CPFD modeling of hydrodynamics,combustion and NOx emissions in an industrial CFB boiler

作     者：Jian Chang Xinrui Ma Xin Wang Xiaohang Li Jian Chang;Xinrui Ma;Xin Wang;Xiaohang Li

作者机构：School of EnergyPower and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China Bluestar(Beijing)Chemical Machinery Co.LtdBeijing100176China 

出 版 物：《Particuology》 (颗粒学报(英文版))

年 卷 期：2023年第81卷第10期

页      面：174-188页

核心收录：

学科分类：080703[工学-动力机械及工程] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The authors acknowledge the support from the National Natural Science Foundation of China(grant No.22178095)。 

主　　题：Hydrodynamics Combustion NOx emission CFB boiler CPFD 

摘      要：The ultra-low NOx emission requirement(50 mg/m^(3))brings great challenge to CFB boilers in China.To further tap the NOx abatement potential,full understanding the fundamentals behind CFB boilers is needed.To achieve this,a comprehensive CPFD model is established and verified;gas-solid flow,combustion,and NOx emission behavior in an industrial CFB boiler are elaborated;influences of primary air volume and coal particle size on furnace performance are evaluated.Simulation results indicate that there exists a typical core-annular flow structure in the boiler furnace.Furnace temperature is highest in the bottom dense-phase zone(about 950℃)and decreases gradually along the furnace height.Oxygen-deficient combustion results in high CO concentration and strong reducing atmosphere in the lower furnace.NOx concentration gradually increases in the bottom furnace,reaches maximum at the elevation of secondary air inlet,and then decreases slightly in the upper furnace.Appropriate decreasing the primary air volume and coal particle size would increase the CO concentration and intensify the in-furnace reducing atmosphere,which favors for NOx reduction and low NOx emission from CFB boilers.