Coal mine working face hypoxia control method and control device

Abstract

The invention relates to the technical field of coal mining, and discloses a coal mine working face hypoxia control method and device, and the method comprises the steps: 1, obtaining environment parameters; step 2, judging a hypoxia risk level, if no hypoxia risk exists, not carrying out hypoxia prevention and control, and if the hypoxia risk exists, carrying out the next step; 3, according to the low-oxygen risk level, a corresponding early warning signal is sent out, and the oxygen supply amount is controlled according to the low-oxygen risk level; 4, after oxygen is continuously supplied for a first preset duration, if the oxygen concentration is larger than a first preset value within a second preset duration, hypoxia prevention and control are completed; and if the oxygen concentration is lower than the first preset value within the second preset duration, repeating the steps 1-4 until the oxygen concentration is greater than the first preset value within the second preset duration. According to the prevention and treatment method, it can be ensured that the oxygen concentration rapidly rises in a high-risk scene, and waste caused by excessive oxygen supply in a low-risk scene can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mining, in particular to a coal mine working face low-oxygen prevention and control method and device. BACKGROUND

[0002] In the process of mining in a coal mine mining face, due to the influence of various factors such as complex geological conditions, unstable ventilation system, coal seam oxidation consuming oxygen, and harmful gas flowing into the goaf, the oxygen concentration in key areas such as the return air roadway and the mining face cut of the mining face is prone to decrease. The low-oxygen environment directly threatens the life safety of the operating personnel, causes dizziness, fatigue, and even suffocation and other safety accidents, and also affects the normal operation of the mining equipment and reduces the production efficiency.

[0003] At present, the prevention and control methods for the low-oxygen in the working face in the field of coal mines have limitations: some use a global continuous oxygen supply mode, lack dynamic monitoring and accurate judgment of the oxygen concentration, and are prone to waste or insufficient oxygen supply; some monitoring methods have unreasonable coverage range and do not focus on the low-oxygen high-risk areas, resulting in frequent risk misjudgment and misjudgment; and some prevention and control methods lack closed-loop management, only pay attention to oxygen supply operation, and do not continuously verify the prevention and control effect, which is difficult to ensure that the oxygen concentration is stable and meets the standards, and lacks an effective emergency response mechanism when the low-oxygen cannot be improved for a long time. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a coal mine working face low-oxygen prevention and control method and device.

[0005] In a first aspect, the present application provides a coal mine working face low-oxygen prevention and control method, the two sides of the mining face of a coal mine have an air inlet roadway and a return air roadway, and the air inlet roadway and the return air roadway have a mining face cut that connects the air inlet roadway and the return air roadway, comprising: Step one, obtaining the environmental parameters in the return air roadway and / or the mining face cut; Step two, judging the low-oxygen risk level according to the oxygen concentration in the environmental parameters, if there is no low-oxygen risk, no low-oxygen prevention and control is needed, if there is a low-oxygen risk, the next step is performed; Step three, according to the low-oxygen risk level, issuing a corresponding early warning signal, and controlling the oxygen supply amount into the return air roadway and / or the mining face cut according to the low-oxygen risk level; Step four, after the first preset duration of continuous oxygen supply, if the oxygen concentration in the return air roadway and / or the open-off cut of the mining face is greater than the first preset value within the second preset duration, the low-oxygen prevention is completed; if the oxygen concentration is lower than the first preset value within the second preset duration, steps one to four are repeated until the oxygen concentration is greater than the first preset value within the second preset duration; if the oxygen concentration has not returned to the safe range within the third preset duration since the first oxygen supply, the prevention fails, and a warning signal for taking emergency measures is sent out.

[0006] Optionally, the low-oxygen risk level is divided into four levels: no low-oxygen risk, 19.5%≤oxygen concentration; mild risk, 18%≤oxygen concentration<19.5%; moderate risk, 16%≤oxygen concentration<18%; and severe risk, oxygen concentration<16%.

