Coal dust sensing and early warning system of gas extraction pipe network and working method of coal dust sensing and early warning system

Abstract

The invention discloses a coal dust sensing and early warning system for a gas extraction pipe network and a working method of the coal dust sensing and early warning system. After monitoring parameters of a signal acquisition unit reach a preset threshold value, a signal is transmitted to a control unit, and meanwhile, ground remote monitoring is realized by accessing a remote control display system through an underground ring network switch; after the control unit receives the signal, if the risk is the coal dust accumulation risk, an adjacent manual and electric dual-purpose butterfly valve is triggered to be automatically closed, and early warning information is synchronously displayed on a remote control display system and prompts to clean the coal dust; if special dangerous cases such as local combustion exist, the manual and electric dual-purpose butterfly valve of the extraction main pipe is triggered to be completely closed so as to control the dangerous cases; after the pulverized coal is cleaned or the dangerous case is eliminated, the control unit receives a reset signal, the manual and electric dual-purpose butterfly valve is pushed to be opened again, the system is switched to a normal monitoring mode, then the functions of pulverized coal accumulation advanced early warning, timely cleaning and disaster prevention and control are achieved, and the system has the advantages of being comprehensive in monitoring, capable of responding in a grading mode, safe to operate and capable of supporting ground remote control.

Description

Technical Field

[0001] This invention belongs to the field of coal mine gas drainage drilling technology, specifically relating to a coal powder sensing and early warning system for gas drainage pipelines and its working method. Background Technology

[0002] During coal mine gas drainage, coal dust can easily slide along the drainage pipeline and accumulate at joints, valves, and bends, leading to abnormal airflow velocity, increased coal dust concentration, and potentially causing static electricity, spontaneous combustion, or abnormal gas pressure within the pipeline, resulting in pipeline blockage, gas outbursts, or even explosions. This is especially problematic in complex drainage scenarios in high-gas mines, where pipelines have numerous branches and operating conditions are highly variable, making it difficult for traditional monitoring methods to fully assess risks and resulting in lagging disaster prevention and control measures.

[0003] To address the aforementioned issues, mines typically employ distributed sensors and controllers for localized monitoring and control, or rely on manual inspections to identify potential hazards. However, this approach suffers from drawbacks such as limited monitoring parameters, difficulty in simultaneously sensing related risks related to airflow, coal dust, multi-gas concentrations, and temperature, delayed control response, difficulty in timely intervention in abnormal situations, poor component coordination, and a lack of efficient inter-equipment linkage. Furthermore, manual inspections are costly and inefficient. Existing integrated systems suffer from complex structures, high maintenance difficulty, and poor economic efficiency, making it difficult to meet the overall practicality and safety requirements of modern, efficient gas extraction. Therefore, there is an urgent need for a multi-component integrated monitoring and control system for gas extraction pipelines that offers comprehensive monitoring, rapid response, safe operation, and strong adaptability. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a comprehensive, rapid-response, safe, and economical coal dust sensing and early warning system for gas drainage pipelines, along with its operating method. Through innovative design involving multi-component collaboration and intelligent control, the system achieves real-time monitoring, graded early warning, and intelligent on / off control of multiple parameters such as pipeline airflow velocity, coal dust concentration, and gas concentration. This effectively prevents accidents such as gas eruptions and pipeline explosions, making the safety management of gas drainage pipelines more efficient, economical, and practical, thereby improving the overall safety and operational efficiency of coal mine gas drainage.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a coal powder sensing and early warning system for a gas extraction pipeline network, comprising a main extraction pipe, a control unit, a switch, and a control and display system. Several branch extraction pipes are connected in parallel at the lower part of the main extraction pipe. Each branch extraction pipe is connected to the outer port of an extraction screen pipe in a nearby borehole via an extraction bend in the middle. All branch extraction pipes are connected to an inclined drain pipe at their lower ends, with a drain valve connected to the lower end of the drain pipe. Several valves and detectors are installed on the main extraction pipe, with the valves and detectors arranged at intervals. The signal output terminals of the detectors are all connected to the signal input terminals of the control unit. The control unit is bidirectionally connected to the valve signals, and the control unit is bidirectionally connected to the control and display system via the switch.

