Device and method for detecting fire source in goaf area by arranging temperature measuring optical fiber in directional long drilling

Abstract

The invention discloses a device for detecting fire sources in goafs by arranging temperature measuring optical fibers in directional long boreholes, belonging to the technical field of coal mine safety, comprising a temperature measuring optical fiber, an optical fiber fixture, a continuous protective tube, a roller and an optical fiber temperature measuring analyzer, wherein the temperature measuring optical fiber is arranged in the continuous protective tube, the roller and the optical fiber temperature measuring analyzer are arranged outside the directional borehole, and one end of the continuous protective tube is wound around the roller, and the other end of the temperature measuring optical fiber is connected to the optical fiber temperature measuring analyzer. A method for detecting fire sources in goafs by arranging temperature measuring optical fibers in directional long boreholes is disclosed. The invention utilizes a combined technical means of directional drilling hole formation, continuous protective tube protection, and optical fiber distributed temperature measurement, and can effectively complete directional drilling, optical fiber arrangement and temperature measurement work in advance or after discovering signs of fire in the goaf, thereby improving the accurate determination of the fire position in the goaf, and providing effective, rapid and accurate technical means for monitoring the spontaneous combustion of coal seams in goafs of coal mines.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine safety, and in particular provides a device and a method for detecting a fire source in a goaf area by arranging temperature measuring optical fibers through directional long drilling holes. Background Art

[0002] Spontaneous combustion of coal seams in goaf areas of coal mines is one of the major hidden dangers of coal mine safety production, and its degree of harm cannot be ignored. Accurate monitoring of the location of fire sources is of vital importance for timely warning, effective prevention and control of fire accidents, and ensuring the safety of coal mine production. However, we are still facing many challenges in the field of monitoring the location of fire sources in goaf areas.

[0003] At present, the detection of fire source locations in goaf mainly adopts the pre-buried bundle pipe method, ground drilling method and closed monitoring method. However, these methods have obvious limitations in practical applications.

[0004] The pre-buried bundle pipe method is limited by the tunnel space, and the bundle pipes can only be arranged along the coal wall, which is difficult to reach the middle area of ​​the goaf, resulting in a limited monitoring range. In addition, rockfalls frequently occur in the goaf, and the bundle pipes are easily damaged, which not only increases maintenance costs, but also seriously affects the continuity and reliability of monitoring.

[0005] Although the ground drilling method can directly detect the interior of the goaf, it is time-consuming, costly, and has relatively low detection accuracy. In actual operation, it is often difficult to accurately determine the specific location of the fire source, which brings considerable difficulties to fire prevention and control work.

[0006] Although the closed monitoring method can reflect the changes in gas concentration in the goaf to a certain extent, its monitoring accuracy and range are limited. For fire sources with strong concealment, this method is often difficult to effectively detect, thus missing the best prevention and control opportunities.

[0007] In summary, we currently lack an accurate, effective and reliable technical means to monitor the location of fire sources in goaf areas. Summary of the invention

[0008] To solve the above problems, the present invention provides a device and method for arranging temperature measuring optical fibers in directional long boreholes to detect fire sources in goafs, forming a precise temperature measurement solution for goafs that combines directional drilling, continuous pipe protection, and optical fiber distributed temperature measurement.

[0009] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a device for arranging a temperature measuring optical fiber to detect the fire source in the goaf in a directional long borehole is arranged in the directional borehole, and includes a temperature measuring optical fiber, an optical fiber fixture, a continuous protective tube, a roller and an optical fiber temperature measuring analyzer. The temperature measuring optical fiber is arranged in the continuous protective tube, and one end of the temperature measuring optical fiber is fixedly installed on the rear end of the optical fiber fixture. The roller and the optical fiber temperature measuring analyzer are arranged outside the directional borehole, and one end of the continuous protective tube is wound on the roller, and the other end of the temperature measuring optical fiber is connected to the optical fiber temperature measuring analyzer.

