Coal body high-temperature-gas time-air transportation characteristic measuring system based on matrix type programmed heating method

Abstract

The invention relates to the technical field of coal spontaneous combustion characteristic measurement, in particular to a coal body high-temperature-gas time-air transportation characteristic measurement system based on a matrix type programmed heating method, which comprises a gas source assembly, and the gas source assembly is respectively communicated with a gas supply assembly and a coal sample tank body through a three-way valve; a constant-temperature box is arranged outside the coal sample tank body, a baffle is arranged at the bottom in the coal sample tank body, a plurality of intelligent temperature control gas collection modules are arranged on the top surface of the baffle, the bottom of the coal sample tank body is communicated with a gas inlet, the gas inlet is communicated with a three-way valve, a coal sample tank cover is arranged on the top surface of the coal sample tank body, and the coal sample tank cover is communicated with a gas outlet and a temperature measurement output port. The gas outlet is communicated with a gas treatment tank, and the temperature measurement output port is connected with an analysis assembly. The coal body temperature rise process is accurately controlled through the constant temperature box, temperature data of different layers are collected through the intelligent temperature control gas collection module, specific gas collection and analysis means are adopted, and accurate measurement of coal body high-temperature-gas time-air transportation characteristics is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal spontaneous combustion characteristic measurement, and in particular to a coal body high temperature-gas space-time migration characteristic measurement system based on a matrix programmed temperature method. Background Art

[0002] During coal mining, transportation, and storage, spontaneous combustion poses a serious threat to production safety and efficient resource utilization. Spontaneous combustion occurs when coal reacts with oxygen in the air. As the reaction proceeds, the temperature of localized areas of the coal gradually rises, forming hot spots and generating a variety of gases. The temporal and spatial migration characteristics of these hot spots and the generated gases within the coal are crucial for determining the stage of spontaneous combustion, predicting its occurrence, and developing effective prevention and control measures.

[0003] Currently, the industry faces numerous challenges in determining high-temperature areas in coal and detecting gases at high-temperature points. Traditional detection methods often employ a single temperature measurement point arrangement, which can only obtain temperature information at a specific location within the coal. This method cannot fully reflect the temperature distribution within different regions within the coal, and it is even more difficult to track the evolution of high-temperature areas over time. In actual coal environments, high-temperature areas are not uniformly distributed, and their range, shape, and location are in dynamic change. Data from a single temperature measurement point cannot provide researchers with sufficient information to analyze the development trend of high-temperature areas, and thus cannot accurately predict the direction of coal spontaneous combustion.

[0004] Existing technologies also have significant shortcomings in detecting hot spot gases. The gases produced during coal oxidation are complex, containing carbon monoxide, carbon dioxide, methane, and other gases, and their concentrations vary with the temperature of the coal and the oxidation process. Existing detection methods are unable to accurately and timely capture changes in the composition and concentration of hot spot gases, making it difficult for researchers to gain a deeper understanding of the progress and intensity of coal oxidation reactions, and thus unable to provide robust data support for early warning and prevention of coal spontaneous combustion hazards.

[0005] Therefore, there is an urgent need for a coal high-temperature-gas spatiotemporal migration characteristic measurement system based on the matrix programmed temperature method. On the one hand, by measuring the temperature changes of the coal during the heating process, the thermal effect of coal oxidation and spontaneous combustion can be deeply studied, and the oxidation heat release law of the coal at different stages can be clarified, thereby providing key data for revealing the internal mechanism of coal spontaneous combustion; on the other hand, by detecting and analyzing the gas generated by the coal heating, the corresponding relationship between different gas components and coal temperature can be grasped, and then these relationships can be used to establish a reliable coal spontaneous combustion prediction model; through comprehensive analysis of the data, timely warning can be issued before the coal spontaneous combustion disaster occurs, which can gain precious time for taking effective prevention and control measures, minimize the loss of coal resources and ensure the safety of personnel lives. Summary of the Invention

[0006] The purpose of the present invention is to provide a coal high temperature-gas spatiotemporal migration characteristic measurement system based on a matrix programmed temperature method to solve the problems existing in the above-mentioned prior art.

