Natural gas pipeline safety monitoring key technology based on acoustic pulse compression

Abstract

The invention relates to a natural gas pipeline safety monitoring key technology based on acoustic pulse compression, and belongs to the field of pipeline safety monitoring. The process comprises the following steps that a linear frequency modulation pulse acoustic wave signal is transmitted into a pipeline, a reflection signal is received by a sensor, and is transmitted to an upper computer through a data acquisition card for related data processing, wherein the data processing process comprises the following steps that firstly, matching filtering, envelope extraction and difference value calculation are performed on the collected signal firstly, and then the time difference between the transmission signal and the reflection signal in a difference value curve is calculated so that positioning of the hydrate blockage or the pipeline leakage can be realized. The natural gas pipeline safety monitoring key technology has the main advantages that the positioning precision is high, the real-time performance is good, the system monitoring range is wide, the spatial resolution is high, effective compression of the signal can be realized through the pulse compression technology, the contradiction between the system spatial resolution and the monitoring distance is solved, real-time dynamic monitoring of the hydrate generation process can be realized through the difference value algorithm, and severe noise pollution can be effectively inhibited through the matching filtering technology.

Description

technical field [0001] The invention relates to a key technology of natural gas pipeline safety monitoring based on acoustic pulse compression, which belongs to the field of pipeline safety monitoring. Background technique [0002] With the sustained and rapid development of the national economy, my country's demand for clean and high-quality energy, especially natural gas, is becoming more and more urgent. Due to the special medium of natural gas itself, especially in harsh environments, pipelines have become a suitable and stable mode of natural gas transportation and have attracted the attention of the whole society. However, under certain high pressure and low temperature conditions, natural gas pipelines are prone to blockage of hydrates, which seriously threatens the safety of pipelines, and pipeline leakage may also lead to serious life safety accidents and economic losses. Therefore, online monitoring and location of hydrate blockage and leakage in natural gas pipel...

AI Technical Summary

Problems solved by technology

However, this technology still has certain limitations. Since the excitation signal is a single-frequency sinusoidal signal, it is easily affected by noise. When the frequency of the excitation signal is within the noise spectrum range, the signal-to-noise ratio of the reflected signal is seriously reduced or even submerged by noise.

In addition, in the case of a fixed sound source power, in order to increase the detection distance, the width of the sound pulse needs to be increased to increase the average power of the signal, and the increase of the sound pulse width will lead to a decrease in spatial resolution and positioning accuracy

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