Mine gas concentration early warning system based on space-time prediction model

Abstract

The present application relates to mine safety production system technical field, especially to a kind of mine gas concentration early warning system based on space-time prediction model.The present application provides a kind of mine gas concentration early warning system based on space-time prediction model, solve the technical problems that gas concentration early warning system in prior art is prone to false alarm and cannot be early warned when gas concentration does not reach upper limit.A kind of mine gas concentration early warning system based on space-time prediction model, including gas sensor, the gas sensor is distributed in mine, and the gas sensor is used to monitor the gas concentration in mine;By setting early warning component, early warning component when gas concentration is on long ascending amplitude less than first threshold value, change the ventilation efficiency of ventilation component, make the gas concentration in mine keep in the range that meets the requirement, ventilation component has been unable to meet the requirement of maintaining gas concentration, alarm unit sends alarm information, prompt relevant personnel to escape in time.

Description

Technical Field

[0001] This invention relates to the field of mine safety production system technology, and in particular to a mine gas concentration early warning system based on a spatiotemporal prediction model. Background Technology

[0002] Methane concentration monitoring is an important indicator for mine safety monitoring. It is used to monitor the methane concentration in the mine and to issue an alarm signal when the methane concentration exceeds a certain value.

[0003] In existing technologies, mines already possess relatively complete digital safety monitoring systems. Most gas concentration monitoring employs upper and lower limit-based methods. By setting upper and lower limits for data, abnormal data conforming to certain rules is detected, triggering early warnings and alarms. For example, an alarm is issued when the gas concentration exceeds the upper limit. However, this monitoring method can only trigger an alarm when the gas concentration reaches a certain value. In practice, mines typically have ventilation systems, which can lower the gas concentration. This means that this monitoring method is prone to false alarms in practical applications. Furthermore, this monitoring method cannot issue warnings when the gas concentration has not reached the upper limit.

[0004] Therefore, existing gas concentration early warning systems have technical problems such as being prone to false alarms and being unable to issue warnings when the gas concentration has not reached the upper limit. Summary of the Invention

[0005] The present invention provides a mine gas concentration early warning system based on a spatiotemporal prediction model, which solves the technical problems of existing gas concentration early warning systems being prone to false alarms and unable to issue early warnings when the gas concentration has not reached the upper limit.

[0006] Some implementation schemes for solving the above-mentioned technical problems include:

[0007] A mine gas concentration early warning system based on a spatiotemporal prediction model includes gas sensors distributed throughout the mine, and the gas sensors are used to monitor the gas concentration within the mine.

[0008] A ventilation assembly for ventilating the mine shaft;

[0009] The system includes a warning component, which comprises a data processing unit and a control unit. The gas sensor communicates with the data processing unit, and the control unit communicates with the data processing unit. The warning component also includes an alarm unit, and both the alarm unit and the ventilation component are controlled by the control unit.

[0010] The gas sensor monitors the gas concentration at different locations in the mine in real time.

[0011] The data processing unit processes the gas concentration monitored by the gas sensor by using a space-time prediction model to obtain a gas concentration change trend at different positions, the gas concentration change trend refers to the change amplitude of the gas concentration per unit time;

[0012] When the gas concentration change trend is a downward trend, the gas sensor continues to monitor the gas concentration in real time;

[0013] When the gas concentration change trend is an upward trend and the upward amplitude of the gas concentration per unit time is less than a first threshold value, the control unit changes the ventilation efficiency of the ventilation assembly;

[0014] When the gas concentration change trend is an upward trend and the upward amplitude of the gas concentration per unit time is greater than or equal to a second threshold value, the control unit changes the ventilation efficiency of the ventilation assembly and controls the alarm unit to alarm, the second threshold value is greater than the first threshold value;

[0015] When the ventilation assembly is at the maximum ventilation efficiency and the change trend of the gas concentration is still an upward trend, the control unit controls the alarm unit to alarm and prompts an escape duration by the alarm unit, the escape duration is the duration used by the data processing unit to predict that the gas concentration reaches a dangerous threshold value, the dangerous threshold value is that the gas concentration is greater than or equal to 50%.

[0016] As a preferred, the prediction method of the escape duration comprises the following steps:

[0017] Obtaining a gas concentration value of a current node;

[0018] Obtaining a gas concentration value of a previous node;

[0019] Obtaining a gas concentration change value by subtracting the gas concentration value of the previous node from the gas concentration value of the current node;

[0020] Obtaining a time difference between the current node and the previous node, and obtaining an upward trend of the gas concentration by dividing the gas concentration change value by the time difference between the current node and the previous node;

[0021] Determining the escape duration according to the upward trend of the gas concentration and the dangerous threshold value of the gas concentration.

