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泡沫清管器过盈量计算及其对清管效果影响
刘建林,徐香玲,程永桂,张云
(中国石油大学(华东)储运与建筑工程学院,山东青岛 266580)
摘要:
在对管道进行清理的过程中,清管器与管道内壁之间实现过盈配合而产生接触力,因此过盈量的设计对两者之间的接触力及清管效果具有重要影响。针对清管器-管道结构,分别建立平面应变模型、平面应力模型及空间轴对称模型,求解得到相互作用力与过盈量之间的函数关系。考虑实际工程应用,在过盈量确定条件下,采用有限元对管道内壁存在污垢的情况进行模拟,展示3种具有不同过盈量清管器的清洗效果。将3种力学模型所得到的结果与有限元模拟结果进行对比。结果表明:平面应力模型、空间轴对称模型和数值模拟得到的结果非常接近,比平面应变模型更加符合工程实际,在此基础上,结合实际工程中所用参数,通过力学平衡方程,可以得到清管器运动所需的推动力与过盈量之间的函数关系;对工程中常用的管材钢和泡沫聚氨酯材料相配合的清管系统进行过盈量求解,发现其过盈量一般在2%~5%,符合工程实际需求。3种具有不同过盈量清管器的清洗效果说明若要得到较佳的除垢效果则需要合理设计过盈量。
关键词:  泡沫清管器  过盈量计算  平面模型  空间轴对称模型  清管效果
DOI:10.3969/j.issn.1673-5005.2021.02.013
分类号::O 39
文献标识码:A
基金项目:
Interference calculation of foam pigging and its effect on pigging effect
LIU Jianlin, XU Xiangling, CHENG Yonggui, ZHANG Yun
(College of Pipeline and Civil Engineering in China University of Petroleum(East China), Qingdao 266580, China)
Abstract:
In the process of pipeline cleaning, the interference fit between the pig and the inner wall of the pipeline leads to the contact force, and therefore the design of interference has a very important impact on the contact force and pigging effect. Aiming at the pig-pipeline structure, the plane strain model, plane stress model and axisymmetric model in space are respectively established, and the function of the contact load with respect to the interference is given. Under the condition that the interference value is determined in practical engineering, the finite element simulation (FEM) is performed to demonstrate the situation that there is dirt on the inner wall of the pipeline, and the cleaning results of three kinds of pigs with different interference values are displayed. Based on the results from the three mechanics models and the FEM results, it is judged that the plane stress model, the axisymmetric model in space and the FEM model are in excellent agreement, which are more in line with the engineering practice than the plane strain model. Moreover, combined with the parameters used in practical engineering, the function of the driving force with respect to the interference is obtained in the light of the mechanical balance equation. The interference values of pigging systems that normally include iron pipes and foam polyurethane materials in engineering are solved. It is found that the interference is generally in the range of 2%-5%, which is consistent with the practical demand of engineering. This finding shows that it is necessary to design the interference value reasonably in order to obtain the optimal removal effect of the pipe.
Key words:  foam pig  interference calculation  plane model  axisymmetric model in space  pigging effect
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