Abstract
To rise the thermal efficiency of power generation systems andto meet stricter environmental regulations, improved system inte -gration based on renewable energy is a viable option. In this context,a syngas fuelled Brayton/Rankine combined power cycle integratedwith the Organic Rankine Cycle (ORC) is proposed and analysedfrom both energetic and exergetic point of views. A thermo-chemicalmodel was developed to predict the composition of syngas producedafter biomass gasification, and also, a thermodynamic model wasdeveloped, to determine the energetic and exergetic performance ofthe proposed triple cycle power generation system. We show thatboth first-law and second-law efficiencies of triple power cycle de -creases with the increase in pressure ratio and increases with highergas turbine inlet temperature. It is further shown that first-law andsecond-law efficiencies of solid-waste-derived syngas fuelled triplepower cycle are considerably higher than the rice husk derived syn -gas fuelled cycle. The worst performing components from irrevers-ibility point of view in the proposed triple cycle are the combustor,Heat Recovery Steam Generator (HRSG), and gasifier, respectively.Our results show that integration of ORC with the Biomass-FuelledIntegrated Gasification Combined Cycle (BIGCC) is very effective inimproving the thermal performance of the power plant and in reduc-ing external waste emissions.
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