Науковий вісник НГУ

Theoretical substantiation of dynamical parameters of impulse injection of a fluid into a coal bed

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Category: Mining

Last Updated on 14 July 2013

Published on 14 November 2012

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Authors:

Yu.A. Zhulay, Cand. Sci. (Tech.), Institute of Transport Systems and Technologies of National Academy of Sciences of Ukraine, Leading Research Scientist, Dnepropetrovsk, Ukraine

A.A. Angelovskiy, Public Joint-Stock Company “Krasnodonugol”, Chief Executive Officer, Krasnodon, Ukraine

D.L. Vasilyev, Cand. Sci. (Tech.), Institute of Geotechnical Mechanics of National Academy of Sciences of Ukraine, Research Fellow, Dnepropetrovsk, Ukraine

Abstract:

Hydro-breakage is one of basic methods of prevention of the gas-dynamic phenomena during underground mining. The N.S. Polyakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine together with PAO “Krasnodonugol” works on increasing of efficiency of hydro-breakage by the method of pulse mode liquid infusion. Maximal scope of auto-vibrations of pressure of liquid superimposed on backup value corresponds approximately to the pressure of injecting. It confirms the possibility of the effective use of the created device for the pulse liquid infusion in the complex of mining equipment for hydro-breakage of coal layers.
Purpose. To determine efficient values of pressure impulses and frequency of their passage and hydrodynamic influence on a coal layer.

Methodology is based on the experimentally set laws of correlation between coal strength and speed of deformation, allowing determining of rational values of frequencies of hydraulic pressure impulses.

Findings. The experimental working points of the device for the impulsive injection of liquid in a coal layer at the change of pressure of backup in a borehole in the range from 3.1 MPa to 14.4 MPa and at pressure of injecting of 21,9 MPa were represented. Experimental information was received during measuring of pulsations of pressure on the distances 0,5; 1,0; 1,5 and 2,0 meters from hydro-impulse device. The parameters of the dynamic pressure of coal layer by means of impulsive hydro-breakage correspond to the terms of theoretical dependences of rational frequency of the passing impulses from the value of pressure impulse. Working points of the device, as a rule are higher than theoretical dependences.

Originality. Hyperbolical dependences of efficient frequency of the passing of hydraulic impulses on the value of their pressure were set for the first time. Comparison of these dependences with operating parameters of the device for the impulsive liquid infusion in a coal layer was carried out.

Practical value. Consideration of the mentioned dependences allows establishing of the rational dynamic parameters of hydro-impulse device satisfying the following requirements:
1. The values of the impulses of pressure, created by the device, must reach 2–10 MPa.
2. Frequency of the passing of pressure impulses must be in the range 1–7 kHz.

References:

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