A REVIEW OF ATMOSPHERIC MONITORING SYSTEMS IN UNDERGROUND COAL MINES: IMPLICATIONS FOR EXPLOSION PREVENTION Kray Luxbacher Kenny Griffin, Edmund Jong,

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Presentation transcript:

A REVIEW OF ATMOSPHERIC MONITORING SYSTEMS IN UNDERGROUND COAL MINES: IMPLICATIONS FOR EXPLOSION PREVENTION Kray Luxbacher Kenny Griffin, Edmund Jong, Erik Westman Wednesday, March 2 nd, 2011

Outline Introduction and Motivation Select international regulation – China and Australia US Regulation Regulatory Atmosphere in the U.S. AMS Technology – Continuous Monitoring – Tube Bundle Systems Developing Technology and Recommendations

Introduction April 5 th, 2010 The Upper Big Branch Mine Explosion occurred in Montcoal, WV resulting in 29 fatalities. November 19 th, 2010 The Pike River Mine Explosion occurred in New Zealand resulting in 27 fatalities. Numerous other explosions occurred in developing countries.

Motivation “If you cannot measure it, you cannot improve it.” AMS Systems  Real-time  Comprehensive  Continuous AMS Systems  Real-time  Comprehensive  Continuous

Current US Regulation 30 CFR § AMS Operators 30 CFR § Installations in Belt Air 30 CFR § Monitoring of Returns 30 CFR § Monitoring of Returns maintained under 1.5% 30 CFR § Allows intrinsically safe AMS to be energized 30 CFR § Actions taken

Select International Regulations Australia Continuous AMS Systems (typically major return nodes and other areas.) China Gassy underground mines must monitor immediate returns in addition to working face.

Regulatory Atmosphere in the US April 5, 2010 An explosion occurs at the Massey Energy Upper Big Branch Mine in Montcoal, WV. 29 Miners die. April 5, 2010 An explosion occurs at the Massey Energy Upper Big Branch Mine in Montcoal, WV. 29 Miners die. May 6, 2010: Senate Byrd (D-WV) and Rockefeller (D-WV) propose new disclosure regulations. May 6, 2010: Senate Byrd (D-WV) and Rockefeller (D-WV) propose new disclosure regulations. July 1, 2010: House Miller (D-CA) proposes Robert C. Byrd Safety and Health Act of 2010 (HR 5663, 55 co-sponsors) July 1, 2010: House Miller (D-CA) proposes Robert C. Byrd Safety and Health Act of 2010 (HR 5663, 55 co-sponsors) July 20, 2010: House Capito (D-WV) proposes a mine safety and health act (HR 5788, 0 co- sponsors) July 20, 2010: House Capito (D-WV) proposes a mine safety and health act (HR 5788, 0 co- sponsors) July 29, 2010: Senate Rockefeller (D-WV) introduces the Robert C. Byrd Mine and Workplace Safety and Health Act of 2010 (S 3671, 3 co-sponsors) July 29, 2010: Senate Rockefeller (D-WV) introduces the Robert C. Byrd Mine and Workplace Safety and Health Act of 2010 (S 3671, 3 co-sponsors) December 3, 2010: House Miller (D-CA) proposes The Robert C. Byrd Mine Safety Protection Act of 2010 (HR 6495, 1 co-sponsor) December 3, 2010: House Miller (D-CA) proposes The Robert C. Byrd Mine Safety Protection Act of 2010 (HR 6495, 1 co-sponsor) December 8, 2010: House The Robert C. Byrd Mine Safety Protection Act of 2010 fails under a suspended vote (yeas-214, nays-193) December 8, 2010: House The Robert C. Byrd Mine Safety Protection Act of 2010 fails under a suspended vote (yeas-214, nays-193) January 25, 2011: Senate Rockefeller (D-WV) introduces the Robert C. Byrd Mine and Workplace Safety and Health Act of 2011 (S 153, 3 co-sponsors) January 25, 2011: Senate Rockefeller (D-WV) introduces the Robert C. Byrd Mine and Workplace Safety and Health Act of 2011 (S 153, 3 co-sponsors)

Robert C. Byrd Mine and Workplace Safety and Health Act of 2011 Atmospheric Monitoring Section months after enactment of the Robert C. Byrd Mine and Workplace Safety and Health Act of 2011, NIOSH will issue recommendations- – Ensuring best utilization of AMS for health and safety – “the implementation of redundant systems, such as the bundle tubing system, that can continuously monitor the mine atmosphere following incidents such as fires, explosions, entrapments, and inundations.” 270 days after recommendations are received regulation will be promulgated requiring AMS: – protect miners where the miners normally work and travel; – provide real-time information regarding methane and carbon monoxide levels, and airflow direction, as appropriate, with sensing, annunciating, and recording capabilities; and – can, to the maximum extent practicable, withstand explosions and fires.

AMS Technology Continuous Monitoring – Barometric Pressure – Gas and velocity sensing Tube Bundle Systems Developing Technology – Fiber optics – Wireless monitoring

Barometric Pressure

Velocity Sensing Ultrasonic Sensing Thermal Mass Flow Vortex Shedding Differential Pressure Measurement

Gas Sensing Primary Interest Methane, Carbon Dioxide, Carbon Monoxide, Oxygen Also: Fire Gases (Acetylene, Ethane, Ethylene, Hydrogen) Nitrogen and Argon Others such as Hydrogen Sulfide

Tube Bundle Systems

Best Practice Multiple levels of detection 1.Personal detection 2.Fixed detection 3.Continuous real time monitoring 4.Remote monitoring (tube bundle systems) 5.Bag sampling and analysis by GC

Weaknesses of Current Technology Interference from dust and other gases Measurement is often only 0 to LEL (or small range) Frequent calibration required Maintenance intensive

Developing Technology Optical Fiber Sensing Self-calibrating Excellent sensitivity and resolution over a full range No interference from other gases Safe

Fiber Optic Sensing Courtesy of the Center for Photonic Technology. Anbo Wang and Evan Lally, 2010.

Explosion Prevention Must bring multiple system/sensors together and display data in real time in a useful format. An attractive investment Systems must be intelligent – Able to assess multiple parameters and give timely warning of the development of dangerous atmospheres

Recommendations Thorough review of recent explosions – What would have been necessary to sense the development of an explosive atmosphere? – How far in advance can that development be forecast? – Could a system withstand or partially withstand the incident? – Development of novel sensing technology. – Full scale field trials.

Acknowledgements Morgan Massey Numerous operators, engineers, vendors, professors