A system and method for monitoring and controlling natural gas pipelines in urban comprehensive utility corridors

Abstract

The invention discloses a urban comprehensive pipe rack natural gas pipe monitoring control system and method. The system comprises a film, an air pipe, a fixing device, film section bearing transition devices, infrared alarms, intake fans, exhaust fans, and a methane concentration sensor; a film is supported on the outer side of a natural pipe through multiple film section bearing transition devices, and the bottom is fixed on the ground through the fixing device to form a closed film channel; air pipes are arranged on two sides of the film channel; multiple intake fans are arranged along oneair pipe, and multiple exhaust fans are arranged along the other air pipe; the intake fan at the starting end and the exhaust fan at the tail part communicate with the film channel, so that air in the film channel is circulated; the methane concentration sensor is arranged in the exhaust fan at the tail part for detecting the concentration of methane in the film; and the infrared alarms are arranged at the tops of the film section bearing transition devices for detecting the expansion degree of the film to determine if the methane leakage occurs. The system can monitor if the natural gas pipeis leaked in real time, and can accurately and quickly position to timely exhaust leaked gas.

Description

technical field [0001] The invention relates to an intelligent detection technology, in particular to a monitoring and control system and method for a natural gas pipeline of an urban comprehensive utility gallery. Background technique [0002] Gas pipelines generally use seamless steel pipes. Rigid pipelines are prone to rupture during construction and other processes. Once ruptured, a large amount of flammable gas accumulated in the underground space will become a major danger to public safety. After the gas pipeline enters the corridor, each pipeline in the comprehensive pipeline corridor will be placed in its own place, and the frequency of pipeline rupture accidents caused by various constructions will be greatly reduced. , will catch fire and cause an explosion, which will cause danger to the main body of the comprehensive utility corridor, the roads on it, and the surrounding active citizens. Therefore, it is necessary to monitor and control the combustible gas in th...

AI Technical Summary

Problems solved by technology

The first two monitoring methods are difficult to monitor methane gas leakage away from the entrance and exit. In addition, when the leakage is small, it may not be detected within the accuracy range of the methane gas detector.

The third monitoring method involves flow / pressure changes, mass / volume balance and pressure point analysis, which cannot adapt to changing operating conditions

More importantly, these monitoring methods only serve the purpose of monitoring and cannot rule out the risk of leakage.

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