[0007] Optionally, when the low-oxygen risk level is mild risk, the oxygen supply amount for the low-oxygen area is 5-10 m 3 / h, when the low-oxygen risk level is moderate risk, the oxygen supply amount for the low-oxygen area is 10-15 m 3 / h, and when the low-oxygen risk level is severe risk, the oxygen supply amount for the low-oxygen area is 15-20 m 3 / h.

[0008] In a second aspect, the present application provides a low-oxygen prevention device for a coal mine working face, comprising a data acquisition and processing system, and an oxygen supply unit, a sensor monitoring unit and a warning unit electrically connected to the data acquisition and processing system, wherein the oxygen supply unit, the sensor monitoring unit and the warning unit are arranged in the return air roadway and / or the open-off cut of the mining face; the data acquisition and processing system acquires environmental parameters in the return air roadway and / or the open-off cut of the mining face through the sensor monitoring unit; the oxygen concentration in the environmental parameters is used to determine the low-oxygen risk level; if there is a low-oxygen risk, the warning unit sends out a corresponding warning signal and the oxygen supply amount of the oxygen supply unit is adjusted according to the low-oxygen risk level; if the oxygen concentration in the return air roadway and / or the open-off cut of the mining face is greater than the first preset value within the second preset duration after the first preset duration of continuous oxygen supply, the low-oxygen prevention is completed; if the oxygen concentration is lower than the first preset value within the second preset duration, the oxygen supply amount of the oxygen supply unit is adjusted according to the low-oxygen risk level at this time until the oxygen concentration is greater than the first preset value within the second preset duration; if the oxygen concentration has not returned to the safe range within the third preset duration since the first oxygen supply, the prevention fails, and the warning unit sends out a warning signal for taking emergency measures.

[0009] Optionally, the oxygen supply unit comprises an oxygen source, an oxygen supply pipeline and a distributed oxygen supply nozzle, the oxygen source and the distributed oxygen supply nozzle are communicated through the oxygen supply pipeline, a valve capable of adjusting the oxygen supply amount is arranged on the oxygen supply pipeline, the valve and the data acquisition and processing system are electrically connected, and the valve can adjust the oxygen supply amount according to the control instruction issued by the data acquisition and processing system.

[0010] Optionally, the early warning unit comprises an audible and visual alarm, a display screen and a ground remote monitoring end, the audible and visual alarm and the display screen are electrically connected with the data acquisition and processing system respectively, and the ground remote monitoring end is in communication connection with the data acquisition and processing system.

[0011] Optionally, the sensor monitoring unit comprises an oxygen concentration sensor, a temperature sensor, a humidity sensor and a harmful gas sensor.

[0012] Optionally, the harmful gas sensor comprises a carbon monoxide sensor and a methane sensor.

[0013] Optionally, the low-oxygen prevention and control device for the coal mine working face further comprises a power supply capable of supplying power to all electric appliances of the low-oxygen prevention and control device.

[0014] Compared with the prior art, the technical scheme provided by the embodiment of the present application has the following advantages: 1. By taking the environmental parameters in the return air roadway and / or the open-off cut of the mining working face as the core judgment basis, focusing on the key monitoring area of the low-oxygen risk, the change trend of the core indexes such as the oxygen concentration can be monitored in real time. Through targeted parameter acquisition, the problems of blindness of global monitoring and lack of key area monitoring are avoided, data support is provided for subsequent risk level judgment, and the problems of missed judgment and misjudgment of the low-oxygen risk caused by inaccurate monitoring are effectively reduced.

[0015] 2. By dividing the low-oxygen risk level according to the oxygen concentration, and corresponding to issuing different early warning signals and matching different oxygen supply amounts, the traditional one-size-fits-all prevention and control mode is broken. For the scene without low-oxygen risk, the oxygen supply measure does not need to be started, and unnecessary oxygen consumption can be avoided. For different levels of low-oxygen risk, the oxygen supply amount is accurately controlled, which can not only ensure that the oxygen concentration quickly rises to the safe range in the high-risk scene, but also avoid the waste caused by excessive oxygen supply in the low-risk scene, and the balance between safety prevention and control and economy is achieved.

