Loaded broken coal multi-element gas injection adsorption replacement experiment system based on intelligent sensor

Abstract

The invention discloses a loaded crushed coal multi-element gas injection adsorption replacement experiment system based on an intelligent sensor, and relates to the technical field of coal rock experiments, the system comprises a triaxial clamping assembly used for clamping a sample and applying triaxial pressure, and the triaxial clamping assembly is provided with a gas inlet end and a gas outlet end; the gas supply assembly is connected to the gas inlet end and used for supplying multi-element gas to the three-axis clamping assembly; the temporary storage bin is connected to the gas outlet end and used for receiving and temporarily storing the gas flowing out of the three-axis clamping assembly; the detector is arranged at the side part of the temporary storage bin and is used for detecting the concentration of each gas component in the temporary storage bin in real time; wherein the gas supply assembly can supply oxygen, inert gas and tracer gas; concentration data detected and generated by the detector is used for analyzing the adsorption and replacement mechanism of the injected inert gas in the loaded broken coal, and a guidance basis is provided for preventing and treating coal spontaneous combustion.

Description

Technical Field

[0001] This invention relates to the field of coal and rock experimental technology, and specifically to a multi-element gas injection adsorption and replacement experimental system for loaded crushed coal based on intelligent sensors. Background Technology

[0002] Spontaneous combustion of coal is a major threat to mine safety, and injecting inert gases (such as nitrogen and carbon dioxide) into goafs or broken coal seams is the primary technical means of preventing and controlling spontaneous combustion. However, in field practice, it has been found that the effect of inert gas injection in extinguishing fires is sometimes not ideal, and there is a risk of reignition after "surface inerting." The fundamental reason for this is that people still lack a clear and quantitative understanding of the complex "physical-chemical" synergistic inerting mechanism in loaded broken coal.

[0003] Existing experimental setups have limitations in revealing this underlying mechanism. First, most setups cannot realistically simulate the downhole stress environment, leading to a disconnect between experimental data and actual field conditions. A more critical deficiency lies in the inability of current technology to decouple the macroscopic gas flow and microscopic adsorption-displacement processes; the monitored outlet concentration change is a lumped parameter encompassing multiple effects, including physical displacement and chemical replacement. Furthermore, the traditional system's simplistic gas supply methods limit the range of simulation techniques available.

[0004] Therefore, it is necessary to provide a multi-element gas injection adsorption and replacement experimental system for loaded crushed coal based on intelligent sensors to solve the above problems. Summary of the Invention

[0005] To address the above problems, this invention provides the following technical solution: a multi-element gas injection adsorption-displacement experimental system for loaded crushed coal based on intelligent sensors, comprising:

[0006] A three-axis clamping assembly is used to clamp a sample and apply triaxial pressure. The three-axis clamping assembly has an air inlet and an air outlet.

[0007] An air supply assembly, connected to the air inlet, is used to supply multi-element gas to the triaxial clamping assembly;

[0008] A temporary storage chamber, connected to the gas outlet, is used to receive and temporarily store the gas flowing out from the triaxial clamping assembly;

[0009] A detector is installed on the side of the temporary storage chamber to detect the concentration of each gas component in the temporary storage chamber in real time.

[0010] The gas supply component can supply oxygen, inert gas, and tracer gas; the detector detects the generated concentration data to analyze the adsorption and replacement mechanism of the injected inert gas in the loaded crushed coal.

[0011] Furthermore, preferably, the triaxial clamping assembly includes at least:

[0012] outer cylinder;

[0013] A first plug is disposed at one end of the outer cylinder, and the first plug has a first flow channel serving as the air outlet.

[0014] A second plug is provided at the other end of the outer cylinder, and the second plug has a second flow channel that serves as the air inlet.

[0015] The annular cylinder is fitted between the first plug and the second plug, and together with the first plug and the second plug, forms a chamber for containing the sample and applying pressure.

