基于接触摩擦特性的清管器清洁能力评价方法

基于三维有限元数值模拟方法,从密封元件的接触摩擦特性出发,创新性地提出一种清管器清洁能力评价方法。利用ANSYS软件建立两种常见形式的清管器在水平直管内运行的三维有限元模型,并通过现场试验对其准确性进行验证。通过分析计算结果,分别对不同摩擦工况下的两种清管器的清洁能力进行对比。研究结果表明:接触摩擦因数对清管器在运行过程中的密封紧密度、切向刮擦力、有效清洁面积均存在影响,随着摩擦因数的增加,清管器密封元件的切向刮擦力增大,而接触紧密度和接触面积减小。在相同摩擦工况下,当密封元件材料和过盈量相同时,直板型清管器的密封紧密度和刮擦力均优于皮碗型清管器;然而在运行相同距离的情况下,皮碗型清管器所能产生的有效清洁面积大于直板型清管器。根据待清洁管道内的杂质类型来合理选择清管器种类可以有效发挥其清洁能力,提高清洁效率。

An evaluation method of pig cleaning capacity based on contact friction characteristics

Based on the three-dimensional finite element numerical simulation, an evaluation method of pig cleaning capacity was innovatively proposed from the perspective of the contact friction characteristics of the sealing component. Three-dimensional finite element models were established for two kinds of typical pigs running in horizontal straight pipeline with ANSYS, and the accuracy of the models was verified by field tests. Further, the cleaning capacity of the two kinds of pigs under different friction conditions were compared respectively through analysis on the calculation results. The research results show that the contact friction coefficient can affect the sealing tightness, tangent scraping force and effective cleaning area of running pigs. The scraping force increases with the increasing of friction coefficient while the sealing tightness and the contact area decrease. If the material and interference of the sealing components are identical under the same friction condition, the sealing tightness and the scraping force of the straight plate pig are superior to those of cup pig. However, the effective cleaning area of the cup pig is larger than that of the straight plate pig with same running distance. Appropriate pig should be selected according to the type of impurity in the pipeline to be cleaned, so that the cleaning capacity and efficiency can be improved effectively.