Renewable Energy Technology Assessments - Kauai Island Utility ...

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Kaua’i Island Utility Cooperative Renewable Energy Technology Assessments 7.0 Biomass and Municipal Solid Waste Due to slightly better economics in the screening and less redundant O&M planning needs, Black & Veatch selected Option B for further analysis. A simple schematic showing this option is shown in Figure 7-6. In this arrangement, the biomass boiler operates at lower steam conditions to match the lower steam conditions for the MSW. This hurts the biomass cycle efficiency. The combined steam from the two boilers is fed to a condensing turbine. Exhaust steam from the steam turbine generator is condensed and recirculated back through the boiler feed system. Raw MSW Mass burn Biomass Biomass boiler Figure 7-6. Combined Biomass and MSW Schematic 7.5 Power and Energy Production Fly ash to landfill Bottom ash for processing Electricity 7.5.1 Plant Performance Black & Veatch has estimated plant performance for the three options to be as shown in Table 7-5. 21 March 2005 7-12 Black & Veatch G Ash for reuse
Kaua’i Island Utility Cooperative Renewable Energy Technology Assessments 7.0 Biomass and Municipal Solid Waste Table 7-5. Comparison of Plant Performance for Biomass and MSW Options. Performance Standalone Biomass Standalone MSW Combined Option B Gross Plant Output, kW 22,496 8,337 31,698 Aux Power, kW 2,500 1,046 3,880 Net Plant Output, kW 19,996 7,291 27,818 Fuel Burn Rate, MBtu/hr (HHV) 307.9 136.7 480.5 Gross Turbine Heat Rate, Btu/kWh 10,059 12,048 11,143 Steam Conditions, °F, psia 950, 1265 750, 615 750, 615 Net Plant Heat Rate, Btu/kWh 15,397 18,744 17,274 7.5.2 Operating Profile It has been assumed that the plant will export power at its design rating when operational. In general it has been assumed that the availability of the power plant would be 70 percent for MSW and 80 percent for biomass. Black & Veatch has assumed that for each flow-line there would be an annual shut of 2 to 3 weeks duration. This extended shutdown would allow the replacement or reconditioning of major items of plant such as boiler tubing etc. The balance of hours lost during the year would be unscheduled downtime. 7.6 Cost of Energy 7.6.1 Capital Cost The estimates of capital cost for each of the three options are summarized in Table 7-6. 21 March 2005 7-13 Black & Veatch
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Principal Investigators: Ryan Pletk
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