[0016] Furthermore, preferably, the second plug is provided with a flow channel switching component, the flow channel switching component comprising:

[0017] A flow channel seat is disposed in the second plug, wherein a central flow channel is provided in the middle and the central flow channel is connected to the second flow channel;

[0018] An accommodating space is provided in the middle of the flow channel seat and is connected to the central flow channel;

[0019] A flow channel is provided on one side of the flow channel seat and connects to the receiving space; the flow channel extends through the second plug.

[0020] The switching plate is slidably disposed within the accommodating space;

[0021] A telescopic rod, driven and connected to the switching plate, is used to drive the switching plate to move;

[0022] The switching plate has a central receiving slot on one side and a diversion hole on the other side that corresponds to the diversion channel and communicates with the central receiving slot. The movement of the switching plate can selectively connect the diversion hole to the central channel and the diversion channel, or only keep the central channel unobstructed.

[0023] Furthermore, as a preferred embodiment, a pressure relief valve is provided in the diversion channel.

[0024] Furthermore, preferably, the gas supply assembly includes:

[0025] An air supply cylinder, one end of which is used to connect an oxygen source and an inert gas source;

[0026] The flow control chamber is connected to the other end of the air supply cylinder;

[0027] A connector is connected to the end of the flow control chamber away from the air supply cylinder and is used to connect to the air inlet end;

[0028] A gas cylinder for storing tracer gas and connected to the flow control chamber;

[0029] A flow sensor, located on the connector, is used to monitor the flow rate of the mixed gas flowing through the connector, and its monitoring signal is used to regulate the gas supply.

[0030] Furthermore, as a preferred embodiment, the flow control chamber is equipped with a Venturi tube;

[0031] The gas cylinder is connected to the throat of the venturi tube, and the gas cylinder contains:

[0032] A ring baffle is fixed to the inner wall of the gas tank, and the inner surface of the ring baffle is a downwardly inclined conical surface;

[0033] The slide bar is set to slide vertically.

[0034] A conical plug is fixed to the bottom end of the slide rod. The conical surface of the conical plug mates with the conical surface of the ring stop to control the opening degree of the gas tank toward the throat of the Venturi tube.

[0035] A spring is connected between the slide rod and the ring stop;

[0036] The support rod is fixed to the bottom of the conical plug;

[0037] A cam is rotatably mounted inside the throat of the venturi tube, and the working surface of the cam abuts against the bottom end of the support rod to drive the support rod to rise and fall.

[0038] Furthermore, preferably, the cam is rotatably connected to the venturi tube via a rotating shaft, the rotating shaft extending out of the venturi tube and hinged to one end of the connecting rod;

[0039] The other end of the connecting rod is hinged to the piston rod of the telescopic cylinder;

[0040] The cylinder body of the telescopic cylinder is hinged to one side of the flow control chamber.

[0041] Furthermore, as a preferred embodiment, a follower rod is also hinged to the cam; a piston is hinged to the other end of the follower rod; the piston is slidably and sealed in the bottom chamber; the bottom chamber is connected to the lower throat of the venturi tube.

[0042] Furthermore, as a preferred option, it also includes:

[0043] A vacuum suction chamber is located at the bottom of the temporary storage chamber and is connected to the temporary storage chamber. It is used to evacuate the temporary storage chamber to promote the flow of gas out of the triaxial clamping assembly.

[0044] Compared with existing technologies, this invention provides a multi-element gas injection adsorption-displacement experimental system for loaded crushed coal based on intelligent sensors, which has the following beneficial effects:

[0045] In this invention, by introducing periodic tracer gas pulses as time probes, the macroscopic seepage velocity is calibrated using their non-adsorption properties. Combined with the comprehensive changes in oxygen concentration, the microscopic displacement process is effectively separated from the macroscopic seepage background, providing data support for revealing an effective inerting mechanism.

