CN220769551U - A goaf spontaneous combustion monitoring device based on through-layer drilling arrangement - Google Patents

Abstract

The utility model discloses a goaf spontaneous combustion monitoring device based on layer-penetrating drilling arrangement, which comprises a monitoring pipe, a grouting pipe, a slurry discharging pipe and a sampling pump, wherein the monitoring pipe is internally provided with the sampling pipe and a cable, the end part of the cable is provided with a temperature probe, the tail end of the monitoring pipe is provided with a flower pipe, the grouting pipe is sequentially connected with a front bag, a middle bag and a rear bag from an orifice inwards, the rear bag is close to the flower pipe, the drilling adopts a hole sealing mode of three-blocking-one-injection, grouting is carried out between the front bag and the middle bag to form an effective hole sealing section, the slurry discharging pipe penetrates through an outer bag, the orifice of the slurry discharging pipe is close to one side of the middle bag, and the sampling pump is connected with the sampling pipe. The device utilizes the through-layer drilling as a protection structure, avoids the risk of damaging the monitoring pipe by the rock caving of the coal seam roof, improves the reliability and the effectiveness of the device, and realizes the spontaneous combustion monitoring function in the goaf.

Description

A spontaneous combustion monitoring device for goaf based on through-layer drilling arrangement

Technical Field

The utility model relates to the field of coal mine spontaneous combustion monitoring, in particular to a goaf spontaneous combustion monitoring device based on layer-penetrating drilling arrangement.

Background technique

Spontaneous combustion of coal is one of the main causes of coal mine accidents. According to statistics, more than 70% of coal mines in my country are at risk of spontaneous combustion, and fires caused by spontaneous combustion of coal account for more than 90% of the total number of mine fires. With the rapid development of coal mining technology, coal mine production has become more efficient and intensive, and there are more and more large-height working faces. While production efficiency has been greatly improved, problems such as serious air leakage in the goaf and large amounts of coal residue have also arisen, providing conditions for the occurrence of spontaneous combustion of coal in the goaf. At the same time, as the mining depth continues to increase, the increase in the temperature of the original rock makes the coal more easily oxidized, further increasing the risk of spontaneous combustion of the coal residue in the goaf.

However, due to the complex conditions of the goaf itself, people cannot directly observe the interior of the goaf. In addition, the fire source in the goaf is hidden, and it has always been difficult to correctly predict and forecast the spontaneous combustion of coal. At present, coal mining enterprises generally adopt the method of burying bundle pipe monitoring systems in the tunnels at both ends of the working face, and judge the natural combustion situation of the goaf by analyzing the gas composition in the goaf, and divide the "three spontaneous combustion zones". However, the existing bundle pipe monitoring system has exposed many defects and shortcomings in actual use. For example, this method can only detect the "two channels" (machine channel and air channel) area of the goaf, but cannot monitor the spontaneous combustion situation inside the goaf, and cannot accurately and quickly determine the ignition location. Moreover, the internal environment of the goaf is complex, and the rock of the roof collapses easily causes deformation and damage of the bundle pipe, resulting in the monitoring system being unable to detect the spontaneous combustion phenomenon and carry out fire prevention and extinguishing work in the first time, and the efficiency of goaf spontaneous combustion prevention and control is low. Therefore, developing a goaf spontaneous combustion monitoring device to realize the spontaneous combustion monitoring inside the goaf has important engineering value for the prevention and control of coal mine spontaneous combustion.

Summary of the invention

In view of the defects and shortcomings of the current bundle tube monitoring system used for spontaneous combustion monitoring in coal mine goafs, the purpose of the utility model is to provide a goaf spontaneous combustion monitoring device based on a through-layer drilling arrangement.

In order to achieve the above purpose, the utility model adopts the following technical solutions:

The utility model provides a spontaneous combustion monitoring device for goaf areas based on a through-layer drilling arrangement, comprising a monitoring pipe, a grouting pipe, a slurry discharge pipe and a sampling pump, wherein a sampling pipe and a cable are arranged in the monitoring pipe, a temperature probe is provided at the end of the cable, a flower tube is provided at the end of the monitoring pipe, the grouting pipe is connected with a front bag, a middle bag and a rear bag in sequence from the orifice inward, the rear bag is close to the flower tube, the slurry discharge pipe passes through the outer bag, the orifice of the slurry discharge pipe is close to one side of the middle bag, and the sampling pump is connected to the sampling pipe.

Preferably, the grouting pipe, grouting pipe and sampling pipe are all equipped with ball valves outside the through-layer drilling hole.

Preferably, the portion of the grouting pipe connected to the front bag, the middle bag and the rear bag is provided with a one-way valve, and the portion of the grouting pipe located between the front bag and the middle bag is provided with a burst valve.

Preferably, the flower tube and the monitoring tube are connected by threads, and the flower tube and the monitoring tube are sealed by polyurethane.

Preferably, the monitoring pipe, grouting pipe and drainage pipe are fixed in the through-layer drilled hole by a "three-blocking and one-grouting" sealing method, that is, grouting is performed between the front bag and the middle bag to form an effective sealing section, and no grouting is performed between the middle bag and the rear bag.

