A geometric method for quickly locating the high-temperature area of ​​spontaneous combustion of coal in goaf

Abstract

The present invention discloses a geometric method for quickly locating a high-temperature area of ​​spontaneous combustion of coal in a goaf, which comprises the following steps: Step 1: First, a plurality of temperature measuring boreholes are constructed in parallel to the coal mining working face in the oxidation zone of the goaf, and two temperature measuring points with the same temperature are determined, which are respectively recorded as point A and point B; Step 2: A plurality of same-layer boreholes are constructed on the mid-vertical line between the two temperature measuring points A and B, and a temperature measuring point with the same temperature as the two temperature measuring points A and B is found, which is recorded as point C. The beneficial effect is that the present invention obtains a temperature distribution map of the isothermal layer of the goaf of a coal mine based on a geometric method, can quickly determine the distribution of the high-temperature area of ​​spontaneous combustion of coal in the goaf, and realizes the accurate division of the dangerous area of ​​spontaneous combustion of coal, which is conducive to the treatment of spontaneous combustion disasters of coal and ensures the safe production of coal mines.

Description

Technical Field

[0001] The invention relates to the technical field of prevention and control of spontaneous combustion disasters of coal in goaf areas, and in particular to a geometric method for quickly locating a spontaneous combustion high-temperature area of ​​coal in goaf areas. Background Art

[0002] Coal spontaneous combustion is the external manifestation of the physical and chemical reaction between coal and oxygen. The oxidation reaction generates heat, which accumulates in the goaf and forms a high-temperature area. In order to better prevent and control coal spontaneous combustion, it is necessary to determine the distribution of high-temperature areas in the goaf, and then accurately control the coal spontaneous combustion disaster.

[0003] Research shows that the morphological distribution of isothermal surfaces in goaf areas has certain regularity: the temperature transfer rate in the lateral direction is uniform, and each isotherm can be regarded as a concentric circle; and under the action of hot wind pressure, the longitudinal temperature transfer rate is greater than the lateral temperature transfer rate, so the longitudinal isotherm is approximately an ellipse; and the patent number CN112268925A discloses a method for inverting the position of heat sources in high-temperature areas of goaf areas in coal mines, which regards the isothermal surface as a sphere, which is obviously not in line with engineering practice.

[0004] Therefore, in view of the above problems, it is necessary to propose a more reasonable and effective method to quickly and accurately determine the high-temperature area of ​​spontaneous combustion of coal in the goaf to ensure the safe production of coal mines. Summary of the invention

[0005] The purpose of the present invention is to provide a geometric method for quickly locating the high-temperature area of ​​spontaneous combustion of coal in goaf in order to solve the above-mentioned problem.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A geometric method for quickly locating a high-temperature area of ​​spontaneous combustion of coal in a goaf, comprising the following steps:

[0008] Step 1: First, construct several temperature measuring boreholes parallel to the coal mining face in the oxidation zone of the goaf, and determine two temperature measuring points with the same temperature, which are recorded as point A and point B respectively;

[0009] Step 2: Drill several holes in the same layer on the mid-vertical line between the two temperature measuring points A and B, and find the temperature measuring point with the same temperature as the two temperature measuring points A and B, which is recorded as point C;

[0010] Step 3: Draw a circumscribed circle of ΔABC, denoted as ⊙O1, with the center of the circle and the high temperature point on the same vertical line;

[0011] Step 4: Use the same method to find the center of the circle at different levels, such as ⊙O2, ⊙O3, ⊙On, and determine the temperature at each center;

[0012] Step 5: The high temperature area can be quickly located based on the temperature distribution of the center point.

[0013] Furthermore, points A and B in step 1 are located on the same isothermal surface.

[0014] Furthermore, ΔABC in step 3 is an isosceles triangle.

[0015] Furthermore, step 4 uses the temperature at the center of the circle to represent the temperature of each layer of the coal mine, thereby determining the temperature distribution diagram of each layer of the coal mine, and then realizing the rapid positioning of the high-temperature area of ​​spontaneous combustion of coal in the goaf. The drawing of this temperature distribution diagram is based on the distribution law of the isothermal surface morphology of the goaf, that is, the temperature transfer rate in the horizontal direction is uniform, and each isotherm can be regarded as a concentric circle; and under the action of the hot wind pressure, the longitudinal temperature transfer rate is greater than the lateral temperature transfer rate, so the longitudinal isotherm is approximately an ellipse.

