论文部分内容阅读
前言 埋地热输管线在试运阶段,管线温度突然大幅度升高,发生热胀现象。因为弯管的柔性较大和管线受土壤约束,弯管两侧直管的热胀量向弯管集中,使弯管及其附近直管产生很显著的变形和承受很严重的内力(弯矩、轴力和剪力)。在比较不严重的情况下,弯管及其附近直管的截面由元形变成椭元形,使管线不能通球,影响扫线清蜡;管线长期结蜡后,输送油品量将严重下降。在严重的情况下,弯管附近甚至产生裂缝,发生泄漏油气事故,造成仃输。影响生产。因此,合理的设计热输管线具有很重要的意义。
Preface Buried heat pipeline in the trial phase, the pipeline suddenly increased substantially in temperature, the phenomenon of thermal expansion occurred. Because of the greater flexibility of the elbow and the constraint of the soil by the soil, the thermal expansion of the straight pipe on both sides of the elbow is concentrated towards the elbows, causing significant deformation and severe internal forces (bending moment, Axial force and shear force). In less serious cases, the elbow and the straight pipe near the cross-section from the metamorphosed into an oval, the pipeline can not pass the ball, affecting the sweep line clear wax; pipeline long-term wax, the delivery of oil will be serious decline. In severe cases, even near the elbow cracks, oil and gas leaks, resulting in Ding lose. affect production. Therefore, a reasonable design of heat transfer pipeline has a very important significance.