Preferably, the temperature probe is a copper tube with one end closed and the other end open, a temperature sensor is arranged in the copper tube, the temperature sensor is connected to the cable in the monitoring tube, and the opening of the temperature probe is sealed by epoxy resin.

Preferably, the monitoring pipe, slurry discharge pipe and flower pipe are made of PVC pipe, and the grouting pipe is made of pressure-resistant hose.

The utility model has the following beneficial effects:

A. The utility model uses the through-layer drilling as a protective structure to arrange the spontaneous combustion monitoring pipe in the goaf, avoiding the risk of rock collapse on the coal seam roof damaging the monitoring pipe and improving the reliability and effectiveness of the device;

B. The "three blocking and one injection" sealing method is adopted. On the one hand, an effective sealing section is formed by grouting between the front bag and the middle bag to ensure the sealing effect of the through-layer drilling hole. On the other hand, since the space inside the through-layer drilling hole is large, in order to ensure that the gas sample collected by the sampling tube comes from the goaf, the rear bag is arranged close to the side of the flower tube to ensure the reliability of gas sample collection;

C. Comprehensively use sampling tubes to collect gas samples in the goaf and temperature probes to monitor the temperature in the goaf. Comparative analysis of the two monitoring results can more accurately determine the spontaneous combustion situation in the goaf;

D. The use of through-layer drilling holes to arrange spontaneous combustion monitoring points in the goaf provides a reliable method and technical conditions for spontaneous combustion monitoring inside the goaf.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of the device provided by the utility model;

FIG2 is a partial schematic diagram of the flower tube in FIG1 ;

FIG3 is a radial cross-sectional view of the measurement point arrangement of the utility model;

Among them, 1-through-layer drilling hole, 2-flower tube, 3-temperature probe, 4-polyurethane, 5-sampling tube, 6-rear bag, 7-middle bag, 8-front bag, 9-monitoring tube, 10-cable, 11-ball valve, 12-slurry discharge pipe, 13-grouting pipe, 14-burst valve, 15-check valve, 16-epoxy resin, 17-temperature sensor, 18-sampling pump.

Detailed ways

The specific implementation of the utility model is further described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Embodiment 1:

Referring to Fig. 1 to Fig. 3, the utility model provides a goaf spontaneous combustion monitoring device based on the arrangement of through-layer drilling, including a monitoring tube 9, a grouting tube 13, a grouting tube 12 and a sampling pump 18. The sampling tube 5, the grouting tube 13 and the grouting tube 12 are all equipped with a ball valve 11 outside the through-layer drilling 1, which is used to control the opening and closing of the sampling tube 5, the grouting tube 13 and the grouting tube 12. The sampling tube 5 and the cable 10 are arranged in the monitoring tube 9, and the end of the cable 10 is connected to the temperature probe 3. The temperature probe 3 is a copper tube with one end closed and the other end open. A temperature sensor 17 is arranged in the copper tube for monitoring the temperature data of the goaf. The temperature sensor 17 is connected to the cable 10 in the monitoring tube 9, and the opening of the temperature probe 3 is sealed by epoxy resin 16 to prevent the temperature sensor 17 from being damaged by water due to water accumulation in the through-layer drilling 1. A flower tube 2 is provided at the end of the monitoring tube 9. The flower tube 2 and the monitoring tube 9 are connected by threads. Polyurethane 4 is filled between the flower tube 2 and the monitoring tube 9. On the one hand, it is used to fix the sampling tube 5 and the cable 10. On the other hand, it prevents the monitoring tube 9 from being connected to the atmosphere, thereby ensuring that the collected gas sample originates from the goaf. The grouting pipe 13 is connected to the front bag 8, the middle bag 7 and the rear bag 6 from the orifice inward. The monitoring tube 9, the grouting pipe 13 and the slurry discharge pipe 12 are fixed in the through-layer borehole 1 by a "three-blocking and one-injection" sealing method. The part of the grouting pipe 13 connected to the front bag 8, the middle bag 7 and the rear bag 6 is provided with a one-way valve 15 for grouting into the bag to prevent the slurry from flowing back and causing poor sealing effect of the through-layer borehole 1. The part of the grouting pipe 13 located between the front bag 8 and the middle bag 7 is connected. There is a bursting valve 14. When the pressure of the grouting pipe 13 reaches the activation pressure of the bursting valve 14, the slurry is grouted by the bursting valve 14 into the drilling space between the front bag 8 and the middle bag 7 to form an effective sealing section. No grouting is performed between the middle bag 7 and the rear bag 6. Since the internal space of the through-layer borehole 1 is relatively large, in order to avoid the gas collected by the sampling pipe 5 from coming from the through-layer borehole 1 and affecting the monitoring of the actual spontaneous combustion state inside the goaf, the rear bag 6 should be arranged as close to the flower pipe 2 as possible. The slurry discharge pipe 12 passes through the outer bag, and the mouth of the slurry discharge pipe 12 is close to one side of the middle bag 7. When the slurry enters the sealing section through the bursting valve 14, the gas in the sealing section is discharged through the slurry discharge pipe 12. When the slurry gushes out of the slurry discharge pipe 12, the grouting is stopped. The sampling pump 18 is connected to the sampling pipe 5 and is used to collect gas in the goaf.