[0016] 3. The effect verification of the second preset time length after continuous oxygen supply ensures that the oxygen concentration is stable and meets the standard, and avoids the safety risk caused by the rebound of the concentration after short-term oxygen supply. In addition, for the case that the oxygen concentration cannot rise to the safe range for a long time, the emergency measure early warning is triggered in time, the prevention and control means are quickly switched from the conventional control to the emergency disposal, and the life safety of the workers is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1A flow chart of a coal mine working face low oxygen prevention and treatment method provided for the first embodiment of the present application.

[0018] Figure 2 A structure schematic view of a coal mine working face low oxygen prevention and treatment device provided for the second embodiment of the present application.

[0019] Legend: 1, sensor monitoring unit; 2, power supply; 3, carbon monoxide sensor; 4, methane sensor; 5, temperature sensor; 6, oxygen concentration sensor; 7, distributed oxygen supply nozzle; 8, data acquisition and processing system; 9, early warning unit; 10, oxygen supply unit. DETAILED DESCRIPTION

[0020] One specific embodiment of the present application will be described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present application is not limited by the specific embodiment.

[0021] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the technical solutions of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0022] Embodiment I: As shown in Figure 1 The present embodiment provides a coal mine working face low oxygen prevention and treatment method, the coal mine's mining working face both sides have air inlet roadway and air return roadway, the air inlet roadway and the air return roadway have the mining working face cut eye which makes the air inlet roadway and the air return roadway communicate, comprising: Step one, obtain the environmental parameters in the air return roadway and / or the mining working face cut eye; Step two, judge the low oxygen risk level according to the oxygen concentration in the environmental parameters, if there is no low oxygen risk, low oxygen prevention and treatment is not needed, if there is low oxygen risk, the next step is performed; Step three, according to the low oxygen risk level, the corresponding early warning signal is sent out, and the oxygen supply amount into the air return roadway and / or the mining working face cut eye is controlled according to the low oxygen risk level; Step four, after the first preset time duration, if the oxygen concentration in the return air roadway and / or the open-off cut of the mining face is greater than the first preset value within the second preset time duration, the low-oxygen prevention and treatment is completed; if the oxygen concentration is lower than the first preset value within the second preset time duration, steps one to four are repeated until the oxygen concentration is greater than the first preset value within the second preset time duration; if the oxygen concentration has not returned to the safe range within the third preset time duration since the first oxygen supply, the prevention and treatment fails, and a warning signal is sent to take emergency measures.

[0023] In the embodiment, the first preset time duration is 1 minute, the second preset time duration is 10 minutes, the third preset time duration is 30 minutes, and the first preset value is 20%.

[0024] The low-oxygen risk level is divided into four levels: no low-oxygen risk is 19.5%≤oxygen concentration, mild risk is 18%≤oxygen concentration<19.5%, moderate risk is 16%≤oxygen concentration<18%, and severe risk is oxygen concentration<16%.

[0025] When the low-oxygen risk level is mild risk, the oxygen supply amount to the low-oxygen area is 5-10 m 3 / h, when the low-oxygen risk level is moderate risk, the oxygen supply amount to the low-oxygen area is 10-15 m 3 / h, and when the low-oxygen risk level is severe risk, the oxygen supply amount to the low-oxygen area is 15-20 m 3 / h.

[0026] In the embodiment, when the low-oxygen risk level is no low-oxygen risk, the oxygen supply amount is no oxygen supply or a small amount of oxygen supply, and the actual working condition is specific.

