高能管系中管段长度比与最大热应力的关系

RELATIONSHIP BETWEEN LENGTH RATIO OF PIPE SECTION AND MAXIMUM THERMAL STRESS IN HIGH TEMPERATURE PIPING SYSTEM

  • 摘要: 通过分析实际设计过程及高温管道中各应力分量的影响因素,发现管系的热应力大小主要由管系的走向和各管段的实际长度决定。由此,提出了管系管段长度比的概念。通过力法对管段长度和热应力进行分析发现:(1)管系相邻管段长度比越大,各种排布方式中最大的热应力越大;(2)以目前常用的P91管道为例,给定管系的实际尺寸和运行参数,得出了管系所允许的最小管段长度;(3)在管系最小管段长度确定的前提下,进一步得出管系所允许的最大管段长度比;(4)随着管段数目的增加,管系允许的最短管长趋近于某个确定值;(5)在管系最小管段长度确定的前提下,管系允许的最大管段长度比随着管段数目的增加有一个趋近值。

     

    Abstract: After analyzing the effects of the actual design procedure and the substantial influence factors on stresses in high-temperature pipeline, it is found that the thermal stresses of a pipeline are mainly dominated by the routing trend of the piping system and the actual length of each pipe segment. Therefore, this paper puts forward the concept of pipe length ratio. Using force method to analyze the effects of lengths of the pipe segments on thermal stresses in several typical piping patterns, following results have been found: (1) The larger the length ratio of adjacent pipe sections is, the greater the maximum value of thermal stress can be obtained corresponding to various piping arrangements; (2) taking P91 pipeline as an example, the minimum allowable pipe section length of a pipe system is obtained for the given pipe sizes and operation data; (3) the maximum length ratio of pipe system is obtained through determining the minimum length of a pipe system; (4) the shortest allowable pipe length of a pipe system approaches to an asymptotic value with the increase of the number of pipe sections; (5) when the minimum length of a pipe system is determined, the allowable maximum length ratios approaches to an asymptotic value with the increase of bends.

     

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