Temperature control release type inhibition foam effect detection system for inhibiting spontaneous combustion of coal

Abstract

The invention discloses a temperature control release type inhibition foam effect detection system for inhibiting coal spontaneous combustion. The system comprises a temperature control simulation unit, a foaming dynamic monitoring unit, a gas detection unit, a data acquisition unit, a data processing module and a display device, wherein the temperature control simulation unit, the foaming dynamic monitoring unit and the gas detection unit are arranged in a detection device; the detection device comprises an outer container and an inner container; the inner container is arranged in the outer container; wherein the inner container is used for filling a coal sample and temperature-controlled release type inhibition foam, and the outer container is used for circularly filling the sample into the inner container for an experiment; the temperature control simulation unit, the foaming dynamic monitoring unit and the gas detection unit are arranged on the inner wall of the inner container and are in data connection with the data acquisition unit; the data acquisition unit is connected with the data processing module; the data processing module is connected with the display device; by simulating the coal spontaneous combustion environment and dynamically monitoring the foaming characteristics and the inerting effect of the inhibition foam, the visual analysis of the inhibition foam effect is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine safety, and more specifically to a temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion. Background Art

[0002] Coal spontaneous combustion is a major safety hazard in coal mining and storage. The inhibitor foam technology is widely used due to its covering and inerting properties. The temperature-controlled release type inhibitor foam consists of two sealed shells filled with different reaction solutions, and the shells are separated by a paraffin thin sheet. When the coal temperature rises to 60 °C at the initial stage of spontaneous combustion, the paraffin melts to mix the solutions, and the reaction generates inhibitor foam and carbon dioxide. The foam quickly spreads to cover the surface of the coal body to isolate oxygen and precisely inhibit coal spontaneous combustion. However, at present, there is no effect detection system designed for its experimental test effect, and there are no real-time monitoring means for the dynamic parameters such as the diffusion radius and height of the foam foaming in the coal body, relying on manual measurement, with low efficiency and large errors. The CO2 concentration detection has a slow response, and the sensor is easily interfered by dust, affecting the accuracy of the inerting efficiency calculation. The multi-source signals such as temperature, foaming, and gas are not effectively fused, and it is impossible to quickly generate a comprehensive evaluation index for the effect of the temperature-controlled release type inhibitor foam. In view of the above problems, the present invention proposes a detection system integrating temperature control simulation, microwave dynamic monitoring, and multi-source data fusion to improve the accuracy and reliability of the inhibitor foam effect evaluation. Summary of the Invention

[0003] The object of the present invention is a temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion, which realizes the visual analysis of the inhibitor foam effect by simulating the coal spontaneous combustion environment and dynamically monitoring the foaming characteristics and inerting effect of the inhibitor foam.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion, comprising: a temperature control simulation unit, a foaming dynamic monitoring unit, a gas detection unit provided in a detection device, and a data acquisition unit, a data processing module, and a display device connected to each unit;

[0006] The detection device includes an outer container and an inner container; the inner container is provided inside the outer container; wherein the inner container is used for filling coal samples and temperature-controlled release type inhibitor foam, and the outer container is used to accommodate the inner container to form a sealed experimental environment;

[0007] The temperature control simulation unit, the foaming dynamic monitoring unit, and the gas detection unit are all provided on the inner wall of the inner container and are respectively connected to the data acquisition unit; the data acquisition unit is connected to the data processing module; the data processing module is connected to the display device;

[0008] The temperature control simulation unit is used to control the temperature in the inner container to simulate the spontaneous combustion temperature rise process of coal samples;

[0009] The foaming dynamic monitoring unit is used to emit microwave signals to monitor the generation and change of temperature-controlled release type inhibitor foam in the inner container in real time;

[0010] The gas detection unit is used to detect the concentration of carbon dioxide in the inner container;

[0011] The data acquisition unit is used to acquire the temperature signal, microwave signal and carbon dioxide concentration signal in the inner container;

[0012] The data processing module is used to calculate the dynamic parameters of the carbon dioxide concentration and the coverage area parameters of the temperature-controlled release type inhibitor foam in the inner container;

[0013] The display device is used to visually display the dynamic parameters of the carbon dioxide concentration and the coverage area parameters of the temperature-controlled release type inhibitor foam.

