Comparative Thermodynamic Environmental and Economic Analyses of Combined Cycles Using Air and Supercritical CO<sub>2</sub> in the Bottoming Cycles for Power Generation by Gas Turbine Waste Heat Recovery
This study aims to improve existing fossil gas turbine power plants by waste heat recovery. These power plants function with an air simple cycle (ASC) and are implemented where water resources are limited. Modeling and simulation of ASC and two advanced energy conversion systems are performed. They...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-11-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/15/23/9066 |
| _version_ | 1827643177906995200 |
|---|---|
| author | Faiza Brahimi Baya Madani Messaouda Ghemmadi |
| author_facet | Faiza Brahimi Baya Madani Messaouda Ghemmadi |
| author_sort | Faiza Brahimi |
| collection | DOAJ |
| description | This study aims to improve existing fossil gas turbine power plants by waste heat recovery. These power plants function with an air simple cycle (ASC) and are implemented where water resources are limited. Modeling and simulation of ASC and two advanced energy conversion systems are performed. They are the gas turbine–air bottoming cycle (GT-ABC) and gas turbine–supercritical carbon dioxide bottoming cycle (GT-sc-CO<sub>2</sub>BC). The main intent is to assess the benefits of employing sc-CO<sub>2</sub> as a working fluid in a closed Brayton bottoming cycle compared to air, based on the energetic and exergetic performance and economic and environmental impact. Analyses of ASC, GT-ABC, and GT-sc-CO<sub>2</sub>BC are performed for various topping gas turbine powers: large (plant 1); medium (plant 2); and low (plant 3). The results of the energetic and exergetic analyses indicate that there is a significant improvement in the output power (ranging from 22% to 25%); and energy and exergy efficiencies of GT-ABC and GT-sc-CO<sub>2</sub>BC (up to 8% and 11%, respectively) compared to that of ASC. To provide better insight into the behavior of these technologies and achieve their better integration, we investigate the influence of varying the bottoming compressor pressure ratio, the ambient temperature, and the gas flow rate in the bottoming cycle. The results of the environmental and economic analyses show that the amount of CO<sub>2</sub> emissions in GT-sc-CO<sub>2</sub>BC is reduced by 10% more than in GT ABC. The results also show that GT-ABC improves the NPV between 17.69% and 30% but GT-sc-CO<sub>2</sub>BC improves it even more, between 25.79% and 33.30%. |
| first_indexed | 2024-03-09T17:48:53Z |
| format | Article |
| id | doaj.art-eb4974d664604e1bbd11a214428133b4 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T17:48:53Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-eb4974d664604e1bbd11a214428133b42023-11-24T10:54:47ZengMDPI AGEnergies1996-10732022-11-011523906610.3390/en15239066Comparative Thermodynamic Environmental and Economic Analyses of Combined Cycles Using Air and Supercritical CO<sub>2</sub> in the Bottoming Cycles for Power Generation by Gas Turbine Waste Heat RecoveryFaiza Brahimi0Baya Madani1Messaouda Ghemmadi2Département de Génie Mécanique, Faculté de Technologie, Université M’hamed Bougara, Boumerdes 35000, AlgeriaDépartement de Génie Mécanique, Faculté de Technologie, Université M’hamed Bougara, Boumerdes 35000, AlgeriaDépartement de Génie Mécanique, Faculté de Technologie, Université M’hamed Bougara, Boumerdes 35000, AlgeriaThis study aims to improve existing fossil gas turbine power plants by waste heat recovery. These power plants function with an air simple cycle (ASC) and are implemented where water resources are limited. Modeling and simulation of ASC and two advanced energy conversion systems are performed. They are the gas turbine–air bottoming cycle (GT-ABC) and gas turbine–supercritical carbon dioxide bottoming cycle (GT-sc-CO<sub>2</sub>BC). The main intent