[0007] To achieve the above-mentioned objectives, the present invention provides the following scheme: a coal high-temperature-gas spatiotemporal migration characteristic measurement system based on a matrix-type programmed temperature method, comprising a gas source component for providing nitrogen, the gas source component being connected to a gas supply component for providing air and a coal sample tank for placing coal through a three-way valve; a constant temperature box for heating the coal sample tank is provided outside the coal sample tank, a baffle is provided at the bottom inside the coal sample tank for uniformly distributing the gas, a plurality of intelligent temperature-controlled gas collection modules for monitoring the temperature at different heights in the coal sample tank and collecting the gas in the coal sample tank are provided on the top surface of the baffle, the bottom of the coal sample tank is connected to an air inlet, the air inlet is connected to the three-way valve, the top surface of the coal sample tank is provided with a coal sample tank cover, the coal sample tank cover is connected to an air outlet and a temperature measurement output port, the air outlet is connected to a gas treatment pool, and the temperature measurement output port is connected to an analysis component.

[0008] Preferably, the gas source assembly includes a nitrogen cylinder, and the gas outlet end of the nitrogen cylinder is connected to the three-way valve through a regulating valve.

[0009] Preferably, the air supply assembly includes a fully automatic air source, a pressure gauge and a pressure regulating knob are installed on the fully automatic air source, and the air outlet end of the fully automatic air source is connected to the three-way valve.

[0010] Preferably, a bracket for mounting the coal sample tank is fixedly connected to the lower portion of the constant temperature box, and a heating device for heating the coal sample tank is installed in the constant temperature box.

[0011] Preferably, the intelligent temperature-controlled gas collection module includes an adapter interface, in which a temperature data transmission line and an exhaust pipeline are provided, a plurality of temperature sensors are installed on one end of the temperature data transmission line extending from the adapter interface, a plurality of exhaust holes are provided on one end of the exhaust pipeline extending from the adapter interface, and the other end of the temperature data transmission line and the exhaust pipeline extending from the adapter interface passes through the temperature measurement output port and is connected to the analysis component.

[0012] Preferably, the plurality of temperature sensors and the plurality of air extraction holes are arranged at equal intervals and in one-to-one correspondence.

[0013] Preferably, the plurality of temperature sensors on the same horizontal plane form a single-layer temperature measurement area.

[0014] Preferably, the analysis component includes a computer, and the computer is connected to a temperature data collector and a gas analyzer.

[0015] Preferably, the temperature data collector is connected to an air pump through a linkage controller, the air outlet of the air pump is connected to the gas analyzer, the air inlet of the air pump is connected to a cooler, and the cooler is connected to the air extraction pipeline.

[0016] Preferably, the temperature data collector is connected to the temperature data transmission line.

[0017] The present invention discloses the following technical effects:

[0018] The present invention insulates the coal sample tank through a constant temperature box, effectively ensuring the temperature inside the coal sample tank; at the same time, through multiple intelligent temperature-controlled gas collection modules, it can obtain the temporal and spatial evolution temperature data inside the coal body in real time, multi-directionally and with high precision.

