电站轴流引风机叶片通过频率振动超标问题机理分析及治理

在广泛调研及查阅文献的基础上，系统研究了国内燃煤发电机组轴流引风机在环保改造后普遍存在的叶片通过频率振动超标问题，通过以国内某电厂引风机叶片通过频率振动治理的典型案例为研究对象，对叶片通过频率振动超标现象的内在机理及治理过程进行了详细分析。研究结果表明，叶顶间隙均匀度、机壳圆度、叶片同步性、叶片形态一致性、叶轮平衡状态、出口烟道形式等多种因素均会对该振动问题产生影响。最后对不同原因引起的叶片通过频率超标问题给出了相应的治理方案。该研究结果及治理经验可用于治理电站轴流引风机叶片通过频率振动超标问题。

Mechanism Analysis and Treatment of Blade Passing Frequency Vibration for Axial Induced Draft Fans in Power Plant

Based on extensive investigation and literature review, this paper systematically explored the blade passing frequency problem in the axial induced draft fans with the vibration amplitude exceeding the related standards, which has occurred widely in coal-fired power plants after the environmental transformation project implemented. Through the studies on a typical case in a domestic plant, the internal mechanism and treatment processes are analyzed in details. The study result shows that blade tip clearance evenness, casing roundness, blade synchronicity, blade shape consistency, impeller balance, and export flue forms all contribute to this vibration. At last, the treatment plan corresponding to the various causes of the vibration are put forward respectively. The research results and management experience presented are applicable to the blade passing frequency vibration treatment for axial induced draft fans in power plants.