China Safety Science Journal ›› 2019, Vol. 29 ›› Issue (9): 43-50.doi: 10.16265/j.cnki.issn1003-3033.2019.09.007

• Safety Systematology • Previous Articles     Next Articles

Study on natural gas leakage and diffusion in utility tunnels and optimization of monitoring methods

HE Leping1, TANG Shuang1, HU Qijun1, CAI Qijie2, SHI Rendan3   

  1. 1 School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu Sichuan 610500, China;
    2 School of Transportation and Logistics, Southwest Jiaotong University, Chengdu Sichuan 610031, China;
    3 Deyang Natural Resources and Planning Bureau, Deyang Sichuan 618000, Chin
  • Received:2019-06-10 Revised:2019-08-09 Online:2019-09-28 Published:2020-10-30

Abstract: In order to determine locations of CH4 sensors in utility tunnels so as to improve safety of gas transportation in natural gas compartments, a three-dimensional CFD model was built to study CH4 leakage and diffusion under factors of pipeline pressure grade, leakage aperture, leakage angle, ventilation speed, ventilation temperature and section type. The results show that CH4 diffusion rises to utility top and then migrates down to compartment bottom along with increase of longitudinal diffusion length under comprehensive factors. CH4 sensors should be placed on walls that are much closer to pipes if the pipe is not in the center of compartment or installed on either side of the wall when it is at the center. And sensors should be 0.6-1.6 m high above gas release source.

Key words: utility tunnel, natural gas pipe, leakage diffusion, CH4 sensor, computational fluid dynamics(CFD)numerical simulation

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