Block ventilation method for top slicing develoment system

FIELD: mining industry, particularly ventilation of mines or tunnels during bauxite deposit development.

SUBSTANCE: method involves supplying pure air from field haulage roadway through blind drift of transport horizon into ore rising one due to mine depression; feeding part of air from rising horizon in intermediate blind drift; directing remaining pure air in layered air supply drift and then to entry ways for venting thereof; removing contaminated air through previously developed entry ways in layered venting drifts arranged in exhausted space at deposit ground along the strike; directing contaminated air through venting rises arranged in exhausted space along block boundaries at deposit ground to field venting drift drilled under deposit ground along the strike at venting horizon level and blind drift of venting horizon to field venting drift; supplying pure air from intermediate blind drift to field rise and then to field venting drift through blind drift of venting horizon. Intermediate blind drift and field rise are adapted to evacuate miners in emergency conditions.

EFFECT: increased efficiency and miner's safety due to changing pure and contaminated air mass flow within the boundaries of the block.

3 dwg

 

The invention relates to the mining industry and can be used for ventilation units, in particular bauxite mines.

A known method of ventilation unit when the development system layer collapse /1/includes fresh air through mine depression of the haulage drift in the passed under the soil layer of the ore itself, where with the help of local ventilation fans with pipelines installed on fresh stream for the nearest from the working layer sublevel verslagen, it may be directed into the treatment of the faces of the benches. Remove contaminated air from Stopes on layering the roadway, the upper part of the orebody itself to the first sublevel of corsega connecting the ore itself with the field of ventilation raise boring from which the contaminated air enters the field ventilation tunnel ventilation horizon. Sublevel the crosscuts, in addition to from the nearest working layer, and the field of ventilation rising level haulage horizon is sealed by means of ventilation jumpers.

The disadvantages of this method of ventilation are increased capital and operating costs. Higher capital costs are caused by the necessity of penetration within the block a few sublevel of crosscuts, their hermetization is, apart from the nearest working layer sublevel of corsega. Increased operating costs caused by the need for ventilation Stopes benches by local ventilation fans with pipelines and, as a consequence, additional energy costs and the fast deteriorating ventilation pipes.

The closest technical solution to the claimed method is a method of ventilation unit when the development system layer collapse adopted for the prototype /2/that include fresh air from the haulage drift on rising (furnace), passed under the roof of a layer on the drift layer, from which the air enters the ventilation Stopes benches, and removing waste (contaminated) air ventilation layer to the drift layer and the vectors on the field of ventilation raise boring (Gesink) and then on the field of the ventilation drift.

The disadvantages of this method of ventilation are increased capital and operating costs, as well as the deterioration of sanitary-hygienic situation in the working area. Increased capital costs caused by the need for each layer of the reservoir ventilation drifts and sboc (vectors)connecting layer ventilation drifts with the field of ventilation raise boring (hasenkam. Increased operating costs caused by the need to overcome significant local aerodynamic resistance arising in the mating faces and layer ventilation drifts when rotating air streams (jets) 90° back-and-accurate scheme ventilation layer, when a fresh stream passes through the bed of the roadway, traveled along the layer and not adjacent to one side with a goaf and outgoing jet - layer air passage, passed through the formation. The deterioration of sanitary-hygienic situation in the area of wastewater treatment works is invoked by entering the workspace significant part of the eye-catching in the developed space due to the decay of the forest in the "mate" of carbon dioxide. In addition, the process of decay is accompanied by the release of a large amount of heat. All this leads to reduced oxygen, increased carbon dioxide in the air and increase the air temperature in the working space, which adversely affects the safety of miners. In addition, the lowering of atmospheric pressure will inevitably be accompanied by additional carbon dioxide from the goaf, which can lead to gas working space to concentrations above the maximum permissible the e values. Especially this risk increases with the dramatic lowering of the atmospheric pressure. This further reduces the safety of miners.

The aim of the invention is to increase the efficiency of the ventilation unit when the development system layer collapse, safety miners due to the change of the movement path of air flow fresh and polluted air within the unit and reduce local aerodynamic resistance workings.

This goal is achieved due to the fact that in the proposed method of ventilation block fresh air from the field of transport drift due to mine depression served by ORT transport horizon of the ore itself, layer air to drift in the treatment of the faces of the benches are working layer, and the contaminated air removed by exhaust previously benches and layer ventilation drifts located in developed area of soil formation along strike, block the ventilation raise boring located in the developed areas along the borders of the block of soil formation, field block ventilation passage, passed under the soil formation along strike-level ventilation horizon, ORT ventilation horizon field ventilation tunnel ventilation horizon. When this part of the fresh air is and the ore itself serves on the intermediate ORT, the field itself, where ORT ventilation horizon it is served on the field of the ventilation drift.