[0010] The optical fiber holder includes a pointed head, a wing plate shaft, a wing plate, a wing plate spring, a central column and a docking groove, wherein the pointed head and the docking groove are respectively integrally formed at the front and rear ends of the central column, and the temperature measuring optical fiber is fixedly installed in the docking groove, the inner diameter of the docking groove is the same as the outer diameter of the continuous protective tube, and the other end of the continuous protective tube is inserted into the docking groove, the outer circumference of the central column is symmetrically fixedly installed with the wing plate shaft, and the wing plate is rotatably assembled on the wing plate shaft, the outer circumference of the central column is equipped with one end of the wing plate spring, and the other end of the wing plate spring is fixedly installed on the wing plate, and the outer end of the wing plate is integrally formed with a protrusion.

[0011] Furthermore, the temperature measuring optical fiber includes an optical fiber bundle, an armored steel belt, a high-strength steel wire and a PE outer sheath. The armored steel belt is a tubular structure. The optical fiber bundle is arranged inside the armored steel belt. The armored steel belt is filled with a PE filling layer. The PE outer sheath is wrapped around the outer surface of the armored steel belt. High-strength steel wires are evenly installed between the armored steel belt and the PE outer sheath, and one end of the high-strength steel wire close to the optical fiber holder is locked in the docking groove.

[0012] Furthermore, the inner wall of the continuous protective tube is smoothed and coated with lubricating oil.

[0013] Furthermore, an explosion-proof housing is provided on the outside of the optical fiber temperature measuring and analyzing instrument.

[0014] The method for arranging temperature measuring optical fibers in directional long boreholes to detect fire sources in goaf areas, using the device for arranging temperature measuring optical fibers in directional long boreholes to detect fire sources in goaf areas, specifically comprises the following steps:

[0015] S1, when there are signs of spontaneous combustion in the goaf of the coal mine, the predetermined drilling trajectory is designed according to the spatial distribution of the tunnel and the goaf;

[0016] S2, using a directional drilling machine to perform directional drilling according to a predetermined drilling trajectory;

[0017] S3, after the directional drilling construction is completed, the roller with the continuous protective tube is transported to the hole mouth, the temperature measuring optical fiber is pre-placed inside the continuous protective tube, the front end of the temperature measuring optical fiber is connected to the rear end of the optical fiber holder, and the front end of the continuous protective tube is inserted into the docking groove of the optical fiber holder;

[0018] S4, the driving roller rotates forward, one end of the continuous protective tube is unfolded from the roller, and the optical fiber holder is pushed into the directional drilling hole. During the advancement of the optical fiber holder in the directional drilling hole, the wing plate compresses the wing plate spring under the restriction of the borehole wall, and the wing plate is in a contracted state, which does not affect the advancement of the optical fiber holder. As the roller rotates, the continuous protective tube pushes the optical fiber holder to the set position at the bottom of the directional drilling hole;

[0019] S5, the driving roller is reversed, and the continuous protective tube is rewound onto the roller under the drive of the roller, and the continuous protective tube is separated from the docking groove on the optical fiber holder and gradually moves out of the directional drilling hole. At the same time, when the optical fiber holder retreats to the outside of the directional drilling hole, the wing plate is expanded outward under the action of the wing plate spring, and the protrusion at the tail of the wing plate pierces the coal wall to prevent the optical fiber holder from moving further to the outside of the drilling hole. One end of the temperature measuring optical fiber is fixed to the rear of the optical fiber holder. Therefore, when the continuous protective tube is moved out of the drilling hole, the temperature measuring optical fiber is separated from the continuous protective tube. After the continuous protective tube is completely moved out of the drilling hole, the temperature measuring optical fiber remains in the directional drilling hole, and the arrangement of the temperature measuring optical fiber is completed.

[0020] S6, connecting the orifice end of the temperature measuring optical fiber to the optical fiber temperature measuring analyzer, displaying the temperature of the temperature measuring optical fiber through the optical fiber temperature measuring analyzer, measuring the average temperature of the temperature measuring optical fiber every 1m to 2m, and recording it as a data node;

[0021] S7, repeat steps S2 to S6, arrange several temperature measuring optical fibers at the bottom of the goaf to form a temperature measuring network, monitor the temperature data of the data nodes in real time, draw isotherms of the temperature distribution in the goaf, mark the obvious high-temperature center inside the goaf, and thus determine the location of spontaneous combustion of the coal seam.

