直埋管道预热安装的安全性研究  

Security research on preheating installation of directly buried pipe

作　　者：王飞[1] 王国伟[1] 孙刚[2] 吴华新[2] 

机构地区：[1]太原理工大学环境科学与工程学院,山西太原030024 [2]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001

出　　处：《材料科学与工艺》2009年第2期203-207,共5页Materials Science and Technology

摘　　要：针对大口径、高温、高压直埋管道采用冷安装可能发生局部屈曲,但是预热安装在冷水运行、或降温等过程中又发生管道断裂、补偿器撕裂等严重事故.通过分析管道承压能力、径向稳定性、局部屈曲、管道拉伸断裂等条件,得出最小壁厚及其理想条件下的预热下限温度和上限温度关系式,并考虑施工过程可能产生的应力、管材特性及其缺陷的影响,提出计算结果的修正系数.得出了重要结论:预热温度不仅和热媒温度变化有关,也和热媒压力、管道壁厚、管基性质、施工质量、管材特性等有关.当系统温度和压力确定后,有一最小壁厚以及对应这一壁厚的预热温度范围.把预热温度控制在这一区间的预热安装,供热管道是安全的,同时也可节约大量钢材和显著降低预热能耗.Local buckling may happen when directly buried pipes with large diameter, high temperature and pressure adopt cold installation. When preheated installation is operated in cold water or during the cooling process, it will lead to serious accidents such as pipeline rupture, compensator fracture and so on. Based on analyses of conditions like pipeline pressure resistance, radial stability, local buckling and pipeline tensile fracture, the present study works out minimum wall thickness and the function formula of lowest and highest temperature limit for preheating under idealized conditions. The correction coefficient of calculation results is proposed with reference to the influence of the possible stress effect generated in construction, pipe characteristics and its defects. An important conclusion is drawn： the preheating temperature is not only related to the heating medium temperature variation, but also related to heating medium pressure, pipeline wall thickness, pipe bedding properties, construction quality, and pipe characteristics, etc. The minimum wall thickness and preheating temperature range corresponding to the wall thickness can be calculated when system temperature and pressure are defined. When preheating temperature is controlled in the temperature range, the heating - supply pipeline is in safe condition; in the meanwhile, a great deal of steel can be saved and preheating consumption can be reduced notably.

关 键 词：直埋管道 预热温度 管壁厚度 局部屈曲 径向失稳 

分 类 号：TU995[建筑科学—供热、供燃气、通风及空调工程]