Investigation on dust dispersion during support movement in a fully mechanized mining face and the technology with support frame enclosure dust control

Mo, Jinming; Ma, Wei; Li, Dandan; Zhang, Sheji

doi:10.1177/09544089211031116

Cited by 2 publications

(1 citation statement)

References 30 publications

(33 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also, an onboard dust collector was proposed for the shearer and an enclosure dust control device for the hydraulic support. It was revealed from the field applications that the dust reduction efficiency of the two devices in the pedestrian area reached 49.3% and 94.8%, respectively (Mo et al, 2020; Mo et al, 2021). Cheng Weimin et al, numerically studied the migration law of airflow-dust and the dispersion mode of dust with various particle sizes during coal cutting by the shearer drum at the fully-mechanized mining face with a large mining height.…”

Section: Introductionmentioning

confidence: 99%

Study on the coupling migration law of airflow-respiratory dust of an 8-m high fully-mechanized mining face

Chen

Mo²,

Ma³

2022

Energy Exploration & Exploitation

Self Cite

View full text Add to dashboard Cite

8-m super-high fully mechanized mining face has been successfully applied in China, which has brought many difficulties to dust control. The main reason is that the mining height increases and the dust distribution and evolution law are quite different. Targeting the 12,513 fully-mechanized mining face in Bulianta Coal Mine of China in this paper. The spatial evolution of airflow-respiratory dust of an 8-m high fully-mechanized mining face is analyzed using numerical simulation and underground measurement methods. The results reveal that the numerical and measured results are consistent. At the working range from 15 m in front of the shearer to 30 m behind it, the wind speed increases with an average rise of 70% on the coal cutting side. The airflow diffusion at the working face is primarily longitudinal and partly transverse. Along the airflow direction, the respiratory dust concentration in the pedestrian space first increases and decreases, followed by a marginal increase and gradual decrease，and the dust concentration increased with the increase of height, the migration distance of dust particles was directly proportional to time, and the smaller dust particles were prone to transverse diffusion. In the range of 20–30 m from the downwind side of the shearer, the transverse diffusion of coal cutting dust and the dust produced by support coal falling show conversion, leading to the increase of dust concentration. Under the same dust production intensity, compared with ordinary mining height, with the increase of mining height, the influence range of dust diffusion is wider, the floating duration is longer, and the space dust concentration will be reduced, and the support coal falling dust is the main dust pollution source in pedestrian space. The results reveal that the numerical and measured results are consistent, and obtained the relationship of spatial evolutions of respiratory dust

show abstract

Section: Introductionmentioning

confidence: 99%

Study on the coupling migration law of airflow-respiratory dust of an 8-m high fully-mechanized mining face

Chen

Mo²,

Ma³

2022

Energy Exploration & Exploitation

Self Cite

View full text Add to dashboard Cite

show abstract

A Study on Dust-Control Technology Used for Large Mining Heights Based on the Optimization Design of a Tracking Spray Nozzle

Zhang

Chang

2023

Atmosphere

View full text Add to dashboard Cite

Intense cutting-induced dust production in fully mechanized mining faces (FMMFs) with large mining heights produces a high amount of dust that is difficult to capture and severely affects the working environment, threatening the health of occupational staff. The effective spray range and atomization performance of tracking sprays are counteracted by the influences of the mine’s height and ventilation airflow in FMMFs. Thus, optimizing the spray’s parameters and relationship between the effective spray range and atomization performance to reduce dust levels is the main priority of dust-control techniques. In this study, a new swirl-core atomization nozzle is developed based on fluid mechanics and the solid–liquid coalescence mechanism. The liquid generates a circumferential velocity when passing through the swirl core, which considerably increases the droplet breaking power and reduces the droplet cohesion factor, achieving a remarkable atomization effect. The spray angle of the new nozzle is 57°, which is 80.9% greater than the GZPW-16 mine-use nozzle (31.5°); the effective spray range increases from 5.2 to 5.9 m; and the spray’s mist saturation is significantly better than the GZPW-16 mine-use nozzle. Under different test pressures, the particle size range of the droplets produced by the new nozzle and dust particles on site satisfied the best synergy of droplet–dust coalescence. The total and respirable dust-reduction rates were 78% and 75.1%, respectively, which were 42% and 65% higher than those of the original nozzle. The new nozzle effectively improves the efficiency of the single dust-control technique of the tracking spray, which is significant for the dust-prevention and -control technology of FMMFs with large mining heights.

show abstract

Investigation on dust dispersion during support movement in a fully mechanized mining face and the technology with support frame enclosure dust control

Cited by 2 publications

References 30 publications

Study on the coupling migration law of airflow-respiratory dust of an 8-m high fully-mechanized mining face

Study on the coupling migration law of airflow-respiratory dust of an 8-m high fully-mechanized mining face

A Study on Dust-Control Technology Used for Large Mining Heights Based on the Optimization Design of a Tracking Spray Nozzle

Contact Info

Product

Resources

About