Enhancement of waste heat recovery from exhaust stack silencers in A simple cycle gas turbine
In this paper, a novel simple cycle gas turbine (GT) heat recovery system was modeled and evaluated through a computational method. Heat transfer channels were integrated into the existing nose and tail surfaces of the exhaust stack silencer baffles to avoid added turbine back-pressure, which is an...
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Elsevier
2025-05-01
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| Series: | International Journal of Thermofluids |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666202725001843 |
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| author | Bouria Faqihi Fadi Ghaith |
| author_facet | Bouria Faqihi Fadi Ghaith |
| author_sort | Bouria Faqihi |
| collection | DOAJ |
| description | In this paper, a novel simple cycle gas turbine (GT) heat recovery system was modeled and evaluated through a computational method. Heat transfer channels were integrated into the existing nose and tail surfaces of the exhaust stack silencer baffles to avoid added turbine back-pressure, which is an issue with some of the existing waste heat recovery (WHR) models. The recovered heat was utilized for fuel gas heating, leading to energy savings and reduced CO2 emissions. Based on the conducted parametric studies, an enhanced heat transfer surface design was proposed with a combination of heat transfer from the nose and the modified tail that includes a wavy pattern.The description of the computational domain, mesh setup and mesh independence study were presented, and the heat transfer coefficient (HTC) was calculated. A comparison study was performed for the HTC values obtained by the computational model and the mathematical model [1] for the heat recovery from the silencers nose and tail. The results showed a variation of 16.8 % and 1.4 %, respectively. These values are within the typical accuracy range for common correlations of heat transfer in cross-flow. The net energy recovery ranged between 2.45 and 4.54 MW for different heat recovery combinations. The recovered heat that used in fuel gas heating resulted in fuel gas savings up to 68.97 kg/h and CO2 emissions reduction up to 1517 Tons/year.Further, the obtained results were qualitatively analyzed using flow visualization of the computational model. Based on the obtained findings, several options for further enhancement of heat recovery were proposed. |
| format | Article |
| id | doaj-art-65147b1b63f04c14a25e4b52b767268a |
| institution | OA Journals |
| issn | 2666-2027 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Thermofluids |
| spelling | doaj-art-65147b1b63f04c14a25e4b52b767268a2025-08-20T02:14:43ZengElsevierInternational Journal of Thermofluids2666-20272025-05-012710123710.1016/j.ijft.2025.101237Enhancement of waste heat recovery from exhaust stack silencers in A simple cycle gas turbineBouria Faqihi0Fadi Ghaith1School of Engineering and Physical Sciences, Heriot-Watt University, P O Box 501745, Dubai Knowledge Park, Dubai, United Arab EmiratesCorresponding author.; School of Engineering and Physical Sciences, Heriot-Watt University, P O Box 501745, Dubai Knowledge Park, Dubai, United Arab EmiratesIn this paper, a novel simple cycle gas turbine (GT) heat recovery system was modeled and evaluated through a computational method. Heat transfer channels were integrated into the existing nose and tail surfaces of the exhaust stack silencer baffles to avoid added turbine back-pressure, which is an issue with some of the existing waste heat recovery (WHR) models. The recovered heat was utilized for fuel gas heating, leading to energy savings and reduced CO2 emissions. Based on the conducted parametric studies, an enhanced heat transfer surface design was proposed with a combination of heat transfer from the nose and the modified tail that includes a wavy pattern.The description of the computational domain, mesh setup and mesh independence study were presented, and the heat transfer coefficient (HTC) was calculated. A comparison study was performed for the HTC values obtained by the computational model and the mathematical model [1] for the heat recovery from the silencers nose and tail. The results showed a variation of 16.8 % and 1.4 %, respectively. These values are within the typical accuracy range for common correlations of heat transfer in cross-flow. The net energy recovery ranged between 2.45 and 4.54 MW for different heat recovery combinations. The recovered heat that used in fuel gas heating resulted in fuel gas savings up to 68.97 kg/h and CO2 emissions reduction up to 1517 Tons/year.Further, the obtained results were qualitatively analyzed using flow visualization of the computational model. Based on the obtained findings, several options for further enhancement of heat recovery were proposed.http://www.sciencedirect.com/science/article/pii/S2666202725001843Gas turbineSimple cycleComputational analysisHeat RecoveryExhaust System |
| spellingShingle | Bouria Faqihi Fadi Ghaith Enhancement of waste heat recovery from exhaust stack silencers in A simple cycle gas turbine International Journal of Thermofluids Gas turbine Simple cycle Computational analysis Heat Recovery Exhaust System |
| title | Enhancement of waste heat recovery from exhaust stack silencers in A simple cycle gas turbine |
| title_full | Enhancement of waste heat recovery from exhaust stack silencers in A simple cycle gas turbine |
| title_fullStr | Enhancement of waste heat recovery from exhaust stack silencers in A simple cycle gas turbine |
| title_full_unstemmed | Enhancement of waste heat recovery from exhaust stack silencers in A simple cycle gas turbine |
| title_short | Enhancement of waste heat recovery from exhaust stack silencers in A simple cycle gas turbine |
| title_sort | enhancement of waste heat recovery from exhaust stack silencers in a simple cycle gas turbine |
| topic | Gas turbine Simple cycle Computational analysis Heat Recovery Exhaust System |
| url | http://www.sciencedirect.com/science/article/pii/S2666202725001843 |
| work_keys_str_mv | AT bouriafaqihi enhancementofwasteheatrecoveryfromexhauststacksilencersinasimplecyclegasturbine AT fadighaith enhancementofwasteheatrecoveryfromexhauststacksilencersinasimplecyclegasturbine |