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by Stanisław Wasilewski Strata Mechanics Institute of the Polish Academy of Sciences, Krakow, Poland AGH University of S

A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERS AT THE LONGWALL FACE DURING THE SHEARER OPERATION by Stanisław Wasilewski Strata Mechanics Institute of the Polish Academy of Sciences, Krakow, Poland AGH University of Science and Technology, Krakow Poland

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by Stanisław Wasilewski Strata Mechanics Institute of the Polish Academy of Sciences, Krakow, Poland AGH University of S

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  1. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERS AT THE LONGWALL FACE DURING THE SHEARER OPERATION by Stanisław Wasilewski Strata Mechanics Institute of the Polish Academy of Sciences, Krakow, PolandAGH University of Science and Technology, Krakow Poland Marian Branny AGH University of Science and Technology, Krakow Poland The 12th U.S./North American Mine Ventilation Symposium Reno University, June 9-11, 2008, Reno, Nevada, USA

  2. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION • Introduction • Experiment at longwall B-5 • experiment place • experiment conditions • Registration of air parameters at longwall B-5 • Experiment results discussion • Summary

  3. p1 p1 Dp Dp p2 p2 A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION v v Effects of obstructions in the cross-section of the airways

  4. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION • Introduction • Experiment at longwall B-5 • experiment place • experiment conditions • Registration of air parameters at longwall B-5 • Experiment results discussion • Summary

  5. Longwall B-4 Q=1360 m3/min Q=2700 m3/min gate B4 Longwall B-5 transport ramp Q=1240 m3/min gate B5 Q=2900 m3/min Q=300 m3/min transport ramp Q=900 m3/min gate B6 gate Cw3 gate B6 transport ramp gate Cw4 Q=1100 m3/min gate B7 gate B7 A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION Diagram of the area of longwall B-5

  6. beltconveyor scraperconveyor v=0,9 m/s v=1,89 m/s Q=1360 m3/min v=2 m/s shearer v=0,02÷0,04 m/s v=1,69 m/s Q=1240 m3/min A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION 945 m longwall B5 250 m The experiment was done on 13.07.2006 from 8:00 to 11:00 hrs Technological and raw coal haulage parameters at longwall B-5

  7. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION • Introduction • Experiment at longwall B-5 • experiment place • experiment conditions • Registration of air parameters at longwall B-5 • Experiment results discussion • Summary

  8. Longwall B-4 P1 P3 MM47 gate B4 Longwall B-5 P4 P9 AS349 MM11 MM30 P5 AS458 MM48 transport ramp AS341 AS463 P7 MM12 P8 MM44 MM49 gate B5 MM50 transport ramp gate B6 gate Cw3 gate B6 barometric pressure µBar metanometers anemometers transport ramp P gate Cw4 MM gate B7 AS gate B7 A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION Diagram of the area of longwall B-5together with the site of installation of basic and additional sensors of the monitoring system

  9. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION Barometric pressures in the area of longwall B-5 during experiment

  10. MM12 MM47 MM48 MM11 AS463 MM49 P4 P5 P3 ZONE B ZONE A ZONE C A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION P5-P4 P4-P3 P5-P3 Diagram of sensors’ distribution at longwall B-5 during the experiment on 13.07.2005

  11. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION • Introduction • Experiment at longwall B-5 • experiment place • experiment conditions • Registration of air parameters at longwall B-5 • Experiment results discussion • Summary

  12. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION Pressure drops in the area of longwall B-5

  13. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION Air velocity in the area of longwall B-5

  14. Length 13 m Anemometer A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION The shearer dimensions approximately 1,5×1,5 = 2,25m2,. It was roughly 30% of the active cross-section of the longwall (S = 6,5m2) Air velocity at longwall B-5

  15. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION Air velocity at longwall B-5

  16. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION Saturday and Sunday (brake in coal winning) Air velocity at longwall B-5

  17. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION Methane concentration at longwall B-5

  18. A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION Summary • Absolute pressures registered in the area of the longwall show considerable changeability. During coal winning and movement of a shearer in longwall evident effects of pressure changes were observed. • Movement of a shearer in longwall have an impact upon temporary and local disturbances of airflow what was registered by an anemometer installed at the longwall. Large dimensions of machines used in heavy duty longwalls, asa mobile obstacle limiting the corss-section of the longwallduring coal winning process, createsa local increase in air velocity. • During coal winning in a longwall one can observe methane concentration increase at sequent methanometers alongside the longwall in conformity with direction of airflow. At the same time one can see the effect of convection of methane in the airflow direction. • The investigations have confirmed that disturbances of ventilation conditions induced by movement of a shearer have a local character. Emission of methane caused by coal winning has an essential influence on formation of methane concentration distribution in the longwall.

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