CN216240754U - Liquid carbon dioxide fire extinguishing device for overlying goaf - Google Patents
Liquid carbon dioxide fire extinguishing device for overlying goaf Download PDFInfo
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- CN216240754U CN216240754U CN202122970903.0U CN202122970903U CN216240754U CN 216240754 U CN216240754 U CN 216240754U CN 202122970903 U CN202122970903 U CN 202122970903U CN 216240754 U CN216240754 U CN 216240754U
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Abstract
The utility model discloses an overlying goaf liquid carbon dioxide fire extinguishing device, wherein a gas monitoring device of the overlying goaf comprises a galvanized welded pipe, the galvanized welded pipe is connected with a ball valve, and a high-pressure rubber pipe connects an outlet of the ball valve with a ball valve air inlet of an air suction pump; the air outlet of the air pump is connected with a carbon monoxide/oxygen detector by using a beam tube; the carbon monoxide/oxygen detector is communicated with the PLC controller access end through a communication cable, and the PLC controller output end is communicated with the low-temperature liquid booster pump through the communication cable; the liquid carbon dioxide pressure injection device for the overlying goaf comprises a galvanized welded pipe, the galvanized welded pipe is connected with a ball valve, and a high-pressure rubber pipe connects the outlet of the ball valve with the opening of the liquid flow divider; the liquid splitter is connected with the low-temperature liquid booster pump through a high-pressure rubber pipe; the low-temperature liquid booster pump is connected with the liquid carbon dioxide storage tank through a high-pressure rubber pipe. The utility model has the characteristics of accurate monitoring, good effect, good safety and advanced prevention.
Description
Technical Field
The utility model belongs to the technical field of coal mine fire prevention and extinguishing, and particularly relates to a liquid carbon dioxide fire extinguishing device for an overlying goaf.
Background
The coal seams at close distances, namely, the coal seams with larger mutual influence between the mining of the upper coal layer and the mining of the lower coal layer are relatively close because the occurrence conditions of the coal seams are different. The following problems mainly exist in daily mining:
(1) after the mining work of the upper coal seam is finished and a goaf is formed, the residual coal in the goaf is easily oxidized and coal spontaneous combustion accidents are caused under the condition of proper air leakage and the addition of good heat storage conditions. When mining work is carried out, mining influence causes fracture development and communication to be close to a goaf, multi-zone continuous air leakage can be generated under the influence of air pressure, and when accumulated float coal in an overlying goaf is in an air leakage and oxygen supply zone, coal spontaneous combustion accidents can be caused;
(2) in a high gas mine, a large amount of gas is accumulated in a goaf, an overlying rock layer collapses after coal on a working face is mined out to form a porous medium, the existing goaf is communicated with the overlying goaf and nearby roadways in a crack manner, and the gas accumulated in the overlying goaf has the possibility of flowing into an upper corner of a lower working face, so that the local gas at the upper corner is over-limited, and the normal production of the working face is influenced;
(3) the spontaneous combustion coal body is easy to cause explosion accidents after contacting with the accumulated gas, and casualties are caused.
Aiming at the problems, the current main solutions at home and abroad still stay at the technical aspect of fire extinguishing in overlying goafs, abnormal timely treatment is found, prevention and control means such as ground drilling water injection, grouting and glue injection are mainly adopted, the defects are obvious, and the following points are as follows:
the position of an observation hole of the overlying gob sealing wall is far away from the mining-induced fracture affected area of the lower working face, so that the abnormal condition cannot be accurately monitored;
the construction period of drilling on the ground is long, the interval time between problem discovery and treatment is too long, and the disaster is easily expanded;
the method is greatly limited by the specific conditions of the earth surface, and sometimes, the drilling is difficult to accurately drill to a dangerous area, even the drilling cannot be performed;
in a high gas mine, an overlying goaf often has a gas accumulation phenomenon, the accumulated gas is difficult to process by normal means, and the accumulated gas reaches a certain concentration and can cause explosion accidents when encountering open fire;
water injection, grouting and glue injection are carried out on the ground along with a large amount of water which gushes into the overlying goaf, so that water gushing and slurry burst of a lower working face are easily caused.