[0022] Furthermore, in step S1, the design of the predetermined drilling trajectory is divided into the following three schemes:

[0023] a. When the air inlet and return air lanes in the goaf of the mining face are closed, a directional drilling rig is designed to be set up in front of the closed goaf of the two lanes. Each directional drilling rig constructs several directional boreholes, and the trajectory of each directional borehole is an arc. The directional boreholes constructed by the two directional drilling rigs are located in the upper and lower layers respectively, and are staggered to form a temperature measurement network;

[0024] b. When the work in the goaf has been completed and there is no adjacent drift in the goaf, it is designed to construct several directional drill holes in the main lane of the mining area adjacent to the goaf towards the goaf, and each directional drill hole is arranged in parallel on the plane;

[0025] c. When there are adjacent drift tunnels in the goaf, it is designed to construct several directional drill holes from the adjacent drift tunnels toward the goaf, and each directional drill hole is arranged in parallel on the plane.

[0026] Furthermore, in scheme a, the distance between the upper directional drill hole and the bottom of the goaf is 0.5 m, and the distance between the lower directional drill hole and the bottom of the goaf is 1 m.

[0027] Furthermore, in step S2, the output end of the directional drilling rig is equipped with a drill rod, and the front end of the drill rod is equipped with an inclinometer unit and a directional drill bit, and the inclinometer unit is used to monitor the actual drilling trajectory in real time.

[0028] Furthermore, in step S2, the distance between the directional drilling hole and the bottom of the goaf is 0.5m to 1m.

[0029] The beneficial effects of using the present invention are:

[0030] The present invention provides a continuous protective tube to support and protect the temperature measuring optical fiber being arranged, so as to realize the lowering of the optical fiber in the nearly horizontal directional drilling hole without causing physical damage to the temperature measuring optical fiber. At the same time, an optical fiber fixer is provided on the temperature measuring optical fiber to realize the fixation of the temperature measuring optical fiber in the directional drilling hole, so that the temperature measuring optical fiber can be accurately arranged in the directional drilling hole below the goaf, thereby realizing accurate temperature measurement.

[0031] The present invention designs different predetermined drilling trajectories according to the working conditions of the goaf of the mining face, and constructs directional drilling and arranges temperature measuring optical fibers accordingly, forming a temperature measurement network below the goaf. At the same time, optical fiber distributed temperature measurement is adopted to effectively measure the temperature of each position in the goaf, and the isotherms of the temperature distribution in the goaf are drawn through an external computer, and the obvious high-temperature center is marked to determine the spontaneous combustion position of the coal seam.

[0032] The present invention utilizes a combination of technical means including directional drilling, continuous pipe protection, and optical fiber distributed temperature measurement. It can effectively complete directional drilling, optical fiber layout, and temperature measurement in advance or after discovering signs of fire in the goaf, thereby improving the accurate determination of the fire location in the goaf and providing an effective, fast, and accurate technical means for monitoring the spontaneous combustion of coal seams in coal mine goafs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the cross-sectional structure of the temperature measuring optical fiber of the present invention.

[0034] Figure 2 It is a partial cross-sectional structural schematic diagram of the temperature measuring optical fiber of the present invention.

[0035] Figure 3 It is a schematic diagram of the connection structure of the temperature measuring optical fiber, the optical fiber holder and the continuous protective tube of the present invention.

[0036] Figure 4 It is a connection diagram of the optical fiber temperature measuring analyzer of the present invention.

[0037] Figure 5 It is a schematic diagram of directional drilling construction in goaf area of ​​the present invention.

[0038] Figure 6 This is a schematic diagram of the lower side of the temperature measuring optical fiber in the directional drilling of the present invention.

[0039] Figure 7 The figure is a schematic diagram of the implementation process of retrieving the continuous protective tube according to the present invention.

[0040] Figure 8 This is a schematic diagram of the temperature measurement optical fiber arrangement of solution a of the present invention.

[0041] Fig. 9 This is a schematic diagram of the temperature measurement optical fiber arrangement of solution b of the present invention.

[0042] Fig.10 This is a schematic diagram of the temperature measurement optical fiber arrangement of solution c of the present invention.

[0043] Fig.11 It is a schematic diagram of the temperature measurement curve results of the present invention.

