Goaf carbon dioxide fire prevention and extinguishing method and device, storage medium and processor

Abstract

The application provides a goaf carbon dioxide fire prevention and extinguishing method, device, storage medium and processor. The method adopts air lane and machine lane pipe embedding and simultaneously injects carbon dioxide for fire prevention and extinguishing. The carbon dioxide is obtained by vaporization of liquid carbon dioxide. The method comprises the following steps: detecting the carbon dioxide concentration of the upper corner; and generating a carbon dioxide injection strategy set based on the carbon dioxide concentration of the upper corner, which is used for controlling the injection amount of carbon dioxide. The technical scheme of the application ensures that the pressure at the upper and lower ends of the working face is always kept in a relatively stable state, effectively reduces the air leakage of the goaf, improves the safety of mine operation, and solves the problem of insufficient safety of the fire prevention and extinguishing method in the prior art.

Description

Technical Field

[0001] This invention relates to the field of coal mine fire prevention and extinguishing technology, and more specifically, to a carbon dioxide fire prevention and extinguishing method, device, storage medium, and processor for goaf areas. Background Technology

[0002] Spontaneous combustion in goafs is one of the major hazards in coal mines. The resulting working face closure accidents caused by spontaneous combustion lead to enormous direct and indirect losses, including production stoppages and fire zone control. With increasing coal mining depth, the prevention and control of spontaneous combustion in coal seams becomes a major challenge for most mines due to the combined effects of ventilation processes, geothermal hazards, and mine pressure. This is especially true for mines mining easily ignitable coal seams. Traditional fire prevention techniques such as grouting, nitrogen injection, and leak sealing are no longer sufficient to guarantee safe mining operations, and spontaneous combustion has become a significant technical obstacle to safe production in mines.

[0003] Carbon dioxide fire suppression technology, as a mature technology, has been widely used in coal mine fire control, and currently there are two main methods. One is similar to the traditional nitrogen injection process in goaf areas, utilizing the inerting and asphyxiating properties of carbon dioxide to induce spontaneous combustion in the goaf. This is typically achieved by using buried pipes in the intake roadway, allowing the injected inert gas to be dispersed within the goaf through air leakage, thus reducing oxygen levels and preventing fire extinguishing. The other method is direct injection of liquid carbon dioxide, which involves injecting liquid carbon dioxide directly into the underground goaf area via carbon dioxide tank trucks or surface boreholes for fire suppression. The inert gas injection method typically requires an injection rate of 1200 m³ / h, requiring continuous 24-hour injection. This large injection volume can introduce oxygen, potentially leading to reignition during actual fire suppression. The direct injection of liquid carbon dioxide poses operational safety risks, such as low-temperature leakage and excessive instantaneous vaporization during injection. Furthermore, spontaneous combustion in goaf areas is highly concealed, with the location of the fire source being unclear and difficult to pinpoint. Therefore, conventional effective measures such as grouting and water injection cannot accurately solve the regional fire prevention and extinguishing problems in goaf areas. Summary of the Invention

[0004] The main objective of this invention is to provide a carbon dioxide fire prevention and extinguishing method, device, storage medium, and processor for goaf areas, in order to solve the problem that the safety of existing fire prevention and extinguishing methods is not high enough.

[0005] To achieve the above objectives, according to one aspect of the present invention, a method for preventing and extinguishing fires with carbon dioxide in goaf areas is provided. The method employs simultaneous injection of carbon dioxide into ventilation roadways and machine roadways via buried pipes. The carbon dioxide is derived from the vaporization of liquid carbon dioxide. The method includes the following steps: detecting the carbon dioxide concentration at the upper corner; and generating a set of carbon dioxide injection strategies based on the carbon dioxide concentration at the upper corner, wherein the set of carbon dioxide injection strategies is used to control the injection amount of carbon dioxide.

[0006] Optionally, the depth of the ventilation tunnel can be 30m to 50m.

[0007] Optionally, the depth of the buried pipe in the machine tunnel is 30m to 50m.

[0008] Optionally, the carbon dioxide fire prevention and extinguishing method for the goaf includes: determining the safe critical value for injecting carbon dioxide before detecting the carbon dioxide concentration in the upper corner. The safe critical value includes: the critical value of the oxygen concentration in the oxidation zone of the goaf, the critical value of the oxygen concentration in the return airflow of the working face, and the critical value of the carbon dioxide concentration in the upper corner.