[0019] Compared with traditional measurement methods, the present invention can accurately monitor the location of high-temperature points in the coal body and the time required, greatly improving the accuracy and resolution of temperature measurement; at the same time, when high-temperature points are generated in the coal body, the gas spatiotemporal migration data is collected and analyzed in real time. Combined with the functions of the data processing terminal, the high-temperature-gas spatiotemporal migration characteristic parameters of the coal body are accurately monitored, and its internal laws are deeply revealed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the main structure of the coal sample tank of the present invention;

[0023] Figure 3 This is a schematic diagram of the top view of the coal sample tank of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the coal sample tank of the present invention;

[0025] Figure 5 This is a schematic diagram of the temperature measurement point distribution structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the intelligent temperature-controlled gas collection module of the present invention;

[0027] Among them: 1. Nitrogen cylinder; 2. Regulating valve; 3. Three-way valve; 4. Flow meter; 5. Pressure gauge; 6. Pressure regulating knob; 7. Fully automatic air source; 8. Constant temperature box; 9. Bracket; 10. Pipeline channel; 11. Coal sample tank; 12. Air inlet; 13. Air outlet; 14. Temperature measurement output port; 15. Coal sample tank cover; 16. Gas treatment pool; 17. Temperature data collector; 18. Interlocking controller; 19. Cooler; 20. Vacuum pump; 21. Gas analyzer; 22. Computer; 23. Fixing bolts; 24. Intelligent temperature-controlled gas collection module; 25. Single-layer temperature measurement area; 26. Temperature sensor; 27. Baffle; 28. Groove; 29. ​​Vacuum hole; 30. Adapter; 31. Temperature data transmission line; 32. Vacuum pipeline. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figure 1-Figure 5 The present invention provides a coal high temperature-gas space-time migration characteristic measurement system based on the matrix type programmed temperature method, comprising a gas source component for providing nitrogen, the gas source component being connected to a gas supply component for providing air and a coal sample tank 11 for placing coal through a three-way valve 3; a constant temperature box 8 for heating the coal sample tank 11 is provided outside the coal sample tank 11, a baffle 27 for uniformly distributing the gas is provided at the bottom of the coal sample tank 11, and a top surface of the baffle 27 is provided. Multiple intelligent temperature-controlled gas collection modules 24 are used to monitor the temperature at different heights in the coal sample tank 11 and collect the gas in the coal sample tank 11. The bottom of the coal sample tank 11 is connected to an air inlet 12, and the air inlet 12 is connected to the three-way valve 3. The top surface of the coal sample tank 11 is provided with a coal sample tank cover 15, and the coal sample tank cover 15 is connected to an air outlet 13 and a temperature measurement output port 14. The air outlet 13 is connected to a gas processing pool 16, and the temperature measurement output port 14 is connected to an analysis component.

[0031] Multiple intelligent temperature-controlled gas collection modules 24 are arranged in a matrix in the coal sample tank 11, so that the multiple intelligent temperature-controlled gas collection modules 24 can monitor the temperature data of different horizontal and vertical positions in the coal sample tank 11 and obtain the spatiotemporal migration trajectory of high-temperature points.

[0032] The gas outlet 13 is connected to a pipeline channel 10, and one end of the pipeline channel 10 away from the gas outlet 13 extends into a gas treatment pool 16. The gas discharged from the gas outlet 13 is treated by the gas treatment pool 16.

[0033] The coal sample tank body 11 is made of stainless steel, and the coal sample tank cover 15 is installed on the top surface of the coal sample tank body 11 through multiple fixing bolts 23, so that the interior of the coal sample tank body 11 is sealed to prevent gas leakage and ensure the accuracy of experimental data.

[0034] The present invention heats the coal sample tank 11 through the constant temperature box 8, effectively ensuring the temperature inside the coal sample tank 11; at the same time, through multiple intelligent temperature-controlled gas collection modules 24, the temporal and spatial evolution temperature data inside the coal body can be obtained in real time, multi-directionally and with high precision.

[0035] Compared with traditional measurement methods, the present invention can accurately monitor the location of high-temperature points in the coal body and the time required, greatly improving the accuracy and resolution of temperature measurement; at the same time, when high-temperature points are generated in the coal body, the gas spatiotemporal migration data is collected and analyzed in real time. Combined with the functions of the data processing terminal, the high-temperature-gas spatiotemporal migration characteristic parameters of the coal body are accurately monitored, and its internal laws are deeply revealed.

