Hydrotalcite-based gas explosion suppression application method based on catalytic weakening mechanism

Abstract

This invention provides a hydrotalcite-based gas explosion suppression method based on a catalytic weakening mechanism, relating to the field of gas disaster prevention and control technology. The method includes: preparing a hydrotalcite-based explosion suppression material, wherein the hydrotalcite-based explosion suppression material contains surface active sites for targeted inactivation of key free radicals generated by gas explosions; processing the morphology of the hydrotalcite-based explosion suppression material; obtaining the gas concentration in a gas-explosive zone; and controlling the release and dispersion of the hydrotalcite-based explosion suppression material according to the gas concentration; the key free radicals generated by the gas explosion are targeted and inactivated by the surface active sites in the hydrotalcite-based explosion suppression material to achieve gas explosion suppression. This improves the effectiveness of gas explosion prevention and control.

Description

Technical Field

[0001] This invention relates to the field of gas disaster prevention and control technology, specifically to a hydrotalcite-based gas explosion suppression application method based on a catalytic weakening mechanism; it also involves the interdisciplinary application of materials science, explosion dynamics, and safety science. Background Technology

[0002] Gas explosions are a major disaster in underground engineering fields such as coal mines, seriously threatening safe production and the lives of personnel. Existing gas explosion suppression technologies are mostly based on physical interception as their core principle, such as using dry powder, inert gas, porous media, etc., to achieve explosion suppression by physical means such as blocking flame propagation, reducing oxygen concentration, and absorbing the heat of the explosion.

[0003] However, existing physical explosion suppression technologies have significant drawbacks: First, they only passively intervene in the explosion propagation stage and cannot block the free radical chain reaction of gas explosions at the source. When faced with deep, high-concentration, and high-pressure gas explosions, the explosion suppression efficiency drops significantly. Second, the mechanism of action of explosion suppression materials is singular, and they have no targeted inhibition effect on key active free radicals such as ·OH, ·H, and ·CH3 generated during the explosion process, making it difficult to achieve source control of the explosion. Third, existing chemical explosion suppression technologies are still in their early stages and lack functional materials that can precisely control the surface and interface properties and achieve targeted inactivation of free radicals. The technological gap in controlling the explosion chain reaction at the microscopic level urgently needs to be filled.

[0004] While some functional materials have been attempted for application in gas explosion suppression in existing technologies, they generally suffer from problems such as uncontrollable material structure, low quenching efficiency for free radicals, and poor adaptability to complex explosion environments, failing to meet the actual needs of deep gas control. Related technologies mostly focus on optimizing the performance of physical explosion suppression materials, without providing relevant chemical explosion suppression solutions based on catalytic weakening mechanisms. Summary of the Invention

[0005] To address the technical problems of existing gas explosion suppression technologies, which mainly rely on physical interception and cannot block free radical chain reactions at the source, and lack targeted chemical explosion suppression materials with precisely controllable surface and interface properties, resulting in low explosion suppression efficiency and poor adaptability in deep gas control, this invention provides a hydrotalcite-based gas explosion suppression application method based on a catalytic weakening mechanism to solve the aforementioned problems of existing technologies.

[0006] To achieve the above objectives, this invention proposes a hydrotalcite-based gas explosion suppression application method based on a catalytic weakening mechanism, comprising: Prepare hydrotalcite-based explosion suppression material, wherein the hydrotalcite-based explosion suppression material has surface active sites that target and inactivate key free radicals generated by gas explosions; The hydrotalcite-based explosion suppression material undergoes material morphology processing; In areas prone to gas explosion, the gas concentration is obtained, and the release and dispersion of hydrotalcite-based explosion-suppressing materials are controlled according to the gas concentration. The key free radicals generated by the gas explosion are targeted and inactivated by the active sites on the surface of the hydrotalcite-based explosion suppression material to achieve gas explosion suppression.

[0007] Optionally, the hydrotalcite-based explosion suppressant material is prepared by a hydrothermal synthesis method; wherein the process parameters of the hydrothermal synthesis method include: reaction temperature 25-150℃, system pH value 8.0-10.0, reaction time 6-24h, and the specific surface area of ​​the hydrotalcite-based explosion suppressant material is 200-300m². 2 / g, with the interlayer spacing adjustable in the range of 0.7-2.0nm.

