Test device and method for simulating natural gas leakage in soil

Abstract

The invention provides a test device and method for simulating natural gas leakage in soil. The test device comprises a compressed gas steel cylinder, a pressure reducing valve, a gas flow meter, a PC computer, a pressure-tolerant hose, a rigid pipe, a gas buffer cylinder, a combustible gas probe, a multichannel combustible gas probe controller, a waterproof shield cable, a rigid hose and the like. The gas buffer cylinder and the combustible gas probe are embedded in outdoor soil. Through the rigid hose, zero calibration can be carried out on the combustible gas probe buried in the ground. The test method comprises the steps that the pressure reducing valve of the compressed gas steel cylinder of natural gas is opened; the gas buffer cylinder is filled with the natural gas successively through the gas flow meter, the pressure-tolerant hose and the rigid pipe; the combustible gas probe buried in the ground is used to collect the concentration of the gas leaking out from the gas buffer cylinder; the diffusion law of the natural gas in soil after natural gas pipe leakage is researched; and a technical support is provided for the prevention and the disposition of a natural gas pipe leakage accident.

Description

technical field [0001] The invention relates to a test device and method for simulating the leakage of natural gas in soil, and relates to the technical fields of measurement of combustible gas, gas diffusion in porous media, gas pipeline system and the like. Background technique [0002] As of 2005, the length of various pipelines built in the world has exceeded 2.5 million kilometers, and its total length has exceeded the total mileage of world railways. Most of the natural gas in the world, and more than 85% of crude oil transportation is realized through pipeline transportation. . As of early 2013, the total length of oil and gas pipelines in China has exceeded 100,000 kilometers. However, like all engineering equipment, accidents can happen to pipelines. With the continuous development of the pipeline transportation industry, the increase of the number of pipelines, the increase of the age of the pipeline, and the inevitable corrosion, wear, defect and other natural o...

AI Technical Summary

Problems solved by technology

The above two articles first used indoor full-scale experimental devices, which did not fully conform to the actual application background; second, the two articles did not use gas buffer cylinders, which could not simulate the size and direction of the real pressure gradient near the leak hole; The two articles cannot perform online calibration on combustible gas probes. Combustible gas buried in the soil for a long time will have zero point and concentration drift, and the detected concentration will have a large error

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