Real Time Dust Monitoring To Assist Longwall Respirable Dust Reduction

Strahle, Dion (2004). Real Time Dust Monitoring To Assist Longwall Respirable Dust Reduction B.Sc Thesis, School of Engineering, The University of Queensland.

       
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Author Strahle, Dion
Thesis Title Real Time Dust Monitoring To Assist Longwall Respirable Dust Reduction
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2004
Thesis type B.Sc Thesis
Supervisor Memhet Kizil
Total pages 67
Language eng
Subjects 091405 Mining Engineering
091404 Mineral Processing/Beneficiation
Formatted abstract
The purpose of this study is to assess the effectiveness of the newly developed Tapered Element Oscillating Microbalance (TEOM System) Personal Dust Monitoring (PDM) device as an engineering tool to determine the effectiveness of dust control measures. The developed PDM is believed to be the first dust monitor that delivers an instantaneous dust measurement.
A series of gravimetric personal and static respirable dust sampling was conducted at the North Goonyella Colliery. Personal sampling was conducted predominately on the shearer and chock operators. The tailgate shearer operators experienced dust levels much higher than the maingate shearer operators. The majority of the chock operators sampled experienced dust concentration levels above regulatory standards. As the shift production rate exceeded 4000 tonnes per shift the majority of personal samples were above the regulatory limit.

Static testing was conducted at strategic locations along the longwall face to determine the main sources of dust generation. A minor amount of dust is generated in the intake airways and belt headings. A significant amount of dust is generated at the crusher and stageloader with dust levels at this location above regulatory limits. The main sources of dust are the shearer and the advancement of supports. Sampling mid face recorded extremely high dust concentrations.

Due to the excessive dust levels dust control measures need to be implemented. Personnel can reduce their individual exposure through modification of work practices and the rotation of different tasks. The implementation of homotropal ventilation will dramatically reduce dust concentrations of the longwall face. The implementation of a secondary shearer clearer to cover the full-face extraction height will reduce levels. Investigations should be conducted to determine optimal water spray characteristics. Water sprays located on chock canopies and modifications in the chock advancement procedure will reduce dust generated at this source. The enclosure of the crusher and stageloader and the implementation of extra water sprays will reduce dust at this source. Further study is recommended in the application of water infusion and the use of chemical surfactants is required.

The newly developed Personal Dust Monitor can be worn by mine personnel to alert them of hazardous dust environments. When dust levels exceed regulatory limits personnel are able to remove themselves from the dusty environment. Following this modification of work practices or the implementation of dust controls should be implemented to rectify the situation. Following the implementation of a dust control the personal dust monitor can determine the effectiveness of the control by performing tests in normal operating conditions with and without the implemented control. 
Keyword Tapered Element Oscillating Microbalance (TEOM System)
Personal Dust Monitoring (PDM)

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Mon, 28 Apr 2014, 13:44:22 EST by Ning Jing on behalf of Scholarly Communication and Digitisation Service