The Reducing Ambience Analysis under the Low Nitrogen Mode Operation of a Boiler

Abstract

Abstract In 2014, the electricity industry boilers are required to meet the ultra-low emissions standard. Specifically, the dust, SO2, NOx are required to reach 5, 35, 50 mg/m3, respectively. Hence, the boiler operated under lean oxygen will be widely and long-term existed. In this paper, the distributions of velocity, temperature and flue gas composition were simulated under different air distribution modes. The numerical simulations demonstrated that both the CO and H2S contents in the major burner zone increased with the SOFA rate increasing. However, there is almost no CO and H2S in the burnout zone due to the increase of SOFA. Besides, as the SOFA rate increasing, NO in the burnout zone slightly increased, but the NO in the main combustion zone significantly reduced.