Intelligent underground coal-water separation system and control method

Abstract

The invention relates to an intelligent underground coal-water separation system and a control method, and belongs to the field of coal mine gas extraction. The system integrates a collecting unit, a grading and screening unit, a fine particle filtering and separating device, an automatic metering and transferring unit and a PLC control system. Active gas extraction is performed in the collection unit, so that gas is preliminarily separated; and the graded screening unit and the fine particle filtering and separating device are matched with the laser sensor and the liquid concentration sensor to achieve multi-stage screening of the solid coal slag, and the separation efficiency and precision are improved. By designing an integrated system of orifice collection, multi-stage screening, fine particle filtering and separating, intelligent control and automatic metering and transferring, and combining a PLC intelligent control system with multiple types of sensors, a multi-stage screening device and an automatic metering and transferring device, efficient separation, accurate control and automatic treatment of coal cinder, water and gas are achieved; the problems that a traditional separation technology is low in efficiency, insufficient in automation, poor in environment and the like are solved, and coal mine underground standard production requirements are met.

Description

Technical Field

[0001] This invention belongs to the field of coal mine gas extraction and relates to an intelligent underground coal-water separation system and control method. Background Technology

[0002] Hydraulic construction measures such as hydraulic drilling, hydraulic slotting, hydraulic perforation, and hydraulic cavity making in coal mines are hydraulic methods for coal mine gas control. However, such construction will generate a large amount of coal slag, water and gas mixture, which may cause the gas at the orifice to exceed the limit. In addition, a large amount of coal slag and water will flow to the surface, resulting in a dirty, messy and poor construction environment, which does not meet the requirements of standardized production in mines.

[0003] Currently, underground gas extraction in coal mines often employs methods such as hydraulic fracturing, hydraulic perforation, and hydraulic cavity creation to improve coal seam permeability. These measures frequently generate large amounts of coal slag, water, and gas mixtures. However, existing coal-water treatment and metering methods suffer from deficiencies such as low levels of equipment automation, low metering accuracy or lack of metering, and a lack of solid material transfer measures, making it difficult to meet the needs of evaluating the effectiveness of hydraulic measures and standardizing mine production.

[0004] Although there have been attempts to improve existing related patented technologies, some coal-water separation methods for bottom drainage roadway drilling can achieve continuous coal-water separation and reduce manual coal cleaning, but they are insufficient in terms of separation efficiency and automation, making it difficult to achieve efficient separation and automatic metering.

[0005] The specific technical problems are as follows: (1) The mixture of coal slag, water and gas generated by hydraulic construction in coal mines is difficult to separate effectively. The gas at the orifice is prone to exceed the limit. The coal slag and water flow result in a dirty, messy and poor construction environment, which does not meet the requirements of standardized production in mines. (2) Existing coal-water treatment and metering methods have low metering accuracy and outdated equipment, which cannot meet the requirements for evaluating the effectiveness of hydraulic measures; (3) Existing coal-water separation devices have low separation efficiency and insufficient automation, and cannot achieve efficient separation and automatic metering of coal-water mixtures; (4) Lacking an intelligent control system, it is impossible to automatically adjust parameters according to working conditions, making it difficult to meet the separation requirements under different construction conditions.

[0006] In summary, existing technologies suffer from problems such as low efficiency in separating mixtures and insufficient automation and intelligence, which cannot meet the needs of evaluating the effectiveness of hydraulic measures and standardizing mine production. Summary of the Invention

[0007] In view of this, the purpose of this invention is to provide an intelligent underground coal-water separation system and control method to solve the problems of separating coal slag, water and gas mixtures and environmental management during construction, and to improve gas extraction efficiency and the level of standardized production in mines.

