RU2557022C1 - Method of determination of coal mass gas content in zone of its destruction - Google Patents

Abstract

FIELD: instrumentation.

SUBSTANCE: invention relates to mining, mainly to coal industry. Method is suggested to determine gas content of the coal mass in zone of its destruction, including the shift-based working hours of the coal production cut face, course treatment by the longitudinal straps, measurement of intensity of gas evolution from the treated course per the production shift, and determination of the index of intensity rise of the gas evolution to the face space of the longwall face during the coal destruction. At that the intensity of gas evolution from the course is measured during removal of the first and second coal straps after the repair shift, at that the gas content of the coal mass in the zone of its destruction is determined as per the provided mathematical expression.

EFFECT: suggested method ensures determination of the reliable value of the gas content of the coal mass in zone of its destruction due to the direct measurements of the intensity of gas evolution from the course in the face space.

Description

The invention relates to mining, mainly to the coal industry, and can be used to determine the gas content of a coal mass in the zone of its destruction, followed by a forecast of the intensity of gas evolution into the bottom hole of the lava.

A known method for determining the gas content of a coal mass in the area of its extraction, including the use of the natural gas content of the formation, its degassing coefficient and formulas for calculating the desired value (Ruban A.D., Zaburdyaev BC Assessment of the degassing efficiency of developed coal seams. Coal, 2010. - No. 11 . - S. 8-10).

The disadvantage of this method is that in the calculation formula, the natural gas content of the formation and its degassing coefficient are used, which require special methods and time to determine them.

A known method for determining the gas content of a coal mass in the zone of its extraction, including the use of the predicted gas generation in the bottomhole space of the lava, productivity of the extraction machine and the residual gas content of coal issued from the lava (Preparation and development of high-gas coal seams: Reference manual / Ed. A. D. Ruban, MI Shchadov. - M.: Publishing House "Mountain Book", 2010. - 500 p., Pp. 134-138).

The disadvantage of this method is that they use the predicted amount of gas evolution, and not the actual, and the residual gas content of the coal emitted from the lava, the determination of which requires special measures and time.

The closest is a method for determining the gas content of a seam in a removable strip (run-in), including the shift work of a coal face for coal mining, measuring the intensity of gas release from a coal seam into the bottomhole space of a lava at a given productivity of a mining machine, and calculating the gas content of a seam in the coal extraction zone using the formula in which use the values of the permissible intensity of gas evolution in the face, the productivity of the machine and the residual gas content of coal emitted from the lava (Problems of ensuring of high productivity of treatment faces in methane-rich mines / A.D. Ruban, V. B. Artemyev, B. C. Zaburdyaev et al. - M: URAN IPKON RAS, 2009. - 396 s, prototype, p. 128-130).

The disadvantage of this method is that in the calculation formula, the gas emission allowable for gas in the working face and the residual gas content of coal emitted from the lava, which is determined by special methods for a sufficiently long time, are used.

The aim of the invention is to determine the reliable gas content of the coal mass in the zone of its destruction due to direct measurements of the intensity of gas evolution from the formation into the bottomhole space of the face.

According to the invention, the goal is achieved by the fact that in the method for determining the gas content of a coal mass in the zone of its destruction, which includes a changeable working mode of a coal face for coal mining, working the formation with longitudinal stripes, measuring the gas release rate from the produced formation into a production shift, and setting an increase rate of gas evolution in the bottom hole lava space during the destruction of coal, the intensity of gas evolution from the formation is measured during the extraction of the first and second bands of coal after repair of the shift, while the gas content of the coal mass in the zone of its destruction is determined by the formula, including the intensity of gas evolution from the mined seam during excavation of the first and second bands of coal after the repair shift, the rate of increase in time of the gas evolution from the destroyed coal mass and the productivity of the excavation machine for destruction coal mass in the mining shift.

The method is as follows.

In accordance with the regulatory document, the length of the zone of gas drainage of the formation contouring the lava workings is established in accordance with the regulatory document on the area of the coal seam prepared for mining using mechanized lining and a cleaning excavation machine. Air-gas surveys are carried out in the bottomhole space of the lava in order to measure the intensity of gas evolution from the mined seam and to establish the rate of increase in the rate of gas evolution into the bottomhole space of the lava during coal destruction.

Gas-air surveys are carried out in a standard way or use the results of air-gas control of the bottomhole space of a lava in accordance with the current instruction on air-gas control in coal mines.

The intensity of gas evolution from the formation is measured during the extraction of the first and second bands of coal after a repair shift, while the gas content of the coal mass in the zone of its destruction is determined by the formula

$$X_{\mathrm{at}}=\frac{I^{″}-I^{\prime }}{Kj},$$

where X _in - the gas content of the coal mass in the zone of its extraction (destruction), m ³ / t SBM;

и $$I^{″}$$

- интенсивность газовыделения из отрабатываемого пласта во время выемки соответственно первой и второй полос угля после ремонтной смены, м³/мин; $$I^{\prime }$$

and $$I^{″}$$

- the intensity of gas evolution from the mined seam during the extraction of the first and second bands of coal, respectively, after a repair shift, m ³ / min;

K is the indicator of the increase in time of the intensity of gas evolution from the destructible coal mass;

j is the productivity of a mining machine for the destruction of a coal mass into a mining shift, t / min. Measurements of the intensity of gas release from a coal seam are made in the middle part of the lava beyond the degassing effect of the outcrops that contour the lava. The rate of increase in time of gas evolution intensity is determined by its measured values during coal destruction as the slope of the dependence of the intensity of gas evolution from the formation during coal extraction on the productivity of the coal-mining excavation machine.

The implementation of the method will allow you to have a reliable value of the gas content of the coal mass in the zone of its destruction and determine the rational flow rate of air flowing along the bottomhole space of the lava, to ensure normative indicators of the mine atmosphere both in the lava and in the excavation area.

Claims (1)

A method for determining the gas content of a coal mass in the zone of its destruction, including a shift mode of a coal face for coal mining, working the formation with longitudinal stripes, measuring the intensity of gas evolution from the produced formation into a mining shift, and setting an increase rate of gas evolution into the bottomhole space of the lava during coal destruction, characterized in that the intensity of gas evolution from the reservoir is measured during the extraction of the first and second bands of coal after the repair shift, while the gas content of the array la in its destruction zone is determined by the formula

where X _in - the gas content of the coal mass in the zone of its extraction (destruction), m ³ / t SBM;

and

- the intensity of gas evolution from the mined seam during the extraction of the first and second bands of coal, respectively, after a repair shift, m ³ / min;
K - an indicator of the increase in time of the intensity of gas evolution
from destructible coal mass;
j is the productivity of a mining machine for the destruction of a coal mass into a mining shift, t / min.