Techno-economic comparison of wet and dry cooling systems for combined cycle power plants in different climatic zones

Njoku, Ifeanyi Henry; Diemuodeke, Ogheneruona E.

doi:10.1016/j.enconman.2020.113610

Cited by 9 publications

(5 citation statements)

References 33 publications

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“…Dry- and hybrid-cooling facilities consume an average of 7.6 L (2 gallons) of water per MWh . Although dry-cooling systems offer a valuable solution for water-scarce regions, they have high capital costs − and high energy requirements. ,, Comparing NGCC facilities in California with dry and wet cooling, Maulbetsch and DiFilippo found that dry-cooling facilities increase installation costs by 22.1 million dollars ($M). Loew et al found that dry-cooling facilities in Texas increase capital costs by 23–143 $M.…”

Section: Review Of Water Withdrawals Water Use and Reuse And Zld Appr...mentioning

confidence: 99%

“…Loew et al found that dry-cooling facilities in Texas increase capital costs by 23–143 $M. And Njoku and Diemuodeke found that dry-cooling facilities in dry, hot regions of Nigeria increase annual operating and maintenance costs by 19–38%.…”

Section: Review Of Water Withdrawals Water Use and Reuse And Zld Appr...mentioning

confidence: 99%

“…Moreover, dry facilities become less efficient as ambient air temperatures increase because of increased condensing temperature. , At ambient air temperatures greater than 25 °C, one study (Hamanaka et al) showed that efficiency decreases even more because of decreased turbine efficiency in addition to increased condensing temperature. The efficiency of wet-cooling systems also decreases as ambient temperatures increase, but the efficiency of wet-cooling systems typically decreases at a lower rate than dry-cooling systems due to factors such as humidity …”

Section: Review Of Water Withdrawals Water Use and Reuse And Zld Appr...mentioning

confidence: 99%

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Zero Liquid Discharge and Water Reuse in Recirculating Cooling Towers at Power Facilities: Review and Case Study Analysis

et al. 2022

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Zero liquid discharge (ZLD) systems installed at power facilities with the primary purpose of meeting water discharge regulations have the added benefit of providing high quality effluent that can be reused in the facility. This paper provides a review of water use in power sector recirculating cooling towers and a baseline assessment of on-site water reuse at natural gas combined cycle (NGCC) power facilities. Two NGCC facilities with reverse-osmosis (RO) or brine-concentrator processes followed by evaporation ponds were selected as case studies; data from these facilities were used to quantify the water, energy, and cost implications of implementing conventional and emerging ZLD technologies. At one case study facility, model results show that implementation of ZLD would reduce water withdrawals by 18%, which is less than savings associated with implementation of dry cooling but comparable to current efforts to reduce water withdrawals by increasing cycles of concentration. Implementation of ZLD using high-recovery RO resulted in a doubling of the levelized cost of water (LCOW). LCOW increased more when a brine concentrator was used. For both case studies, the ZLD system using high-recovery RO required less than 0.1% of a facilitiy's annual electricity generation and the ZLD system using a brine concentrator process required less than 0.8%. Additionally, increasing the evaporation pond area to minimize required ZLD system recovery rates and reduce system electricity costs does not reduce the LCOW. Instead, the LCOW increases because less water is recovered and more water is lost to evaporation. However, if water availability decreases or water competition/cost increases, facilities may be incentivized to maximize water recovery from ZLD systems.

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Section: Review Of Water Withdrawals Water Use and Reuse And Zld Appr...mentioning

confidence: 99%

Section: Review Of Water Withdrawals Water Use and Reuse And Zld Appr...mentioning

confidence: 99%

Section: Review Of Water Withdrawals Water Use and Reuse And Zld Appr...mentioning

confidence: 99%

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Zero Liquid Discharge and Water Reuse in Recirculating Cooling Towers at Power Facilities: Review and Case Study Analysis

et al. 2022

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“…So, enhancement in convection coefficient is very important to make dry cooling more widespread. Much attention has been paid on this subject by many researchers up to now [1].…”

Section: Introductionmentioning

confidence: 99%

Enhancement in Rejected Heat from Heat Sinks Using High Flexible Winglets with Large Deformation and Low Blockage Effect

Nassab

2022

IJEE

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“…Nigeria is therefore, poised to increase electricity generation capacity in the short-term by expanding the existing hydropower plants and connecting steam turbines to the thermal plants, to convert the open gas-fired power plants to a combined cycle [13].The country currently operates two CCPPs, namely the Okpai/Kwale CCPP, and the Afam VI CCPP [14]. On the backdrop that the production of sufficient electric power is the key to sustainable national development, this paper focuses on presenting a concise techno-economic analysis of employing the Gas Turbine (GT)…”

Section: Introductionmentioning

confidence: 99%

Techno-economic analysis of combined cycle power plants for electricity generation in Nigeria

Bori¹,

Orah²,

Ayo³

2022

Nig. J. Tech.

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This paper presents a techno-economic approach to readily assess the profitability or otherwise of combined cycle power plants (CCPPs) for increased electricity production in Nigeria. As a case study for this analysis, a combined cycle gas turbine plant with 650MW installed capacity at Afam VI power station is used to evaluate the installation of a 1000MW and 1500MW CCPP economically. The results and analysis determined a Levelized cost of electricity of N41.57k/KWh and N34.09k/KWh for the 1500MW and 1000MW CCPP, respectively. It signifies an increase of 33.33% and 66.67% in the cost of electricity per kWh between the 1000MW and 1500MW plant capacities respectively, relative to the 650MW CCPP. Therefore, the low LCOE makes it economically viable to install the 1000MW CCPP for electricity production in the country. The paper also proposes upgrading existing gas-fired power plants in the country into combined cycle power plants for improved electricity supply.

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Techno-economic comparison of wet and dry cooling systems for combined cycle power plants in different climatic zones

Cited by 9 publications

References 33 publications

Zero Liquid Discharge and Water Reuse in Recirculating Cooling Towers at Power Facilities: Review and Case Study Analysis

Zero Liquid Discharge and Water Reuse in Recirculating Cooling Towers at Power Facilities: Review and Case Study Analysis

Enhancement in Rejected Heat from Heat Sinks Using High Flexible Winglets with Large Deformation and Low Blockage Effect

Techno-economic analysis of combined cycle power plants for electricity generation in Nigeria

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