A deployable fire-powered slotting device

Abstract

This invention discloses a deployable fire-operated slotting device, comprising a deployable fire-operated slotting nozzle and a gas pipeline, which are connected by a heat-insulating hose. The fire-operated slotting nozzle includes two parallel semi-circular heat-insulating tubes, the tails of which are connected to the gas pipeline via heat-insulating hoses. A sleeve is provided on the rear half of the semi-circular heat-insulating tubes and the outer side of the heat-insulating hoses. A horizontally arranged pin and steel wire rope are welded inside the sleeve. In the borehole, the fire-operated slotting nozzle moves the sleeve backward by pulling the steel wire rope, releasing the two semi-circular heat-insulating tubes and the heat-insulating hoses from the sleeve's constraint. The two semi-circular heat-insulating tubes unfold under the traction of the spring and the steel wire rope, forming a T-shaped structure. After ignition and with dragging, it can achieve directional fire-operated slotting in the borehole, forming a wider slot, thereby obtaining a larger free surface in the coal seam, reducing drilling volume, and improving pressure relief.

Description

Technical Field

[0001] This invention relates to the field of coal mining, and more specifically to a deployable fire-powered slotting device. Background Technology

[0002] In mines lacking the conditions for extracting protective layers, intensive drilling and hydraulic fracturing are common methods for controlling coal gas. Intensive drilling involves large-scale construction, long cycles, and high costs; hydraulic fracturing is ineffective in hard coal seams, making it difficult to create wide gaps, and slag removal is difficult during parallel and downward drilling, leading to frequent drill jamming and stuck drill bits. These factors restrict the development of this technology, and the control costs also become a burden for coal mining enterprises.

[0003] Fire-assisted slotting in boreholes is a novel method of creating slots. Currently, the main method for achieving fire-assisted slotting in boreholes involves continuously introducing an oxidizer and a reducing agent into the borehole, igniting and sustaining combustion. This converts a portion of the coal seam into combustible gas, which is then extracted, thereby expanding the free surface of the borehole and achieving greater pressure relief over a single borehole. Although existing technologies can create relatively large cavities in coal seams, directional fire-assisted slotting is not yet feasible. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, a deployable fire-powered slotting device is provided. By deploying the flame head, a larger area of ​​slotting is achieved, significantly reducing the number of boreholes required. The continuous combustion and scouring of the coal seam by the flame causes the coal to burn in the direction of the flame, consuming it and creating artificial slots. Simultaneously, thermal stress is generated within the coal seam, causing it to break and swell under thermal stress, resulting in larger slots within the borehole. Furthermore, by controlling the injection ratio of oxidizer and reductant, a surplus of oxidizer is maintained, which can consume methane gas entering the borehole from the coal seam and reduce methane escape into the roadway.

[0005] To solve the above-mentioned technical problems, the present invention provides a deployable fire-powered slit-cutting device, comprising a deployable fire-powered slit-cutting nozzle and a gas pipeline, wherein the fire-powered slit-cutting nozzle and the gas pipeline are connected by a heat-insulated flexible hose.

[0006] The fire-cutting nozzle includes two semi-circular heat-insulating tubes arranged side by side. The two semi-circular heat-insulating tubes are combined to form a cylinder. The tails of the two semi-circular heat-insulating tubes are connected to the gas pipeline through heat-insulating hoses. The rear half of the semi-circular heat-insulating tubes and the outside of the heat-insulating hoses are provided with sleeves.