[0009] Optionally, the carbon dioxide fire prevention and extinguishing method for goaf areas further includes: determining whether the carbon dioxide concentration in the upper corner is lower than a first preset value, wherein the first preset value is less than the critical value of the carbon dioxide concentration in the upper corner in the safety critical value; if so, generating a first carbon dioxide injection strategy based on the carbon dioxide concentration in the upper corner, the first carbon dioxide injection strategy including simultaneously injecting carbon dioxide using ventilation roadway pipelines and machine roadway pipelines, and controlling the amount of carbon dioxide injected to not exceed the safety critical value.

[0010] Optionally, the carbon dioxide fire prevention and extinguishing method for goaf areas further includes: determining whether the carbon dioxide concentration in the upper corner reaches a second preset value, wherein the second preset value is greater than a first preset value and less than a critical value for the carbon dioxide concentration in the upper corner; if so, generating a second carbon dioxide injection strategy based on the carbon dioxide concentration in the upper corner, the second carbon dioxide injection strategy including stopping the injection of carbon dioxide using the machine roadway pipeline, injecting carbon dioxide using the ventilation roadway pipeline, and controlling the injection amount of carbon dioxide to not exceed the safety critical value.

[0011] Optionally, the carbon dioxide fire prevention and extinguishing method for goaf areas further includes: determining whether the carbon dioxide concentration in the upper corner has reached a critical value; if so, generating a stop injection strategy based on the carbon dioxide concentration in the upper corner, and using a second carbon dioxide injection strategy to stop the injection of carbon dioxide.

[0012] According to another aspect of the present invention, a carbon dioxide fire prevention and extinguishing device for goaf areas is provided, comprising: a detection module for detecting the carbon dioxide concentration in the upper corner; and a control module for generating a set of carbon dioxide injection strategies based on the carbon dioxide concentration in the upper corner, the set of carbon dioxide injection strategies being used to control the amount of carbon dioxide injected.

[0013] According to another aspect of the present invention, a computer-readable storage medium is provided, comprising a stored program, wherein the program, when executed, performs the aforementioned carbon dioxide fire prevention and extinguishing method for goaf areas.

[0014] According to another aspect of the present invention, a processor is provided for running a program, wherein the program executes the above-described method for preventing and extinguishing carbon dioxide fires in goaf areas.

[0015] Applying the technical solution of this invention, the carbon dioxide fire prevention and extinguishing method for goaf areas employs simultaneous carbon dioxide injection through buried pipes in ventilation roadways and machine roadways. The carbon dioxide is generated through the vaporization of liquid carbon dioxide. By detecting the carbon dioxide concentration at the upper corner, a set of carbon dioxide injection strategies is generated based on the carbon dioxide concentration at the upper corner. This set of carbon dioxide injection strategies is used to control the amount of carbon dioxide injected, ensuring that the pressure at both ends of the working face remains relatively stable. This effectively reduces air leakage in the goaf area, improves the safety of mine operations, and solves the problem of insufficient safety in existing fire prevention and extinguishing methods. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic flowchart of the carbon dioxide fire prevention and extinguishing method for goaf areas according to the present invention is shown;

[0018] Figure 2 A schematic diagram of the process flow of an embodiment of the present invention, which employs simultaneous carbon dioxide injection through buried pipes in ventilation tunnels and machine tunnels, is shown.

[0019] Figure 3 A structural block diagram of a carbon dioxide fire prevention and extinguishing device for goaf areas according to the present invention is shown.

[0020] The above figures include the following reference numerals:

[0021] 10. Liquid carbon dioxide tanker truck; 20. Liquid carbon dioxide storage tank; 30. Buffer tank; 40. Air bath vaporizer; 50. Intake airway; 60. Return airway; 70. Goaf. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0026] According to an embodiment of the present invention, a method embodiment of a carbon dioxide fire prevention and extinguishing method for goaf areas is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0027] like Figure 1 The diagram shown is a flowchart illustrating an embodiment of the carbon dioxide fire prevention and extinguishing method for goaf areas according to this application. The method employs simultaneous injection of carbon dioxide into ventilation and machine roadways via buried pipes. The carbon dioxide is derived from the vaporization of liquid carbon dioxide. The method includes the following steps:

[0028] Step S102: Detect the carbon dioxide concentration in the upper corner;

[0029] Step S104: Based on the carbon dioxide concentration at the upper corner, generate a set of carbon dioxide infusion strategies, which are used to control the amount of carbon dioxide infused.

