Stanislaw Wasilewski

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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF THE
VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION

• by
• Stanislaw 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
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT 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

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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION
v
v
Effects of obstructions in the cross-section of
the airways
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT 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

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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION
Diagram of the area of longwall B-5
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION
945 m
longwall B5
250 m
The experiment was done on 13.07.2006 from 800
to 1100 hrs
Technological and raw coal haulage parameters at
longwall B-5
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT 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

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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION
Diagram of the area of longwall B-5 together with
the site of installation of basic and additional
sensors of the monitoring system
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION
Barometric pressures in the area of longwall B-5
during experiment
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT 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
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT 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

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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION
Pressure drops in the area of longwall B-5
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION
Air velocity in the area of longwall B-5
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION
The shearer dimensions approximately 1,51,5
2,25 m2,. It was roughly 30 of the active
cross-section of the longwall (S 6,5 m2)
Air velocity at longwall B-5
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION
Air velocity at longwall B-5
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION
Saturday and Sunday (brake in coal winning)
Air velocity at longwall B-5
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT THE LONGWALL FACE
DURING THE SHEARER OPERATION
Methane concentration at longwall B-5
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A PRELIMINARY STUDY OF THE UNSTEADY STATES OF
THE VENTILATION PARAMETERS AT 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, as a mobile obstacle
  limiting the corss-section of the longwall during
  coal winning process, creates a 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.