Preventing exergy destruction in the cold end of a power plant [Elektronski vir]
Oman, Janez, 1947- ; Širok, Brane ; Smrekar, Jure
The objective of the paper is to present the analysis of experimental data on the transition phenomena of mass and heat transfer in the natural draft cooling tower connected with the condenser in the ...unit and the influence of both on the unitćs performance. The effectiveness of heat transfer in the cooling tower influences the saturation temperature in the condenser, which affects the load of the steam turbine and consequentially the efficiency of the unit. The analysis presented in the paper is based on the results of simultaneous measurements of the unitćs performances, the thermodynamic variables in the cooling tower and the parameters of the condenser. The results of measurements as well as the results of analysis are presented graphically. The reconstruction of the cooling tower was performed for itćs bad operational characteristics. After reconstruction, the measurements of cooling tower, condenser and performance tests of unit were repeated. The analysis was carried out from the point of view of operating characteristics of the unitćs cold end i.e. of the cooling tower and the condenser. The results indicated that after improvement of the cooling tower efficiency the bad operating conditions in the condenser exposed to view. After improvements of the cooling tower operational characteristics the efficiency of the unit aswhole was improved, but the calculations show that through condenser still more exergy is destroyed, therefore it is necessarily to improve the condenserćs performance.
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