Thermal testing apparatus and method for simulating the entire process of high-flow injection of mining materials.

Abstract

The present invention belongs to the technical field of experimental apparatus for mining materials, and more particularly provides a thermal testing apparatus and method for simulating the entire process of high-flow injection of mining materials. The thermal testing apparatus for simulating the entire process of high-flow injection of mining materials includes a heat-insulating tank, a coal sample tank, an injection chamber, a side temperature sensor, and a bottom temperature sensor. The thermal testing method for simulating the entire process of high-flow injection of mining materials includes the steps of inspecting the airtightness and temperature of the heat-insulating tank, coal sample tank, injection chamber, and connecting pipeline; placing a coal sample in the coal sample tank; pre-setting grout injection data; activating an external material supply unit and performing injection; collecting data; and stopping the apparatus and cleaning the apparatus. This apparatus simulates the coal seam environment by placing a coal sample inside the heat-insulating tank, pre-installs an injection chamber in the center of the coal sample, and simulates the underground filling construction process by injecting mining materials into the injection chamber using an external material supply unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of experimental devices for mining materials, and particularly provides a thermal test device and method for simulating the entire process of large-flow pressure injection of mining materials.

Background Art

[0002] In recent years, the technology of preventing mud leakage and filling with mining materials has been widely applied in China, greatly improving the production conditions of mines. Its main application scope includes filling various abandoned mine shafts, chambers, coal chutes, caves, and blocking air leakage passages. Usually, it is necessary to use two or more types of mining materials. In the filling process, after injecting different mining materials into the target area respectively, the different mining materials react and harden in the target area, releasing heat in the reaction process. Since the thermal conductivity performance of the mining materials themselves is not good, heat continues to accumulate, and the problem of high-temperature sites often occurs. The high temperature not only affects the performance of the materials themselves but also affects the surrounding coal.

[0003] Currently, most research focuses on the heat generation performance of the materials themselves and does not consider the impact on the spontaneous combustion state of the surrounding coal during the pressure injection process. Especially in the case of coal mines, the heat generated during the large-flow pressure injection process of mining materials cannot be simulated, and the detection of heat under various conditions (flow rate, mixing ratio, etc.) during the filling process cannot be realized.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, how to study and measure the influence of the heat dissipation process and the change of the stress strain of the material on the surrounding coal after the filling pressure injection is completed under the conditions of various grout injection speeds, various mining materials, various cavity volumes, various surrounding environments, etc. is an urgent research topic in the coal mining industry.

Means for Solving the Problems

[0005] To solve the above technical problems, the technical solutions used in the present invention are as follows: A thermal testing apparatus for simulating the entire process of high-flow injection of mining materials, comprising a heat-insulating tank, a coal sample tank, an injection chamber, a side temperature sensor and a bottom temperature sensor, wherein the coal sample tank is assembled inside the heat-insulating tank, the injection chamber is provided inside the coal sample tank, a plurality of side temperature sensors are provided on the side wall of the coal sample tank, the plurality of side temperature sensors are connected to an external computer system, a material transport pipe is inserted inside the coal sample tank, one end of the material transport pipe extends into the injection chamber, and the other end of the material transport pipe extends outside through the heat-insulating tank and the coal sample tank and is connected to an external material supply unit. The bottom temperature sensor extends through the insulation tank and the coal sample tank into the pressurization chamber.

[0006] An optical fiber sensor is fitted in an annular manner into the inner wall of the press-fit chamber.

[0007] A pressure sensor is further provided within the press-fit chamber.

[0008] A relief valve is provided on the outside of the aforementioned heat-insulating tank, and the relief valve is connected to the pressurization chamber by a pipeline.

[0009] The multiple side temperature sensors are evenly divided into two sensor groups, and the two sensor groups are distributed symmetrically on both sides of the coal sample tank. The multiple side temperature sensors in each sensor group are arranged vertically, and the multiple side temperature sensors in each sensor group are of different lengths.

[0010] The coal sample tank and the injection chamber are separated using a mesh separation structure.

[0011] The two groups of sensors are arranged in a stepped or inverted stepped pattern, respectively.

[0012] A thermal testing method for simulating the entire process of high-flow injection of mining materials, specifically, Step 1 involves inspecting the airtightness of the insulation tank, coal sample tank, pressurization chamber, and connecting pipelines, and inspecting the temperature sensor. Step 2 involves placing the coal sample into the coal sample tank, activating the external material supply unit, and placing the experimental material into the pressurization chamber. Step 3 involves pre-setting grout injection data, such as setting the pressure, flow rate, and grout injection time required to inject the material into the press-in chamber using an external computer system, as needed for the test. Step 4 involves activating an external material supply unit to inject mining material into the press-fitting chamber based on the values ​​set in Step 3, and performing the press-fitting. In the injection process, multiple side temperature sensors collect temperature change data of the coal sample at multiple points, an optical fiber sensor collects data on the change in stress exerted by the mining material on the surrounding coal during the injection process, and a bottom temperature sensor collects temperature change data within the injection chamber. Step 5 involves data collection. This includes step 6, which involves stopping the device and cleaning the device. [Effects of the Invention]

