Heat measurement device and method for simulating high-flow-rate pressure grouting whole process of mining material

Abstract

A heat measurement device and method for simulating a high-flow-rate pressure grouting whole process of a mining material. The heat measurement device for simulating a high-flow-rate pressure grouting whole process of a mining material comprises a thermal insulation tank (1), a coal sample tank (2), a pressure grouting cavity (3), a side temperature sensor (4), and a bottom temperature sensor (7). The heat measurement method for simulating a high-flow-rate pressure grouting whole process of a mining material comprises: checking the air tightness of the thermal insulation tank (1), the coal sample tank (2), the pressure grouting cavity (3) and a connecting pipeline, and measuring the temperature; loading a coal sample into the coal sample tank (2); presetting grouting data; starting an external material supply unit, and carrying out pressure grouting construction; collecting data; and turning off an apparatus and cleaning the apparatus. In the present device, a coal sample is loaded in the thermal insulation tank (1) to simulate a coal seam environment, the pressure grouting cavity (3) is reserved in the middle of the coal sample, and a mining material is injected into the pressure grouting cavity (3) by means of the external material supply unit to simulate an underground filling construction process.

Description

A heat testing device and method for simulating the entire process of high-flow injection of mining materials Technical Field

[0001] The invention belongs to the technical field of mining material experimental equipment, and in particular provides a device and method for simulating the whole process of high-flow pressure injection of mining materials. Background Art

[0002] In recent years, mining material plugging and filling technology has been widely used in my country, greatly improving the production conditions of mines. Its main application areas include filling various abandoned tunnels, chambers, coal chutes, cavities, and sealing of air leakage channels. Usually, the filling plan requires the application of two or more mining materials. During the filling process, different mining materials are injected into the target area respectively. The different mining materials will react and solidify in the target area, releasing heat during the reaction. However, the thermal conductivity of mining materials themselves is poor, and heat often accumulates, resulting in high temperature points. High temperature not only affects the performance of the material itself, but also has an impact on the surrounding coal body.

[0003] At present, most research focuses on the heat generation performance of the material itself, and does not involve the impact of the spontaneous combustion state of the surrounding coal body during the material injection process, especially when it comes to underground coal mines. It is impossible to simulate the impact of the heat generated during the large-flow injection of mining materials on the surrounding coal body, and thus it is impossible to realize the detection of heat during the filling process under different conditions (flow rate, ratio, etc.).

[0004] Therefore, how to study and test the impact of different grouting speeds, different mining materials, different cavity volumes, different surrounding environments and other conditions on the exothermic process, as well as the stress and strain changes of the material on the surrounding coal body after the filling and injection are completed, is a topic that the coal mining industry urgently needs to study.

[0005] Summary of the Invention

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a heat testing device for simulating the whole process of large-flow pressure injection of mining materials, comprising a heat preservation tank, a coal sample tank, a pressure injection chamber, a side temperature sensor and a bottom temperature sensor, the coal sample tank being assembled inside the heat preservation tank, the pressure injection chamber being arranged inside the coal sample tank, a plurality of side temperature sensors being arranged on the side wall of the coal sample tank, the plurality of side temperature sensors being connected to an external computer system, a material delivery pipe being inserted into the coal sample tank, one end of the material delivery pipe extending into the pressure injection chamber, the other end of the material delivery pipe penetrating the heat preservation tank and the coal sample tank extending to the outside, and being connected to an external material supply unit;

[0007] The bottom temperature sensor passes through the heat preservation tank and the coal sample tank and extends into the injection cavity.

[0008] Furthermore, an optical fiber sensor is embedded in the inner wall of the injection cavity in a surrounding manner.

[0009] Furthermore, a pressure sensor is provided in the injection cavity.

[0010] Furthermore, a pressure relief valve is provided on the outside of the heat preservation tank, and the pressure relief valve is connected to the injection chamber through a pipeline.

[0011] Furthermore, the multiple side temperature sensors are evenly divided into two sensor groups, and the two sensor groups are symmetrically distributed on both sides of the coal sample tank. The several side temperature sensors in each sensor group are arranged vertically, and the several side temperature sensors in each sensor group have different lengths.

[0012] Furthermore, the coal sample tank is separated from the injection cavity by a mesh isolation structure.

[0013] Furthermore, the two sensor groups are arranged in a stepped or inverse stepped shape.