[0006] The detector includes an airflow velocity sensor, a pulverized coal concentration sensor, a CH4 concentration sensor, a CO concentration sensor, and a temperature sensor. Each sensor adopts a modular integrated design and is fixed to a preset monitoring point on the main extraction pipe through explosion-proof treatment. The sensor probe is flush with or slightly convex with the inner wall of the main extraction pipe to collect multi-parameter information in the extraction pipeline network in real time and accurately. The collected data is transmitted to the control unit through signals.

[0007] The valve is an explosion-proof mining butterfly valve that can be used both manually and electrically. The valve body is made of cast steel, and the sealing surface is made of hard alloy welded. It has a built-in gear transmission mechanism and force transmission rod, and has dual functions of remote control and manual operation. The valve is controlled by a motor and handwheel. The butterfly valve is linked with the detector signal and receives the switch command from the control unit to realize automatic opening and closing. When manually operated, the valve position is adjusted by handwheel, gear transmission mechanism and force transmission rod, and the valve position status is fed back to the control display system in real time.

[0008] Both the main and branch extraction pipes are connected via flanges or clamps using straight pipes, multi-way pipes, or bends. Both pipes are made of high-pressure resistant and corrosion-resistant materials, and their inner walls are polished to reduce coal dust accumulation. The pressure-bearing capacity of both pipes is no less than the design pressure of the gas extraction system. The main extraction pipe is connected to the butterfly valve via flanges, with gas-corrosion-resistant fluororubber gaskets installed between the flanges. A tight connection is achieved using bolts. When using clamps to connect to the pipeline, rubber gaskets are installed inside the clamps to ensure airtightness at the installation location and to guarantee the airtightness of the gas extraction process.

[0009] The water discharge device is an automatic water discharge unit with a built-in switch and explosion-proof valve. It automatically opens to discharge water when the water level reaches the preset threshold to prevent the water seal from affecting the extraction efficiency. It automatically closes when the water level is lower than the preset low level. It also has a gas backflow prevention function during the water discharge process.

[0010] The control unit is an explosion-proof PLC controller with built-in data processing and logic control programs. It can store the monitoring data of the detectors and generate control commands. The switch is an intrinsically safe ring network switch for mining, which realizes the network interconnection of the control unit, detectors, butterfly valves and control display system. The control display system includes an underground touch screen and a ground-based host computer configuration interface, which can display pipeline parameters and equipment status in real time and support remote operation.

[0011] The working method of the coal powder sensing and early warning system for gas extraction pipeline network includes the following steps: S1. Assemble the coal powder sensing and early warning system for the extraction pipeline network; S2. Start monitoring and control. When abnormal gas parameters occur in the pipeline network, the early warning and control functions of the monitoring and control device will start working.

[0012] The specific operation process of step S1 is as follows: First, the system is assembled and debugged. The detector is installed at the designated monitoring point on the main extraction pipe through explosion-proof treatment. The sensor probe on the detector is installed in the same direction as the airflow. A valve is installed on the main extraction pipe. Then, the upper and lower ends of the branch extraction pipe are connected to the main extraction pipe and the drain pipe, respectively. Next, the two ends of the extraction bend are connected to the branch extraction pipe and the outer port of the extraction screen pipe in the borehole, respectively. A drainer is installed at the lower end of the drain pipe. The float sensitivity of the drainer is adjusted, the parameter threshold of the detector is set, and the logic control program of the control unit is configured. Then, the detector collects parameters such as the airflow velocity, coal powder concentration, CH4 concentration, CO concentration, and temperature of the pipeline network in real time at a preset frequency. The data is transmitted to the control unit through the signal. The control unit synchronously uploads the data to the control display system through the switch.