SUMMERY OF THE UTILITY MODEL
In order to overcome the technical problems, the utility model aims to provide the liquid carbon dioxide fire extinguishing device for the overlying goaf, which has the characteristics of accurate monitoring, good effect, good safety and advanced prevention.
In order to achieve the purpose, the utility model adopts the technical scheme that:
the liquid carbon dioxide fire extinguishing device for the overlying goaf comprises an overlying goaf gas monitoring device and an overlying goaf liquid carbon dioxide pressure injection device;
the gas monitoring device for the overlying goaf comprises a galvanized welded pipe 3, wherein the galvanized welded pipe 3 sealed in a hole is connected out through a tail ball valve 4, and the outlet of the ball valve 4 is connected with a ball valve gas inlet of an air pump 6 by using a high-pressure rubber pipe 5; an air nozzle 7 is arranged at the air outlet of the air pump 6, and the air nozzle 7 is connected with a carbon monoxide/oxygen detector 9 by using a bundle pipe; the carbon monoxide/oxygen detector 9 is communicated with the PLC 10 at the inlet end by a communication cable 11, and the PLC 10 at the outlet end is communicated with a low-temperature liquid booster pump 12 by the communication cable 11;
the liquid carbon dioxide pressure injection device for the overlying goaf comprises a galvanized welded pipe 3, wherein the galvanized welded pipe 3 sealed in a hole is connected out through a tail ball valve 4, and the outlet of the ball valve 4 is connected with a liquid flow divider 13 in a split mode through a high-pressure rubber pipe 5; an inlet of the liquid splitter 13 is connected with an outlet of the low-temperature liquid booster pump 12 through a ball valve by using a high-pressure rubber pipe; the inlet of the low-temperature liquid booster pump 12 is connected with the liquid outlet of the liquid carbon dioxide storage tank 14 through a ball valve by using a high-pressure rubber pipe.
And a protective sleeve 1 is arranged on the outer side of the galvanized welded pipe 3.
And an air hole cover 2 is arranged on the inner side of the protective sleeve 1 at the end part of the galvanized welded pipe 3.
The use method of the liquid carbon dioxide fire extinguishing device for the overlying goaf comprises the following steps;
(1) upward construction positioning drill holes of a non-production side top plate are communicated with the overlying goaf every 400m along the working face air inlet and return roadway, protective sleeves 1 are put in, and the mounting of the overlying goaf gas monitoring device is completed in sequence, and the device enters a real-time gas monitoring state;
(2) constructing a parallel injection hole to a production side (according to a horizontal angle of 45 degrees) top plate at intervals of 100m by taking a monitoring hole with a service radius of 200m as a center, installing a galvanized welded pipe 3 welded with an air hole cover 2 and a ball valve after a protective sleeve 1 is put down, sealing the galvanized welded pipe for later use, sequentially connecting an exposed end of the galvanized welded pipe 3, a liquid flow divider 13, a low-temperature liquid booster pump 12 and a liquid carbon dioxide storage tank 14 by using a high-pressure rubber pipe, and closing the liquid carbon dioxide storage tank 14 for later use (taking 4 measure holes within the range of 200m of 1 monitoring hole as a group, and taking the following steps as a group as a unit);
(3) in the normal production process, monitoring the drilling holes in real time, and closing the injection drilling holes for later use; when monitoring the borehole and monitoring carbon monoxide to be abnormal, the system can rapidly give an alarm, at the moment, a person opens a valve of a liquid carbon dioxide storage tank 14, a linkage system opens a power switch of a low-temperature liquid booster pump 12 to carry out liquid carbon dioxide pressure injection work, when the oxygen concentration is lower than 8%, the power switch of the low-temperature liquid booster pump 12 is closed to stop working, and when the carbon monoxide gas is abnormal again, the power switch of the booster pump is opened again;
(4) the above description is a working cycle, after completing a plurality of cycles, the liquid carbon dioxide in the liquid carbon dioxide storage tank 14 is used up, the worker turns off the power supply to replace the liquid carbon dioxide storage tank 14, and then turns on the power supply to restart the fire protection work.
