Device and method for monitoring leakage of multiple parallel-buried natural gas pipelines

Abstract

The invention discloses a device and method for monitoring the leakage of multiple parallel-buried natural gas pipelines. The device comprises a pressure stabilization vacuum pump, a flow meter, a methane detector, a first vacuum electromagnetic valve, a second vacuum electromagnetic valve, a third vacuum electromagnetic valve, a fourth vacuum electromagnetic valve, a fifth vacuum electromagnetic valve, a modulation semiconductor laser, a laser drive unit, a gas detection tube, a photoelectric receiving processing unit and a filter. If the leakage of the natural gas pipelines occurs, leaked gas enters the gas detection tube, gas leakage is detected by the photoelectric receiving processing unit, a signal is transmitted to a PLC so that the concentration of natural gas can be calculated, the PLC starts to time, the vacuum electromagnetic valve of the leaking pipeline is opened, other vacuum electromagnetic valves are closed, the pressure stabilization vacuum pump is started, the natural gas permeating through the gas detection tube flows through the methane detector, the PLC stops timing, collected data are processed and analyzed, a photoelectric alarm is given according to a set procedure, and leakage monitoring for the first time is achieved. The device for monitoring the leakage of the multiple parallel-buried natural gas pipelines is convenient to operate, simple in structure, high in flexibility and long in service life.

Description

technical field [0001] The invention belongs to the field of oil and gas safety engineering, in particular to a device and method for monitoring the leakage of complex buried natural gas pipelines. Background technique [0002] Natural gas is a dangerous chemical, flammable and explosive, with an explosion limit of 5% to 15%. If natural gas leaks, it will easily form an explosive gas, which will cause an explosion when it encounters an open flame; therefore, natural gas pipeline leakage monitoring and location As a technology to ensure the safe operation of pipelines, technology has been paid more and more attention; with the gradual expansion of China's natural gas pipeline network and the increasing operating life, pipeline leakage accidents caused by corrosion, aging, third-party damage and other reasons continue to occur, and pipeline leakage not only pollutes The environment, the waste of resources, and the safety of people's lives and property are all huge threats; the...

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Problems solved by technology

[0006] The above-mentioned technology is in an outdoor environment when detecting leaks, which is extremely vulnerable to environmental changes (such as atmospheric turbulence, weather changes, and ambient temperature changes), and has poor anti-interference ability, and the equipment is easily damaged outdoors, which makes the detection accuracy and equipment The service life is greatly reduced; and the laser irradiation range is limited, if the natural gas is not exposed to the laser for some reason, the occurrence of leakage cannot be detected

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