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管道内壁附着物厚度的状况,是工业生产安全性评价的一项重要指标.以有机热载体炉为例,其管道内壁的积碳层极易造成加热炉管的某些部位局部过热,导致爆管发生,造成人员伤亡.本文分析L(0,2)模态在双层管道中的传播特性后提出,利用110k Hz下L(0,2)模态导波的群速度随管道内壁附着物厚度增长单调减小的特性,无损定量地检测外径57mm,壁厚3.5mm管道的内壁均匀附着物的厚度.随后建立了管道内壁附着物厚度定量检测系统,利用中心频率为110k Hz的压电斜探头以非对称加载的方式对内壁附着有0、1、1.5、2和2.5mm均匀模拟积碳的管道试样进行了35组实验研究.实验结果表明,L(0,2)模态群速度的实验值与理论值的总体变化趋势保持了一致.利用本方法可以定量检测管道内壁附着物的厚度,对安放空间狭小、无法沿管道周向布置阵列传感器的工业管道的检测具有很好的实用意义,并且对于后续的探头开发具有指导意义.
Thickness of the pipe wall attachment status is an important indicator of industrial production safety evaluation to organic heat carrier furnace, for example, the inner wall of the carbon deposition layer can easily lead to some parts of the furnace tube overheating, leading to explosion After the propagation of L (0,2) modal in double-layer pipelines, the velocity of L (0,2) mode guided wave at 110k Hz is analyzed with the propagation of the L The monotonous decrease of the thickness increases, and the thickness of the uniform adhesion on the inner wall of the pipeline with an outer diameter of 57 mm and the thickness of 3.5 mm is detected without any damage. A quantitative measuring system for the thickness of the adhesion of the inner wall of the pipeline is established, An oblique probe was used to conduct 35 groups of experiments on asymmetrically loaded pipe samples with 0, 1, 1.5, 2 and 2.5 mm uniform coke deposition on the inner wall.The experimental results show that the L (0,2) mode group The experimental results of the velocity are consistent with the general trend of the theoretical value.The method can quantitatively measure the thickness of the pipe wall attachment and has good performance for the detection of industrial pipes with small installation space and no array sensor along the pipe circumference practical Righteousness, and has significance for the subsequent development of the probe.