[0044] The reference numerals include: 1. temperature measuring optical fiber, 101. optical fiber bundle, 102. PE filling layer, 103. armored steel belt, 104. high-strength steel wire, 105. PE outer sheath, 2. optical fiber holder, 201. tip, 202. wing plate shaft, 203. wing plate, 2031. protrusion, 204. wing plate spring, 205. center column, 206. docking groove, 3. continuous protective tube, 4. roller, 5. optical fiber temperature measuring analyzer, 6. directional drilling rig, 7. drill pipe, 8. directional drill bit, 9. inclinometer unit, 10. directional drilling, 11. data node, 12. isotherm, 13. high temperature center, 14. goaf, 15. goaf sealing. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Embodiment 1

[0047] Reference Figures 1 to 4A device for detecting fire sources in goaf areas by arranging temperature measuring optical fibers in directional long boreholes is arranged in a directional borehole 10, and includes a temperature measuring optical fiber 1, an optical fiber fixture 2, a continuous protective tube 3, a roller 4 and an optical fiber temperature measuring analyzer 5. The temperature measuring optical fiber 1 is arranged in the continuous protective tube 3, and one end of the temperature measuring optical fiber 1 is fixedly installed on the rear end of the optical fiber fixture 2. The roller 4 and the optical fiber temperature measuring analyzer 5 are arranged on the outside of the directional borehole 10, and one end of the continuous protective tube 3 is wound on the roller 4, and the other end of the temperature measuring optical fiber 1 is connected to the optical fiber temperature measuring analyzer 5.

[0048] The temperature measuring optical fiber 1 is used to measure the temperature from below the goaf 14 , and then determine the location of the fire source in the goaf 14 .

[0049] The optical fiber holder 2 is used to drive the temperature measuring optical fiber 1 to smoothly advance in the directional drill hole 10 and to fix the temperature measuring optical fiber 1 after the arrangement is completed.

[0050] The continuous protective tube 3 is an integrated continuous tube with a turning radius of less than 2m. The continuous protective tube 3 is sleeved on the outside of the temperature measuring optical fiber 1 to play a supporting and protective role during the lowering and arrangement of the temperature measuring optical fiber 1, thereby preventing the temperature measuring optical fiber 1 from being damaged during movement.

[0051] The roller 4 is used to retract and release the continuous protective tube 3, complete the lowering of the temperature measuring optical fiber 1 and the recovery of the continuous protective tube 3. At the same time, the roller 4 has a distance measuring function, which can determine the lowering distance of the continuous protective tube 3 according to the number of rolling circles, thereby accurately positioning the release of the continuous protective tube 3.

[0052] The optical fiber temperature measuring analyzer 5 is connected to the temperature measuring optical fiber 1 and measures the temperature values ​​at different positions on the temperature measuring optical fiber 1 by a distributed temperature measuring method.

[0053] The optical fiber temperature analyzer 5 is connected to an external computer to draw the isotherms 12 of the temperature distribution in the goaf, mark the obvious high temperature center 13, and then determine the spontaneous combustion position of the coal seam.

[0054] like Figure 3 As shown, the optical fiber holder 2 includes a pointed head 201, a wing plate shaft 202, a wing plate 203, a wing plate spring 204, a central column 205 and a docking groove 206. The pointed head 201 and the docking groove 206 are respectively integrally formed at the front and rear ends of the central column 205, and the temperature measuring optical fiber 1 is fixedly installed in the docking groove 206. The inner diameter of the docking groove 206 is the same as the outer diameter of the continuous protective tube 3, and the other end of the continuous protective tube 3 is inserted into the docking groove 206. The wing plate shaft 202 is symmetrically fixedly installed on the outer circumference of the central column 205, and the wing plate 203 is rotatably assembled on the wing plate shaft 202. One end of the wing plate spring 204 is assembled on the outer circumference of the central column 205, and the other end of the wing plate spring 204 is fixedly installed on the wing plate 203. The outer end of the wing plate 203 is integrally formed with a protrusion 2031.

[0055] The design of the pointed head 201 enables the optical fiber holder 2 to push away the cinders when advancing in the directional borehole 10, thereby improving the passability of the optical fiber holder 2 in the borehole.

[0056] The wing plate 203 can rotate around the wing plate shaft 202 , and the position of the wing plate 203 is limited by the elastic force of the wing plate spring 204 .

