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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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slide1

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

slide2

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
slide3

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

slide4

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
slide5

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

slide6

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

slide7

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
slide8

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

slide9

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

slide10

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

slide11

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
slide12

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

slide13

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

slide14

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

slide15

A PRELIMINARY STUDY OF THE UNSTEADY STATES

OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION

Air velocity at longwall B-5

slide16

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

slide17

A PRELIMINARY STUDY OF THE UNSTEADY STATES

OF THE VENTILATION PARAMETERSAT THE LONGWALL FACE DURING THE SHEARER OPERATION

Methane concentration at longwall B-5

slide18

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.