In the normal production process, gas in the overlying goaf is pumped out by an air pump through a monitoring drill hole, the gas sequentially passes through a gas hole cover, a galvanized welded pipe, a ball valve, a high-pressure rubber pipe, an air pump and an air nozzle and enters a carbon monoxide/oxygen detector, the detector inputs the detection result into a PLC (programmable logic controller), output signals of different concentrations of CO (determined according to the experimental result of the programmed temperature rise of the coal bed) are arranged in the controller to determine the starting of a booster pump, when the monitored carbon monoxide is abnormal, a rapid alarm is given, at the moment, a person opens a valve of the liquid carbon dioxide storage tank, the PLC outputs a signal for opening the low-temperature liquid booster pump, a power switch of the low-temperature liquid booster pump is opened, and the liquid carbon dioxide stored in the liquid carbon dioxide storage tank is pressed into the overlying goaf through the low-temperature liquid booster pump, the high-pressure rubber pipe, the liquid flow divider, the ball valve, the galvanized welded pipe and the air hole cover in sequence;
meanwhile, gas in the overlying goaf is continuously pumped out by the air pump through the monitoring drill hole, the gas sequentially passes through the gas hole cover galvanized welded pipe, the ball valve, the high-pressure rubber pipe, the air pump and the gas nozzle and enters the carbon monoxide/oxygen detector, the detector inputs the detection result into the PLC, an output signal with the oxygen concentration lower than 8% is set in the controller to determine the closing of the booster pump, and when the monitored oxygen is lower than 8%, a power switch of the low-temperature liquid booster pump is closed, and the pressure injection work is stopped;
when the carbon monoxide gas is abnormal again, the power switch of the booster pump is turned on again, and the end of the pressure injection work is determined by an output signal of the oxygen concentration (the oxygen concentration is lower than 8%) according to the gas concentration feedback;
the above description is a work cycle, and after a plurality of cycles of work are completed, the liquid carbon dioxide in the liquid carbon dioxide storage tank is used up, and the staff closes the power supply to replace the liquid carbon dioxide storage tank, and then opens the power supply to restart the fire-proof work.
The utility model has the beneficial effects.
(1) The method solves the problems that the gas sample detection of the overlying goaf is inaccurate, and the oxidation degree of the residual coal in the goaf is difficult to clearly judge. Fixed-point real-time monitoring is adopted, air is directly extracted from a hidden danger area for sampling, and distortion generated in the gas migration process is eliminated.
(2) The problems of small original drilling radiation range and dense drilling construction of the traditional fire extinguishing technologies such as water injection, grouting and glue injection for fire prevention and extinguishment in the overlying goaf are solved. After the liquid carbon dioxide is vaporized, the expansion is about 640 times of the original volume, the migration range is large, and the radiation range is wide.
(3) The method avoids introducing a large amount of water sources into the overlying goaf, and solves the problems of water burst and slurry burst on the lower stope surface by the traditional fire extinguishing technologies such as fire-extinguishing water injection, grouting, glue injection and the like of the overlying goaf.
(4) On the basis of fire prevention and extinguishing, the gas accumulated in the overlying goaf is inerted. The carbon dioxide after vaporization and expansion can quickly dilute and inert the accumulated methane gas, so that the danger of gas explosion is reduced;
(5) the passive mode that the original grouting, glue injection and the like are processed only when problems occur is converted into the pre-processing mode, and active prevention and control are realized. By adopting a pre-construction mode, in normal stoping of a working face, spontaneous combustion of residual coal in an overlying goaf can be prevented in a normalized mode, effective measures can be taken quickly at the first time of abnormity, the treatment time is shortened, the damage time of accidents is reduced, and the accidents are prevented from further expanding.
Description of the drawings:
FIG. 1 is a schematic view of an overlying goaf gas monitoring and carbon dioxide injection control device.
FIG. 2 is a flow chart of an overlying goaf gas monitoring and carbon dioxide injection control device.
FIG. 3 is a schematic view of a liquid carbon dioxide injection device for an overlying goaf.
FIG. 4 is a left side view of hole site placement.
FIG. 5 is a front view of hole site placement.
Fig. 6 is a schematic flow chart.
FIG. 7 is a schematic view of the structure of the present invention.