[0014] Further, the temperature control simulation unit includes: a heating resistor, a temperature measuring thermocouple and a PID temperature control module;

[0015] The bottom of the inner container is suspended in the outer container by support columns, and a bottom space is formed between the bottom of the inner container and the bottom of the outer container;

[0016] The heating resistor and the temperature measuring thermocouple are respectively connected to the PID temperature control module; the PID temperature control module and the temperature measuring thermocouple are respectively connected to the data acquisition unit;

[0017] The heating resistor is arranged in the bottom space between the inner container and the outer container, and is used to create a temperature field and receive the temperature control signal from the PID temperature control module to adjust the heating power;

[0018] The temperature measuring thermocouple is arranged on the inner wall of the temperature-controlled release type inhibitor foam, and is used to measure the temperature signal of the temperature-controlled release type inhibitor foam in real time and feedback it to the PID temperature control module;

[0019] The PID temperature control module is used to receive the temperature signal collected by the temperature measuring thermocouple, and calculate the control signal through the PID algorithm to adjust the power of the heating resistor.

[0020] Further, the control logic of the PID temperature control module is: a three-stage temperature rise program; specifically: a 5°C / min rapid temperature rise section, a 1°C / min slow heating section, and a 0.5°C / min critical temperature holding section; when the temperature exceeds the set value by 10°C, the power supply is automatically cut off.

[0021] Further, the gas detection unit is specifically: a carbon dioxide sensor;

[0022] A metal dust cover is also provided inside the inner container; the metal dust cover is arranged at the midpoints of the four vertical sides inside the inner container, and its orientation faces the temperature-controlled release type inhibitor foam;

[0023] The carbon dioxide sensor is arranged inside the metal dust cover;

[0024] The detection range of the carbon dioxide sensor is 0 - 100% vol, and the response time ≤ 3 s.

[0025] Further, the foaming dynamic monitoring unit includes: a first microwave signal transmitter, a second microwave signal transmitter, a first microwave signal receiver, a second microwave signal receiver, an automatic gain adjustment module, and a Doppler compensation unit;

[0026] The first microwave signal receiver and the first microwave signal transmitter are arranged on the inner wall on the same side in the inner container;

[0027] The second microwave signal transmitter and the second microwave signal receiver are arranged on the opposite side of the first microwave signal receiver in the inner container;

[0028] The second microwave transmitter is arranged at the central position on the inner wall of the inner container; the second microwave signal receiver is arranged in a dot-line shape on the horizontal and vertical center lines on the inner wall of the inner container;

[0029] The first microwave signal transmitter is equipped with a first sector signal diffuser; the second microwave signal transmitter is equipped with a second sector signal diffuser for transmitting microwave signals to penetrate the temperature-controlled release type inhibitor foam;

[0030] The first microwave signal receiver is connected to the data acquisition unit through the automatic gain adjustment module and the Doppler compensation unit in sequence;

[0031] The second microwave signal receiver is connected to the data acquisition unit through the automatic gain adjustment module and the Doppler compensation unit in sequence;

[0032] The first microwave signal receiver is used to receive the vertical height signal of the foam;

[0033] The second microwave signal receiver is used to receive the horizontal width signal of the foam;

[0034] The automatic gain adjustment module is used to dynamically match the signal intensity;

[0035] The Doppler compensation unit is used to eliminate the frequency shift error caused by the movement of the foam.

[0036] Furthermore, the data processing module is built-in with an abnormal data recognition algorithm, and the security mode is activated when any of the following situations is detected: the temperature signal measured by the temperature-measuring thermocouple suddenly changes by more than 10 °C / s, or the attenuation amount of the microwave signal exceeds the database range for three consecutive samplings.