[0008] Optionally, the hydrotalcite-based explosion suppressant material has a layered structure, in which different layer metal elements and interlayer anions are disposed; the layer metal elements include Mg, Al, Fe, and Co; the interlayer anion type includes CO3. 2- Cl - and NO3 - .

[0009] Optionally, the hydrotalcite-based explosion suppressant material is released through a release device, wherein the release method of the release device includes atomized spraying, dry powder spraying, or airflow delivery.

[0010] Optionally, during release dispersion, the on-site dispersion concentration of the hydrotalcite-based explosion suppressant is 5-20 g / m³. 3 .

[0011] Optionally, during the release and dispersion process, the hydrotalcite-based explosion suppressant material is compounded with a physical explosion suppressant material, and the compounded material is released and dispersed; wherein the physical explosion suppressant material includes an inert gas and sodium bicarbonate dry powder.

[0012] Optionally, the mass ratio between the hydrotalcite-based explosion suppressant material and sodium bicarbonate dry powder is 1:3-3:1.

[0013] Optionally, after preparing the hydrotalcite-based explosion suppressant material, the hydrotalcite-based explosion suppressant material is further combined with montmorillonite and a mesoporous silica porous carrier.

[0014] Optionally, the gas-explosive zone includes coal mine working faces, gas accumulation areas, gas drainage pipelines, and coal mine roadways, and is suitable for deep gas environments with high concentrations of 8%-16% and high pressures of 0.1-0.5 MPa.

[0015] On the other hand, the present invention provides a hydrotalcite-based gas explosion suppression application system based on a catalytic weakening mechanism for performing the above-described method.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention utilizes the unique structural advantages of hydrotalcite (LDHs) layers, which are atomically tunable and have a highly controllable interfacial microenvironment, to construct an active intervention strategy for catalytically weakening the evolution of free radicals. This achieves targeted inactivation of key free radicals in gas explosions, actively blocking the continuous transmission of the explosion chain reaction from the source. It solves the technical problem of controlling high-concentration, high-pressure gas in deep environments and fills the gap in the field of micro-control of existing chemical explosion suppression technologies, thereby improving the scientific nature and effectiveness of gas explosion control. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. In the drawings: Figure 1 This is a schematic diagram of the process of the hydrotalcite-based gas explosion suppression material based on the catalytic weakening mechanism in an embodiment of the present invention; Figure 2 This is a schematic diagram of the hydrotalcite-based gas explosion suppression principle based on the catalytic weakening mechanism in an embodiment of the present invention; Figure 3 This is the complete process from preparation to field application of the hydrotalcite-based explosion suppression material in this embodiment of the invention. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] This embodiment proposes a hydrotalcite-based gas explosion suppression application method based on a catalytic weakening mechanism, such as... Figure 1 As shown, it includes the following steps: (1) Preparation of hydrotalcite-based explosion suppression material: Based on the structural characteristics of key free radicals in gas explosion, the composition of metal elements in the layers of hydrotalcite, the type of anions between layers, the grain size, the spacing between layers and the specific surface area are controlled to construct active sites on the surface and interface, and hydrotalcite-based explosion suppression material with the ability to target and inactivate ·OH, ·H and ·CH3 free radicals is prepared. (2) Material morphology processing: The hydrotalcite-based explosion suppression material is processed into powder, microspheres, coatings or composite porous structures to adapt to the on-site application scenarios of gas control; (3) Intelligent release application: A gas concentration monitoring system and a hydrotalcite-based explosion suppression material release device are set up in the gas-explosive area. The two are linked and controlled. When the gas concentration reaches the lower explosion limit threshold, the release device disperses the hydrotalcite-based explosion suppression material in the gas accumulation space, so that the material and the gas are fully mixed. (4) Catalytic explosion suppression: The key free radicals generated by the gas explosion undergo a catalytic quenching reaction with the active sites on the surface of the hydrotalcite-based explosion suppression material. The free radicals are targeted and inactivated, blocking the free radical chain reaction of the gas explosion from the source, thus achieving gas explosion suppression.

