Visualization method, device, equipment and medium for CO2 flow in closed pit mine

Abstract

The invention discloses a visualization method, device, equipment and medium for CO2 flow in a closed pit mine, and relates to the field of gas flowing, and the visualization method comprises the following steps: determining the position of a monitoring well for monitoring the CO2 concentration in the closed pit mine, and extracting CO2 concentration data detected at a certain moment at the position of the monitoring well; according to the CO2 concentration data of the determined monitoring well position, using a bilinear interpolation method to predict the CO2 concentration of an area where no monitoring well is arranged around, and obtaining a predicted CO2 concentration matrix; a thermodynamic diagram function in a data visualization tool is used for the CO2 concentration matrix to generate a CO2 concentration thermodynamic diagram; and splicing the CO2 concentration thermodynamic diagrams generated by the CO2 concentration data sets at multiple continuous moments, and analyzing CO2 flow according to the spliced thermodynamic diagrams. According to the method, the underground CO2 flow state can be determined through a visualization method.

Description

Technical Field

[0001] The present invention relates to the field of gas flow, and in particular to a method, device, equipment and medium for visualizing CO2 flow in a closed mine. Background Art

[0002] With the adjustment of my country's energy structure, backward production capacity in the coal industry has been gradually eliminated, resulting in an increasing number of closed mines and the formation of a large amount of underground space. How to utilize underground space has important research value, and the study of CO2 flow in underground space is a key issue.

[0003] In the prior art, sulfur hexafluoride SF6 gas tracer is used to monitor the flow of gas in underground space to observe whether leakage occurs.

[0004] However, existing methods cannot intuitively and clearly understand the state of CO2 flow in the well through visualization methods. Summary of the invention

[0005] The embodiments of the present invention provide a method, device, equipment and medium for visualizing the flow of CO2 in a closed mine, which can solve the problem in the prior art that the gas flow state underground cannot be intuitively and clearly understood through a visualization method.

[0006] An embodiment of the present invention provides a method for visualizing the flow of CO2 in a closed mine, comprising the following steps: determining the location of a monitoring well for monitoring the CO2 concentration in the closed mine, and extracting the CO2 concentration data detected at the location of the monitoring well at a certain moment; predicting the CO2 concentration of a surrounding area where no monitoring wells are set based on the CO2 concentration data at the determined location of the monitoring well, using a bilinear interpolation method, to obtain a predicted CO2 concentration matrix; generating a CO2 concentration heat map using a heat map function in a data visualization tool for the CO2 concentration matrix; splicing the CO2 concentration heat maps generated by the CO2 concentration data sets at multiple consecutive moments, and analyzing the CO2 flow based on the spliced ​​heat maps.

[0007] Furthermore, the step of obtaining the predicted CO2 concentration matrix specifically includes: adjusting the accuracy of the bilinear interpolation algorithm according to the spacing between the CO2 monitoring wells, and if the spacing between the two monitoring wells is large, improving the accuracy of the bilinear interpolation;

[0008] The bilinear interpolation method is formulated as follows:

[0009]

[0010] In the formula: A 11 , A 12 , A 21 and A 22 For the four adjacent monitoring wells, A11 The coordinate value is (x1, y1), A 12 The coordinate value is (x1, y2), A 21 The coordinate value is (x2, y1), A 22 The coordinate value is (x2, y2), f(A 11 )、f(A 12 )、f(A 21 ) and f(A 22 ) are the CO2 concentrations in the underground space measured by four adjacent monitoring wells, x and y are the horizontal and vertical coordinates of the prediction point, and f(x,y) is the predicted value of the CO2 concentration in the underground space at the prediction point.

[0011] Furthermore, the generating of the CO2 concentration heat map specifically includes: using the Matplotlib library, Seaborn library, Plotly library, geographic information system QGIS or geographic information system ArcGIS programmed in Python to generate the CO2 concentration heat map for the CO2 concentration matrix.