[0036] According to a further optimized solution, the gas source assembly includes a nitrogen cylinder 1, the gas outlet of which is connected to a three-way valve 3 via a regulating valve 2. Nitrogen is provided to the coal sample tank 11 via the nitrogen cylinder 1.

[0037] In a further optimized solution, the air supply assembly includes a fully automatic air source 7, which is equipped with a pressure gauge 5 and a pressure regulating knob 6. The air outlet of the fully automatic air source 7 is connected to the three-way valve 3. The coal sample tank 11 is provided with air through the fully automatic air source 7.

[0038] The present invention uses two gas sources, air and nitrogen, during the experiment. The nitrogen cylinder 1 provides a nitrogen atmosphere for the experiment, and the nitrogen pressure is controlled by the regulating valve 2; the fully automatic air source 7 provides a stable air flow for the oxidation reaction of the coal sample; the output pressure of the fully automatic air source 7 is adjusted by the pressure gauge 5 and the pressure regulating knob 6.

[0039] A flow meter 4 is installed on the pipeline between the three-way valve 3 and the air inlet 12, and the output flow rate is adjusted by the flow meter 4; the gas pipeline adopts a brass tube.

[0040] As a further optimization, a bracket 9 for mounting the coal sample tank 11 is fixedly connected to the lower portion of the thermostat 8, and a heating device for heating the coal sample tank 11 is installed in the thermostat 8. The heating device heats the coal sample tank 11 at a preset heating rate through a temperature control system.

[0041] The heating device and the temperature control system both adopt existing technologies and will not be described in detail here.

[0042] The bracket 9 facilitates the placement of the coal sample tank 11 , and the heating device heats the coal in the coal sample tank 11 .

[0043] In a further optimization scheme, the intelligent temperature-controlled gas collection module 24 includes an adapter 30, which houses a temperature data transmission line 31 and an exhaust pipeline 32. Multiple temperature sensors 26 are mounted on the end of the temperature data transmission line 31 extending from the adapter 30. Multiple exhaust holes 29 are defined on the end of the exhaust pipeline 32 extending from the adapter 30. The other ends of the temperature data transmission line 31 and the exhaust pipeline 32 extending from the adapter 30 extend through the temperature measurement output port 14 and connect to the analysis component. The temperature data transmission line 31 is mounted on the outer wall of the exhaust pipeline 32.

[0044] In order to facilitate the control of the air extraction holes 29 at different heights for air extraction, a solenoid valve is installed in each air extraction hole 29 .

[0045] The baffle 27 is provided with a plurality of grooves 28 , which are arranged in one-to-one correspondence with the exhaust pipes 32 . By inserting one end of the exhaust pipe 32 into the groove 28 , the installation of the exhaust pipe 32 is facilitated.

[0046] In a further optimized solution, the plurality of temperature sensors 26 and the plurality of air extraction holes 29 are arranged at equal intervals and in a one-to-one correspondence, so that the temperature sensors 26 and the air extraction holes 29 are on the same horizontal plane.

[0047] In a further optimized solution, multiple temperature sensors 26 on the same horizontal plane form a single-layer temperature measurement area 25. The single-layer temperature measurement areas 25 at different heights can comprehensively collect temperature data at different locations inside the coal body.

[0048] To further optimize the solution, the analysis component includes a computer 22, which is connected to a temperature data collector 17 and a gas analyzer 21. The temperature data collector 17 has a multi-channel acquisition function, capable of simultaneously collecting data from multiple temperature sensors 26; the temperature data collector 17 is equipped with a display screen that displays the corresponding relationship between the temperature measurement time and temperature in real time.

[0049] To further optimize the solution, the temperature data collector 17 is connected to the vacuum pump 20 through the linkage controller 18, the air outlet end of the vacuum pump 20 is connected to the gas analyzer 21, the air inlet end of the vacuum pump 20 is connected to the cooler 19, and the cooler 19 is connected to the vacuum pipeline 32.

