A positive and negative pressure inerting system and method for rapid fire prevention and extinguishing in goaf areas

Abstract

The present invention relates to a positive and negative pressure injection inerting system and method for rapid fire prevention and extinguishing in goafs, belonging to the field of fire prevention and extinguishing in goafs; it solves the problem of poor fire extinguishing effect of existing fire extinguishing methods in goafs; the technical solution is: it includes a first gas injection main pipe and a plurality of air collecting devices, the air collecting devices are placed in the first gas injection main pipe, the air collecting devices and the first gas injection main pipe are gap-matched, the first gas injection main pipe is connected to the gas injection equipment, an air flow channel is provided through the air collecting device, the air collecting air inlet of the air flow channel is interconnected with the first gas injection main pipe, the air collecting air outlet of the air flow channel is connected to a pumping branch pipe, the low-pressure part of the air flow channel is connected to one end of the main drilling pipe through a gas return pipe, the gas return pipe and the air flow channel are interconnected, the main drilling pipe is arranged in the goaf, and the other end of the main drilling pipe is connected to the second gas injection main pipe, so as to achieve the effect of rapid fire extinguishing coordinated by pumping and injection; the present invention is applied to fire prevention and extinguishing in goafs.

Description

Technical Field

[0001] The invention provides a positive and negative pressure inerting system and method for rapid fire prevention and extinguishing in goaf areas, belonging to the technical field of fire prevention and extinguishing in goaf areas. Background Art

[0002] As coal mining depths continue to increase, a large amount of residual coal remains in the goaf during the mining process of fully mechanized caving working faces. Goafs are prone to spontaneous combustion due to air leakage. In the early stages of spontaneous combustion, the rapid injection of inert gas can be used to extinguish the fire. Nitrogen does not support combustion and has a higher density than air. This creates an inert area in the goaf, reduces oxygen concentration, and thus suppresses coal spontaneous combustion. However, traditional goaf fire extinguishing methods have the following problems:

[0003] First, the drilling arrangement is relatively simple and does not fully consider the three-dimensional space of the goaf, making it difficult to carry out comprehensive and effective fire extinguishing operations in the entire goaf. Usually, drilling holes are only arranged in some key locations, which cannot achieve three-dimensional fire prevention and extinguishing.

[0004] Second, due to the limitations of construction conditions and fire-fighting equipment, the inert gas is unevenly distributed and cannot effectively cover the entire fire area, resulting in excessive levels of toxic and harmful gases in the later stages, and in severe cases, may even cause a gas explosion;

[0005] 3. The nitrogen injection speed is slow and cannot quickly reduce the temperature of the fire area;

[0006] 4. The nitrogen injection flow and pressure are difficult to adjust accurately, which affects the fire extinguishing effect. Summary of the Invention

[0007] In order to solve the technical problems of poor fire extinguishing effect in existing goaf fire extinguishing methods, the present invention proposes a positive and negative pressure injection inerting system and method for rapid goaf fire prevention and extinguishing. The purpose is to improve the goaf nitrogen injection fire prevention and extinguishing system to increase the fire extinguishing speed and achieve the purpose of efficient fire extinguishing.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf areas, comprising a first gas injection main pipe and a plurality of air collecting devices, wherein the first gas injection main pipe is connected to the gas injection equipment, and the air collecting devices are placed in the first gas injection main pipe, and the air collecting devices and the first gas injection main pipe are in clearance fit;

[0009] The air collecting device is provided with an air flow channel, the air collecting air inlet of the air flow channel is communicated with the first gas injection main pipe, the air collecting air outlet of the air flow channel is connected to the extraction branch pipe, the low-pressure part of the air flow channel is connected to one end of the main drilling pipe through the gas return pipe, the gas return pipe and the air flow channel are mutually connected, the other end of the main drilling pipe is connected to the second gas injection main pipe, and a pressure pump is provided between the second gas injection main pipe and the first gas injection main pipe;

[0010] The main borehole pipe is provided with a plurality of drainage holes;

[0011] The main drilling pipeline is placed in the goaf.

[0012] Furthermore, the main drilling pipe and the second gas injection main pipe are connected to each other through a gas injection branch pipe, a sealing cover is provided between the gas injection branch pipe and the main drilling pipe, and a valve is provided between the gas injection branch pipe and the second gas injection main pipe.

[0013] Furthermore, an exhaust fan is rotatably connected to the gas return pipe at the connection point with the air flow channel.

[0014] Furthermore, the cross-sectional areas of the air collecting inlet portion and the air collecting outlet portion on the air flow channel are both larger than the cross-sectional area of the low-pressure portion.

[0015] Furthermore, a plurality of drainage components are provided in the main borehole pipe, and the drainage components cooperate with the drainage holes to deliver the gas flowing into the main borehole pipe into the goaf.

