Three-dimensional pipe network system integrating filling body drainage and carbon sequestration functions and control method

Abstract

The invention relates to a three-dimensional pipe network system integrating filling body drainage and carbon sequestration functions and a control method, the system comprises a pipe network unit, the pipe network unit comprises a water filter pipe and a water drainage pipe which are arranged in a goaf, the water filter pipe and the water drainage pipe are connected to form a three-dimensional drainage network, and the water drainage pipe is used for receiving filling bleeding water collected by the water filter pipe and discharging the filling bleeding water; a flow sensor and a first valve are arranged on a tail section pipe body of the drainage pipe connected with an external drainage system; the inflation unit is communicated with the tail pipe body of the drainage pipe and used for injecting carbon dioxide into the filling body through the pipe network unit, and the inflation unit comprises an air pressure sensor and a second valve; and the control unit is electrically connected with the flow sensor, the first valve, the air pressure sensor and the second valve. Efficient drainage consolidation is achieved through a three-dimensional pipe network, and accurate management is achieved through a sensor and automatic control; the drainage pipe network is reused as a carbon injection channel, in-situ carbon sequestration is achieved by means of the filling body, the environmental protection benefit is expanded to active carbon sequestration, and low-carbon development of mines is assisted.

Description

Technical Field

[0001] This invention relates to the field of mine goaf backfilling technology, and in particular to a three-dimensional pipeline system and control method that integrates drainage and carbon sequestration functions of the backfill body. Background Technology

[0002] While underground mining of mineral resources yields valuable resources, it also faces multiple challenges, including goaf management, tailings disposal, and environmental protection. Backfilling mining, as a green mining technology, uses tailings and other solid waste generated from mineral processing to prepare backfill slurry and refill it into the goaf. This effectively controls ground pressure, prevents surface subsidence, and achieves resource utilization of large quantities of solid waste. It possesses significant environmental and safety advantages of "treating hazards with waste and returning solid waste to the mine," and has become a mainstream technology widely adopted in non-coal underground mines both domestically and internationally.

[0003] During the backfilling process, the slurry often contains a high proportion of water to meet pipeline transportation requirements. When the backfill solidifies in the goaf, a large amount of free water (bleed water) is released. If this bleed water cannot be drained in time, it will accumulate in the enclosed space, creating extremely high hydrostatic pressure, threatening the backfill retaining wall and surrounding rock, and affecting stope stability. Simultaneously, excessively high water content will slow down the cement hydration process, weaken the early strength of the backfill, and thus slow down the cycle of mining and backfilling operations. Therefore, efficient and reliable dewatering technology is a key factor in ensuring the safety and economy of backfilling mining.

[0004] To address this need, existing technologies have developed various dewatering solutions for filled stopes, such as using permeable filled retaining walls for drainage, laying a combined filtration and drainage system at the bottom of the stope consisting of drainage boards, support mesh, and geotextiles, or using overflow drainage through drainage holes during construction. These technologies all aim to improve the drainage path of oozing water through physical structures.

[0005] However, the aforementioned existing technical solutions generally have significant limitations and drawbacks. First, their dewatering processes mostly rely on gravity flow or natural infiltration, lacking real-time monitoring and automatic control of key parameters such as drainage flow rate and pressure. This constitutes a "rough" drainage method, failing to provide accurate data feedback for optimizing the backfill slurry ratio and judging the solidification state of the backfill. Second, dewatering efficiency is greatly affected by the location and method of installation, easily leading to uneven drainage and inconsistent strength development of the backfill, posing safety hazards. Furthermore, some solutions have inadequate control of the drainage outlets, easily causing wastewater carrying fine particles to overflow and pollute the working environment of the tunnels. Most importantly, with the deepening of China's "dual-carbon" strategic goals, the mining industry not only needs to solve traditional safety and environmental protection issues but has also been given a new era mission of proactively carrying out carbon emission reduction and sequestration. The backfill is rich in pores, fissures, and alkaline components such as cement, making it a geological body with enormous potential for in-situ carbon dioxide sequestration. However, existing dewatering technologies are designed and functioned purely to serve the single goal of "drainage," and have failed to connect with the emerging major demand of "carbon sequestration" at the conceptual level. Their single function cannot meet the comprehensive requirements of green mining and low-carbon development. Summary of the Invention

[0006] To address the technical problems of inefficient drainage control and lack of carbon sequestration capabilities in existing technologies, this invention provides a three-dimensional pipe network system and control method that integrates drainage and carbon sequestration functions of the filling body. The technical solution is as follows:

[0007] On one hand, a three-dimensional pipe network system integrating drainage and carbon sequestration functions for filling bodies is provided. The system includes: a pipe network unit, which includes a filter pipe and a drain pipe located in the goaf area. The filter pipe and the drain pipe are connected to form a three-dimensional drainage network. The drain pipe is used to receive and discharge the filling body secretion collected by the filter pipe. A flow sensor and a first valve are installed on the end section of the drain pipe connected to an external drainage system; an inflation unit, connected to the end section of the drain pipe, is used to inject carbon dioxide into the filling body through the pipe network unit. The inflation unit includes a pressure sensor and a second valve; and a control unit, electrically connected to the flow sensor, the first valve, the pressure sensor, and the second valve, configured to: control the opening and closing of the first valve based on data collected by the flow sensor; and control the opening and closing of the second valve based on data collected by the pressure sensor, so as to control the carbon dioxide injection process.

[0008] On the other hand, a control method is provided for the above-mentioned integrated three-dimensional pipeline system with infill drainage and carbon sequestration functions. The control method includes: opening the first valve through the control unit to start drainage and monitoring the drainage volume based on the data from the flow sensor; determining that drainage is completed when the drainage volume meets a first preset condition and controlling the closing of the first valve; opening the second valve through the control unit to inject carbon dioxide into the pipeline unit and monitoring the pressure inside the pipe based on the data from the pressure sensor; and controlling the closing of the second valve when the pressure inside the pipe meets a second preset condition to complete carbon sequestration.

[0009] The beneficial effects of the technical solution provided by the embodiments of the present invention include at least the following: the three-dimensional pipe network system integrates drainage and carbon sequestration into one, realizing structural reuse and functional synergy; its three-dimensional drainage network can efficiently collect and discharge filling leakage water, accelerating the consolidation of the filling body; at the same time, the system introduces flow and pressure sensors, and combined with the control unit, realizes automated closed-loop control of the drainage and carbon injection processes, significantly improving the accuracy and intelligence level of process control; more importantly, the system innovatively uses the pipe network that completes the drainage task as a channel for carbon dioxide injection and distribution, and uses the filling body itself as a storage reaction site, realizing in-situ carbon sequestration in the goaf of the mine without adding new special facilities, expanding the environmental benefits of traditional filling processes from solid waste disposal to active carbon sequestration, and providing a practical and feasible technical path for the mining industry to implement the "dual carbon" goal. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0011] Figure 1 This is a schematic diagram of a three-dimensional pipe network system integrating drainage and carbon sequestration functions of the filling body, provided by an embodiment of the present invention;

[0012] Figure 2 This is a flowchart of a control method provided in an embodiment of the present invention;

[0013] Figure 3 This is a schematic diagram of a carbonization reaction provided in an embodiment of the present invention;

[0014] Figure 4 This is a schematic diagram of carbon dioxide fissure sealing and adsorption sealing provided in an embodiment of the present invention.

[0015] Explanation of reference numerals in the attached drawings: 101, water filter pipe; 102, drain pipe; 103, flow sensor; 104, first valve; 105, second pressure sensor; 106, second valve; 107, air tank; 108, filling pipeline; 109, pressure regulating valve; 110, control unit. Detailed Implementation

[0016] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0017] In embodiments of the present invention, words such as "exemplarily," "for example," etc., are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one.

[0018] In the embodiments of this invention, the terms "image" and "picture" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning. Similarly, the terms "of," "corresponding (relevant)," and "corresponding" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning.

[0019] In this embodiment of the invention, sometimes a subscript such as W1 may be written in a non-subscript form such as W1. When the difference is not emphasized, the meaning they express is the same.

[0020] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0021] Please see Figure 1This invention provides a three-dimensional pipe network system integrating drainage and carbon sequestration functions for filling bodies. The system includes a pipe network unit, an inflation unit, and a control unit 110. The pipe network unit includes a filter pipe 101 and a drain pipe 102 located within the goaf area. The filter pipe 101 and drain pipe 102 are connected to form a three-dimensional drainage network. The drain pipe 102 receives and discharges the filling body drainage water collected by the filter pipe 101. A flow sensor 103 and a first valve 104 are installed on the terminal section of the drain pipe 102 connected to an external drainage system. The inflation unit is connected to the terminal section of the drain pipe 102 and is used to inject carbon dioxide into the filling body through the pipe network unit. The inflation unit includes a pressure sensor and a second valve 106. The control unit 110 is electrically connected to the flow sensor 103, the first valve 104, the pressure sensor, and the second valve 106. It is configured to: control the opening and closing of the first valve 104 based on data collected by the flow sensor 103; and control the opening and closing of the second valve 106 based on data collected by the pressure sensor, thereby controlling the carbon dioxide injection process.

