Coal dust particle size survey of US mines

Sapko, Michael J.; Cashdollar, Kenneth L.; Green, Gregory

doi:10.1016/j.jlp.2007.04.014

Cited by 63 publications

(25 citation statements)

References 2 publications

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“…This combustible material can be feedstock for coal dust explosions, and current mining operations produce finer and more easily combustible particles than was the case in the early twentieth century [1]. Limestone powder, known as rock dust, is used widely as an inerting agent, and mine safety regulations specify minimal total incombustible content (TIC) for both intake and return airways.…”

Section: Abstract-float Dust Wireless Sensor Network Total Incombumentioning

confidence: 99%

Wireless sensors for automated control of total incombustible content (TIC) of dust deposited in underground coal mines

et al. 2015

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This paper presents ongoing research towards a low-cost/low-power wirelessly enabled distributed sensing system that can be placed throughout underground coal mines to potentially measure the total incombustible content (TIC) of the deposited dust. Underground coal mining operations produce finely divided coal dust, called float dust, which deposits throughout the mine. This combustible material can be feedstock for coal dust explosions. In the U.S., Mine Safety and Health Administration (MSHA) standard 23789 dictates that a TIC of 80% or above has to be maintained in coal mine return airways. However, current best practices for collection TIC measurements involve manual sampling and laboratory procedures. In this work, we describe work towards developing a new wireless sensor network (WSN) consisting of low-cost/low-power sensor modules that use a variety of optical and microfabricated sensors to continuously monitor the TIC of the accumulated dust. The information is then transmitted off-board through a reliable ad-hoc wireless network. Called Sensors for Automated Control of Coal Dust (SACCD), this system can potentially, for example, be used to automate the control of rock-dusting equipment to maintain TIC at acceptable levels.

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Section: Abstract-float Dust Wireless Sensor Network Total Incombumentioning

confidence: 99%

Wireless sensors for automated control of total incombustible content (TIC) of dust deposited in underground coal mines

et al. 2015

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“…[15–17] The mass median diameter of deposited coal dust in mine return entries was 122–172 μm, and the mass fraction ≤ 74 μm was 27–38% for 50 bituminous U.S. coal mines. [16] The mass of airborne coal dust ≤ 74 μm in mine ventilation returns is also confounded by the presence of rock dust and requires greater measurement selectivity than deposition samples due to the lower mass concentrations of airborne coal dust.…”

Section: Introductionmentioning

confidence: 99%

“…[16] Harris et al [20] compared LTA methods that preserved limestone while combusting coal but differed by thermal treatment times. Rock and coal dust mixtures were heated at 515°C for 2.5 hr by the Mine Safety and Health Administration (MSHA) National Air and Dust Laboratory (NADL) at Mt.…”

Section: Introductionmentioning

confidence: 99%

Sampling and analysis method for measuring airborne coal dust mass in mixtures with limestone (rock) dust

Barone

Patts

Janisko

et al. 2016

Journal of Occupational and Environmental Hygiene

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Airborne coal dust mass measurements in underground bituminous coal mines can be challenged by the presence of airborne limestone dust, which is an incombustible dust applied to prevent the propagation of dust explosions. To accurately measure the coal portion of this mixed airborne dust, the National Institute for Occupational Safety and Health (NIOSH) developed a sampling and analysis protocol that used a stainless steel cassette adapted with an isokinetic inlet and the low temperature ashing (LTA) analytical method. The Mine Safety and Health Administration (MSHA) routinely utilizes this LTA method to quantify the incombustible content of bulk dust samples collected from the roof, floor, and ribs of mining entries. The use of the stainless steel cassette with isokinetic inlet allowed NIOSH to adopt the LTA method for the analysis of airborne dust samples. Mixtures of known coal and limestone dust masses were prepared in the laboratory, loaded into the stainless steel cassettes, and analyzed to assess the accuracy of this method. Coal dust mass measurements differed from predicted values by an average of 0.5%, 0.2%, and 0.1% for samples containing 20%, 91%, and 95% limestone dust, respectively. The ability of this method to accurately quantify the laboratory samples confirmed the validity of this method and allowed NIOSH to successfully measure the coal fraction of airborne dust samples collected in an underground coal mine.

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“…Methane explosion and coal-dust explosion have been studied separately by several researchers [1][2][3][4][5][6][7][8][9][10]. Paul et al [11] discussed various ways in which the dust explosion hazard can be mitigated to complement the relatively well-established suite of engineering and procedural dust explosion risk-reduction measures.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Characteristics of Methane–Coal-Dust Mixture Explosion and Its Mitigation by Ultra-Fine Water Mist

Xu¹,

Wang²,

Gu³

et al. 2012

Journal of Engineering for Gas Turbines and Power

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This paper presents the results of an experimental investigation on the characteristics of methane-coal-dust mixture explosion and its mitigation hy ultra-fine water mist. Four E12-l-K-type fast response thermocouples, two printed circuit board (PCB) piezotronic pressure transducers were used to obtain the temperature and pressure history, while a GigaView high-speed camera was used to visualize the processes. Different methane concentrations, coal-dust concentrations, diameters of coal particles, and volumes of ultrafine water mist were considered to investigate their effects on methane-coal-dust mixture explosion. The temperature of explosion flame, the maximum explosion overpressure, the maximum rate of overpressure rise, and the critical volume flux of ultra-fine water mist were experimentally determined. The results show that the characteristics of the methane-coal-dust mixture explosion and the mitigating effectiveness by ultra-fine water mist are influenced by the methane concentration, the coal-dust concentration, the coaldust diameter and the applied volume flux of ultra-fine water mist. For example, both the maximum explosion overpressure and rate of overpressure rise increased with increasing of coal-dust concentrations and methane concentrations. All of the test cases indicate that ultra-fine water mist can mitigate the mixture explosion and suppress the flame propagation efficiently from the images recorded by the high-speed video camera.

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Coal dust particle size survey of US mines

Cited by 63 publications

References 2 publications

Wireless sensors for automated control of total incombustible content (TIC) of dust deposited in underground coal mines

Wireless sensors for automated control of total incombustible content (TIC) of dust deposited in underground coal mines

Sampling and analysis method for measuring airborne coal dust mass in mixtures with limestone (rock) dust

Experimental Study on Characteristics of Methane–Coal-Dust Mixture Explosion and Its Mitigation by Ultra-Fine Water Mist

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