3-D Numerical Analysis of The Effect of Flue Gas Injection into Natural Draft Dry Cooling Towers (Heller Type

In steam power plants, any improvement in the cooling towers thermal performance will cause the condenser's temperature to decrease which is then enhances the power plant'sefficiency. Environmental conditions strictly affect Heller cooling tower's performance. Temperature, density and the mass flow rate of sucked air intothe cooling tower will completely influence on its operation. To improve the cooling tower's operation it isproposed to inject the steam generator’s flue gasinto the tower for better air suction. In this study a natural draft dry cooling tower incorporating the flue gas duct is modeled to studythe effect of flue gas injection on the sucked air flow rate and the radiator heat transfer. Results show that the flue gas injection willhelp to improve the performance of the cooling tower; however at this case (natural draft cooling) this efficiency enhancement is not significant. Themaximum extra heat exchanged in the radiators due to flue gas injection is about 1.5 MW that canattain only 0.07oC water temperature decrease. However, this amount is so low to explain.

Keywords:

Natural Draft Dry Cooling Tower , Flue Gas Injection , Thermal Performance , Computational Fluid Dynamic