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Studies have been conducted to develop a fixed granular-bed sorber for the removal of alkali vapors in a pressurized fluidized-bed combustion (PFBC) combined-cycle system. A laboratory-scale pressurized alkali-vapor sorption test unit was used to characterize activated bauxite, the most effective sorbent identified earlier, for its alkali vapor sorption capability in a gas stream with temperature (≤900°C), pressure (10 atm absolute), and composition closely simulating the actual PFBC flue gas. A scale-up of laboratory tests is being conducted in a 15.2-cm-dia (6-in.-dia) PFBC system to demonstrate the granular-bed sorber concept. The NaCl-vapor sorption chemistry of activated bauxite is described. The extent of alkali-vapor evolution from the activated bauxite bed itself is discussed, along with an evaluation of the significance of its alkali vapor contribution to a downstream gas turbine. Details of the design of a high-temperature/high-pressure alkali sorber system for the demonstration of the sorber are presented.

The adoption of coal-fired pressurized fluidized-bedThese include conventional and augmented cyclones; combined-cycle combustion systems by utilities for porous metal, fabric, and ceramic membrane filters; electric power generation depends to a large extent on the fixed-, continuously moving-, and fluidized-bed development of an efficient and economic cleanup system granular filters; electrostatic precipitators; as well as between the combustor and gas turbine. To accomplish several other novel separation devices. The results of tests particulate removal from a dust-laden gas stream, a of these devices are discussed in relation to pressurized number of separation devices have been developed. fluidized-bed combustion applications.

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