[0012] Furthermore, the CO2 flow is analyzed based on the spliced ​​thermal map, and the specific steps include: performing image preprocessing on the spliced ​​thermal map, using Gaussian filtering to remove image noise, and ensuring that each image corresponds to the measuring point position one by one; performing differential image analysis on the preprocessed image to identify the CO2 flow area; binarizing the differential image to highlight the change area; using the centroid method to obtain the center of mass position of the change area, infer the direction of CO2 flow, and obtain the change rate of the center of mass position to estimate the CO2 flow rate.

[0013] The embodiment of the present invention provides a device for visualizing the flow of CO2 in a closed mine, comprising:

[0014] The data acquisition module is used to determine the location of the monitoring well used to monitor the CO2 concentration in the closed mine, and to extract the CO2 concentration data detected at the monitoring well location at a certain moment; the heat map generation module is used to predict the CO2 concentration in the surrounding area without monitoring wells based on the CO2 concentration data of the determined monitoring well location, using the bilinear interpolation method, and obtain the predicted CO2 concentration matrix; the CO2 concentration matrix is ​​used to use the heat map function in the data visualization tool to generate a CO2 concentration heat map; the flow analysis module is used to splice the CO2 concentration heat maps generated by the CO2 concentration data sets at multiple consecutive moments, and analyze the CO2 flow based on the spliced ​​heat maps.

[0015] An embodiment of the present invention provides a computer device, comprising: a memory and a processor; the memory stores a computer program, and the processor implements the above-mentioned method for visualizing the flow of CO2 in a closed mine when executing the computer program.

[0016] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for visualizing the flow of CO2 in a closed mine as described above is implemented.

[0017] The embodiments of the present invention provide a method, device, equipment and medium for visualizing the flow of CO2 in a closed mine. Compared with the prior art, the advantageous effects thereof are as follows:

[0018] Based on the CO2 concentration data at the determined monitoring well locations, the bilinear interpolation method is used to predict the CO2 concentration in the surrounding areas where no monitoring wells are set up to obtain the predicted CO2 concentration matrix. The heat map function in the data visualization tool is used for the CO2 concentration matrix to generate a CO2 concentration heat map. The CO2 concentration heat maps generated by the CO2 concentration data sets at multiple consecutive moments are spliced, and the CO2 flow is analyzed based on the spliced ​​heat maps.

[0019] Among them, the heat map function in the data visualization tool is used for the CO2 concentration matrix to generate a CO2 concentration heat map, realizing the visualization of CO2 concentration. Then the CO2 concentration heat maps generated by the CO2 concentration data sets at multiple consecutive moments are spliced. The spliced ​​heat map can be used to visually analyze the flow state of CO2, and finally the effect of CO2 flow can be intuitively perceived through visualization. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the location of monitoring wells for a method for visualizing the flow of CO2 in a closed mine provided by an embodiment of the present invention;

[0021] Figure 2 A gas concentration matrix diagram generated by a bilinear interpolation method for a method for visualizing CO2 flow in a closed mine provided by an embodiment of the present invention;

[0022] Figure 3 A thermodynamic map of gas concentration in the underground space of the mine obtained according to array 1 provided in an embodiment of the present invention;

[0023] Figure 4 A thermal map of the gas concentration in the underground space of the mine obtained according to array 2 provided in an embodiment of the present invention;

[0024] Figure 5 A thermodynamic map of gas concentration in the underground space of the mine obtained according to array 3 provided in an embodiment of the present invention;

[0025] Figure 6 The thermal map of the gas concentration in the underground space of the mine obtained according to array 4 is provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0027] See also Figure 1 to Figure 6 The embodiment of the present invention provides a method for visualizing the flow of CO2 in a closed mine, comprising the following steps:

[0028] Step 1: Based on the location of the abandoned mine field, according to the monitoring accuracy requirements, field boundaries, and field scope, select CO2 monitoring wells as control points to form a layout plan for the CO2 concentration monitoring network in the underground space of closed coal mines. Among them, the monitoring wells are arranged in a rectangular shape, and the impact of ground structures on the construction of drilling monitoring wells should be fully considered during the layout. The monitoring wells should monitor the CO2 concentration in the underground space of the coal mine within the maximum range, that is, the rectangle formed by the monitoring network should be the largest rectangle obtained within the field. Furthermore, when the scope of the monitoring network is less than 50% of the field area, the mine can be divided into several areas, and the monitoring network can be arranged separately in each area.