[0057] A protrusion 2031 is provided on the wing plate 203, so that the outer end of the wing plate 203 can penetrate into the hole wall more easily.

[0058] The central column 205 and the wing plate 203 are both equipped with mounting shafts, which can rotate along the axis. A telescopic rod is installed between the two mounting shafts, and the wing plate spring 204 is sleeved on the telescopic rod to ensure that the wing plate spring 204 is set in a straight line and can be telescoped and rotated with the deflection of the wing plate 203.

[0059] The wing plate spring 204 is in an extended state when not subject to external force, and the wing plate 203 is in an expanded state. When the optical fiber holder 2 enters the directional drilled hole 10, the wing plate 203 deflects inwardly under the restriction of the hole wall and compresses the wing plate spring 204. When moving forward, the wing plate 203 is always in a retracted state and will not affect the forward movement of the optical fiber holder 2. When moving backward, under the action of the wing plate spring 204 and the protrusion 2031, the outer end of the wing plate 203 will penetrate into the hole wall to prevent the optical fiber holder 2 from continuing to move backward, thereby achieving the fixation of the position of the optical fiber holder 2.

[0060] The optical fiber holder 2 contacts the continuous protective tube 3 through the docking groove 206. When the optical fiber holder 2 moves forward in the directional drilling hole 10, the thrust of the continuous protective tube 3 realizes the movement of the optical fiber holder 2. When the optical fiber holder 2 moves backward, the wing plate 203 penetrates into the hole wall, thereby preventing the movement of the optical fiber holder 2, causing the continuous protective tube 3 to detach from the docking groove 206, thereby realizing the separation of the optical fiber holder 2 from the continuous protective tube 3.

[0061] Specifically, if Figure 1 and Figure 2 As shown, the temperature measuring optical fiber 1 includes an optical fiber bundle 101, an armored steel belt 103, a high-strength steel wire 104 and a PE outer sheath 105. The armored steel belt 103 is a tubular structure. The optical fiber bundle 101 is arranged in the armored steel belt 103. The armored steel belt 103 is filled with a PE filling layer 102. The PE outer sheath 105 is wrapped around the outer surface of the armored steel belt 103. The high-strength steel wire 104 is evenly installed between the armored steel belt 103 and the PE outer sheath 105, and the end of the high-strength steel wire 104 close to the optical fiber holder 2 is locked in the docking groove 206.

[0062] The PE filling layer 102 is used to protect the optical fiber bundle 101 to prevent the optical fiber bundle 101 from being damaged when being bent.

[0063] The armor steel tape 103 serves as a rigid protection for the outside of the optical fiber bundle 101 .

[0064] A total of four high-strength steel wires 104 are arranged outside the armored steel belt 103. The high-strength steel wires 104 are all fixed in the docking groove 206 to bear the tension when pulling the optical fiber.

[0065] The PE outer sheath 105 is used to buffer the external force of the optical fiber.

[0066] Specifically, the inner wall of the continuous protective tube 3 is smoothed and coated with lubricating oil to reduce the internal resistance of the continuous protective tube 3 and to smoothly separate the continuous protective tube 3 from the temperature measuring optical fiber 1 .

[0067] Specifically, an explosion-proof housing is provided outside the optical fiber temperature measuring analyzer 5 .

[0068] Embodiment 2

[0069] The method for detecting the fire source in the goaf by arranging the temperature measuring optical fiber in a directional long borehole, using the device for detecting the fire source in the goaf by arranging the temperature measuring optical fiber in a directional long borehole as in the first embodiment, specifically comprises the following steps:

[0070] S1, when there are signs of spontaneous combustion in the goaf of the coal mine, the predetermined drilling trajectory is designed according to the spatial distribution of the tunnel and the goaf;

[0071] Design the predetermined drilling trajectory, which is divided into the following three options:

[0072] a, such as Figure 8 As shown, when the air inlet and return air lanes of the goaf 14 of the mining face are sealed, a directional drilling machine 6 is designed to be set in front of the goaf 15 of the two lanes, and each directional drilling machine 6 constructs a number of directional boreholes 10. The trajectory of each directional borehole 10 is an arc. The directional boreholes constructed by the two directional drilling machines 6 are located in the upper and lower layers respectively, and are staggered to form a temperature measurement network;

