SU1550172A1 - Method of identifying blowers - Google Patents

Abstract

The invention relates to mining and can be used in the development of coal-bearing gas. The goal is to reduce the complexity and efficiency of the method. When mining operations are conducted, methane production is continuously measured after the end of the coal extraction cycle, not earlier than 1.5 and no later than 2.0 hours. In the first coal extraction cycles, the amount of outgassing from the output is determined by the methane production and the relationship between the upper methane output and volume of gas as a function. In subsequent cycles of coal extraction, the possible occurrence of the source of gas emission and its intensity are determined with the help of the established relationship with the help of the established relationship. The method has low laboriousness and high efficiency in detecting the souffle. 2 hp ff, 1 ill.

Description

The invention relates to the mining sector and can be used in the development of coal-bearing gas beds.

The purpose of the invention is to reduce the labor intensity and increase the efficiency of the method.

The drawing shows the dependence of the upper limit of methane I on the volume of gas emission G.

The method is carried out as follows.

Until the appearance of soufflum sources in the mine working, i.e. Until the exit to the zone of geological disturbances, the flow rate of methane from the excavation is continuously measured using industrial equipment in the outgoing jet.

coal for 7-10 digging cycles. From each diagram, the magnitude of the methane flow rate from coal I is determined at the time of the gas after - the production of the coal to the coal notch. The gas aftereffect time at the coal excavation is taken at 1.5-2 hours. From the same methane flow diagrams, the volumes of gas G determined from the output from the moment of completion of the coal extraction operation are determined. on the groove angle.

Establish the relationship between the upper limit of the flow rate of methane and the amount of gas from the mine in the form of the formula

SP

ate

-four

1HE

(G).

In the subsequent occurrence of the souffle in the mine bottom, it is determined by the methane flow rate I and the gas volume G with the help of the established interconnection, and at I (G) there is no souffle mine in the mine face. When I (G) in the mine working there is a souff p with intensity I 1-1,

with - -&

An example of a specific implementation of the method when conducting otkladnogo drift.

Before the release of the slaughter to the zone of geological disturbances, i.e. Before the occurrence of soufflaster in the bottomhole generation during 7 technological excavation cycles, the methane flow rate from the generation was continuously measured. Portable

ATV methane sensor head constantly

located at a distance of 30–40 m from the bottom of the drift. The development was carried out by the drilling and blasting method in the mode of competitive blasting with simultaneous excavation of coal and rock. From the diagrams of methane I production from coal mining, the gas after-working time at the coal mining area was assumed to be 1.5 hours. From the same diagrams for methane production, the gas release from the mine generation was determined 1.5 hours after the end of each excavation cycle.

Based on the totality of methane production rates ll and gaseous emissions fcl, the relationship between the methane production upper limit and the gassing volume in the form of formula (G) was established. Graphic image of this formula is shown in the drawing.

When conducting production in the zone of geological disturbance, the occurrence of souffle in the bottomhole was determined by the flow rate of methane from the production and the volume of gas released from the production for 1.5 hours after the end of the excavation. So, after the next excavation cycle, it was determined that the methane flow rate from generation at the received gas aftereffect at the coal extraction in 1.5 hours is 47. The amount of released gas from the production for the specified time, i.e. for 1.5 h, amounted to ts1, so the upper limit of the flow rate of methane is equal to 32 m / min (determined from the graph in Fig. 2). Since, then, in the development, the appearance of a soufflory source was determined.

0

0

five

thirty

35 40

50

nickname of gas emission with an intensity of 47-0, 15 m3 / min.

In one of the cycles it was determined that, 30 m3 / min, a m3. From the graph in FIG. 2 it follows that I 0.37. Since, the bottomhole generation does not contain a soufflary source of gas.

Thus, due to the use for the classification of gas emissions from the generation of the characteristics of the gas state of the mine, the possibility appeared without a direct inspection of the bottom. at low labor input, operatively, for 1.5-2 hours after the end of the excavation, determine the presence of the souffle in the working face.

Prompt, without the direct presence of people in the bottomhole, the identification of the souffle makes it possible to increase the safety of mining operations, as it makes it possible in a timely manner to develop measures to eliminate the consequences of the appearance of the souffle.

Claims (2)

1. A method for identifying souffles during excavation work, including the continuous measurement of methane production from generation before and during the occurrence of the souffle gas release source and determination of the characteristics of the souffle, characterized in that, in order to reduce the labor intensity and increase the efficiency of the process, In the first excavation cycles, before the occurrence of soufflary sources of methane I (m / min), the amount of gas released from the output of G (m) is determined and the relationship between the upper limit of methane production I6 and the amount of gas produced as a function of ( G), a occurrence of a soufflary source of gassing in the bottomhole is determined on subsequent cycles of coal mining on the rate of methane and the volume of gassing using the established interconnection, moreover, at IV: I & f (G), the bottom hole production is determined unsuflectively and, when f (G) is souffle dangerous, the intensity of the souffle is determined from the expression:. 2. A method according to claim 1, characterized in that the gas evolution volume is determined 1.5-2.0 hours after the end of the coal extraction cycle. &, M 20 ABOUT S ($ i Souffle US V / ttutf.