NOx emission and thermal efficiency of a 300Â MWe utility boiler retrofitted by air staging

Sen Li, Tongmo Xu, Shien Hui and Xiaolin Wei

Applied Energy, 2009, vol. 86, issue 9, 1797-1803

Abstract: Full-scale experiments were performed on a 300Â MWe utility boiler retrofitted with air staging. In order to improve boiler thermal efficiency and to reduce NOx emission, the influencing factors including the overall excessive air ratio, the secondary air distribution pattern, the damper openings of CCOFA and SOFA, and pulverized coal fineness were investigated. Through comprehensive combustion adjustment, NOx emission decreased 182Â ppm (NOx reduction efficiency was 44%), and boiler heat efficiency merely decreased 0.21%. After combustion improvement, high efficiency and low NOx emission was achieved in the utility coal-fired boiler retrofitted with air staging, and the unburned carbon in ash can maintain at a desired level where the utilization of fly-ash as byproducts was not influenced.

Keywords: NOx; emission; Boiler; thermal; efficiency; CCOFA; SOFA (search for similar items in EconPapers)
Date: 2009
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Citations: View citations in EconPapers (34)

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