燃气管道腐蚀分级评价理论研究

发布时间：2018-06-30 08:04

  本文选题：燃气管道 + 分级评价　； 参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：地下燃气管道与供水、排水管道等共同构成城市地下公共管网系统,为城市输送清洁能源。燃气管道一旦腐蚀失效,必然导致燃气泄漏,泄漏的天然气在一定条件下会引发火灾、爆炸等危险事故,造成人员、财产损失。管道失效产生的停运和事故后修复也会影响人民正常生活。为了保证燃气管道能够安全运营,系统可靠的燃气管道评价体系尤为重要。本文开展的工作和取得的成果主要有:(1)建立了燃气管道腐蚀程度分级模型。将影响燃气管道腐蚀的因素分为五个一级指标和七个二级指标,采用改进综合层次分析法,输入因素监测等级和因素权重,计算出管道腐蚀程度等级,结果更符合管道实际情况。(2)建立了燃气管道腐蚀事故严重性分级模型。输入管道腐蚀失效孔尺寸及管道直径、内压等参数,计算火球、喷射火、云爆炸的损失半径,根据人口密度和财产密度计算损失后果。结果表明:当燃气管道仅有一处泄漏时,云爆炸和火球的事故后果明显大于喷射火事故,管道内压显著影响事故等级。(3)建立了燃气管道腐蚀事故连锁效应模型。可根据腐蚀源管道直径、目标管道直径和管道间距数据,计算连锁效应概率。通过算例分析了管径比和管道净距对连锁效应的影响。结果表明:连锁效应的概率随着两管道距离的增加而减小,当管道净距大于4倍半径和时,连锁效应明显变小;源管道半径小于目标管道半径时,连锁效应更明显。(4)对比了多种腐蚀后管道安全压力计算方法在不同腐蚀长度、腐蚀深度及管材钢级下的差异,结果表明DNV-RP-F101有效应力法更稳定。(5)编制了燃气管道腐蚀分级评价软件。以燃气管道评价理论为核心进行了软件的编辑和开发,为燃气管道腐蚀分级评价提供了高效实用的评价工具。
[Abstract]:Underground gas pipeline, water supply, drainage pipe and so on constitute the urban underground public pipe network system, conveying clean energy for the city. Once the gas pipeline corrodes and fails, it will inevitably lead to gas leakage. Under certain conditions, the leaked natural gas will lead to fire, explosion and other dangerous accidents, resulting in loss of personnel and property. Failure of pipelines and post-accident repair will also affect the normal life of the people. In order to ensure the safe operation of gas pipeline, a reliable evaluation system of gas pipeline is very important. The main achievements of this paper are as follows: (1) the classification model of corrosion degree of gas pipeline is established. The factors affecting corrosion of gas pipeline are divided into five first class indexes and seven second grade indexes. The corrosion degree of pipeline is calculated by using improved comprehensive analytic hierarchy process (AHP), input factor monitoring grade and factor weight. The results are more in line with the actual situation of pipeline. (2) the severity classification model of gas pipeline corrosion accident is established. The size of corrosion failure hole and pipe diameter and internal pressure are input to calculate the loss radius of fireball, jet fire and cloud explosion, and the loss consequence is calculated according to population density and property density. The results show that when there is only one leakage in the gas pipeline, the consequences of cloud explosion and fireball accidents are obviously greater than those of jet fire accidents, and the internal pressure of the pipeline significantly affects the accident grade. (3) the cascading effect model of gas pipeline corrosion accidents is established. The probability of cascading effect can be calculated according to the diameter of corrosion source pipe, the diameter of target pipe and the distance between pipes. The influence of diameter ratio and net distance of pipe on the linkage effect is analyzed by an example. The results show that the probability of the linkage effect decreases with the increase of the distance between the two pipelines. When the net distance of the pipeline is greater than 4 times the radius of the pipeline, the linkage effect becomes smaller, and the radius of the source pipeline is smaller than the radius of the target pipeline. The linkage effect is more obvious. (4) the difference of different calculation methods of pipeline safety pressure under different corrosion length, corrosion depth and pipe steel grade after corrosion is compared. The results show that the effective stress method of DNV-RP-F101 is more stable. (5) the evaluation software for corrosion grading of gas pipeline is developed. Based on the theory of gas pipeline evaluation, the software is edited and developed, which provides an efficient and practical evaluation tool for gas pipeline corrosion grading evaluation.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU996
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本文编号：2085592