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Brief Process Summary
The AgriPower unit is a "open" Brayton Cycle - a turbine using air as the working fluid which is heated via heat exchangers coupled with a fluid-bed combustor. The benefits of this system are 1) less turbine maintenance because of air working fluid, 2) fuel flexibility because combustor and turbine are closed systems, 3) small size can be modularized, and 4) utilizes biomass.
The AgriPower is a 225 Kw externally fired gas turbine with a fluid bed combustor and supplemental diesel fired in-line combustor on the turbine inlet. There are two primary flow circuits in the process: a compressed air turbine circuit and a combustion circuit. The compressed air turbine circuit begins with the intake of ambient air by the compressor, which is powered by a direct connection to the turbine. The air is compressed to several atmospheres and passes through a recuperator which transfers heat from the turbine exhaust to the compressed air. The compressed air passes through convective and radiant heat exchangers, recovering energy, and powering the turbine. The turbine exhaust then passes through the recuperator and is either discharged to the atmosphere or utilized for cogeneration. Biomass fuel is supplied to the furnace by a feed hopper and screw conveyors.
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