[0020] Specifically, in step (1), hydrothermal synthesis or co-precipitation method is used to prepare the hydrotalcite-based explosion suppressant material. The synthesis process parameters include: reaction temperature 25-150℃, system pH value 8.0-10.0, reaction time 6-24h, and the specific surface area of ​​the hydrotalcite-based explosion suppressant material is 200-300m². 2 / g, with the interlayer spacing adjustable in the range of 0.7-2.0nm.

[0021] Specifically, in step (1), the layer metal elements of the hydrotalcite are one or more combinations of Mg, Al, Fe, and Co, and the interlayer anion is CO3. 2- Cl - NO3 - One or more combinations thereof.

[0022] Specifically, in step (3), the release method of the release device is atomized spraying, dry powder spraying, or airflow delivery, and the on-site dispersion concentration of the hydrotalcite-based explosion suppressant material is 5-20 g / m³. 3 .

[0023] The application method for hydrotalcite-based gas explosion suppression also includes the following steps: (5) Construction of synergistic explosion suppression system: The hydrotalcite-based explosion suppression material is combined with one or two of the following: inert gas and sodium bicarbonate dry powder to construct a synergistic explosion suppression system of "chemical catalysis + physical interception".

[0024] Specifically, when hydrotalcite-based explosion suppressant materials are compounded with dry powder, the mass ratio of the two is 1:3 to 3:1.

[0025] Specifically, in step (1), the hydrotalcite-based explosion suppressant material can be combined with montmorillonite and mesoporous silica porous carrier to improve the adsorption performance and recyclability of the material.

[0026] Specifically, the gas-explosive areas mentioned in step (3) include coal mine working faces, gas accumulation areas, gas extraction pipelines, and coal mine roadways, and are suitable for deep gas environments with high concentrations of 8%-16% and high pressures of 0.1-0.5MPa.

[0027] Specifically, the material has an atomically tunable layered structure and a highly controllable interfacial microenvironment, achieving an inactivation efficiency of over 85% for key free radicals in gas explosions.

[0028] On the other hand, the present invention also provides a hydrotalcite-based gas explosion suppression system, including a gas concentration monitoring probe, an explosion suppression material release device linked to the monitoring probe, and the aforementioned hydrotalcite-based explosion suppression material filled in the release device. The release device can realize the intelligent and precise release of the hydrotalcite-based explosion suppression material according to the gas concentration signal.

[0029] The above technical solution is described in detail below: To address the technical problems of existing gas explosion suppression technologies, which mainly rely on physical interception and cannot block free radical chain reactions at the source, and lack targeted chemical explosion suppression materials with precisely controllable surface and interface properties, resulting in low explosion suppression efficiency and poor adaptability in deep gas control, this invention provides a hydrotalcite-based gas explosion suppression application method based on a catalytic weakening mechanism.

[0030] like Figure 2 As shown, Figure 2 The core explosion suppression principle was demonstrated. The gas concentration monitoring probe monitors the gas concentration in real time. When the concentration reaches a threshold, it triggers the explosion suppression material release device to release the hydrotalcite-based explosion suppression material. The hydrotalcite-based explosion suppression material has a controllable layered structure and active sites on the surface. When a gas explosion generates key free radicals, the free radicals undergo a catalytic reaction with the active sites in the catalytic quenching reaction zone, and the free radicals are targeted and inactivated. The source of the explosion chain reaction is blocked in the free radical chain reaction blocking zone, ultimately achieving the gas explosion suppression effect.

[0031] like Figure 3 As shown, Figure 3 The demonstration showcases the complete process of hydrotalcite-based explosion suppression materials from preparation to field application. After the raw material preparation unit completes the preparation of raw materials such as metal salts and alkali solutions, they are sent to the hydrotalcite synthesis unit for synthesis. After precise modification by the surface and interface property control unit, the finished product is obtained. The finished product is processed into multi-form explosion suppression materials by the material morphology processing unit. It can be compounded with inert gas / dry powder through the synergistic explosion suppression system compounding unit. Finally, it is matched with an intelligent release device by the field application adaptation unit to realize gas explosion suppression application in gas control sites.

