Optimization of a novel cogeneration system including a gas turbine, a supercritical CO2 recompression cycle, a steam power cycle and an organic Rankine cycle

Hou, Shengya; Zhou, Yaodong; Yu, Liang; Zhang, Fengyuan; Cao, Sheng; Wu, Yuandan

doi:10.1016/j.enconman.2018.07.042

Cited by 72 publications

(10 citation statements)

References 28 publications

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“…to 45.12%) than that from 200 bar to 300 bar (efficiency increases from 45.12% to 47.63%). It needs to be highlighted, however, that such linear and non-linear trends for temperature and pressure, respectively, are in agreement with the results reported for s-CO 2 cycles in different applications [29][30][31][32]. intolerable.…”

Section: Sensitivity Analysissupporting

confidence: 84%

Staged oxy-fuel natural gas combined cycle

Khallaghi

Hanak

2019

Applied Thermal Engineering

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Exhaust gas recirculation (EGR) in conventional natural gas-fired oxy-combustion cycles is required to maintain the combustion temperature at an allowable level. However, EGR is not beneficial from the system performance perspective. It is difficult to achieve in oxy-fuel cycles due to the high pressure and increased pressure drop in such systems. Consequently, alternative options to control the combustion temperature need to be considered. In this study, staged oxy-fuel natural gas combined cycle (SOF-NGCC) was proposed, which does not require EGR, and its feasibility was evaluated. A process model was developed in Aspen Plus in order to evaluate the thermodynamic performance of the proposed system and to benchmark it against the Allam cycle and conventional NGCC. The optimum net efficiency of the proposed cycle (47.63-51.32%) was shown to be lower than that for Allam cycle (54.58%) and the conventional NGCC without post-combustion capture (PCC) (56.95%). However, the SOF-NGCC is less complex and requires smaller equipment than the Allam cycle. This is mostly because the combined volumetric flow rate into expanders in both topping and bottoming cycles is approximately 25% of that estimated for the Allam cycle. Moreover, with a backpressure of 35 bar, no further compression is required prior to the CO 2 purification unit.

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Section: Sensitivity Analysissupporting

confidence: 84%

Staged oxy-fuel natural gas combined cycle

Khallaghi

Hanak

2019

Applied Thermal Engineering

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“…28 The exhaust heat from the hot end of HRHE1 further enters into HRHE2 to heat the thermal conductivity medium, and the nal outlet temperature of the exhaust gas (g3) keeps constant. The operation principle of the CCES system is as follows: under the energy storage conditions, the CO 2 stored in the low-pressure storage tank (LST) ows out, and aer maintaining a constant pressure (13)(14) by the throttle valve1, which makes the working medium CO 2 maintain near the critical state point, and then the CO 2 is compressed (14)(15) and stored in the high-pressure storage tank (HST) by using the rich electrical energy of the system to drive the energy storage compressor (EC) (15)(16). Under the energy release conditions, the high-pressure CO 2 ows out from the HST.…”

Section: System Descriptionmentioning

confidence: 99%

Performance study of a supercritical CO₂ Brayton cycle coupled with a compressed CO₂ energy storage system for waste heat recovery of ship gas turbines under variable load conditions

Guo

et al. 2022

Sustainable Energy Fuels

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“…A CO 2 cycle can be used as the bottom cycle to recover the exhaust heat of a heat engine, such as a gas turbine or internal combustion engine, and the overall energy efficiency can be improved. Hou et al (Hou et al, 2018) designed a combined cycle consisting of a gas turbine, a recompression sCO 2 cycle, a steam Rankine cycle, and an ORC with a zeotropic working fluid. Compared with the traditional gas-steam combined system, the efficiency of the new combined system was increased by 2.33%.…”

Section: Waste Heat Recoverymentioning

confidence: 99%

System Design and Application of Supercritical and Transcritical CO2 Power Cycles: A Review

2021

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Improving energy efficiency and reducing carbon emissions are crucial for the technological advancement of power systems. Various carbon dioxide (CO2) power cycles have been proposed for various applications. For high-temperature heat sources, the CO2 power system is more efficient than the ultra-supercritical steam Rankine cycle. As a working fluid, CO2 exhibits environmentally friendly properties. CO2 can be used as an alternative to organic working fluids in small- and medium-sized power systems for low-grade heat sources. In this paper, the main configurations and performance characteristics of CO2 power systems are reviewed. Furthermore, recent system improvements of CO2 power cycles, including supercritical Brayton cycles and transcritical Rankine cycles, are presented. Applications of combined systems and their economic performance are discussed. Finally, the challenges and potential future developments of CO2 power cycles are discussed. CO2 power cycles have their advantages in various applications. As working fluids must exhibit environmentally-friendly properties, CO2 power cycles provide an alternative for power generation, especially for low-grade heat sources.

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Optimization of a novel cogeneration system including a gas turbine, a supercritical CO2 recompression cycle, a steam power cycle and an organic Rankine cycle

Cited by 72 publications

References 28 publications

Staged oxy-fuel natural gas combined cycle

Staged oxy-fuel natural gas combined cycle

Performance study of a supercritical CO₂ Brayton cycle coupled with a compressed CO₂ energy storage system for waste heat recovery of ship gas turbines under variable load conditions

System Design and Application of Supercritical and Transcritical CO2 Power Cycles: A Review

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Optimization of a novel cogeneration system including a gas turbine, a supercritical CO2 recompression cycle, a steam power cycle and an organic Rankine cycle

Cited by 72 publications

References 28 publications

Staged oxy-fuel natural gas combined cycle

Staged oxy-fuel natural gas combined cycle

Performance study of a supercritical CO2 Brayton cycle coupled with a compressed CO2 energy storage system for waste heat recovery of ship gas turbines under variable load conditions

System Design and Application of Supercritical and Transcritical CO2 Power Cycles: A Review

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Performance study of a supercritical CO₂ Brayton cycle coupled with a compressed CO₂ energy storage system for waste heat recovery of ship gas turbines under variable load conditions