Numerical Simulation of Flow Field in the Coal Water Slurry-Fired Industrial Boiler with Different Turbulence Models
This paper presents numerical simulation of flow field in the oil-designed industrial heating boiler to fire coal water slurry (CWS). Four different turbulence models including standard, renomialization group (RNG), and realized k-ε model and Reynolds stress model (RSM) were used to study on the flow field. The effect of the swirling intensity of secondary air and the outlet angle of primary air and secondary air on the flow field was studied respectively. The results indicate that realized k-ε model and RSM can give a satisfactory estimation of the highly swirling flow field; Navier-Stokes equations with the RSM become stiffer than those with k-ε models, and the former convergence time is much longer compared with the latter; central recirculation zone (CRZ) initially enlarges and then reduces with the increase of the outlet angle of primary air, and it enlarges gradually with the increase of the outlet angle of secondary air and its swirling intensity; the axial velocity at the exit of swirling burners is distributed in M type, and the tangential velocity in N type; there exists CRZ near the exit area of every swirling burner. A suitable CWS swirling burner was designed, which provided stable burning and avoids slagging.
Numerical simulation Coal water slurry (CWS) Turbulence model Industrial boiler
Zhu Liujuan Gu Boqin Chen Ye
College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China
国际会议
北戴河
英文
425-429
2007-06-06（万方平台首次上网日期，不代表论文的发表时间）