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EPA Combined Heat and Power Partnership Biomass CHP Catalog Table 7-7. Biomass Circulating Fluidized Bed Power Generation System Input and Output Requirements Biomass Fuel Characteristics Energy content (dry) (Btu/lb) Moisture content (%) Energy content (as received) (Btu/lb) Biomass Conversion Boiler efficiency (zero moisture) (%) Boiler efficiency (moisture adjusted) (%) Heat input to boiler (MMBtu/hr) Heat to the steam (MMBtu/hr) Plant capacity factor Boiler Steam Conditions Boiler output pressure (psig) Boiler output temperature (°F) Nominal steam flow (lb/hr) Steam Turbine Options CHP—Back-Pressure Turbine Electric output (MW) Process steam conditions (psig [saturated]) Process steam flow (lb/hr) CHP efficiency (%) CHP—Extraction Turbine Process steam conditions (psig [saturated]) Electric output (MW) (150,000 lb/hr steam) Electric output (MW) (100,000 lb/hr steam) Electric output (MW) (50,000 lb/hr steam) Power Only—Condensing Turbine Electric output (MW) Electric efficiency (%) 8,500 8,500 8,500 50 30 30 4,250 5,950 5,950 80 80 80 67 75 75 35.4 297.5 446.3 23.7 223.1 334.7 0.9 0.9 0.9 275 750 750 494 750 750 20,000 175,000 260,000 0.5 5.9 8.8 15 150 150 20,300 181,100 271,600 66.1 73.7 73.7 N/A 150 150 N/A 7.6 15.7 N/A 10.5 18.6 N/A 13.4 21.5 N/A 16.2 24.3 N/A 18.6 18.6 Tons/Day (as received) Biomass Cases 100 600 900 Table 7-8 shows the estimated capital costs for the three circulating fluidized bed power systems. The capital requirements for the integrated system include the prep-yard, circulating fluidized bed boiler and supporting systems, and the steam turbine generator and supporting systems. Again, capital cost estimates are based on installing a greenfield system—there is no existing prep-yard, boiler, or generating equipment in place. Capital cost for the circulating fluidized bed systems are significantly higher than the stoker power systems. Prep-yard costs are equal to the stoker prep-yard costs because they are a function of the amount of biomass handled, and steam turbine costs are only slightly higher than the stoker systems. As discussed in Chapter 5, the circulating fluidized bed costs are significantly higher than similarly sized stoker-boilers. Overall, the $/kW cost of the 100 tons/day CHP system has more than doubled to over $20,000/kW. The costs for the larger CHP systems have increased by about $900/kW, almost entirely due to the higher cost of the boiler. 7. Representative Biomass CHP System Cost 86 and Performance ProfilesPDF Image | Biomass Combined Heat and Power Catalog of Technologies
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