[0027] Embodiment two: For example, Figure 2As shown, the embodiment provides a coal mine working face low oxygen prevention and control device, which comprises a data acquisition and processing system 8, and an oxygen supply unit 10, a sensor monitoring unit 1 and a warning unit 9 respectively electrically connected with the data acquisition and processing system 8. The oxygen supply unit 10, the sensor monitoring unit 1 and the warning unit 9 are arranged in the air return roadway and / or the stoping working face cut; the data acquisition and processing system 8 obtains the environmental parameters in the air return roadway and / or the stoping working face cut through the sensor monitoring unit 1; and the oxygen concentration in the environmental parameters is used to judge the low oxygen risk level. If there is a low oxygen risk, the corresponding warning signal is sent out by the warning unit 9 according to the low oxygen risk level, and the oxygen supply amount of the oxygen supply unit 10 is adjusted. If the oxygen concentration in the air return roadway and / or the stoping working face cut is greater than the first preset value within the second preset time after the continuous oxygen supply for the first preset time, the low oxygen prevention and control is completed. If the oxygen concentration is lower than the first preset value within the second preset time, the oxygen supply amount of the oxygen supply unit 10 is adjusted according to the low oxygen risk level at this time until the oxygen concentration is greater than the first preset value within the second preset time. If the oxygen concentration has not returned to the safe range within the third preset time since the first oxygen supply, the prevention and control fails, and the warning unit 9 sends out the warning signal for taking emergency measures.

[0028] In the embodiment, the data acquisition and processing system 8 comprises a data receiving module, a data analysis module and a control instruction generating module. The data receiving module is used to receive the environmental parameters transmitted by the sensor monitoring unit 1. The data analysis module is preset with environmental parameter thresholds, including an oxygen concentration threshold (19.5%, volume fraction), a temperature threshold (30℃), a humidity threshold (85%) and a harmful gas concentration threshold (carbon monoxide ≤0.0024%, methane ≤0.5%). By comparing the received environmental parameters with the corresponding thresholds, it is determined whether there is a low oxygen risk in the working face and the low oxygen risk level. The control instruction generating module generates corresponding control instructions according to the risk level and sends out the corresponding control instructions.

[0029] The oxygen supply unit 10 comprises an oxygen source, an oxygen supply pipeline and a distributed oxygen supply nozzle 7. The oxygen source and the distributed oxygen supply nozzle 7 are communicated through the oxygen supply pipeline. A valve capable of adjusting the oxygen supply amount is arranged on the oxygen supply pipeline. The valve and the data acquisition and processing system 8 are electrically connected. The valve can adjust the oxygen supply amount according to the control instruction sent out by the data acquisition and processing system 8.

[0030] In the embodiment, the oxygen source is an oxygen storage tank. The distributed oxygen supply nozzle 7 is arranged along the working face and corresponds to the sensor monitoring unit 1 one by one.

[0031] The warning unit 9 comprises an audible and visual alarm, a display screen and a ground remote monitoring end. The audible and visual alarm and the display screen are electrically connected with the data acquisition and processing system 8 respectively. The ground remote monitoring end is communicatively connected with the data acquisition and processing system 8.

[0032] In the embodiment, the sound-light alarm is arranged at the working face operation area and the roadway entrance, the display screen is installed at the working face dispatching room to display the monitoring information, and the ground remote monitoring end is connected with the data acquisition and processing system 8 through wired or wireless communication.

[0033] The sensor monitoring unit 1 comprises an oxygen concentration sensor 6, a temperature sensor 5, a humidity sensor and a harmful gas sensor.

[0034] The harmful gas sensor comprises a carbon monoxide sensor 3 and a methane sensor 4.

[0035] The power supply 2 is further arranged to supply power to all the electric appliances of the coal mine working face low-oxygen prevention and treatment device.

[0036] The above is only some specific embodiments of the present application, but the embodiments of the present application are not limited to this, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present application.

Claims

1. A method for preventing low oxygen levels in a coal mine working face, wherein the coal mine working face has intake airway and return airway on both sides, and a working face cut-off point connecting the intake airway and return airway is provided, characterized in that, include: Step 1: Obtain environmental parameters within the return airway and / or the cut-off point of the longwall mining face; Step 2: Determine the hypoxia risk level based on the oxygen concentration in the environmental parameters. If there is no hypoxia risk, hypoxia prevention and control are not necessary. If there is a hypoxia risk, proceed to the next step. Step 3: Issue corresponding early warning signals based on the low oxygen risk level, and control the oxygen supply to the return air roadway and / or the cut-in of the mining face according to the low oxygen risk level. Step 4: After the first preset time of continuous oxygen supply, if the oxygen concentration in the return airway and / or the cut-off point of the longwall mining face is greater than the first preset value within the second preset time, then the hypoxia prevention and control is completed; if the oxygen concentration falls below the first preset value within the second preset time, then repeat steps 1 to 4 until the oxygen concentration is greater than the first preset value within the second preset time; if the oxygen concentration has not risen back to a safe range within the third preset time since the first oxygen supply, then the prevention and control has failed, and an early warning signal for taking emergency measures is issued.