[0013] The beneficial effects of using the present invention are as follows: This device simulates the coal seam environment by placing a coal sample inside a heat-insulating tank, pre-installs an injection chamber in the center of the coal sample, and simulates the underground filling construction process by injecting mining materials into the injection chamber using an external material supply unit. Side temperature sensors monitor the temperature changes of the coal around the injection chamber during the filling process. A bottom temperature sensor monitors the temperature changes of the mining material inside the injection chamber during the filling process. Optical fiber sensors are used to monitor the deformation process of coal around the injection chamber during the filling process. By compiling the above data, it is possible to analyze the performance of the mining material and its impact on the surrounding coal during the injection process, thereby gaining a comprehensive understanding of the filling effect of the mining material and the construction risks. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic diagram of the structure of the present invention. [Figure 2] This is a control relationship diagram of the system of the present invention.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, the present invention will be described in detail with reference to the drawings.

Examples

[0016] Referring to FIG. 1, a thermal test device for simulating the entire process of large-flow injection of mining materials includes a heat preservation tank 1, a coal sample tank 2, an injection chamber 3, side temperature sensors 4 and a bottom temperature sensor 7. The coal sample tank 2 is assembled inside the heat preservation tank 1. The injection chamber 3 is provided inside the coal sample tank 2. A plurality of side temperature sensors 4 are provided on the side wall of the coal sample tank 2. The plurality of side temperature sensors 4 are connected to an external computer system. A material transport pipe 6 is inserted into the coal sample tank 2. One end of the material transport pipe 6 extends into the injection chamber 3, and the other end of the material transport pipe 6 penetrates through the heat preservation tank 1 and the coal sample tank 2 and extends to the outside and is connected to an external material supply unit. The bottom temperature sensor 7 penetrates through the heat preservation tank 1 and the coal sample tank 2 and extends into the injection chamber 3.

[0017] An optical fiber sensor 5 is annularly embedded in the inner wall of the injection chamber 3. When the mining material contacts and presses against the surrounding coal, the optical fiber sensor 5 can collect stress data and is used to monitor the change rule of the corresponding stress exerted by the mining material on the surrounding coal during the injection process of the mining material.

[0018] Preferably, the optical fiber sensor 5 uses a high-temperature-resistant optical fiber Bragg grating as the sensor, has the characteristics of being small-sized and highly sensitive, the number of the optical fiber sensors 5 is plural, and the plural optical fiber sensors 5 are axially and equally spaced outside the injection chamber 3.

[0019] A pressure sensor is further provided in the press-fitting chamber 3.

[0020] A relief valve 8 is provided outside the heat preservation tank 1, and the relief valve 8 communicates with the press-fitting chamber 3 through a pipeline.

[0021] Referring to FIG. 2, each sensor and the material supply unit are all controlled by an external computer, and the external computer system is used to collect the feedback data of each sensor and control the external material supply unit by inputting a predetermined value.

[0022] A high-precision flow meter is attached to the material transport pipe 6, and the high-precision flow meter is used to monitor the flow rate and speed of the material, and the error is ±0.5%.

[0023] Preferably, the coal sample tank 2 and the press-fitting chamber 3 are partitioned by using a mesh separation structure. The mesh separation structure is woven using a corrosion-resistant and high-temperature-resistant filamentous material. The diameter of the filamentous material is 5 mm. The mesh separation structure has a mesh opening diameter of 2 mm. The mesh separation structure has a cylindrical shape with a radius of 0.6 m to 1 m and a height of 1 m, and can accommodate 2 t of mining materials. By adjusting the radius of the wire mesh, the volumes of the press-fitting chamber and the coal sample tank can be changed respectively.

[0024] Preferably, all the side temperature sensors 4 are inserted radially into the coal sample tank 2, and the detection ends of the side temperature sensors 4 are located inside the coal sample tank 2.

[0025] Preferably, the side temperature sensor 4 uses an external pt100 type.

Example

[0026] Compared with Example 1, this example has differences in the following points.

[0027] Multiple side temperature sensors 4 are evenly divided into two sensor groups, and the two sensor groups are distributed symmetrically on both sides of the coal sample tank 2. Multiple side temperature sensors 4 in each sensor group are arranged vertically, and multiple side temperature sensors 4 in each sensor group have different lengths.

