综合管廊内高参数蒸汽管道应力分析及优化

Stress Analysis and Optimization of High Parameter Steam Pipeline in the Utility Tunnel

本文对综合管廊热力舱断面尺寸为4m×6m、管径为DN500的高参数蒸汽管道,利用Start-Prof软件进行了应力计算,并对补偿器设置方案进行了优化设计。驻点(节点O)二次应力、热胀应力范围比均随着管道补偿距离的减小而减小,且为线性关系。垂直设置的π型补偿,上部弯头安装工况应力小于下部弯头。随着补偿距离的增加,上、下部弯头应力也随之增加,且下部弯头应力增加更为显著。固定点轴向推力随着补偿距离的增加而增加。固定点径向推力先是随着补偿距离的增加而增加;随后固定点径向推力达到峰值,而后,固定点径向推力随着补偿距离增加而减小。π型补偿器热胀力随着补偿距离的减小而减小。

Start-Prof software was used to calculate the stress of the high parameter pipeline.The compensator setting scheme was optimized in the utility tunnel with cross-section size of 4m×6m,and the steam pipe is DN500.Both secondary stress at stagnation point(node O)and thermal expansion stress range ratio decrease with the decrease of pipeline compensation distance,and the relationship is linear.Vertically mounted compensator,the stress of the upper elbow is less than that of the lower elbow.With the increase of compensation distance,the stress of upper and lower elbow also increases,and the stress of lower elbow increases more significantly.The axial thrust of the fixed point increases with the compensation distance.The radial thrust at the fixed point increases with the compensation distance. Then the radial thrust at the fixed point reaches the peak. Then,the radial thrust at the fixed point decreases with the decreasing of the compensation distance and the influence of thermal expansion force of the compensator.