This study evaluates the energy and economic performance of IGCC power plants integrated with a syngas storage section and a gas turbine for intermediate and peaking load service. These integrated IGCC systems can perform a load-following service since a portion of the produced syngas is stored during periods of low energy demand and is subsequently used in the gas turbine during periods of peaking demand. The study aims to evaluate main performance of these power generation plants as a function of the required electrical load curve. In particular, the amount of stored syngas and the overall conversion efficiency have been evaluated as a function of a reference duty-cycle. The results of the study show that in the field of duty-cycles of more likely interest (daily duration of the peaking period of 2-6 hours and base-load/peaking-load power ratio of 0,35-0,70), a fraction from 12% to 18% of the produced syngas needs to be stored. Moreover, conversion efficiency of IGCC power plants with syngas storage decreases by about 2-4 percentage points in comparison to the corresponding base-load IGCC power plant. A preliminary economic analysis was also carried out to evaluate the energy production cost of such load-following power plants. The results of the economic analysis show that energy production cost of IGCC power plants with syngas storage increases by increasing the fraction of stored syngas and by decreasing the duration of the peaking period. In particular, by storing 5-15% of the syngas produced by the coal gasification section and with reference to a duration of the peaking period of 3-6 hours/day, the energy production cost of IGCC-TG systems is 5-10% higher than base-load IGCC power plants. Moreover, the marginal energy production cost of the peaking energy ranges from 100 to 130 €/MWh.
Impianti IGCC con accumulo del syngas per servizio di carico intermedio e di punta
CAU, GIORGIO;COCCO, DANIELE;TOLA, VITTORIO
2012-01-01
Abstract
This study evaluates the energy and economic performance of IGCC power plants integrated with a syngas storage section and a gas turbine for intermediate and peaking load service. These integrated IGCC systems can perform a load-following service since a portion of the produced syngas is stored during periods of low energy demand and is subsequently used in the gas turbine during periods of peaking demand. The study aims to evaluate main performance of these power generation plants as a function of the required electrical load curve. In particular, the amount of stored syngas and the overall conversion efficiency have been evaluated as a function of a reference duty-cycle. The results of the study show that in the field of duty-cycles of more likely interest (daily duration of the peaking period of 2-6 hours and base-load/peaking-load power ratio of 0,35-0,70), a fraction from 12% to 18% of the produced syngas needs to be stored. Moreover, conversion efficiency of IGCC power plants with syngas storage decreases by about 2-4 percentage points in comparison to the corresponding base-load IGCC power plant. A preliminary economic analysis was also carried out to evaluate the energy production cost of such load-following power plants. The results of the economic analysis show that energy production cost of IGCC power plants with syngas storage increases by increasing the fraction of stored syngas and by decreasing the duration of the peaking period. In particular, by storing 5-15% of the syngas produced by the coal gasification section and with reference to a duration of the peaking period of 3-6 hours/day, the energy production cost of IGCC-TG systems is 5-10% higher than base-load IGCC power plants. Moreover, the marginal energy production cost of the peaking energy ranges from 100 to 130 €/MWh.
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