[0022] As a preferred, in the step of obtaining the upward trend of the gas concentration by dividing the gas concentration change value by the time difference between the current node and the previous node, the gas concentration change value is an average value of at least three continuous gas concentration change values.

[0023] As a preferred, the ventilation assembly comprises ventilation openings, the ventilation assembly comprises a plurality of ventilation openings, and at least one ventilation opening is arranged around each gas sensor.

[0024] As preferred, the ventilation assembly further comprises a fan, the fan supplies air to the mine through a pipeline, and the ventilation opening is formed at an opening of the pipeline close to the gas sensor.

[0025] As preferred, the fan is a variable frequency fan.

[0026] As preferred, the ventilation assembly further comprises a wind deflector, the wind deflector is rotationally connected to the pipeline, the airflow output by the ventilation opening is uniformly distributed around the wind deflector through the wind deflector, the wind deflector is provided with an air outlet, and the airflow output by the ventilation opening blows along the tangential direction of the inner wall of the wind deflector.

[0027] As preferred, the gas sensors are uniformly distributed in the mine.

[0028] As preferred, the gas sensors are fixed to the mine through a mounting assembly, the mounting assembly comprises a fixed seat fixed to the mine and a rotating seat rotationally connected to the fixed seat, the rotating seat is provided with a protective cover covering the gas sensor, and the protective cover is uniformly provided with through holes.

[0029] As preferred, the fixed seat is further provided with a motor driving the rotating seat to rotate, and the protective cover is provided with an LED lamp indicating the position of the protective cover.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] By arranging the early warning assembly, when the rising amplitude of the gas concentration is less than the first threshold value, the ventilation efficiency of the ventilation assembly is changed, so that the gas concentration in the mine is maintained within the required range, when the rising amplitude of the gas concentration is greater than or equal to the second threshold value and the ventilation efficiency of the ventilation assembly is changed, the gas concentration is maintained on the original basis, at this time, a fault or an unexpected situation may occur to cause the gas concentration to rise, the alarm unit sends an alarm signal to prompt relevant personnel to eliminate the fault, and when the ventilation unit is in a state of maximum ventilation efficiency, the gas concentration still shows an upward trend, at this time, the ventilation assembly cannot meet the requirement of maintaining the gas concentration, and the alarm unit sends an alarm signal to prompt relevant personnel to escape in time.

[0032] When the gas concentration rises and the ventilation assembly is in a state of maximum ventilation efficiency, the alarm unit prompts the escape time, relevant personnel can reasonably plan an escape path according to the prompted escape time, and when the escape time is relatively sufficient, relevant personnel can timely shut down relevant equipment to avoid further loss. BRIEF DESCRIPTION OF DRAWINGS

[0033] For purposes of explanation, several embodiments of the inventive technology are set forth in the following Figures. The Figures are incorporated herein and constitute part of this specification. In some cases, well-known structures and components are shown in block diagram form in order to avoid obscuring the inventive concept of the subject technology.

[0034] Figure 1 is a block diagram of the structure of the present invention.

[0035] Figure 2 is a flow chart of the operation of the present invention.

[0036] Figure 3 is a schematic view of the air deflector.

[0037] Figure 4 is a schematic view of the mounting assembly.

[0038] Shown in the figure:

[0039] 1. Gas sensor.

[0040] 2. Ventilation assembly.

[0041] 3. Early warning assembly, 31. Data processing unit, 32. Control unit, 33. Alarm unit.

[0042] 4. Air deflector.

[0043] 5. Mounting assembly, 51. Swivel seat, 52. Fixed seat, 53. Protective cover. DETAILED DESCRIPTION

[0044] The specific embodiments shown are intended to be illustrative of the various configurations of the subject technology and are not intended to limit the scope of the subject technology. The specific embodiments include specific details for the purpose of providing a thorough understanding of the subject technology. However, it will be apparent to those skilled in the art that the subject technology can be practiced without these specific details.

[0045] It is to be understood that the terminology, such as "first" and "second", etc., used herein is intended to distinguish one entity or operation from another one, and is not intended to imply any actual relationship or sequence between the entities or operations.