[0007] Each of the two semicircular heat insulation tubes is equipped with a nozzle. A paperclip-shaped spring is located between the two semicircular heat insulation tubes to facilitate their unfolding. The exterior of each semicircular heat insulation tube has a locking groove for merging and locking them together. A fixing pin is installed in each groove to connect the two semicircular heat insulation tubes and compress the paperclip spring. Each of the two semicircular heat insulation tubes has a locking groove on its left and right sides. The fixing pin is inserted into the locking groove between the left and right semicircular heat insulation tubes to lock them in place. A steel wire rope is connected to the locking pin, and the other end of the steel wire rope is welded to the upper surface of the sleeve. A transverse... A pin is installed, connected to a steel wire rope. The heat insulation pipe has a pin groove that matches the pin. The fire cutting nozzle moves the casing backward by pulling the steel wire rope in the drill hole, thereby releasing the two semi-circular heat insulation pipes and the heat insulation hose from the casing. By pulling the slotted steel wire rope, the fixing pin is disengaged from the slot. The two semi-circular heat insulation pipes unfold under the action of the spring, forming a "Y" shape. Further pulling the steel wire rope makes the casing continue to move downward. The downward movement of the casing drives the external steel wire rope to further unfold the two semi-circular heat insulation pipes, ultimately forming a "T" shape with the gas pipeline.

[0008] The semi-circular heat insulation tube includes two parallel oxidant branch pipes and a reducing agent branch pipe, with an ignition needle and a temperature probe between the oxidant branch pipe and the reducing agent branch pipe;

[0009] The gas pipeline includes an ignition wire, a temperature measuring wire, an oxidant tube, and a reducing agent tube, which are respectively connected to a semi-circular heat insulation tube. The ignition wire, temperature measuring wire, oxidant tube, and reducing agent tube are wrapped with heat insulation tubes. The tail ends of the oxidant tube and the reducing agent tube are respectively equipped with one-way valves to prevent internal gas backflow.

[0010] Furthermore, after the fixing pin on the semi-circular heat insulation tube disengages from the slot, it bends along the heat insulation hose under the action of the spring, with the maximum bending angle being right angled to the heat insulation tube.

[0011] Furthermore, the steel wire rope drives the sleeve to slide on the heat insulation pipe and the heat insulation hose. The grooved steel wire rope and the outer steel wire rope are linked with the steel wire rope on the sleeve. When the steel wire rope is pulled, the sleeve slides along the pin groove preset in the heat insulation pipe. When the groove is pulled to disengage, the sleeve slides just below the center of the heat insulation hose, thereby getting rid of the sleeve restriction.

[0012] Furthermore, after the slot is disengaged, the spring separates the two semi-circular heat insulation tubes, and under the tension of the external steel wire rope, they further open to be perpendicular to the heat insulation tubes.

[0013] Furthermore, multiple nozzles are provided on the top and outer sides of the two semi-circular heat insulation tubes. When the cutting device enters the bottom of the borehole, it controls the two semi-circular heat insulation tubes to unfold and form a "T" shape with the gas pipeline. The flame is ignited and sprayed out to the rear and sides through the nozzles. Then the entire cutting device is dragged towards the borehole entrance along with the gas pipeline, realizing cutting while dragging.

[0014] Furthermore, the ignition needle and temperature probe inside the semi-circular heat insulation tube are positioned between the oxidant branch tube and the reducing agent branch tube, with the tip of the ignition needle higher than the temperature probe.

[0015] Furthermore, the ignition needle is connected to a ground ignition device via an ignition wire, enabling remote ignition. The temperature is then displayed remotely via a temperature probe to confirm successful ignition and to show the internal combustion temperature.

[0016] Furthermore, when the sleeve completely covers the heat insulation hose, the heat insulation tube and the semi-circular heat insulation tube are in a straight line.

[0017] The beneficial effects of this invention are as follows:

[0018] This device is used for coal seam depressurization and permeability enhancement, changing the traditional hydraulic cutting to fire-powered cutting. Its expandable design significantly increases the cutting area, greatly reducing the workload of traditional dense drilling for depressurization and permeability enhancement in coal seams. Compared to hydraulic cutting, this device requires less water, reducing water consumption and eliminating the "water-locking" effect on the coal seam during the cutting process. This device is not limited to soft coal seams and is also applicable to hard coal seams. During operation, the device continuously consumes gas in the coal seam, reducing the disorderly release of gas into roadways or goaf areas. The device heats the coal body during the cutting process, promoting gas release and thus improving extraction concentration and efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a deployable fire-powered slotting device (drilling state) provided in an embodiment of the present invention.

