RU2278270C2 - Device for automatic explosion and fire localization in mine tunnel - Google Patents

Abstract

FIELD: mining, particularly prevention of fire spread over mine tunnel caused by methane-air mixture and coal dust explosion.

SUBSTANCE: device comprises flame sensor, interface block with trigger and explosion suppression block. Device additionally has control apparatus, which controls abnormal gas content in mine space, lower gas mixture explosive limit recording sensor, main cable, which connects lower gas mixture explosive limit recording sensor with control apparatus, compressed air cylinder, compressed air discharge regulator, which controls air discharge from the cylinder, air-blast wave control sensor, open fire detector, "3 OR" member, "2 OR" member. Outputs of flame sensor, air-blast wave control sensor, open fire detector are connected to explosion suppression block through corresponding "3 OR" member inputs. Outputs of lower gas mixture explosive limit recording sensor and air-blast wave control sensor are linked to compressed air discharge regulator inlet through "2 OR" member inputs.

EFFECT: increased efficiency of mine tunnel protection due to lower mine-air explosive limit control.

1 dwg

Description

The invention relates to the field of mining and can be used to perform the following functions:

1. protection of mine workings from the spread of fire and flame during the explosion of methane-air mixture and coal dust, as well as suppression of methane and coal dust explosions in the initial stage of their development by forcing the supply of flame-extinguishing substance to the zone of the ignition center on the path of the alleged propagation of fire and flame ;

2. the degassing of the controlled area of the mine from the possibility of methane explosion from an external igniter located in this zone;

3. the degassing of the controlled zone and the obstacle to the propagation of the flame of the shock wave of the explosion beyond this zone, as well as a decrease in the gas content in the controlled zone with a sudden release of gas from the coal seam;

4. localization of an open fire that occurred in a controlled area.

Known automatic devices for localizing explosions. The closest in technical essence to the claimed is a device [1], consisting of a flame sensor, a unit for interfacing with a starter, an explosion suppression unit.

Among the disadvantages of the known device is that it does not exclude a methane explosion in the controlled area, but only localizes the explosion propagating from an adjacent site.

In addition, the device does not localize an open fire that occurred in a controlled area.

The purpose of the invention is to increase the protection efficiency of the controlled zone by controlling the lower explosive limit of the mine atmosphere, followed by forced outgassing of the gas contaminated zone by supplying compressed air under pressure, as well as by controlling an open fire in this zone with subsequent localization of the open fire due to the forced supply of flaming agent to controlled mining area.

This goal is achieved in that the device for automatic localization of explosions and fires in mine workings, including a flame sensor 1, an interface unit with a starter 2, an explosion suppression unit 3, characterized in that an apparatus for monitoring the emergency gas contamination of space 4, a lower limit fixation sensor are introduced the explosiveness of the gas mixture 5, the main cable 6, connecting the sensor for fixing the lower limit of the explosiveness of the gas mixture with the apparatus for monitoring the emergency gas contamination of the space, cylinder with compressed air 7, p a walker 8 for discharging compressed air from a cylinder, a shock wave control sensor 9, a fire sensor 10, an “3 OR” element 11, an “2 OR” 12 element, the outputs of a flame sensor 1, a shock wave control sensor, an open fire sensor through the respective inputs of the element "3 OR" are connected to the input of the explosion suppression unit, and the outputs from the sensor for fixing the lower explosive limit of the gas mixture, the shock wave control sensor through the corresponding inputs of the element "2 OR" are connected to the input of the regulator for the release of compressed air from the cylinder.

The invention is illustrated in the drawing, which shows a structural diagram of a device for automatic localization of explosions and fires in a mine.

The device for automatic localization of explosions and fires in a mine includes:

1. flame sensor;

2. block interface with the starter;

3. explosion suppression unit;

4. apparatus for monitoring emergency gas contamination of space;

5. a sensor for fixing the lower explosive limit of the gas mixture;

6. trunk cable connecting the sensor 5 with the device 4;

7. cylinder with compressed air;

8. The regulator of the release of compressed air from the cylinder;

9. shock wave control sensor;

10. open fire sensor;

11. the element "3 OR";

12. The element "2 OR";

AB. section of the controlled zone with: methane flame emission, open fire in the section, exposure to an air shock wave and not allowing the flame to spread beyond this section.