[0050] The linkage controller 18 is electrically connected to the solenoid valve, and the opening and closing of the solenoid valve are controlled by the linkage controller 18 .

[0051] In a further optimized solution, the temperature data collector 17 is connected to the temperature data transmission line 31 .

[0052] When a high temperature point is displayed in the temperature data collector 17, the linkage controller 18 automatically controls the solenoid valve in the exhaust hole 29 at the corresponding position on the intelligent temperature-controlled gas collection module 24 to open, and the gas at the high temperature point is extracted through the exhaust pump 20, cooled through the cooler 19 through the exhaust pipeline 32, and finally transported to the gas analyzer 21 for analysis.

[0053] Working process: First, the coal sample is prepared into coal samples of different particle sizes according to the prescribed method, mixed and loaded into the coal sample tank 11, and the coal sample tank 11 containing the coal sample is placed on the bracket 9 in the constant temperature box 8, and the heating rate, target temperature and other parameters are set through the temperature control system; all pipelines are connected, and the gas flowmeter 4 is adjusted to control the appropriate flow parameters; the gas is transported from the pipeline to the air inlet 12 at the bottom of the coal sample tank 11 and then enters the coal sample tank 11. The gas is blown to the baffle 27 through the baffle 27 and then evenly dispersed to the surroundings, providing atmosphere for the coal sample reaction in the coal sample tank 11; multiple intelligent temperature-controlled gas collection modules 24 are arranged in a matrix and evenly distributed at different depths and positions in the coal sample tank 11. Multiple temperature sensors 26 at the same depth form a single-layer temperature measurement area 25. The single-layer temperature measurement areas 25 at different depths can fully collect temperature data at different positions inside the coal body.

[0054] The heating device is started to heat the coal sample tank 11 according to the set program. The intelligent temperature-controlled gas collection module 24 senses the temperature change of the coal body in real time and transmits the temperature signal to the temperature data collector 17. The temperature data collector 17 can monitor the position of the high-temperature point in the coal sample tank 11 in real time. When the high-temperature point does not appear during the heating process of the coal body, the electromagnetic valves in the air extraction holes 29 in the intelligent temperature-controlled gas collection module 24 are all closed, and the gas generated in the experiment enters the gas treatment pool 16 through the gas outlet pipe for treatment. When a high-temperature point appears, the temperature data collector 17 places the high-temperature point monitoring point at the same time. The signal is transmitted to the linkage controller 18, and the linkage controller 18 automatically controls to open the solenoid valve in the air extraction hole 29 at the high-temperature point, and the air extraction pump 20 starts to extract gas. That is, when the intelligent temperature-controlled gas collection module 24 detects that the temperature of a certain point has reached the high-temperature point, the solenoid valve in the air extraction hole 29 corresponding to the point is opened and air is extracted, and the solenoid valves in the other air extraction holes 29 remain closed; the extracted gas is cooled by the cooler 19 and then enters the gas analyzer 21; the gas analyzer 21 is used to perform component analysis and concentration detection on the collected gas, and the analysis results are transmitted to the computer 22.

[0055] Computer 22 combines temperature data and gas analysis data, performs comprehensive analysis through preset algorithms and models, draws temperature distribution curves, analyzes the temporal and spatial migration characteristics of high-temperature gas in the coal body, and provides data support for coal-related research and applications.

