SU1613637A1 - Mine airing network - Google Patents

Abstract

The invention relates to the mining industry and can be used to ventilate mines for the extraction of minerals by underground mining. The goal is to increase the efficiency of the mine ventilation network (MWS) by ensuring uniform distribution of clean air between the blocks. To do this, the PWS includes a central air supply trunk 1 connected to the cleaning units (OA) 4 through the workings (B) 2 of the haulage horizons and rising 3 that serve to supply fresh air to the O 4. with ABOUT 4 through the assembly vent line 7 and B 6 for removal of harmful gases and dust from each AB 4. In this case, B 6 are made in the form of V-shaped air-conducting fittings. The assembly vent 7 is made in the form of two truncated conical flank channels 10 connected by their smaller bases to a central channel of constant cross section. The ratio of the cross-sectional areas of the flank channels 10 along their length from the smaller section to the larger d. equal to 1/5 - 1/10. This allows you to observe the equality of the depression and the speed of air movement along the entire length of the BHA assembly drift with a large number of OB 4. 1 Cp f-crystals, 2 ill.

Description

This invention relates to a mountain pro; mind and can be used for ventilation of mines in the mining of minerals by underground mining.

The aim of the invention is to increase the efficiency of the mine ventilation network by ensuring an even distribution of air between the blocks.

FIG. 1 shows the mine ventilation network, general view; in fig. 2 is a diagram of the assembly ventilation drift during the experiment.

The mine ventilation network contains a central air supply trunk.

1, generation of haulage horizons 2 and revolting 3, serving to supply fresh air to the cleaning units 4, flank ventilation shafts 5, through which exhaust air is vented. The ventilation network of the cleaning units is connected by openings 6 for removal of harmful gases and dust from each cleaning unit, made in the form of V-shaped air-conducting failures, with an assembly ventilation drift 7, which is connected with an air supply drift 9 and flank ventilation shafts 5. The assembly ventilation drift 7 is made in the form of truncated cones

SA) ABOUT CJ XI

shaped flanking channels 10 connected by their smaller bases to the central channel 11 of a constant cross section. The ratio of the cross-sectional areas of the flanking channels 10 along its length from a smaller section to a larger one is assumed to be 1/5 - 1/10, which allows to observe the equality of depression and air velocity along the entire length of the assembly drift with a large number of cleaning units. The selection of the ratios of the sections of the assembly vent is made on the basis of specific mining conditions depending on the number of cleaning units and the estimated air flow rates necessary for their ventilation.

The mine ventilation network operates as follows.

Fresh air is fed through the central air supply shaft 1 to the main and overlying refined horizons, and then through the workings of haulage horizons 2 and rising 3, it is directed to the refining blocks 4. The air from the air drift 9 is fed to Airing the ore output chambers and the air from the overlying horizon rises in a downward direction to the sub-floors and cleaning units 4 to ventilate drilling and transport operations during normal operation of the mine and to remove harmful gases and dust and after the production of massive explosions. Harmful gases and dust are removed from the cleaning units 4 through V-shaped sleeves 6 to the assembly ventilation drift 7, and then through the sledge 8 and the flanged ventilation shafts 5 to the atmosphere. As the air moves along the assembly drift, its amount increases from Omin in the center to Omax on the flanks of the drift and depends on the number of cleaning units 4.

The magnitude of the depression of the assembly drift on its length from the center of the field to the flank is determined from the expression:

il, ii,

where hi is the depression of the 1st section of the roadway; n is the number of series-connected sections; oj is the aerodynamic drag coefficient of the 1st drift section; PI, Li, Si - perimeter, length and cross-sectional area v (workings of the 1st section; Qi - air flow on the 1st section.

In connection with the increase in air flow along the length of the assembly drift from the center to the flanks (Qi Qa ... Qn) to maintain an approximate equality of depressions on these

ten

15

20

25 40

e

thirty

35

45

0

in the plots (hi 2 ... hn) it is necessary at a constant value of the coefficients to reduce the aerodynamic drag Ri with iPiLi / Si. By increasing the cross-sectional area in each of the subsequent sections of the assembly drift, the required reduction of their aerodynamic resistance can be achieved, and the inequality (RI Ra ... Rn) is observed. An increase in the cross section in subsequent sections should correspond to an increase in the amount of air entering these areas, which is consistent with the design of the assembly ventilation drift and the principle of its operation.

Example. An aerodynamic model of a shaft ventilation network was built on a scale of 1:30 (FIG. 2), which contained air supply and ventilation shafts, haulage and rising production to supply fresh air to the cleaning units (not shown), assembly ventilation drift 7, connected with a system of workings 6 for the removal of harmful gases and dust. The sole of the assembly ventilation drift 7 was designed in such a way that it could move inside the side walls by pivoting at the point A of its central part.

By moving the base of the assembly drift inside the side walls from position 1-1 to position 11-11, it was possible to change the section of the assembly drift from constant (position M) to the required variable value (position 11-11). The dimensions of the side walls allow changing the ratio of sections in the center and on the flanks of the drift from m 1/1 to m 1/8.

The mine ventilation network contained eleven refining blocks: one was located in the center and five on the flanks of the network. In the initial position (1-1), with a constant cross-section of the assembly ventilation drift (), created by the fans at the drift length 7, it was 140 dpa. and in position 11-I, which corresponds to the ratio of the cross sections m 1/18, the depression decreased to hm 4 daPa.

Claims (2)

Claim 1, a mine ventilation network comprising a central air supply trunk connected to the cleaning units through the development of haul horizons, and rising, flanking ventilation shafts connected to the cleaning units through the assembly ventilation strip and generation to remove harmful gases and dust from each cleaning unit, characterized in that, in order to increase the efficiency of the shaft ventilation network, by ensuring an even distribution of clean air between the blocks, the assembly ventilation drift is made in the form of two truncated cone-shaped flank channels connected by their smaller bases to the central channel of a constant cross section, and the workings for the removal of harmful gases and dust of each cleaning unit are V-shaped. 2. The ventilation network under item 1, characterized in that the ratio of the areas of the cross sections of the flank channels along its length from the smaller section to the larger should be equal to 1 / 5-1 / 10. I. BUT Phia.1