[0016] The beneficial effects of the present invention are:

[0017] The present invention obtains the temperature distribution map of the isothermal layer of the coal mine goaf based on the geometric method, which can quickly determine the distribution of the high-temperature area of ​​coal spontaneous combustion in the goaf, and realize the accurate division of the coal spontaneous combustion danger area, which is beneficial to the control of coal spontaneous combustion disasters and ensure the safe production of coal mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of a geometric method for quickly locating a high-temperature area of ​​spontaneous combustion of coal in a goaf according to the present invention;

[0019] Figure 2 It is a three-dimensional distribution diagram of the isothermal surface of the goaf in the geometric method for quickly locating the high-temperature area of ​​spontaneous combustion of coal in the goaf described in the present invention;

[0020] Figure 3 It is a top view of the isothermal surface of the goaf in the geometric method for quickly locating the high-temperature area of ​​spontaneous combustion of coal in the goaf according to the present invention;

[0021] Figure 4 It is a front view of the isothermal surface of the goaf in the geometric method for quickly locating the high-temperature area of ​​spontaneous combustion of coal in the goaf according to the present invention;

[0022] Figure 5 This is a layout diagram of parallel temperature measurement lines in a goaf in a geometric method for quickly locating a high-temperature area of ​​spontaneous combustion of coal in a goaf described in the present invention. DETAILED DESCRIPTION

[0023] A geometric method for quickly locating a high-temperature area of ​​spontaneous combustion of coal in a goaf, comprising the following steps:

[0024] Step 1: First, construct several temperature measuring boreholes parallel to the coal mining face in the oxidation zone of the goaf, and determine two temperature measuring points with the same temperature, which are recorded as point A and point B respectively;

[0025] Step 2: Drill several holes in the same layer on the mid-vertical line between the two temperature measuring points A and B, and find the temperature measuring point with the same temperature as the two temperature measuring points A and B, which is recorded as point C;

[0026] Step 3: Draw a circumscribed circle of ΔABC, denoted as ⊙O1, with the center of the circle and the high temperature point on the same vertical line;

[0027] Step 4: Use the same method to find the center of the circle at different levels, such as ⊙O2, ⊙O3, ⊙On, and determine the temperature at each center;

[0028] Step 5: The high temperature area can be quickly located based on the temperature distribution of the center point.

[0029] In this embodiment, points A and B in step 1 are located on the same isothermal surface.

[0030] In this embodiment, ΔABC in step 3 is an isosceles triangle.

[0031] In this embodiment, step 4 uses the temperature at the center of the circle to represent the temperature of each layer of the coal mine, thereby determining the temperature distribution diagram of each layer of the coal mine, and then realizing the rapid positioning of the high-temperature area of ​​spontaneous combustion of coal in the goaf. The drawing of this temperature distribution diagram is based on the distribution law of the isothermal surface morphology of the goaf, that is, the temperature transfer rate in the horizontal direction is uniform, and each isotherm can be regarded as a concentric circle; and under the action of the hot wind pressure, the longitudinal temperature transfer rate is greater than the lateral temperature transfer rate, so the longitudinal isotherm is approximately an ellipse.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A geometric method for quickly locating the high-temperature area of ​​spontaneous combustion of coal in goaf, characterized by: It includes the following steps: Step 1: First, construct several temperature measuring boreholes parallel to the coal mining face in the oxidation zone of the goaf, and determine two temperature measuring points with the same temperature, which are recorded as point A and point B respectively; Step 2: Drill several holes in the same layer on the median vertical line between the two temperature measuring points A and B, and find the temperature measuring point with the same temperature as the two temperature measuring points A and B, which is recorded as point C; Step 3: Draw a circumscribed circle of ΔABC, denoted as ⊙O1, with the center of the circle and the high temperature point on the same vertical line; Step 4: Use the same method to find the center of the circle at different levels, such as ⊙O2, ⊙O3, ⊙On, and determine the temperature at each center; Step 5: The high temperature area can be quickly located based on the temperature distribution of the center point.

2. According to claim 1, a geometric method for quickly locating the high-temperature area of ​​spontaneous combustion of coal in goaf, characterized in that: Points A and B in step 1 are located on the same isothermal surface.

3. According to claim 1, a geometric method for quickly locating the high-temperature area of ​​spontaneous combustion of coal in goaf, characterized in that: ΔABC in step 3 is an isosceles triangle.

4. According to claim 1, a geometric method for quickly locating the high-temperature area of ​​spontaneous combustion of coal in goaf, characterized in that: The step 4 is to use the temperature at the center of the circle to represent the temperature of each layer in the goaf, so as to determine the temperature distribution diagram of each layer in the goaf, and then quickly locate the high-temperature area of ​​spontaneous combustion of coal in the goaf.

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