[0046] In this invention, a flow control chamber is set up to achieve the above decoupling analysis. The Venturi effect is used to provide passive suction, and the opening and closing are realized by a cam-spring mechanism and the piston is used to realize pulse air supply. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the overall structure of a multi-element gas injection adsorption-displacement experimental system for loaded crushed coal based on intelligent sensors.

[0048] Figure 2 A three-dimensional structural diagram of the flow channel switching component;

[0049] Figure 3 A three-dimensional structural diagram of the gas supply component;

[0050] Figure 4 This is a cross-sectional view of the flow control chamber.

[0051] In the diagram: 1. Three-axis clamping assembly; 11. First plug; 12. Second plug; 13. Ring cylinder; 14. First flow channel; 15. Second flow channel; 16. Flow channel switching assembly; 2. Temporary storage chamber; 3. Detector; 4. Vacuum suction chamber; 5. Air supply assembly; 161. Flow channel seat; 162. Central flow channel; 163. Flow channel; 164. Switching plate; 165. Flow diversion hole; 166. Telescopic rod; 51. Air supply cylinder; 52. Flow control chamber; 53. Connector; 54. Flow sensor; 55. Air tank; 56. Telescopic cylinder; 57. Connecting rod; 58. Rotating shaft; 521. Venturi tube; 522. Bottom chamber; 523. Piston; 524. Cam; 525. Follower rod; 551. Ring stop; 552. Conical plug; 553. Slide rod; 554. Support rod. Detailed Implementation

[0052] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0053] Example: In this embodiment of the invention, please refer to... Figures 1-4 This paper provides a multi-element gas injection adsorption-displacement experimental system for loaded crushed coal based on intelligent sensors, including:

[0054] A three-axis clamping assembly 1 is used to clamp a sample and apply triaxial pressure. The three-axis clamping assembly 1 has an air inlet and an air outlet.

[0055] The gas supply assembly 5 is connected to the gas inlet end and is used to supply multi-element gas to the triaxial clamping assembly 1;

[0056] Temporary storage chamber 2, connected to the gas outlet, is used to receive and temporarily store the gas flowing out from the triaxial clamping assembly 1;

[0057] Detector 3 is located on the side of the temporary storage chamber 2 and is used to detect the concentration of each gas component in the temporary storage chamber 2 in real time;

[0058] The gas supply component 5 can supply oxygen, inert gas, and tracer gas; the detector 3 detects the generated concentration data to analyze the adsorption and replacement mechanism of the injected inert gas in the loaded crushed coal.

[0059] In the initial stage of the experiment, the gas supply component 5 first injects high-purity oxygen into the triaxial clamping component 1, which has been subjected to ground stress and temperature, and maintains it for a sufficient period of time until the adsorption of oxygen by the coal sample reaches a dynamic equilibrium.

[0060] Then, gas supply component 5 begins to inject mainstream inert gas (such as N2 or CO2) into the coal sample. This gas flow constitutes the main body of the entire inerting and replacement process, and its role is to physically displace and chemically replace the oxygen that has been adsorbed in the coal sample.

[0061] While continuously injecting the mainstream inert gas, the gas supply component 5 will instantaneously and periodically inject a tiny, precisely measured pulse of tracer gas (such as He) into the mainstream inert gas according to preset time intervals or concentration change trigger conditions. It is important to note that this is not a continuous, low-concentration mixed flow; its purpose is not simply gas mixing, but rather to use the tracer gas as a time probe. Since the tracer gas is hardly adsorbed by coal, its migration velocity purely reflects the gas's seepage capacity in the macroscopic fractures of the coal body. By measuring the time from the injection of the tracer gas to its appearance at the outlet, a macroscopic seepage channel patency can be obtained at a specific moment, facilitating subsequent decoupling calculations and making the final evaluation conclusion of the effective inertization mechanism more reliable and convincing.

