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Effect of secondary air on NO emission in a 440 t/h circulating fluidized bed boiler based on CPFD method

Particuology 2023年第12期83卷 18-31页

作者： Hongpeng Liu Haiwen Sun Ye Bi Chunxia Jia Lei Zhang Yanlong Li Hong Qin Qing Wang Engineering Research Centre of Oil Shale Comprehensive Utilization Ministry of EducationSchool of Energy and Power EngineeringNortheast Electric Power UniversityJilin132012China Department of Chemical&Biological Engineering University of British ColumbiaVancouverV6T1Z3Canada Northeast Branch of Huadian Electric Power Research Institute Co. LtdShenyang110000China

The 440 t/h circulating fluidized bed boiler was numerically simulated by the computational Particle Fluid dynamics(CPFD)*** combustion characteristics of circulating fluidized bed boiler and the effect of secondary air on NO emission were *** full-scale three-dimensional model of a 440 t/h circulating fluidized bed boiler was *** rationality of the grid was validated by the experimental data of material layer *** accuracy of the simulation was validated by measuring the temperature of each measuring point in the dense phase *** combustion conditions in the furnace under different setting modes were *** effects of secondary air rates on NO formation in fluidized bed were *** results show that when the secondary air rate increases to 27%,the proper secondary air rate has a positive effect on the inhibition of NO generation,and the proper strengthening of the central air supply will improve the permeability of the secondary air and make the combustion more uniform and *** the secondary air rate increases to 33%,excessive improvement of air classification and central air distribution will affect the stability of circulating fluidized bed ***,air classification and strengthening of central air supply can be used together to inhibit the generation of NO.

关键词： Circulatingfluidized bed Low nitrogen combustion computational particlefluid dynamics (CPFD) Numerical simulation Secondary air

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