[0016] Furthermore, a gas return branch pipe is provided on the main drilling pipe, and the gas return branch pipe is connected to the gas return pipe.

[0017] Furthermore, the first gas injection main pipe and the air flow channel are parallel to each other.

[0018] Furthermore, the air collecting devices correspond to the main drilling pipes one by one, and the multiple main drilling pipes are parallel to each other.

[0019] Furthermore, the first gas injection main pipe, the pressure pump, the second gas injection main pipe and the main drilling pipeline form an air flow loop, forming a triangular structure.

[0020] A positive and negative pressure inerting method for rapid fire prevention and extinguishing in goafs adopts the positive and negative pressure inerting system for rapid fire prevention and extinguishing in goafs to extinguish fire in goafs.

[0021] The present invention has the following beneficial effects compared to the prior art:

[0022] 1. The first gas injection main pipe of the present invention cooperates with the air flow channel of the air collection device to form a low pressure in the low-pressure part of the air flow channel, that is, the air pressure inside the goaf is higher than the air pressure inside the air collection device, thereby generating a siphon effect. Under the action of the exhaust fan, toxic and harmful gases inside the goaf are efficiently sucked out;

[0023] 2. The main borehole pipe of the present invention is evenly distributed with a plurality of drainage holes. The drainage holes cooperate with the drainage components connected to the main borehole pipe to change the flow direction of the inert gas in the main borehole pipe, injecting the inert gas into the goaf through the drainage holes, so that the inert gas fully covers the goaf, thereby isolating oxygen and quickly extinguishing the fire;

[0024] 3. A valve is connected between the gas injection branch pipe and the second gas injection main pipe of the present invention. By controlling the valve, the flow rate and flow rate of nitrogen flowing into the second gas injection main pipe can be controlled, thereby achieving precise regulation of the flow rate and pressure of the injected inert gas and improving the fire extinguishing effect;

[0025] 4. The gas injection equipment, air collection device, first gas injection main pipe, second gas injection main pipe, main drilling pipe and extraction and discharge branch pipe of the present invention cooperate with each other to achieve the effect of rapid fire extinguishing by coordinated extraction and injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] Figure 1 Schematic diagram of the system structure of the present invention;

[0028] Figure 2 Schematic diagram of the structure of the wind collecting device of the present invention;

[0029] Figure 3 This is a schematic structural diagram of the main drilling pipeline of the present invention;

[0030] Figure 4 for Figure 3 Middle AA section view;

[0031] Figure 5 It is a structural diagram showing the cooperation between the drainage holes and the drainage baffle;

[0032] Figure 6 Schematic diagram of wind flow derived from drainage holes;

[0033] In the figure: 1 is the gas injection equipment, 2 is the air collecting device, 3 is the first gas injection main pipe, 4 is the pressure pump, 5 is the valve, 6 is the gas injection branch pipe, 7 is the sealing cover, 8 is the main drilling pipe, 9 is the drainage hole, 10 is the extraction branch pipe, 11 is the air collection inlet part, 12 is the air collection box, 13 is the low pressure part, 14 is the air flow channel, 15 is the gas return pipe, 16 is the air inlet, 17 is the exhaust fan, 18 is the air collection outlet part, 19 is the gas return branch pipe, 20 is the drainage baffle, 21 is the second gas injection main pipe, 22 is the connecting component, 23 is the fixing part, and 24 is the goaf. DETAILED DESCRIPTION

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate relative positions or positional relationships, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second" and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] like Figures 1 to 6 As shown, the present invention provides a positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf areas, comprising a first gas injection main pipe 3 and a plurality of air collecting devices 2. The air collecting devices 2 are placed within the first gas injection main pipe 3, with a certain distance between the air collecting devices 2 and the first gas injection main pipe 3 to allow gas to pass through the gap between the air collecting devices 2 and the first gas injection main pipe 3. The number of air collecting devices 2 is set according to the specific implementation environment. In this embodiment, three air collecting devices are provided.

[0037] The first gas injection pipe 3 is connected to the gas injection device 1 , and the gas injection device 1 injects fire extinguishing gas into the first gas injection pipe 3 . The fire extinguishing gas in this embodiment is an inert gas, specifically nitrogen.

[0038] The air collection device 2 includes an air collection box 12, which is penetrated by an air flow channel 14. The air collection inlet 11 of the air flow channel 14 is interconnected with the first gas injection main pipe 3. The air collection outlet 18 of the air flow channel 14 is connected to the extraction branch pipe 10. The low-pressure portion 13 of the air flow channel 14 is connected to one end of the main drilling pipe 8 via a gas return pipe 15. The gas return pipe 15 and the air flow channel 14 are interconnected. Specifically, the main drilling pipe 8 is connected to a gas return branch pipe 19, which is connected to the air inlet 16 of the gas return pipe 15 via the gas return branch pipe 19.

