失效20G高压炉管热应力数值模拟

Numerical Simulations for Thermal-stress of Failure Tubes of High-pressure Boiler

炉管是注汽锅炉重要的换热元件,它的安全运行意义重大。由于炉膛内温度分布不均匀,当瞬时温差较大时炉管局部会产生较大热应力。本文从热应力的角度对高压锅炉管爆管原因进行分析。通过Ansys建立20G炉管裂纹模型,对50~350℃不同温差产生的热应力进行模拟。通过分析得出：热应力会加剧材料局部损伤,并且是导致爆管的重要因素。

Boiler tube is an important component of boiler furnaces.The temperature is not well-distributed in the furnace,which can cause bigger regional heat stress.In this paper,tubes explosion of boiler were analyzed from the angle of thermal stress.Cracks model of 20G tubes was established by Ansys.Thermal stress caused by temperature difference in the range of 50 ℃~350 ℃ was numerically simulated.The results show that the thermal stress can aggravate local damage of tubes,and is the most important factor to cause tubes explosion.