[0021] Figure 2 A partial cross-sectional view of a deployable fire-powered slit-cutting device provided in an embodiment of the present invention.

[0022] Figure 3This invention provides an embodiment of the internal structure diagram of a semi-circular heat insulation tube (2) in a deployable fire cutting device.

[0023] Figure 4 A schematic diagram of the spring (3) of a deployable fire cutting device provided in an embodiment of the present invention when it is opened.

[0024] Figure 5 This is a schematic diagram of a deployable fire-powered slit cutting device when fully deployed, as provided in an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Nozzle; 2. Semi-circular heat insulation tube; 3. Spring; 4. Fixing pin; 5. Slot; 6. Slotted steel wire rope; 7. Heat insulation hose; 8. Sleeve; 9. External steel wire rope; 10. Heat insulation tube; 11. Ignition wire; 12. Temperature measuring wire; 13. Oxidant tube; 14. Reducing agent tube; 15. Steel wire rope; 16. One-way valve; 17. Oxidant branch pipe; 18. Reducing agent branch pipe; 19. Temperature probe; 20. Ignition needle; 8-1. Pin; 10-1. Pin groove. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, a deployable fire-powered slit-cutting device is characterized by comprising a deployable fire-powered slit-cutting nozzle and a gas pipeline, wherein the fire-powered slit-cutting nozzle and the gas pipeline are connected by a heat-insulating flexible hose 7.

[0029] The fire-cutting nozzle includes two semi-circular heat-insulating tubes 2 arranged side by side. The two semi-circular heat-insulating tubes 2 are combined to form a cylinder. The tails of the two semi-circular heat-insulating tubes 2 are respectively connected to the gas pipeline through heat-insulating hoses 7. The rear half of the semi-circular heat-insulating tubes 2 and the outside of the heat-insulating hoses 7 are provided with sleeves 8. When the sleeves 8 completely cover the heat-insulating hoses 7, the heat-insulating tubes 10 and the semi-circular heat-insulating tubes 2 are in a straight line.

[0030] like Figure 2 and Figure 3As shown, each of the two semicircular heat insulation tubes 2 is equipped with a nozzle 1. A paperclip-shaped spring 3 is provided between the two semicircular heat insulation tubes 2 to facilitate their unfolding. The exterior of each of the two semicircular heat insulation tubes 2 is provided with a slot 5 for locking them together. A fixing pin 4 is provided on the slot 5 to connect the two semicircular heat insulation tubes 2 and compress the paperclip spring 3. A slot 5 is provided on each of the left and right sides of each of the two semicircular heat insulation tubes 2. The fixing pin 4 is inserted into the slot 5 between the left and right semicircular heat insulation tubes 2 to lock them in place. The fixing pin 4 is connected to a slot wire. Rope 6, the other end of the grooved steel wire rope 6 is welded to the upper surface of the sleeve 8; a horizontally arranged pin 8-1 is welded inside the sleeve 8, and the pin 8-1 is connected to the steel wire rope 15. The heat insulation pipe 10 has a pin groove that matches the pin 8-1. The fire cutting nozzle moves the sleeve 8 backward in the borehole by pulling the steel wire rope 15, thereby releasing the two semi-circular heat insulation pipes 2 and the heat insulation hose 7 from the constraint of the sleeve 8. By pulling the grooved steel wire rope 6, the fixing pin 4 is disengaged from the groove 5. The two semi-circular heat insulation pipes 2 unfold under the action of the spring 3 to form a "Y" shaped structure, such as Figure 4 As shown, the external steel wire rope 9 is connected to the semi-circular heat insulation pipe 2. Further pulling the steel wire rope 15 causes the sleeve 8 to continue moving downwards. The downward movement of the sleeve 8 drives the external steel wire rope 9 to further unfold the two semi-circular heat insulation pipes 2, ultimately forming a "T" shape with the gas pipeline. That is, after the fixing pin 4 on the semi-circular heat insulation pipe 2 disengages from the slot 5, it bends along the heat insulation hose 7 under the action of the spring 3, with the maximum bending angle forming a right angle with the heat insulation pipe 10. Figure 5 As shown;

[0031] The semi-circular heat insulation pipe 2 includes two oxidant branch pipes 17 and reductant branch pipes 18 arranged side by side, and an ignition needle 20 and a temperature probe 19 are provided between the oxidant branch pipes 17 and the reductant branch pipes 18.