[0029] Step 2: Drill monitoring wells at corresponding locations in the well field according to the monitoring network layout plan.

[0030] Step 3: Extract the data set of the monitoring network logging at a certain moment that can characterize the CO2 concentration in the underground space.

[0031] Step 4: Analyze the data set through the bilinear interpolation calculation method to predict CO2 concentration and generate a CO2 concentration matrix. The accuracy of the bilinear interpolation algorithm is adjusted according to the spacing between the monitoring wells. If the spacing between the two monitoring wells is large, the calculation accuracy of the bilinear interpolation can be improved.

[0032] The mathematical calculation principle of bilinear interpolation is as follows:

[0033]

[0034] Among them, A 11 , A 12 , A 21 and A 22 For the four adjacent monitoring wells, A 11 The coordinate value is (x1, y1), A 12 The coordinate value is (x1, y2), A 21 The coordinate value is (x2, y1), A 22 The coordinate value is (x2, y2), f(A11 )、f(A 12 )、f(A 21 ) and f(A 22 ) are the CO2 concentrations in the underground space measured by four adjacent monitoring wells, x and y are the horizontal and vertical coordinates of the prediction point, and f(x,y) is the predicted value of the CO2 concentration in the underground space at the prediction point.

[0035]

[0036] Step 5: Visualize the CO2 concentration matrix and generate a CO2 concentration heat map.

[0037] Step 6: Generate a CO2 concentration heat map based on the frequency of monitoring well data collection, and analyze the CO2 flow pattern after it is continuous.

[0038] The embodiment of the present invention provides a device for visualizing the flow of CO2 in a closed mine, comprising:

[0039] The data acquisition module is used to determine the location of the monitoring well used to monitor the CO2 concentration in the closed mine, and to extract the CO2 concentration data detected at the monitoring well location at a certain moment. The heat map generation module is used to predict the CO2 concentration in the surrounding area without monitoring wells based on the CO2 concentration data at the determined monitoring well location, using the bilinear interpolation method to obtain the predicted CO2 concentration matrix; the CO2 concentration matrix is ​​used to use the heat map function in the data visualization tool to generate a CO2 concentration heat map. The flow analysis module is used to splice the CO2 concentration heat maps generated by the CO2 concentration data sets at multiple consecutive moments, and analyze the CO2 flow based on the spliced ​​heat maps.

[0040] An embodiment of the present invention provides a computer device, including: a memory and a processor; the memory stores a computer program, and when the processor executes the computer program, the steps of a method for visualizing the flow of CO2 in a closed mine are implemented.

[0041] An embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the computer program implements the steps of a method for visualizing the flow of CO2 in a closed mine.

[0042] A specific embodiment is as follows:

[0043] Step 1. Based on the location of the abandoned mine field, according to the monitoring accuracy requirements, field boundaries, and field scope, select CO2 monitoring wells as control points to form a layout plan for the CO2 concentration monitoring network in the underground space of closed coal mines.

[0044] In step 1, a mine in Heilongjiang was selected as the research site. The mining area is 29.5026 square kilometers. 11*13=143 monitoring wells were initially arranged, and the spacing between logging wells is 400m*400m. The monitoring density of this mining area is 1 CO2 monitoring well per 0.206 square kilometers.

[0045] Step 2. Drill monitoring wells at corresponding locations in the well field according to the monitoring network layout plan

[0046] Step 3. Capture the data set of the monitoring network logging at four times on a certain day that can characterize the CO2 concentration in the underground space

[0047] In step 3, the data set is presented in matrix form, and the specific data is as follows:

[0048] Array 1:

[0049]

[0050] Array 2:

[0051]

[0052] Array 3:

[0053]

[0054] Array 4:

[0055]

[0056] Step 4: Substitute the above data into the MATLAB calculation program to obtain the thermal map of CO2 concentration in the underground space of the mine at four different times on a certain day.