[0008] To achieve the above objectives, the present invention provides the following technical solution: An intelligent underground coal-water separation system comprises, in sequence, a collection unit, a grading and screening unit, a fine particle filtration device, and a metering and transfer unit. The collection unit includes a water collection tank and a liquid level sensor, a methane concentration sensor, and an active gas extraction pump mounted on the tank. The grading and screening unit comprises, in sequence, a large particle solid screening device, a small particle solid screening device, and a liquid collector, as well as laser sensors mounted on the large particle solid screening device and the small particle solid screening device to monitor the amount of solid-liquid mixture and adjust screening parameters. The liquid collector's outlet pipe... The system is connected to low-concentration and high-concentration pipelines. The outlet end of the low-concentration pipeline is connected to the wastewater network, and the outlet end of the high-concentration pipeline is connected to the inlet end of the fine particle filtration device. A liquid concentration sensor is installed on the outlet pipeline. The metering and transfer unit includes an automatic metering device and a transfer device in sequence. The solids outlet ends of the large particle solid screening device, small particle solid screening device, and fine particle filtration device are respectively connected to the inlet end of the automatic metering device. The system also includes a PLC control system that is electrically connected to each sensor, the active gas extraction pump, the automatic metering device, and the transfer device.

[0009] Optionally, the gas outlet end of the water collection tank is connected to the gas extraction pipe via the active gas extraction pump.

[0010] Optionally, the large particle solid screening device and the small particle solid screening device are respectively equipped with screens arranged in an X-shaped fork.

[0011] Optionally, the large particle solid screening device and the small particle solid screening device are respectively inclined.

[0012] Optionally, the fine particle filtration device is equipped with multiple filter screens, and the multiple filter screens are arranged in order of decreasing diameter.

[0013] Optionally, the screen aperture diameter of the large particle solid screening device is 5 mm, the screen aperture diameter of the small particle solid screening device is 2 mm, and the minimum filter screen diameter of the fine particle filtration device is 0.5 mm.

[0014] Optionally, a first valve is provided on the low-concentration pipeline, and a second valve is provided on the high-concentration pipeline; the first valve and the second valve are electrically connected to the PLC control system, and the opening and closing of the first valve and the second valve are controlled by the liquid concentration information fed back by the liquid concentration sensor.

[0015] A control method for an intelligent underground coal-water separation system according to any of the above-described methods includes the following steps: S1. Preliminary separation of slag, water, and gas, and gas extraction: S101. Mixture Collection and Monitoring: The mixture of coal slag, water, and gas enters the water collection tank of the collection unit. The liquid level sensor monitors the liquid level in real time, the methane sensor monitors the gas concentration in real time, and the data is transmitted to the PLC control system. S102. Gas extraction triggering and execution: When the methane concentration sensor detects that the methane concentration in the water collection tank reaches 1%, the PLC control system controls the active gas extraction pump to start and extract the gas into the gas extraction pipeline. S103, Gas Extraction Stop Control: The methane concentration sensor continuously monitors the methane concentration in the water collection tank. When the concentration drops below the preset safety value of 0.5%, the PLC control system controls the active gas extraction pump to stop running. S104. Slurry pump delivery triggering and execution: A slurry pump is installed at the solid-liquid outlet of the water collection tank. When the liquid level sensor detects that the liquid level has reached the preset maximum height, the PLC control system controls the slurry pump to start and deliver the solid-liquid mixture to the primary large particle solid screening device. S105, Slurry Pump Stop Control: When the liquid level sensor detects that the liquid level has reached the preset minimum height, the PLC control system triggers the slurry pump to stop running. S2. Cinder grading and screening: S201, Solid-liquid mixture conveying: After the solid-liquid mixture (coal slag + water) is conveyed to the grading and screening unit, the laser sensor monitors the amount of solid-liquid mixture at the inlet of the screening device in real time and transmits the data to the PLC control system; S202, Primary Large Particle Screening: The primary large particle solid screening device is started. The PLC control system automatically adjusts the amplitude and frequency of the device according to the laser sensor data to separate large particles of coal slag with a diameter larger than the screen hole diameter. The large particles of coal slag fall into the automatic solid weighing device. S203, Secondary small particle screening: The filtrate (containing small coal slag particles) after primary screening flows into the secondary small particle solid screening device. Similar to S202, the PLC control system adjusts the amplitude and frequency according to the laser sensor data to separate small coal slag particles with a diameter between the primary and secondary screen apertures. The small coal slag particles also fall into the automatic solid weighing device. S3, Fine Particle Filtration and Liquid Treatment: S301, Filtrate Concentration Monitoring: The filtrate after secondary sieving flows into the liquid collector before the fine particle filtration device. The liquid concentration sensor monitors the filtrate concentration in real time and transmits the data to the PLC control system. S302. Secondary Filtration Judgment and Execution: When the filtrate concentration is higher than the preset threshold by 30%, the PLC control system controls the second valve to open and the first valve to close, allowing the filtrate to enter the fine particle filtration device through the high-concentration pipeline for secondary filtration, removing fine coal slag particles, and falling into the automatic weighing device; when the filtrate concentration is lower than the preset threshold, the PLC control system controls the first valve to open and the second valve to close, allowing the filtrate to flow into the wastewater network through the low-concentration pipeline for discharge. S4. Automatic metering and transfer of solid materials: S401 Solid Weighing and Metering: The coal slag produced after filtration falls into the automatic solid weighing device. The weighing device transmits the real-time weighing data to the PLC control system to realize the automatic metering and data storage of solids. S402, Fixed-speed solid material transfer: When the weight of coal slag in the weighing device reaches the preset transfer threshold, the PLC control system controls the solid material transfer device to start and transfer the coal slag to the designated position at the preset speed. After the transfer is completed, the conveyor stops running.