[0022] The aforementioned filter pipe 101 and drain pipe 102 are generally straight pipes, connected as a whole by various pipe fittings (two-way fittings, right-angle tee fittings, Y-type tee fittings, etc.). The diameter, length, and number of filter pipes 101 and drain pipes 102, as well as the type and number of pipe fittings, can be determined as needed based on the structural parameters of the mining area.

[0023] The aforementioned three-dimensional drainage network can be understood as a frame structure composed of filter pipe 101, drain pipe 102, and various pipe joints, which is a three-dimensional structure.

[0024] The aforementioned external drainage system can be an underground sewage discharge system. A section of the drain pipe 102 is connected to this external drainage system to discharge the collected filling effluent into the external drainage system. The flow sensor 103, the first valve 104, and the air filling unit are all installed on this section of the pipe.

[0025] The control unit 110 mentioned above can be a programmable logic controller (PLC), a distributed control system (DCS), an embedded microcontroller (such as the STM32 series), or an industrial computer (industrial control computer), etc. In a specific embodiment of the present invention, a PLC is used as the control unit 110.

[0026] The reason for injecting carbon dioxide after drainage is that alkaline substances in the backfill (such as cement hydration products and Ca2+ and Mg2+ ions abundant in tailings) can react with CO2 to form stable carbonate solids, achieving permanent carbon sequestration. The chemical carbon fixation reaction mechanism and schematic diagram of the backfill are shown below. Figure 3 and Figure 4 As shown.

[0027] This system innovatively integrates the drainage network 102 with the carbon sequestration facility. The three-dimensional drainage network ensures that filling leakage water can be collected and discharged quickly and evenly, while the integrated sensors and valves provide the hardware foundation for automated control. The control unit 110 acts as the "brain," precisely coordinating the drainage and gas injection processes based on real-time data. This integrated design avoids the complexity and cost of constructing a separate carbon sequestration facility, makes full use of existing downhole space and process steps, and achieves the dual goals of "drainage consolidation" and "carbon sequestration and emission reduction." It features a compact structure and synergistic functions.

[0028] It should be noted that the pipe network unit in this invention serves two purposes. First, it acts as a drainage channel to achieve drainage. Second, the internal space of the pipe network unit, together with the pores in the filling body and the cavities formed by water separation, forms a space for sealing carbon dioxide. Furthermore, alkaline substances in the filling body (such as cement hydration products and Ca2+ and Mg2+ ions rich in tailings) can react with CO2 to generate stable carbonate solids, achieving permanent sealing.

[0029] Optionally, the drainage pipe 102 is installed at the bottom of the goaf; the filter pipe 101 includes multiple vertically spaced vertical pipes within the goaf, and multiple horizontal pipes connecting adjacent vertical pipes. The vertical pipes are connected to the drainage pipe 102, and at least some of the horizontal pipes extend at an angle to the horizontal plane. This structure constitutes a true "three-dimensional" pipe network framework. The bottom drainage pipe 102 serves as the main confluence, the vertical pipes provide vertical coverage, and the inclined horizontal pipes enhance horizontal connectivity and flow guidance. This design not only significantly increases the contact area between the pipe network and the filling material, ensuring homogeneous drainage throughout the entire area, but the resulting grid space is also highly conducive to the subsequent diffusion and distribution of carbon dioxide gas, providing excellent conditions for physical sequestration and chemical reactions.

[0030] Understandably, for the above structure, during construction, the bottom drainage pipe 102 is laid first, followed by the filter pipe 101. When laying the filter pipe 101, on the one hand, the horizontal pipes are arranged inclined along the direction of the goaf to facilitate drainage; on the other hand, the filter pipe 101 is formed into a layered structure to cover the vertical direction of the goaf, achieving homogeneous drainage across the entire cross-section, thereby improving drainage efficiency, accelerating the solidification of the filling material, and increasing the early strength of the filling material.