[0032] This invention utilizes the unique structural advantages of hydrotalcite (LDHs) layers, which are atomically tunable and have a highly controllable interfacial microenvironment, to construct an active intervention strategy for catalytically weakening the evolution of free radicals. This achieves targeted inactivation of key free radicals in gas explosions, actively blocking the continuous transmission of the explosion chain reaction from the source. It solves the technical problem of controlling high-concentration, high-pressure gas in deep environments and fills the gap in the field of micro-control of existing chemical explosion suppression technologies, thereby improving the scientific nature and effectiveness of gas explosion control.

[0033] The hydrotalcites (LDHs) described in this invention are layered double hydroxides, a class of anionic clay minerals with a layered structure.

[0034] To achieve the aforementioned objectives, this invention employs the following technical solution. Its core is to precisely control the surface and interface properties of hydrotalcite, endowing it with the ability to catalytically quench key free radicals in gas explosions. This, in turn, enables the source suppression of gas explosions through specific application methods. The specific technical solution is as follows: (1) Precise preparation of hydrotalcite-based explosion suppression materials: Based on the structural characteristics of key active free radicals (·OH, ·H, ·CH3) during gas explosions, a hydrothermal synthesis method was used to control the elemental composition of the layered metals (such as Mg, Al, Fe, Co, etc.) and the type of interlayer anions (such as CO3) in hydrotalcite. 2- Cl - NO3 - By controlling the grain size and other parameters, the active sites on the surface of hydrotalcite were directionally constructed. By adjusting the synthesis temperature, pH value, reaction time and other process parameters, the interlayer spacing and specific surface area of ​​hydrotalcite were precisely controlled, and its adsorption and catalytic performance for key free radicals were optimized. Hydrotalcite-based explosion suppression materials with the ability to target and inactivate free radicals were prepared. This material can react with key free radicals of explosion through the active sites on the surface, causing the free radicals to lose their activity, thereby weakening the evolution and transmission of free radicals.

[0035] As an optional embodiment, when preparing hydrotalcite-based explosion suppressant materials, a co-precipitation method can be used instead of a hydrothermal synthesis method. By controlling parameters such as the drop rate of the precipitant and the aging time, the surface and interface properties of hydrotalcite can be precisely controlled, achieving the same free radical targeted inactivation effect.

[0036] As an optional embodiment, the hydrotalcite-based explosion suppression material can be combined with porous carriers such as montmorillonite and mesoporous silica to improve the material's adsorption performance and recyclability, making it suitable for long-term gas control scenarios. (2) Morphological adaptation of hydrotalcite-based explosion suppression materials: Based on the field application scenarios of gas control (such as coal mine roadways, gas extraction pipelines, confined spaces, etc.), the prepared hydrotalcite-based explosion suppression material is processed into powder, microspheres, coatings, or composite porous structures: the powder form is suitable for rapid atomization spraying in the early stage of gas explosion, the microsphere form improves the dispersibility and stability of the material, the coating form can adhere to the roadway wall and pipeline inner wall to achieve long-term explosion suppression, and the composite porous structure can combine the dual advantages of physical interception and chemical catalysis to further improve the explosion suppression efficiency.

[0037] (3) Application of hydrotalcite-based gas explosion suppression: In areas prone to gas explosions (such as coal mining faces and gas accumulation zones), release devices for hydrotalcite-based explosion suppressants are installed and controlled in conjunction with a gas concentration monitoring system. When the gas concentration reaches the lower explosion limit, the release device quickly disperses the hydrotalcite-based explosion suppressant into the gas accumulation space via atomization, powder spraying, or airflow, ensuring thorough mixing between the material and the gas. When a gas explosion occurs and initial free radicals are generated, the active sites on the surface of the hydrotalcite-based material immediately undergo catalytic quenching reactions with key free radicals such as ·OH, ·H, and ·CH3, targeting and inactivating the active free radicals. This blocks the free radical chain reaction of the gas explosion at its source, achieving active and efficient suppression of the explosion.

[0038] As an optional embodiment, the release device can use a directional spraying method instead of a global dispersion method, which is suitable for precise control of local gas accumulation and reduces material consumption.