[0030] Applying the technical solution of this embodiment, the carbon dioxide fire prevention and extinguishing method for goaf areas employs simultaneous carbon dioxide injection through buried pipes in ventilation roadways and machine roadways. The carbon dioxide is produced through the vaporization of liquid carbon dioxide. By detecting the carbon dioxide concentration at the upper corner, a set of carbon dioxide injection strategies is generated based on this concentration. This set of strategies controls the injection volume of carbon dioxide, ensuring that the pressure at both ends of the working face remains relatively stable. This effectively reduces air leakage in the goaf area, improves the safety of mine operations, and solves the problem of insufficient safety in existing fire prevention and extinguishing methods. The optimal depth for burying pipes in ventilation roadways and machine roadways is 30m to 50m. The optimal depth values ​​for burying pipes in ventilation roadways and machine roadways were obtained through data analysis combined with the division of the three zones of the goaf area and experimental verification.

[0031] Optionally, the carbon dioxide fire prevention and extinguishing method for the goaf includes: determining the safe critical values ​​for carbon dioxide injection before detecting the carbon dioxide concentration in the upper corner. These safe critical values ​​include: the critical value for oxygen concentration in the oxidation zone of the goaf, the critical value for oxygen concentration in the return airflow of the working face, and the critical value for carbon dioxide concentration in the upper corner. In this embodiment, the critical value for oxygen concentration in the oxidation zone of the goaf is 10%, the critical value for oxygen concentration in the return airflow of the working face is 19%, and the critical value for carbon dioxide concentration in the upper corner is 1.0%. Specifically, by injecting carbon dioxide, the oxygen concentration in the oxidation zone of the goaf is ensured to be no greater than 10%, the oxygen concentration in the return airflow of the working face is no less than 19%, and the carbon dioxide concentration in the upper corner is no greater than 1.0%. This ensures the safety of workers in the goaf, preventing both oxygen deficiency and increased oxygen concentration, which would otherwise lead to poor fire prevention and extinguishing effects.

[0032] Optionally, carbon dioxide fire prevention and extinguishing methods for goaf areas also include:

[0033] Determine whether the carbon dioxide concentration at the upper corner is lower than a first preset value, wherein the first preset value is less than the critical value of the carbon dioxide concentration at the upper corner in the safety threshold.

[0034] In this step, the first preset value is set to 0.2%.

[0035] If so, based on the carbon dioxide concentration at the upper corner, a first carbon dioxide injection strategy is generated. The first carbon dioxide injection strategy includes simultaneously injecting carbon dioxide using ventilation tunnel pipelines and machine tunnel pipelines, while controlling the amount of carbon dioxide injected to not exceed the safety threshold.

[0036] In this embodiment, when the carbon dioxide concentration in the upper corner is detected to decrease to 0.2%, carbon dioxide is injected simultaneously through the ventilation roadway and machine roadway, and the amount of carbon dioxide injected is controlled to not exceed the safety threshold. That is, the amount of carbon dioxide injected is always guaranteed to ensure that the oxygen concentration in the oxidation zone of the goaf is not greater than 10%, the oxygen concentration in the return airflow of the working face is not less than 19%, and the carbon dioxide concentration in the upper corner is not greater than 1.0%, thereby further improving the safety of mine operations and the fire prevention and extinguishing effect of the goaf fire prevention and extinguishing method.

[0037] Optionally, carbon dioxide fire prevention and extinguishing methods for goaf areas also include:

[0038] Determine whether the carbon dioxide concentration in the upper corner reaches a second preset value, wherein the second preset value is greater than the first preset value and less than the critical value of the carbon dioxide concentration in the upper corner;

[0039] In this step, the second critical value is 0.7%.

[0040] If so, based on the carbon dioxide concentration at the upper corner, a second carbon dioxide injection strategy is generated. The second carbon dioxide injection strategy includes stopping the injection of carbon dioxide through the machine roadway pipeline, injecting carbon dioxide through the ventilation roadway pipeline, and controlling the injection amount of carbon dioxide to not exceed the safety threshold.