[0013] The specific process of step S2 is as follows: When the detector detects that the coal dust concentration or airflow velocity has reached the warning threshold, the control unit triggers the closure of the nearby butterfly valve and issues a "pipeline coal dust cleaning warning" on the control display system. If the CH4 concentration exceeds the limit or the CO concentration or temperature reaches the danger threshold, the control unit closes the butterfly valve in the corresponding area. If it is a special danger such as local combustion, all butterfly valves of the main extraction pipe of the coal roadway are triggered to close to control the danger in a local area. The butterfly valve closure status is simultaneously fed back to the control display system to prompt the operation and maintenance personnel to investigate and clean the coal dust. When the coal dust is cleaned up or the danger is eliminated, the operation and maintenance personnel send a reset command through the control unit or control display system, or after the sensor detects that the pipeline airflow velocity and coal dust concentration have reached the safe value, the control butterfly valve is reopened and the system returns to the normal extraction and monitoring mode.

[0014] Compared with related technologies, the present invention has the following beneficial effects by adopting the above technical solution: The coal dust sensing and early warning system device and method for gas drainage pipelines in this application realizes early warning of coal dust accumulation and gas anomalies in the pipeline network through real-time monitoring of multiple parameters by detectors, intelligent decision-making by control units, and hierarchical control of butterfly valves. This effectively prevents pipeline blockage, gas inrush and explosion accidents, and improves the safety management level and operational economy of the gas drainage pipeline network.

[0015] When coal dust slippage or accumulation occurs in the gas extraction pipeline network, it can lead to changes in airflow velocity, increased coal dust concentration, and may also cause static electricity, spontaneous combustion, or abnormal gas pressure within the pipeline. The coal dust sensing and early warning system device and method for gas extraction pipeline networks described in this application, when coal dust slippage or accumulation or abnormal gas parameters occur in the pipeline network, transmits the monitored parameters to the control unit. The control unit triggers the corresponding butterfly valves to close in stages and issues an early warning on the control display system. If the risk is coal dust accumulation, nearby butterfly valves close to prompt coal dust removal. If it is a special hazard such as localized combustion, all butterfly valves on the main extraction pipeline in the coal roadway are closed to isolate the risk and issue an early warning. After the hazard is eliminated or the coal dust is removed, the control unit receives a reset command, the butterfly valves reopen, and the system returns to normal monitoring mode. This achieves proactive risk prevention and efficient operation and maintenance of the pipeline network, solving the technical problems of lagging monitoring, passive control, and water accumulation affecting extraction efficiency in existing technologies. It features high safety, good economy, and strong practicality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of a butterfly valve; Figure 3 for Figure 1 Schematic diagram of the middle clamp; Figure 4 This is a schematic diagram showing the occurrence of coal dust slippage or accumulation within the extraction pipeline network. Figure 5 A schematic diagram showing the process of opening the butterfly valve to continue gas extraction after removing coal dust from the extraction pipeline. Detailed Implementation

[0017] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0018] like Figures 1-5As shown, the coal dust sensing and early warning system of the gas extraction pipeline network includes a main extraction pipe 1, a control unit 2, a switch 3, and a control and display system 4. Several branch extraction pipes 5 are connected in parallel at the lower part of the main extraction pipe 1. The middle part of each branch extraction pipe 5 is connected to the outer port of the extraction screen pipe in the adjacent borehole 7 through an extraction bend 6. All the branch extraction pipes 5 are connected to an inclined drain pipe 8 at the lower end. A drain device 9 is connected to the lower end of the drain pipe 8. Several valves 10 and detectors 11 are installed on the main extraction pipe 1. The valves 10 and detectors 11 are arranged at intervals. The signal output terminal of the detector 11 is connected to the signal input terminal of the control unit 2. The control unit 2 is bidirectionally connected to the signals of the valves 10. The control unit 2 is bidirectionally connected to the control and display system 4 through the switch 3.