[0037] Furthermore, the display device is integrated with: a three-dimensional point cloud reconstruction module, a historical data comparison window, and an automatic detection report generation module;

[0038] The three-dimensional point cloud reconstruction module is used to dynamically display the foam diffusion pattern; the historical data comparison window is used to superimpose and display the standard curve and the measured data; the automatic detection report generation module is used to output the detection conclusion of the document.

[0039] According to the specific embodiments provided by the present invention, the following technical effects of the present invention are disclosed:

[0040] Through the integration of temperature control simulation, microwave dynamic monitoring, and multi-source data fusion, the present invention realizes multi-functional integration, reduces the equipment complexity, and improves the convenience and efficiency of the experiment; the temperature control simulation unit can accurately control the environmental temperature in the inner container, truly simulate the heating process of coal spontaneous combustion, and provide an accurate temperature environment for evaluating the effect of the inhibitor foam; the foaming dynamic monitoring unit uses microwave signals to monitor the generation and change of the foam in real time, ensuring the timeliness and accuracy of the experimental data, and providing strong support for analyzing the foam performance; the detection system of the present invention integrating temperature control simulation, microwave dynamic monitoring, and multi-source data fusion has significant technical advantages in the evaluation of the effect of the inhibitor foam for suppressing coal spontaneous combustion, not only improving the accuracy and reliability of the evaluation, but also enhancing the convenience and intuitiveness of the experiment through the integrated and visual design. These technical effects make the system have broad application prospects and practical values in related fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0042] The following further illustrates the temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion of the present invention in conjunction with the drawings;

[0043] Figure 1 is a schematic structural diagram of the temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion of the present invention;

[0044] Figure 2It is a schematic diagram of the foaming detection in Embodiment 1 of the present invention; among which, (a) is the signal for detecting the vertical height of the foam, and (b) is the signal for detecting the horizontal width of the foam.

[0045] Figure 3 It is a schematic diagram of the carbon dioxide sensor in the internal container in Embodiment 1 of the present invention; among which, (a) is the three-dimensional schematic diagram of the carbon dioxide sensor in the internal container, and (b) is the upward view schematic diagram of the carbon dioxide sensor in the internal container.

[0046] Figure 4 It is a schematic diagram of the foaming range of the temperature-controlled release type inhibitor foam in Embodiment 3 of the present invention.

[0047] Figure 5 It is a schematic diagram of the fan-shaped signal diffuser of the temperature-controlled release type inhibitor foam effect detection system for inhibiting coal spontaneous combustion in the present invention.

[0048] Figure 6 It is a flowchart of the detection method in Embodiment 3 of the present invention.

[0049] Figure 7 It is a schematic diagram of the structure of the temperature-controlled release type inhibitor foam device in Embodiment 3 of the present invention.

[0050] Figure 8 It is a graph of the change of carbon dioxide concentration over time in Embodiment 3 of the present invention.

[0051] In the figure: 1. External container; 2. Internal container; 3. First microwave receiver; 4. Temperature-measuring thermocouple; 5. First fan-shaped signal diffuser; 6. First microwave signal transmitter; 7. Support column; 8. Single-chip microcomputer; 9. Second microwave signal receiver; 10. Second fan-shaped signal diffuser; 11. Second microwave signal transmitter; 12. Temperature-controlled release type inhibitor foam; 13. Metal dust-proof cover; 14. Carbon dioxide sensor; 15. Heating resistor; 16. Display device; 17. PID temperature control module; 18. Gain adjustment module; 19. Doppler compensation unit. Specific Embodiments

[0052] The following combines the accompanying drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0053] In order to better understand the purpose, structure and function of the present invention, the following further describes the present invention in detail with reference to the accompanying drawings.

[0054] Embodiment 1

[0055] The present invention provides a temperature-controlled release type inhibitor foam effect detection system for inhibiting coal spontaneous combustion, as Figure 1As shown, the system includes: a temperature control simulation unit, a foaming dynamic monitoring unit, a gas detection unit, and a data acquisition unit, a data processing module and a display device connected to each unit.