When in use, after assembling the goaf spontaneous combustion monitoring device, the goaf spontaneous combustion monitoring device is inserted deep into the through-layer borehole 1, and the flower tube is as close to the upper end of the through-layer borehole 1 as possible but cannot extend out of the through-layer borehole 1. Open the ball valve 11 on the grouting pipe 13, and inject slurry into the front bag 8, the middle bag 7 and the rear bag 6 through the one-way valve 15 on the grouting pipe 13 to make the bag expand rapidly, and fasten the outer diameters of the front bag 8, the middle bag 7 and the rear bag 6 to the hole wall, and at the same time play the role of fixing the monitoring pipe 9, the grouting pipe 13 and the slurry discharge pipe 12. Continuous injection of slurry causes the pressure of the grouting pipe 13 to gradually increase. When the pressure is greater than the starting pressure of the bursting valve 14, the bursting valve 14 opens, and the slurry is injected through the drilling space between the front bag 8 and the middle bag 7 to form an effective sealing section. During the grouting process of the sealing section, the ball valve 11 on the grouting pipe 12 is opened to discharge the air in the sealing section until the slurry gushes out of the grouting pipe 12, and the ball valves 11 on the grouting pipe 12 and the grouting pipe 13 are closed to stop grouting. When the sealing is completed, the gas inside the goaf is extracted through the sampling pump 18 connected to the sampling pipe 5 for analysis, and the natural combustion state of the goaf is judged in combination with the temperature data collected by the temperature sensor 17, so as to realize the spontaneous combustion monitoring function of the goaf.

Embodiment 2:

The main structure of this embodiment is the same as that of embodiment 1, wherein the monitoring tube 9, sampling tube 5, slurry discharge tube 12 and flower tube 2 are all made of PVC tubes, and the grouting tube 13 is made of pressure-resistant hose.

Embodiment 3:

The main structure of this embodiment is the same as that of the embodiment 1, wherein the sampling tube 5 can also be used for drainage. By opening the ball valve 11 on the sampling tube 5 , the accumulated water in the through-layer borehole 1 can be drained.

The above-described embodiments are only used to illustrate the present invention, but are not used to limit the scope of application of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. Goaf spontaneous combustion monitoring devices based on wearing layer drilling is arranged, a serial communication port, including monitor tube (9), slip casting pipe (13), row's thick liquid pipe (12) and sampling pump (18), arrange sampling pipe (5) and cable (10) in monitor tube (9), cable (10) tip is equipped with temperature probe (3), monitor tube (9) end is provided with colored pipe (2), slip casting pipe (13) have inwards connected gradually preceding bag (8), well bag (7) and back bag (6) by the drill way, and back bag (6) are close to colored pipe (2), outer bag is passed in row thick liquid pipe (12), and row thick liquid pipe (12) mouth of pipe is close to well bag (7) one side, sampling pump (18) are connected with sampling pipe (5).

2. Goaf spontaneous combustion monitoring device based on a through-layer drilling arrangement as claimed in claim 1, characterized in that the grouting pipe (13), the slurry discharging pipe (12) and the sampling pipe (5) are all provided with ball valves (11) outside the through-layer drilling (1).

3. Goaf spontaneous combustion monitoring device based on a through-layer drilling arrangement as claimed in claim 1, characterized in that the part of the grouting pipe (13) connected with the front bag (8), the middle bag (7) and the rear bag (6) is provided with a one-way valve (15), and the part of the grouting pipe (13) between the front bag (8) and the middle bag (7) is provided with a blasting valve (14).

4. Goaf spontaneous combustion monitoring device based on a through-layer drilling arrangement as claimed in claim 1, characterized in that the flowtube (2) and the monitoring tube (9) are connected through threads, and the flowtube (2) and the monitoring tube (9) are sealed through polyurethane (4).

5. Goaf spontaneous combustion monitoring device based on layer-penetrating drilling arrangement according to claim 1, characterized in that the monitoring tube (9), grouting tube (13) and slurry discharging tube (12) are fixed in the layer-penetrating drilling (1) through a hole sealing mode of three plugs and one injection, namely grouting is carried out between the front bag (8) and the middle bag (7) to form an effective hole sealing section, and grouting is not carried out between the middle bag (7) and the rear bag (6).

6. Goaf spontaneous combustion monitoring device based on layer-penetrating drilling arrangement according to claim 1, characterized in that the temperature probe (3) is a copper tube with one end closed and one end open, a temperature sensor (17) is arranged in the copper tube, the temperature sensor (17) is connected with a cable (10) in the monitoring tube (9), and the opening of the temperature probe (3) is sealed by epoxy resin (16).

7. The goaf spontaneous combustion monitoring device based on the through-layer drilling arrangement according to claim 1 is characterized in that the monitoring pipe (9), the slurry discharging pipe (12) and the flower pipe (2) are PVC pipes, and the slurry injecting pipe (13) is a pressure-resistant hose.