[0016] Optional components include S0 and construction preparation. S001. Scheme Design and Parameter Preset: Based on the underground construction scenario and coal seam conditions, determine the installation location of the device, the connection method of each component, and preset key parameters such as methane concentration trigger value, liquid level height range, filtrate concentration threshold, and solid weight transfer threshold. S002. Equipment Inspection and Installation: Prepare all devices in the system, check the equipment's sealing, power supply and signal transmission stability, and complete the equipment assembly and connection according to the design plan. S003. Sensor and System Debugging: Calibrate the methane concentration sensor, liquid level sensor, laser sensor, liquid concentration sensor and automatic metering device; test the signal interaction between the PLC control system and each device to ensure real-time transmission of sensor data and accurate execution of control system commands.

[0017] The beneficial effects of this invention are as follows: This invention specifically relates to intelligent underground coal-water separation and automatic control technology, which is applicable to hydraulic construction scenarios such as hydraulic drilling, hydraulic slotting, hydraulic punching, and hydraulic cavity making in coal mines, and is used to solve the problems of separating coal slag, water, and gas mixtures and environmental management during construction.

[0018] This invention proposes an intelligent underground coal-water separation system and control method that integrates "multi-stage separation + intelligent sensing control + automatic metering and transfer". Through multi-device collaboration and precise control, it overcomes the limitations of traditional technologies and improves coal-water separation efficiency, gas extraction accuracy and standardized production level in mines.

[0019] (1) Significant environmental governance effect: By collecting slag, water and gas at the orifice and separating them throughout the entire process, coal slag and water are prevented from flowing to the ground, thus completely solving the problems of dirty, messy and poor construction environment and meeting the requirements of standardized production in mines.

[0020] (2) Graded screening and multi-stage filtration work together to improve separation efficiency and accuracy: The primary large particle screening device and the secondary small particle screening device work together with the fine particle filtration device. Through the X-shaped fork screen and multi-stage filter design, the efficient separation of coal slag with different particle sizes is achieved, especially the removal of fine particles with a diameter greater than 0.5 mm, which provides a guarantee for subsequent discharge. The synergy between graded screening and multi-stage filtration achieves efficient separation of coal slag with different particle sizes (large particles, small particles, and fine particles), and the separation efficiency is greatly improved compared with traditional devices. The combination of liquid concentration control and automatic metering meets the needs of evaluating the effect of hydraulic measures.

[0021] (3) Improved safety and efficiency of gas extraction: When the methane concentration exceeds the limit, the extraction pump is started quickly, which effectively avoids the gas exceeding the limit at the orifice and reduces safety risks; at the same time, the operation of the device does not affect the progress of hydraulic construction.