[0032] The gas pipeline includes an ignition wire 11, a temperature measuring wire 12, an oxidant tube 13, and a reducing agent tube 14, which are respectively connected to the semi-circular heat insulation tube 2. The ignition wire 11, the temperature measuring wire 12, the oxidant tube 13, and the reducing agent tube 14 are wrapped with heat insulation tubes 10. The tail ends of the oxidant tube 13 and the reducing agent tube 14 are respectively equipped with one-way valves 16 to prevent the backflow of internal gas.

[0033] The steel wire rope 15 drives the sleeve 8 to slide on the heat insulation pipe 10 and the heat insulation hose 7. The slotted steel wire rope 6 and the outer steel wire rope 9 are both linked with the steel wire rope 15 on the sleeve 8. When the steel wire rope 15 is pulled, the sleeve 8 slides along the pin groove 10-1 preset in the heat insulation pipe 10. When the slot 5 is pulled to disengage, the sleeve 8 slides just below the center of the heat insulation hose 7, thus getting rid of the restriction of the sleeve 8.

[0034] The ignition needle 20 and temperature probe 19 inside the semi-circular heat-insulating tube 2 are positioned between the oxidant branch tube 17 and the reducing agent branch tube 18, with the end of the ignition needle 20 higher than the temperature probe 19. The ignition needle 20 is connected to the ground ignition device via the ignition wire 11, enabling remote ignition. The temperature probe 19 displays the temperature remotely to confirm successful ignition and shows the internal combustion temperature. Multiple nozzles 1 are provided on the top and outer sides of the two semi-circular heat-insulating tubes 2. When the cutting device enters the bottom of the borehole, it controls the two semi-circular heat-insulating tubes 2 to unfold and form a "T" shape with the gas pipeline. Ignition occurs, and flames are ejected backward and to the sides through the nozzles. Then, the entire cutting device is dragged towards the borehole entrance along with the gas pipeline, achieving simultaneous dragging and cutting.

