通过某电厂光管式改造成膜式省煤器的运行实践和流场实验结果，建立了膜片间烟气的速度场和飞灰场分布曲线及函数关系式，阐述了膜式省煤器管外烟气流场的特点，分析、论证了采用传统方法计算膜式省煤器磨损量使用寿命的缺陷，提出了较切合实际的建议，对今后膜式省煤器的设计及应用，具有参考价值 Through the operation practice and flow field experimental results of film-type economizer with light pipe retrofit of a power plant, the relationship between the velocity field of flue gas and the distribution curve and function of fly ash yard was established, and the characteristics of membrane economizer The characteristics of the flue gas flow field outside the pipe are analyzed and demonstrated. The defects of using the traditional method to calculate the service life of the film economizer are analyzed. Some practical suggestions are put forward. For the future design and application of membrane economizer, Reference value