2. The coal face low oxygen prevention and treatment method according to claim 1, characterized in that, The hypoxia risk level is divided into four levels: no hypoxia risk: 19.5% ≤ oxygen concentration, mild risk: 18% ≤ oxygen concentration < 19.5%, moderate risk: 16% ≤ oxygen concentration < 18%, and severe risk: oxygen concentration < 16%.

3. The coal face low oxygen prevention and treatment method according to claim 2, characterized in that, When the hypoxia risk level is mild risk, the oxygen supply amount to the hypoxic region is 5-10 m 3 / h, when the hypoxia risk level is moderate risk, the oxygen supply amount to the hypoxic region is 10-15 m 3 / h, and when the hypoxia risk level is severe risk, the oxygen supply amount to the hypoxic region is 15-20 m 3 / h.

4. A coal mine working face low oxygen prevention and control device, characterized in that, It includes a data acquisition and processing system (8), and an oxygen supply unit (10), a sensor monitoring unit (1) and an early warning unit (9) that are electrically connected to the data acquisition and processing system (8). The oxygen supply unit (10), the sensor monitoring unit (1) and the early warning unit (9) are located in the return air roadway and / or the cut-off of the mining face. The data acquisition and processing system (8) acquires environmental parameters in the return air roadway and / or the cut of the mining face through the sensor monitoring unit (1); and judges the low oxygen risk level based on the oxygen concentration in the environmental parameters. If there is a low oxygen risk, the control and early warning unit (9) issues a corresponding early warning signal and adjusts the oxygen supply unit (10) according to the low oxygen risk level. If the oxygen concentration in the return air roadway and / or the cut of the mining face is greater than the first preset value in the second preset time after continuous oxygen supply for the first preset time, then the low oxygen prevention and control is completed. If the oxygen concentration is lower than the first preset value in the second preset time, the oxygen supply unit (10) is adjusted according to the low oxygen risk level at this time until the oxygen concentration is greater than the first preset value in the second preset time. If the oxygen concentration does not rise to the safe range in the third preset time after the first oxygen supply, then the prevention and control fails, and the control and early warning unit (9) issues an early warning signal to take emergency measures.

5. The coal mine working face low oxygen prevention and control device according to claim 4, characterized in that, The oxygen supply unit (10) includes an oxygen source, an oxygen supply pipeline and a distributed oxygen supply nozzle (7). The oxygen source and the distributed oxygen supply nozzle (7) are connected through the oxygen supply pipeline. The oxygen supply pipeline is equipped with a valve that can adjust the amount of oxygen supplied. The valve is electrically connected to the data acquisition and processing system (8). The valve can adjust the amount of oxygen supplied according to the control command issued by the data acquisition and processing system (8).

6. The coal mine working face low oxygen prevention and control device according to claim 4, characterized in that, The early warning unit (9) comprises an audible and visual alarm, a display screen and a ground remote monitoring end, the audible and visual alarm and the display screen are electrically connected with the data acquisition and processing system (8), and the ground remote monitoring end is in communication connection with the data acquisition and processing system (8).

7. The coal mine working face low oxygen prevention and control device according to claim 4, characterized in that, The sensor monitoring unit (1) comprises an oxygen concentration sensor (6), a temperature sensor (5), a humidity sensor and a harmful gas sensor.

8. The coal mine working face low oxygen prevention and control device according to claim 7, characterized in that, The harmful gas sensor comprises a carbon monoxide sensor (3) and a methane sensor (4).

9. The coal mine face low oxygen prevention and treatment device of claim 4, wherein, The power supply (2) can supply power to all electric appliances of the low-oxygen prevention and treatment device of the coal mine working face.

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