[0056] The detection device includes an external container 1 and an internal container 2; the internal container 2 is arranged inside the external container 1; the internal container 2 is used to fill the coal sample and the temperature-controlled release type inhibitory foam 12, and the external container 1 is used to accommodate the internal container 2 to form a sealed experimental environment.

[0057] In this embodiment, the detection device is an inner and outer double-layer sealed container, the internal space is used to fill the coal sample and the temperature-controlled release type chemical foam 12, and a removable top plate is installed on the top for easy sample loading, which is supported by four support columns 7. A removable cover is provided on the top of the outer container 1 for cyclic sample loading of the inner container for experiment. The sample loading part of the inner container 2 is as follows: first, the experimental coal powder is introduced into the inner container 2 to half of its height, and then the sample loading is stopped, and the temperature-controlled release type chemical foam 12 is placed in the center of the top of the half-filled coal powder. After the temperature-controlled release type chemical foam 12 is placed, the coal powder is continued to be loaded, and the sample loading is stopped when the coal powder is at the top edge of the inner container 2, and the top plate of the inner container is covered.

[0058] The temperature control simulation unit, the foaming dynamic monitoring unit, and the gas detection unit are all arranged on the inner wall of the inner container 2, and are respectively connected to the data acquisition unit; the data acquisition unit is connected to the data processing module; the data processing module is connected to the display device;

[0059] The temperature control simulation unit is used to control the ambient temperature in the internal container 2 to simulate the temperature rise process of coal spontaneous combustion;

[0060] The foaming dynamic monitoring unit is used to emit microwave signals to monitor the generation and change of foam in the inner container 2 in real time;

[0061] The gas detection unit is used to detect the concentration of carbon dioxide in the inner container 2;

[0062] The data acquisition unit is used to collect the temperature signal, microwave signal and carbon dioxide concentration signal of the sample to be tested in the internal container 2;

[0063] The data processing module is used to calculate the concentration dynamic parameters of carbon dioxide in the internal container 2 and the foam coverage area parameters.

[0064] In this embodiment, the data processing module calculates the dynamic parameters of carbon dioxide concentration and the foam coverage area parameters through an algorithm model. The algorithm model includes but is not limited to: regression analysis, time series analysis, machine learning algorithm, image processing algorithm, machine learning algorithm, machine learning algorithm;

[0065] Calculate the dynamic parameters of carbon dioxide concentration by using one or more of regression analysis, time series analysis, and machine learning algorithms;

[0066] Calculate the foam coverage area parameter by using one or more of image processing algorithms, machine learning algorithms, and machine learning algorithms.

[0067] The display device is used to visually display the dynamic parameters of carbon dioxide concentration and the foam coverage area parameter.

[0068] The temperature control simulation unit includes: heating resistor 15, temperature measuring thermocouple 4, and PID temperature control module 17;

[0069] The inner container 2 is suspended in the outer container 1 by support columns 7, and a bottom space is formed between the bottom of the inner container 2 and the bottom of the outer container 1;

[0070] The heating resistor 15 and the temperature measuring thermocouple 4 are respectively connected to the PID temperature control module 17; the PID temperature control module 17 and the temperature measuring thermocouple 4 are respectively connected to the data acquisition unit.

[0071] The heating resistor 15 adopts a distributed ring layout and is arranged in the bottom space between the inner container 2 and the outer container 1, and is used to create a temperature field to conduct heat and receive the control signal of the PID temperature control module 17 to adjust the heating power;

[0072] The temperature measuring thermocouple 4 adopts a surface contact type thermocouple and is attached to the inner wall of the temperature control release type inhibitor foam 12, and is used to measure the temperature signal of the temperature control release type inhibitor foam 12 in real time and feedback it to the PID temperature control module 17;

[0073] The PID temperature control module 17 is used to receive the temperature signal collected by the temperature measuring thermocouple 4, and calculate the control signal through the PID algorithm to adjust the power of the heating resistor 15.