[0035] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An expandable flame slotting device, characterized by: Includes deployable fire-cutting nozzles and gas pipelines, which are connected by a heat-insulated hose (7); The fire-cutting nozzle includes two semi-circular heat-insulating tubes (2) arranged side by side. The two semi-circular heat-insulating tubes (2) are combined to form a cylinder. The tails of the two semi-circular heat-insulating tubes (2) are connected to the gas pipeline through heat-insulating hoses (7). The rear half of the semi-circular heat-insulating tubes (2) and the outside of the heat-insulating hoses (7) are provided with sleeves (8). Two semicircular heat insulation tubes (2) are respectively provided with nozzles (1), and a paperclip spring (3) is provided between the two semicircular heat insulation tubes (2) to facilitate the unfolding of the two semicircular heat insulation tubes (2). The two semicircular heat insulation tubes (2) are respectively provided with slots (5) for locking the two semicircular heat insulation tubes (2) together. The slots (5) are provided with fixing pins (4) that connect the two semicircular heat insulation tubes (2) and compress the paperclip spring (3). There is a slot (5) on each side of the two semicircular heat insulation tubes (2). The fixing pin (4) is inserted into the slot (5) between the two semicircular heat insulation tubes (2) to lock the semicircular heat insulation tubes (2). The fixing pin (4) is connected to the slot steel wire rope (6). The other end of the slot steel wire rope (6) is welded to the upper surface of the sleeve (8). The sleeve (8) is welded with a horizontally arranged pin (8-1). The pin (8-1) is connected to a steel wire rope ( 15) The heat insulation pipe (10) is provided with a pin groove that matches the pin (8-1). The fire cutting nozzle pulls the steel wire rope (15) in the drill hole, pulls the slotted steel wire rope (6) so that the fixing pin (4) is disengaged from the slot (5), and moves the sleeve (8) backward, so that the two semi-circular heat insulation pipes (2) and the heat insulation hose (7) are released from the sleeve (8). The two semi-circular heat insulation pipes (2) unfold under the action of the spring (3) to form a "Y" shape structure. The steel wire rope (15) is pulled further to make the sleeve (8) continue to move down. The sleeve (8) moves down and drives the external steel wire rope (9) to further drive the two semi-circular heat insulation pipes (2) to unfold, so that the two semi-circular heat insulation pipes (2) and the gas pipeline form a "T" shape structure. The external steel wire rope (9) is connected to the semi-circular heat insulation pipe (2). The external steel wire rope (9) is linked with the steel wire rope (15) on the sleeve (8). The semi-circular heat insulation pipe (2) includes two parallel oxidant branch pipes (17) and reducing agent branch pipes (18), with an ignition needle (20) and a temperature probe (19) between the oxidant branch pipes (17) and the reducing agent branch pipes (18). The gas pipeline includes an ignition wire (11), a temperature measuring wire (12), an oxidant pipe (13), and a reducing agent pipe (14) that are respectively connected to a semi-circular heat insulation pipe (2). The ignition wire (11), the temperature measuring wire (12), the oxidant pipe (13), and the reducing agent pipe (14) are wrapped with heat insulation pipes (10). The tail ends of the oxidant pipe (13) and the reducing agent pipe (14) are respectively equipped with one-way valves (16) to prevent the internal gas from flowing back.

2. A deployable flame slot device as claimed in claim 1, characterized in that: After the fixing pin (4) on the semi-circular heat insulation tube (2) is released from the slot (5), it bends along the heat insulation hose (7) under the action of the spring (3), and the maximum bending angle is right angle with the heat insulation tube (10).

3. A deployable flame slot device as claimed in claim 1, wherein: The steel wire rope (15) drives the sleeve (8) to slide on the heat insulation pipe (10) and the heat insulation hose (7). The slotted steel wire rope (6) and the outer steel wire rope (9) are linked with the steel wire rope (15) on the sleeve (8). When the steel wire rope (15) is pulled, the sleeve (8) slides along the pin groove (10-1) preset in the heat insulation pipe (10). When the slot (5) is pulled to disengage, the sleeve (8) slides just below the center of the heat insulation hose (7), thus getting rid of the restriction of the sleeve (8).

4. A deployable flame slot device as claimed in claim 1, wherein: Multiple nozzles (1) are provided on the top and outer sides of the two semi-circular heat insulation tubes (2). When the cutting device enters the bottom of the borehole, the two semi-circular heat insulation tubes (2) are controlled to unfold and form a "T" shape with the gas pipeline. The flame is ignited and sprayed out to the rear and side through the nozzles. Then the entire cutting device is dragged towards the borehole entrance along with the gas pipeline to achieve cutting while dragging.

5. An expandable flame slot device as defined in claim 1, wherein: The ignition needle (20) and temperature probe (19) inside the semi-circular heat insulation tube (2) are located between the oxidant branch tube (17) and the reducing agent branch tube (18), and the end of the ignition needle (20) is higher than the temperature probe (19).

6. A deployable flame slot device as claimed in claim 5, characterised in that: The ignition needle (20) is connected to the ground ignition device via the ignition wire (11), enabling remote ignition. The temperature is displayed remotely via the temperature probe (19) to confirm successful ignition and to display the internal combustion temperature.

7. An expandable flame cutting apparatus as defined in claim 1, wherein: When the sleeve (8) completely covers the heat insulation hose (7), the heat insulation pipe (10) and the semi-circular heat insulation pipe (2) are in a straight line.

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