[0022] (4) Multi-dimensional intelligent sensing and precise control: integrate liquid level sensor, methane concentration sensor, laser sensor and liquid concentration sensor to realize real-time monitoring of liquid level, gas concentration, mixture volume and filtrate concentration. Combined with PLC control system, it realizes rapid triggering and automatic parameter adjustment of each process (such as pump start and stop, screening amplitude and frequency adjustment) to improve separation and extraction accuracy.

[0023] (5) Strong ability to adapt to complex working conditions: It is suitable for complex construction environments such as soft and low-permeability coal seams and deep high-stress coal seams, with significant stability and durability.

[0024] Full-process automation and unmanned operation: The entire process requires no manual intervention. The PLC control system enables automatic parameter adjustment and mode switching, reducing labor costs and improving construction efficiency. It also combines automatic metering and transportation to reduce manual labor intensity and achieve full-process automation of coal slag from separation, weighing to transportation. This meets the standardized production requirements of mines and provides an intelligent solution for underground gas control in coal mines.

[0025] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a connection diagram of the intelligent underground coal-water separation system of the present invention. Detailed Implementation

[0027] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0029] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they 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, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] Please see Figure 1 This is an intelligent underground coal-water separation system, which includes, in sequence, a collection unit, a grading and screening unit, a fine particle filtration device, and a metering and transfer unit.

[0031] The collection unit includes a water collection tank and a level sensor, a methane concentration sensor, and an active gas extraction pump installed on the water collection tank. The gas outlet of the water collection tank is connected to the gas extraction pipe through the active gas extraction pump. It is used to monitor the liquid level and gas concentration in the collection device in real time, and to provide data support for slag and water transportation and the triggering of the active gas extraction pump. The active gas extraction pump is driven by a variable frequency motor and is equipped with a methane concentration sensor to achieve rapid extraction when the gas concentration exceeds the limit value.

[0032] The grading and screening unit sequentially includes a large particle solid screening device, a small particle solid screening device, a liquid collector, and laser sensors respectively installed on the large particle solid screening device and the small particle solid screening device to monitor the amount of solid-liquid mixture and adjust screening parameters. The primary large particle solid screening device and the secondary small particle solid screening device are placed in different isolation chambers and are both inclined; the large particle solid screening device and the small particle solid screening device are respectively equipped with screens arranged in an X-shape.

[0033] The fine particle filtration device is equipped with multiple filter screens, which are arranged in descending order of diameter. Together with the liquid concentration sensor, it enables filtrate concentration monitoring and secondary filtration control.

[0034] Furthermore, the screen aperture diameter in the large particle solid screening device is 5mm, the screen aperture diameter in the small particle solid screening device is 2mm, and the minimum filter screen diameter in the fine particle filtration device is 0.5mm.

[0035] The outlet pipe of the liquid collector is connected to a low-concentration pipe and a high-concentration pipe. The outlet end of the low-concentration pipe is connected to the wastewater network, and the outlet end of the high-concentration pipe is connected to the inlet end of the fine particle filtration device. A liquid concentration sensor is installed on the outlet pipe.

[0036] Furthermore, a first valve is installed on the low-concentration pipeline, and a second valve is installed on the high-concentration pipeline; the first valve and the second valve are electrically connected to the PLC control system, and the opening and closing of the first valve and the second valve are controlled by the liquid concentration information fed back by the liquid concentration sensor.

[0037] The metering and transfer unit sequentially includes an automatic metering device, a transfer device, and the solids outlets of the large particle solid screening device, the small particle solid screening device, and the fine particle filtration device are respectively connected to the inlet of the automatic metering device. In some embodiments of the present invention, the transfer device is a belt conveyor, and the automatic metering device is a high-precision electronic scale.

[0038] The intelligent underground coal-water separation system also includes a PLC control system that is electrically connected to each sensor, active gas extraction pump, automatic metering device, and transfer device, and realizes automatic control of the functions of each device based on the monitoring data of each sensor.

