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Summary:A flue gas conditioning system features a self-contained sulfur burner control loop 43 that operates to maintain a constant desired temperature supply of sulfur dioxide in air by varying the rate of supply of sulfur fuel 41 to the sulfur burner 42, and the absence of device in the sulfur flow path to measure or monitor sulfur flow rate. In some embodiments, a flue gas conditioning agent demand control apparatus 39 is incorporated into the system for controlling a flow of conditioning agent based on a signal determined from a rate of discharge of a charged electrode of the electrostatic precipitator. Also, in some embodiments, Figures 9 to 20, the system uses a catalytic converter movable between an operative position where the flue gas flows through one or more converters to convert SO* subscript minus * contained in the flue gas to SO* superscript dot; dot above * when conditioning agent is needed and an inoperative position where the flue gas does not flow through the catalyst when conditioning agent is no longer needed.
Bibliography:Application Number: GB19930007158