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Mining Engineering

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https://www.readbyqxmd.com/read/29780181/dust-control-by-air-blocking-shelves-and-dust-collector-to-bailing-airflow-ratios-for-a-surface-mine-drill-shroud
#1
Y Zheng, W R Reed, J D Potts, M Li, J P Rider
The National Institute for Occupational Safety and Health (NIOSH) recently developed a series of validated models utilizing computational fluid dynamics (CFD) to study the effects of air-blocking shelves on airflows and respirable dust distribution associated with medium-sized surface blasthole drill shrouds as part of a dry dust collector system. Using validated CFD models, three different air-blocking shelves were included in the present study: a 15.2-cm (6-in.)-wide shelf; a 7.6-cm (3-in.)-wide shelf; and a 7...
May 2018: Mining Engineering
https://www.readbyqxmd.com/read/29867256/mineworker-fatigue-a-review-of-what-we-know-and-future-decisions
#2
Tim Bauerle, Zoë Dugdale, Gerald Poplin
No abstract text is available yet for this article.
March 2018: Mining Engineering
https://www.readbyqxmd.com/read/29563650/refuge-alternatives-relief-valve-testing-and-design-with-updated-test-stand
#3
T J Lutz, P T Bissert, G T Homce, J A Yonkey
Underground refuge alternatives require an air source to supply breathable air to the occupants. This requires pressure relief valves to prevent unsafe pressures from building up within the refuge alternative. The U.S. Mine Safety and Health Administration (MSHA) mandates that pressure relief valves prevent pressure from exceeding 1.25 kPa (0.18 psi), or as specified by the manufacturer, above mine atmospheric pressure when a fan or compressor is used for the air supply. The U.S. National Institute for Occupational Safety and Health (NIOSH) tested a variety of pressure relief valves using an instrumented test fixture consisting of data acquisition equipment, a centrifugal blower, ductwork and various sensors to determine if the subject pressure relief valves meet the MSHA requirement...
March 2018: Mining Engineering
https://www.readbyqxmd.com/read/29674789/a-survey-of-atmospheric-monitoring-systems-in-u-s-underground-coal-mines
#4
J H Rowland, S P Harteis, L Yuan
In 1995 and 2003, the U.S. Mine Safety and Health Administration (MSHA) conducted surveys to determine the number of atmospheric monitoring systems (AMS) that were being used in underground coal mines in the United States. The survey reports gave data for the different AMS manufacturers, the different types of equipment monitored, and the different types of gas sensors and their locations. Since the last survey in 2003, MSHA has changed the regulation requirements for early fire detection along belt haulage entries...
February 2018: Mining Engineering
https://www.readbyqxmd.com/read/29416179/foam-property-tests-to-evaluate-the-potential-for-longwall-shield-dust-control
#5
W R Reed, T W Beck, Y Zheng, S Klima, J Driscoll
Tests were conducted to determine properties of four foam agents for their potential use in longwall mining dust control. Foam has been tried in underground mining in the past for dust control and is currently being reconsidered for use in underground coal longwall operations in order to help those operations comply with the Mine Safety and Health Administration's lower coal mine respirable dust standard of 1.5 mg/m3 . Foams were generated using two different methods. One method used compressed air and water pressure to generate foam, while the other method used low-pressure air generated by a blower and water pressure using a foam generator developed by the U...
January 2018: Mining Engineering
https://www.readbyqxmd.com/read/29348700/open-air-sprays-for-capturing-and-controlling-airborne-float-coal-dust-on-longwall-faces
#6
T W Beck, C E Seaman, M R Shahan, S E Mischler
Float dust deposits in coal mine return airways pose a risk in the event of a methane ignition. Controlling airborne dust prior to deposition in the return would make current rock dusting practices more effective and reduce the risk of coal-dust-fueled explosions. The goal of this U.S. National Institute for Occupational Safety and Health study is to determine the potential of open-air water sprays to reduce concentrations of airborne float coal dust, smaller than 75 µm in diameter, in longwall face airstreams...
January 2018: Mining Engineering
https://www.readbyqxmd.com/read/29348699/industrial-internet-of-things-iiot-applications-in-underground-coal-mines
#7
C Zhou, N Damiano, B Whisner, M Reyes
The Industrial Internet of Things (IIoT), a concept that combines sensor networks and control systems, has been employed in several industries to improve productivity and safety. U.S. National Institute for Occupational Safety and Health (NIOSH) researchers are investigating IIoT applications to identify the challenges of and potential solutions for transferring IIoT from other industries to the mining industry. Specifically, NIOSH has reviewed existing sensors and communications network systems used in U.S...