The operation of the circuit in the implementation of various functions is as follows.

Implementation of functions 1.3. As soon as a methane explosion occurs in the mine section adjacent to section AB, a direct shock, which is a wave and propagating from the ignition source to the periphery, acts on the input of the shock wave control sensor 9, which from its input through the "3 OR" 12 transmits a signal to the input of the explosion suppression unit and forcibly supplies a flame-extinguishing substance to section AB.

When a methane flash appears in the field of view of the sensor 1, the latter acts through the "3 OR" element on the input of block 3. Block 3 delivers a flame-extinguishing substance even in the presence of an open fire in area AB; in this case, the open fire sensor 10 responds to a fire and through the element "3 OR" 12 sends a signal to the input of block 3. In all cases, an inertial medium is created in the volume of generation for at least 15 m, which does not allow further spread of the flame along the workings.

Implementation of functions 2. When a lower explosive limit of gas appears for a given sensor 5, which controls the zone A-B of production, sensor 5 fixes this lower explosive limit [2]. The local signal from the sensor 5 is fed to the input of the regulator 8. The regulator connects its pneumatic output 8B with a cylinder of compressed air 7.

Under the action of pressure, compressed air from the cylinder is directed to the gas-polluted zone AB of production. When the concentration in the zone becomes lower than the lower explosive limit, the sensor 5 will give a signal to the monitoring apparatus 4 through the trunk cable line 6. A signal indicating that there is no explosive gas concentration in the area AB and there is no chance of an explosion. After reducing the methane concentration to 1% in accordance with & 238 [3], the operation of the combine is allowed to resume.

Implementation of functions 3. In the event of a sudden release of coal and gas from a coal seam in a short time, a large amount of gas is released, which can be directed to the controlled AB zone. To reduce the gas content in this zone, the sensor 9 detects the sudden release as a shock wave and acts on the input of the regulator 8 through the "2 OR" element (11). The regulator connects its pneumatic output 8c to a cylinder of compressed air 7. Air leaving cylinder, reduces the concentration of gas in this section AB.

When an explosion shock wave appears, it is perceived by the sensor 9, the sensor signal through the element "2 OR" is fed to the input of the controller 8. And then according to the above scheme.

Miners located on this site, not knowing about the accident that occurred at the adjacent site, may not take measures to self-rescue (will be included in self-rescuers, use the mine duct, etc.). For them, fresh air from the cylinder automatically enters the controlled area, while simultaneously reducing the gas concentration.

Implementation of functions 4. The flame of an open fire acts on the sensor of an open fire 10. The output from the sensor 10 through the corresponding inputs of the "3 OR" element is connected to the input 11 of the explosion suppression unit 3, which delivers the flame-retardant substance to the controlled area.

Thus, as a result of the implementation of functions 1, 2, 3, 4, the effectiveness of protecting the controlled area from explosion, fire, and sudden release increases.

Information sources

1. The system of localization of explosions automatic SLVA. Operation manual 1811.00.00.0004 E. Manufacturer, JSC "Red Metalist" Konotop.

2. A method for monitoring emergency gas contamination of a space and a device for its implementation. Patent for invention №2124745.

3. Safety rules in coal mines RD 05-94-95. Moscow, 1995

4. A method for automatically detecting sudden emissions in mine workings and a device for its implementation. A.S. 13502750, July 1987

Claims (1)

A device for automatic localization of explosions and fires in mine workings, including a flame sensor, an interface unit with a starter, an explosion suppression unit, characterized in that an emergency gas contamination control apparatus, a fixation sensor for the lower explosive limit of the gas mixture, a trunk cable connecting the fixation sensor the lower explosive limit of the gas mixture with the apparatus for monitoring the emergency gas contamination of the space, a cylinder with compressed air, a regulator for the release of compressed air from the cylinder, shock wave control sensor, fire sensor, "3 OR" element, "2 OR" element, the outputs of the flame sensor, shock wave control sensor, open fire sensor through the corresponding inputs of the "3 OR" connected to the input of the explosion suppression unit, and the outputs from the sensor for fixing the lower explosive limit of the gas mixture, the shock control sensor through the corresponding inputs of the element "2 OR" are connected to the input of the regulator for the release of compressed air from the cylinder.