The device is marked with 1 protective sleeve; 2, an air hole cover; 3, galvanizing the welded pipe; 4, a ball valve; 5, a high-pressure rubber pipe; 6, an air pump; 7, air tap; 8 bundles of tubes; 9 carbon monoxide/oxygen detector; 10PLC controllers; 11 a communication cable; 12 a low-temperature liquid booster pump; 13 a liquid splitter; 14 a liquid carbon dioxide storage tank; 15 monitoring the borehole; 16, injection drilling;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-7: overlying goaf gas monitoring and carbon dioxide pressure injection control device:
the overlying goaf gas monitoring and carbon dioxide pressure injection control device comprises: 1, protecting a sleeve; 2, an air hole cover; 3, galvanizing the welded pipe; 4, a ball valve; 5, a high-pressure rubber pipe; 6, an air pump; 7, air tap; 8 bundles of tubes; 9 carbon monoxide/oxygen detector; 10 a communication cable; 11 a PLC controller; 12 cryogenic liquid booster pump.
The working principle is as follows: and drilling positioning drill holes upwards along the top plate of the air inlet and return roadway of the working face to communicate with the overlying goaf and then placing a protective sleeve. And inserting one end of the galvanized welded pipe welded with the air hole cover into the sleeve, determining that the air hole reaches the overlying goaf, and carrying out hole sealing treatment. The exposed end of the galvanized welded pipe is connected with an air extracting pump through a ball valve and a high-pressure rubber pipe in sequence, and the air nozzle of the air extracting pump is connected into a beam pipe and is directly connected into a carbon monoxide detector.
The gas in the overlying goaf is pumped by a suction pump under negative pressure and then is sent into a carbon monoxide/oxygen gas detector for detection and analysis, the detector inputs the detection result into a PLC (programmable logic controller), output signals of different concentrations (determined according to the experimental result of coal bed temperature program heating) of CO are set in the controller to determine the opening and closing of a booster pump, then the opening of the liquid carbon dioxide pressure injection work is executed, and meanwhile, according to the feedback of the gas concentration, the output signal of the oxygen concentration (the oxygen concentration is lower than 8%) determines the ending of the pressure injection work.
As shown in fig. 3: and (3) overlaying a goaf liquid carbon dioxide pressure injection device:
the liquid carbon dioxide pressure injection device of overlying goaf includes: 1, protecting a sleeve; 2, an air hole cover; 3, galvanizing the welded pipe; 4, a ball valve; 5, a high-pressure rubber pipe; 6 a liquid splitter; 7 a low-temperature liquid booster pump; 8 liquid carbon dioxide storage tank.
The working principle is as follows: and drilling positioning drill holes upwards along the top plate of the air inlet and return roadway of the working face to communicate with the overlying goaf and then placing a protective sleeve. And inserting one end of the galvanized welded pipe welded with the air hole cover into the sleeve, determining that the air hole reaches the overlying goaf, and carrying out hole sealing treatment. The exposed end of the galvanized welded pipe, the liquid flow divider, the low-temperature liquid booster pump and the liquid carbon dioxide storage tank are connected in sequence by a high-pressure rubber pipe. When the coal spontaneous combustion device works, liquid carbon dioxide in the storage tank is pressed into the overlying goaf through the low-temperature liquid booster pump, and the liquid carbon dioxide can quickly absorb heat and vaporize after entering the overlying goaf, so that heat required by coal spontaneous combustion is taken away; because the density of the carbon dioxide is greater than that of the air, the vaporized carbon dioxide can be settled on the surface of the coal body, a layer of carbon dioxide zone is formed in the residual coal in the overlying goaf, and the carbon dioxide zone is covered on the coal body to prevent the carbon dioxide from continuously contacting with oxygen; meanwhile, a large amount of carbon dioxide enters the goaf to inertize the original gas in the goaf and dilute the gas in the goaf, so that the explosion suppression effect is achieved.
As shown in fig. 4 and 5:
the fire prevention and extinguishing method for the overlying goaf of the close-distance coal seam comprises the following steps:
the required device consists of an overlying goaf gas monitoring device, an overlying goaf liquid carbon dioxide pressure injection device and a linkage system.
