Influences of ventilation parameters on flow field and dust migration in an underground coal mine heading

Abstract

In order to effectively improve the efficiency of ventilation and dust removal, the flow field and dust migration characteristics under different ventilation parameters are deeply studied and analyzed by using the method of similar experiment and numerical simulation. Research results show that the change of the height of the ventilation duct affects the shape of the jet fluid, wind velocity distribution, the vortex distribution and the degree of disturbance of the airflow in the recirculation zone. When the height of the ventilation duct is h = 0.625 H (H is the height of the roadway), it shows a good ventilation and dust removal efficiency in roadway. The closer the ventilation duct is to the working face, the greater the eddy current intensity in the roadway and the more serious the dust accumulation. If the ventilation duct is 2 m away from the head, the dust concentration in roadway is relatively low. It shows a better ventilation and dedusting effect when the air velocity of ventilation duct v = 30 m/s, but it has a weak influence on the flow field structure in the roadway. The research results provide theoretical guidance for the selection, design and parameter optimization of the roadway ventilation and dust removal process.

Bibliometric analysis and review of mine ventilation literature published between 2010 and 2023

“…In addition to research on air curtains, adjusting ventilation parameters in mine ventilation is another focal point of dust concentration control research. For instance, Wei et al conducted an in-depth study and analysis of flow patterns and dust transport characteristics under various ventilation parameters, using a combination of similarity experiments and numerical simulations [ 102 ]. Xie et al employed a combination of numerical simulations and field experiments to analyze the impact of the installation position of the push-pull fan on the airflow and dust transport behavior in the roadway [ 103 ].…”

Research on Dust Migration and Dust Deposition Rules of Breathing Zone in Fully Mechanized Mining Face

“…The differential equation of dust force in the Lagrangian coordinate system is integrated into Fluent’s built-in DPM model to compute the trajectory of coal dust particles in the continuous phase, resulting in the migration and concentration distribution law of coal dust in the roadway. The differential equation for the force on coal dust is as follows: ,, normald u normalp → normald t = F D ( u ⃗ − u p → ) + g x ( ρ normalp − ρ ) ρ normalp + F x → F D = 18 μ ρ p d p 2 C D R e 24 where, u denotes continuous phase velocity, with a unit of m/s; u p denotes dust particle velocity, with a unit of m/s; g x denotes acceleration of gravity in the x -direction, with a unit of m/s 2 ; ρ p denotes dust particle density, with a unit of kg/m 3 ; d p denotes particle diameter, with a unit of m; C D denotes drag coefficient; Re denotes relative Reynolds number; F D ( u ⃗ − u p → ) denotes drag force per unit mass of coal dust particles, with a unit of N; F x → denotes other additional forces on the particle, mainly including virtual mass force, pressure gradient force, Saffman lift force, etc., with a unit of N. However, other additional forces can generally be neglected relative to the magnitude of the traction, gravity, and buoyancy forces on the particle.…”

The influence of the shape and size of dust fractions on their distribution and accumulation in mine workings when changing the structure of air flow

“…их нельзя полностью отнести к частицам изометрической формы (сфера или правильный многогранник). Для количественной оценки подобной класс-формы использовалась разработанная методика на основе перекрестного метода [31][32][33][34].…”