[0039] The main drilling pipes 8 are placed in the goaf 24 , and the main drilling pipes 8 correspond to the air collecting devices 2 one by one, and the multiple main drilling pipes 8 are parallel to each other.

[0040] The other end of the main borehole pipe 8 is connected to the second gas injection main pipe 21. A pressure pump 4 is connected between the second gas injection main pipe 21 and the first gas injection main pipe 3. The first gas injection main pipe 3, the pressure pump 4, the second gas injection main pipe 21, and the main borehole pipe 8 form an airflow loop. A certain angle is set between the main borehole pipe 8 and the first gas injection main pipe 3, and a certain angle is set between the main borehole pipe 8 and the second gas injection main pipe 21. The main borehole pipe 8, the first gas injection main pipe 3, and the second gas injection main pipe 21 form a triangular structure. Several drainage holes 9 are evenly distributed on the main borehole pipe 8, so that the main borehole pipe 8 is connected to the goaf 24.

[0041] Specifically, the main drilling pipeline 8 and the second gas injection main pipe 21 are interconnected through the gas injection branch pipe 6, and a sealing cover 7 is connected between the gas injection branch pipe 6 and the main drilling pipeline 8. The sealing cover 7 can control the on-off of the gas injection branch pipe 6 and the main drilling pipeline 8. A valve 5 is connected between the gas injection branch pipe 6 and the second gas injection main pipe 21. By controlling the valve 5 to control the flow rate and flow velocity of the nitrogen flowing into the second gas injection main pipe 21, it cooperates with the main drilling pipeline 8 to make the nitrogen injected into the goaf 24 evenly distributed, thereby achieving the purpose of fully covering the fire area of the goaf 24 with nitrogen.

[0042] The toxic and harmful gases and residual nitrogen in the goaf 24 are discharged after passing through the main drilling pipeline 8, the gas return branch pipe 19, the air flow channel 14 and the extraction branch pipe 10 in sequence.

[0043] Furthermore, the cross-sectional areas of the air collection inlet portion 11 and the air collection outlet portion 18 on the air flow channel 14 are both larger than the cross-sectional area of the low-pressure portion 13, so that the air flow channel 14 is narrow in the middle and wide at both ends. The air flow channel 14 is parallel to the first gas injection main pipe 3. When the gas passes through the air flow channel 14 quickly, a low pressure is formed at the connection between the low-pressure portion 13 of the air flow channel 14 and the gas return pipe 15, causing the air pressure inside the goaf 24 to be higher than the air pressure inside the air collection device 2, thereby generating a siphon effect, and then sucking out the toxic and harmful gases inside the goaf 24, and then the residual nitrogen is discharged together with the toxic and harmful gases through the extraction branch pipe 10. An exhaust fan 17 is also rotatably connected to the gas return pipe 15 at the connection with the air flow channel 14. When the toxic and harmful gases enter the air collection device 2 through the gas return pipe 15, the wind flow drives the exhaust fan 17 to rotate, further improving the efficiency of sucking out the toxic and harmful gases.

[0044] The main borehole pipe 8 is also connected to a number of drainage components, including a number of blade-shaped drainage baffles 20. The drainage baffles 20 are fixedly connected to the connection components 22, which are fixedly connected to the fixed portion 23 on the main borehole pipe 8. The drainage components cooperate with the drainage holes 9. The number of drainage components can be set according to the specific implementation situation. In this embodiment, each drainage component includes three drainage baffles 20. A certain inclination angle is set between the drainage baffles 20 and the main borehole pipe 8 according to the construction situation, so as to accurately deliver the gas input into the main borehole pipe 8 into the goaf 24. The specific structure of the blade-shaped drainage baffle 20 is a rectangle with a curved side. The thickness at the connection with the inner wall of the main borehole pipe 8 is greater than the thickness at the inner wall away from the main borehole pipe 8, which facilitates changing the direction of gas flow.

[0045] The present invention also provides a positive and negative pressure injection method for rapid fire prevention and extinguishing in goaf areas, and the goaf area 24 is extinguished by using the positive and negative pressure injection system for rapid fire prevention and extinguishing in goaf areas.

