Exergy, economic and environmental impact assessment and optimization of a novel cogeneration system including a gas turbine, a supercritical CO2 and an organic Rankine cycle (GT-HRSG/SCO2)

Nami, Hossein; Mahmoudi, S.M.S.; Nemati, Arash

doi:10.1016/j.applthermaleng.2016.08.197

Cited by 229 publications

(24 citation statements)

References 56 publications

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“…In the supercritical state, the CO 2 presents a higher density which enables to downsize the equipment with respect to more conventional technologies as gas turbines or steam power plants [36]. The reduced size of the system components allows to reduce the investment and maintenance costs as well as the footprint of the system itself, which can be beneficial for WHR applications [37,38]. A further benefit derives from the fluid properties near the critical point, which occurs at a temperature and pressure of 31.1 °C and 73.9 bar respectively.…”

Section: Sco 2 Power Cyclesmentioning

confidence: 99%

Review of supercritical carbon dioxide (sCO2) technologies for high-grade waste heat to power conversion

2020

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In the European Industry, 275 TWh of thermal energy is rejected into the environment at temperatures beyond 300 °C. To recover some of this wasted energy, bottoming thermodynamic cycles using supercritical carbon dioxide (sCO 2) as working fluid are a promising technology for the conversion of the waste heat into power. CO 2 is a non-flammable and thermally stable compound, and due to its favourable thermo-physical properties in the supercritical state, can lead to high cycle efficiencies and a substantial reduction in size compared to alternative heat to power conversion technologies. In this work, a brief overview of the sCO 2 power cycle technology is presented. The main concepts behind this technology are highlighted, including key technological challenges with the major components such as turbomachinery and heat exchangers. The discussion focuses on heat to power conversion applications and benefits of the experience gained from the design and construction of a 50 kWe sCO 2 test facility at Brunel University London. A comparison between sCO 2 power cycles and conventional heat to power conversion systems is also provided. In particular, the operating ranges of sCO 2 and other heat to power systems are reported as a function of the waste heat source temperature and available thermal power. The resulting map provides insights for the preliminary selection of the most suitable heat to power conversion technology for a given industrial waste heat stream.

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Section: Sco 2 Power Cyclesmentioning

confidence: 99%

Review of supercritical carbon dioxide (sCO2) technologies for high-grade waste heat to power conversion

2020

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“…The net output power rate

{\dot{W}}_{net}

and exergy efficiency η ex are defined as follows:

{\dot{W}}_{net} = {\dot{W}}_{normalT 1} + {\dot{W}}_{normalT 2} + {\dot{W}}_{normalT 3} - {\dot{W}}_{normalP 1} - {\dot{W}}_{normalP, KCS} - {\dot{W}}_{normalP, ORC},

η_{ex} = \frac{{\overset{W}{true}}_{net}}{{\overset{E}{true}}_{in}}

…”

Section: System Modelmentioning

confidence: 99%

Multiobjective optimization for exergoeconomic analysis of an integrated cogeneration system

Zhang

Pan

et al. 2019

Int J Energy Res

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Summary In this paper, a novel cogeneration system integrating Kalina cycle, CO2 chemical absorption, process, and flash‐binary cycle is proposed to remove acid gases in the exhaust gas of solid oxide fuel cell (SOFC) system, improve the waste heat utilization, and reduce the cold energy consumed during CO2 capture. In the CO2 chemical absorption process, the methyldiethanolamine (MDEA) aqueous solution is utilized as a solvent, and feed temperature and absorber pressure are optimized via Aspen Plus software. The single‐objective and multiobjective optimization are carried out for the flash‐binary cycle subsystem. Results show that when the multiobjective optimization is applied to identify the exergoeconomic condition, the cogeneration system can simultaneously satisfy the high thermodynamic cycle efficiency and also the low product unit cost. The optimal results of the exergy efficiency, product unit cost, and normalized CO2 emissions obtained by Pareto chart were 75.84%, 3.248 $/GJ, and 13.14 kg/MWhr, respectively.

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“…The concept of exergy is more viable and practical in the cogeneration system since not only electric power is considered but also heating and cooling demands. Several studies in the literature also used exergy and efficiency as the criteria for the system performance achieved [45,47,48]. From the criteria, exergy destruction can also be used to indicate which part of the cogeneration components affects the system performance.…”

Section: Choosing the Criteria For Evaluationmentioning

confidence: 99%

A Comprehensive Review and Technical Guideline for Optimal Design and Operations of Fuel Cell-Based Cogeneration Systems

2019

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The need for energy is increasing from year to year and has to be fulfilled by developing innovations in energy generation systems. Cogeneration is one of the matured technologies in energy generation, which has been implemented since the last decade. Cogeneration is defined as energy generation unit that simultaneously produced electricity and heat from a single primary fuel source. Currently, the implementation of this system has been spread over the world for stationary and mobile power generation in residential, industrial and transportation uses. On the other hand, fuel cells as an emerging energy conversion device are potential prime movers for this cogeneration system due to its high heat production and flexibility in its fuel usage. Even though the fuel cell-based cogeneration system has been popularly implemented in research and commercialization sectors, the review regarding this technology is still limited. Focusing on the optimal design of the fuel cell-based cogeneration system, this study attempts to provide a comprehensive review, guideline and future prospects of this technology. With an up-to-date literature list, this review study becomes an important source for researchers who are interested in developing this system for future implementation.

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Exergy, economic and environmental impact assessment and optimization of a novel cogeneration system including a gas turbine, a supercritical CO2 and an organic Rankine cycle (GT-HRSG/SCO2)

Cited by 229 publications

References 56 publications

Review of supercritical carbon dioxide (sCO2) technologies for high-grade waste heat to power conversion

Review of supercritical carbon dioxide (sCO2) technologies for high-grade waste heat to power conversion

Multiobjective optimization for exergoeconomic analysis of an integrated cogeneration system

A Comprehensive Review and Technical Guideline for Optimal Design and Operations of Fuel Cell-Based Cogeneration Systems

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