Simulation and experiment of gas leakage and dispersion in complex topography

Key words:  gas leakage  numerical simulation  CFD  experiment  tracer gas

Abstract:

Aiming at the problem of gas leakage and dispersion in complex terrain, a CFD-based gas leakage and dispersion numerical simulation model in complex terrain was proposed. The gas distribution on the ground and variation of tracer gas concentration of monitoring points with time were estimated. The effects of terrain, wind direction and wind speed on gas dispersion were obtained. Taking SF6 as tracer gas，a gas release experiment was carried out in mountain gas gathering station.The colored smoke generator was taken as a tool to determine the arrangement of the sampling points. The electronic time-controlled air sampler and gas chromatography-electron capture detection method were used for sample collection and sample analysis, respectively, which could measure the concentration of tracer gas in sampling points at different time. The results of SF6 release experiment show that the experimental program is reasonable and has wide applicability. The model can effectively reduce the number of sampling points, improve the effectiveness of sampling data，and implement the test data acquisition and analysis. The contrast between simulation results and experiment results illustrates the validity of numerical model in handling gas leakage and dispersion in complex mountainous terrain.