The invention is illustrated in the drawing, in which figure 1 shows a diagram of the preparation and of the ventilation unit when the development system layer collapse, figure 2 - section a-a in figure 1, figure 3 - cross-section B-B in figure 1.

The method is as follows.

The entire volume of air supplied to the aeration unit, at the expense of mine depression of the field haulage drift 1 served by ORT transport horizon 2 in the ore rising 3, from which part of the air flows in the intermediate ORT 4, and the remainder layer in the intake passage 5, where fresh air enters the ventilation Stopes benches 6. Polluted air from Stopes worked previously benches, assign to the layer ventilation drifts 7 placed in mined-out space in soil formation along strike, where he block the ventilation raise boring 8, located in the developed areas along the borders of the block of soil formation, field block air passage 9, passed under the soil formation along strike-level ventilation horizon, and ORT 10 ventilation horizon enters the field of ventilation drift 11. Fresh air from the intermediate ORT 4 arrives on n the left rising 12, where ORT 10 ventilation horizon it is served on the field of ventilation drift 11. Intermediate ORT 4 and the field itself 12 are designed for the evacuation of miners in an emergency.

The mining of the coal fields of Severouralsk mines produced blocks of size 100-120 m in the fall and 50-60 m along the strike of the seam with a field training. Airing longwall mining benches are made using local ventilation fans with ventilation pipelines installed prior to nearby excavation layer ventilation linkage connecting the intake of the ore itself with the field of ventilation itself, which has polluted the air field of the ventilation drift. Due to their small cross-section not exceeding 6.6 m2, intake ore itself when transporting the instrument in running the branch section 3-3,5 m2vent pipes are damaged. They also damaged and in bed drifts and benches during transportation of the fixing material, ore using a scraper winches, blasting in Stopes benches and planting of the roof. As shown by our measurements, leakage of air deflectors reach 25%. All this complicates or makes impossible the provision of longwall mining benches require the most amount of air causes long-airing Stopes. In addition, the small volume of fresh air supplied to the slaughter, does not provide timely destruction released from the goaf of carbon dioxide and heat, which leads to the deterioration of sanitary-hygienic working conditions of miners. Measurements in the conditions of mine "Cheremuhovskaya" JSC "severalpossible" showed that the content of carbon dioxide in a clearing space totals 1.3% at the maximum permissible concentration (MPC), equal to 0.5%, and air temperature plus 35°if valid - plus 26°C.

The use of the proposed method of ventilation unit when the development system layer collapse improves the efficiency of the ventilation unit, the safety of miners by increasing the supply of fresh air into the treatment of the faces of the benches, changing the paths of movement of fresh and contaminated air within the unit and to reduce capital and operating costs for ventilation.

In 2003, we have developed a program of experimental-industrial tests of new schemes of ventilation, which is aligned in Ekaterinburg Department of Gosgortekhnadzor of Russia. Permitted to carry out the pilot work in blocks 36 (horizon - 560 m) and 17 (horizon - 680 m) on mine "Cheremuhovskaya" JSC "severalpossible". This year experimental work will be completed.

Sources of information the

1. Reference mining case /edited Vagrancy, Asigliano, Iaeaieea. M.: Nedra, 1983. 816 S. (.VIII. 28, s-529).

2. Kulikov G.S. Handbook of ventilation for Junior technical supervision of mines. M: Gosgortekhnadzor, 1961. - 239 S. (RES, s).

Method of ventilation unit when the development system layer collapse, in which fresh air through mine depression served from the transport drift on ORT transport horizon of the ore itself, layer air to drift in the treatment of the faces of the benches are working layer, and the contaminated air removed by exhaust previously benches and forth on the field of ventilation drift, characterized in that the contaminated air vent field drift remove layer ventilation drifts located in developed area of soil formation along strike, block the ventilation raise boring located in the developed space on the limits of the block in soil formation and field block ventilation drift, passed under the soil formation along strike-level ventilation horizon and ORT ventilation horizon, and some fresh air from the ore itself serves on the intermediate ORT, and the rest in the layer of air supply drift, from the intermediate ORT fresh air comes the t on the field itself, where ORT ventilation horizon it is served on the field of the ventilation drift.



 

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