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Mining Publication: Experimental Study on Foam Coverage on Simulated Longwall Roof
Keywords: Foam application Longwall shields
Original creation date: February 2018
Authors: W Reed, Y Zheng, S Klima, M Shahan, T Beck
Peer Reviewed Journal Article - February 2018
Go to Web Page
NIOSHTIC2 Number: 20054554
Trans Soc Min Metall Explor 2018 Feb; 342:72-82
Testing was conducted to determine the ability of foam to maintain roof coverage in a simulated longwall mining environment. Approximately 27 percent of respirable coal mine dust can be attributed to longwall shield movement, and developing controls for this dust source has been difficult. The application of foam is a possible dust control method for this source. Laboratory testing of two foam agents was conducted to determine the ability of the foam to adhere to a simulated longwall face roof surface. Two different foam generation methods were used: compressed air and blower air. Using a new imaging technology, image processing and analysis utilizing ImageJ software produced quantifiable results of foam roof coverage. For compressed air foam in 3.3 m/s (650 fpm) ventilation, 98 percent of agent A was intact while 95 percent of agent B was intact on the roof at three minutes after application. At 30 minutes after application, 94 percent of agent A was intact while only 20 percent of agent B remained. For blower air in 3.3 m/s (650 fpm) ventilation, the results were dependent upon nozzle type. Three different nozzles were tested. At 30 min after application, 74 to 92 percent of foam agent A remained, while 3 to 50 percent of foam agent B remained. Compressed air foam seems to remain intact for longer durations and is easier to apply than blower air foam. However, more water drained from the foam when using compressed air foam, which demonstrates that blower air foam retains more water at the roof surface. Agent A seemed to be the better performer as far as roof application is concerned. This testing demonstrates that roof application of foam is feasible and is able to withstand a typical face ventilation velocity, establishing this technique’s potential for longwall shield dust control.
First page of Experimental Study on Foam Coverage on Simulated Longwall RoofPeer Reviewed Journal Article - February 2018
Go to Web Page
NIOSHTIC2 Number: 20054554
Trans Soc Min Metall Explor 2018 Feb; 342:72-82
See Also
The Design of a Laboratory Apparatus to Simulate the Dust Generated by Longwall Shield Advances
Evaluation of Support and Ground Response as Longwall Face Advances into and Widens Pre-Driven Recovery Room
Laboratory Testing To Quantify Dust Entrainment During Shield Advance
Longwall Retreat of Gate Road Pillars
Longwall Shield and Standing Gateroad Support Designs - Is Bigger Better?
Longwall Shield Recovery Using Mobile Roof Supports
The NIOSH Shield Hydraulics Inspection and Evaluation of Leg Data (Shield) Computer Program
Performance and Safety Considerations of Hydraulic Support Systems
Proceedings: New Technology for Coal Mine Roof Support
Pumpable Roof Supports: An Evolution in Longwall Roof Support Technology
Page last reviewed: March 27, 2019
Page last updated: March 27, 2019
Content source: National Institute for Occupational Safety and Health, Mining Program
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