[0028] The two sensor groups are arranged in a stepped or inverted stepped pattern, respectively. The stepped pattern refers to the arrangement of multiple side temperature sensors 4 from top to bottom in order of increasing length, while the inverted stepped pattern refers to the arrangement of multiple side temperature sensors 4 from top to bottom in order of increasing length. To monitor temperature changes in coal, it is common practice to continuously sample at multiple points, which is helpful in analyzing the impact of the entire injection process on the coal. [Examples]

[0029] The thermal test method for simulating the entire process of high-flow injection of mining materials uses a thermal test apparatus for simulating the entire process of high-flow injection of mining materials, either in Example 1 or Example 2. Specifically, Step 1 involves inspecting the airtightness of the insulated tank 1, coal sample tank 2, pressurization chamber 3, and connecting pipeline, and inspecting the side temperature sensor 4 and bottom temperature sensor 7. Step 2 involves setting the mesh opening diameter of the mesh separation structure, placing the coal sample into the coal sample tank 2, activating the external material supply unit, and placing the experimental material into the pressurization chamber 3. Step 3 involves pre-setting grout injection data, such as setting the pressure, flow rate, and grout injection time required to inject the material into the press-in chamber 3 using an external computer system, as needed for the test. Step 4 involves activating an external material supply unit to inject mining material into the press-fitting chamber 3 based on the values ​​set in Step 3, and performing the press-fitting. Step 5 involves collecting data during the injection process, where multiple side temperature sensors 4 collect multipoint temperature change data of the coal sample, an optical fiber sensor 5 collects data on the change in stress exerted by the mining material on the surrounding coal during the injection process, and a bottom temperature sensor 7 collects temperature change data within the injection chamber 3. This includes step 6, which involves stopping the device and cleaning the device.

[0030] The above description is merely a preferred embodiment of the present invention, and those skilled in the art can make many modifications to specific embodiments and applications based on the spirit of the present invention. All such modifications, as long as they do not deviate from the spirit of the present invention, fall within the scope of protection of the present invention. [Explanation of symbols]

[0031] 1. Insulated tank 2 Coal sample tank 3. Press-fit chamber 4. Side temperature sensor 5. Optical fiber sensor 6 Material transport pipe 7. Bottom temperature sensor 8. Relief valve

Claims

1. A thermal testing apparatus for simulating the entire process of high-flow injection of mining materials, The system includes a thermal insulation tank, a coal sample tank, a press-in chamber, side temperature sensors, and bottom temperature sensors. The coal sample tank is assembled inside the thermal insulation tank, the press-in chamber is located inside the coal sample tank, multiple side temperature sensors are provided on the side wall of the coal sample tank, the multiple side temperature sensors are connected to an external computer system, a material transport pipe is inserted into the coal sample tank, one end of the material transport pipe extends into the press-in chamber, and the other end of the material transport pipe extends outside through the thermal insulation tank and the coal sample tank and is connected to an external material supply unit. A thermal testing apparatus for simulating the entire process of high-flow injection of mining materials, characterized in that the bottom temperature sensor extends through the insulation tank and the coal sample tank into the injection chamber.

2. A thermal testing apparatus for simulating the entire process of high-flow injection of mining materials according to claim 1, characterized in that an optical fiber sensor is fitted in an annular manner into the inner wall of the injection chamber.

3. A thermal testing apparatus for simulating the entire process of high-flow injection of mining materials according to claim 1, characterized in that a pressure sensor is further provided in the injection chamber.

4. A thermal testing apparatus for simulating the entire process of high-flow injection of mining materials according to claim 1, characterized in that a relief valve is provided outside the heat-insulating tank, and the relief valve is connected to the injection chamber by a pipeline.

5. The thermal testing apparatus for simulating the entire process of high-flow injection of mining materials according to claim 1, characterized in that the multiple side temperature sensors are evenly divided into two sensor groups, the two sensor groups are distributed symmetrically on both sides of the coal sample tank, the multiple side temperature sensors in each sensor group are arranged vertically, and the multiple side temperature sensors in each sensor group are of different lengths.

6. The thermal testing apparatus for simulating the entire process of high-flow injection of mining materials according to claim 1, characterized in that the coal sample tank and the injection chamber are separated using a mesh separation structure.

7. The thermal testing apparatus for simulating the entire process of high-flow injection of mining materials according to claim 5, characterized in that the two groups of sensors are arranged in a stepped or inverted stepped pattern.

8. A thermal testing method for simulating the entire process of high-flow injection of mining materials, specifically, Step 1 involves inspecting the airtightness of the insulation tank, coal sample tank, pressurization chamber, and connecting pipeline, and inspecting the temperature sensor. Step 2 involves placing the coal sample into the coal sample tank, activating the external material supply unit, and placing the experimental material into the pressurization chamber. Step 3 involves pre-setting grout injection data, such as setting the pressure, flow rate, and grout injection time required to inject the material into the injection chamber using an external computer system, as needed for the test. Step 4 involves activating an external material supply unit to inject mining material into the press-fitting chamber based on the values ​​set in Step 3, and performing the press-fitting. In the injection process, multiple side temperature sensors collect temperature change data of the coal sample at multiple points, an optical fiber sensor collects data on the change in stress exerted by the mining material on the surrounding coal during the injection process, and a bottom temperature sensor collects temperature change data within the injection chamber. Step 5 involves data collection. A method comprising step 6 of stopping the device and cleaning the device.

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