[0041] In this embodiment, when the carbon dioxide concentration in the upper corner is detected to reach 0.7%, the injection of carbon dioxide using the machine roadway pipeline is stopped, and only the ventilation roadway pipeline is used for injection. If the carbon dioxide concentration in the upper corner is high but does not exceed the safety threshold, carbon dioxide injection continues, but the amount of carbon dioxide injected is reduced, thereby further ensuring the fire prevention and extinguishing effect and the safety of mine operations.

[0042] Optionally, carbon dioxide fire prevention and extinguishing methods for goaf areas also include:

[0043] Determine whether the carbon dioxide concentration at the top corner has reached the critical value for carbon dioxide concentration at the top corner;

[0044] If so, a stop-infusion strategy is generated based on the carbon dioxide concentration at the upper corner, and a second carbon dioxide infusion strategy is used to stop the infusion of carbon dioxide.

[0045] In this embodiment, when the carbon dioxide concentration in the upper corner is detected to reach 1%, the carbon dioxide injection is stopped, thereby ensuring that the amount of carbon dioxide injected does not exceed the safety threshold and guaranteeing the safety of mine operations.

[0046] like Figure 2The diagram shows a process flow diagram of an embodiment of simultaneous carbon dioxide injection using buried pipes in ventilation and machine roadways according to this application. The process flow is as follows: tanker truck, liquid carbon dioxide storage tank, pressurization device, vaporization device, electric heating auxiliary heating device, pressure and flow stabilization device, metering device, nitrogen, carbon dioxide buffer storage tank, underground pipeline network, buried pipes in the ventilation and machine roadways of the working face, and goaf. Specifically, liquid carbon dioxide is transported by the liquid carbon dioxide tanker truck 10, and then proceeds to the next step: the liquid carbon dioxide storage tank 20 is pressurized by the pressurization device, and then the liquid carbon dioxide is vaporized by the vaporization device. In this embodiment, the vaporization device is an air bath vaporizer 40. The electric heating auxiliary heating device further promotes the vaporization of liquid carbon dioxide into carbon dioxide, and the carbon dioxide passes sequentially through the pressure and flow stabilization device, metering device, and buffer tank 30, and then through the underground pipeline network, through the intake airway 50 and return airway 60 to the ventilation and machine roadway pipelines of the working face of the goaf 70, thereby achieving fire prevention and extinguishing of the working face of the goaf. In this embodiment, buffer tank 30 is a nitrogen and carbon dioxide buffer storage tank. The technical parameters for simultaneously injecting carbon dioxide into the working face of the goaf using buried pipes in the ventilation roadway and machine roadway are shown in Table 1.

[0047] Table 1 Technical parameters for simultaneous carbon dioxide injection in ventilation and machine roadways at the working face of the goaf.

[0048] Vaporization capacity Steam outlet temperature Export pressure purity Pipe diameter Pipeline burial depth in goaf <![CDATA[2000m 3 / h]]> -15℃～5℃ 0.8Mpa 99.9％ ≥φ108mm 30m~50m

[0049] Specifically, the vaporization capacity of liquid carbon dioxide is 2000m³. 3The steam output is per hour, with an outlet temperature of -15℃ to 5℃ and an outlet pressure of 0.8 MPa. The carbon dioxide is derived from the vaporization of liquid carbon dioxide, achieving a purity of up to 99.99%. This completely avoids the problem of oxygen being introduced during inert gas injection, which could easily lead to reignition during actual firefighting. For ventilation and machine roadways in the goaf area, the pipe diameter should be greater than or equal to 108 mm, with an optimal burial depth of 30 m to 50 m. CO2 is a colorless, slightly acidic, asphyxiating gas at room temperature and pressure. Its relative molecular weight is 44.01, and its specific gravity is approximately 1.53 times that of air. CO2 is chemically inert, neither flammable nor combustion-supporting. When the CO2 concentration in the air exceeds 29.2%, it can extinguish combustion. It is a common fire extinguishing material suitable for fighting Class A fires. Simultaneous injection of carbon dioxide into the goaf via buried pipes in ventilation and machine roadways for fire prevention and extinguishing. After CO2 is injected into the goaf, it reduces the oxygen concentration, weakening a crucial condition for coal-oxygen interaction and slowing down this process. This, to some extent, inhibits the production of oxidation products such as CO, thus suppressing spontaneous combustion of coal. Furthermore, coal's ability to adsorb CO2 is far greater than that of nitrogen. Under the condition of multiple gases present underground, CO2 can be adsorbed onto the coal more extensively and rapidly, forming a protective layer and effectively inhibiting coal-oxygen interaction. Moreover, the injection of CO2 into the goaf increases gas pressure and reduces air leakage, effectively releasing and diluting the oxygen content, thus inerting the goaf. On the other hand, carbon dioxide is heavier than air and can diffuse downwards with the roadway slope, remaining in the goaf for a longer period, compensating for the shortcomings of nitrogen's rapid diffusion and short residence time. When extinguishing the spontaneous combustion of coal at the bottom, CO2 can quickly sink to the bottom and squeeze out oxygen, and diffuse into the fire zone to fill its space, causing the oxygen concentration in the fire zone to drop rapidly. This ensures the fire prevention and extinguishing effect on the entire goaf, thus effectively solving the regional fire prevention problem caused by the strong concealment of spontaneous combustion, the ambiguity of the fire source location, and the inability to accurately locate the fire source in the goaf.

