Advertisement

Experimental Investigation on Spray Cooling Using Saline Water

  • Christo NelEmail author
  • Zhiqiang Guan
  • Yuanshen Lu
  • Kamel Hooman
Special Issue
  • 10 Downloads

Abstract

Natural draft dry cooling towers (NDDCTs) are a type of cooling technology used in thermal power plants, including geothermal power plants. Interest from industry in this technology is increasing due to its water saving potential. However, the cooling performance of NDDCTs is inherently negatively impacted by high ambient temperatures. Among all existing solutions to this issue, inlet airflow precooling using water sprays is thought to be a good method to reduce the impact of high ambient temperature on the performance of NDDCTs. In previous studies, spraying of saline water obtained from water sources such as coal seam gas wells (as a by-product) was shown not only to save valuable freshwater resources but also to provide the further possibility of increasing the evaporation rate of water droplets, thereby shortening the wet length (distance) required for the spraying system. However, this benefit has not been verified. To address this knowledge gap, three different water sources were experimentally examined in the current study, viz. fresh, artificial simulated saline water, and real coal seam gas well water. Spraying using these three types of water was compared based on tests in a wind tunnel using a specific type of nozzle. The results confirmed an increase in the cooling efficiency of the spraying system when saline water was selected as the water source. However, the cooling efficiency may be more influenced by the nozzle orientation with respect to the airflow. On the other hand, spraying of saline water resulted in considerable deposition of solid particles from the water droplets in the airflow at 4.5 m downstream of the nozzle after only 2 h of spraying, although no significant nozzle clogging was observed even after the total of 50 h of testing. This effect could potentially cause fouling and corrosion on heat exchanger surfaces.

Keywords

Spray cooling Saline water spray Natural draft dry cooling tower Heat transfer 

Notes

Acknowledgements

This research was performed as part of the Australian Solar Thermal Research Initiative (ASTRI), a project supported by the Australian Government through the Australian Renewable Energy Agency (ARENA). The first author would also like to thank the Australian Government Research Training Program Scholarship.

References

  1. (2015) Industrial hydraulic spray products catalog 75a hyd. Wheaton, IL 60187-7901 USAGoogle Scholar
  2. ASHRAE (2013) 2013 ASHRAE handbook: fundamentals. Atlanta, GA: ASHRAE, SI edition, ISBN 1936504464Google Scholar
  3. Chaker M, Meher-Homji CB, Mee T (2004) Inlet fogging of gas turbine engines-part ii: fog droplet sizing analysis, nozzle types, measurement, and testing. J Eng Gas Turbines Power 126(3):559CrossRefGoogle Scholar
  4. Duniam S, Gurgenci H (2016) Annual performance variation of an EGS power plant using an ORC with NDDCT cooling. Appl Therm Eng 105:1021–1029CrossRefGoogle Scholar
  5. He S, Guan Z, Gurgenci H, Hooman K, Lu Y, Alkhedhair AM (2014) Experimental study of film media used for evaporative pre-cooling of air. Energy Convers Manag 87:874–884CrossRefGoogle Scholar
  6. He S, Gurgenci H, Guan Z, Hooman K, Zou Z, Sun F (2016) Comparative study on the performance of natural draft dry, pre-cooled and wet cooling towers. Appl Therm Engineering 99:103–113CrossRefGoogle Scholar
  7. Kinnon ECP, Golding SD, Boreham CJ, Baublys KA, Esterle JS (2010) Stable isotope and water quality analysis of coal bed methane production waters and gases from the Bowen Basin, Australia. Int J Coal Geol 82(3–4):219–231CrossRefGoogle Scholar
  8. Kröger DG (2004) Air-cooled heat exchangers and cooling towers/by Detlev G. Krger. Pennwell Corp, TulsaGoogle Scholar
  9. Li X, Guan Z, Gurgenci H, Lu Y, He S (2016) Simulation of the UQ Gatton natural draft dry cooling tower. Appl Therm Eng 105:1013–1020CrossRefGoogle Scholar
  10. Liu L, Li Y, Wang F (2012) Corrosion behavior of metals or alloys with a solid nacl deposit in wet oxygen at medium temperature. Sci China Technol Sci 55(2):369–376CrossRefGoogle Scholar
  11. Lu Y, Guan Z, Gurgenci H, Zou Z (2013) Windbreak walls reverse the negative effect of crosswind in short natural draft dry cooling towers into a performance enhancement. Int J Heat Mass Transf 63:162–170CrossRefGoogle Scholar
  12. Lu Y, Guan Z, Gurgenci H, Alkhedhair A, He S (2016) Experimental investigation into the positive effects of a tri-blade-like windbreak wall on small size natural draft dry cooling towers. Appl Therm Eng 105:1000–1012CrossRefGoogle Scholar
  13. Rudolph V, An H, Underschultz J (2017) Salt compression and recrystallisation. Technical report, University of QueenslandGoogle Scholar
  14. Sadafi H (2016) On the usage of saline water in spray assisted natural draft dry cooling towers. Ph.D. thesis, University of QueenslandGoogle Scholar
  15. Sadafi MH, Jahn I, Hooman K (2015a) Cooling performance of solid containing water for spray assisted dry cooling towers. Energy Convers Manag 91:158–167CrossRefGoogle Scholar
  16. Sadafi MH, Jahn I, Stilgoe AB, Hooman K (2015b) A theoretical model with experimental verification for heat and mass transfer of saline water droplets. Int J Heat Mass Transf 81:1–9CrossRefGoogle Scholar
  17. Sadafi MH, Gonzlez Ruiz S, Vetrano MR, Jahn I, van Beeck J, Buchlin JM, Hooman K (2016) An investigation on spray cooling using saline water with experimental verification. Energy Convers Manag 108:336–347CrossRefGoogle Scholar

Copyright information

© International Association for Mathematical Geosciences 2019

Authors and Affiliations

  1. 1.School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneAustralia
  2. 2.School of Engineering and Built EnvironmentGriffith UniversityBrisbaneAustralia

Personalised recommendations