[0062] More specifically, detector 3 monitors gas components in real time at a high frequency to ensure complete capture of the concentration spike response curve generated by each tracer gas pulse.

[0063] Given the non-adsorption nature of tracer gases, the time difference between the injection time and the peak concentration at the outlet is defined as the instantaneous seepage time of the gas in the current coal sample.

[0064] The total time required from the start of the experiment to the point where the O2 concentration at the outlet drops to a safe threshold is recorded. This time comprehensively reflects the entire process of macroscopic transport and microscopic displacement.

[0065] The micro-displacement characteristic time is calculated by subtracting the instantaneous seepage time from the total time, thus effectively separating the slow micro-displacement process from the rapid macro-seepage background. By repeating this calculation for each pulse cycle, dynamic data on the evolution of these parameters over time can be obtained. Finally, a quantitative evaluation curve is generated, revealing the inertization mechanism.

[0066] In this embodiment, the three-axis clamping assembly 1 includes at least:

[0067] outer cylinder;

[0068] A first plug 11 is disposed at one end of the outer cylinder, and the first plug 11 is provided with a first flow channel 14 serving as the air outlet end;

[0069] The second plug 12 is disposed at the other end of the outer cylinder, and the second plug 12 is provided with a second flow channel 15 serving as the air inlet end;

[0070] The annular cylinder 13 is sleeved between the first plug 11 and the second plug 12, and together with the first plug 11 and the second plug 12, forms a chamber for containing the sample and applying pressure.

[0071] The second plug 12 is provided with a flow channel switching component 16, which includes:

[0072] A flow channel seat 161 is disposed in the second plug 12, and a central flow channel 162 is provided in the middle of the central flow channel 162, which is connected to the second flow channel 15;

[0073] The accommodating space is opened in the middle of the flow channel seat 161 and is connected to the central flow channel 162;

[0074] A flow channel 163 is formed on one side of the flow channel seat 161 and connects to the accommodating space. The flow channel 163 extends through the second plug 12.

[0075] The switching plate 164 is slidably disposed within the accommodating space;

[0076] The telescopic rod 166 is driven to the switching plate 164 and is used to drive the switching plate 164 to move.

[0077] The switching plate 164 has a central receiving groove on one side and a diversion hole 165 on the other side that corresponds to the diversion channel 163 and communicates with the central receiving groove. The movement of the switching plate 164 can selectively connect the diversion hole 165 to the central channel 162 and the diversion channel 163, or only make the central channel 162 unobstructed.

[0078] A pressure relief valve is provided in the diversion channel 163.

[0079] The triaxial clamping assembly 1, together with the first plug 11, the second plug 12 and the ring cylinder 13, forms a chamber for accommodating the sample and applying pressure. The first plug 11 and the second plug 12 serve as the air outlet and air inlet, respectively. The first flow channel 14 and the second flow channel 15 inside provide channels for gas to enter and exit. Together with the axial loading system and the confining pressure loading system, it achieves triaxial pressure loading on the sample. This is existing technology and will not be described in detail here.

[0080] In this embodiment, unlike the prior art, when the telescopic rod 166 drives the switching plate 164 to extend into the accommodating space, the central receiving slot intercepts the gas in the central flow channel 162 and enters the diversion channel 163 through the diversion hole 165, achieving uniform gas supply. When the telescopic rod 166 drives the switching plate 164 to extend out of the accommodating space, the central flow channel 162 is not obstructed. Furthermore, since a pressure relief valve is provided in the diversion channel 163, the gas preferentially flows out from the central flow channel 162, achieving centralized gas supply. In other words, it has two working modes, which enriches the experimental methods and provides a hardware foundation for simulating more complex gas flow fields (such as non-uniform flow and oscillating flow) in the sample chamber, enabling the research to be closer to certain extreme or special engineering real-world scenarios.

[0081] In addition, the telescopic rod 166 is an actuator that enables automatic switching, and it can be any one of a hydraulic telescopic cylinder, a pneumatic cylinder, or an electric push rod.

