考虑倾覆力矩影响的回转式空气预热器主轴强度分析

Main Shaft Strength Analysis of Rotary Air Preheater Considering the Influence of Overturning Moment

以某660 MW机组回转式空气预热器为研究对象,采用弯扭合成当量弯矩方法对回转式空气预热器主轴截面进行应力计算和强度校核。结果表明:相较于其他工况,在BMCR工况下回转式空气预热器主轴所受的倾覆力矩达到最大,产生的弯曲应力在合成应力中占比52%,是影响主轴弯曲变形的重要因素;相较于不考虑倾覆力矩影响的情况,考虑倾覆力矩后主轴强度的安全裕度降低了40%。

Taking the rotary air preheater of a 660 MW unit as the research object,the stress calculation and strength check of the dangerous section of the main shaft for the rotary air preheater were carried out using the method of bending and torsion synthesis equivalent bending moment.Results show that when the rotary air preheater operates under BMCR conditions,the overturning moment of the main shaft reaches the maximum and the bending stress accounts for 52%of the total synthesis stress,which is an important factor affecting the bending deformation of the main shaft.Compared with the situation without considering the influence of overturning moment,the safety margin of the main shaft is reduced by 40%after considering the over turning moment.