Coal mine gas extraction device
By installing multiple sets of gas extraction mechanisms in coal mines and utilizing support pipe arrays and real-time monitoring systems, the problem of gas accumulation has been solved, achieving efficient and safe gas extraction and reducing energy consumption.
Patent Information
- Application Number
- CN202521607513.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-30
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-07-30
AI Technical Summary
Existing technologies are insufficient to effectively cover all gas-rich areas in coal seams, leading to gas accumulation in coal mines, posing safety hazards, and resulting in low extraction efficiency and high energy consumption.
Multiple gas extraction mechanisms are used, with a support pipe array covering the top of the mine. Combined with gas concentration sensors and controllers, real-time monitoring and targeted extraction are achieved. The solenoid valve is opened only when the concentration exceeds the standard for extraction, and a blower is used to create negative pressure to absorb the gas.
It has improved the coverage and efficiency of gas extraction, reduced system energy consumption, and ensured the safe and energy-efficient operation of coal mines.
Smart Images
Figure CN224679546U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of gas extraction equipment, specifically to a coal mine gas extraction device. Background Technology
[0002] Coal mine gas typically refers to a gaseous mixture generated and stored in coal seams and surrounding rocks during coal formation. Its main component is methane (CH4), accounting for 80% to 98%, with the remainder possibly including carbon dioxide, nitrogen, and small amounts of other hydrocarbon gases. The presence of methane in coal mines poses a significant safety hazard. When the methane concentration is between 5% and 16% (by volume), it is highly susceptible to explosion upon contact with an ignition source, making it one of the leading causes of coal mine accidents. Furthermore, methane has a relatively light molecular weight, with a density of approximately 0.554 kg / m³. 3 Because its density is much lower than that of air, methane gas in coal mines tends to rise and accumulate at the top of the mine. To prevent this accumulation, methane is extracted from the coal seam through drilling, thus improving safety. However, drilling for methane extraction requires careful planning of the borehole location, depth, and spacing based on the specific characteristics of the coal seam (such as thickness, methane content, and permeability) to ensure coverage of as many methane-rich areas as possible. However, the complex internal structure of coal seams, with numerous natural fractures and pore systems, leads to uneven methane distribution. Even with pre-extraction, it's difficult to cover all potential methane-rich areas. Furthermore, as mining activities continue, the existing geological stress balance is disrupted, potentially creating new fractures or altering the state of existing fractures, leading to new methane leaks. Therefore, drilling for methane extraction cannot effectively prevent methane accumulation in the mine, and its safety is not high. Utility Model Content
[0003] The present invention aims to provide a coal mine gas extraction device to solve the problem of gas accumulation in coal mines.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: a coal mine gas extraction device, comprising multiple extraction mechanisms connected in series via pipelines, wherein the extraction mechanism includes a gas extraction mechanism, a support frame, and a controller; The support frame is hollow, and a fan is fixedly connected to the top inner part of the support frame, with the fan's outlet facing the bottom of the support frame; The gas extraction mechanism includes a connector and multiple support pipes. One end of each support pipe is fixed to and connected to the connector, while the other end is a blind end. The multiple support pipes are arranged in a circular array around the connector, and each support pipe has multiple air holes. The connector is fixedly installed on the top of the support frame and connects the support pipes to the support frame. The controller is mounted on the support frame and is electrically connected to multiple gas concentration sensors and multiple solenoid valves. The gas concentration sensors are installed one-to-one on the support pipe, and the multiple solenoid valves are installed one-to-one at the connection between the support pipe and the connector.