[0073] The distance between the upper directional drilling hole 10 and the bottom of the goaf is 0.5 m, and the distance between the lower directional drilling hole 10 and the bottom of the goaf is 1 m;

[0074] In the actual temperature measurement process, the temperature difference between the upper and lower groups of temperature measuring optical fibers 1 can be obtained according to the respective temperatures of the two temperature measuring optical fibers 1 at the intersection point, and then the actual temperature of each position of the lower temperature measuring optical fiber 1 at the upper position can be calculated, so as to achieve more accurate temperature determination;

[0075] b, such as Fig. 9As shown, when the work in the goaf 14 has been completed and there is no adjacent drift tunnel in the goaf 14, it is designed to construct several directional drill holes 10 in the main tunnel of the mining area adjacent to the goaf 14 toward the goaf 14, and each directional drill hole 10 is arranged in parallel on the plane;

[0076] Temperature measuring optical fibers 1 are placed in the parallel directional drill holes 10 to form a temperature measuring network, so as to more accurately measure the temperature and determine the high temperature center 13;

[0077] c, such as Fig.10 As shown, when there is an adjacent drift tunnel in the goaf 14, it is designed to construct a number of directional drill holes 10 in the adjacent drift tunnel toward the goaf 14, and each directional drill hole 10 is arranged in parallel on a plane;

[0078] Temperature measuring optical fibers 1 are placed in the parallel directional drill holes 10 to form a temperature measuring network, which can more accurately measure the temperature and determine the high temperature center 13;

[0079] S2, such as Figure 5 As shown, according to the predetermined drilling trajectory, a directional drilling machine 6 is used to construct a directional drilling 10;

[0080] The output end of the directional drilling machine 6 is equipped with a drill rod 7, and the front end of the drill rod 7 is equipped with an inclinometer unit 9 and a directional drill bit 8. The inclinometer unit 9 is used to monitor the actual drilling trajectory in real time;

[0081] The distance between the directional drilling hole 10 and the bottom of the goaf is 0.5m to 1m;

[0082] S3, after the directional drilling 10 is completed, the roller 4 with the continuous protective tube 3 is transported to the hole mouth, the temperature measuring optical fiber 1 is pre-placed inside the continuous protective tube 3, the front end of the temperature measuring optical fiber 1 is connected to the rear end of the optical fiber holder 2, and the front end of the continuous protective tube 3 is inserted into the docking groove 206 of the optical fiber holder 2;

[0083] S4, such as Figure 6 As shown, the driving roller 4 rotates forward, and one end of the continuous protective tube 3 is unfolded from the roller 4, pushing the optical fiber holder 2 into the directional drilling hole 10. During the advancement of the optical fiber holder 2 in the directional drilling hole 10, the wing plate 203 compresses the wing plate spring 204 under the restriction of the borehole wall, and the wing plate 203 is in a contracted state, which does not affect the advancement of the optical fiber holder 2. As the roller 4 rotates, the continuous protective tube 3 pushes the optical fiber holder 2 to the set position at the bottom of the directional drilling hole 10;

[0084] S5, such as Figure 7As shown, the driving roller 4 is reversed, and the continuous protective tube 3 is rewound onto the roller 4 under the drive of the roller 4, and the continuous protective tube 3 is separated from the docking groove 206 on the optical fiber holder 2, and gradually moves out of the directional drilling hole 10. At the same time, when the optical fiber holder 2 retreats to the outside of the directional drilling hole 10, the wing plate 203 is expanded outwardly under the action of the wing plate spring 204, and the protrusion 2031 at the tail of the wing plate 203 penetrates into the coal wall, preventing the optical fiber holder 2 from further moving to the outside of the drilling hole. One end of the temperature measuring optical fiber 1 is fixed to the rear of the optical fiber holder 2, so when the continuous protective tube 3 is moved out of the drilling hole, the temperature measuring optical fiber 1 is separated from the continuous protective tube 3. After the continuous protective tube 3 is completely moved out of the drilling hole, the temperature measuring optical fiber 1 remains in the directional drilling hole 10, completing the arrangement of the temperature measuring optical fiber 1.