[0050] According to one specific embodiment of this application, the amount of carbon dioxide injected varies under four different conditions: the intake side, the return side, the intake and return side open zone, and the equalization open zone. As long as the safety threshold is not exceeded, the more carbon dioxide injected, the better.

[0051] According to another specific embodiment of this application, a carbon dioxide fire prevention and extinguishing device for goaf areas is provided, such as... Figure 3 As shown, the carbon dioxide fire prevention and extinguishing device for the goaf includes a detection module 42 and a control module 44. The detection module 42 is used to detect the carbon dioxide concentration in the upper corner, and the control module 44 generates a set of carbon dioxide injection strategies based on the carbon dioxide concentration in the upper corner. The set of carbon dioxide injection strategies is used to control the amount of carbon dioxide injected.

[0052] In this embodiment, the carbon dioxide fire prevention and extinguishing device in the goaf detects the carbon dioxide concentration at the upper corner and generates a set of carbon dioxide injection strategies based on the carbon dioxide concentration at the upper corner. The set of carbon dioxide injection strategies is used to control the amount of carbon dioxide injected, ensuring that the pressure at both ends of the working face remains relatively stable. This effectively reduces air leakage in the goaf, improves the safety of mine operations, and solves the problem that the safety of existing fire prevention and extinguishing methods is not high enough.

[0053] According to another specific embodiment of this application, a computer-readable storage medium is provided, which includes a stored program, wherein the program executes the carbon dioxide fire prevention and extinguishing method for goaf areas described in the above embodiments when it is run.

[0054] According to another specific embodiment of this application, a processor is provided for running a program, wherein the program executes the carbon dioxide fire prevention and extinguishing method for goaf areas described in the above embodiments.

[0055] The embodiments of the carbon dioxide fire prevention and extinguishing method for goaf areas described in this application can be executed in an electronic device or similar computing device that includes a memory and a processor. Taking an electronic device as an example, the electronic device may include one or more processors 102 (processors may include, but are not limited to, central processing units (CPUs), graphics processing units (GPUs), digital signal processing (DSP) chips, microprocessors (MCUs), programmable logic devices (FPGAs), neural network processors (NPUs), tensor processors (TPUs), artificial intelligence (AI) type processors, etc.) and a memory 104 for storing data. Optionally, the above-described electronic device may also include a transmission device 106 for communication functions, an input / output device 108, and a display 110. Those skilled in the art will understand that this does not limit the structure of the above-described electronic device. For example, the electronic device may also include more or fewer components than described above, or have a different configuration than described above.

[0056] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the information processing method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the aforementioned information processing method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0057] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0058] Display 110 may be, for example, a touchscreen liquid crystal display (LCD) or a touch display (also referred to as a "touchscreen" or "touch display"). This LCD allows a user to interact with the user interface of the mobile terminal. In some embodiments, the mobile terminal has a graphical user interface (GUI), which allows the user to interact with the GUI via finger contact and / or gestures on a touch-sensitive surface. Optional human-computer interaction functions include: creating web pages, drawing, word processing, creating electronic documents, playing games, video conferencing, instant messaging, sending and receiving emails, a call interface, playing digital video, playing digital music, and / or web browsing, etc. Executable instructions for performing the above human-computer interaction functions are configured / stored in one or more processor-executable computer program products or readable storage media.

