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Partitioning characteristics of gas channel of coal-rock mass in mining space and gas orientation method

International Journal of Mining Science and Technology 2013年第6期23卷 873-877页

作者： Zhao Zhiqiang Ma Nianjie Jia Housheng Cheng Yuanping School of Resource and Safety Engineering China University of Mining&Technology National Engineering Research Center for Coal gas Control China University of Mining&Technology

In order to research the influence of coal-rock mass morphology of mining space on the flow law of gas,the laboratory physical model and numerical computation methods were adopted to simulate coal mining *** simulation results indicate that,after coal seam mining,the loose rock accumulation body of free caving,ordered rock arrangement body of plate damage rich in longitudinal and transverse fractures and horizontal fissure body formed by rock mass deformation imbalance are formed from bottom to top in the mining *** these three types of accumulation bodies,there are essential differences in the accumulation state,rock size and gas breakover *** to this,the coal-rock mass in the mining space is classified into gas turbulence channel area,gas transitional flow channel area and gas seepage channel *** the turbulence channel area,the gas is distributed transversely and longitudinally and gas diffuses in the form of convection with Reynolds number R_e more than100;in the transitional flow channel area,one-way or two-way gas channels are crisscross and gas is of transitional flow regime with R,.between 10 and *** the seepage channel area,there are a few vertical gas channels with R,.less than *** this paper,the researches on the gas orientation method in different partitions were further carried out,gas orientation methods of low-level pipe burying,middle-level interception and high-level extraction were determined and an on-site industrial test was conducted,achieving the effective diversion of gas and verifying the reasonableness of gas channel partition.

关键词： gas channel Partitioning characteristics gas flow regime gas orientation method

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Calculation of Steady SF_6 gas flow through a 420 kV Circuit Breaker Nozzle and Electric Field Distribution

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Journal of Energy and Power Engineering 2014年第11期8卷 1964-1973页

作者： Dejan Beslija Sead Delic Kyong-Hoe Kim Mirsad Kapetanovic Almir Ahmethodzic Faculty of Electrical Engineering University of Sarajevo Sarajevo 71000 Bosnia and Herzegovina EnergoBos ILJIN d. o. o. Sarajevo 71000 Bosnia and Herzegovina ILJIN Electric Co. Ltd. Seoul 121-716 Republic of Korea

Special interest in current interruptions is dedicated to the processes close to the current zero instant, the so-called interaction region, which determines the circuit breakers＇ performance. The quantities of interest in this region are the distribution of temperature, density and pressure, velocity and gas mass flow along the electric arc axis, as well as the distribution of electric stress between contacts Calculation of steady SF_6 gas flow through the nozzle of a 420 kV circuit breaker at the current zero instant, for different arcing durations, was carried out using a commercial CFD （computational fluid dynamics） simulation tool. The calculation results were used to get insight into improvement possibilities of the SF_6 gas flow model used in the software for computer simulation of HV （high-voltage） circuit breakers. Electric field calculation results were performed for the same 420 kV circuit breaker, in order to estimate the breakdown voltage at the current zero instant.

关键词： HV SF_6 circuit breaker nozzle gas flow regime shock wave breakdown voltage.

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