[0031] Optionally, the filter pipe 101 has filter holes on its wall; the outer surface of the filter pipe 101 is covered with a filter layer, which is geotextile or non-woven fabric. Both the drain pipe 102 and the filter pipe 101 can be made of polyethylene (PE) pipe or metal pipe, the difference being that the filter pipe 101 needs to have filter holes and be covered with a filter layer. The combination of filter holes and filter layer is key to ensuring long-term effective drainage. The filter holes provide an inlet for water, while the geotextile or non-woven fabric filter layer effectively blocks fine particles in the filling slurry, preventing them from entering the pipe and causing blockages, thus ensuring the drainage channel remains unobstructed for a long time.

[0032] Optionally, the inflation unit also includes a gas storage tank 107, an injection pipeline 108, and a pressure regulating valve 109. The gas storage tank 107 stores carbon dioxide; the injection pipeline 108 connects the gas storage tank 107 and the end section of the drain pipe 102, with a second valve 106 installed on the injection pipeline 108; the pressure regulating valve 109 is installed on the injection pipeline 108 between the gas storage tank 107 and the second valve 106. The gas storage tank 107, pressure regulating valve 109, and injection pipeline 108 constitute a reliable gas supply unit. The pressure regulating valve 109 can stably reduce the high-pressure carbon dioxide in the gas storage tank 107 to the safe operating pressure required by the system, protecting downstream pipelines and sensors. The injection pipeline 108 acts as a connecting bridge, seamlessly connecting the gas source to the drain pipe 102 network. This unit design ensures that carbon dioxide can be injected into the pipeline network at a controllable pressure and flow rate, which is a prerequisite for achieving safe and efficient carbon sequestration.

[0033] Understandably, if there is a separate carbon dioxide gas source installed downhole, there is no need to install a gas storage tank 107; the injection pipeline 108 can be directly connected to the existing gas source.

[0034] Optionally, the pressure sensors include a first pressure sensor (not shown in the figure) and a second pressure sensor 105. The first pressure sensor is installed on the gas storage tank 107 or on the filling pipeline 108 between the gas storage tank 107 and the second valve 106, and is used to monitor the gas pressure inside the gas storage tank 107. The second pressure sensor 105 is installed on the filling pipeline 108 between the second valve 106 and the end section of the drain pipe 102, and is used to monitor the gas pressure within the injection network unit. The arrangement of the dual pressure sensors enables full-chain pressure monitoring of the carbon sequestration process. The first pressure sensor monitors the source pressure, which can provide real-time information on the carbon dioxide inventory and a basis for replenishment early warning. The second pressure sensor 105 monitors the actual injection pressure of the pipeline network, which is the direct basis for the control unit 110 to determine the sequestration progress and execute the cyclic gas injection logic. The combination of the two sensors enables the system to not only control the "injection" action but also sense the "sequestration" status, realizing closed-loop management from the gas source to the sequestrated body.

[0035] Optionally, both the first valve 104 and the second valve 106 are normally closed solenoid valves. Using normally closed solenoid valves ensures the inherent safety of the system. After drainage and carbon dioxide injection are completed, even after removing the control unit 110, some parts of the inflation unit (only the second valve 106 and the second pressure sensor 105 are retained, the rest can be removed), and some parts of the piping unit (such as the flow sensor 103, but...)... Figure 1 In the structure (it needs to be placed on the left side of the first valve 104 before it can be removed), after the two normally closed solenoid valves are de-energized or removed from the control system, the valves automatically close, which can permanently cut off the pipeline network, prevent accidental carbon dioxide leakage, and ensure the long-term effectiveness of the seal and downhole safety. These dismantled components can be reused later, reducing costs.

[0036] Please see Figure 2 , Figure 2 This is a flowchart illustrating a control method according to an exemplary embodiment. The control method includes: S201, opening a first valve 104 through a control unit 110 to start drainage, and monitoring the drainage volume based on data from a flow sensor 103; S202, determining that drainage has ended when the drainage volume meets a first preset condition, and controlling the closing of the first valve 104; S203, opening a second valve 106 through the control unit 110 to inject carbon dioxide into the pipeline unit, and monitoring the pressure inside the pipe based on data from a pressure sensor; S204, controlling the closing of the second valve 106 when the pressure inside the pipe meets a second preset condition, completing carbon sequestration.

