High efficiency cogeneration: CHP and non-CHP energy

Gvozdenac, Dušan D.; Urošević, Branka Gvozdenac; Menke, Christoph; Urošević, Dragan; Bangviwat, Athikom

doi:10.1016/j.energy.2017.06.143

Cited by 51 publications

(24 citation statements)

References 14 publications

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“…Much research has been conducted on improvement to the efficiency of power plants. This has led to proposals for new configurations and cycle architectures (Wu et al, 2012;Zhang and Zhang, 2013;Mcgrail et al, 2017), suggestions for improving the efficiency of the two-phase phenomena in power plants, such as boiling (Nie et al, 2017;Tian et al, 2017;Ahmadpour et al, 2018) and condensation (Yoo et al, 2018), as well as recommendations for improving the overall efficiency of plant through operation in cogeneration mode (Das and M. Al-Abdeli, 2017;Gvozdenaca et al, 2017;Moradi et al, 2017).…”

Section: Efforts To Improve Efficiencymentioning

confidence: 99%

Thermal Energy Processes in Direct Steam Generation Solar Systems: Boiling, Condensation and Energy Storage – A Review

et al. 2019

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Section: Efforts To Improve Efficiencymentioning

confidence: 99%

Thermal Energy Processes in Direct Steam Generation Solar Systems: Boiling, Condensation and Energy Storage – A Review

et al. 2019

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“…The calculation of the power loss coefficient and the definition of the reference efficiency are critical aspects of the implementation of the Directive, as verified by Gvozdenac et al [12]; they studied an actual 150 MW capacity CCGT plant of independent power producers (IPPs) in Thailand, and the investigation showed that the reference value of high-efficiency cogeneration has a large effect on the percentage of CHP electricity output. The impact of the power loss coefficient is not as large, but it influences CHP electricity and CHP fuel energy.…”

Section: Introductionmentioning

confidence: 95%

“…The impact of the power loss coefficient is not as large, but it influences CHP electricity and CHP fuel energy. These factors are crucial in determining a plant's profitability, so Gvozdenac et al [12] proposed a modified procedure for the assessment of a CHP plant's efficiency in line with the work of Urošević et al [13].…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Cogeneration Systems: The Case of the Paper Industry in Italy

et al. 2019

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In January 2011, the introduction of high-efficiency cogeneration in Europe radically modified the incentive scheme for combined heat and power (CHP) plants. Since then, the techno-economic feasibility of new cogeneration plants in different areas of application (industry, service, residential, etc.), along with the definition of their optimal operation, have inevitably undergone a radical change. In particular, with reference to the Italian case and according to the most recent ministerial guidelines following the new EU regulation, in the event that cogeneration power plants do not reach an established value in terms of overall efficiency, their operation has to be split into a CHP and a non-CHP portion with incentives proportional to the energy quantities pertaining to the CHP portion only. In the framework of high-efficiency cogeneration, the present study compares different CHP solutions to be coupled with the paper industry that, among all the industrial processes, appears to be the best suited for cogeneration applications. With reference to this particular industrial reality, energy, environmental, and economic performance parameters have been defined, analysed, and compared with the help of GateCycle software. Among the proposed CHP alternatives, results show that gas turbines are the most appropriate technology for paper industry processes.

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“…Furthermore, by recovering and using heat, cogeneration units can diminish environmental emissions in the generation sector by 13–18% [ 7 ], which has been recognized as playing a crucial role in energy sustainability and the attempt to achieve climate change response objectives [ 8 , 9 ]. Since cogeneration can alleviate the need for increased power generation capacity and reduce the environmental impact associated with energy consumption, it has been broadly utilized in different countries [ 10 , 11 , 12 ]. In China, the operational CHP capacity has been over 300 million kW since 2016, and 350 million kW of coal-fired power units will be retrofitted into cogeneration units for district heating before 2020 [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Economic Analyses of Reformative Design for High Back-Pressure Heating in Coal-Fueled Cogeneration Units

Chen

et al. 2019

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High back-pressure (HBP) heating technology has been identified as an effective approach to improve the efficiency of combined heat and power (CHP). In this study, the novel concept of a HBP heating system with energy cascade utilization is developed and its probability examined. In the reformative design, the extracted heating steam from the intermediate-pressure turbine (IPT) is first drawn to an additional turbine where its excess pressure can be converted into electricity, then steam with a lower pressure can be employed to heat the supply water. As a consequence, the exergy destruction in the supply water heating process can be reduced and the efficiency of the cogeneration unit raised. A detailed thermodynamic investigation was performed based on a typical coal-fired HBP–CHP unit incorporating the proposed configuration. The results show that the artificial thermal efficiency (ATE) promotion was as much as 2.01 percentage points, with an additional net power output of 8.4 MW compared to the reference unit. This was attributed to a 14.65 percentage-point increment in the exergy efficiency of the supply water heating process caused by the suggested retrofitting. The influences of the unit power output, unit heat output, supply water and return water temperatures and turbine back pressure on the thermal performance of the modified system are discussed as well. In addition, the economic performance of the new design is assessed, indicating that the proposed concept is financially feasible.

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High efficiency cogeneration: CHP and non-CHP energy

Cited by 51 publications

References 14 publications

Thermal Energy Processes in Direct Steam Generation Solar Systems: Boiling, Condensation and Energy Storage – A Review

Thermal Energy Processes in Direct Steam Generation Solar Systems: Boiling, Condensation and Energy Storage – A Review

High-Efficiency Cogeneration Systems: The Case of the Paper Industry in Italy

Thermodynamic and Economic Analyses of Reformative Design for High Back-Pressure Heating in Coal-Fueled Cogeneration Units

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