[0057] Step 5: The flow trend of CO2 in the underground space of the coal mine can be obtained by splicing the thermal map obtained in step 4.

[0058] The MATLAB code of this embodiment is as follows, taking array 1 as an example:

[0059]

[0060]

[0061]

[0062] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for visualizing the flow of CO2 in a closed mine, characterized in that: The following steps are involved: Determine the location of the monitoring well used to monitor the CO2 concentration in the closed mine, and extract the CO2 concentration data detected at the monitoring well location at a certain moment; Based on the CO2 concentration data at the determined monitoring well locations, the bilinear interpolation method is used to predict the CO2 concentration in the surrounding areas where no monitoring wells are set up, and the predicted CO2 concentration matrix is ​​obtained; the heat map function in the data visualization tool is used for the CO2 concentration matrix to generate a CO2 concentration heat map; The CO2 concentration heat maps generated by CO2 concentration data sets at multiple consecutive moments are spliced ​​together, and the CO2 flow is analyzed based on the spliced ​​heat maps.

2. A method for visualizing CO2 flow in a closed mine as claimed in claim 1, characterized in that: The specific steps of obtaining the predicted CO2 concentration matrix include: Adjust the accuracy of the bilinear interpolation algorithm according to the spacing between CO2 monitoring wells. If the spacing between two monitoring wells is large, the accuracy of the bilinear interpolation is improved. The bilinear interpolation method, the matrix expression is: Among them, A 11 , A 12 , A 21 and A 22 For the four adjacent monitoring wells, A 11 The coordinate value is (x1, y1), A 12 The coordinate value is (x1, y2), A 21 The coordinate value is (x2, y1), A 22 The coordinate value is (x2, y2), f(A 11 )、f(A 12 )、f(A 21 ) and f(A 22 ) are the CO2 concentrations in the underground space measured by four adjacent monitoring wells, x and y are the horizontal and vertical coordinates of the prediction point, and f(x,y) is the predicted value of the CO2 concentration in the underground space at the prediction point.

3. A method for visualizing CO2 flow in a closed mine as claimed in claim 1, characterized in that: The generating of the CO2 concentration thermal map specifically includes: The CO2 concentration matrix is ​​programmed using Python's Matplotlib library, Seaborn library, Plotly library, QGIS geographic information system, or ArcGIS geographic information system to generate a CO2 concentration heat map.

4. A method for visualizing CO2 flow in a closed mine as claimed in claim 1, characterized in that: The specific steps of analyzing the CO2 flow according to the spliced ​​thermal map include: The spliced ​​thermal images were preprocessed and Gaussian filtering was used to remove image noise to ensure that each image corresponded to the measurement point position. Perform differential image analysis on the preprocessed images to identify the CO2 flow area; Binarize the difference image to highlight the changed area; The centroid method is used to obtain the centroid position of the change area, infer the direction of CO2 flow, and obtain the change rate of the centroid position to estimate the CO2 flow rate.

5. A device for visualizing the flow of CO2 in a closed mine, characterized in that: include: A data acquisition module is used to determine the location of a monitoring well for monitoring CO2 concentration in a closed mine, and to extract the CO2 concentration data detected at the location of the monitoring well at a certain moment; The heat map generation module is used to predict the CO2 concentration in the surrounding area without monitoring wells using the bilinear interpolation method based on the CO2 concentration data at the determined monitoring well location, and obtain the predicted CO2 concentration matrix; the heat map function in the data visualization tool is used for the CO2 concentration matrix to generate a CO2 concentration heat map; The flow analysis module is used to splice the CO2 concentration heat maps generated by the CO2 concentration data sets at multiple consecutive moments, and analyze the CO2 flow based on the spliced ​​heat maps.

6. A computer device comprising: Memory and processor; The memory stores a computer program, wherein the processor implements a method for visualizing the flow of CO2 in a closed mine as described in any one of claims 1 to 4 when executing the computer program.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, a method for visualizing the flow of CO2 in a closed mine as described in any one of claims 1 to 4 is implemented.

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