[0046] The terms "comprise", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0047] Referring to Figures 1 to 4 A mine gas concentration early warning system based on a space-time prediction model is shown, which comprises a gas sensor 1, the gas sensor 1 is distributed in a mine, and the gas sensor 1 is used to monitor the gas concentration in the mine;

[0048] A ventilation assembly 2, the ventilation assembly 2 is used to ventilate the mine;

[0049] And a warning assembly 3, the warning assembly 3 comprises a data processing unit 31 and a control unit 32, the gas sensor 1 communicates with the data processing unit 31, the control unit 32 communicates with the data processing unit 31, the warning assembly 3 further comprises an alarm unit 33, the alarm unit 33 and the ventilation assembly 2 are both controlled by the control unit 32;

[0050] Among them, the gas sensor 1 monitors the gas concentration in different positions of the mine in real time;

[0051] The data processing unit 31 processes the gas concentration monitored by the gas sensor 1 to obtain the gas concentration change trend at different positions by using a space-time prediction model, and the gas concentration change trend refers to the change amplitude of the gas concentration per unit time;

[0052] When the gas concentration change trend is a downward trend, the gas sensor 1 continues to monitor the gas concentration in real time;

[0053] When the gas concentration change trend is an upward trend and the upward amplitude of the gas concentration per unit time is less than a first threshold value, the control unit 32 changes the ventilation efficiency of the ventilation assembly 2;

[0054] When the gas concentration change trend is an upward trend and the upward amplitude of the gas concentration per unit time is greater than or equal to a second threshold value, the control unit 32 changes the ventilation efficiency of the ventilation assembly 2 and controls the alarm unit 33 to alarm, and the second threshold value is greater than the first threshold value;

[0055] When the ventilation assembly 2 is at the maximum ventilation efficiency and the change trend of the gas concentration is still rising, the control unit 32 controls the alarm unit 33 to alarm and prompts the escape time by the alarm unit 33, the escape time is the time length used by the data processing unit 31 to predict the gas concentration to reach the dangerous threshold, the dangerous threshold is that the gas concentration is greater than or equal to 50%.

[0056] In some embodiments, the prediction method of the escape time comprises the following steps:

[0057] Obtaining the gas concentration value of the current node;

[0058] Obtaining the gas concentration value of the previous node;

[0059] Obtaining the gas concentration change value by subtracting the gas concentration value of the previous node from the gas concentration value of the current node;

[0060] Obtaining the time difference between the current node and the previous node, and obtaining the rising trend of the gas concentration by dividing the gas concentration change value by the time difference between the current node and the previous node;

[0061] Determining the escape time according to the rising trend of the gas concentration and the dangerous threshold of the gas concentration.

[0062] In some embodiments, in the step of obtaining the rising trend of the gas concentration by dividing the gas concentration change value by the time difference between the current node and the previous node, the gas concentration change value is the average value of at least three consecutive gas concentration change values.

[0063] Referring to Figure 2 As shown in the figure, in practice, first, the gas sensor 1 is arranged in the mine, the gas sensor 1 can be uniformly distributed in the mine, or the gas sensor 1 can also be arranged only at the position to be monitored.

[0064] Then, the ventilation assembly 2 is arranged in the mine, the ventilation assembly 2 can be one or more, and the ventilation assembly 2 should be able to ventilate each position in the mine, so that the air inside the mine is in a flowing state, and a better working environment is provided for the operating personnel.

[0065] Finally, the ventilation assembly 2 and the gas sensor 1 are electrically connected with the early warning assembly 3, and the construction of the early warning system is completed.

[0066] The early warning system works by the following method:

[0067] The gas sensor 1 monitors the gas concentration in the mine in real time;

[0068] The data processing unit 31 of the early warning assembly 3 processes the gas concentration collected by the gas sensor 1, for example, judges the rising amplitude of the gas concentration in the mine within a unit time, for example, the rising value of the gas concentration in the mine within 1 minute;

[0069] When the rising amplitude of the gas within 1 minute is relatively small, that is, less than the first threshold value, it indicates that the rising amplitude of the gas concentration is within a reasonable range. At this time, the gas concentration in the mine can be kept within a required range by changing the ventilation efficiency of the ventilation assembly 2, so as to provide a better working environment for the workers.

[0070] When the rising amplitude of the gas within 1 minute is relatively large, that is, greater than or equal to the second threshold value, it indicates that the rising amplitude of the gas concentration is not within a reasonable range. It may be that the rising amplitude of the gas concentration is increased due to misoperation or equipment damage. At this time, the early warning assembly 3 further increases the ventilation efficiency of the ventilation assembly 2, and at the same time, sends an alarm information to prompt the relevant personnel to eliminate the fault. The alarm information can be the first type of alarm information.

[0071] When the rising amplitude of the gas within 1 minute is relatively large, that is, greater than or equal to the second threshold value, and the ventilation assembly 2 is already in a state of maximum ventilation efficiency, at this time, it is impossible to maintain the gas concentration in the mine only by using the ventilation assembly 2. At this time, the alarm unit 33 of the early warning assembly 3 sends the second type of alarm information to prompt the relevant personnel to escape in time.

