Impact of the cold end operating conditions on energy efficiency of the steam power plants

Laković, Mirjana; Stojiljković, Mladen M.; Laković, Slobodan V.; Stefanović, Velimir; Mitrović, Darko

doi:10.2298/tsci100415066l

Cited by 28 publications

(26 citation statements)

References 4 publications

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“…For the simulation of the power plant cold end operation, the simulation model developed by authors and described in [3,14,15] was applied. This model provided modular structure so that a plant model could be quickly adapted to represent various power plant configurations.…”

Section: The Thermodynamic Model Of Reference Of the Chosen Power Plantmentioning

confidence: 99%

“…This means that cooling water temperature is changing with weather conditions in particular region, and cannot be changed in order to achieve better condenser performances (i. e. higher vacuum in the condenser) [3]. For the steam power plant with once-through cooling system, cooling water temperature is determined by natural water source (i. e. river) temperature.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the evaporative towers cooling system of a coal-fired power plant

Laković

Banjac

2012

THERM SCI

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The paper presents a theoretical analysis of the cooling system of a 110 MW coal-fired power plant located in central Serbia, where eight evaporative towers cool down the plant. An updated research on the evaporative tower cooling system has been carried out to show the theoretical analysis of the tower heat and mass balance, taking into account the sensible and latent heat exchanged during the processes which occur inside these towers. Power plants which are using wet cooling towers for cooling condenser cooling water have higher design temperature of cooling water, thus the designed condensing pressure is higher compared to plants with a once-through cooling system. Daily and seasonal changes further deteriorate energy efficiency of these plants, so it can be concluded that these plants have up to 5% less efficiency compared to systems with once-through cooling. The whole analysis permitted to evaluate the optimal conditions, as far as the operation of the towers is concerned, and to suggest an improvement of the plant. Since plant energy efficiency improvement has become a quite common issue today, the evaluation of the cooling system operation was conducted under the hypothesis of an increase in the plant overall energy efficiency due to low cost improvement in cooling tower system

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Section: The Thermodynamic Model Of Reference Of the Chosen Power Plantmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the evaporative towers cooling system of a coal-fired power plant

Laković

Banjac

2012

THERM SCI

Self Cite

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“…As the temperature increases, the energy efficiency and output power of steam power plants decrease [14]. As the temperature increases, the energy efficiency and output power of steam power plants decrease [14].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous effects of water spray and crosswind on performance of natural draft dry cooling tower

2013

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To investigate the effect of water spray and crosswind on the effectiveness of the natural draft dry cooling tower (NDDCT), a three-dimensional model has been developed. Efficiency of NDDCT is improved by water spray system at the cooling tower entrance for high ambient temperature condition with and without crosswind. The natural and forced heat convection flow inside and around the NDDCT is simulated numerically by solving the full Navier-Stokes equations in both air and water droplet phases. Comparison of the numerical results with one-dimensional analytical model and the experimental data illustrates a well-predicted heat transfer rate in the cooling tower. Applying water spray system on the cooling tower radiators enhances the cooling tower efficiency at both no wind and windy conditions. For all values of water spraying rate, NDDCTs operate most effectively at the crosswind velocity of 3m/s and as the wind speed continues to rise to more than 3 m/s up to 12 m/s, the tower efficiency will decrease by approximately 18%, based on no-wind condition. The heat transfer rate of radiator at wind velocity 10 m/s is 11.5% lower than that of the no wind condition. This value is 7.5% for water spray rate of 50kg/s

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“…Northeastern US) despite an increase in precipitation [21]. Combined low flow and rising temperatures will result in a warming of rivers that simultaneously raises cooling water temperatures, lowers power plant efficiencies and increases threats to aquatic habitat [10,[22][23][24][25]. Recent regional and global-scale studies, such as van Vliet et al [26] and Rübbelke and Vögele [27], have highlighted the vulnerability of the thermoelectric sector to a warming climate [26,27].…”

Section: Strategic Planning Issues: Co-balancing Energy and Environmentmentioning

confidence: 99%

Riverine ecosystem services and the thermoelectric sector: strategic issues facing the Northeastern United States

Miara

Vörösmarty

Stewart

et al. 2013

Environ. Res. Lett.

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Major strategic issues facing the global thermoelectric sector include environmental regulation, climate change and increasing electricity demand. We have addressed such issues by modeling thermoelectric generation in the Northeastern United States that is reliant on cooling under five sensitivity tests to evaluate losses/gains in power production, thermal pollution and suitable aquatic habitat, comparing the contemporary baseline (2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010) with potential future states. Integral to the analysis, we developed a methodology to quantify river water availability for cooling, which we define as an ecosystem service.Projected climate conditions reduce river water available for efficient power plant operations and the river's capacity to absorb waste heat, causing a loss of regional thermoelectric generation (RTG) (2.5%) in some summers that, compared to the contemporary baseline, is equal to the summertime electricity consumption of 1.3 million Northeastern US homes. Vulnerabilities to warm temperatures and thermal pollution can be alleviated through the use of more efficient natural gas (NG) power plants that have a reduced reliance on cooling water. Conversion of once-through (OT) to cooling tower (CT) systems and the Clean Water Act (CWA) temperature limit regulation, both of which reduce efficiencies at the single plant level, show potential to yield beneficial increases in RTG. This is achieved by obviating the need for large volumes of river water, thereby reducing plant-to-plant interferences through lowering the impact of upstream thermal pollution and preserving a minimum standard of cooling water. The results and methodology framework presented here, which can be extrapolated to other regional assessments with contrasting climates and thermoelectric profiles, can identify opportunities and support decision-making to achieve more efficient energy systems and riverine ecosystem protection.

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Impact of the cold end operating conditions on energy efficiency of the steam power plants

Cited by 28 publications

References 4 publications

Analysis of the evaporative towers cooling system of a coal-fired power plant

Analysis of the evaporative towers cooling system of a coal-fired power plant

Simultaneous effects of water spray and crosswind on performance of natural draft dry cooling tower

Riverine ecosystem services and the thermoelectric sector: strategic issues facing the Northeastern United States

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