The use method comprises the following steps:
(1) upward construction positioning drill holes of a non-production side top plate are communicated with the overlying goaf every 400m along the working face air inlet and return roadway, protective sleeves 1 are put in, and the mounting of the overlying goaf gas monitoring device is completed in sequence, and the device enters a real-time gas monitoring state;
(2) constructing a parallel injection hole to a production side (according to a horizontal angle of 45 degrees) top plate at intervals of 100m by taking a monitoring hole with a service radius of 200m as a center, installing a galvanized welded pipe 3 welded with an air hole cover 2 and a ball valve after a protective sleeve 1 is put down, sealing the galvanized welded pipe for later use, sequentially connecting an exposed end of the galvanized welded pipe 3, a liquid flow divider 13, a low-temperature liquid booster pump 12 and a liquid carbon dioxide storage tank 14 by using a high-pressure rubber pipe, and closing the liquid carbon dioxide storage tank 14 for later use (taking 4 measure holes within the range of 200m of 1 monitoring hole as a group, and taking the following steps as a group as a unit);
(3) in the normal production process, monitoring the drilling holes in real time, and closing the injection drilling holes for later use; when monitoring the borehole and monitoring carbon monoxide to be abnormal, the system can rapidly give an alarm, at the moment, a person opens a valve of a liquid carbon dioxide storage tank 14, a linkage system opens a power switch of a low-temperature liquid booster pump 12 to carry out liquid carbon dioxide pressure injection work, when the oxygen concentration is lower than 8%, the power switch of the low-temperature liquid booster pump 12 is closed to stop working, and when the carbon monoxide gas is abnormal again, the power switch of the booster pump is opened again;
(4) the above description is a working cycle, after completing a plurality of cycles, the liquid carbon dioxide in the liquid carbon dioxide storage tank 14 is used up, the worker turns off the power supply to replace the liquid carbon dioxide storage tank 14, and then turns on the power supply to restart the fire protection work.
Claims (3)
1. The liquid carbon dioxide fire extinguishing device for the overlying goaf is characterized by comprising an overlying goaf gas monitoring device and an overlying goaf liquid carbon dioxide pressure injection device;
the gas monitoring device for the overlying goaf comprises a galvanized welded pipe (3), wherein the galvanized welded pipe (3) sealed in a hole is connected out through a tail ball valve (4), and the outlet of the ball valve (4) is connected with a ball valve gas inlet of an air suction pump (6) by using a high-pressure rubber pipe (5); an air nozzle (7) is arranged at an air outlet of the air pump (6), and the air nozzle (7) is connected with a carbon monoxide/oxygen detector (9) by using a bundle pipe; the carbon monoxide/oxygen detector (9) is communicated with the access end of a PLC (programmable logic controller) (10) through a communication cable (11), and the output end of the PLC (10) is communicated with a low-temperature liquid booster pump (12) through the communication cable (11);
the liquid carbon dioxide pressure injection device for the overlying goaf comprises a galvanized welded pipe (3), the galvanized welded pipe (3) sealed in the hole is connected out through a tail ball valve (4), and the outlet of the ball valve (4) is connected with a liquid flow divider (13) in a split mode through a high-pressure rubber pipe (5); an inlet of the liquid splitter (13) is connected with an outlet of the low-temperature liquid booster pump (12) through a ball valve by using a high-pressure rubber pipe; the inlet of the low-temperature liquid booster pump (12) is connected with the liquid outlet of the liquid carbon dioxide storage tank (14) through a ball valve by using a high-pressure rubber pipe.
2. The overlying goaf liquid carbon dioxide extinguishing device according to claim 1, wherein a protective sleeve (1) is arranged outside the galvanized welded pipe (3).
3. The overlying goaf liquid carbon dioxide extinguishing device according to claim 1, wherein a gas hole cover (2) is arranged inside the protective sleeve (1) at the end of the galvanized welded pipe (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122970903.0U CN216240754U (en) | 2021-11-27 | 2021-11-27 | Liquid carbon dioxide fire extinguishing device for overlying goaf |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122970903.0U CN216240754U (en) | 2021-11-27 | 2021-11-27 | Liquid carbon dioxide fire extinguishing device for overlying goaf |
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| CN216240754U true CN216240754U (en) | 2022-04-08 |
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| CN202122970903.0U Active CN216240754U (en) | 2021-11-27 | 2021-11-27 | Liquid carbon dioxide fire extinguishing device for overlying goaf |
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