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Mining Publication: Comparison of the CAS-POL and IOM Samplers for Determining the Knockdown Efficiencies of Water Sprays on Float Coal Dust
Keywords: Coal dust Fire and explosion prevention Water sprays
Original creation date: March 2018
Authors: C Seaman, M Shahan, T Beck, S Mischler
Peer Reviewed Journal Article - March 2019
Go to Web Page
NIOSHTIC2 Number: 20050700
J Occup Environ Hyg 2018 Mar; 15(3):214-225
Float coal dust, generated by mining operations, is distributed throughout mine airways by ventilating air designed to purge gases and respirable dust. Float coal dust poses an explosion hazard in the event of a methane ignition. Current regulation requires the application of inert rock dust in areas subjected to float coal dust in order to mitigate the hazard. An alternate method using water sprays, which have been effective in controlling respirable dust hazards, has been proposed as a way to control float coal dust generated on longwall faces. However, the knockdown efficiency of the proposed water sprays on float coal dust needs to be verified. This study used gravimetric isokinetic Institute of Occupational Medicine (IOM) samplers alongside a real-time aerosol monitor (Cloud Aerosol Spectrometer with polarization; CAS-POL) to study the effects of spray type, operating pressure, and spray orientation on knockdown efficiencies for seven different water sprays. Because the CAS-POL has not been used to study mining dust, the CAS-POL measurements were validated with respect to the IOM samplers. This study found that the CAS-POL was able to resolve the same trends measured by the IOM samplers, while providing additional knockdown information for specific particle size ranges and locations in the test area. In addition, the CAS-POL data was not prone to the same process errors, which may occur due to the handling of the IOM filter media, and was able to provide a faster analysis of the data after testing. This study also determined that pressure was the leading design criteria influencing spray knockdown efficiency, with spray type also having some effect and orientation having little to no effect. The results of this study will be used to design future full-scale float coal dust capture tests involving multiple sprays, which will be evaluated using the CAS-POL.
First page of Comparison of the CAS-POL and IOM Samplers for Determining the Knockdown Efficiencies of Water Sprays on Float Coal DustPeer Reviewed Journal Article - March 2019
Go to Web Page
NIOSHTIC2 Number: 20050700
J Occup Environ Hyg 2018 Mar; 15(3):214-225
See Also
Airborne Dust Liberation During Coal Crushing
A Centennial of Mine Explosion Prevention Research
Characterization of Airborne Float Coal Dust Emitted During Continuous Mining, Longwall Mining, and Belt Transport
Coal Dust Explosibility Meter Evaluation and Recommendations for Application
Empirical Engineering Models for Airborne Respirable Dust Capture from Water Sprays and Wet Scrubbers
The Explosibility of Coal Dust
Lasers
Open-air Sprays for Capturing and Controlling Airborne Float Coal Dust on Longwall Faces
Rock Dusting Considerations in Underground Coal Mines
Technical Solutions for Enhancements to Mine Safety Using Barricade II Fire Blocking Gel
Page last reviewed: April 4, 2019
Page last updated: April 4, 2019
Content source: National Institute for Occupational Safety and Health, Mining Program
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