CAJ | 학술논문

大型汽轮发电机定子环形引线在不当的安装操作下容易引发汽堵故障堵塞水路，造成引线损毁甚至引发停机事故。该文针对具体事故案例，基于计算流体力学方法，建立引线及其冷却水的流固耦合共轭传热仿真模型，计算两起事故外接连通管错误接法下环形引线及其冷却水的温度场，分析温度特征与水路堵塞程度之间的对应关系。计算及分析结果表明，外接连通管错接后冷却水流量过低是导致汽堵故障的直接原因，汽堵发生后约半小时通风不良处的引线开始熔断。在此基础上，提出严格按照说明安装水路水管及加装温度与流量监测装置的预防和改进措施。
대형기륜발전궤정자배형인선재불당적안장조작하용역인발기도고장도새수로，조성인선손훼심지인발정궤사고。해문침대구체사고안례，기우계산류체역학방법，건립인선급기냉각수적류고우합공액전열방진모형，계산량기사고외접련통관착오접법하배형인선급기냉각수적온도장，분석온도특정여수로도새정도지간적대응관계。계산급분석결과표명，외접련통관착접후냉각수류량과저시도치기도고장적직접원인，기도발생후약반소시통풍불량처적인선개시용단。재차기출상，제출엄격안조설명안장수로수관급가장온도여류량감측장치적예방화개진조시。
Steam blockage faults inside the circular lead of large turbogenerators, which initiated by some installation mistakes, will burn the lead and cause a non-normal shutdown accident. According to specific fault cases, the conjugate heat transfer model of the lead and its cooling water was constructed in this pa-per, based on the computational fluid dynamics. Thermal field of the lead and its water under a wrong re-turn pipe connection was calculated, and then the relationship between temperature characteristics and the degree of blockage was analyzed. The calculation and analysis results indicated that, the abnormal low flow rate caused by a wrong return pipe connection was the direct reason of steam blockage. The lead began to melt about 30 min after the formation of steam blockage. On this basis, this paper suggests a normative installation and extra thermal and flow monitor devices to prevent faults.