Numerical Optimization Research on the Internal Flow Field of the Primary Air Passage at the Inlet of the Coal Mill in Large Thermal Power Units
In this paper,the primary air duct at the inlet of a large coal mill in a domestic thermal power unit is taken as the research ob-ject,and the flow field optimization design of the air duct is carried out in view of the measuring misalignment problem of the inlet air vol-ume of the mill.First of all,according to the existing layout of the primary air duct at the inlet of the mill,an optimal design scheme com-bining the overall layout optimization with the addition of mixing partition board and deflector plate is given.Then,the effect of the opti-mized scheme of primary air duct at the inlet of coal mill is verified by numerical calculation method.The numerical simulation results show that the velocity uniformity coefficient and temperature uniformity coefficient at the inlet air volume measurement section of the mill are sig-nificantly improved after the optimization scheme is adopted,which indicates that the optimization scheme significantly improves the internal flow characteristics of the primary air duct at the inlet of the mill,and thus achieves remarkable optimization effect.
Coal millPrimary air ductNumerical calculationFlow field optimizationUniformity
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