Abstract
Content
- 1. Actuality of theme
- 2. Probable scientific novelty
- 3. Short information about a mine
- 4. Programmatic system REVOD
- 5. Assessment of the status of ventilation of mines on the basis of depression shooting
- Conclusion
- References
1. Actuality of theme
The conduct of mountain works on deep horizons is related to complication of mining and geological conditions of development of coal beds, increase of methanes, temperature of containing breeds, dustiness of mine atmosphere and cost of maintenance of the mountain making. In addition, the height of production capacities of mines and sizes of the mine fields comes true in the conditions of concentration and intensification of mountain works. All of it hampers ventilation of coal mines considerably. Ventilation becomes one of factors, straight or by implication qualificatory parameters coal enterprises.
2. Probable scientific novelty
To work out the row of measures on perfection of ventilation of mine on the basis of dissection of defects in ventilation of mine, establishment of the actual state of the mountain making and vent building, estimation of the state of ventilators of main ventilation and parameters of their office hours on a mine vent network.
3. Short information about a mine
Mine the name of M.I of Kalinina of GP «DUEK» located on territory Donetsk – the Makiivka district of the Donetsk area of Ukraine and is in the Kalinina district Donetsk. Presently a mine is develop a layer – h10. A mine is attributed to dangerous on the sudden extrass of coal and gas [1]. Her absolute methanes – 16,6 m³/mines, relative methanes – 25,2 m³/t. the General extent of the operating mountain making is equal to a 59,3 km. Method of realization of the mountain making is drillings and blasting.
Figure 1 – Carrying out of the workings of drilling and blasting method: 1 – а boring machine; 2 – loading Elevator suspension; 3 – maneuver cart or electric locomotive
Mine field is opened five vertical trunks (crate №1, №2, № 3, skips and ventilation), as well as capital crosscuts on the horizons 229 m, 758 m and 1070 m. Method of preparation of a mine field - panel. System development is continuous.
Method of airing of mines – suction. The scheme of airing – combined. The ventilation of mines is carried out by two fan units of the main ventilation: VCD-47у on the East the ventilation shaft and VC-5 on skip the trunk. Fresh air into the mine is supplied by crate trunk № 1, on a crate trunk № 2 and crate trunk № 3. Outgoing stream of air in the Eastern ventilation trunk and skip the trunk is issued to the surface.
Depression shooting mining was carried out in III-IV quarter of 2010, the employees of the service depression surveys with the purpose of the analysis of the actual state of ventilation of mines and obtaining initial data for development of recommendations to improve it. Processing of the results of depression shooting was carried out with the help of a software system REVOD.
4. Programmatic system REVOD
Program system REVOD (Calculation of Natural air distribution and Processing of Depression capture) provides operational solution of the complex tasks of air distribution in mvn and focuses on the use of personal computers compatible with IBM PC.
System REVOD is a highly effective tool for engineers plots VTB coal mines and depression services VGSO in solving problems of analysis of condition of ventilation network and prospects of its development. The principal set of initial data for systems of REVOD is the list of branches and units WAN with an indication of their relationship, the aerodynamic resistance of the branches and the characteristics of the fans. Additional data (air temperature in the nodes of the network, methanes, taps, etc.) expand the functional set of the obtained solutions. For the effective formation of the initial data in the system is used, a special program of database management.
System REVOD allows you to:
- to carry out control of correctness of the initial data;
- to solve problems of natural air distribution in normal and in the reverse mode of airing for networks, belonging to 1400 branches;
- operatively to carry out the selection of an efficient modes ventilation of mines and separate workings in case of accidents;
- take into account the natural thirst;
- to carry out the calculation of energy consumption, on the objects of ventilation;
- determine the degree of influence of each VGP on the airing of practical workings;
- to carry out the calculation of the distribution of methane, carbon monoxide and other gases in the mine workings of the mine at the given source nicknames gas emissions;
- to determine the aerodynamic resistance of the specified branches with fixed costs of air;
- modeling of accidents in the mine ventilation system in the collapse of a mountain rocks and souffles allocation of gas;
- to analyze the stability of the ventilation network under normal occupational conditions of ventilation, by fires on the set of the heat new depression, for example collapse of rocks expression activities and the destruction of the ventilation installations;
- to assess the gas situation in the excavation sites in the application of the mode of airing and decontamination;
- to assess the danger of education layer of clusters methane and determine the maximum content of methane in the layers;
- to determine the maximum of the expected content of methane in the culde SAC when you develop a site with a repayment ventilation generation after the lava;
- to carry out the calculation of the explosive mixtures of combustible gases;
- to determine the temperature of the hearth of self-ignition of coal and the stage of the development of endogenous fire;
- to carry out the calculation of time gases methane deadlock production (after stopping the VMP) and the workings of excavation plot (after their isolation);
- carry out regulation of air distribution in the mine ventilation systems;
- to carry out the calculation of the values of thermal depressions in inclined and vertical mines;
- determine the presence in the network of the circulation circuits;
- recruit and use a graphics library char of fans;
- to quickly change network settings and perform comparable the calculation of the new version compared with the basic version;
- to perform the automatic shift of the baseline network for the option user-defined and etc.
The development of the system REVOD used a number of original solutions that deliver high performance and reliability of its work.
The system is equipped with a powerful and flexible service shell, simplifying the preparation of the initial data, adjustment parameters of the network, the solution of the tasks of air distribution and interpretation of the obtained results.