[0039] A control method for the aforementioned intelligent underground coal-water separation system includes the following steps: S0. Construction Preparation: S001. Scheme Design and Parameter Preset: Based on the underground construction scenario in the coal mine (such as hydraulic drilling, perforation, etc.) and the coal seam conditions, determine the installation location of the device, the connection method of each component, and preset key parameters such as methane concentration trigger value, liquid level height range, filtrate concentration threshold, and solid weight transfer threshold.

[0040] S002. Equipment Inspection and Installation: Prepare all devices in the system, check the equipment's sealing, power supply and signal transmission stability, and complete the equipment assembly and connection according to the design plan.

[0041] S003. Sensor and System Debugging: Calibrate the methane concentration sensor, liquid level sensor, laser sensor, liquid concentration sensor and automatic metering device; test the signal interaction between the PLC control system and each device to ensure real-time transmission of sensor data and accurate execution of control system commands.

[0042] S1. Preliminary separation of slag, water, and gas, and gas extraction: S101. Mixture Collection and Monitoring: The mixture of coal slag, water, and gas generated during hydraulic construction enters the collection tank of the collection unit. The liquid level sensor monitors the liquid level in real time, and the methane sensor monitors the gas concentration in real time, and transmits the data to the PLC control system.

[0043] S102. Gas extraction triggering and execution: When the methane concentration sensor detects that the methane concentration in the water collection tank reaches 1%, the PLC control system can issue a command within 0.3-0.5 milliseconds to control the active gas extraction pump to start and extract the gas into the gas extraction pipeline.

[0044] S103. Gas extraction stop control: The methane concentration sensor continuously monitors the methane concentration in the water collection tank. When the concentration drops below the preset safety value of 0.5%, the PLC control system controls the active gas extraction pump to stop running.

[0045] S104. Slurry Pump Delivery Trigger and Execution: A slurry pump is installed at the solid-liquid outlet of the water collection tank. When the liquid level sensor detects that the liquid level has reached the preset maximum value, the PLC control system controls the slurry pump to start and deliver the solid-liquid mixture to the primary large particle solid screening device.

[0046] S105, Slurry Pump Stop Control: When the liquid level sensor detects that the liquid level has reached the preset minimum height, the PLC control system triggers the slurry pump to stop running.

[0047] S2. Cinder grading and screening: S201, Solid-Liquid Mixture Conveying: After the solid-liquid mixture (coal slag + water) is conveyed to the grading and screening unit, the laser sensor monitors the amount of solid-liquid mixture at the inlet of the screening device in real time and transmits the data to the PLC control system.

[0048] S202, Primary Large Particle Screening: The primary large particle solid screening device is started. The PLC control system automatically adjusts the amplitude and frequency of the device according to the laser sensor data to separate large particles of coal slag with a diameter greater than 5mm. The large particles of coal slag fall into the automatic solid weighing device.

[0049] S203, Secondary Small Particle Screening: The filtrate (containing small coal slag particles) after primary screening flows into the secondary small particle solid screening device. Similar to S202, the PLC control system adjusts the amplitude and frequency according to the laser sensor data to separate small coal slag particles with a diameter range of 2mm to 5mm. The small coal slag particles also fall into the automatic solid weighing device.

[0050] S3, Fine Particle Filtration and Liquid Treatment: S301, Filtrate Concentration Monitoring: The filtrate after secondary sieving flows into the collector before the fine particle filtration device. The liquid concentration sensor monitors the filtrate concentration in real time, and the data is transmitted to the PLC control system.

[0051] S302. Secondary Filtration Judgment and Execution: When the filtrate concentration is higher than the preset threshold of 30%, the PLC control system controls the second valve to open and the first valve to close, so that the filtrate enters the fine particle filtration device through the high-concentration pipeline for secondary filtration, filtering out fine coal slag particles with a diameter between 0.5mm and 2mm, and falling into the automatic weighing device; when the filtrate concentration is lower than the preset threshold of 30%, the PLC control system controls the first valve to open and the second valve to close, so that the filtrate flows into the wastewater network through the low-concentration pipeline and is discharged away.