[0074] The control logic of the PID temperature control module 17 is: a three-stage temperature rising program; specifically: a 5°C / min rapid temperature rising section, a 1°C / min slow heating section, and a 0.5°C / min critical temperature holding section; when the temperature exceeds the set value by 10°C, the power supply is automatically cut off.

[0075] The gas detection unit is specifically: a carbon dioxide sensor 14;

[0076] A metal dust cover 13 is also provided inside the inner container 2; the metal dust cover 13 is arranged at the midpoints of the four vertical sides inside the inner container 2, and its orientation faces the temperature control release type inhibitor foam 12;

[0077] The carbon dioxide sensor 14 is disposed inside the metal dust-proof cover 13;

[0078] The detection range of the carbon dioxide sensor 14 is 0 - 100% vol, and the response time ≤ 3 s.

[0079] As Figure 3 shown, at the midpoints of the four vertical sides of the inner container 2, a metal dust-proof cover 13 is installed and inserted into the coal seam. The fine pores on its surface allow gas to enter smoothly and isolate the influence of coal dust on the probe of the detector; the carbon dioxide sensor 14 is installed inside the metal dust-proof cover 13.

[0080] The foaming dynamic monitoring unit includes: a first microwave signal transmitter 6, a second microwave signal transmitter 11, a first microwave signal receiver 3, a second microwave signal receiver 9, an automatic gain adjustment module 18, and a Doppler compensation unit 19;

[0081] The first microwave signal receiver 3 and the first microwave signal transmitter 6 are disposed on the same-side inner wall of the inner container 2;

[0082] The second microwave signal transmitter 11 and the second microwave signal receiver 9 are disposed on the opposite side of the first microwave signal receiver 3 inside the inner container 2;

[0083] The second microwave transmitter 11 is disposed at the central position on the inner wall of the inner container 2; the second microwave signal receiver 9 is arranged in a dot-line shape on the horizontal center line of the inner wall of the inner container 2;

[0084] As Figure 5 shown, the first microwave signal transmitter 6 is equipped with a first sector signal diffuser 5; the second microwave signal transmitter 11 is equipped with a second sector signal diffuser 10 for transmitting microwave signals to penetrate the temperature-controlled release type inhibitor foam 12;

[0085] The first microwave signal receiver 3 is connected to the data acquisition unit through the automatic gain adjustment module 18 and the Doppler compensation unit 19 in sequence;

[0086] The second microwave signal receiver 9 is connected to the data acquisition unit through the automatic gain adjustment module 18 and the Doppler compensation unit 19 in sequence;

[0087] As Figure 2 shown, the first microwave signal receiver 3 is used to receive the vertical height signal of the foam;

[0088] The second microwave signal receiver 9 is used to receive the horizontal width signal of the foam;

[0089] The automatic gain adjustment module 18 is used to dynamically match the signal strength;

[0090] The Doppler compensation unit 19 is used to eliminate the frequency shift error caused by the movement of the foam.

[0091] In this embodiment, the operating frequencies of the first microwave signal transmitter 6 and the second microwave signal transmitter 11 are 10 - 40 GHz, and the adjustable range of the transmission power is 0.1 - 5 W; the first microwave signal receiver 3 and the first microwave signal transmitter 6 are arranged in a fan-shaped layout, and both the first microwave signal transmitter 6 and the first microwave signal receiver 3 are installed on the inner wall of the inner container 2. Among them, for measuring the vertical height of the foam: the first microwave signal receivers 3 are distributed in a dot-line shape along the vertical center line of the side inner wall. For measuring the horizontal height of the foam: the second microwave signal receivers 9 are arranged in a dot-line shape on the horizontal center line of the inner wall of the inner container 2. After the signal received by the data acquisition and processing unit is processed by Fourier transform, the real-time foam radius is calculated through the following formula:

[0092]

[0093] where c is the speed of light and f is the transmission frequency, is the phase difference.

