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Experimental study on foam coverage on simulated longwall roof.

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  • 1Research mining engineer, associate service fellow, mining engineer, mechanical engineer and research engineer, respectively, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health (CDC-NIOSH), Pittsburgh Mining Research Division, Pittsburgh, PA, USA.

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Summary
This summary is machine-generated.

Foam application on longwall mining roofs shows promise for dust control. Agent A foam, especially with compressed air, demonstrated superior roof coverage and longevity in simulated mining conditions.

Keywords:
Dust controlFoam coverageLongwall roof

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Area of Science:

  • Mining Engineering
  • Dust Control Technology
  • Material Science

Background:

  • Respirable coal mine dust, a significant health hazard, is partly generated by longwall shield movement.
  • Effective dust control methods for longwall mining operations are crucial for worker safety.

Purpose of the Study:

  • To evaluate the efficacy of foam agents in maintaining roof coverage within a simulated longwall mining environment.
  • To assess foam's potential as a dust control strategy for longwall shield operations.

Main Methods:

  • Laboratory testing of two foam agents (A and B) using compressed air and blower air generation methods.
  • Simulated longwall face roof application under 3.3 m/s ventilation velocity.
  • Quantifiable analysis of foam coverage and integrity over time using advanced imaging and ImageJ software.

Main Results:

  • Compressed air foam showed higher initial and 30-minute retention rates for Agent A (98% and 94%) compared to Agent B (95% and 20%).
  • Blower air foam retention varied by nozzle, with Agent A remaining at 74-92% and Agent B at 3-50% after 30 minutes.
  • Agent A generally outperformed Agent B in roof adhesion and longevity, particularly with compressed air application.

Conclusions:

  • Foam application is a feasible dust control method for longwall mining roofs.
  • Foam can withstand typical face ventilation velocities, indicating potential for reducing dust from longwall shield movement.
  • Compressed air foam offers better duration and ease of application, while blower air foam retains more water, suggesting different optimal uses.