Thermodynamic Analyses of Biomass Gasification Integrated Externally Fired, Post-Firing and Dual-Fuel Combined Cycles

Abstract

Abstract:In the present work, the results are reported of the energy and exergy analyses of three biomass-related processes for electricity generation: the biomass gasification integrated externally fired combined cycle, the biomass gasification integrated dual-fuel combined cycle, and the biomass gasification integrated post-firing combined cycle. The energy efficiency for the biomass gasification integrated post-firing combined cycle is 3% to 6% points higher than for the other cycles. Although the efficiency of the externally fired biomass combined cycle is the lowest, it has an advantage in that it only uses biomass. The energy and exergy efficiencies are maximized for the three configurations at particular values of compressor pressure ratios, and increase with gas turbine inlet temperature. As pressure ratio increases, the mass of air per mass of steam decreases for the biomass gasification integrated post-firing combined cycle, but the 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 dual-fuel cycle exhibits the highest exergy efficiency and that for the post-firing cycle the lowest. Another OPEN ACCESSSustainability 2015, 7 1249 benefit of the biomass gasification integrated externally fired combined cycle is that it exhibits the highest air preheater and heat recovery steam generator exergy efficiencies.

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“…The thermal efficiency of the combustion chamber is 97% 77 . The value of the pressure drop through each component is 5% 78 …”

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“…Another interesting article about combined cycle power plant (CCPP) [24] presents energetic and exergetic analyses are conducted using operating data for Sabiya. In the work [25], the results are reported of the energy and exergy analyses of three Moreover, there are no such analyses in the literature. The available sources focus mainly on the advantages related to the increase of efficiency, reduction of specific emission of pollutants or increase of power [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

“…Another interesting article about combined cycle power plant (CCPP) [24] presents energetic and exergetic analyses are conducted using operating data for Sabiya. In the work [25], the results are reported of the energy and exergy analyses of three biomass-related processes for electricity generation: the biomass gasification integrated externally fired combined cycle, the biomass gasification integrated dual-fuel combined cycle, and the biomass gasification integrated post-firing combined cycle. The energy efficiency for the biomass gasification integrated post-firing combined cycle is 3% to 6% points higher than for the other cycles.…”

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“… 1 The produced gas may also be used directly to generate heat and power through combustion. 2 Integrated gasification combined cycle systems have higher thermal efficiency compared to direct combustion of biomass. Currently, most gasification plants use coal as a resource, and replacing coal with biomass would be beneficial as biomass is converted into value-added products.…”