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A new overfire air (OFA) technology was proposed by the authors for a Foster Wheeler down-fired boiler, and a small-scale cold experimental system for a 660-MWe unit was established. The velocity field distribution was measured in the furnace to study the characteristics of single-phase flow in the furnace at different OFA nozzle angles. The furnace temperature and distributions of the O2 concentration...
In situ measurements on a down-fired pulverized-coal 350 MW e utility boiler revealed that, aside from particularly high NO x emissions, an asymmetric combustion phenomenon characterized by gas temperatures near the front wall being clearly higher than those near the rear wall, had developed in the furnace. A deflected flow field, obtained by cold airflow experiments within a small-scale...
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