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针对某电厂锅炉顶棚过热器频繁爆管现象,建立了与现场实际相同的几何模型,采用计算流体动力学方法对联箱内部流动情况进行数值研究。研究发现联箱三通附近由于静压分布异常,导致引入管周边的分支管静压较低,流量分配相对减少,发生传热恶化,进而发生爆管。该文提出优化的几何结构,通过对特定分支管引出方向进行调整,显著提升了并联分支管流量分配的均匀性,为电站锅炉分配联箱设计和结构优化提供一定的参考。
Aiming at the frequent squib of boiler superheater in a power plant, the same geometrical model as the actual field was established, and the computational fluid dynamics method was used to study the internal flow in the header. The study found that due to the abnormal distribution of static pressure near the header tee, the branch pipe around the introduction pipe has a lower static pressure, a relatively lower flow distribution, a worsened heat transfer, and a burst pipe explosion. In this paper, an optimized geometric structure is proposed. By adjusting the leading direction of a particular branch pipe, the uniformity of the flow distribution of the parallel branch pipe is significantly improved, providing a reference for the design and structural optimization of boiler distribution header.