Comparative study of the explosion pressure characteristics of micro- and nano-sized coal dust and methane–coal dust mixtures in a pipe

Tan, Bo; Liu, Huilin; Xu, Bin; Wang, Tian

doi:10.1007/s40789-019-00289-w

Cited by 21 publications

(8 citation statements)

References 31 publications

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“…In recent years, the problem of dust management has been paid more and more attention. (Luo et al 2017;Reed et al 2018Reed et al , 2019Shahan and Reed 2019;Yao et al 2020;Tan et al 2020). Dust reduction by wetting as the most commonly used method is far more effective than ventilation.…”

Section: Introductionmentioning

confidence: 99%

Exploration on molecular dynamics simulation methods of microscopic wetting process for coal dust

Zhang

Chen

Wang

et al. 2021

Int J Coal Sci Technol

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Wet dust removal is one of the main technical measures in coal dust control, and coal dust wetting is the key factor to determine the effect of wet dust removal. In order to explore the micro-wetting process of coal dust, this paper uses molecular dynamics simulation to study the micro-wetting process of coal dust in different simulation conditions. The molecular dynamics simulation was carried out under different ensemble, thermodynamic states as well as relaxation pretreatment methods, then the H2O molecular layer and coal dust molecular layer in each simulation were quantitatively analyzed by relative concentration. The research results show that a method for establishing molecular model of lignite is proposed and the 2D periodic surface structure is more reasonable. The surface system of coal-H2O molecule is established by NVT aeration method, where the simulation result is close to the actual coal dust wetting process. The simulation effect of medium and large coal dust-H2O molecular system is better than that of small coal dust-H2O molecular system. This study provides a new solution for changing the empirical method of molecular dynamics simulation of coal system wetting and oversimplification of coal system.

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Section: Introductionmentioning

confidence: 99%

Exploration on molecular dynamics simulation methods of microscopic wetting process for coal dust

Zhang

Chen

Wang

et al. 2021

Int J Coal Sci Technol

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“…Long-forced-short-extracted ventilation is a common dust suppression method in mechanized excavation faces (Liu et al 2019c;Wang et al 2018a, b;Tan et al 2020;Wang et al 2019g). However, this technique cannot effectively control dust production at the mechanized excavation face.…”

Section: Introductionmentioning

confidence: 99%

Determination of optimal blowing-to-suction flow ratio in mechanized excavation face with wall-mounted swirling ventilation using numerical simulations

Gao

Wang

et al. 2021

Int J Coal Sci Technol

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Wall-mounted swirling ventilation is a new type of system in mechanized excavation faces with a dust suppression performance that is closely related to the blowing-to-suction flow ratio. Physical and simulation models were developed according to the No. C103 mechanized excavation face in the Nahe Coal Mine of the Baise Mining Bureau, Guangxi Province to optimize the blowing-to-suction flow ratio for wall-mounted swirling ventilation. Both the k-ε turbulence model and the discrete phase model were utilized to simulate airflow field structures and dust concentration distribution patterns at various blowing-to-suction flow ratios. The results suggest that higher blowing-to-suction flow ratios increase the airflow field disturbance around the working face and weaken the intensity of the axial air curtain. On the other hand, both the intensity of the radial air curtain and the dust suppression effect are enhanced. At a blowing-to-suction flow ratio of 0.8, the wall-mounted swirling ventilation system achieved the most favorable dust suppression performance. Both the total dust and respirable dust had their lowest concentrations with maximum efficiencies of reducing both types at 90.33% and 87.16%, respectively.

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“…A report by the Mine Safety and Health Administration (MSHA) states that, since 1968, black lung has caused or contributed to the deaths of 76,000 coal miners [21]. Additionally, a coal dust explosion triggered by a methane explosion as a result of high dust concentration in the mine entries poses a serious safety concern [22][23][24][25][26][27][28][29]. The Jim Walter No.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of the Effect of Integration of a Flooded-Bed Scrubber into a Longwall Shearer on Airflow along a Coal Mine Longwall Face

2021

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Dust control is one of the most difficult challenges for underground coal mine operators, especially longwall mine operators. The most widely used dust control technologies at a longwall section are ventilation air and water sprays, whereas a continuous miner section has the added advantage of having a dust scrubber built into the continuous miner. To test the potential benefits of integrating a flooded-bed scrubber into a longwall shearer, the authors designed and built a dust scrubber system for a full-scale mock-up of a longwall shearer. The mock-up was installed in the longwall test gallery at the Pittsburgh Research Laboratory (PRL) for testing. Air quantity surveys were performed at different cross-sections of the test gallery at a fixed face-air quantity, but at different scrubber airflow rates to quantify the distribution of air in the test gallery. Subsequently, a computational fluid dynamics (CFD) model of the PRL test gallery was developed and validated. In this study, the effect of the flooded-bed scrubber on airflow pattern in the test gallery is investigated using the validated CFD model. This model can be used further to predict the dust capture efficiency of the scrubber and to develop new techniques to reduce dust concentration in longwall sections.

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Comparative study of the explosion pressure characteristics of micro- and nano-sized coal dust and methane–coal dust mixtures in a pipe

Cited by 21 publications

References 31 publications

Exploration on molecular dynamics simulation methods of microscopic wetting process for coal dust

Exploration on molecular dynamics simulation methods of microscopic wetting process for coal dust

Determination of optimal blowing-to-suction flow ratio in mechanized excavation face with wall-mounted swirling ventilation using numerical simulations

Experimental and Numerical Investigation of the Effect of Integration of a Flooded-Bed Scrubber into a Longwall Shearer on Airflow along a Coal Mine Longwall Face

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