Dust control efficiency improvement

Abstract

High dustiness of operating space in coal mines and active methane emission detains faster driving of coal production and weakens competitive ability of coal mines. From the physical research of inertia movement of rotation liquid drops, the mathematical model of the circulation in the gas environment is constructed to develop more effective dust catching techniques. It is proved that the equation of fluid whirl diffusion in motion of a liquid drop along a spiral line is identical to the equation of thermal conductivity with dispersion coefficient of liquid drop rotation energy. It is confirmed that circulation of liquid drops, both in super Stokes and Stokes flows, enlarges the relaxation time owing to reduction in aerodynamic drag factor of the gas environment, conditioned by the increase in the effective value of the Reynolds number with the increased rotational velocity of liquid drops. The averaging of the aerodynamic drag factors of liquid drop movement allows using the obtained formulas for calculating  hydraulic vortex coagulation in a wide range of the Reynolds number, 1 < Re < 104. For enhancing energy of high-head hydraulic dedusting, the mathematical model and technology of hydro-vortex dust collection are proposed. The similarity criteria and indicators of the hydro-vortex dust collection efficiency are obtained. The experiments prove that dedusting efficiency depends not on the fluid flow rate but on the energy of dynamic head of liquid drops and on their dispersion degree. The hydro-vortex dust collection technique allows enhancing the dust control efficiency up to 99 % owing to the increased rotational velocity of liquid drops.