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根据单相介质受热管在泄漏工况下的传热传质机理，将一根过热器单管简化为两个集中参数受热管环节与一个分流环节的串联，给出了过热器单管工质泄漏故障的数学模型。该模型适用于对一类工质微量泄漏影响问题的分析研究。仿真结果表明：１）过热器单管泄漏对泄漏点后的金属管壁温度有较强的影响；２）随着泄漏量的增大，金属管壁的温度也呈升高趋势，且其升高速度与泄漏量的增加成正比，金属管壁温度的变化同时受泄漏点位置和泄漏量的影响，但泄漏量的影响是主要的因素；３）随着泄漏量的增加，金属管壁温度的上升时间缩短
According to the heat and mass transfer mechanism of the single-phase heat-medium tube under the leakage condition, a single superheater tube is simplified into two series-connected heat pipe sections and one shunt section, and the single-tube superheater working medium Mathematical model of leakage fault. The model is suitable for the analysis of the impact of a class of minor leakage of working fluid. The simulation results show that: 1) the superheater single-tube leakage has a strong influence on the temperature of the metal pipe wall after the leakage point; 2) the temperature of the metal pipe wall also increases with the increase of the leakage amount, The high speed is proportional to the increase of leakage. The change of metal tube wall temperature is affected by the location of leakage point and the amount of leakage, but the influence of leakage is the main factor. 3) With the increase of leakage, the temperature of metal tube wall The rise time is shortened