Performance enhancement in coal fired thermal power plants. Part II: steam turbines

Bhatt, M. Siddhartha; Rajkumar, N.

doi:10.1002/(sici)1099-114x(199905)23:6<489::aid-er494>3.0.co;2-t

Cited by 19 publications

(17 citation statements)

References 2 publications

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“…In the literature, there exist a number of papers concerning energetic and exergetic performances of coal-fired thermal power plants [11][12][13][14][15][16][17][18][19][20]. For instance, Bhatt and Rajkumar [11] presented different ways of enhancing the performance of the coal-fired thermal power plants.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Bhatt and Rajkumar [11] presented different ways of enhancing the performance of the coal-fired thermal power plants. Aljundi [12] determined the location of the most energy and exergy losses for Al-Hussein thermal power plant in Jordan through the energy and exergy analyses and, investigated the effects of variation of the reference ambient conditions on exergetic performance.…”

Section: Introductionmentioning

confidence: 99%

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Comparative energetic and exergetic performance analyses for coal-fired thermal power plants in Turkey

Erdem

Akkaya

Çetin

et al. 2009

International Journal of Thermal Sciences

132

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative energetic and exergetic performance analyses for coal-fired thermal power plants in Turkey

Erdem

Akkaya

Çetin

et al. 2009

International Journal of Thermal Sciences

132

View full text Add to dashboard Cite

“…This value was shown by Bhatt and Rajkumar (1999) to be between 97.5% and 98.5% for a range of turbines examined with rated capacities between 30MWe and 500MWe [46].…”

Section: Generatormentioning

confidence: 90%

“…Bhatt and Kajkumar in [46] report that the average mechanical and adiabatic efficiency for turbines between 30MWe and 500MWe remains almost constant between 99% and 99.9%.…”

Section: Steam Turbine Efficiencymentioning

confidence: 99%

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Why do steam power plants have to be very large?

Venus¹

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AcknowledgementsThere are a few people who I would like to thank for assisting me throughout the completion of this thesis. Bachelor of Engineering Thesis iii AbstractWith a lack of investment and limited technological advances, CST power generation has been unable to benefit from industry expertise and consequently failed to appreciate potential cost reductions. Present cost estimates dictate that the minimum economical size for CST plantations is 50MWe. Coincidently, almost 90% of concentrating solar thermal electricity generation is produced by plantations operating with capacities in excess of 50MWe [1].Currently, Australian pre-existing energy markets are penetrable for smaller capacity CST designs with outputs ranging from 1MWe to 30MWe [2]. The aim of this study is to investigate the motives underpinning the lack of market drive and integration of downscaled CST power generation in Australia. Research underpinning this investigation focuses primarily on Parabolic Trough and SolarTower CST plant configurations due to the commercial maturity of each system. As a result, specific process efficiencies were investigated in order to establish prevalent loss mechanisms associated with capacity variations. Examination of the solar field components revealed distinct trends supporting downscaling, notably the collector efficiency of a heliostat field (Solar Tower configuration) shows likely improvement with smaller field size. However, the efficiency of integrated steam turbines was found to be largely dependent on the power block design capacity. Typical turbine efficiency can range between a low of 40% for small capacity, single-stage turbines to a high of up to 90% for large capacity, multi-stage, multivalve condensing turbine [3]. This led to the conclusion that the major contributor to the deterrence of downscaling CST electricity generation is the reduction in the operating efficiency of the power block with plant size. The impact of this is a relative size increase in the thermal energy input into the system in order to compensate for conversion losses. To achieve a greater thermal input, a larger relative solar field is required; this additional cost presents a less attractive investment option.Furthermore, a review of cost trends highlighted further economic constraints imposed by the economies of scale effect in determining relative plant costs. Identification of these key limitations on downscaling CST power generation may subsequently drive further increases into solar investment within Australia and promote sustainable energy production. Bachelor of Engineering Thesis iv

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One feedwater heater taken out of service as a strategy to maintain full load and its effect on steam power cycle parameters and performance

Riesgo

Folgueras

2019

Int J Energy Res

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Summary The aim of this study is to analyze the suitability of one heater removal as a strategy for maintaining full load operation of steam power cycles when superheated and/or reheated temperatures (TSS, TRS) decrease and the effect on the net heat rate (HRNet). For this purpose, three regenerative cycles with different numbers of closed feedwater heaters were chosen. The cycles were analyzed at different steady states with Thermoflex software. Removing a heater has an important influence on the cycle operation and performance, leading to the redistribution of extraction mass flows, with the heater immediately downstream being the most affected. This may make it necessary to reduce the load of the cycle. However, when the highest pressure heater (highest PH) is removed from service, the changes are not so significant. When TSS and/or TRS decrease, the plant may not achieve full load operation. Nevertheless, if the highest PH is removed from service, it can help to recover full load. This is due to the decrease in the water/steam mass flow through the steam generator, which produces an increase in TSS and/or TRS. On the one hand, this measure leads to higher HRNet in comparison to that of the nominal conditions. On the other hand, there are certain conditions at which HRNet is lower than when all the heaters are in service and the values of TSS and/or TRS are low. Thus, for maintaining full load, the highest PH removal can be applied and cycle parameters optimized in order to reach a HRNet closer to its nominal value. The higher the number of closed feedwater heaters, the more adequate is the application of this strategy.

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Performance enhancement in coal fired thermal power plants. Part II: steam turbines

Cited by 19 publications

References 2 publications

Comparative energetic and exergetic performance analyses for coal-fired thermal power plants in Turkey

Comparative energetic and exergetic performance analyses for coal-fired thermal power plants in Turkey

Why do steam power plants have to be very large?

One feedwater heater taken out of service as a strategy to maintain full load and its effect on steam power cycle parameters and performance

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