[0019] The detector 11 includes an airflow velocity sensor, a coal powder concentration sensor, a CH4 concentration sensor, a CO concentration sensor, and a temperature sensor. Each sensor adopts a modular integrated design and is fixed to a preset monitoring point on the main extraction pipe 1 through explosion-proof treatment. The sensor probe is flush with or slightly convex with the inner wall of the main extraction pipe 1 to collect multi-parameter information in the extraction pipeline network in real time and accurately. The collected data is transmitted to the control unit 2 through a signal.

[0020] Valve 10 is an explosion-proof mining hand-operated butterfly valve. The valve body is made of cast steel, and the sealing surface is made of hard alloy welded. It has a built-in gear transmission mechanism 12 and a force transmission rod, and has dual functions of remote control and manual operation. Valve 10 is controlled by motor 13 and handwheel 14. The butterfly valve is linked with the detector 11 and receives the switch command from the control unit 2 to realize automatic opening and closing. In manual operation, the valve position is adjusted by handwheel, gear transmission mechanism 12 and force transmission rod, and the valve position status is fed back to the control display system 4 in real time.

[0021] Both the main extraction pipe 1 and the branch extraction pipe 5 are connected by straight pipes, multi-way pipes, and bends via flanges 16 or clamps 15. The main extraction pipe 1 and the branch extraction pipe 5 are made of high-pressure resistant and corrosion-resistant materials. The inner walls of the main extraction pipe 1 and the branch extraction pipe 5 are polished to reduce coal dust accumulation. The pressure-bearing capacity of the main extraction pipe 1 and the branch extraction pipe 5 is not lower than the design pressure of the gas extraction system. The interface between the main extraction pipe 1 and the butterfly valve is connected by flanges 16. Fluororubber gaskets resistant to gas corrosion are installed between the flanges 16, and a tight connection is achieved by bolts. When the clamps 15 are used to connect to the pipeline, rubber gaskets are installed on the inner side of the clamps 15 to ensure the airtightness of the installation location and the airtightness of the gas extraction process.

[0022] The water discharger 9 is an automatic water discharge device with a built-in switch and explosion-proof valve. It automatically opens to discharge water when the water level reaches the preset threshold to prevent the water seal from affecting the extraction efficiency. It automatically closes when the water level is lower than the preset low level. It also has a gas backflow prevention function during the water discharge process.

[0023] Control unit 2 is an explosion-proof PLC controller with built-in data processing and logic control programs. It can store the monitoring data of detector 11 and generate control commands. Switch 3 is an intrinsically safe ring network switch for mining, which realizes the network interconnection of control unit 2, detector 11, butterfly valve and control display system 4. Control display system 4 includes an underground touch screen and a ground host computer configuration interface, which can display pipeline parameters and equipment status in real time and support remote operation.

[0024] The working method of the coal powder sensing and early warning system for gas extraction pipeline network includes the following steps: S1. Assemble the coal powder sensing and early warning system for the extraction pipeline network; S2. Start monitoring and control. When abnormal gas parameters occur in the pipeline network, the early warning and control functions of the monitoring and control device will start working.

[0025] The specific operation process of step S1 is as follows: First, the system is assembled and debugged. The detector 11 is installed at the designated monitoring point on the main extraction pipe 1 through explosion-proof treatment. The sensor probe on the detector 11 is installed in the same direction as the airflow direction. The valve 10 is installed on the main extraction pipe 1. Then, the upper and lower ends of the branch extraction pipe 5 are connected to the main extraction pipe 1 and the drain pipe 8, respectively. Next, the two ends of the extraction bend 6 are connected to the branch extraction pipe 5 and the outer port of the extraction screen pipe inside the borehole 7, respectively. The drain device 9 is installed at the lower end of the drain pipe 8. The float sensitivity of the drain device 9 is debugged, the parameter threshold of the detector 11 is set, and the logic control program of the control unit 2 is configured. Then, the detector 11 collects parameters such as the airflow velocity, coal powder concentration, CH4 concentration, CO concentration and temperature of the pipeline network in real time at a preset frequency. The data is transmitted to the control unit 2 through the signal. The control unit 2 synchronously uploads the data to the control display system 4 through the switch 3.

