Efficiency enhancement in a Rankine cycle power plant: Combined cycle                     approach

Murugan, R.; Subbarao, P.M.V.

doi:10.1243/09576509jpe613

Cited by 10 publications

(9 citation statements)

References 11 publications

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“…Currently operating nuclear power stations have efficiencies ranging from 33% to 37% 3 , and thus any commercially viable plant should maintain a net thermodynamic efficiency of at least 33%. Several studies have been dedicated to achieving even marginal increases in thermodynamic efficiencies 4,5,6,7,8 . This is because the thermodynamic efficiency of a cycle correlates directly to the economic competitiveness of the power-plant in which it is integrated.…”

Section: Power Conversion System Performancementioning

confidence: 99%

An optimized power conversion system concept of the integral, inherently-safe light water reactor

Memmott

Wilding

Petrović

2017

Annals of Nuclear Energy

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The integral, inherently safe light water reactor (I 2 S-LWR) has been developed to significantly enhance passive safety capabilities while maintaining cost competitiveness relative to the current light water reactor (LWR) fleet. The compact heat exchangers of the I 2 S-LWR preclude boiling of the secondary fluid, which decreases the probability of heat exchanger failure, but this requires the addition of a flash drum, which negatively affects the overall plant thermodynamic efficiency. A state of the art Rankine cycle is proposed for the I 2 S-LWR to increase the thermodynamic efficiency by utilizing a flash drum with optimized operational parameters. In presenting this option for power conversion in the I 2 S-LWR power plant, the key metric used in rating the performance is the overall net thermodynamic efficiency of the cycle. In evaluating the flash-Rankine cycle, three basic industrial concepts are evaluated, one without an intermediate pressure turbine, one with an intermediate turbine and one reheat stream, and one with an intermediate turbine and two reheat streams. For each configuration, a single-path multi-variable optimization is undertaken to maximize the thermal efficiency. The third configuration with an intermediate turbine and 2 reheat streams is the most effective concept, with an optimized efficiency of 35.7%.

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Section: Power Conversion System Performancementioning

confidence: 99%

An optimized power conversion system concept of the integral, inherently-safe light water reactor

Memmott

Wilding

Petrović

2017

Annals of Nuclear Energy

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“…Simple cavern storage of water under pressure at temperatures up to 360 • C appears more economical than the options that allow temperatures to rise to 500 • C. 'Bottoming cycles' with an ammonia-water mixture heated to 390 • C are being developed for use with steam topping cycles [88]. This is a similar temperature to the maximum required in this solar heating application, and there is clear scope for optimization.…”

Section: New Fluids and Cycles For Integration With Solar-heated Genementioning

confidence: 99%

Technologies for tomorrow's electric power generation

Lawn

2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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In order to glean some insight into the likely trends in the next 50 years of power generation, the major trends of the last 50 years are reviewed first of all. It is noted that not only were all the power generating systems in operation today being researched in the 1960s, but so were most of those now being discussed for the future. The major trends in generation have all been driven by political and environmental considerations rather than by radically new ideas.For the next 50 years, in a new environment of concern about climate change and security of electricity supply, new technology must be developed to make some more of the options economically viable. This article surveys most of the systems now being considered and picks out a few of the enabling technologies. With such a broad subject, selectivity in the choice of sources is inevitable: this review draws preferentially upon papers published in the Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy over the last 10 years.

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“…A new combined cycle concept is proposed in the study [23], in an effort to improve the thermal power plant cycle efficiency by reducing the energy loss in the plant components. The proposed combined cycle plant uses water as a working fluid in the topping cycle and an ammonia-water mixture in the bottoming cycle and, according to the study, it is 4% more efficient than the standalone Rankine cycle operating on a condensing mode.…”

Section: Introductionmentioning

confidence: 99%

Exergy efficiency analysis of lignite-fired steam generator

2018

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The operation of steam generators and thermal power plants is commonly evaluated on a basis of energy analysis. However, the real useful energy loss cannot be completely justified only by the First law of thermodynamics, since it does not differentiate between the quality and amount of energy. The present work aims to give a contribution towards identification of the sources and magnitude of thermodynamic inefficiencies in utility steam generators. The work deals with a parallel analysis of the energy and exergy balances of a coal-fired steam generator that belongs to a 315 MWe power generation unit. The steam generator is designed for operation on low grade coal-lignite with net calorific value 6280 to 9211 kJ/kg, in a cycle at 545 °C/177.4 bar, with feed water temperature 251 °C, combustion air preheated to 272 °C and outlet flue gas temperature 160 °C. Since the largest exergy dissipation in the thermal power plant cycle occurs in the steam generator, energy, and exergy balances of the furnace and heat exchanging surfaces are established in order to identify the main sources of inefficiency. On a basis of the analysis, optimization of the combustion and heat transfer processes can be achieved through a set of measures, including retrofitting option of lignite predrying with flue gas and air preheating with dryer exhaust gases.

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Efficiency enhancement in a Rankine cycle power plant: Combined cycle approach

Cited by 10 publications

References 11 publications

An optimized power conversion system concept of the integral, inherently-safe light water reactor

An optimized power conversion system concept of the integral, inherently-safe light water reactor

Technologies for tomorrow's electric power generation

Exergy efficiency analysis of lignite-fired steam generator

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