[0085] S6, connecting the hole end of the temperature measuring optical fiber 1 to the optical fiber temperature measuring analyzer 5, displaying the temperature of the temperature measuring optical fiber 1 through the optical fiber temperature measuring analyzer 5, measuring the average temperature of the temperature measuring optical fiber 1 every 1m to 2m, and recording it as a data node 11;

[0086] S7, repeat steps S2 to S6, arrange several temperature measuring optical fibers 1 at the bottom of the goaf to form a temperature measuring network, monitor the temperature data of the data nodes 11 in real time, draw the isotherms 12 of the temperature distribution in the goaf, mark the obvious high-temperature center 13 inside the goaf, so as to determine the location of spontaneous combustion of the coal seam.

[0087] like Fig.11 As shown, taking scheme c as an example, after completing the work of designing the predetermined drilling trajectory, constructing the directional drilling 10, and arranging the temperature measuring optical fiber 1, the isotherm 12 of the temperature distribution of the goaf 14 is drawn through the optical fiber temperature measuring analyzer 5 and the external computer, and the obvious high temperature center 13 is marked to determine the spontaneous combustion position of the coal seam. Fig.11 The smallest circular isotherm 12 is the location of the high temperature center 13.

[0088] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present invention. As long as these changes do not deviate from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A device for detecting fire sources in goafs by arranging temperature measuring optical fibers in directional long boreholes is arranged in directional boreholes and is characterized by: It includes a temperature measuring optical fiber, an optical fiber holder, a continuous protective tube, a roller and an optical fiber temperature measuring analyzer. The temperature measuring optical fiber is arranged in the continuous protective tube, and one end of the temperature measuring optical fiber is fixedly installed on the rear end of the optical fiber holder. The roller and the optical fiber temperature measuring analyzer are arranged outside the directional drilling hole, and one end of the continuous protective tube is wound on the roller, and the other end of the temperature measuring optical fiber is connected to the optical fiber temperature measuring analyzer. The optical fiber holder includes a pointed head, a wing plate shaft, a wing plate, a wing plate spring, a central column and a docking groove, wherein the pointed head and the docking groove are respectively integrally formed at the front and rear ends of the central column, and the temperature measuring optical fiber is fixedly installed in the docking groove, the inner diameter of the docking groove is the same as the outer diameter of the continuous protective tube, and the other end of the continuous protective tube is inserted into the docking groove, the outer circumference of the central column is symmetrically fixedly installed with the wing plate shaft, and the wing plate is rotatably assembled on the wing plate shaft, the outer circumference of the central column is equipped with one end of the wing plate spring, and the other end of the wing plate spring is fixedly installed on the wing plate, and the outer end of the wing plate is integrally formed with a protrusion.

2. The device for detecting fire sources in goaf areas by arranging temperature measuring optical fibers in directional long boreholes according to claim 1, characterized in that: The temperature measuring optical fiber includes an optical fiber bundle, an armored steel belt, a high-strength steel wire and a PE outer sheath. The armored steel belt is a tubular structure. The optical fiber bundle is arranged inside the armored steel belt. The armored steel belt is filled with a PE filling layer. The PE outer sheath is wrapped around the outer surface of the armored steel belt. High-strength steel wires are evenly installed between the armored steel belt and the PE outer sheath, and one end of the high-strength steel wire close to the optical fiber holder is locked in the docking groove.

3. The device for detecting fire sources in goaf areas by arranging temperature measuring optical fibers through directional long drilling holes according to claim 1, characterized in that: The inner wall of the continuous protective tube is smoothed and coated with lubricating oil.

4. The device for detecting fire sources in goaf areas by arranging temperature measuring optical fibers through directional long drilling holes as described in claim 1, characterized in that: An explosion-proof housing is arranged outside the optical fiber temperature measuring and analyzing instrument.