is to assess the benefits of employing sc-CO<sub>2</sub> as a working fluid in a closed Brayton bottoming cycle compared to air, based on the energetic and exergetic performance and economic and environmental impact. Analyses of ASC, GT-ABC, and GT-sc-CO<sub>2</sub>BC are performed for various topping gas turbine powers: large (plant 1); medium (plant 2); and low (plant 3). The results of the energetic and exergetic analyses indicate that there is a significant improvement in the output power (ranging from 22% to 25%); and energy and exergy efficiencies of GT-ABC and GT-sc-CO<sub>2</sub>BC (up to 8% and 11%, respectively) compared to that of ASC. To provide better insight into the behavior of these technologies and achieve their better integration, we investigate the influence of varying the bottoming compressor pressure ratio, the ambient temperature, and the gas flow rate in the bottoming cycle. The results of the environmental and economic analyses show that the amount of CO<sub>2</sub> emissions in GT-sc-CO<sub>2</sub>BC is reduced by 10% more than in GT ABC. The results also show that GT-ABC improves the NPV between 17.69% and 30% but GT-sc-CO<sub>2</sub>BC improves it even more, between 25.79% and 33.30%.https://www.mdpi.com/1996-1073/15/23/9066exhaust heat recoverygas turbine improvementcombined cycleair bottoming cyclesupercritical carbon dioxide bottoming cycle |
| spellingShingle | Faiza Brahimi Baya Madani Messaouda Ghemmadi Comparative Thermodynamic Environmental and Economic Analyses of Combined Cycles Using Air and Supercritical CO<sub>2</sub> in the Bottoming Cycles for Power Generation by Gas Turbine Waste Heat Recovery Energies exhaust heat recovery gas turbine improvement combined cycle air bottoming cycle supercritical carbon dioxide bottoming cycle |
| title | Comparative Thermodynamic Environmental and Economic Analyses of Combined Cycles Using Air and Supercritical CO<sub>2</sub> in the Bottoming Cycles for Power Generation by Gas Turbine Waste Heat Recovery |
| title_full | Comparative Thermodynamic Environmental and Economic Analyses of Combined Cycles Using Air and Supercritical CO<sub>2</sub> in the Bottoming Cycles for Power Generation by Gas Turbine Waste Heat Recovery |
| title_fullStr | Comparative Thermodynamic Environmental and Economic Analyses of Combined Cycles Using Air and Supercritical CO<sub>2</sub> in the Bottoming Cycles for Power Generation by Gas Turbine Waste Heat Recovery |
| title_full_unstemmed | Comparative Thermodynamic Environmental and Economic Analyses of Combined Cycles Using Air and Supercritical CO<sub>2</sub> in the Bottoming Cycles for Power Generation by Gas Turbine Waste Heat Recovery |
| title_short | Comparative Thermodynamic Environmental and Economic Analyses of Combined Cycles Using Air and Supercritical CO<sub>2</sub> in the Bottoming Cycles for Power Generation by Gas Turbine Waste Heat Recovery |
| title_sort | comparative thermodynamic environmental and economic analyses of combined cycles using air and supercritical co sub 2 sub in the bottoming cycles for power generation by gas turbine waste heat recovery |
| topic | exhaust heat recovery gas turbine improvement combined cycle air bottoming cycle supercritical carbon dioxide bottoming cycle |
| url | https://www.mdpi.com/1996-1073/15/23/9066 |
| work_keys_str_mv | AT faizabrahimi comparativethermodynamicenvironmentalandeconomicanalysesofcombinedcyclesusingairandsupercriticalcosub2subinthebottomingcyclesforpowergenerationbygasturbinewasteheatrecovery AT bayamadani comparativethermodynamicenvironmentalandeconomicanalysesofcombinedcyclesusingairandsupercriticalcosub2subinthebottomingcyclesforpowergenerationbygasturbinewasteheatrecovery AT messaoudaghemmadi comparativethermodynamicenvironmentalandeconomicanalysesofcombinedcyclesusingairandsupercriticalcosub2subinthebottomingcyclesforpowergenerationbygasturbinewasteheatrecovery |