[0046] The working principle of the present invention is:

[0047] When the goaf 24 catches fire, the gas injection equipment 1, the pressure pump 4 and the sealing cover 7 are turned on, and the valve 5 is adjusted to allow the inert gas to be quickly injected into the first gas injection main pipe 3. The inert gas is divided into two paths in the first gas injection main pipe 3. One path quickly passes through the air flow channel 14 of the wind collecting device 2. Based on the Venturi effect, a low pressure is formed in the low-pressure part 13 of the wind collecting device 2, causing the air pressure inside the goaf 24 to be higher than the air pressure inside the wind collecting device 2. The toxic and harmful gases inside the goaf 24 are sucked out through the main drilling pipe 8, the gas return branch pipe 19 and the gas return pipe 15, and discharged through the extraction branch pipe 10; one path passes through the gap between the wind collecting device 2 and the first gas injection main pipe 3, and a part of it is injected into the next wind collecting device 2, and the rest passes through the collecting device 2. The gap between the wind device 2 and the first gas injection main pipe 3 is injected into the pressure booster pump 4, and after the pressure is increased by the pressure booster pump 4, it is injected into the goaf 24 in turn through the second gas injection main pipe 21, multiple main drilling pipes 8 and drainage holes 9, so that the nitrogen effectively and comprehensively covers the goaf 24 to isolate oxygen. The toxic and harmful gases inside the goaf 24 and the remaining nitrogen are released through the main drilling pipe 8, the gas return branch pipe 19, the wind collecting device 2 and the extraction branch pipe 10, forming a gas flow cycle, thereby achieving the purpose of coordinated fire extinguishing by extraction and injection.

[0048] Regarding the specific structure of the present invention, it should be noted that the connection relationship between the various component modules adopted in the present invention is definite and feasible. Except for those specifically described in the embodiments, the specific connection relationship can bring about corresponding technical effects and solve the technical problems raised by the present invention without relying on the execution of corresponding software programs. The components, modules, models of specific components appearing in the present invention, the connection methods between each other, and the conventional usage methods and expected technical effects brought about by the above-mentioned technical features, except for those specifically described, all belong to the disclosed contents in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by technical personnel in this field before the application date, or belong to the existing technologies such as conventional technology and common knowledge in this field. There is no need to elaborate, so that the technical solution provided in this case is clear, complete, and feasible, and the corresponding physical products can be reproduced or obtained based on this technical means.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf areas, characterized in that: It comprises a first gas injection main pipe (3) and a plurality of air collecting devices (2), wherein the first gas injection main pipe (3) is connected to the gas injection equipment (1), the air collecting devices (2) are placed in the first gas injection main pipe (3), and the air collecting devices (2) and the first gas injection main pipe (3) are clearance-matched; An air flow channel (14) is provided through the air collection device (2), the air collection air inlet (11) of the air flow channel (14) is communicated with the first gas injection main pipe (3), the air collection air outlet (18) of the air flow channel (14) is connected to the extraction branch pipe (10), the low pressure part (13) of the air flow channel (14) is connected to one end of the main drilling pipe (8) through the gas return pipe (15), the gas return pipe (15) and the air flow channel (14) are communicated with each other, the other end of the main drilling pipe (8) is connected to the second gas injection main pipe (21), and a pressure pump (4) is provided between the second gas injection main pipe (21) and the first gas injection main pipe (3); The main borehole pipe (8) is provided with a plurality of drainage holes (9); The main borehole pipe (8) is placed in the goaf (24).

2. The positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf according to claim 1 is characterized in that: The main drilling pipe (8) and the second gas injection main pipe (21) are connected to each other via a gas injection branch pipe (6); a sealing cover (7) is provided between the gas injection branch pipe (6) and the main drilling pipe (8); and a valve (5) is provided between the gas injection branch pipe (6) and the second gas injection main pipe (21).

3. The positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf according to claim 1 is characterized in that: The gas return pipe (15) is connected to the air flow channel (14) at a point where it is rotatably connected to an exhaust fan (17).

4. The positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf according to claim 1 is characterized in that: The cross-sectional areas of the air collecting inlet portion (11) and the air collecting outlet portion (18) on the air flow channel (14) are both larger than the cross-sectional area of the low-pressure portion (13).

5. The positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf according to claim 1 is characterized in that: A plurality of drainage components are provided in the main borehole pipe (8), and the drainage components cooperate with the drainage holes (9) to deliver the gas flowing into the main borehole pipe (8) into the goaf (24).

6. The positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf according to claim 1 is characterized in that: A gas return branch pipe (19) is provided on the main drilling pipe (8), and the gas return branch pipe (19) is connected to the gas return pipe (15).

7. The positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf according to claim 1 is characterized in that: The first gas injection main pipe (3) and the air flow channel (14) are parallel to each other.

8. The positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf according to claim 1 is characterized in that: The air collecting devices (2) correspond to the main borehole pipes (8) one by one, and the plurality of main borehole pipes (8) are parallel to each other.

9. The positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf according to claim 1 is characterized in that: The first gas injection main pipe (3), the pressure pump (4), the second gas injection main pipe (21) and the main drilling pipe (8) form an air flow loop, forming a triangular structure.

10. A positive and negative pressure injection method for rapid fire prevention and extinguishing in goaf areas, characterized by: The goaf (24) is extinguished by using the positive and negative pressure inerting system for rapid fire prevention and extinguishing in goaf as described in any one of claims 1 to 9.

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