[0052] In some embodiments of the present invention, the filter cleaning function of the fine particle filtration device is periodically triggered by the PLC control system to avoid filter clogging affecting filtration efficiency, and the filter is replaced according to the usage cycle.

[0053] S4. Automatic metering and transfer of solid materials: S401 Solid Weighing and Metering: The slag produced after filtration falls into the automatic solid weighing device, which transmits the real-time weighing data to the PLC control system to realize automatic solid weighing and data storage.

[0054] S402, Fixed-speed solid material transfer: When the weight of coal slag in the weighing device reaches the preset transfer threshold, the PLC control system controls the solid material transfer device to start and transfer the coal slag to the designated position at the preset speed. After the transfer is completed, the conveyor stops running.

[0055] The intelligent underground coal-water separation system of this invention integrates "multi-stage separation + intelligent sensing control + automatic metering and transfer". Through multi-device collaboration and precise control, it solves the limitations of traditional technology and improves coal-water separation efficiency, gas extraction accuracy and the standardization level of construction environment.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An intelligent underground coal-water separation system, characterized in that: The system comprises, in sequence, a collection unit, a grading and screening unit, a fine particle filtration device, and a metering and transfer unit. The collection unit includes a water collection tank and a liquid level sensor, a methane concentration sensor, and an active gas extraction pump mounted on the tank. The grading and screening unit includes, in sequence, a large particle solid screening device, a small particle solid screening device, a liquid collector, and laser sensors mounted on the large and small particle solid screening devices to monitor the solid-liquid mixture and adjust screening parameters. The liquid collector's outlet pipe is connected to a low-concentration pipe and a high-concentration pipe. The outlet end of the low-concentration pipe is connected to a wastewater network, and the outlet end of the high-concentration pipe is connected to the inlet end of the fine particle filtration device. A liquid concentration sensor is installed on the outlet pipe. The metering and transfer unit includes, in sequence, an automatic metering device and a transfer device. The solid outlet ends of the large particle solid screening device, the small particle solid screening device, and the fine particle filtration device are respectively connected to the inlet end of the automatic metering device. The system also includes a PLC control system electrically connected to each sensor, the active gas extraction pump, the automatic metering device, and the transfer device.

2. The intelligent underground coal-water separation system according to claim 1, characterized in that: The gas outlet of the water collection tank is connected to the gas extraction pipe via the active gas extraction pump.

3. The intelligent underground coal-water separation system according to claim 1, characterized in that: The large particle solid screening device and the small particle solid screening device are respectively equipped with screens arranged in an X-shape.

4. The intelligent underground coal-water separation system according to claim 1, characterized in that: The large particle solid screening device and the small particle solid screening device are respectively set at an angle.

5. The intelligent underground coal-water separation system according to claim 1, characterized in that: The fine particle filtration device is equipped with multiple filter screens, which are arranged in descending order of diameter.

6. The intelligent underground coal-water separation system according to claim 1, characterized in that: The sieve hole diameter of the large particle solid screening device is 5 mm, the sieve hole diameter of the small particle solid screening device is 2 mm, and the minimum filter screen diameter of the fine particle filtration device is 0.5 mm.

7. The intelligent underground coal-water separation system according to claim 1, characterized in that: A first valve is provided on the low-concentration pipeline, and a second valve is provided on the high-concentration pipeline. The first valve and the second valve are electrically connected to the PLC control system, and the opening and closing of the first valve and the second valve are controlled by the liquid concentration information fed back by the liquid concentration sensor.

