Investigating the effect of duct burner fuel mass flow rate on exergy destruction of a real combined cycle power plant components based on advanced exergy analysis

Boyaghchi, Fateme Ahmadi; Molaie, Hanieh

doi:10.1016/j.enconman.2015.07.008

Cited by 31 publications

(17 citation statements)

References 23 publications

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“…They also calculated the total avoidable exergy destruction which was about 27.16% and that the maximum exergy destruction rate which can be improved belongs to combustion chamber including 34.8% of total avoidable exergy destruction rate. Similar results were obtained by another study [25] of the same authors who applied the endogenous/exogenous exergy theory to the same system layout. They found that the avoidable exergy destruction is greater than the unavoidable one and that the potential improvement of the exergy destruction is just 27.16% of the total exergy destruction.…”

Section: Introductionsupporting

confidence: 86%

Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Calise

Libertini

Vicidomini

2016

Entropy

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This paper presents a detailed exergetic analysis of a novel high-temperature Solar Assisted Combined Cycle (SACC) power plant. The system includes a solar field consisting of innovative high-temperature flat plate evacuated solar thermal collectors, a double stage LiBr-H 2 O absorption chiller, pumps, heat exchangers, storage tanks, mixers, diverters, controllers and a simple single-pressure Combined Cycle (CC) power plant. Here, a high temperature solar cooling system is coupled with a conventional combined cycle, in order to pre-cool gas turbine inlet air in order to enhance system efficiency and electrical capacity. In this paper, the system is analyzed from an exergetic point of view, on the basis of an energy-economic model presented in a recent work, where the obtained main results show that SACC exhibits a higher electrical production and efficiency with respect to the conventional CC. The system performance is evaluated by a dynamic simulation, where detailed simulation models are implemented for all the components included in the system. In addition, for all the components and for the system as whole, energy and exergy balances are implemented in order to calculate the magnitude of the irreversibilities within the system. In fact, exergy analysis is used in order to assess: exergy destructions and exergetic efficiencies. Such parameters are used in order to evaluate the magnitude of the irreversibilities in the system and to identify the sources of such irreversibilities. Exergetic efficiencies and exergy destructions are dynamically calculated for the 1-year operation of the system. Similarly, exergetic results are also integrated on weekly and yearly bases in order to evaluate the corresponding irreversibilities. The results showed that the components of the Joule cycle (combustor, turbine and compressor) are the major sources of irreversibilities. System overall exergetic efficiency was around 48%. Average weekly solar collector exergetic efficiency ranged from 6.5% to 14.5%, significantly increasing during the summer season. Conversely, absorption chiller exergy efficiency varies from 7.7% to 20.2%, being higher during the winter season. Combustor exergy efficiency is stably close to 68%, whereas the exergy efficiencies of the remaining components are higher than 80%.

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Section: Introductionsupporting

confidence: 86%

Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Calise

Libertini

Vicidomini

2016

Entropy

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“…Table 7. Actual and unavoidable operating conditions for each component [37,38]. Taking into account the values of the operational conditions indicated in Table 7, the equations described in Section 2.3 were developed where the exergy destroyed is divided into endogenous/exogenous, avoidable/inevitable of each component for each fluid, except the capacitor that functions as a heat sink.…”

Section: Evaporatormentioning

confidence: 99%

Economic and Exergo-Advance Analysis of a Waste Heat Recovery System Based on Regenerative Organic Rankine Cycle under Organic Fluids with Low Global Warming Potential

2020

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The waste heat recovery system (WHRS) is a good alternative to provide a solution to the waste energy emanated in the exhaust gases of the internal combustion engine (ICE). Therefore, it is useful to carry out research to improve the thermal efficiency of the ICE through a WHRS based on the organic Rankine cycle (ORC), since this type of system takes advantage of the heat of the exhaust gases to generate electrical energy. The organic working fluid selection was developed according to environmental criteria, operational parameters, thermodynamic conditions of the gas engine, and investment costs. An economic analysis is presented for the systems operating with three selected working fluids: toluene, acetone, and heptane, considering the main costs involved in the design and operation of the thermal system. Furthermore, an exergo-advanced study is presented on the WHRS based on ORC integrated to the ICE, which is a Jenbacher JMS 612 GS-N of 2 MW power fueled with natural gas. This advanced exergetic analysis allowed us to know the opportunities for improvement of the equipment and the increase in the thermodynamic performance of the ICE. The results show that when using acetone as the organic working fluid, there is a greater tendency of improvement of endogenous character in Pump 2 of around 80%. When using heptane it was manifested that for the turbine there are near to 77% opportunities for improvement, and the use of toluene in the turbine gave a rate of improvement of 70%. Finally, some case studies are presented to study the effect of condensation temperature, the pinch point temperature in the evaporator, and the pressure ratio on the direct, indirect, and fixed investment costs, where the higher investment costs were presented with the acetone, and lower costs when using the toluene as working fluid.

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“…According to the reactions expressed as Eqs. (4)- (6), the sum of the reaction heat is +325 kJ mol -1 , reflecting the endothermic nature of the combination of these reactions. A heat source providing energy input is therefore required to sustain these endothermic reforming reactions.…”

Section: Steam Methane Reformingmentioning

confidence: 99%

Comparison of Exergy Losses for Reformers Involved in Hydrogen and Synthesis Gas Production

Behroozsarand

Wood

2019

Chem Eng & Technol

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A user‐coded, customized methodology for exergy balance and analysis of chemical and thermal processes is developed with the Aspen HYSYS process simulator, to assess and explain exergy loss in steam methane reforming. Exergy analysis is presented for four configurations of primary and secondary reformers to produce synthesis gas: (1) an autothermal reformer (ATR) alone, (2) a top‐fired reformer (TFR) alone, (3) ATR‐TFR configured in parallel, and (4) ATR‐TFR configured in series. The same states and feed conditions, i.e., mass flow rate, temperature, pressure, and feed gas composition, are applied to the four reformer configurations considered, with the single ATR showing the lowest exergy loss of about 0.43 W kg−1 of dry productivity.

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Investigating the effect of duct burner fuel mass flow rate on exergy destruction of a real combined cycle power plant components based on advanced exergy analysis

Cited by 31 publications

References 23 publications

Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Economic and Exergo-Advance Analysis of a Waste Heat Recovery System Based on Regenerative Organic Rankine Cycle under Organic Fluids with Low Global Warming Potential

Comparison of Exergy Losses for Reformers Involved in Hydrogen and Synthesis Gas Production

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