[0014] A heat testing method for simulating the entire process of high-flow injection of mining materials, the specific steps are as follows:

[0015] Step 1: Check the air tightness of the insulation tank, coal sample tank, injection chamber and connecting pipes, and check the temperature sensor;

[0016] Step 2: Fill the coal sample into the coal sample tank, start the external material supply unit, and fill the experimental material into the injection chamber;

[0017] Step 3: Preset grouting data;

[0018] According to the test requirements, the pressure, flow rate and grouting time required for the material to be injected into the injection cavity are set through the external computer system;

[0019] Step 4: Start the external material supply unit and carry out injection molding;

[0020] The external material supply unit injects the mining material into the injection cavity according to the value set in step 3;

[0021] Step 5: Data collection;

[0022] During the injection process, multiple side temperature sensors collect temperature change data of coal samples at multiple points, optical fiber sensors collect stress change data of mining materials on the surrounding coal body during injection, and bottom temperature sensors collect temperature change data in the injection cavity.

[0023] Step 6: Turn off the device and clean it up.

[0024] The beneficial effects of using the present invention are:

[0025] This equipment simulates the coal seam environment by filling the coal sample inside the insulation tank, and reserves a pressure injection cavity in the middle of the coal sample. Mining materials are injected into the pressure injection cavity through an external material supply unit to simulate the underground filling construction process.

[0026] The temperature change of the coal body around the injection cavity during the filling process is monitored by the side temperature sensor;

[0027] The temperature change of the mining material inside the injection cavity during the filling process is monitored by the bottom temperature sensor;

[0028] The deformation process of the coal body around the injection cavity during the filling process is monitored by optical fiber sensors;

[0029] By integrating the above data, we can analyze the performance of mining materials and the impact of the mining material injection process on the surrounding coal body, and fully understand the filling effect and construction risks of mining materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a schematic structural diagram of the present invention;

[0031] FIG2 is a system control relationship diagram of the present invention;

[0032] The reference numerals include: 1. insulation tank; 2. coal sample tank; 3. injection chamber; 4. side temperature sensor; 5. optical fiber sensor; 6. feed pipe; 7. bottom temperature sensor; 8. pressure relief valve. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] 1 , a heat test device for simulating the whole process of high-flow pressure injection of mining materials comprises an insulation tank 1, a coal sample tank 2, a pressure injection chamber 3, a side temperature sensor 4 and a bottom temperature sensor 7. The coal sample tank 2 is assembled inside the insulation tank 1, the pressure injection chamber 3 is arranged in the coal sample tank 2, a plurality of side temperature sensors 4 are arranged on the side wall of the coal sample tank 2, and the plurality of side temperature sensors 4 are connected to an external computer system. A material delivery pipe 6 is inserted into the coal sample tank 2, one end of the material delivery pipe 6 extends into the pressure injection chamber 3, and the other end of the material delivery pipe 6 passes through the insulation tank 1 and the coal sample tank 2 and extends to the outside, and is connected to an external material supply unit.

[0036] The bottom temperature sensor 7 passes through the heat preservation tank 1 and the coal sample tank 2 and extends into the injection chamber 3 .

[0037] An optical fiber sensor 5 is embedded in the inner wall of the injection chamber 3. When the mining material contacts and squeezes the surrounding coal, the optical fiber sensor 5 can collect stress data to monitor the stress changes of the mining material on the surrounding coal during the injection process.

[0038] Preferably, the optical fiber sensor 5 uses a high-temperature resistant fiber Bragg grating as its sensor, which has the characteristics of small size and high sensitivity. There are multiple optical fiber sensors 5, and the multiple optical fiber sensors 5 are axially distributed outside the injection cavity 3 at equal intervals.

[0039] A pressure sensor is also provided in the injection cavity 3 .

[0040] A pressure relief valve 8 is provided on the outside of the heat preservation tank 1 , and the pressure relief valve 8 is connected to the injection chamber 3 through a pipeline.

[0041] 2 , each sensor and material supply unit is controlled by an external computer. The external computer system is used to collect feedback data from each sensor and control the external material supply unit by inputting preset values.

[0042] The material delivery pipe 6 is equipped with a high-precision flow meter, which is used to monitor the flow rate and speed of the material with an error of ±0.5%.

[0043] Preferably, the coal sample tank 2 and the injection chamber 3 are separated by a mesh isolation structure;

[0044] The mesh isolation structure is made of corrosion-resistant and high-temperature resistant filamentary materials. The diameter of the filamentary materials is 5mm, and the mesh aperture of the mesh isolation structure is 2mm. It is formed into a cylindrical shape with a radius of 0.6m to 1m and a height of 1m, which can hold 2t of mining materials.

[0045] The wire mesh can change the respective volumes of the injection cavity and the coal sample tank by adjusting the radius.

[0046] Preferably, the side temperature sensors 4 are radially inserted into the coal sample tank 2 , and the detection ends of the side temperature sensors 4 are located inside the coal sample tank 2 .

[0047] Preferably, the side temperature sensor 4 is of armored pt100 type.