[0037] This control method defines a standardized process for the automatic connection between the drainage and carbon sequestration stages. The drainage stage uses flow rate data as the core criterion to ensure sufficient dehydration of the filling material; the carbon sequestration stage uses pressure data as the core criterion to ensure effective carbon dioxide filling. The control unit 110 automatically switches stages and controls valve actions according to preset conditions, achieving fully unattended operation. This method not only improves operational efficiency but also ensures the controllability and traceability of drainage effectiveness and sequestration quality through data-driven decision-making.

[0038] Optionally, the first preset condition mentioned in step S202 can be: the drainage volume remains below the set water volume for a first preset duration. In this step, the set water volume can be, for example, 0.001 m³. 3 / h~0.005m 3 / h, the first preset duration can be, for example, 4h~12h. This specific value can be set as needed, and the above range is for reference only. Using "low flow duration" as the criterion for ending drainage is scientific and reasonable. It avoids misjudgment caused by instantaneous flow fluctuations and ensures that the system automatically switches to the next stage only when the bleeding has basically stopped and the filling body has stabilized, thus ensuring thorough drainage.

[0039] Optionally, the second preset condition mentioned in step S204 can be: the pressure inside the pipe remains higher than the set pressure for a second preset duration. In this step, the set pressure can be, for example, 1.5 to 3 atmospheres, and the second preset duration can be, for example, 1 hour to 5 hours. Using the "pressure stabilization duration" as the criterion for completion of sealing can effectively distinguish between "pressure reached" and "sealage stabilization". A brief pressure drop may be absorbed, while continuous pressure stabilization indicates that the sealing space is approaching saturation and the reaction or adsorption has reached dynamic equilibrium. At this point, terminating the injection can avoid energy waste.

[0040] Optionally, when the pressure inside the pipe meets the second preset condition, the following steps are taken: (1) when the pressure inside the pipe reaches the preset upper limit pressure, the second valve 106 is closed and the pressure inside the pipe is monitored; (2) when the injection pressure drops to the preset lower limit pressure, the second valve 106 is opened and the pressure inside the pipe is monitored; (3) the above process is repeated until the pressure inside the pipe reaches the preset upper limit pressure for the Nth time, at which point the second preset condition is determined to be met, where N is the preset number of times. The preset upper limit pressure can be, for example, 2 atmospheres, the preset lower limit pressure can be, for example, 0.8 atmospheres, and N can be, for example, 2 to 4 times. The cyclic pressure control strategy is an optimized scheme designed for carbon dioxide that may be continuously absorbed or adsorbed by the filling material. Through the cycle of "pressurization-closure-monitoring-pressure replenishment", the system can actively respond to the pressure decay during the sealing process. Multiple cycles ensure that carbon dioxide can fully penetrate the pores of the filling material and participate in as many mineralization reactions as possible, thereby significantly improving the sealing rate and sealing strength, which is an advanced control mode that pursues the best sealing effect.

[0041] Two second-preset condition schemes offer different control strategies. Scheme 1 (pressure stabilization time) is a relatively simple and efficient criterion, suitable for scenarios where general control of storage time or gas consumption is required. Scheme 2 (cyclic pressure control) is a more proactive and thorough criterion, ensuring adequacy of the carbon sequestration through multiple proactive pressurization cycles, suitable for scenarios with higher requirements for carbon sequestration rates or significant absorption characteristics of the packing material. The two schemes complement each other and can be flexibly selected or configured according to actual engineering needs and conditions.

[0042] The scope of application of this invention includes, but is not limited to, paste filling, high-concentration filling, and low-concentration filling. Compared with the prior art, this invention has the following beneficial effects: (1) By arranging the pipe network unit in a homogeneous manner across the entire cross section, the overflow water above the filling body and the internal free water are discharged quickly, homogeneously, and uniformly, reducing the water-cement ratio, promoting the gelation and solidification of the filling body and improving its strength. Homogenized drainage can also avoid the problem of uneven strength distribution of the filling body, which not only improves the stability of filling and mining, but also effectively shortens the mining and filling cycle and improves the recovery efficiency. (2) It improves the automated monitoring, measurement and control of the drainage process in the filling stope. Through the PLC automatic control and data acquisition system, it realizes the precise control and accurate measurement of the drainage process, providing a reliable basis for estimating the shrinkage rate of the filling body, optimizing the filling process and controlling the process. (3) Introducing the discharged water into the mine drainage system not only avoids the problem of underground environmental pollution, but also enhances the recovery and utilization of water resources. (4) Make full use of the internal space of the drainage pipe network 102 and the carbon dioxide sequestration geological body formed by the filling body, and deeply integrate the filling process with carbon sequestration to improve environmental protection benefits.