[0082] In this embodiment, the gas supply component 5 includes:

[0083] An air supply cylinder 51, one end of which is used to connect an oxygen source and an inert gas source;

[0084] The flow control chamber 52 is connected to the other end of the air supply cylinder 51;

[0085] Connector 53 is connected to the end of the flow control chamber 52 away from the air supply cylinder 51 and is used to connect to the air inlet end;

[0086] Gas tank 55 is used to store tracer gas and is connected to the flow control chamber 52;

[0087] A flow sensor 54 is disposed on the connector 53 and is used to monitor the flow rate of the mixed gas flowing through the connector 53. The monitoring signal is used to adjust the gas supply.

[0088] During the preparation phase of the experiment, the system requires a coal sample saturated with pure oxygen. At this point:

[0089] The function of the gas supply cylinder 51 is to serve as a dedicated inlet for the oxygen source. High-purity oxygen is introduced into the gas supply cylinder 51, then flows through the flow control chamber 52 and the connector 53, and finally is injected into the triaxial clamping assembly 1. During this stage, the gas tank 55 storing tracer gas is in a closed state and does not participate in the operation. The flow sensor 54 is responsible for monitoring and controlling the flow rate of the injected oxygen to ensure that the saturation process proceeds stably under the set pressure and flow conditions.

[0090] After the coal sample is fully saturated with oxygen, at this point:

[0091] The function of gas supply cylinder 51 is switched to a dedicated inlet for the inert gas source. The main inert gas is introduced, and gas tank 55 begins to inject tracer gas pulses into the flow control chamber 52. The flow sensor 54 monitors the total flow rate of this composite gas, and its signal is used to provide feedback and adjust the supply of the main inert gas to ensure that the overall flow rate remains stable after the pulses are superimposed.

[0092] In this embodiment, a venturi tube 521 is provided in the flow control chamber 52;

[0093] The gas cylinder 55 is connected to the throat of the venturi tube 521, and the gas cylinder 55 is provided with:

[0094] A ring 551 is fixed to the inner wall of the gas tank 55, and the inner surface of the ring 551 is a downwardly inclined conical surface.

[0095] Slide bar 553 is set to slide vertically;

[0096] A conical plug 552 is fixed to the bottom end of the slide rod 553. The conical surface of the conical plug 552 cooperates with the conical surface of the ring stop 551 to control the opening degree of the gas tank 55 to the throat of the venturi tube 521.

[0097] A spring is connected between the slide rod 553 and the ring stop 551;

[0098] Support rod 554 is fixed to the bottom of the conical plug 552;

[0099] A cam 524 is rotatably disposed inside the throat of the venturi tube 521. The working surface of the cam 524 abuts against the bottom end of the support rod 554 and is used to drive the support rod 554 to rise and fall.

[0100] The cam 524 is rotatably connected to the venturi tube 521 via a rotating shaft 58, and the rotating shaft 58 extends out of the venturi tube 521 and is hinged to one end of the connecting rod 57.

[0101] The other end of the connecting rod 57 is hinged to the piston rod of the telescopic cylinder 56;

[0102] The cylinder body of the telescopic cylinder 56 is hinged to one side of the flow control chamber 52.

[0103] In addition, a follower rod 525 is hinged to the cam 524; a piston 523 is hinged to the other end of the follower rod 525; the piston 523 is slidably disposed in the bottom chamber 522; the bottom chamber 522 is connected to the lower throat of the venturi tube 521.

[0104] In other words, the goal of the flow control chamber 52 is to achieve periodic, precisely metered pulse injection of the tracer gas, while the mainstream inert gas remains continuous and stable.

[0105] Specifically, the mainstream inert gas continuously flows through the Venturi tube 521. According to the principles of fluid mechanics, when the gas passes through the throat of the Venturi tube, the flow velocity increases sharply, resulting in a stable low-pressure zone at that point. This low-pressure zone continuously and automatically attempts to draw out the tracer gas from the gas tank 55.

