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Combustion Characteristics of Coal-Fired Boiler Depending on the Variations in Combustion Air Supply Method  

Seo, San-Il (Korea Electric Power Research Institute, KEPCO)
Park, Ho-Young (Korea Electric Power Research Institute, KEPCO)
Kang, Dong-Soo (Young Heung Power Station, KOSEP)
Jeong, Dong-Hae (Young Heung Power Station, KOSEP)
Publication Information
Journal of Energy Engineering / v.19, no.3, 2010 , pp. 156-162 More about this Journal
Abstract
3-D CFD(Computational Fluid Dynamics) work were carried out to investigate the combustion characteristics in a boiler depending on the variations in air supply condition. For the gas temperature, $O_2$, NO, SOx at the outlet of economizer, the predicted values were been compared with the measured data. With the verified CFD model, the effects of air flow rates through SOFA(Separated Over Fire Air) and CCOFA(Closed Coupled Over Fire Air) on the combustion behavior in a boiler were simulated, and the distributions of NOx and gas temperature were mainly compared each other. The change in SOFA air flow rate gave the more sensitive effect on NOx than that in CCOFA. The distributions of gas temperature at convection path are differed with the changes in SOFA and CCOFA flow rate, so the combustion modification such as yaw anlge adjustment are required to get an enhanced gas temperature distribution.
Keywords
Coal combustion; NOx Emission; Yaw angle; Furnace; Superheater;
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