Numerical Study on NOx Emissions of Methane Re-Combustion in a 600 MWe Coal-Fired Boiler

作     者：Xiaotao Zhang Hussain Ahmad Madni Gondal Foyuan Duan Weidong Zhang Haoliang Mu Chengyu Zhang Aijun Wang 

作者机构：Departments of Electric Power North China University of Water Resources and Electric Power Zhengzhou China 

出 版 物：《Energy and Power Engineering》 (能源与动力工程（英文）)

年 卷 期：2020年第12卷第3期

页      面：101-107页

学科分类：080702[工学-热能工程] 08[工学] 0807[工学-动力工程及工程热物理] 

主　　题：Numerical Simulation Re-Combustion NOx Emission Reduction 

摘      要：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?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?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.?Methane re-combustion can greatly benefit to the NOx emissions reduction.