[0106] Without external force, the spring force continuously pushes the slide rod 553 and the conical plug 552 downwards, causing their conical surfaces to press tightly against the conical surface of the ring retainer 551, forming a reliable seal. At this time, the tracer gas is completely sealed inside the gas tank 55 and cannot flow out.

[0107] When a tracer gas pulse is needed, the telescopic cylinder 56 is activated, driving the cam 524 to rotate via the connecting rod 57. The protruding part of the cam 524 lifts the support rod 554 upward. This upward thrust overcomes the preload of the spring, quickly lifting the slide rod 553 and the conical plug 552, disengaging them from the ring stop 551, and the valve opens instantaneously. At the same time, the piston 523 is driven to slide downward via the follower rod 525.

[0108] At the moment the valve opens, the tracer gas is rapidly drawn out due to the negative pressure generated at the throat of the venturi tube 521. When the cam 524 returns to its original position and rotates, the upward thrust disappears, and the spring force immediately pulls the conical plug 552 back to its original position, where it is once again tightly fitted with the ring stop 551, and the valve closes quickly. At the same time, the piston 523 is driven to slide upward through the follower rod 525, forming a pulse.

[0109] In addition, the telescopic cylinder 56 can be either a hydraulic telescopic cylinder or a pneumatic cylinder.

[0110] This experimental system also includes:

[0111] Vacuum suction chamber 4 is located at the bottom of the temporary storage chamber 2 and is connected to the temporary storage chamber 2. It is used to evacuate the temporary storage chamber 2 to promote the flow of gas out of the triaxial clamping assembly 1.

[0112] In the initial preparation stage of the experiment, the vacuum suction chamber 4 begins to operate. Through its internal or external vacuum pump, it performs a vacuum operation on the temporary storage chamber 2 connected to it and the sample, eliminating other interfering factors and achieving thorough purification and purging of the internal environment of the entire system.

[0113] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-element gas injection adsorption-displacement experimental system for loaded crushed coal based on intelligent sensors, characterized in that, include: A three-axis clamping assembly (1) is used to clamp a sample and apply triaxial pressure. The three-axis clamping assembly (1) has an air inlet and an air outlet. The gas supply assembly (5) is connected to the gas inlet and is used to supply multi-element gas to the triaxial clamping assembly (1); Temporary storage chamber (2), connected to the gas outlet, is used to receive and temporarily store the gas flowing out from the triaxial clamping assembly (1); The detector (3) is located on the side of the temporary storage chamber (2) and is used to detect the concentration of each gas component in the temporary storage chamber (2) in real time. The gas supply component (5) can supply oxygen, inert gas and tracer gas; the detector (3) detects the generated concentration data for analyzing the adsorption and replacement mechanism of the inert gas in the loaded crushed coal.

2. The experimental system for multi-element gas injection adsorption-displacement of crushed coal based on intelligent sensors according to claim 1, characterized in that, The triaxial clamping assembly (1) includes at least: outer cylinder; A first plug (11) is provided at one end of the outer cylinder, and the first plug (11) is provided with a first flow channel (14) as the air outlet. The second plug (12) is located at the other end of the outer cylinder, and the second plug (12) is provided with a second flow channel (15) serving as the air inlet. The ring cylinder (13) is fitted between the first plug (11) and the second plug (12), and together with the first plug (11) and the second plug (12), forms a chamber for containing the sample and applying pressure.