[0094] The data processing module is built-in with an abnormal data recognition algorithm, and the safety mode is activated when any of the following situations is detected: the temperature signal measured by the temperature-measuring thermocouple 4 suddenly changes by more than 10 °C / s or the microwave signal attenuation amount exceeds the database range for three consecutive samplings.

[0095] Among them, the abnormal data recognition algorithm includes, but is not limited to: mutation detection algorithm, trend analysis algorithm, threshold comparison algorithm.

[0096] The display device 16 is integrated with: a three-dimensional point cloud reconstruction module, a historical data comparison window, and an automatic detection report generation module;

[0097] The three-dimensional point cloud reconstruction module is used to dynamically display the foam diffusion form; the historical data comparison window is used to superimpose and display the standard curve and the measured data; the automatic detection report generation module is used to output the detection conclusion of the document.

[0098] Embodiment 2

[0099] Temperature-controlled release type inhibitor foam:

[0100] As Figure 7 shown, the temperature-controlled release type inhibitor foam for suppressing coal spontaneous combustion includes base reactant a, base reactant b, foaming agent, foam stabilizer, compatibility inhibitor, and water;

[0101] In this embodiment, the basic reactant a solution is a sodium carbonate solution, and the basic reactant b solution is a phosphoric acid solution with a mass percentage concentration of 10%. The reaction ratio of the two solutions can be adjusted as needed. The chemical equation for their reaction is:

[0102] Na2CO3 + 2H3PO4 = 2NaH2PO4 + CO2↑ + H2O

[0103] In this embodiment, the foaming agent is sodium dodecyl sulfate, the foam stabilizer is sodium carboxymethyl cellulose, and the compatibility inhibitor is sodium chloride.

[0104] A temperature-controlled release type inhibitor foam release system for inhibiting coal spontaneous combustion provided in this embodiment includes a temperature-controlled release type inhibitor foam raw material for inhibiting coal spontaneous combustion and a spherical container. The spherical container includes a housing A and a housing B. The housing A and the housing B are hemispherical, and the housing A and the housing B are mirror-symmetrical. Four paraffin plugs higher than the melting point of the paraffin sheet are arranged on both the housing A and the housing B. The high-pressure foam gas generated by the reaction impacts the paraffin plugs and sprays out. The housing A and the housing B are buckled to form a sealed cavity for containing the temperature-controlled release type inhibitor foam raw material for inhibiting coal spontaneous combustion, and an internal temperature-sensitive isolator is arranged on the buckling docking surface; the melting temperature of the internal temperature-sensitive isolator is the temperature in the initial stage of coal spontaneous combustion, and the temperature in the initial stage of coal spontaneous combustion is 60°C.

[0105] The spherical container is a polytetrafluoroethylene hollow sphere, which is opened from the middle into a hemisphere A and a hemisphere B. The hemisphere A is used to contain the mixed solution X of sodium carbonate, sodium dodecyl sulfate, and sodium carboxymethyl cellulose, and the hemisphere B is used to contain the mixed solution Y of phosphoric acid and sodium chloride.

[0106] The prepared temperature-controlled release type inhibitor foam release system for inhibiting coal spontaneous combustion is arranged in the effect test system. When the temperature reaches the temperature in the initial stage of coal spontaneous combustion, the internal temperature-sensitive isolator - the paraffin thin sheet melts, the mixed solution X contacts the mixed solution Y, sodium carbonate reacts with phosphoric acid to generate sodium dihydrogen phosphate, carbon dioxide and water. Under the action of sodium dodecyl sulfate, sodium carboxymethyl cellulose, and sodium chloride, a mixed inhibitor foam is formed, and high air pressure is generated inside the temperature-controlled release type inhibitor foam release system for inhibiting coal spontaneous combustion, ejecting the paraffin plugs.

