THE RESEARCH OF CIRCULATION WATER SUPPLY SYSTEM OF POWER UNIT OF THERMAL POWER PLANT WITH HELLER COOLING TOWER

1
Lviv Polytechnic National University, Department of hydraulics and plumbing
2
Lviv Polytechnic National University, Department of Hydraulic and Water Engineering
3
Lviv Polytechnic National University, Department of Hydraulic and Water Engineering
4
2Private Company “LVIVORGRES”

Analytical hydraulic researches of the circulating water cooling system of the power unit of a thermal power plant with Heller cooling tower have been performed. Analytical studies were performed on the basis of experimental data obtained during the start-up tests of the circulating water cooling system of the “Hrazdan-5” power unit with a capacity of 300 MW. Studies of the circulating water cooling system were carried out at an electric power of the power unit of 200 - 299 MW, with a thermal load of 320 - 396 Gcal/hr. By circulating pumps (CP), water mixed with condensate is fed to the cooling tower, from where it is returned through the turbine for spraying by nozzles in the turbine steam condenser. An attempt to increase the water supply to the condenser by increasing the size of the nozzles did not give the expected results. The amount of the water supply to the circulating pumping station depends on the pressure loss in the circulating water cooling system. The highest pressure losses are in hydro turbines (HT), which are part of the circulating pumping station. Therefore, by adjusting the load of the hydro turbine, with a decrease in water pressure losses, you can increase the water supply by circulating pumps to the condenser. Experimental data and theoretical dependences were used to calculate the changed hydraulic characteristics of the circulating water cooling system. As a result of reducing the pressure losses in the section of the hydro turbine from 1.04 to 0.15 kgf/cm2, the dictating point for the pressure of circulating pumping station will be the turbine steam condenser. The thermal power plant cooling tower is designed to service two power units. Activation of the peak cooler sectors of the cooling tower gives a reduction of the cooled water temperature by 2-4 °С only with the spraying system.

M. Deziani, .Kh. Rahmani, S. J. Mirrezaei Roudaki & M. Kordloo, M. (2017) Feasibility study for reduce water evaporative loss in a power plant cooling tower by using air to Air heat exchanger with auxiliary Fan.
https://doi.org/10.1016/j.desal.2015.12.007 Desalination Volume 40616, 119-124.

Ali Reza Seifi, Omid AliAkbari, Abdullah A.A.A.Alrashed, FazelAfshary, Gholamreza Ahmadi, Sheikh Shabani, Reza Seifi, Marjan Goodarzi, Farzad Pourfattah (2018) Effects of external wind breakers of Heller dry cooling system in power plants. Applied Thermal Engineering. Volume 129, Pages 1124-1134. https://doi.org/10.1016/j.applthermaleng.2017.10.118

Reza Alizadeh Kheneslu, Ali Jahangiri & Mohammad Ameri (2020) Interaction effects of natural draft dry cooling tower (NDDCT) performance and 4E (energy, exergy, economic and environmental) analysis of steam power plant under different climatic conditions. Sustainable Energy Technologies and AssessmentsVolume 37, 2020Article 100599. https://doi.org/10.1016/j.seta.2019.100599

Guangjun Yang, Li Ding, Tongqing Guo, Xiaoxiao Li Wenxin Tian, Zhen Xu, Zhigang Wang, Furong Sun, JunjieMin, Jingxin Xu, Sheng Wang, Zhaobing Guo. (2020) Study of flue gas emission and improvement measure in a natural draft dry-cooling tower with flue gas injection under unfavorable working conditions. Atmospheric Pollution Research. Volume 11, Issue 5, Pages 963-972. https://doi.org/10.1016/j.apr.2020.02.008

Peixin Dong, Xiaoxiao Li, Kamel Hooman, Yubiao Sun, & Hal Gurgenci. (2019) The crosswind effects on the start-up process of natural draft dry cooling towers in dispatchable power plants. International Journal of Heat and Mass Transfer Volume 135, Pages 950-961. https://doi.org/10.1016/j.ijheatmasstransfer.2019.02.039

Wenjing Ge, Yuanbin Zhao, Shiwei Song, Wendong Li, Shasha Gao, Tie Feng Chen. (2020) Thermal characteristics of dry cooling tower reconstructed from obsolete natural draft wet coolingtower and the relevant thermal system coupling optimization. Applied Thermal Engineering. Volume 174, 115202. https://doi.org/10.1016/j.applthermaleng.2020.115202

Z. Nourani, A. Naserbegi, Sh. Tayyebi & M. Aghaie. (2019) Thermodynamic evaluation of hybrid cooling towers based on ambient temperature. Thermal Science and Engineering ProgressVolume 14, Article 100406.https://doi.org/10.1016/j.tsep.2019.100406

A. Jahangiri, M. M. Yahyaabadi, & A. Sharif. (2019) Exergy and economic analysis of using the flue gas injection system of a combined cycle power plant into the Heller Tower to improve the power plant performance. Journal of Cleaner Production, Volume 2331, Pages 695-710. https://doi.org/10.1016/j.jclepro.2019.06.077 

Peixin Dong, Antonio S. Kaiser, Zhiqiang Guan, Xiaoxiao Li & Kamel Hooman. (2019) A novel method to predict the transient start-up time for natural draft dry cooling towers in dispatchable power plants. International Journal of Heat and Mass Transfer, Volume 145, Article 118794. https://doi.org/10.1016/j.ijheatmasstransfer.2019.118794

Xiaoxiao Li, Hal Gurgenci, Zhiqiang Guan, Xurong Wang & Sam Duniam. (2017) Measurements of crosswind influence on a natural draft dry cooling tower for a solar thermal power plant. Applied EnergyVolume
20615 Pages 1169-1183.

Xuehong Chen, Fengzhong Sun, Youliang Chen, MingGao. (2019) Novel method for improving the cooling performance of natural draft wet cooling towers. Applied Thermal Engineering. Volume 147, Pages 562-570.https://doi.org/10.1016/j.applthermaleng.2018.10.076

Zhigang Dang, Ming Gao, Guoqing Long, Jian Zou, Suoying He, Fengzhong Sun. (2019) Crosswind influence on cooling capacity in different zones for high level water collecting wet coolingtowers based on field test. Journal of Wind Engineering and Industrial Aerodynamics. Volume 190, Pages 134-142.https://doi.org/10.1016/j.jweia.2019.04.014

Peixin Dong, Xiaoxiao Li, Zhiqiang Guan, & Hal Gurgenci. (2018) The transient start-up process of natural draft dry cooling towers in dispatchable thermal power plants. International Journal of Heat and Mass Transfer Volume 123 Pages 201-212.https://doi.org/10.1016/j.ijheatmasstransfer.2018.02.114

Bosak M., Cherniuk V., Matlai I., Bihun I. (2019) Studying the mutual interaction of hydraulic characteristics of water distributing pipelines and their spraying devices in the coolers at energy units. Eastern-European Journal of Enterpricse Technologies. Volume 3/8 (99). Pages 23-29. https://doi.org/10.15587/1729-4061.2019.166309