CAJ | 학술논문

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。
침대모전엄과로정붕과열기빈번폭관현상，건립료여현장실제상동적궤하모형，채용계산류체동역학방법대련상내부류동정황진행수치연구。연구발현련상삼통부근유우정압분포이상，도치인입관주변적분지관정압교저，류량분배상대감소，발생전열악화，진이발생폭관。해문제출우화적궤하결구，통과대특정분지관인출방향진행조정，현저제승료병련분지관류량분배적균균성，위전참과로분배련상설계화결구우화제공일정적삼고。
Numerical simulation was performed on the internal flow of header using the method of computational fluid dynamics with geometry model builded the same as practical field for the frequent rupture of roof superheater in a power station. The results indicate that due to the abnormal static pressure distribution in the area of Tee-junction of header, the static pressure of the branch pipes around inlet tube is so low, and the mass flow rate decreases relatively, then the heat transferation of tubes deteriorates,finally the tubes rupture. This paper proposes an improved geometric construction. By changing the leading direction of specific branch pipes, the uniformity of mass flow distribution in branch pipes promotes significient. It will offer a great reference for further design and optimization of distribution header in power station boilers.