[0107] Example 3

[0108] Method for detecting the effect of temperature-controlled release type inhibitor foam for inhibiting coal spontaneous combustion:

[0109] As Figure 6As shown, after the experimental pulverized coal and the temperature-controlled release type inhibitor foam 12 are placed, the single-chip microcomputer 8 controls the first microwave transmitter 6 and the second microwave transmitter 11 to emit microwave signals. The first microwave receiver 3 and the second microwave signal receiver 9 receive the signals and transmit them to the single-chip microcomputer 8, and record this set of signals as the original signals. After the original signals are recorded, the single-chip microcomputer 8 controls the ring heating resistor 15 to heat up. When the temperature value detected by the temperature measuring thermocouple 4 reaches the foaming critical temperature of 60° of the temperature-controlled release type inhibitor foam 12, the temperature-controlled release type inhibitor foam foams. The single-chip microcomputer 8 controls the ring heating resistor 15 to stop heating, and controls the carbon dioxide sensor 14 to start detecting the change of the carbon dioxide concentration signal. After the heating program stops, the single-chip microcomputer 8 controls the first microwave signal transmitter 6 and the second microwave signal transmitter 11 to emit microwave signals. The first microwave receiver 3 and the second microwave signal receiver 9 receive the signals and transmit the signals to the single-chip microcomputer. When the microwave signals are inconsistent with the original signals, it means that inhibitor foam has appeared on this path. When the deviation of the carbon dioxide concentration signal value change is below 3 ppm / s, the single-chip microcomputer 8 controls the carbon dioxide sensor 14 and the foaming dynamic monitoring unit to stop detecting, and transmits the data to the display device 16 for data analysis. The data acquisition unit and the data processing module are integrated with the single-chip microcomputer connected to the display device, and are used for visualizing the experimental data.

[0110] After analyzing and processing the microwave signal data, the obtained foam horizontal length and vertical height are transmitted to the display device 16, and the foaming effect diagram of the temperature-controlled release type inhibitor foam can be drawn, as Figure 4 shown; the received carbon dioxide concentration signal is transmitted to the display device 16, and the experimental data as shown in Figure 8 is obtained.

[0111] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion, characterized in that, Including: A temperature control simulation unit, a foaming dynamic monitoring unit, a gas detection unit, a data acquisition unit, a data processing module and a display device (16) connected to each unit, which are arranged in the detection device; The detection device includes an outer container (1) and an inner container (2); the inner container (2) is arranged inside the outer container (1); wherein the inner container (2) is used to fill coal samples and temperature-controlled release-type inhibitor foam (12), and the outer container (1) is used to accommodate the inner container (2) to form a sealed experimental environment; The temperature control simulation unit, the foaming dynamic monitoring unit, and the gas detection unit are all arranged on the inner wall of the inner container (2) and are respectively connected to the data acquisition unit; the data acquisition unit is connected to the data processing module; the data processing module is connected to the display device; The temperature control simulation unit is used to control the temperature in the inner container (2) to simulate the spontaneous heating process of coal samples; The foaming dynamic monitoring unit is used to emit microwave signals to monitor the generation and change of the temperature-controlled release-type inhibitor foam (12) in the inner container (2) in real time; The gas detection unit is used to detect the concentration of carbon dioxide in the inner container (2); The data acquisition unit is used to acquire the temperature signal, microwave signal and carbon dioxide concentration signal in the inner container (2); The data processing module is used to calculate the dynamic parameters of the carbon dioxide concentration and the coverage area parameters of the temperature-controlled release-type inhibitor foam (12) in the inner container (2); The display device is used to visually display the dynamic parameters of the carbon dioxide concentration and the coverage area parameters of the temperature-controlled release-type inhibitor foam (12).