[0056] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0057] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A system for measuring the spatiotemporal migration characteristics of high-temperature coal gas based on a matrix-type programmed temperature method, characterized by: It comprises a gas source component for providing nitrogen, wherein the gas source component is connected to a gas supply component for providing air and a coal sample tank (11) for placing coal through a three-way valve (3); A constant temperature box (8) for heating the coal sample tank (11) is provided outside the coal sample tank (11); a baffle (27) for evenly distributing gas is provided at the bottom of the coal sample tank (11); a plurality of intelligent temperature-controlled gas collection modules (24) for monitoring temperatures at different heights in the coal sample tank (11) and collecting gas in the coal sample tank (11) are provided on the top surface of the baffle (27); an air inlet (12) is connected to the bottom of the coal sample tank (11); the air inlet (12) is connected to the three-way valve (3); a coal sample tank cover (15) is provided on the top surface of the coal sample tank (11); an air outlet (13) and a temperature measurement output port (14) are connected to the coal sample tank cover (15); the air outlet (13) is connected to a gas processing pool (16); and the temperature measurement output port (14) is connected to an analysis component.

2. The system for measuring the high-temperature-gas spatiotemporal migration characteristics of coal based on the matrix-type programmed temperature method according to claim 1, characterized in that: The gas source assembly comprises a nitrogen bottle (1), and the gas outlet end of the nitrogen bottle (1) is connected to the three-way valve (3) via a regulating valve (2).

3. The system for measuring the high-temperature-gas spatiotemporal migration characteristics of coal based on the matrix-type programmed temperature method according to claim 1, characterized in that: The air supply assembly comprises a fully automatic air source (7), a pressure gauge (5) and a pressure regulating knob (6) are installed on the fully automatic air source (7), and an air outlet end of the fully automatic air source (7) is connected to the three-way valve (3).

4. The system for measuring the high-temperature-gas spatiotemporal migration characteristics of coal based on the matrix-type temperature programming method according to claim 1 is characterized in that: A bracket (9) for mounting the coal sample tank (11) is fixedly connected to the lower portion of the constant temperature box (8), and a heating device for heating the coal sample tank (11) is installed in the constant temperature box (8).

5. The system for measuring the high-temperature-gas spatiotemporal migration characteristics of coal based on the matrix-type programmed temperature method according to claim 1 is characterized in that: The intelligent temperature-controlled gas collection module (24) comprises an adapter (30), wherein a temperature data transmission line (31) and an exhaust pipe (32) are provided in the adapter (30), a plurality of temperature sensors (26) are installed on one end of the temperature data transmission line (31) extending from the adapter (30), a plurality of exhaust holes (29) are provided on one end of the exhaust pipe (32) extending from the adapter (30), and the other end of the temperature data transmission line (31) and the exhaust pipe (32) extending from the adapter (30) passes through the temperature measurement output port (14) and is connected to the analysis component.

6. The system for measuring the high-temperature-gas spatiotemporal migration characteristics of coal based on the matrix-type temperature programming method according to claim 5, characterized in that: The plurality of temperature sensors (26) and the plurality of air extraction holes (29) are arranged at equal intervals and in a one-to-one correspondence.

7. The system for measuring the high-temperature-gas spatiotemporal migration characteristics of coal based on the matrix-type programmed temperature method according to claim 5, characterized in that: The plurality of temperature sensors (26) on the same horizontal plane form a single-layer temperature measurement area (25).

8. The system for measuring the high-temperature-gas spatiotemporal migration characteristics of coal based on the matrix-type temperature programming method according to claim 5, characterized in that: The analysis component comprises a computer (22), and the computer (22) is connected to a temperature data collector (17) and a gas analyzer (21).

9. The system for measuring the high-temperature-gas spatiotemporal migration characteristics of coal based on the matrix-type programmed temperature method according to claim 8, characterized in that: The temperature data collector (17) is connected to an air extraction pump (20) via a linkage controller (18); the air outlet of the air extraction pump (20) is connected to the gas analyzer (21); the air inlet of the air extraction pump (20) is connected to a cooler (19); and the cooler (19) is connected to the air extraction pipeline (32).

10. The system for measuring the high-temperature-gas spatiotemporal migration characteristics of coal based on the matrix-type programmed temperature method according to claim 9, characterized in that: The temperature data collector (17) is connected to the temperature data transmission line (31).

Images