Thermoeconomic optimization of heat recovery steam generators operating parameters for combined plants

Casarosa, Claudio; Donatini, F.; Franco, Alessandro

doi:10.1016/s0360-5442(02)00078-6

Cited by 126 publications

(56 citation statements)

References 9 publications

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“…An exergy analysis was carried out by Habib and Al-Bagawi [4] for the Ghazlan power plant to specify the irreversibility in the system. Casarosa et al [5] have presented the optimization of HRSGs by using two or more water streams, exchanging with the exhaust gas stream. This method will decrease the exergy losses due to temperature difference between the hot and cold streams.…”

Section: Introductionmentioning

confidence: 99%

Exergy analysis of a 420 MW combined cycle power plant

Ameri¹,

Ahmadi²,

Khanmohammadi³

2008

Int. J. Energy Res.

223

106

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SUMMARYCombined cycle power plants (CCPPs) have an important role in power generation. The objective of this paper is to evaluate irreversibility of each part of Neka CCPP using the exergy analysis. The results show that the combustion chamber, gas turbine, duct burner and heat recovery steam generator (HRSG) are the main sources of irreversibility representing more than 83% of the overall exergy losses. The results show that the greatest exergy loss in the gas turbine occurs in the combustion chamber due to its high irreversibility. As the second major exergy loss is in HRSG, the optimization of HRSG has an important role in reducing the exergy loss of total combined cycle. In this case, LP-SH has the worst heat transfer process.The first law efficiency and the exergy efficiency of CCPP are calculated. Thermal and exergy efficiencies of Neka CCPP are 47 and 45.5% without duct burner, respectively. The results show that if the duct burner is added to HRSG, these efficiencies are reduced to 46 and 44%. Nevertheless, the results show that the CCPP output power increases by 7.38% when the duct burner is used.

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Section: Introductionmentioning

confidence: 99%

Exergy analysis of a 420 MW combined cycle power plant

Ameri¹,

Ahmadi²,

Khanmohammadi³

2008

Int. J. Energy Res.

223

106

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“…These correlations were originally derived for heat exchangers made of aluminum alloys; consequently, the material correction factors suggested by Towler and Sinnott [43] were applied to consider the different alloys employed. For the economizer, the correlation presented by Casarosa [44] was utilized for estimating its acquisition price. All cost estimates were updated to 2015 by means of the Chemical Engineering Plant Cost Index (CEPCI) [45].…”

Section: Nomenclature Symbolsmentioning

confidence: 99%

Design Point Performance and Optimization of Humid Air Turbine Power Plants

et al. 2017

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Abstract:With the recent drive towards higher thermal efficiencies and lower emission levels in the power generation market, advanced cycle power plants have become an increasingly appealing option. Among these systems, humid air turbines have been previously identified as promising candidates to deliver high efficiency and power output with notably low overall system volume, weight and emissions footprint. This paper investigates the performance of an advanced humid air turbine power cycle and aims to identify the dependencies between key cycle design variables, thermal performance, weight and cost by means of a parametric design optimization approach. Designs of the main heat exchangers are generated, aiming to ascertain the relationship between their technology level and the total weight and acquisition cost of them. The research outcomes show that the recuperator and the intercooler are the two components with the largest influence on the thermal efficiency and the total cost. The total weight of the power system is driven by the technology level of the recuperator and the economizer. Finally, the effectiveness of the aftercooler seems to have the greatest impact in reducing the total acquisition cost of the system with minimum penalty on its thermal efficiency.

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“…If the dryness fraction at the steam-turbine outlet is less than 80%, the steam expands to a higher pressure, at which the dryness fraction is exactly 80%. The dryness fraction [27] is a boundary condition imposed in the mathematical model. Such a penalty has proven to be very effective for obtaining optimal solutions because it avoids further constraints.…”

Section: Mathematical Modelmentioning

confidence: 99%

Novel method for determining optimal heat-exchanger layout for heat recovery steam generators

Čehil

Katulić

Schneider

2017

Energy Conversion and Management

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a b s t r a c tA new method for determining the optimal heat-exchanger layout in a heat recovery steam generator and its operating parameters are presented in this paper. A robust mathematical model is developed, where arbitrary steam-pressure levels and steam-reheating levels can be set. The method considers all the possible heat-exchanger layouts, in both serial and parallel arrangements of steam pressure levels or steam reheating levels. The maximum thermodynamic efficiency of the steam-turbine cycle is set as the objective function. The results show that the optimal high pressure in heat recovery steam generator without reheating is in the region of subcritical pressures, whereas that for a heat recovery steam generator with reheating is in the region of supercritical pressures. In the case of similar water or steam temperature profiles in the heat exchangers of different steam pressure levels or reheating level, from a thermodynamic viewpoint, it is justified to use a parallel heat-exchanger arrangement.

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Thermoeconomic optimization of heat recovery steam generators operating parameters for combined plants

Cited by 126 publications

References 9 publications

Exergy analysis of a 420 MW combined cycle power plant

Exergy analysis of a 420 MW combined cycle power plant

Design Point Performance and Optimization of Humid Air Turbine Power Plants

Novel method for determining optimal heat-exchanger layout for heat recovery steam generators

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