锅炉主蒸汽管道蠕变非线性有限元分析

对长期处于高温高压状态下运行的管道而言,高温蠕变是其寿命损耗的主要内在因素、本文以一余热锅炉主蒸汽管道为研究对象,建立了该管道蠕变有限元模型,研究和分析了该主汽管在高温蠕变作用下的应力分布规律,探讨了管道内输送流体的压力和温度与其蠕变量的关系。结果表明,当温度超过490℃时或压力达到10MPa时蠕变较为明显。

High temperature creep is a main inner factor of life losses of the pipe under the action of high temperature and high pressure for a long term. The main steam pipe of a heat recovery boiler is studied and the finite element model of the pipe creep is established. Then, the stress distribution of the main steam pipe under the action of high temperature creep is analyzed and the relation between the pressure and temperature of the conveyance fluid inside the pipe and the creep magnitude is discussed. The results show that the creep is obvious when the temperature is over 490℃ or the pressure is up to 10MPa.