Abstract
In the present work, the results are reported of energy and exergy analyses of three biomass-related processes for electricity generation: externally fired biomass combined cycle, biomass integrated co-firing combined cycle and biomass integrated post-firing combined cycle. The energy efficiency for the biomass integrated post-firing combined cycle is 3% to 6% points higher than for the other cycles. The energy and exergy efficiencies are maximized for the three configurations at particular values of compressor pressure ratio, and increase with gas turbine inlet temperature. As pressure ratio increases, the mass of air per mass of steam decreases for biomass integrated post-firing combined cycle, but pressure ratio has little influence on the ratio of mass of air per mass of steam for the other cycles. The gas turbine exergy efficiency is the highest for the three configurations. The combustion chamber for the co-firing cycle exhibits the highest exergy efficiency and that for the post-firing cycle the lowest.
Highlights
There are many types of biomass gasification systems [1, 2, 3, 4]
For the biomass integrated co-fired combined cycle (BICFCC) the amount of natural gas is fixed at 0.01 kmol/s
All efficiencies are observed to be maximized at particular values of the gas turbine inlet temperature
Summary
There are many types of biomass gasification systems [1, 2, 3, 4]. Biomass integrated gasification combined cycles have the potential to provide electricity efficiently, cost-effectively and cleanly [5, 6], but research is still needed to enhance performance [7, 8, 9]. The energy efficiency for the biomass integrated post-firing combined cycle is 3% to 6% points higher than for the other cycles. The energy and exergy efficiencies are maximized for the three configurations at particular values of compressor pressure ratio, and increase with gas turbine inlet temperature. The combustion chamber for the co-firing cycle exhibits the highest exergy efficiency and that for the post-firing cycle the lowest.
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