[0005] The principle and advantages of this solution are as follows: In practical application, the support frame is vertically installed inside the mine tunnel, multiple support pipes are located at the top of the tunnel, and multiple extraction mechanisms are connected in series through pipelines to form an integrated extraction system that can cover different areas within the mine. Each support pipe's gas concentration sensor monitors the gas concentration in its corresponding area in real time and transmits the data synchronously to the controller. The controller, as the core control component, compares and analyzes the received concentration data. When the gas concentration in the area monitored by a certain support pipe exceeds a preset threshold, the controller immediately sends a signal to the solenoid valve at the connection point between that support pipe and the connector, causing the solenoid valve to open. If the concentration does not exceed the threshold, the solenoid valve remains closed, achieving targeted locking of high-concentration gas areas. Simultaneously, the controller starts the fan at the top of the support frame, blowing air downwards from the outlet to create airflow. This generates negative pressure inside the support frame, which is transmitted through the connector to the support pipe corresponding to the opened solenoid valve, creating suction within that pipe. This suction draws the gas from the covered area into the pipe through air vents, then sequentially through the connector and support frame into the series pipeline, ultimately being discharged from the mine.
[0006] Compared with existing technologies, this solution has several advantages: 1. It installs multiple extraction mechanisms within the mine tunnel. The circular array of support pipes covers a large area at the top of the mine. Gas concentration sensors monitor the gas concentration at the top of the tunnel in real time. When the gas concentration exceeds a threshold, the controller opens the corresponding solenoid valve, and the ventilation fan discharges the gas through the support pipes, connectors, and support frames into the pipeline. Thus, extraction is only performed when the gas concentration at a specific support pipe exceeds the standard, effectively preventing the accumulation of gas leaking from coal seam fissures at the top of the mine tunnel.
[0007] 2. This solution utilizes a closed-loop control system consisting of a gas concentration sensor, solenoid valve, and controller. Gas extraction is only initiated when a gas concentration exceeding the standard is detected in a specific support pipe, at which point the solenoid valve for that pipe is activated. This significantly improves extraction efficiency and reduces overall system energy consumption, achieving energy-saving operation.
[0008] 3. Multiple extraction units are connected in series through pipelines, but each unit has its own independent sensors and controllers. This ensures the overall connectivity of the system while giving each unit the ability to make independent judgments and responses.
[0009] 4. Real-time monitoring and immediate response to gas concentration are integrated into the extraction mechanism, and the controller makes rapid decisions, realizing real-time monitoring and proactive extraction.
[0010] Preferably, as an improvement, the pipeline is equipped with a check valve. In use, the check valve ensures that the extracted gas can only flow in the discharge direction and cannot flow back.
[0011] Preferably, as an improvement, the controller uses a microcontroller. The purpose is that microcontrollers are small in size, operate at low temperatures, and consume little power.
[0012] Preferably, as an improvement, the extraction mechanism further includes a sub-frame, and the connecting member is made of a square tube, with one end connected to the support rod and the other end fixedly connected to the sub-frame. This arrangement allows the support frame and sub-frame to be installed on both sides of the mine roadway, thus not obstructing the passage of workers and transport vehicles.
[0013] Preferably, as an improvement, the plurality of vents are evenly spaced and arranged laterally on the sidewall of the support pipe. This arrangement facilitates the extraction of methane from the top of the mine tunnel by the vents through negative pressure. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of a coal mine gas extraction device according to the present invention.
[0015] Figure 2 for Figure 1 A schematic diagram of the structure from a top view.
[0016] Figure 3 for Figure 1 A schematic diagram of the structure on the left side.
[0017] The reference numerals in the accompanying drawings include: 1. support pipe, 2. connector, 3. fan, 4. support frame, 5. pipe, 6. check valve, and 7. auxiliary frame. Detailed Implementation
[0018] The following detailed description illustrates the specific implementation methods: The basic implementation examples are as follows: Figure 1 Appendix Figure 2 and attached Figure 3 As shown: A coal mine gas extraction device includes multiple extraction mechanisms connected in series via a pipeline 5. Each extraction mechanism includes a gas extraction mechanism, a support frame 4, a sub-frame 7, and a controller (microcontroller). A check valve 6 is provided at the connection between the extraction mechanism and the pipeline 5.