[0059] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0060] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0061] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preventing and extinguishing fires in goaf areas using carbon dioxide, characterized in that, The method employs carbon dioxide injection through buried pipes in ventilation and machine tunnels for fire prevention and extinguishing. The carbon dioxide is derived from the vaporization of liquid carbon dioxide. The method includes the following steps: Detect the carbon dioxide concentration in the upper corner; Based on the carbon dioxide concentration at the upper corner, a set of carbon dioxide infusion strategies is generated, which is used to control the amount of carbon dioxide infused. Before detecting the carbon dioxide concentration at the upper corner, a safe threshold for injecting carbon dioxide is determined. The safe threshold includes: a threshold for the oxygen concentration in the oxidation zone of the goaf, a threshold for the oxygen concentration in the return airflow of the working face, and a threshold for the carbon dioxide concentration at the upper corner. Determine whether the carbon dioxide concentration at the upper corner is lower than a first preset value, wherein the first preset value is less than the critical value of the carbon dioxide concentration at the upper corner in the safety threshold; If so, based on the carbon dioxide concentration at the upper corner, a first carbon dioxide injection strategy is generated. The first carbon dioxide injection strategy includes simultaneously injecting carbon dioxide using ventilation tunnel pipelines and machine tunnel pipelines, and controlling the injection amount of carbon dioxide to not exceed the safety threshold.

2. The carbon dioxide fire prevention and extinguishing method for goaf areas according to claim 1, characterized in that, The depth of the buried pipes in the ventilation tunnel and the machine tunnel is 30m to 50m.

3. The carbon dioxide fire prevention and extinguishing method for goaf areas according to claim 1, characterized in that, The carbon dioxide fire prevention and extinguishing method for goaf areas also includes: Determine whether the carbon dioxide concentration at the upper corner reaches a second preset value, wherein the second preset value is greater than the first preset value and less than a critical value for the carbon dioxide concentration at the upper corner; If so, based on the carbon dioxide concentration at the upper corner, a second carbon dioxide injection strategy is generated, which includes stopping the injection of carbon dioxide using the machine roadway pipeline, injecting carbon dioxide using the ventilation roadway pipeline, and controlling the injection amount of carbon dioxide to not exceed the safety threshold.

4. The carbon dioxide fire prevention and extinguishing method for goaf areas according to claim 1, characterized in that, The carbon dioxide fire prevention and extinguishing method for goaf areas also includes: Determine whether the carbon dioxide concentration at the upper corner has reached the critical value for the carbon dioxide concentration at the upper corner; If so, a stop-infusion strategy is generated based on the carbon dioxide concentration at the upper corner, wherein the second carbon dioxide infusion strategy is used to stop the infusion of carbon dioxide.

5. A carbon dioxide fire prevention and extinguishing device for goaf areas, characterized in that, The goaf carbon dioxide fire extinguishing device uses the goaf carbon dioxide fire extinguishing method according to any one of claims 1-4 for fire extinguishing, and the goaf carbon dioxide fire extinguishing device comprises: The detection module is used to detect the carbon dioxide concentration in the upper corner; The control module generates a set of carbon dioxide infusion strategies based on the carbon dioxide concentration at the upper corner, and the set of carbon dioxide infusion strategies is used to control the amount of carbon dioxide infused. Before detecting the carbon dioxide concentration at the upper corner, a safe threshold for injecting carbon dioxide is determined. The safe threshold includes: a threshold for the oxygen concentration in the oxidation zone of the goaf, a threshold for the oxygen concentration in the return airflow of the working face, and a threshold for the carbon dioxide concentration at the upper corner. Determine whether the carbon dioxide concentration at the upper corner is lower than a first preset value, wherein the first preset value is less than the critical value of the carbon dioxide concentration at the upper corner in the safety threshold; If so, based on the carbon dioxide concentration at the upper corner, a first carbon dioxide injection strategy is generated. The first carbon dioxide injection strategy includes simultaneously injecting carbon dioxide using ventilation tunnel pipelines and machine tunnel pipelines, and controlling the injection amount of carbon dioxide to not exceed the safety threshold.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein the program, when executed, performs the carbon dioxide fire prevention and extinguishing method for goaf areas as described in any one of claims 1 to 4.

7. A processor, characterized in that, The processor is used to run a program, wherein the program executes the carbon dioxide fire prevention and extinguishing method for goaf areas as described in any one of claims 1 to 4.

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