[0043] The above embodiments can be implemented, in whole or in part, by software, hardware (such as circuits), firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0044] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0045] In this invention, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be a single item or multiple items.

[0046] It should be understood that, in various embodiments of the present invention, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0047] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0048] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0049] In the several embodiments provided by this invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0050] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0051] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0052] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A three-dimensional pipe network system integrating drainage and carbon sequestration functions of the filling body, characterized in that, The system includes: The pipeline unit includes a filter pipe and a drainage pipe located in the goaf area. The filter pipe and the drainage pipe are connected to form a three-dimensional drainage network. The drainage pipe is used to receive the filling leakage collected by the filter pipe and discharge it. A flow sensor and a first valve are installed on the end section of the drainage pipe that connects to the external drainage system. An inflation unit, connected to the end section of the drain pipe, is used to inject carbon dioxide into the filling body through the pipe network unit. The inflation unit includes a pressure sensor and a second valve; and The control unit, electrically connected to the flow sensor, the first valve, the pressure sensor, and the second valve, is configured to: The opening and closing of the first valve is controlled based on the data collected by the flow sensor; The opening and closing of the second valve is controlled based on the data collected by the pressure sensor to control the carbon dioxide injection process.

2. The three-dimensional pipe network system integrating drainage and carbon sequestration functions of the filling body according to claim 1, characterized in that, The drainage pipe is installed at the bottom of the goaf area; The filter pipe includes multiple vertical pipes arranged at intervals within the goaf area, and multiple horizontal pipes connected between adjacent vertical pipes. The vertical pipes are connected to the drainage pipe, and at least some of the horizontal pipes have an angle between their extension direction and the horizontal plane.

3. The three-dimensional pipe network system integrating drainage and carbon sequestration functions of the filling body according to claim 1, characterized in that, The filter pipe has filter holes on its wall; the outer surface of the filter pipe is covered with a filter layer, which is geotextile or non-woven fabric.

4. The three-dimensional pipe network system integrating drainage and carbon sequestration functions of the filling body according to claim 1, characterized in that, The inflation unit also includes: Gas storage tanks are used to store carbon dioxide; A filling pipeline, connecting the gas storage tank and the end section of the drain pipe, wherein the second valve is installed on the filling pipeline; and A pressure regulating valve is installed on the filling pipeline between the gas storage tank and the second valve.

5. The three-dimensional pipe network system integrating drainage and carbon sequestration functions of the filling body according to claim 4, characterized in that, The pressure sensor includes: A first pressure sensor is installed on the gas storage tank or on the filling pipeline between the gas storage tank and the second valve, for monitoring the gas pressure inside the gas storage tank; The second pressure sensor is installed on the filling pipeline between the second valve and the end section of the drain pipe, and is used to monitor the gas pressure injected into the pipeline unit.

6. The three-dimensional pipe network system integrating drainage and carbon sequestration functions of the filling body according to claim 4, characterized in that, Both the first valve and the second valve are normally closed solenoid valves.

7. A control method applied to a three-dimensional pipe network system integrating drainage and carbon sequestration functions of the filling body as described in any one of claims 1 to 6, characterized in that, The control method includes: The control unit opens the first valve to start drainage and monitors the drainage volume based on the data from the flow sensor. When the drainage volume meets the first preset condition, it is determined that the drainage has ended, and the first valve is closed. The control unit opens the second valve to inject carbon dioxide into the pipeline unit and monitors the pressure inside the pipeline based on data from the pressure sensor. When the pressure inside the pipe meets the second preset condition, the second valve is closed to complete carbon sequestration.

8. The control method as described in claim 7, characterized in that, The first preset condition is: the drainage volume is continuously lower than the set water volume for a first preset time.

9. The control method as described in claim 7, characterized in that, The second preset condition is: the pressure inside the pipe is continuously higher than the set pressure for a second preset duration.

10. The control method as described in claim 7, characterized in that, When the pressure inside the pipe meets the second preset condition, including: When the pressure inside the pipe reaches the preset upper limit pressure, the second valve is closed and the pressure inside the pipe continues to be monitored. When the injection pressure drops to a preset lower limit pressure, the second valve is opened and the pressure inside the pipe continues to be monitored; Repeat the above process until the pressure inside the pipe reaches the preset upper limit pressure for the Nth time, at which point it is determined that the second preset condition is met, where N is the preset number of times.

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