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Performance Evaluation of an Organic Rankine Cycle Fed by Waste Heat Recovered from CO2 Capture Section

  • Natural gas-fueled combined cycle (NGCC) allows to reach the best performance among power plants fed by fossil fuels, but causes considerable CO2 emissions. With the aim of reducing greenhouse gases impact, NGCC could be integrated with post-combustion CO2 removal systems, typically based on chemical solvents like amines, that cause very large net efficiency penalties (about 9-12 percentage points at 90% overall CO2 capture). To reduce these high capture penalties, exhaust gas recirculation (EGR) has been studied. To further enhance the overall plant efficiency, the recovery of available low temperature heat from the solvent-based CO2 removal systems could be also performed. Low temperature heat is available in flue gas coolers (80-100 degrees C), in the amine reboiler water cooling (130-140 degrees C) and in the splitter condenser (100-130 degrees C). This waste thermal energy could be recovered by means of an Organic Rankine Cycle (ORC) that is able to convert heat into electricity efficiently even at comparably low temperatures.Natural gas-fueled combined cycle (NGCC) allows to reach the best performance among power plants fed by fossil fuels, but causes considerable CO2 emissions. With the aim of reducing greenhouse gases impact, NGCC could be integrated with post-combustion CO2 removal systems, typically based on chemical solvents like amines, that cause very large net efficiency penalties (about 9-12 percentage points at 90% overall CO2 capture). To reduce these high capture penalties, exhaust gas recirculation (EGR) has been studied. To further enhance the overall plant efficiency, the recovery of available low temperature heat from the solvent-based CO2 removal systems could be also performed. Low temperature heat is available in flue gas coolers (80-100 degrees C), in the amine reboiler water cooling (130-140 degrees C) and in the splitter condenser (100-130 degrees C). This waste thermal energy could be recovered by means of an Organic Rankine Cycle (ORC) that is able to convert heat into electricity efficiently even at comparably low temperatures. N-Butane was found to be as the most promising organic working fluid for the cycle operating temperatures and pressures. ORC produces additional electrical power improving the global performance of the power plant, for example, up to 1-1.5 percentage points in efficiency.show moreshow less

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Metadaten
Author:Vittorio Tola, Matthias FinkenrathORCiDGND
URL / DOI:https://dergipark.org.tr/tr/pub/ijot/issue/5798/77141
DOI:https://doi.org/10.5541/ijot.5000106929
Identifier:2146-1511 OPAC HS OPAC extern
Identifier:1301-9724 OPAC HS OPAC extern
Parent Title (German):International Journal of Thermodynamics
Publisher:ITU Fac. of Mechanical Engineering
Place of publication:Gümüşsuyu-İstanbul
Document Type:Article
Language:English
Year of first Publication:2015
Tag:CO2 capture; NGCC; ORC; low temperature heat recovery
Volume:18
Issue:4
Number of pages:9 Seiten
First Page:225
Last Page:233
Institutes:Fakultät Maschinenbau
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 66 Chemische Verfahrenstechnik
Open Access:open_access
Research focus:FSP1: Energie
Publication Lists:Finkenrath, Matthias
Publication reviewed:begutachtet
Release Date:2019/11/25
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