5. A method for detecting fire sources in goafs by arranging temperature measuring optical fibers in directional long boreholes, using the device for detecting fire sources in goafs by arranging temperature measuring optical fibers in directional long boreholes as claimed in any one of claims 1 to 4, specifically comprising the following steps: S1, when there are signs of spontaneous combustion in the goaf of the coal mine, the predetermined drilling trajectory is designed according to the spatial distribution of the tunnel and the goaf; S2, using a directional drilling machine to perform directional drilling according to a predetermined drilling trajectory; S3, after the directional drilling construction is completed, the roller with the continuous protective tube is transported to the hole mouth, the temperature measuring optical fiber is pre-placed inside the continuous protective tube, the front end of the temperature measuring optical fiber is connected to the rear end of the optical fiber holder, and the front end of the continuous protective tube is inserted into the docking groove of the optical fiber holder; S4, the driving roller rotates forward, one end of the continuous protective tube is unfolded from the roller, and the optical fiber holder is pushed into the directional drilling hole. During the advancement of the optical fiber holder in the directional drilling hole, the wing plate compresses the wing plate spring under the restriction of the borehole wall, and the wing plate is in a contracted state, which does not affect the advancement of the optical fiber holder. As the roller rotates, the continuous protective tube pushes the optical fiber holder to the set position at the bottom of the directional drilling hole; S5, the driving roller is reversed, and the continuous protective tube is rewound onto the roller under the drive of the roller, and the continuous protective tube is separated from the docking groove on the optical fiber holder and gradually moves out of the directional drilling hole. At the same time, when the optical fiber holder retreats to the outside of the directional drilling hole, the wing plate is expanded outward under the action of the wing plate spring, and the protrusion at the tail of the wing plate pierces the coal wall to prevent the optical fiber holder from moving further to the outside of the drilling hole. One end of the temperature measuring optical fiber is fixed to the rear of the optical fiber holder. Therefore, when the continuous protective tube is moved out of the drilling hole, the temperature measuring optical fiber is separated from the continuous protective tube. After the continuous protective tube is completely moved out of the drilling hole, the temperature measuring optical fiber remains in the directional drilling hole, and the arrangement of the temperature measuring optical fiber is completed. S6, connecting the orifice end of the temperature measuring optical fiber to the optical fiber temperature measuring analyzer, displaying the temperature of the temperature measuring optical fiber through the optical fiber temperature measuring analyzer, measuring the average temperature of the temperature measuring optical fiber every 1m to 2m, and recording it as a data node; S7, repeat steps S2 to S6, arrange several temperature measuring optical fibers at the bottom of the goaf to form a temperature measuring network, monitor the temperature data of the data nodes in real time, draw isotherms of the temperature distribution in the goaf, mark the obvious high-temperature center inside the goaf, and thus determine the location of spontaneous combustion of the coal seam.

6. The method for detecting fire sources in goaf areas by arranging temperature measuring optical fibers through directional long drilling holes as described in claim 5, characterized in that: In step S1, the design of the predetermined drilling trajectory is divided into the following three schemes: a. When the air inlet and return air lanes in the goaf of the mining face are closed, a directional drilling rig is designed to be set up in front of the closed goaf of the two lanes. Each directional drilling rig constructs several directional boreholes, and the trajectory of each directional borehole is an arc. The directional boreholes constructed by the two directional drilling rigs are located in the upper and lower layers respectively, and are staggered to form a temperature measurement network; b. When the work in the goaf has been completed and there is no adjacent drift in the goaf, it is designed to construct several directional drill holes in the main lane of the mining area adjacent to the goaf towards the goaf, and each directional drill hole is arranged in parallel on the plane; c. When there are adjacent drift tunnels in the goaf, it is designed to construct several directional drill holes from the adjacent drift tunnels toward the goaf, and each directional drill hole is arranged in parallel on the plane.

7. The method for detecting fire sources in goaf areas by arranging temperature measuring optical fibers through directional long drilling holes as described in claim 6, characterized in that: In scheme a, the distance between the upper directional drill hole and the bottom of the goaf is 0.5 m, and the distance between the lower directional drill hole and the bottom of the goaf is 1 m.

8. The method for detecting fire sources in goaf areas by arranging temperature measuring optical fibers through directional long drilling holes as described in claim 5, characterized in that: In step S2, the output end of the directional drilling rig is equipped with a drill rod, and the front end of the drill rod is equipped with an inclinometer unit and a directional drill bit, and the inclinometer unit is used to monitor the actual drilling trajectory in real time.

9. The method for detecting fire sources in goaf areas by arranging temperature measuring optical fibers through directional long drilling holes as described in claim 5, characterized in that: In step S2, the distance between the directional drilling hole and the bottom of the goaf is 0.5m to 1m.

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