Науковий вісник НГУ

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

• 
• 

User Rating:  / 0

PoorBest 

Details

Category: Mining

Last Updated on 14 July 2013

Published on 14 November 2012

Hits: 4355

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:

1. Пат. 87038 Украина, МКИ Е21F 5/02. Устройство для гидроимпульсного воздействия на угольный пласт / Л.М. Васильев, Ю.А. Жулай, В.В. Зберовський, П.Ю. Моисеенко, Н.Я. Трохимец; заявитель и патентообладатель ИГТМ НАН Украины. –опубл.10.06.09, Бюл. № 11.

Vasilyev, L.М., Zhulay, Yu.A., Zberovskiy, V.V., Moiseyenko, P.Yu. and Trokhimets, N.Ya. Ustroistvo dlya gidroimpulsnogo vozdeistviya na ugolnyi plast [Device for Hydro-Impulse Influence on Coal Layer], Pat.87038 Ukraine, MKY Е21F 5/02, declarant and patent holder IGTM NAN of Ukraine, published on June 10, 2009, Bull. No.11.

2. Жулай Ю.А. Решение концептуальных задач гидроимпульсного рыхления выбросоопасных угольных пластов в режиме периодически-срывной кавитации / Ю.А. Жулай, В.В. Зберовский, // Сборник научных трудов НГУ – Днепропетровск, 2011.– № 35 т.2. – С. 246–253

Zhulay, Yu.A. and Zberovskiy, V.V. (2011), “Solution of Conceptual Tasks of The Hydro-Impulse Breakage of Coal Layers with Burst Hazard in the Mode of Periodically Disruptive Cavitation”, Collection of the scientific papers of National Mining University, Dnepropetrovsk, vol.2, no.35.

3. Зорин А.Н. Механика разрушения горного массива и использование его энергии при добыче полезных ископаемых / Зорин А.Н., Халимендик Ю.М., Колесников В.Г. – М.: ООО Недра-Бизнесцентр, 2001.– 413 с.: ил. – ISBN 5-8365-0062-2

Zorin, А.N., Khalimendik, Yu.M. and Kolesnikov, V.G. (2001), Mekhanika razrusheniya gornogo massiva i ispolzovanie ego energii pri dobyche poleznykh iskopaemykh [Mechanics of Destruction of Rock Massif and Use of Its Energy During Mining], Nedra-Biznestsentr LTD, Moscow, Russia.

4. Васильев Л.М. Научные основы процесса и создание технических средств нагнетания жидкости в угольные пласты для борьбы с вредными явлениями в шахтах: автореф. дис. доктора техн. наук: специальность 05.15.11; 05.05.06 / Васильев Леонид Михайлович. – Днепропетровск, 1985. – 307 с.

Vasylyev, L.M. (1985), Nauchnye osnovy protsessa i sozdanie tekhnicheskih sredstv nagnetaniya zhidkosti v ugolnie plasti dlya borbi s vrednimi yavleniyami v shakhtakh [Scientific Bases of the Process and the Creation of Hardware for Fluid Infusion into Coal Layers for the Harmful Phenomena Control in Mines], Abstract of Dr. Sci. (Tech.) dissertation, Dnipropetrovsk, Ukraine.

5. Мохначев М.П. Динамическая прочность горных пород / М.П. Мохначев, В.В. Присташ. – М.: Наука, 1982. – 142 с.

Mokhnachev, M.P. and Prystash, V.V. (1982), Dinamicheskaya prochnost gornykh porod [Dynamic Strength of Rock], Nauka, Moscow, Russia.

6. Лодус Е.В. Влияние скорости деформирования на прочность и хрупкость удароопасных углей и каменной соли / Е.В. Лодус, С.Л. Романовский // Горное давление и горные удары. – Л.: ВНИИ горн. геомеханики и маркшейд. дела, 1976. – сб. 99. – С. 151–154.

Lodus, Ye.V. and Romanovskiy, S.L., (1976), “Influence of speed of deformation on strength and fragility of high outburst coal and salt beds”, Gornoe davlenie i gornye udary, no.99, pp. 151–154.

zhulai
2013-07-14  433.55 KB  1396

• < Prev