2. The temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion according to claim 1, wherein The temperature control simulation unit includes: a heating resistor (15), a temperature measuring thermocouple (4) and a PID temperature control module (17); The bottom of the inner container (2) is suspended in the outer container (1) through a support column (7), and a bottom space is formed between the bottom of the inner container (2) and the bottom of the outer container (1); The heating resistor (15) and the temperature measuring thermocouple (4) are respectively connected to the PID temperature control module (17); the PID temperature control module (17) and the temperature measuring thermocouple (4) are respectively connected to the data acquisition unit; The heating resistor (15) is arranged at the bottom space between the inner container (2) and the outer container (1) and is used to create a temperature field and receive the temperature control signal from the PID temperature control module (17) to adjust the heating power; The temperature measuring thermocouple (4) is arranged on the inner wall of the temperature-controlled release-type inhibitor foam (12) and is used to measure the temperature signal of the temperature-controlled release-type inhibitor foam (12) in real time and feedback it to the PID temperature control module (17); The PID temperature control module (17) is used to receive the temperature signal collected by the temperature measuring thermocouple (4) and calculate the control signal through the PID algorithm to adjust the power of the heating resistor (15).

3. The temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion according to claim 2, characterized in that, The control logic of the PID temperature control module (17) is: a three-stage heating program; specifically: a rapid heating section at 5 °C / min, a slow heating section at 1 °C / min, and a critical temperature holding section at 0.5 °C / min; when the temperature exceeds the set value by 10 °C, the power supply is automatically cut off.

4. The temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion according to claim 1, wherein, The gas detection unit is specifically: a carbon dioxide sensor (14); A metal dust cover (13) is further provided inside the inner container (2); the metal dust cover (13) is provided at the midpoints of the four vertical sides inside the inner container (2), and its orientation faces the temperature-controlled release type inhibitor foam (12); The carbon dioxide sensor (14) is provided inside the metal dust cover (13); The detection range of the carbon dioxide sensor (14) is 0-100% vol, and the response time ≤ 3 s.

5. The temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion according to claim 1, wherein, The foaming dynamic monitoring unit includes: a first microwave signal transmitter (6), a second microwave signal transmitter (11), a first microwave signal receiver (3), a second microwave signal receiver (9), an automatic gain adjustment module (18), and a Doppler compensation unit (19); The first microwave signal receiver (3) and the first microwave signal transmitter (6) are provided on the same-side inner wall of the inner container (2); The second microwave signal transmitter (11) and the second microwave signal receiver (9) are provided on the opposite side of the first microwave signal receiver (3) in the inner container (2); The second microwave transmitter (11) is provided at the central position on the inner wall of the inner container (2); the second microwave signal receiver (9) is arranged in a dot-line shape on the horizontal and vertical center lines on the inner wall of the inner container (2); The first microwave signal transmitter (6) is equipped with a first sector signal diffuser (5); the second microwave signal transmitter (11) is equipped with a second sector signal diffuser (10) for transmitting microwave signals to penetrate the temperature-controlled release type inhibitor foam (12); The first microwave signal receiver (3) is connected to the data acquisition unit through the automatic gain adjustment module (18) and the Doppler compensation unit (19) in sequence; The second microwave signal receiver (9) is connected to the data acquisition unit through the automatic gain adjustment module (18) and the Doppler compensation unit (19) in sequence; The first microwave signal receiver (3) is used to receive the vertical height signal of the foam; The second microwave signal receiver (9) is used to receive the horizontal width signal of the foam; The automatic gain adjustment module (18) is used to dynamically match the signal intensity; The Doppler compensation unit (19) is used to eliminate the frequency shift error caused by the movement of the foam.

6. The temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion according to claim 1, characterized in that, The data processing module is built-in with an abnormal data recognition algorithm, and the safety mode is started when any of the following situations is detected: the temperature signal measured by the temperature measuring thermocouple (4) suddenly changes by more than 10 °C / s or the microwave signal attenuation amount exceeds the database range for 3 consecutive samples.

7. The temperature-controlled release type inhibitor foam effect detection system for suppressing coal spontaneous combustion according to claim 1, wherein The display device (16) is integrated with: a three-dimensional point cloud reconstruction module, a historical data comparison window, and an automatic detection report generation module; The three-dimensional point cloud reconstruction module is used for dynamically displaying the foam diffusion pattern; the historical data comparison window is used for superimposing and displaying the standard curve and the measured data; the automatic detection report generation module is used for outputting the detection conclusion of the document.

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