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EPA Combined Heat and Power Partnership Biomass CHP Catalog Figure 7-1. Kettle Falls Plant Schematic Source: Appel Consultants, Inc., 2000. The Kettle Falls schematic shows the configuration for a biomass-fueled power plant using a fixed bed stoker boiler and a condensing steam turbine for power production. The balance of plant includes the fuel prep-yard, cooling tower, pumps, condenser, de-aerator, cyclone and electrostatic precipitator, and the stack. A CHP configuration would include an extraction-condensing turbine with a steam extraction point for process steam or a back-pressure steam turbine. Power output is maximized with a condensing turbine. Maximum available process steam (with power production) would result from the use of a back-pressure turbine. Intermediate levels of power and steam can be achieved using an extraction-condensing turbine. In large CHP systems such as those used in pulp and paper mills, there might be more than one extraction point to serve the needs of different process requirements. 7.1.1 Fixed Bed Stoker Boiler CHP Configurations and Performance Fixed bed stoker boilers represent a commonly used option for a direct-fired biomass CHP system. The energy requirements and outputs for three sizes of stoker boiler systems from 100 to 900 tons/day are shown in Table 7-3. The table provides biomass feedstock requirements, typical feedstock characteristics, boiler biomass conversion efficiency, boiler output steam conditions as developed in Chapter 5, and power and process steam outputs for various power generation and steam production configurations. The power and steam configurations range from back-pressure steam turbines, various extraction turbine configurations, and power-only condensing turbine configurations. For this analysis, all process steam for the CHP systems is assumed to be required at 150 psig (saturated), except for the small 100 tons/day system, which supplies 15 psig saturated steam to process. 7. Representative Biomass CHP System Cost 80 and Performance ProfilesPDF Image | Biomass Combined Heat and Power Catalog of Technologies
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