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Abstract

Content

Goals and objectives of master's work

Purpose of master's work – the development of potential measures to improve the safety of the people out of the zone of fire gases in fires in inclined workings with downward ventilation, developed through the use of a virtual model of mine ventilation network of the mine to them. Kalinin. Make an analysis of air distribution and ventilation scheme. To develop a computer model of the mine using the IRS Ventilation – PLA.

1. Relevance of topic

Obtained results allow to predict the conditions of rescue in case of accidents and to develop measures to improve the safety of miners.

In practice, evaluation of the stability of air flow is produced only with downward ventilation openings, and in those cases where ventilation is not stable, these include the development of society in the area of mine ventilation flow reversal. In the current conditions in some mines of Ukraine reversal zone extends to the excavation sites.

Analysis of the conditions of obscheshahtnogo reversal in underground fires shows that in some cases, there is a threat to rollover air flow and ventilation in the reverse mode. Calculations of the stability of air flow at fires in the mountains sloping excavations carried out on all coal mines in the preparation of emergency response plans. The basis of these calculations is determination of the thermal depression of fire and its actions in the simulation of mine ventilation network.

2. Probable scientific novelty

For the first time an assessment of stability using four different methods for determining the resistance of short-circuiting path:

Based on these in the master's work results will be compared and the conclusion as to which of these methods is most accurate.

Technology problem solving mine ventilation with complex software IRS Ventilation - SSN, is defined by a sequence of actions, including the stage of preparing the initial information. At this early stage, it is necessary to prepare a scheme of ventilation shafts before putting it into the computer. The peculiarity of this training is to apply the scheme of ventilation in the form of a sequence (network) connected between each other, branches. Each node of the network links between them, two or more output (branches), or part of production, as a rule, the coding schemes of ventilation is carried out in preparing the mine to the depression survey. In this case each node and branches in the diagram is assigned a certain number (Fig. 1).

Figure 1

Figure 1 – Simplified diagram of the field gradient
(1 – vozduhopodayuschy drift, 2 – upper sboyka 3 – walker, 4 – bias)

This allows us to identify the numbering of all production of the mine or part thereof and to determine the actual direction of movement of air in them. In preparing the scheme of ventilation shafts, to represent it in electronic form, shall be its simplicity. Under the simplification implied association of multiple nodes in a network of ventilation or view on the scheme of ventilation, the serial connection of several workings of one branch (Fig. 2).

Figure 2

Figure 2 – Simplified diagram of the external leakage paths and installation of fan

The need for such a detailed representation of the scheme of ventilation in the computer due to the fact that the series connection of workings may be areas with different angles and geometrical parameters, which form a variety of conditions for the development of fire and movement of people. In simplifying the ventilation circuit, when several nodes, which are places of conjugation (connection) mining, are replaced by one (contract), are also possible errors in the construction of the zone of fire gases, the best routes of movement of persons and modeling effects of heat sources traction (natural draft, the thermal depression is a fire).

To ensure the sustainability of ventilation must be installed to control the resistance of the branch 1.0 kMyurg 18 (second haulage drift eastern horizon 1200 m). After installing the control reversal does not occur (Fig. 5). In Fig. 6 demonstrated the situation of a fire in a model of the Kalinin mine.

Figure 5

Figure 5 – Area zagazirovaniya after amplification ventilation

Figure 6

Figure 6 - Simulation of a fire in a branch # 125 computer model of the mine to them. MI Kalinin
(Animation: 6 frames, 6 cycles of repetition, 65 kilobytes)
(Blue color – its original state, yellow color - zone spread of fire gases to rollover air flow, the color blue – zone of fire gases spread after breaking air flow, the color red – branch in which there is a fire)

Conclusion

Current status of coal mines in Ukraine is characterized by complex economic and geological conditions. Increased depth of mining, which leads to an increase in air temperature, the deterioration of the environment and maintain the mine workings. Security schemes of ventilation decreases due to increasing the length of mine workings. In these circumstances, the question of ventilation of coal mines acquire special weight. They have a direct connection with occupational safety and their solutions at the present level is the key to improving safety.

In the past twenty years has spread the use of simulation software of ventilation network of coal mines. These software packages allow you to automate a number of issues related to prediction and control of air distribution in mine ventilation networks, as well as preparing and maintaining emergency response plans.

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