[0019] The support frame 4 is hollow, and a fan 3 is fixedly connected to the top inner part of the support frame 4. The air outlet of the fan 3 faces the bottom of the support frame 4. The gas extraction mechanism includes a connector 2 and multiple support pipes 1. The connector 2 is made of a square tube. One end of the connector 2 is connected to the support frame 4 and communicates with the air inlet of the fan 3. The other end of the connector 2 is a blind end and is fixedly connected to the sub-frame 7. One end of each of the multiple support pipes 1 is fixed and communicates with the center of the upper surface of the connector 2. The other end is a blind end. The multiple support pipes 1 are arranged in a circular array with the connector 2 as the center. Each support pipe 1 is provided with multiple air holes. The multiple air holes are evenly spaced and arranged horizontally on the side wall of the support pipe 1. The connector 2 is fixedly installed on the top of the support frame 4 and communicates the support pipes 1 with the support frame 4.
[0020] The controller is mounted on the support frame 4 and is electrically connected to multiple gas concentration sensors and multiple solenoid valves. The gas concentration sensors are installed one-to-one on the support pipe 1, and the multiple solenoid valves are installed one-to-one at the connection between the support pipe 1 and the connector 2.
[0021] The specific implementation process is as follows: In practical applications, the support frame 4 is vertically installed inside the mine tunnel, with multiple support pipes 1 located at the top of the tunnel. Multiple extraction mechanisms are connected in series via pipes 5 to form an integrated extraction system that can cover different areas within the mine. A gas concentration sensor on each support pipe 1 monitors the gas concentration in its corresponding area in real time and transmits the data synchronously to the controller. The controller, as the core control component, compares and analyzes the received concentration data. When the gas concentration in the area monitored by a certain support pipe 1 exceeds a preset threshold, the controller immediately sends a signal to the solenoid valve at the connection point between that support pipe 1 and the connector 2, causing the solenoid valve to open. If the concentration does not exceed the threshold, the solenoid valve remains closed, achieving targeted locking of high-concentration gas areas. At the same time, the controller starts the fan 3 at the top of the support frame 4, and the air outlet of the unit blows air downward to form an airflow, which generates negative pressure inside the support frame 4. This negative pressure is transmitted to the support pipe 1 corresponding to the opened solenoid valve through the connector 2, so that suction is formed in the support pipe 1, and the gas in the area it covers is drawn into the pipe through the air hole. Then, it passes through the connector 2 and the support frame 4 in sequence and enters the series pipe 5, and is finally discharged from the mine.
[0022] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A coal mine gas extraction device, characterized in that: It includes multiple extraction mechanisms connected in series via pipelines. Each extraction mechanism includes a gas extraction mechanism, a support frame, and a controller. The support frame is hollow, and a fan is fixedly connected to the top inner part of the support frame, with the fan's outlet facing the bottom of the support frame; The gas extraction mechanism includes a connector and multiple support pipes. One end of each support pipe is fixed to and connected to the connector, while the other end is a blind end. The multiple support pipes are arranged in a circular array around the connector, and each support pipe has multiple air holes. The connector is fixedly installed on the top of the support frame and connects the support pipes to the support frame. The controller is mounted on the support frame and is electrically connected to multiple gas concentration sensors and multiple solenoid valves. The gas concentration sensors are installed one-to-one on the support pipe, and the multiple solenoid valves are installed one-to-one at the connection between the support pipe and the connector.
2. The coal mine gas extraction device according to claim 1, characterized in that: The pipeline is equipped with a check valve.
3. A coal mine gas extraction device according to claim 2, characterized in that: The controller uses a microcontroller.
4. A coal mine gas extraction device according to claim 3, characterized in that: The extraction mechanism also includes a sub-frame. The connecting piece is made of a square tube, with one end connected to the support rod and the other end fixedly connected to the sub-frame.
5. A coal mine gas extraction device according to claim 4, characterized in that: The multiple air holes are evenly spaced and arranged laterally on the side wall of the support tube.