December 2017: Mining Engineering
https://www.readbyqxmd.com/read/29348698/effects-of-fame-biodiesel-and-hvord-on-emissions-from-an-older-technology-diesel-engine
#8
A D Bugarski, J A Hummer, S E Vanderslice
The results of laboratory evaluations were used to compare the potential of two alternative, biomass-derived fuels as a control strategy to reduce the exposure of underground miners to aerosols and gases emitted by diesel-powered equipment. The effects of fatty acid methyl ester (FAME) biodiesel and hydrotreated vegetable oil renewable diesel (HVORD) on criteria aerosol and gaseous emissions from an older-technology, naturally aspirated, mechanically controlled engine equipped with a diesel oxidation catalytic converter were compared with those of widely used petroleum-derived, ultralow-sulfur diesels (ULSDs)...
December 2017: Mining Engineering
https://www.readbyqxmd.com/read/28936001/characterization-of-airborne-float-coal-dust-emitted-during-continuous-mining-longwall-mining-and-belt-transport
#9
M R Shahan, C E Seaman, T W Beck, J F Colinet, S E Mischler
Float coal dust is produced by various mining methods, carried by ventilating air and deposited on the floor, roof and ribs of mine airways. If deposited, float dust is re-entrained during a methane explosion. Without sufficient inert rock dust quantities, this float coal dust can propagate an explosion throughout mining entries. Consequently, controlling float coal dust is of critical interest to mining operations. Rock dusting, which is the adding of inert material to airway surfaces, is the main control technique currently used by the coal mining industry to reduce the float coal dust explosion hazard...
September 2017: Mining Engineering
https://www.readbyqxmd.com/read/28867831/quick-fixes-to-improve-workers-health-results-using-engineering-assessment-technology
#10
E J Haas, A B Cecala
Personal respirable dust sampling and the evaluation of control technologies have been providing exposure information to the mining industry but not necessarily in a way that shows how technology can be integrated to provide organizational support and resources for workers to mitigate dust sources on site. In response, the U.S. National Institute for Occupational Safety and Health (NIOSH) used previously developed Helmet-CAM technology to design and engage in a behavioral/engineering cooperative intervention to initiate and enhance mine site conversations about the risks and potential occurrences of respirable silica dust exposures on the job as well as provide impetus and solutions for mitigating higher sources of dust...
July 2017: Mining Engineering
https://www.readbyqxmd.com/read/28845058/characterization-of-a-mine-fire-using-atmospheric-monitoring-system-sensor-data
#11
L Yuan, R A Thomas, L Zhou
Atmospheric monitoring systems (AMS) have been widely used in underground coal mines in the United States for the detection of fire in the belt entry and the monitoring of other ventilation-related parameters such as airflow velocity and methane concentration in specific mine locations. In addition to an AMS being able to detect a mine fire, the AMS data have the potential to provide fire characteristic information such as fire growth - in terms of heat release rate - and exact fire location. Such information is critical in making decisions regarding fire-fighting strategies, underground personnel evacuation and optimal escape routes...
June 2017: Mining Engineering
https://www.readbyqxmd.com/read/28706322/respirable-dust-measured-downwind-during-rock-dust-application
#12
M L Harris, J Organiscak, S Klima, I E Perera
The Pittsburgh Mining Research Division of the U.S. National Institute for Occupational Safety and Health (NIOSH) conducted underground evaluations in an attempt to quantify respirable rock dust generation when using untreated rock dust and rock dust treated with an anticaking additive. Using personal dust monitors, these evaluations measured respirable rock dust levels arising from a flinger-type application of rock dust on rib and roof surfaces. Rock dust with a majority of the respirable component removed was also applied in NIOSH's Bruceton Experimental Mine using a bantam duster...
May 2017: Mining Engineering
https://www.readbyqxmd.com/read/28867830/effects-of-mine-strata-thermal-behavior-and-mine-initial-temperatures-on-mobile-refuge-alternative-temperature
#13
D S Yantek, L Yan, P T Bissert, M D Klein
Federal regulations require the installation of refuge alternatives (RAs) in underground coal mines. Mobile RAs have a limited ability to dissipate heat, and heat buildup can lead to a life-threatening condition as the RA internal air temperature and relative humidity increase. The U.S. National Institute for Occupational Safety and Health (NIOSH) performed heat testing on a 10-person tent-type training RA and contracted ThermoAnalytics Inc. to develop a validated thermal simulation model of the tested RA. The model was used to examine the effects of the constant mine strata temperature assumption, initial mine air temperature, initial mine strata surface temperature (MSST), initial mine strata temperature at depth (MSTD) and mine strata thermal behavior on RA internal air temperature using 117 W (400 Btu/h) of sensible heat input per simulated miner...
April 2017: Mining Engineering
https://www.readbyqxmd.com/read/28413231/development-of-a-roof-bolter-canopy-air-curtain-for-respirable-dust-control
#14
W R Reed, G J Joy, B Kendall, A Bailey, Y Zheng
Testing of the roof bolter canopy air curtain (CAC) designed by the U.S. National Institute for Occupational Safety and Health (NIOSH) has gone through many iterations, demonstrating successful dust control performance under controlled laboratory conditions. J.H. Fletcher & Co., an original equipment manufacturer of mining equipment, further developed the concept by incorporating it into the design of its roof bolting machines. In the present work, laboratory testing was conducted, showing dust control efficiencies ranging from 17...
