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EPA Combined Heat and Power Partnership Biomass CHP Catalog Table 7-3. Biomass Stoker Boiler 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 77 77 77 63 71 71 35.4 297.5 446.3 22.5 212.0 318.0 0.9 0.9 0.9 275 750 750 494 750 750 20,000 165,000 250,000 0.5 5.6 8.4 15 150 150 19,400 173,000 260,000 62.9 70.5 70.5 N/A 150 150 N/A 6.9 14.7 N/A 9.8 17.5 N/A 12.6 20.4 N/A 15.5 23.3 17.8 17.8 Tons/Day (as received) Biomass Cases 100 600 900 The smaller, 100 tons/day boiler system is assumed to produce steam at relatively modest conditions—275 psig and 494° F. The larger plants are assumed to produce steam at 750 psig and 700° F. The higher the temperature and pressure of the steam produced, the greater the power production potential, though this higher production potential comes at the expense of greater capital cost for the boiler and increased fuel consumption to reach the higher steam energy levels. The tradeoff between process steam and power production is shown in Figure 7-2. Power production for the 900 tons/day plant can be varied from 23.3 MW with a condensing turbine and no process steam to 8.4 MW and 270,000 lb/hr of 150 psig saturated steam with a full back-pressure turbine. As the figure shows, power output versus process steam output is a linear relationship. 7. Representative Biomass CHP System Cost 81 and Performance ProfilesPDF Image | Biomass Combined Heat and Power Catalog of Technologies
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