[0072] It can be understood that although the rising amplitude of the gas concentration has exceeded the second threshold value, the gas concentration in the mine will not reach the dangerous threshold value in a very short time. That is, with the rising amplitude of the gas concentration, a certain time is needed for the gas concentration to reach the dangerous threshold value, for example, 10 minutes or 30 minutes, etc. The time is the escape time.

[0073] The alarm unit 33 can send the alarm information in the form of countdown, for example, there are 30 minutes left before the gas concentration reaches the dangerous threshold value, etc. At this time, the workers can know how much time is left before the gas concentration in the mine reaches the dangerous threshold value, and the workers can evacuate in an orderly manner to prevent stampede accidents.

[0074] In some embodiments, the ventilation assembly 2 includes ventilation openings, and there are a plurality of ventilation openings, and at least one ventilation opening is arranged around each gas sensor 1.

[0075] In some embodiments, the ventilation assembly 2 further includes a fan, and the fan supplies air to the mine through a pipeline, and the opening of the pipeline close to one end of the gas sensor 1 is the ventilation opening.

[0076] In some embodiments, the fan is a variable frequency fan.

[0077] It can be understood that when the mine is not suitable for setting multiple fans, a small number of fans can be used in combination with pipelines to blow air to the target position. The pipeline can be a hose, so that the pipeline can be arranged at any position in the mine, so that the gas concentration in the mine meets the requirements.

[0078] Referring to Figure 3 In some embodiments, the ventilation assembly 2 further includes a wind guide cover 4, which is rotationally connected to the pipeline. The airflow output by the ventilation port is uniformly distributed around the wind guide cover 4, and the wind guide cover 4 is provided with an air outlet. The airflow output by the ventilation port blows along the tangent of the inner wall of the guide cover.

[0079] It can be understood that the wind guide cover 4 is mainly used to uniformly distribute the airflow, so that the airflow input by the fan is more uniformly distributed in the mine. The wind guide cover 4 is rotated by the airflow and does not need to be provided with an independent driving source.

[0080] In some embodiments, the gas sensors 1 are uniformly distributed in the mine.

[0081] Referring to Figure 4 In some embodiments, the gas sensors 1 are fixed to the mine through a mounting assembly 5. The mounting assembly 5 includes a fixed seat 52 fixed to the mine and a rotating seat 51 rotationally connected to the fixed seat 52. The rotating seat 51 is provided with a protective cover 53 covering the gas sensor 1, and the protective cover 53 is uniformly provided with through holes.

[0082] In some embodiments, the fixed seat 52 is further provided with a motor for driving the rotating seat 51 to rotate, and the protective cover 53 is provided with an LED lamp for indicating the position of the protective cover 53.

[0083] In some embodiments, the LED lamp can be powered by a battery.

[0084] It can be understood that by providing a motor, the gas sensor 1 can rotate around the fixed seat 52, so that the gas sensor 1 can detect the gas concentration in all directions, improving the monitoring accuracy of the gas sensor 1.

[0085] The spatiotemporal prediction model preprocesses the collected gas concentration data, including data cleaning, outlier detection and processing, etc. The processed data is stored in a database for subsequent analysis and prediction.

[0086] The spatiotemporal prediction model can be a spatiotemporal neural network model (such as STELM), a spatiotemporal autocorrelation STARMA model, and a model based on a graph neural network (such as AGCN-WaveNet). These models can comprehensively consider the spatiotemporal characteristics of gas concentration, improving the prediction accuracy.

[0087] The above describes the subject technical solutions of the present application and corresponding details. It should be understood that the above description is only some embodiments of the subject technical solutions of the present application, and some details can be omitted in the specific implementation.

[0088] In addition, in some embodiments of the above application, multiple embodiments can be combined for implementation, and various combination solutions are not listed one by one due to the length of the article. Those skilled in the art can freely combine the above embodiments according to the needs in the specific implementation to obtain a better application experience.

[0089] Those skilled in the art can obtain other detailed configurations or drawings when implementing the subject technical solutions of the present application according to the subject technical solutions of the present application and the drawings. Obviously, these details still belong to the scope covered by the subject technical solutions of the present application without departing from the subject technical solutions of the present application.