8. A control method for an intelligent underground coal-water separation system according to any one of claims 1 to 7, characterized in that: Includes the following steps: S1. Preliminary separation of slag, water, and gas, and gas extraction: S101. Mixture Collection and Monitoring: The mixture of coal slag, water, and gas enters the water collection tank of the collection unit. The liquid level sensor monitors the liquid level in real time, the methane sensor monitors the gas concentration in real time, and the data is transmitted to the PLC control system. S102. Gas extraction triggering and execution: When the methane concentration sensor detects that the methane concentration in the water collection tank reaches 1%, the PLC control system controls the active gas extraction pump to start and extract the gas into the gas extraction pipeline. S103, Gas Extraction Stop Control: The methane concentration sensor continuously monitors the methane concentration in the water collection tank. When the concentration drops below the preset safety value of 0.5%, the PLC control system controls the active gas extraction pump to stop running. S104. Slurry pump delivery triggering and execution: A slurry pump is installed at the solid-liquid outlet of the water collection tank. When the liquid level sensor detects that the liquid level has reached the preset maximum height, the PLC control system controls the slurry pump to start and deliver the solid-liquid mixture to the primary large particle solid screening device. S105, Slurry Pump Stop Control: When the liquid level sensor detects that the liquid level has reached the preset minimum height, the PLC control system triggers the slurry pump to stop running. S2. Cinder grading and screening: S201, Solid-liquid mixture conveying: After the solid-liquid mixture (coal slag + water) is conveyed to the grading and screening unit, the laser sensor monitors the amount of solid-liquid mixture at the inlet of the screening device in real time and transmits the data to the PLC control system; S202, Primary Large Particle Screening: The primary large particle solid screening device is started. The PLC control system automatically adjusts the amplitude and frequency of the device according to the laser sensor data to separate large particles of coal slag with a diameter larger than the screen hole diameter. The large particles of coal slag fall into the automatic solid weighing device. S203, Secondary small particle screening: The filtrate (containing small coal slag particles) after primary screening flows into the secondary small particle solid screening device. Similar to S202, the PLC control system adjusts the amplitude and frequency according to the laser sensor data to separate small coal slag particles with a diameter between the primary and secondary screen apertures. The small coal slag particles also fall into the automatic solid weighing device. S3, Fine Particle Filtration and Liquid Treatment: S301, Filtrate Concentration Monitoring: The filtrate after secondary sieving flows into the liquid collector before the fine particle filtration device. The liquid concentration sensor monitors the filtrate concentration in real time and transmits the data to the PLC control system. S302. Secondary Filtration Judgment and Execution: When the filtrate concentration is higher than the preset threshold by 30%, the PLC control system controls the second valve to open and the first valve to close, allowing the filtrate to enter the fine particle filtration device through the high-concentration pipeline for secondary filtration, removing fine coal slag particles, and falling into the automatic weighing device; when the filtrate concentration is lower than the preset threshold, the PLC control system controls the first valve to open and the second valve to close, allowing the filtrate to flow into the wastewater network through the low-concentration pipeline for discharge. S4. Automatic metering and transfer of solid materials: S401 Solid Weighing and Metering: The coal slag produced after filtration falls into the automatic solid weighing device. The weighing device transmits the real-time weighing data to the PLC control system to realize the automatic metering and data storage of solids. S402, Fixed-speed solid material transfer: When the weight of coal slag in the weighing device reaches the preset transfer threshold, the PLC control system controls the solid material transfer device to start and transfer the coal slag to the designated position at the preset speed. After the transfer is completed, the conveyor stops running.

9. A control method for an intelligent underground coal-water separation system according to claim 8, characterized in that: It also includes S0 and construction preparation: S001. Scheme Design and Parameter Preset: Based on the underground construction scenario and coal seam conditions, determine the installation location of the device, the connection method of each component, and preset key parameters such as methane concentration trigger value, liquid level height range, filtrate concentration threshold, and solid weight transfer threshold. S002. Equipment Inspection and Installation: Prepare all devices in the system, check the equipment's sealing, power supply and signal transmission stability, and complete the equipment assembly and connection according to the design plan. S003. Sensor and System Debugging: Calibrate the methane concentration sensor, liquid level sensor, laser sensor, liquid concentration sensor and automatic metering device; test the signal interaction between the PLC control system and each device to ensure real-time transmission of sensor data and accurate execution of control system commands.

Images