3. The experimental system for multi-element gas injection adsorption-displacement of crushed coal based on intelligent sensors according to claim 2, characterized in that, The second plug (12) is provided with a flow channel switching component (16), the flow channel switching component (16) including: A flow channel seat (161) is disposed in the second plug (12), and a central flow channel (162) is provided in the middle, the central flow channel (162) being connected to the second flow channel (15); The accommodating space is located in the middle of the flow channel seat (161) and is connected to the central flow channel (162); A flow channel (163) is provided on one side of the flow channel seat (161) and connects to the accommodating space. The flow channel (163) extends through the second plug (12). The switching plate (164) is slidably disposed within the accommodating space; Telescopic rod (166), driven connection to the switching plate (164), used to drive the switching plate (164) to move; The switching plate (164) has a central receiving groove on one side and a diversion hole (165) on the other side corresponding to the diversion channel (163) and communicating with the central receiving groove. The movement of the switching plate (164) can selectively connect the diversion hole (165) to the central channel (162) and the diversion channel (163), or only make the central channel (162) unobstructed.

4. The experimental system for multi-element gas injection adsorption-displacement of crushed coal based on intelligent sensors according to claim 3, characterized in that, A pressure relief valve is provided in the diversion channel (163).

5. The experimental system for multi-element gas injection adsorption-displacement of crushed coal based on intelligent sensors according to claim 1, characterized in that, The gas supply assembly (5) includes: An air supply cylinder (51) has one end for connecting an oxygen source and an inert gas source; The flow control chamber (52) is connected to the other end of the air supply cylinder (51); A connector (53) is connected to the end of the flow control chamber (52) away from the air supply cylinder (51) and is used to communicate with the air inlet end; A gas cylinder (55) is used to store tracer gas and is connected to the flow control chamber (52). A flow sensor (54) is disposed on the connector (53) for monitoring the flow rate of the mixed gas flowing through the connector (53), and its monitoring signal is used to regulate the gas supply.

6. The experimental system for multi-element gas injection adsorption-displacement of crushed coal based on intelligent sensors according to claim 5, characterized in that, The flow control chamber (52) is equipped with a venturi tube (521); The gas cylinder (55) is connected to the throat of the venturi tube (521), and the gas cylinder (55) is provided with: A ring (551) is fixed to the inner wall of the gas tank (55), and the inner surface of the ring (551) is a downwardly inclined conical surface; The slide bar (553) is set to slide vertically; A conical plug (552) is fixed to the bottom end of the slide rod (553). The conical surface of the conical plug (552) cooperates with the conical surface of the ring stop (551) to control the opening degree of the gas tank (55) to the throat of the venturi tube (521). A spring is connected between the slide rod (553) and the ring stop (551); A support rod (554) is fixed to the bottom of the conical plug (552); A cam (524) is rotatably provided inside the throat of the venturi tube (521). The working surface of the cam (524) abuts against the bottom end of the support rod (554) to drive the support rod (554) to rise and fall.

7. The experimental system for multi-element gas injection adsorption-displacement of crushed coal based on intelligent sensors according to claim 6, characterized in that, The cam (524) is rotatably connected to the venturi tube (521) via a rotating shaft (58), the rotating shaft (58) extending out of the venturi tube (521) and hinged to one end of the connecting rod (57); The other end of the connecting rod (57) is hinged to the piston rod of the telescopic cylinder (56); The cylinder body of the telescopic cylinder (56) is hinged to one side of the flow control chamber (52).

8. The experimental system for multi-element gas injection adsorption-displacement of crushed coal based on intelligent sensors according to claim 6, characterized in that, A follower rod (525) is also hinged to the cam (524); a piston (523) is hinged to the other end of the follower rod (525); the piston (523) is sealed and slidably disposed in the bottom chamber (522); the bottom chamber (522) is connected to the lower throat of the venturi tube (521).

9. The experimental system for multi-element gas injection adsorption-displacement of crushed coal based on intelligent sensors according to claim 1, characterized in that, Also includes: A vacuum suction chamber (4) is located at the bottom of the temporary storage chamber (2) and is connected to the temporary storage chamber (2) for evacuating the temporary storage chamber (2) to promote the flow of gas out of the triaxial clamping assembly (1).

Images