[0048] Example 2

[0049] Compared with the first embodiment, the difference of this embodiment is:

[0050] The multiple side temperature sensors 4 are evenly divided into two sensor groups. The two sensor groups are symmetrically distributed on both sides of the coal sample tank 2. The multiple side temperature sensors 4 in each sensor group are arranged vertically, and the multiple side temperature sensors 4 in each sensor group are of different lengths.

[0051] The two sensor groups are arranged in a stepped or reverse stepped shape. The stepped shape is that several side temperature sensors 4 are arranged from top to bottom in order of length from short to long, while the reverse stepped shape is that several side temperature sensors 4 are arranged from top to bottom in order of length from long to short.

[0052] Taking continuous sampling of the temperature changes of the coal body at multiple points will help analyze the impact of the entire injection construction process on the coal body.

[0053] Example 3

[0054] A method for simulating the heat of a mining material during a high-flow pressure injection process is provided, wherein the heat testing device for simulating the heat of a mining material during a high-flow pressure injection process of any one of the first and second embodiments is used. The specific steps are as follows:

[0055] Step 1: Check the air tightness of the insulation tank 1, coal sample tank 2, injection chamber 3 and connecting pipelines, and check the side temperature sensor 4 and bottom temperature sensor 7;

[0056] Step 2: Set the mesh aperture of the mesh isolation structure, load the coal sample into the coal sample tank 2, start the external material supply unit, and load the experimental material into the injection cavity 3;

[0057] Step 3: Preset grouting data;

[0058] According to the test requirements, the pressure, flow rate and grouting time required for the material to be injected into the injection cavity 3 are set through the external computer system;

[0059] Step 4: Start the external material supply unit and carry out injection molding;

[0060] The external material supply unit injects the mining material into the injection cavity 3 according to the value set in step 3;

[0061] Step 5: Data collection;

[0062] During the injection process, multiple side temperature sensors 4 collect temperature change data of coal samples at multiple points, the optical fiber sensor 5 collects stress change data of the mining material on the surrounding coal body during the injection process, and the bottom temperature sensor 7 collects temperature change data in the injection cavity 3;

[0063] Step 6: Turn off the device and clean it up.

[0064] The above content is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the concept of the present invention, many changes can be made in the specific implementation method and application scope. As long as these changes do not deviate from the concept of the present invention, they all fall within the scope of protection of the present invention.

Claims

1. A thermal testing device for simulating the entire process of high-flow injection of mining materials, characterized by: It includes an insulation tank, a coal sample tank, a pressure injection chamber, a side temperature sensor and a bottom temperature sensor. The coal sample tank is assembled inside the insulation tank, the pressure injection chamber is arranged in the coal sample tank, a plurality of side temperature sensors are arranged on the side wall of the coal sample tank, and the plurality of side temperature sensors are connected to an external computer system. A material delivery pipe is inserted into the coal sample tank, one end of the material delivery pipe extends into the pressure injection chamber, and the other end of the material delivery pipe passes through the insulation tank and the coal sample tank and extends to the outside and is connected to an external material supply unit. The bottom temperature sensor passes through the heat preservation tank and the coal sample tank and extends into the injection cavity.

2. A thermal testing device for simulating the entire process of high-flow injection of mining materials according to claim 1, characterized in that: An optical fiber sensor is embedded in the inner wall of the injection cavity in a surrounding manner.

3. A thermal testing device for simulating the entire process of high-flow injection of mining materials according to claim 1, characterized in that: A pressure sensor is also provided in the injection cavity.

4. A thermal testing device for simulating the entire process of high-flow injection of mining materials according to claim 1, characterized in that: A pressure relief valve is provided on the outside of the heat preservation tank, and the pressure relief valve is connected with the injection cavity through a pipeline.

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

6. A thermal testing device 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 cavity are separated by a mesh isolation structure.

7. The device for simulating the whole process of high-flow injection of mining materials according to claim 5, characterized in that: The two sensor groups are arranged in a stepped or inverse stepped shape.

8. A method for simulating the heat test of the entire process of high-flow injection of mining materials, the specific steps are as follows: Step 1: Check the air tightness of the insulation tank, coal sample tank, injection chamber and connecting pipes, and check the temperature sensor; Step 2: Fill the coal sample into the coal sample tank, start the external material supply unit, and fill the experimental material into the injection chamber; Step 3: Preset grouting data; According to the test requirements, the pressure, flow rate and grouting time required for the material to be injected into the injection cavity are set through the external computer system; Step 4: Start the external material supply unit and carry out injection molding; The external material supply unit injects the mining material into the injection cavity according to the value set in step 3; Step 5: Data collection; During the injection process, multiple side temperature sensors collect temperature change data of coal samples at multiple points, optical fiber sensors collect stress change data of mining materials on the surrounding coal body during injection, and bottom temperature sensors collect temperature change data in the injection cavity. Step 6: Turn off the device and clean it up.

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