Influence of the nanoaerosol fraction of industrial coal dust on the combustion of methane–air mixtures

Valiulin, S. V.; Baklanov, A.; Dubtsov, S.N.; Zamaschikov, V. V.; Клишин, В. И.; Конторович, А. Э.; Korzhavin, A. A.; Onischuk, A. A.; Paleev, D. Yu.; Purtov, P. A.; Куйбида, Л. В.

doi:10.1134/s0010508216040043

Cited by 7 publications

(9 citation statements)

References 15 publications

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“…1. The maternal substance consisting mainly of C 14 -C 22 hydrocarbons (Valiulin et al 2016) is charged to the saturator. The mass of the charged substance is varied within the range 0-10 g. The heating temperature in the saturation chamber is 700 K, which exceeds the boiling temperature of the major components of the maternal mixture.…”

Section: Resultsmentioning

confidence: 99%

“…It was determined by Valiulin et al (2016) and Onischuk et al (2017) that the reason for the formation of organic aerosol in coal mines is in frictional heating, which occurs when a metal cutting bit strikes the rock. The heat release is so strong that it causes hydrocarbon boiling in the carbon matrix.…”

Section: Laboratory Aerosol Generation and Samplingmentioning

confidence: 99%

“…It was determined by Baklanov et al (2015), Valiulin et al (2016) and Onischuk et al (2017) that the release of frictional heat results in the emission of organic components (C 14 -C 22 ) along with methane. The evaporated organic matter is transformed into aerosol aggregates, and the mass concentration of organic aerosol is comparable to that of emitted methane.…”

Section: Introductionmentioning

confidence: 99%

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Effect of coal mine organic aerosol on the methane/air lower explosive limit

Valiulin

Onischuk

Baklanov

et al. 2020

Int J Coal Sci Technol

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Organic aerosol is formed in coal mines due to heat release and evaporation of organics from coal during the longwall operation. This frictional heating occurs when a metallic cutting bit strikes a rock. Thus formed organic aerosol can contribute significantly to the explosivity of methane/air atmosphere in coal mines. In this paper, the flammable limits for the methane-air mixtures with organic aerosol are determined. For this purpose, organic aerosol is synthesizes from the coal-tar pitch in a laboratory evaporation-nucleation flow chamber. Aerosol particles synthesized under laboratory conditions are aggregates consisting of small primary particles with the fractal-like dimension D f = 2.0 ± 0.1, which is close to D f-= 2.1 ± 0.1 of coal mine aerosol. It is shown that the flammability of organic aerosol/methane mixture in air is in good agreement with the Le Chatelier additive principle. The lower ignition limit for the pure organic aerosol in air is 44 g/m 3 .

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Section: Resultsmentioning

confidence: 99%

Section: Laboratory Aerosol Generation and Samplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of coal mine organic aerosol on the methane/air lower explosive limit

Valiulin

Onischuk

Baklanov

et al. 2020

Int J Coal Sci Technol

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“…The chemical composition of organic nanoparticles formed by mechanical treatment of coal was studied in our previous paper (Valiulin et al, 2016). Analysis by means of gas chromatography -mass spectrometry show that the chromatograms from coal extract were identical to those from organic nanoparticles except for light alkanes C 10 -C 13 which were absent from the chromatograms of particles (the vapor of these species was probably undersaturated in the nucleation zone).…”

Section: Formation Of Aerosol and Gaseous Products During The Mechanimentioning

confidence: 99%

“…In our previous papers (Baklanov et al, 2015;Valiulin et al, 2016) some preliminary results were obtained, demonstrating high concentration of nanoaerosol generated by a longwall shearer in a coal mine of the Kuznetsk Basin (Russia). However, the size distribution function for the coal mine aerosol was measured in these papers for the limited range of diameters 3-200 nm, and, therefore, the relationship between the nano-size and micron-size particles was not accurately determined.…”

Section: Introductionmentioning

confidence: 99%

Organic Nanoaerosol in Coal Mines: Formation Mechanism and Explosibility

Onischuk

Dubtsov

Baklanov

et al. 2017

Aerosol Air Qual. Res.

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The mechanism of aerosol formation in coal mines during the operation of a longwall shearer was studied using a diffusion battery, optical counter, and by means of Transmission Electron Microscopy (TEM). The aerosol number concentration was measured to be (2-5) × 10 5 cm -3 . The aerosol size spectrum contained three modes, at about 10, 100, and 1000 nm. The first mode relates to single (primary) particles formed by the homogeneous nucleation of supersaturated organic vapor. This vapor is formed by the evaporation of organic matter from coal due to the release of frictional heat at the interface between the cutting pick and coal. The second mode relates to the particles that are aggregates formed by coagulation of primary particles. The third mode relates to the particles formed by direct grinding of coal by the cutting picks.The laboratory studies of organic aerosol formation in a flow coal grinding machine showed that the size spectrum and morphology of aerosol from the grinding machine were close to those in the coal mine. This fact confirms the thesis that the release of frictional heat is the driving force for the formation of organic aerosol. The analysis of gas-phase products in the outflow of the grinding machine showed that along with aerosol formation, gas products such as CO, CO 2 , CH 4 , C 2 H 6 , H 2 O are released from coal due to the frictional heat. M ethane and ethane concentrations in the flow reached 10 and 5 vol. %, respectively.To demonstrate the explosibility of organic aerosol, the combustion of organic aerosol in the air was studied. It was shown that the lower explosive limit for organic aerosol is less than 50 g m -3. A conclusion is made that the formation of organic aerosol is to be taken into account when estimating the safety limits in coal mines.

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Evaluation of Sub-micrometer-Sized Particles Generated from a Diesel Locomotive and Jackleg Drilling in an Underground Metal Mine

Tsai

Shin

Brune

2020

Annals of Work Exposures and Health

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Concerns have been raised regarding small respirable particles, i.e. sub-micrometer-sized particles, associated with mining activities. This evaluation was designed to investigate the emissions from jackleg drilling and diesel engines and to characterize the nature of emitted particles using gravimetric analysis and number metrics. The mass concentration to which workers are potentially exposed was determined from a 4-h sampling in the vicinity of drilling activities in an underground metal mine; this concentration was found to be lower than 0.6 mg m−3 of total respirable dust. This mass concentration is low; however, the number concentrations of emitted particles from drilling exceeded 1 × 106 particles cm−3 in areas 7–9 m downwind from the drilling operation. Sub-micrometer-sized particles were also observed in aerosol samples collected using a specialized sampler, and various elements associated with drilling were found among these emitted particles. Finally, the particles in the diesel exhaust were collected, and the exhaust was found to contain nanometer-sized particles.

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Influence of the nanoaerosol fraction of industrial coal dust on the combustion of methane–air mixtures

Cited by 7 publications

References 15 publications

Effect of coal mine organic aerosol on the methane/air lower explosive limit

Effect of coal mine organic aerosol on the methane/air lower explosive limit

Organic Nanoaerosol in Coal Mines: Formation Mechanism and Explosibility

Evaluation of Sub-micrometer-Sized Particles Generated from a Diesel Locomotive and Jackleg Drilling in an Underground Metal Mine

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