January 2017: Mining Engineering
https://www.readbyqxmd.com/read/28018004/reducing-float-coal-dust-field-evaluation-of-an-inline-auxiliary-fan-scrubber
#15
J R Patts, J F Colinet, S J Janisko, T L Barone, L D Patts
Controlling float coal dust in underground coal mines before dispersal into the general airstream can reduce the risk of mine explosions while potentially achieving a more effective and efficient use of rock dust. A prototype flooded-bed scrubber was evaluated for float coal dust control in the return of a continuous miner section. The scrubber was installed inline between the face ventilation tubing and an exhausting auxiliary fan. Airborne and deposited dust mass measurements were collected over three days at set distances from the fan exhaust to assess changes in float coal dust levels in the return due to operation of the scrubber...
December 2016: Mining Engineering
https://www.readbyqxmd.com/read/28042176/defining-hazard-from-the-mine-worker-s-perspective
#16
B M Eiter, C L Kosmoski, B P Connor
In the recent past, the mining industry has witnessed a substantial increase in the numbers of fatalities occurring at metal and nonmetal mine sites, but it is unclear why this is occurring. One possible explanation is that workers struggle with identifying worksite hazards and accurately assessing the associated risk. The purpose of this research was to explore this possibility within the mining industry and to more fully understand stone, sand and gravel (SSG) mine workers' thoughts, understandings and perceptions of worksite hazards and risks...
November 2016: Mining Engineering
https://www.readbyqxmd.com/read/27932851/computational-fluid-dynamic-modeling-of-a-medium-sized-surface-mine-blasthole-drill-shroud
#17
Y Zheng, W R Reed, L Zhou, J P Rider
The Pittsburgh Mining Research Division of the U.S. National Institute for Occupational Safety and Health (NIOSH) recently developed a series of models using computational fluid dynamics (CFD) to study airflows and respirable dust distribution associated with a medium-sized surface blasthole drill shroud with a dry dust collector system. Previously run experiments conducted in NIOSH's full-scale drill shroud laboratory were used to validate the models. The setup values in the CFD models were calculated from experimental data obtained from the drill shroud laboratory and measurements of test material particle size...
November 2016: Mining Engineering
https://www.readbyqxmd.com/read/28018003/refuge-alternatives-relief-valve-testing-and-design
#18
T J Lutz, P T Bissert, G T Homce, J A Yonkey
The U.S. National Institute for Occupational Safety and Health (NIOSH) has been researching refuge alternatives (RAs) since 2007. RAs typically have built-in pressure relief valves (PRVs) to prevent the unit from reaching unsafe pressures. The U.S. Mine Safety and Health Administration requires that these valves vent the chamber at a maximum pressure of 1.25 kPa (0.18 psi, 5.0 in. H2 O), or as specified by the manufacturer, above mine atmospheric pressure in the RA. To facilitate PRV testing, an instrumented benchtop test fixture was developed using an off-the-shelf centrifugal blower and ductwork...
October 2016: Mining Engineering
https://www.readbyqxmd.com/read/27942076/validation-of-temperature-and-humidity-thermal-model-of-23-person-tent-type-refuge-alternative
#19
L Yan, D Yantek, M Klein, P Bissert, R Matetic
U.S. Mine Safety and Health Administration (MSHA) regulations require underground coal mines to use refuge alternatives (RAs) to provide a breathable air environment for 96 hours. One of the main concerns with the use of mobile RAs is heat and humidity buildup inside the RA. The accumulation of heat and humidity can result in miners suffering heat stress or even death. MSHA regulations require that the apparent temperature in an occupied RA not exceed 95 °F. To investigate this, the U.S. National Institute for Occupational Safety and Health (NIOSH) conducted testing on a 23-person tent-type RA in its Experimental Mine in a test area that was isolated from the mine ventilation system...
September 2016: Mining Engineering
https://www.readbyqxmd.com/read/27524838/comparison-of-merv-16-and-hepa-filters-for-cab-filtration-of-underground-mining-equipment
#20
A B Cecala, J A Organiscak, J D Noll, J A Zimmer
Significant strides have been made in optimizing the design of filtration and pressurization systems used on the enclosed cabs of mobile mining equipment to reduce respirable dust and provide the best air quality to the equipment operators. Considering all of the advances made in this area, one aspect that still needed to be evaluated was a comparison of the efficiencies of the different filters used in these systems. As high-efficiency particulate arrestance (HEPA) filters provide the highest filtering efficiency, the general assumption would be that they would also provide the greatest level of protection to workers...
August 2016: Mining Engineering
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