Abstract
The authors investigate a new concept in the design of fluidized bed combustors that improves load turndown capability. This design is based on control of heat-transfer rate independent of combustion rate. The configuration under investigation consists of a central combustion bed surrounded by an annular fluidized bed that establishes overall heat-transfer rate from the inner combustion bed. The two beds are fluidized independently by separate air plenums. Experiments were performed to evaluate the usefulness of this device in improving load turndown. For a given combustor firing rate and air-to-fuel ratio, a wide variation in combustion temperature could be achieved by controlling the flow of fluidization air to the annular fluidized bed. In other tests, a load turndown ratio of 8.7 was achieved while combustion temperature was held constant.
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