大型火电机组磨煤机入口一次风道内部流场数值优化研究
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
韩磊 1陈得胜 2高国栋2
作者信息
- 1. 沈鼓集团股份有限公司,辽宁沈阳 110869
- 2. 西安热工研究院有限公司,陕西西安 710054
- 折叠
摘要
本文以国内某大型火电机组磨煤机入口一次风道为研究对象,针对磨煤机入口风量测量失准问题,开展了风道流场优化设计.首先,根据现有磨煤机入口一次风道布置情况,给出采用整体布局优化和内部增设掺混分区板、导流板相结合的优化设计方案;然后,运用数值计算方法,对磨煤机入口一次风道优化方案的效果进行了验证.数值仿真结果表明,采用优化方案后,磨煤机入口风量测量截面的速度均匀性系数和温度均匀性系数均有显著的提升,这说明优化方案显著提升了磨煤机入口 一次风道的内流特性,进而取得了显著的优化效果.
Abstract
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.
关键词
磨煤机/一次风道/数值计算/流场优化/均匀性Key words
Coal mill/Primary air duct/Numerical calculation/Flow field optimization/Uniformity引用本文复制引用
出版年
2024
NETL
NSTL
万方数据