Avoidable and unavoidable exergy destructions of a fluidized bed coal combustor and a heat recovery steam generator

Abstract

Advanced exergy analysis was performed using the actual operational data taken from a fluidized bed coal combustor (FBCC) and a heat recovery steam generator (HRSG) in a textile plant located at Torbalı, Izmir. First, the conventional exergy analysis of the units was carried out. The exergetic efficiencies of the units were found to be 44.2% and 46.2%, respectively. Advanced exergy analysis was then performed by splitting the exergy destructions of the units into avoidable and unavoidable parts. The avoidable exergy destruction rates of the FBCC and the HRSG were determined to be 2999kW and 760kW according to the measurements. Correspondingly, the exergy efficiencies were modified to 53.1% and 48.1%, respectively.