The Reduction of NOx in the Fluidized Bed Sewage Sludge Incinerator (II):Pilot-Plant Experiment

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Experiments were carried out in order to reduce NOx emission with a 600mmφ/900mmφ sectioned fluidized bed sewage sludge incinerator based on Raschka's technique in West Germany. This paper presents the effects of the staged combustion technique for NOx reduction applied to the fluidized bed incinerator. In the operation, the fluidized bed was maintained at the less-stoichiometric condition and the rest of the combustion air, the secondary air, was introduced into the free-board. We examined four kinds of the injection method of the secondary air. First one is no secondary air. Second one is the single staged injection just above the bed. Third one is the uniform supply from the five staged nozzles, and last one is the delayed injection from upper three nozzles attached to the freeboard. The experimental results showed that the NOx emission was appreciably reduced by applying the multi-staged injection of the secondary air in comparison with both the no-injection and the single stage which are the conventional operation. Especially, the three staged injection method is the most effctive, and makes NOx emission less than 60ppm.
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