Method for methane emission control in mining face

FIELD: mining industry, particularly methods or devices for drawing-off gases.

SUBSTANCE: method involves taking methane concentration in characteristic mining face points by sensors, wherein the characteristic points are selected in accordance with requirements fixed by Safety Rules; recording and processing methane sensor readings in central station; transmitting the methane sensor readings to signal receiving block; performing primary processing of the received signals and de-energizing bottomhole mechanisms; inputting safety factor, namely maximal value of gaseous methane content, which is less than critical methane concentration value and takes into consideration response time of methane emission control system; automatically forming commands aimed at cutter-loader output regulation by reducing or increasing speed of cutter-loader feeding if one sensor detects methane concentration reduction or growth from zero to maximal value after the received signal processing to provide safe operation in the mining face until critical methane concentration is reached in mining face atmosphere without bottomhole mechanism de-energizing. If above methane emission control system can not provide maximal methane content in mine face atmosphere the system will de-energize all bottomhole mechanisms with taking into consideration of response time of methane emission control system.

EFFECT: prevention of critical explosive methane concentration in mine without bottomhole mechanism operation stoppage.

1 dwg

 

The invention relates to the mining industry and is designed to create safe working conditions in the mining face.

Known gas-analyzing system of mine multifunctional "Mikon IP". It provides automatic gas control (ASC), automatic gas protection (AHP), as well as the exchange of information with the dispatching, information processing, its reflection and storage (Automated control of the mine atmosphere AKMR-M /Coal. - 2003. No. 10. - p.33. , Smolensk, act "Analitpribor").

A disadvantage of the known system is recording only the critical content of methane gas in the characteristic points of the stope and the power from all of the mechanisms and electrical equipment installed in zone stope, which entails:

- power outages delayed in time relative to the formation of a critical situation that, in General, does not exclude the possibility of hazardous situations;

- full stop stope for a long time to reduce the concentration of methane gas to a certain safe value, i.e. drastically affects the performance of the stope.

There is also known a method of gas protection that formed the basis of an automated system for monitoring of the mine atmosphere AKMR-M (Lapin IS ABOUT nasienie mines automated systems modern level / Escapin, Bijasowice // Coal. - 2003. No. 11. - P.30-32).

The complex provides:

- continuous automatic monitoring of methane, carbon monoxide and oxygen in the mine atmosphere, and an indication of the speed of the air flow in the mine;

- protective switch off the power supply of mining equipment and issuing signals when reaching the limit value of the volume fraction of methane (automatic gas protection - AHP);

- delivery of signals when reaching the limit value of the volume fraction of carbon monoxide and oxygen;

- collecting and processing information about the state (enabled/disabled) of the technological equipment of the test object (mine);

- transmission of information to the dispatch point, processing and reflection.

The disadvantage of this method, as above, is fixed only critical content of methane gas in the characteristic points of the stope and disconnect power from all machinery and electrical apparatus installed in the area of the stope, which entails:

- power outages delayed in time relative to the formation of a critical situation that, in General, does not exclude the possibility of hazardous situations;

- full stop stope for a long time to reduce the concentration of gas IU the Ana to a certain safe value, i.e. drastically affects the performance of the stope.

The purpose of the invention is the avoidance of the creation in mining face critical (hazardous) concentration of methane gas without stopping operation of the downhole mechanisms.

This goal is achieved by the fact that:

1. The method of controlling metanavigation in a mining face, including fixing by means of sensors methane critical concentration of methane gas in the characteristic points of the stope, regulated by the requirements of the IB, and the power to downhole mechanisms, characterized in that to produce the collection and processing of sensor values of methane Central station and then transfer sensor data to the receiving unit signals, and then after the initial processing to produce a signal shaping unit commands (which, in automatic mode executes commands governing the performance of the Shearer).

2. The method according to claim 1, characterized in that the system enter the coefficient of reserve security - the value of the maximum content of methane gas that is smaller than its critical value and provide a safe work stope before reaching the critical value of gas emission in the atmosphere stope without disconnecting electrical power downhole mechanisms by regulating soon the STI Shearer.

3. The method according to claims 1 to 2, characterized in that the ratio of reserve security takes into account the inertia of the system.

If, for objective reasons, the scheme will not be able to provide the maximum content of methane gas in the atmosphere stope, it will shut off power to downhole mechanisms taking into account the inertia of the system.

The drawing shows a control circuit metanavigation in a mining face by the claimed method.

Where x=x1...xn(xxyz-- with - system required sensors controlling all the parameters of the air-gas environment in mines regulated by the requirements of the IB (Rules of safety in coal mines. PB 05-618-03. Issue 11. - 2003. - S.293. - M.: Gosgortekhnadzor of Russia; STC "Industrial safety");

y1-y2-y3-y4the communication channels between the main blocks of the system;

Y - Central station collection and testing of sensors;

Z - receiving block signals from the Y, and their primary processing;

V - block formation;

W - feeding mechanism of the Shearer;

With Shearer.

The proposed scheme according to the claimed method control metanavigation in a mining face is as follows:

upon detection of one of the sensors (x) changes in the concentration of methane in the lower or upper side (from 0 to a four-s is the value of the information communication channel y 1arrives at the Central station Y collecting and processing sensor data, recognize it, and then this information over the communication channel y2arrives at the receiving unit Z, where after processing the information on the communication channel y3goes to the block V formation, then the communication channel y4is supplied to the feed mechanism of the Shearer With, where there is a decrease or increase the feed speed of the Shearer.

Thus, the claimed method control metanavigation in a mining face makes it possible to automatically analyze the state of the gas situation in certain regulated points of the stope, and by changing the speed of the Shearer, i.e. its performance, to avoid the intense methane of the main sources of metanoobrazovanie and exclude critical concentration of methane gas in the atmosphere stope and, thereby, to secure continuous continuous time operation of the Shearer.

If for some objective reasons, the scheme will not be able to provide the maximum content of methane gas in the atmosphere stope, it will shut off power to downhole mechanisms taking into account the inertia of the system itself, provides the failure above a critical value content of methane gas.

The method of controlling metanavigation in a mining face, including fixing by means of sensors methane concentration of methane gas in the characteristic points of the stope, regulated by the requirements of the safety Regulations, the collection and processing of sensor values of methane Central station, the transmission of sensor readings of methane to the receiving unit signals, the primary processing of received signals and power from a downhole mechanisms, wherein introducing the coefficient of reserve security - the value of the maximum content of methane gas that is smaller than the critical value, taking into account the inertia of the control system metanavigation, and when it detects one of the sensors changes the values of methane concentration in the lower or higher side of zero to the maximum value after the initial processing of received signals in automatic mode the unit formation will form teams on the modulation of the Shearer by reducing or increasing the feed speed of the Shearer ensuring safe operation of the stope before reaching the critical value of methane concentration in the atmosphere stope without disconnecting electrical power downhole mechanisms.



 

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