[0026] The specific process of step S2 is as follows: When detector 11 detects that the coal powder concentration or airflow velocity has reached the warning threshold, control unit 2 triggers the closure of the nearby butterfly valve and issues a "pipeline coal powder cleaning warning" on control display system 4. If the CH4 concentration exceeds the limit or the CO concentration or temperature reaches the danger threshold, control unit 2 closes the corresponding area butterfly valve. If it is a special danger such as local combustion, all butterfly valves of the coal roadway main extraction pipe are triggered to close to control the danger in a local area, and the butterfly valve closure status is simultaneously fed back to control display system 4 to prompt maintenance personnel to investigate and clean the coal powder 17. When the coal powder 17 is cleaned up or the danger is eliminated, maintenance personnel send a reset command through control unit 2 or control display system 4, or after the sensor detects that the pipeline airflow velocity and coal powder concentration have reached the safe value, control the butterfly valve to reopen, and the system returns to the normal extraction monitoring mode.

[0027] The above embodiments illustrate the basic principles and features of the present invention, but are merely preferred embodiments and are not limited to these embodiments. Those skilled in the art, inspired by this patent, can make many modifications and improvements without departing from the spirit and scope of the claims, all of which fall within the scope of protection of the present invention. Therefore, the scope of this patent and its protection should be determined by the appended claims.

Claims

1. A coal powder sensing and early warning system for gas extraction pipelines, characterized in that: The system includes a main extraction pipe, a control unit, a switch, and a control and display system. Several branch extraction pipes are connected in parallel at the lower part of the main extraction pipe. Each branch extraction pipe is connected to the outer port of the extraction screen pipe in the adjacent borehole through an extraction bend in the middle. All branch extraction pipes are connected to an inclined drain pipe at the lower end, and a drain device is connected to the lower end of the drain pipe. Several valves and detectors are installed on the main extraction pipe. The valves and detectors are arranged at intervals. The signal output terminals of the detectors are all connected to the signal input terminals of the control unit. The control unit is bidirectionally connected to the valve signals. The control unit is bidirectionally connected to the control and display system through the switch.

2. The coal powder sensing and early warning system for gas extraction pipelines according to claim 1, characterized in that: The detector includes an airflow velocity sensor, a pulverized coal concentration sensor, a CH4 concentration sensor, a CO concentration sensor, and a temperature sensor. Each sensor adopts a modular integrated design and is fixed to a preset monitoring point on the main extraction pipe through explosion-proof treatment. The sensor probe is flush with or slightly convex with the inner wall of the main extraction pipe to collect multi-parameter information in the extraction pipeline network in real time and accurately. The collected data is transmitted to the control unit through signals.

3. The coal powder sensing and early warning system for gas extraction pipelines according to claim 1, characterized in that: The valve is an explosion-proof mining butterfly valve that can be used both manually and electrically. The valve body is made of cast steel, and the sealing surface is made of hard alloy welded. It has a built-in gear transmission mechanism and force transmission rod, and has dual functions of remote control and manual operation. The valve is controlled by a motor and handwheel. The butterfly valve is linked with the detector signal and receives the switch command from the control unit to realize automatic opening and closing. When manually operated, the valve position is adjusted by handwheel, gear transmission mechanism and force transmission rod, and the valve position status is fed back to the control display system in real time.