Claims

1. A mine gas concentration early warning system based on a space-time prediction model, characterized in that: The application relates to a mine gas concentration monitoring and early warning system, which comprises a gas sensor (1), a ventilation assembly (2) and a pre-warning assembly (3). The gas sensor (1) is distributed in a mine and used for monitoring the gas concentration in the mine; the ventilation assembly (2) is used for ventilating the mine; and the pre-warning assembly (3) comprises a data processing unit (31) and a control unit (32), the gas sensor (1) communicates with the data processing unit (31), the control unit (32) communicates with the data processing unit (31), the pre-warning assembly (3) further comprises an alarm unit (33), and the alarm unit (33) and the ventilation assembly (2) are both controlled by the control unit (32). The gas sensor (1) monitors the gas concentration at different positions in the mine in real time; the data processing unit (31) processes the gas concentration monitored by the gas sensor (1) by using a space-time prediction model to obtain the gas concentration change trend at different positions, wherein the gas concentration change trend refers to the change amplitude of the gas concentration per unit time; when the gas concentration change trend presents a downward trend, the gas sensor (1) continues to monitor the gas concentration in real time; when the gas concentration change trend presents an upward trend and the upward amplitude of the gas concentration per unit time is less than a first threshold value, the control unit (32) changes the ventilation efficiency of the ventilation assembly (2); when the gas concentration change trend presents an upward trend and the upward amplitude of the gas concentration per unit time is greater than or equal to a second threshold value, the control unit (32) changes the ventilation efficiency of the ventilation assembly (2) and controls the alarm unit (33) to alarm, wherein the second threshold value is greater than the first threshold value; when the ventilation assembly (2) is under the maximum ventilation efficiency and the gas concentration change trend still presents an upward trend, the control unit (32) controls the alarm unit (33) to alarm and prompts an escape duration by the alarm unit (33), wherein the escape duration is the duration used by the data processing unit (31) for predicting the gas concentration when the gas concentration reaches a dangerous threshold value, and the dangerous threshold value is that the gas concentration is greater than or equal to 50%.

2. The mine gas concentration early warning system based on a space-time prediction model according to claim 1, characterized in that: The escape duration prediction method comprises the following steps: obtaining the gas concentration value of a current node; obtaining the gas concentration value of a previous node; obtaining a gas concentration change value by subtracting the gas concentration value of the previous node from the gas concentration value of the current node; obtaining the time difference between the current node and the previous node, and obtaining the upward trend of the gas concentration by dividing the gas concentration change value by the time difference between the current node and the previous node; determining the escape duration according to the upward trend of the gas concentration and the dangerous threshold value of the gas concentration.

3. The mine gas concentration early warning system based on a space-time prediction model according to claim 2, characterized in that: In the step of obtaining the upward trend of the gas concentration by dividing the gas concentration change value by the time difference between the current node and the previous node, the gas concentration change value is the average value of at least three continuous gas concentration change values.

4. The mine gas concentration early warning system based on a space-time prediction model according to claim 1, characterized in that: The ventilation assembly (2) comprises ventilation openings, and a plurality of ventilation openings are arranged around each gas sensor (1).

5. The mine gas concentration early warning system based on a space-time prediction model according to claim 4, characterized in that: The ventilation assembly (2) further comprises a fan which supplies air to the mine through a pipeline, and the opening of one end of the pipeline close to the gas sensor (1) is the ventilation opening.

6. The mine gas concentration early warning system based on a space-time prediction model according to claim 5, characterized in that: The fan is a variable frequency fan.

7. The mine gas concentration early warning system based on a space-time prediction model according to claim 5, characterized in that: The ventilation assembly (2) further comprises a wind guide cover (4) which is rotationally connected to the pipeline, the airflow output by the ventilation opening is uniformly distributed around the wind guide cover (4) through the wind guide cover (4), the wind guide cover (4) is provided with an air outlet, and the airflow output by the ventilation opening blows along the tangent direction of the inner wall of the wind guide cover.

8. The mine gas concentration early warning system based on a space-time prediction model according to claim 1, characterized in that: The gas sensors (1) are uniformly distributed in the mine.

9. The mine gas concentration early warning system based on a space-time prediction model according to claim 8, characterized in that: The gas sensors (1) are fixed to the mine through a mounting assembly (5), the mounting assembly (5) comprises a fixed seat (52) fixed to the mine and a rotating seat (51) rotationally connected to the fixed seat (52), the rotating seat (51) is provided with a protective cover (53) covering the gas sensor (1), and the protective cover (53) is uniformly provided with through holes.

10. The mine gas concentration early warning system based on a space-time prediction model according to claim 9, characterized in that: The fixed seat (52) is further provided with a motor for driving the rotating seat (51) to rotate, and the protective cover (53) is provided with an LED lamp for prompting the position of the protective cover (53).

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