Biomass Combined Heat and Power Catalog of Technologies

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Biomass Combined Heat and Power Catalog of Technologies ( biomass-combined-heat-and-power-catalog-technologies )

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EPA Combined Heat and Power Partnership Biomass CHP Catalog 7.2 Biomass Gasification Systems Gasification systems are more complicated than direct combustion, but they allow the use of more efficient power production. Gasification systems can use combined-cycle power plants based on gas turbines and also steam turbines that use recovered heat from the gas turbine exhaust in the form of steam. Four gasification systems of varying sizes are compared in this section: • A 100-tons/day atmospheric gasification system that uses efficient reciprocating IC engines to generate power and hot water. At this size range, engines are more efficient than small gas turbines and are preferable if the thermal energy can be utilized as hot water or low-pressure steam. In addition, the engines are capable of using the low-pressure syngas with additional compression. • 250 and 452 tons/day atmospheric gasification systems producing power and steam in a gas turbine combined-cycle configuration. Significant energy is required to compress the low- pressure syngas. In addition, standard gas turbines are designed to compress a larger quantity of air than is needed for this low-Btu application. Figure 7-3 shows a schematic representation of a direct-fired atmospheric gasification system. The combined-cycle system is based on the Solar Turbines Steam Turbine Assisted Cogeneration configuration in which the gas turbine and the steam turbine are at opposite ends of the same drive shaft powering a single generator. • A 1,215-tons/day pressurized gasification system with an aeroderivative gas turbine in combined-cycle configuration—the pressurized gasifier eliminates the need for syngas compression before introduction into the gas turbine. Air extracted from the gas turbine compression stage is used to compress the air introduced into the gasifier for partial oxidation. Figure 7-4 shows a schematic of this type of system. 7. Representative Biomass CHP System Cost 89 and Performance Profiles

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