):176-178.
[12]Liu L.,Zhu T.,Gao N.,et al.,A review of modeling approaches and tools for the off-design simulation of organic rankine cycle,Journal of Thermal Science,2018,27(4):305-320.
[13]Li W.Z.,Wang W.C.,Wei Z.D.,A numerical analysis of the forced convection condensation of saturated vapor flowing axially outside a horizontal tube,Journal of Thermal Science 1995,4(1):31-37.
[14]Sato K.,Taniguchi A.,Kamada T.,et al.,New tube arrangement of condenser for power stations,JSMEInternational Journal Series.B:Fluids Thermal Engineering,1998,41(3):752-758.
[15]Roy R.P.,Ratisher M.,Gokhale V.K.,A computational model of a power plant steam condenser,Journal of Energy Resource Technology,2001,123(1):81-91.
[16]Ramón I.S.,González M.P.,Numerical study of the performance of a church window tube bundle condenser International Journal of Thermal Sciences,2001,40(2):195-204.
[17]Prieto M.M.,Suárez I.M.,Montanés E.,Analysis of the thermal performance of a church window steam condenser for different operational conditions using three models,Applied Thermal Engineering,2003,23(2):163-178.
[18]Zeng H.,Meng J.A.,Li Z.X.,Numerical study of a power plant condenser tube arrangement,Applied Thermal Engineering,2012,40(Supplement C):294-303.
[19]Zeng H.,Meng J.A.,Li Z.X.,Analysis of condenser shell side pressure drop based on the mechanical energy loss,Chinese Science Bulletin,2012,57(36):4718-4725.
[20]Meng J.A.,Zeng H.,Li Z.X.,Analysis of condenser venting rates based on the air mass entransy increases Chinese Science Bulletin,2014,59(26):3283-3291.
[21]Zhong D.W.,Zeng H.,Meng J.,Li Z.X.,Numerical simulation of power plant condenser performance and roles for tube arrangement,Journal of Engineering Thermophysics,2014,35(1):123-127.
[22]Meng J.A.,Li Z.X.,Entransy analysis of tube arrangement effect on condenser performances and its application(in Chinese).Chinese Science Bulletin,201661(17):1877-1888.
[2]Patankar S.,Spalding D.,Heat Exchanger Design Theory Source Book,Scripta Book Co.,Washington,DC,1974,pp.155-176.
[3]Davidson B.J.,Rowe.M.,Simulation of power plant condenser performance by computational methods:an overview,Power Condenser Heat Transfer Technology1980,pp.17-49.
[4]Bush A.W.,Marshall G.S.,Wilkinson T.S.,The prediction of steam condensation using a three component solution algorithm,in:Proceedings of the Second International Symposium on Condensers and Condensation,University of Bath,UK,1990,pp.223-234.
[5]Zhang C.,Numerical modeling using a quasi-threedimensional procedure for large power plant condensers,Journal of Heat Transfer,1994,116(1):180-188.
[6]Zhang C.,Zhang Y.,Sensitivity analysis of heat transfer coefficient correlations on the predictions of steam surface condensers,Heat Transfer Engineering,1994,15(2):54-63.
[7]Mirzabeygi P.,Zhang C.,Turbulence modeling for the two-phase flow and heat transfer in condensers,International Journal of Heat and Mass Transfer,2015,89(1):229-241.
[8]Hu H.G.,Zhang C.,A modified k-εturbulence model for the simulation of two-phase flow and heat transfer in condensers,International Journal of Heat and Mass Transfer,2007,50(9-10):1641-1648.
[9]Mirzabeygi P.,Zhang C.,Three-dimensional numerical model for the two-phase flow and heat transfer in condensers,International Journal of Heat and Mass Transfer,2015,81(1):618-637.
[10]Malin M.R.,Modelling flow in an experimental marine condenser,International Communications in Heat and Mass Transfer,1997,24(5):597-608.
[11]Bekdemir S.,?ztürk R.,Yumurtac Z.,Condenser optimization in steam power plant,Journal of Thermal Science,2003,12(2):176-178.
[12]Liu L.,Zhu T.,Gao N.,et al.,A review of modeling approaches and tools for the off-design simulation of organic rankine cycle,Journal of Thermal Science,2018,27(4):305-320.
[13]Li W.Z.,Wang W.C.,Wei Z.D.,A numerical analysis of the forced convection condensation of saturated vapor flowing axially outside a horizontal tube,Journal of Thermal Science 1995,4(1):31-37.
[14]Sato K.,Taniguchi A.,Kamada T.,et al.,New tube arrangement of condenser for power stations,JSMEInternational Journal Series.B:Fluids Thermal Engineering,1998,41(3):752-758.
[15]Roy R.P.,Ratisher M.,Gokhale V.K.,A computational model of a power plant steam condenser,Journal of Energy Resource Technology,2001,123(1):81-91.
[16]Ramón I.S.,González M.P.,Numerical study of the performance of a church window tube bundle condenser International Journal of Thermal Sciences,2001,40(2):195-204.
[17]Prieto M.M.,Suárez I.M.,Montanés E.,Analysis of the thermal performance of a church window steam condenser for different operational conditions using three models,Applied Thermal Engineering,2003,23(2):163-178.
[18]Zeng H.,Meng J.A.,Li Z.X.,Numerical study of a power plant condenser tube arrangement,Applied Thermal Engineering,2012,40(Supplement C):294-303.
[19]Zeng H.,Meng J.A.,Li Z.X.,Analysis of condenser shell side pressure drop based on the mechanical energy loss,Chinese Science Bulletin,2012,57(36):4718-4725.
[20]Meng J.A.,Zeng H.,Li Z.X.,Analysis of condenser venting rates based on the air mass entransy increases Chinese Science Bulletin,2014,59(26):3283-3291.
[21]Zhong D.W.,Zeng H.,Meng J.,Li Z.X.,Numerical simulation of power plant condenser performance and roles for tube arrangement,Journal of Engineering Thermophysics,2014,35(1):123-127.
[22]Meng J.A.,Li Z.X.,Entransy analysis of tube arrangement effect on condenser performances and its application(in Chinese).Chinese Science Bulletin,201661(17):1877-1888.