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EPA Combined Heat and Power Partnership Biomass CHP Catalog Table 7-4. Biomass Stoker Boiler Power Generation System Capital Cost Estimates Installed Capital Costs Biomass prep-yard* Stoker boiler CHP—Back-Pressure (BP) Steam Turbine BP steam turbine capacity (MW) BP steam turbine cost Total capital cost—CHP/back-pressure turbine Cost $/kW—CHP/back-pressure turbine Power Only—Condensing Steam Turbine Condensing steam turbine capacity (MW) Condensing steam turbine cost Total capital cost—condensing turbine Cost $/kW—condensing turbine $2,639,660 $5,430,000 $1,991,000 $18,000,000 0.5 5.6 $425,000 $2,500,000 $4,630,660 $25,930,000 $9,260 $4,630 N/A 15.5 N/A $5,425,000 N/A $28,855,000 N/A $1,860 $7,110,000 $23,250,000 8.4 $3,250,000 $33,610,000 $4,000 23.3 $7,575,000 $37,935,000 $1,630 100 600 *Prep-Yard costs are estimated based on the capital cost curve developed in section 4.1.5 The largest component of capital costs for the two larger systems is for the boiler itself and associated equipment—making up 60 to 70 percent of the total plant cost. For the 100 tons/day plant, the biomass prep-yard costs are much higher on a per unit basis due to the high economies of scale for prep- yard capital costs. The 600 and 900 tons/day plants have capital costs of $1,860/kW and $1,630/kW, respectively, for a condensing turbine (power-only system), and $4,630/kW and $4,000/kW for a back- pressure CHP system. The $/kW unit costs for the 100 tons/day plant are much higher (more than $9,000/kW) because this small back-pressure CHP plant generates a small amount of power relative to its process steam output. Table 7-5 shows the estimated non-fuel O&M costs for each stoker boiler system. Labor costs are based on the assumption of 15 full-time staff for the two larger plants (one manager, three maintenance workers, eight shift workers, and four prep-yard workers) and six full-time staff for the 100 tons/day plant. Annual non-labor fixed O&M is assumed to be 2 percent of the capital cost. There is no labor portion of variable O&M, but the non-labor portion equals the cost of consumables such as chemicals, water, and electricity, needed to run the equipment at the prep-yard. These are assumed to collectively equal $0.001/kWh. Table 7-5. Biomass Stoker Boiler Power Systems Non-Fuel O&M Cost Estimates Prep-yard O&M Boiler section O&M Steam turbine O&M Total O&M Non-fuel O&M ($/kWh)/(back-pressure turbine) Non-fuel O&M ($/kWh) (condensing turbine) 7. Representative Biomass CHP System Cost and Performance Profiles $400,000 $160,000 $15,000 $575,000 $0.146 N/A $320,000 $1,095,000 $177,000 $1,592,000 $0.036 $0.013 $320,000 $1,110,000 $265,000 $1,695,000 $0.026 $0.009 Tons/Day (as received) O&M Cost Components 100 600 900 83 Tons/Day (as received) 900PDF Image | Biomass Combined Heat and Power Catalog of Technologies
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