The use of biogas in micro gas turbines (MGTs) generallyrequires invasive structural modifications to fuel compressionunits, control valves and combustor. Costs associated with themodifications significantly reduce the benefits of a rational andsustainable exploitation of energy resources of lower value asthe biogas.In order to overcome this aspect, in a recent paper theauthors proposed a dual fuel approach, identifying a structurallynon-invasive and cost-effective technical solution to increase theCO2 concentration in the fuel and to extend the operation domainof the MGT when low calorific value fuels are used. In that study,it has been evaluated, implemented and tested an innovativemanagement strategy of fuel feeding and combustion.Experimental preliminary tests validated the idea of a newsupply strategy for exceeding the current limits of biogasexploitation as MGT fuel.With this approach the MGT operating domain has beenextended, increasing more than twice the CO2 concentrationlimit than experimentally validated limit available in literature.In this study the authors present a more extensiveinvestigation concerning the energetic performance and theenvironmental impact of a 100 kWe MGT Turbec T100 whenfuelled with a mixture of natural gas and carbon dioxide(synthesis biogas) in the dual fuel approach, by varying CO2concentration in the fuel at part load condition.The data acquired by an extensive experimental campaign,in terms of thermodynamic parameters and gaseous exhaustemissions, are presented and compared with the results ofnumerical simulations.A 3D CFD analysis of the combustion process is alsopresented. Initial and boundary conditions of the numericalapproach were obtained from a previous validated 0Dthermodynamic matching model.The synergistic activity between numerical modeling andexperimental work allows to analyze and explain the overallbehavior of the micro gas turbine in the dual fuel mode withbiogas fuel.The study shows that the micro gas turbine can stablyoperate in a dual fuel mode until the CO2 content rises above25%.
A Biogas Fuelled Micro Gas Turbine: Energetic Performance and Environmental Impact Analysis.
F Chiariello;F Reale;R Calabria;P Massoli
2019
Abstract
The use of biogas in micro gas turbines (MGTs) generallyrequires invasive structural modifications to fuel compressionunits, control valves and combustor. Costs associated with themodifications significantly reduce the benefits of a rational andsustainable exploitation of energy resources of lower value asthe biogas.In order to overcome this aspect, in a recent paper theauthors proposed a dual fuel approach, identifying a structurallynon-invasive and cost-effective technical solution to increase theCO2 concentration in the fuel and to extend the operation domainof the MGT when low calorific value fuels are used. In that study,it has been evaluated, implemented and tested an innovativemanagement strategy of fuel feeding and combustion.Experimental preliminary tests validated the idea of a newsupply strategy for exceeding the current limits of biogasexploitation as MGT fuel.With this approach the MGT operating domain has beenextended, increasing more than twice the CO2 concentrationlimit than experimentally validated limit available in literature.In this study the authors present a more extensiveinvestigation concerning the energetic performance and theenvironmental impact of a 100 kWe MGT Turbec T100 whenfuelled with a mixture of natural gas and carbon dioxide(synthesis biogas) in the dual fuel approach, by varying CO2concentration in the fuel at part load condition.The data acquired by an extensive experimental campaign,in terms of thermodynamic parameters and gaseous exhaustemissions, are presented and compared with the results ofnumerical simulations.A 3D CFD analysis of the combustion process is alsopresented. Initial and boundary conditions of the numericalapproach were obtained from a previous validated 0Dthermodynamic matching model.The synergistic activity between numerical modeling andexperimental work allows to analyze and explain the overallbehavior of the micro gas turbine in the dual fuel mode withbiogas fuel.The study shows that the micro gas turbine can stablyoperate in a dual fuel mode until the CO2 content rises above25%.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
