Reducing float coal dust: Field evaluation of an inline auxiliary fan scrubber

Patts, J.R.; Colinet, Jay F.; Janisko, Samuel J.; Barone, Teresa; Patts, Larry D.

doi:10.19150/me.6883

Cited by 6 publications

(6 citation statements)

References 6 publications

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“…To prevent such an explosion, coal dust on mine surfaces should be adequately treated with incombustible dust [2]. In addition, coal dust can be removed from mine air before it deposits and accumulates on mine surfaces [3][4].…”

Section: Introductionmentioning

confidence: 99%

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Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology

Barone

Hesse

Seaman

et al. 2019

Advanced Powder Technology

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Section: Introductionmentioning

confidence: 99%

“…Coal dust can be removed from mine air by using control technologies such as wet scrubbers [3][4] and water sprays [5]. The effectiveness of these control technologies can be determined by measuring the particle size distribution (PSD) upstream and downstream of their application.…”

Section: Introductionmentioning

confidence: 99%

Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology

Barone

Hesse

Seaman

et al. 2019

Advanced Powder Technology

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“…The secondary method of evaluating the spray efficiencies used total dust samplers to collect airborne dust during each phase of testing. [36] Three IOM samplers, each containing a 25-mm quartz fiber filter and fitted with an isokinetic nozzle, were positioned 6.4 cm apart on a mounting bracket 10 cm above the CAS-POL portion of the CAPS instrument (Figure 1). Each sampler was connected to a critical flow orifice, regulating the flow through the sampler to 2 L/min.…”

Section: Methodsmentioning

confidence: 99%

Comparison of the CAS-POL and IOM samplers for determining the knockdown efficiencies of water sprays on float coal dust

Seaman

Bugarski

Beck

et al. 2018

Journal of Occupational and Environmental Hygiene

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Float coal dust, generated by mining operations, is distributed throughout mine airways by ventilating air designed to purge gases and respirable dust. Float coal dust poses an explosion hazard in the event of a methane ignition. Current regulation requires the application of inert rock dust in areas subjected to float coal dust in order to mitigate the hazard. An alternate method using water sprays, which have been effective in controlling respirable dust hazards, has been proposed as a way to control float coal dust generated on longwall faces. However, the knockdown efficiency of the proposed water sprays on float coal dust needs to be verified. This study used gravimetric isokinetic Institute of Occupational Medicine (IOM) samplers alongside a real-time aerosol monitor (Cloud Aerosol Spectrometer with polarization; CAS-POL) to study the effects of spray type, operating pressure, and spray orientation on knockdown efficiencies for seven different water sprays. Because the CAS-POL has not been used to study mining dust, the CAS-POL measurements were validated with respect to the IOM samplers. This study found that the CAS-POL was able to resolve the same trends measured by the IOM samplers, while providing additional knockdown information for specific particle size ranges and locations in the test area. In addition, the CAS-POL data was not prone to the same process errors, which may occur due to the handling of the IOM filter media, and was able to provide a faster analysis of the data after testing. This study also determined that pressure was the leading design criteria influencing spray knockdown efficiency, with spray type also having some effect and orientation having little to no effect. The results of this study will be used to design future full-scale float coal dust capture tests involving multiple sprays, which will be evaluated using the CAS-POL.

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“…[3] To provide additional strategies for meeting TIC criteria, control systems are being developed for airborne coal dust removal. [4, 5] These systems are most often evaluated in mine airways where rock dusting is carried out and where airborne rock dust is present. [4, 6] The confounding presence of airborne rock dust in coal dust samples has been addressed by low-temperature ashing (LTA) of filter samples using a stainless steel Institute of Occupational Medicine (IOM) cassette with quartz-fiber media.…”

Section: Introductionmentioning

confidence: 99%

“…[4, 5] These systems are most often evaluated in mine airways where rock dusting is carried out and where airborne rock dust is present. [4, 6] The confounding presence of airborne rock dust in coal dust samples has been addressed by low-temperature ashing (LTA) of filter samples using a stainless steel Institute of Occupational Medicine (IOM) cassette with quartz-fiber media. [7] With this method, coarse coal dust masses can be determined in mixtures of limestone rock dust in filter samples collected for control technology assessments.…”

Section: Introductionmentioning

confidence: 99%

Comparison of coarse coal dust sampling techniques in a laboratory-simulated longwall section

Patts

Barone

2017

Journal of Occupational and Environmental Hygiene

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Airborne coal dust generated during mining can deposit and accumulate on mine surfaces, presenting a dust explosion hazard. When assessing dust hazard mitigation strategies for airborne dust reduction, sampling is done in high-velocity ventilation air, which is used to purge the mining face and gallery tunnel. In this environment, the sampler inlet velocity should be matched to the air stream velocity (isokinetic sampling) to prevent oversampling of coarse dust at low sampler-to-air velocity ratios. Low velocity ratios are often encountered when using low flow rate, personal sampling pumps commonly used in underground mines. In this study, with a goal of employing mine-ready equipment, a personal sampler was adapted for area sampling of coarse coal dust in high-velocity ventilation air. This was done by adapting an isokinetic nozzle to the inlet of an Institute of Occupational Medicine (Edinburgh, Scotland) sampling cassette (IOM). Collected dust masses were compared for the modified IOM isokinetic sampler (IOM-MOD), the IOM without the isokinetic nozzle, and a conventional dust sampling cassette without the cyclone on the inlet. All samplers were operated at a flow rate typical of personal sampling pumps: 2 L/min. To ensure differences between collected masses that could be attributed to sampler design and were not influenced by artifacts from dust concentration gradients, relatively uniform and repeatable dust concentrations were demonstrated in the sampling zone of the National Institute for Occupational Safety and Health experimental mine gallery. Consistent with isokinetic theory, greater differences between isokinetic and non-isokinetic sampled masses were found for larger dust volume-size distributions and higher ventilation air velocities. Since isokinetic sampling is conventionally used to determine total dust concentration, and isokinetic sampling made a difference in collected masses, the results suggest when sampling for coarse coal dust the IOM-MOD may improve airborne coarse dust assessments over “off-the-shelf” sampling cassettes.

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Reducing float coal dust: Field evaluation of an inline auxiliary fan scrubber

Cited by 6 publications

References 6 publications

Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology

Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology

Comparison of the CAS-POL and IOM samplers for determining the knockdown efficiencies of water sprays on float coal dust

Comparison of coarse coal dust sampling techniques in a laboratory-simulated longwall section

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