5. Assessment of the status of ventilation of mines on the basis of depression shooting
In the period of the depression in the shooting of mine received 259,3 m³/s air, while on the calculation of the [2] it was required to 140,7 m³/s, the supply of the mine settlement amount of air amounted to 184 %. In the network of the fan VCD-47у develop provided with air 233 %, in the network of the fan VC-5 138 %.
For groups of airing of the applicants in the mine air is distributed as follows:
- excavation sites – 18.9 m³/s (7% from entering the mine);
- the camera is 27.9 m³/s (11 % from entering the mine);
- supported generation – 146.2 m³/s (56 % from entering the mine);
- preparatory faces – 49,2 m³/s (19 % from entering the mine);
- internal leakage – 17.1 m³/s (7 % from entering the mine).
Shearer a plot of 1-th panel lava CPU solid h10 secured by the settlement air flow by 111 %, Qф = 18.9 m³/s (estimated flow of air is Qр = 17,0 m³/s).
Analysis of depressiongramma in the network fan VCD – 47у on a route through the 1-s panel lava CPU solid h10 (the length of the route 10209 m) showed that of 538,8 PA depression developed fan 109,3 PA, lost in the mines with fresh the air flow (l = 3795 m), in mines with the outgoing air (l = 6414 m) is lost 429.5 PA.
The greatest loss of depression were observed in the following mines:
- ventilation Walker 2nd Eastern lava CPU solid h10;
- ventilation Walker № 2 1-St Eastern lava;
- 3-rd East field hauling road solid h10;
- major field trips.
During the depression shooting was performed measurements of methane concentration in the outgoing stream excavation of the site and mines. The content of methane in the places of measurement does not exceed the norms of admissible psychiatric clinic.
For the period of shooting in the work was 1 Shearer plot – 1 panel Chapter CPU pl.h10. In the calculations was determined by the changes in costs of air in the lava (on a shearer division) while opening the doors of gateways within the vent area, for diagonal love – changed aerodynamic resistance determining the branches.
Analysis of the results of calculation shows that the airing of 1 panel lava CPU solid h10 by scheme 2-In-a-H-a-W (the upper part of the lava) is stable in air flow, but is not sustainable in the direction of air flow.
Airing 1 panel lava CPU solid h10 by scheme 2-In-W-n-W (lower part of the lava) is stable in air flow and direction.
Figure 2 – Scheme of airing branch of cleansing the slaughter of type 2-W-H-w-wt (2-type, partial dilution of impurities on the sources of discharge; In-subtype, the direction of issue outgoing streams of lava on the worked out space; H-class, independent ventilation; w- the subclass, the upward movement of air on a lava; wt-type, returns direction of fresh and outgoing air jet)
Figure 3 – Liquidation of the layer accumulations of methane with a circulation return ventilation
Taking into consideration the requirements of the Politburo, as well as to improve the sustainability of the scheme of airing excavation of the site must be equipped with a door locks, mechanical or electrical lock, preventing simultaneous opening doors in the lock, with the output of information on the situation of the doors on the mountain dispatcher (the operator of the PCA, UTAS) in the following mines:
- ventilation doors winches camera human carriage CPU solid h10;
- ventilation doors with human carriage of the Central field gradient square h10 at the second East air gate square h10;
- ventilation doors in the ventilation sboyke with the Central field of the slope at 2 East group air gate gor.1070 m square h10;
- ventilation doors in the ventilation sboyke with 1 East field road haulage solid h10 on human Walker square h10;
- ventilation doors in kvershlag number one on vent Walker 1 panel lava CPU solid h10. In the process of exploitation maintain the number of ventilation doors and the section of the openings in the gateways, set in the following mines:
- ventilation doors with human carriage of the Central field gradient square h10 at 2 East air gate square h10, n = 2, Spr.max = 1,6 m²;
- ventilation doors in the ventilation sboyke with the Central field of the slope at 2 East group air gate gor. 1070 m square h10, n = 2, Spr.max = 4.6 m²;
- ventilation doors in the ventilation sboyke with 1 East field road haulage solid h10 on human Walker square h10, n=2, Spr.max= 1,8 m²;
- ventilation doors in kvershlag number one on vent Walker 1 panel lava CPU solid h10, n = 2, Sпр.max = 3.2 m.
Figure 4 – Airing of the 1-St panel lava CPU solid h10 (red arrow marked by air for ventilation of the lava)
Сonclusion
After the implementation of the proposed activities in full, all the main objects of the ventilation will be provided with settlement air flow. The distribution of air in mountain developments will be better, at the expense of the reserve for the further development of mountain works, fans of the main airing will work in the zone of industrial use.
References
- Правила безопасности в угольных и сланцевых шахтах. – М.: Недра, 1986. – 387 с.
- Руководство по проектрованию вентиляции угольных шахт. – К.: Основа, 1994. – 312 с.
- Патрушев М.А. и др. «Совершенствование проветривания угольных шахт. Из опыта разработки и внедрения эффективных схем проветривания» Донцк, «Донбас», 1976. – 126 с.
- Инструкция по расчету количества воздуха необходимого для проветривания действующих угольных шахт. – М.: Недра, 1975. – 80 с.
- Ушаков К.З., Бурчаков А.С., Пучков Л.А., Медведев И.И. «Аэрология горных предприятий»: Учебник для ВУЗов, – М. :Недра, 1987.– 421 с.
- Депрессионная съемка шахты им М.И. Калинина, – Донецк, – 2010.