RU2268365C1 - Method for methane emission control in mining face - Google Patents

Abstract

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

Description

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

Known gas analytical mine system multifunctional "Micon IP". It provides automatic gas control (AGK), automatic gas protection (AGZ), as well as information exchange with a control center, information processing, its reflection and storage (Automated complex for monitoring the mine atmosphere AKMR-M // Coal. - 2003. - No. 10. - p. 33. Smolensk, SPA "Analitpribor").

A disadvantage of the known system is the fixation of only the critical methane gas content at the characteristic points of the face and the blackout from all mechanisms and electrical devices installed in the zone of the face, which entails:

- power outage with a delay in time regarding the formation of a critical situation, which in general does not exclude the possibility of an explosive situation;

- a complete stop of the working face for a long time until the methane gas concentration decreases to a certain safe value, i.e. dramatically affects the performance of the face.

There is also known a method of gas protection, which is the basis for the AKMR-M automated complex for monitoring the mine atmosphere (Lapin E.S. Equipment of mines with automated systems of a modern level / E.S. Lapin, B.I. Basovsky // Coal. - 2003. - No. 11. - S.30-32).

The well-known complex provides:

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

- protective shutdown of the power supply of mine equipment and the issuance of signals when reaching the maximum permissible values of the volume fraction of methane (automatic gas protection - AGZ);

- issuing signals when reaching the maximum permissible values of the volume fraction of carbon monoxide and oxygen;

- collection and processing of information on the status (on / off) of the technological equipment of the control object (mine);

- transfer of information to the control room, its processing and reflection.

The disadvantage of this method, as well as the above, is to fix only the critical methane gas content at the characteristic points of the face and disconnect the voltage from all mechanisms and electrical devices installed in the zone of the face, which entails:

- power outage with a delay in time regarding the formation of a critical situation, which in general does not exclude the possibility of an explosive situation;

- a complete stop of the working face for a long time until the methane gas concentration decreases to a certain safe value, i.e. dramatically affects the performance of the face.

The purpose of the invention is to prevent the creation of a critical (explosive) concentration of methane gas in the working face without stopping the operation of the bottomhole mechanisms.

The specified goal is achieved by the fact that:

1. The method for controlling methane emission in the face, including fixing the critical concentration of methane gas at the characteristic points of the bottom face regulated by the requirements of the slag through methane sensors and disconnecting electricity from the bottomhole mechanisms, differs in that they collect and process the indicators of methane sensors by the central station and the subsequent transmitting the readings of sensors to the receiving block of signals, and then, after their initial processing, transmit signals to the block forming commands (which th automatically executes commands that regulate the performance of the shearer).

2. The method according to claim 1, characterized in that the safety margin is introduced into the system — the maximum value of methane gas content is less than the critical value and ensure the safe working face until the critical value of gas evolution in the working face atmosphere without power outage downhole mechanisms by adjusting the feed rate of the combine.

3. The method according to claims 1 to 2, characterized in that the safety margin takes into account the inertia of the system itself.

If, for objective reasons, the scheme cannot provide the maximum methane gas content in the atmosphere of the face, then it will turn off electricity from the bottomhole mechanisms, taking into account the inertia of the system itself.

The drawing shows a control circuit methane in the face according to the claimed method.

Where x = x ₁ ... x _n (x _xyz ... s) is the system of necessary sensors that monitor all the parameters of the state of the gas-air environment in the mine workings, which are regulated by the safety requirements (Safety rules in coal mines. Safety rules 05-618-03. Issue 11. - 2003. - P.293. - M .: Gosgortekhnadzor of Russia; STC "Industrial Safety");

y ₁ -y ₂ -y ₃ -y ₄ - communication channels between the main units of the system;

Y is the central station for collecting and testing sensor readings;

Z is the receiving block of signals from Y and their primary processing;

V - block forming teams;

W is the feed mechanism of the shearer;

C - shearer.

The proposed scheme for the claimed method for controlling methane release in the face works as follows:

when one of the sensors (x) detects a change in the methane concentration to the lower or higher side (from 0 to the maximum value), the information on the communication channel y ₁ goes to the central station Y for collecting and processing sensor readings, recognizes it and then this information on the communication channel y ₂ arrives at the receiving unit Z, from where after processing the information on the communication channel y _{3 is} fed to the block V of the formation of commands, then through the communication channel y _{4 it is} fed to the feed mechanism of the shearer C, where there is a decrease or increase in the feed rate Wow harvester.

Thus, the claimed method for controlling methane release in the face allows you to automatically analyze the state of the gas situation at certain regulated points of the face, and by changing the speed of the shearer, i.e. its performance, to avoid intensive methane release from the main sources of methane formation and to exclude a critical concentration of methane gas in the atmosphere of the face and, thus, ensure safe continuous non-stop operation of the shearer in time.

If, for some objective reasons, the circuit cannot provide the maximum methane gas content in the atmosphere of the face, then it will turn off electricity from the bottomhole mechanisms, taking into account the inertia of the system itself, i.e. ensures the achievement of above a critical value of the methane gas content.

Claims (1)

  A method for controlling methane emission in a production face, including recording methane gas concentrations through methane sensors at characteristic points of a production face regulated by the requirements of the Safety Rules, collecting and processing methane sensor readings by a central station, transmitting methane sensor readings to a signal receiving unit, initial processing of received signals and shutting down electricity from downhole mechanisms, characterized in that they introduce a safety reserve coefficient - the maximum value I, the methane gas content is less than the critical value, taking into account the inertia of the methane emission control system, and when one of the sensors detects a change in the methane concentration value from the bottom to the top to the maximum value after the initial processing of the received signals in automatic mode, the command generation unit commands to regulate the performance of the shearer by reducing or increasing the feed rate of the shearer, ensuring the safe operation of the shearer th bottom to reach a critical concentration of methane in the atmosphere of the bottom hole without turning off the electricity from the bottomhole mechanisms.