%0 Journal Article
%T Numerical Study on NOx Emissions of Methane Re-Combustion in a 600 MWe Coal-Fired Boiler
%A Xiaotao Zhang
%A Hussain Ahmad Madni Gondal
%A Foyuan Duan
%A Weidong Zhang
%A Haoliang Mu
%A Chengyu Zhang
%A Aijun Wang
%J Energy and Power Engineering
%P 101-107
%@ 1947-3818
%D 2020
%I Scientific Research Publishing
%R 10.4236/epe.2020.123008
%X The fuel staging combustion technology is a promising low NOx combustion technology for coal-fired boiler. In order to reduce NOx emissions, the burners of a 600<span style=\"font-family:Verdana;\"> </span><span style=\"font-family:Verdana;\">MWe coal-fired boiler are retrofitted in which methane gas is selected as a secondary fuel for re-combustion. The CFD models of combustion process are built to investigate</span><span style=\"font-family:Verdana;\"> </span><span style=\"font-family:Verdana;\">effects of the methane gasratio on combustion process and NOx emissions. A total of 4 cases are numerically studied, including the pure coal combustion case, the coal combustion with 7.5%, 10%, 12.5% of methane gas re-combustion cases respectively. The results show that the re-combustion of methane can reduce the temperature at primary combustion zone, but increase the temperatures at the re-combustion area and the furnace outlet. The NOx concentration at the furnace outlet reduces with the increasing methane gas ratio.</span><span style=\"font-family:Verdana;\"> </span><span style=\"font-family:Verdana;\">Methane re-combustion can greatly benefit to the NOx emissions reduction.</span>
%K Numerical Simulation
%K Re-Combustion
%K NOx Emission Reduction
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=99172