Forecasts of methane concentration at the outlet of the longwall with caving area - case study

The Role of Polish Coal in the National and European Energy Sector

Badura, Henryk^1 ; Baka, Piotr^1 ; Musiol, Dariusz^1 ; Wesolowski, Marek^1

Faculty of Mining and Geology, Silesian University of Technology, Akademicka 2, Gliwice

44-100, Poland^1

关键词: Air flow-rate;    Caving area;    Forecasting models;    Measured values;    Methane concentrations;    Methane content;    Methane flow;    Telemetric systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/268/1/012016/pdf
DOI  :  10.1088/1757-899X/268/1/012016

来源: IOP

【 摘 要 】

This paper presents the characteristics of methane hazard and prevention undertaken in the N-6 longwall of seam 330/2 in "Krupiski» coal mine. On the basis of methane concentration measurements conducted with the use of telemetric system, time series of the average and maximum methane concentration at the outlet of the longwall area were generated. It was ascertained that they exhibit a strong autocorrelation. Based on a series of the average methane concentration, a time series of ventilation methane content was created and a total methane content was calculated with the use of methane flow rate measurements in the demethanization system. It was ascertained that dependence between methane concentration and output on the examined day and on the previous day is weak and also that the dependence between methane concentration and air flow rate is very weak. Dependencies between ventilation methane content, total methane content and demethanization efficiency were also investigated. Based on forecasting models [1] developed earlier by H. Badura, forecasts have been made to predict the average and maximum methane concentrations. The measured values f methane concentration show a high level of accordance with forecasted ones.