4. The coal powder sensing and early warning system for gas extraction pipelines according to claim 1, characterized in that: Both the main and branch extraction pipes are connected via flanges or clamps using straight pipes, multi-way pipes, or bends. Both pipes are made of high-pressure resistant and corrosion-resistant materials, and their inner walls are polished to reduce coal dust accumulation. The pressure-bearing capacity of both pipes is no less than the design pressure of the gas extraction system. The main extraction pipe is connected to the butterfly valve via flanges, with gas-corrosion-resistant fluororubber gaskets installed between the flanges. A tight connection is achieved using bolts. When using clamps to connect to the pipeline, rubber gaskets are installed inside the clamps to ensure airtightness at the installation location and to guarantee the airtightness of the gas extraction process.

5. The coal powder sensing and early warning system for gas extraction pipelines according to claim 1, characterized in that: The water discharge device is an automatic water discharge unit with a built-in switch and explosion-proof valve. It automatically opens to discharge water when the water level reaches the preset threshold to prevent the water seal from affecting the extraction efficiency. It automatically closes when the water level is lower than the preset low level. It also has a gas backflow prevention function during the water discharge process.

6. The coal powder sensing and early warning system for gas extraction pipelines according to claim 1, characterized in that: The control unit is an explosion-proof PLC controller with built-in data processing and logic control programs. It can store the monitoring data of the detectors and generate control commands. The switch is an intrinsically safe ring network switch for mining, which realizes the network interconnection of the control unit, detectors, butterfly valves and control display system. The control display system includes an underground touch screen and a ground-based host computer configuration interface, which can display pipeline parameters and equipment status in real time and support remote operation.

7. The working method of the coal powder sensing and early warning system for gas extraction pipeline network, characterized in that: Includes the following steps: S1. Assemble the coal powder sensing and early warning system for the extraction pipeline network; S2. Start monitoring and control. When abnormal gas parameters occur in the pipeline network, the early warning and control functions of the monitoring and control device will start working.

8. The coal powder sensing and early warning system for gas extraction pipelines according to claim 7, characterized in that: The specific operation process of step S1 is as follows: First, the system is assembled and debugged. The detector is installed at the designated monitoring point on the main extraction pipe through explosion-proof treatment. The sensor probe on the detector is installed in the same direction as the airflow. A valve is installed on the main extraction pipe. Then, the upper and lower ends of the branch extraction pipe are connected to the main extraction pipe and the drain pipe, respectively. Next, the two ends of the extraction bend are connected to the branch extraction pipe and the outer port of the extraction screen pipe in the borehole, respectively. A drainer is installed at the lower end of the drain pipe. The float sensitivity of the drainer is adjusted, the parameter threshold of the detector is set, and the logic control program of the control unit is configured. Then, the detector collects parameters such as the airflow velocity, coal powder concentration, CH4 concentration, CO concentration, and temperature of the pipeline network in real time at a preset frequency. The data is transmitted to the control unit through the signal. The control unit synchronously uploads the data to the control display system through the switch.

9. The coal powder sensing and early warning system for gas extraction pipelines according to claim 7, characterized in that: The specific process of step S2 is as follows: When the detector detects that the coal dust concentration or airflow velocity has reached the warning threshold, the control unit triggers the closure of the nearby butterfly valve and issues a "pipeline coal dust cleaning warning" on the control display system. If the CH4 concentration exceeds the limit or the CO concentration or temperature reaches the danger threshold, the control unit closes the butterfly valve in the corresponding area. If it is a special danger such as local combustion, all butterfly valves of the coal roadway main extraction pipe are triggered to close to control the danger in a local area. The butterfly valve closure status is simultaneously fed back to the control display system to prompt the operation and maintenance personnel to investigate and clean the coal dust. When the coal dust cleaning is completed or the danger is eliminated, the operation and maintenance personnel send a reset command through the control unit or control display system, or after the sensor detects that the pipeline airflow velocity and coal dust concentration have reached the safe value, the control butterfly valve is reopened, and the system returns to the normal extraction and monitoring mode.

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