A Study of Heller Cooling Towers and Increasing their Efficiency, Case Study: Shahid Mohammad Montazeri Power Plant

Authors

Abstract

Heller cooling towers have a wide range of applications, especially in the regions with water shortage. One possible method to improve the efficiency of these towers, at high ambient temperatures, can be the use of - fans in the towers to increase heat transfer rate. As a case study, the operational data have been used for Shahid Montazeri Power Plant (Isfahan, Iran). Tower simulations with and without suction fans were developed through using CFD commercial code, Fluent. Cooling towers were simulated at different ambient temperatures, and the effects of fan power were studied numerically. A gPROMS code was developed as well to find out the effects of the installation of fans on the performance and parameters of the power plant. The results indicated that, at ambient temperature of 315 K, there was an increase of 7 MW per turbine or a total power increase of 56 MW in power production. An economic analysis of the plant, based on simple payback time method, predicts a total investment of 660,000 MRls and a payback time of 1.2 year up to 13.5 years, depending on the purchased price of the electricity. Based on the purchased price of 8000 Rls/kWh for the year 2017, a payback time of 1.4 years is calculated.

Keywords


[1] Yang, W. "Spray Cooling of Air-cooled" International Journal of Heat and mass transfer, Vol. 18, No. 2, pp. 311–317, 1975. [2] Wataru, N., Heikichi, K., Shigeki, H. "Heat Ttransfer from Tube Banks to Air/Water Mist Flow" International Journal of Heat and mass transfer, Vol. 31, No. 2, pp. 449–460, 1988. [3] Walczyk, H. "Enhancement of Heat Transfer from Air-Fin Coolers with Water Spray" Chemical Engineering and Processing, Vol. 32, No. 2, pp. 131–138, 1993. [4] Hasan, A., Siren, K. "Performance Investigation of Plain Circular and Oval Tube Evaporatively Cooled Heat Exchangers" Applied Thermal Engineering, Vol. 24, No. 5–6, pp. 777–790, 2004. [5] Chen, R.-H., Chow, L. C., and Navedo, J. E. "Optimal Spray Characteristics in Water Spray Cooling" International Journal of Heat and mass transfer, Vol. 47, No. 23, pp. 5095–5099, 2004. [6] Gholami, E., Ahmadi Kia, H. "Analytical Study Water Spray and Wind on the Efficiency of the Natural Dry Cooling Tower" The First Conference Power Plants, Qazvin, Iran Association of Electrical and Electronics Engineers, International University of Imam Khomeini, 2008. [7] Javadi, M., Golshani, A., Ghasemi, A. M., Anbarsooz, M. and Moghiman, M. "Improving Power Plant Efficiency Using Water Droplet Injection in Air Condensers" World Academy of Science, Engineering and Technology, Vol. 62, pp. 619–623, 2010. [8] Ahmadi Kia, H., Jalilzadeh, H. "Optimization Water to Increase the Efficiency of the Spray Drying Compulsion Fourth Natural Dry Cooling Tower" The Fourth Conference Power Plants, Tehran, Iranian Association of Electrical and Electronics Engineers, 2011. [9] Yuan, A., Jing, F., Ujun, L. L. "Parametric Study on Spray Cooling Systems in Natural Draft Dry Cooling Towers with a New Nozzle Representation Approach" in Proceedings of the 17th IAHR International Conference on Cooling Tower and Heat, Gold Coast, QLD, Australia, pp. 1–12, 2015. [10] Chen, L., Yang, L., Du, X. and Yang, Y. "Performance Improvement of Natural Draft Dry Cooling System by Interior and Exterior Windbreaker Configurations" International Journal of Heat and Mass Transfer, Vol. 96, pp. 42–63, 2016. [11] Yazdi, S., Gharehjanloo, S. "Proposition of Obliqueable Ring Installation at Crown of the Hellertype Cooling Tower for Reduction of Throttling Effect in Windy Condition" Modares Mechanical Engineering, Vol. 14, No. 3, pp. 185–193, 2014. [12] Mechanic, A., AhmadiKia, H., Soleimani, d. "The Effect of Variations in Ambient Temperature and Wind on the Performance of Natural Dry Cooling Heller Towers" Sixteenth Annual Conference of Mechanical Engineering, Kerman, Faculty of Engineering, Shahid Bahonar University, 2008. [13] Ghazanfar, A. "Optimization Heller Indirect Dry Cooling System" Third Energy and Environment Conference, Tehran, Kimiya Hamandishan Energy, 2013. [14] Bagheri, S. and Nikkhoo, M. "Investigation of the Optimum Location for Adding Two Extra Helertype Cooling Towers in Shazand Power Plant" in Proceedings of the 17th IAHR International Conference on Cooling Tower and Heat, Australia, pp. 74–83, 2015. [15] Yang, L. J., Chen, L., Du, X. Z., Yang, Y. P. "Effects of Ambient Winds on the Thermo-flow Performances of Indirect Dry Cooling System in a Power Plant" International Journal of Thermal Sciences, Vol. 64, pp. 178–187, 2013. [16] Jahangiri, A., Glnshan, A. "Assessment of Functional Heat Recovery Due to Injected the Exhaust into Heller Tower" The First National Conference Industry Thermal Power Plant, Tehran, Tehran University, 2009. [17] Scott, B. and Andrew, J. "Finance for Managers" pp. 212-213, 2015.