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Numerical simulation method in gas pipeline explosion venting process

A numerical simulation, gas pipeline technology, applied in the field of gas pipeline explosion venting, can solve the problems of inability to analyze gas pipeline explosion venting, not fully considering hydrogen deflagration to detonation and its suppression process, etc., to increase the effective area of ​​​​the flame and increase the disturbance , the effect of improving accuracy

Pending Publication Date: 2021-12-21
CHANGZHOU UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the risk assessment of gas pipelines under geological disasters mostly focuses on the vulnerability of gas pipelines caused by geological disasters and the hazards of geological disasters to gas pipelines. Although these methods can effectively evaluate the impact of gas pipelines on geological disasters, However, due to the lack of full consideration of the deflagration-to-detonation and suppression process of hydrogen in the gas pipeline, the explosion process of the hydrogen-air mixture in a single obstacle pipeline and the problem of multi-stage explosion venting, it is impossible to accurately vent the gas pipeline explosion. Comprehensive analysis

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  • Numerical simulation method in gas pipeline explosion venting process
  • Numerical simulation method in gas pipeline explosion venting process
  • Numerical simulation method in gas pipeline explosion venting process

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Experimental program
Comparison scheme
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Embodiment

[0032] refer to figure 1 , a numerical simulation method in the gas pipeline explosion venting process, comprising the following steps:

[0033] S1. The establishment of the model. The gas venting process is a process of rapid combustion reaction, which satisfies the mass conservation, momentum conservation, energy conservation and chemical composition balance equations, and establishes the basic model on this basis;

[0034] S2. Calculation area and condition setting, carry out numerical simulation to the gas explosion experiment, respectively carry out the explosion venting of a single explosion vent and the explosion venting of two explosion vents;

[0035] S3, simulation results and analysis, the numerical simulation results are compared with the gas explosion test data;

[0036] S4, draw conclusions: 1) the position of explosion vent has important influence on the deflagration-to-detonation process of the hydrogen-air mixture in the pipeline, when the explosion vent is l...

Embodiment 1

[0047] The simulation operation of the gas explosion experiment can be simplified as an axisymmetric model of the spherical container and the explosion venting duct. The inner diameter of the spherical explosion venting container is 350mm; the inner diameter of the explosion venting duct is 50mm, and the length is 165mm; The inside is filled with methane and air mixed according to the stoichiometric ratio, and the outside of the container is air; assuming that the center of the container encounters an ignition source and explodes, the ignition temperature is 2000K, and 10% of the fuel in the ignition area is consumed at the instant of ignition.

[0048] In step S2, the position of the explosion vent in the explosion venting of the single explosion vent is 0.4, 1.6, and 2.0m from the ignition end. The limitation of the venting area and venting rate of the blast vent failed to prevent the occurrence of detonation. At the same time, due to the existence of the blast vent, the dist...

Embodiment 2

[0052] The simulation operation of the gas explosion experiment can also use a closed circular tube with a length of 4m and an inner diameter of 0.106m as the explosion vessel. One end is ignited, and there is an annular obstacle with a blocking ratio of 0.92 and an inner diameter opening of 0.03m at a distance of 1m from the ignition end. A pressure sensor is set every 0.5m to monitor the pressure change after the obstacle is installed, and the establishment of the physical model is completely consistent with the experimental device.

[0053] In step S2, the position of the explosion vent in the explosion venting of the single explosion vent is 0.4, 1.6, and 2.0m from the ignition end. The limitation of the venting area and venting rate of the blast vent failed to prevent the occurrence of detonation. At the same time, due to the existence of the blast vent, the disturbance of the gas in the pipeline was increased, turbulent flow was generated, and the effective area of ​​the ...

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Abstract

The invention belongs to the technical field of gas pipeline explosion venting, and particularly relates to a numerical simulation method in a gas pipeline explosion venting process, which comprises the following steps: establishing a model, namely establishing a basic model on the basis that the gas explosion venting process is a rapid combustion reaction process and meets mass conservation, momentum conservation, energy conservation and chemical component equilibrium equations; setting a calculation area and conditions, carrying out numerical simulation on a gas explosion experiment, and respectively carrying out explosion venting of a single explosion venting port and explosion venting of two explosion venting ports; analyzing a simulation result, and comparing a numerical simulation result with gas explosion test data; obtaining the conclusion that the position of the explosion venting opening has important influence on the detonation-to-detonation conversion process of the hydrogen-air mixture in the pipeline. According to the invention, a mode of combining multiple models is adopted in the numerical simulation process, numerical simulation is carried out on the conditions of a single explosion venting opening and two explosion venting openings, the influence of different numbers of explosion venting openings on the explosion venting process is determined, and a corresponding conclusion is obtained.

Description

technical field [0001] The invention relates to the technical field of explosion venting of gas pipes, in particular to a numerical simulation method in the process of venting gas pipes. Background technique [0002] In our country, frequent geological disasters are very destructive and destructive to urban public infrastructure facilities. Urban gas pipelines have a certain pressure, and the transmission medium is flammable and explosive. Once geological disasters cause soil movement and surface deformation, buried pipelines can be deformed or broken under the action of soil, resulting in gas leakage. Gas leakage can easily cause casualties and property damage, so it is necessary to evaluate the explosion risk of gas pipeline leakage when geological disasters occur. [0003] In the prior art, the risk assessment of gas pipelines under geological disasters mostly focuses on the vulnerability of gas pipelines caused by geological disasters and the hazards of geological disas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F30/18G06F111/10G06F113/14G06F119/14
CPCG06F30/20G06F30/18G06F2111/10G06F2119/14G06F2113/14
Inventor 黄勇耿冰冰
Owner CHANGZHOU UNIV
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