[0039] (4) Synergistic optimization of the explosion suppression system: Hydrotalcite-based explosion suppression materials can be compounded with inert gases (N2, CO2) or high-efficiency dry powder to construct a synergistic explosion suppression system of "chemical catalysis + physical interception": the hydrotalcite-based materials catalyze and weaken the evolution of free radicals at the microscopic level, while the inert gases / dry powders block flame propagation and reduce oxygen concentration at the macroscopic level. The synergistic effect of the two further enhances the gas explosion suppression effect under complex working conditions.

[0040] The hydrotalcite-based gas explosion suppression method of the present invention, based on the catalytic weakening mechanism, leverages the structural advantages and catalytic performance of hydrotalcite-based materials to achieve source control of gas explosions. Compared with existing technologies, it has the following significant technical, safety, and application effects: (1) Core technology effect: It breaks through the passive intervention mode of traditional physical explosion suppression and achieves active prevention and control of gas explosion from the free radical chain quenching path. The inactivation efficiency of hydrotalcite-based materials for key free radicals (·OH, ·H, ·CH3) of gas explosion can reach more than 85%, which can effectively block the continuous transmission of the explosion chain reaction. Even in the deep high concentration (gas concentration 8%-16%) and high pressure (0.1-0.5MPa) gas environment, the explosion suppression success rate can still reach more than 90%, which is far superior to traditional physical explosion suppression materials. (2) Material performance: The surface and interface characteristics of hydrotalcite-based explosion suppression materials can be precisely controlled at the atomic level, and they can be customized according to different gas explosion conditions. The specific surface area of ​​the material can reach 200-300 m². 2 / g, the interlayer spacing is adjustable in the range of 0.7-2.0nm, the adsorption and catalytic performance of free radicals is controllable, and the material has good chemical stability. It can still maintain good explosion suppression effect in the complex environment of high humidity and high dust in coal mines. (3) Application adaptability: The material can be processed into various forms such as powder, microspheres, and coatings. The release device is linked with the gas concentration monitoring system to achieve intelligent and precise release. It is suitable for different application scenarios such as coal mine roadways, gas extraction pipelines, and mining faces. It can achieve rapid explosion suppression in the early stage of explosion, and can also achieve long-term gas control through coating. It is easy to operate and has wide applicability. (4) Synergistic effect: The constructed “chemical catalysis + physical interception” synergistic explosion suppression system combines the dual advantages of micro-free radical inactivation and macro-flame blocking. Compared with single explosion suppression technology, the explosion suppression efficiency is improved by more than 30%, which can cope with more complex deep gas explosion risks; and provides a mature hydrotalcite-based material gas explosion suppression application system.

[0041] (5) Industrial and safety effects: The raw materials for preparing the hydrotalcite-based material used in this invention are readily available and the synthesis process is simple. The production cost is reduced by more than 40% compared with traditional high-end chemical explosion suppression materials, making it easy to scale up production and engineering applications. At the same time, it blocks gas explosions from the source, greatly reducing the probability and severity of gas explosion accidents, and improving the safety production level of underground projects such as coal mines, with significant safety benefits. (6) Interdisciplinary effect: This method promotes the interdisciplinary innovation of safety science, materials science and explosion dynamics, fills the gap in the field of micro-control of existing chemical explosion suppression technology, and provides new ideas and methods for the development of gas disaster prevention and control technology. It has important scientific value and technology promotion value.

[0042] The following is a description of relevant embodiments of the above technical solution: Example 1: Preparation of hydrotalcite-based powder materials and their application in suppressing gas explosions in coal mine roadways (1) Preparation of hydrotalcite-based powder explosion suppression material Mg(NO3)2·6H2O and Al(NO3)3·9H2O were selected as the metal raw materials for the layers, Na2CO3 as the interlayer anionic raw material, and NaOH as the precipitant. A 0.5 mol / L mixed solution of metal salts was prepared according to a Mg / Al molar ratio of 3:1. The ratio of n(NaOH):n(total metal ions) was 2:1, and the ratio of n(Na2CO3):n(Al) was 1:1. 3+ A 0.5:1 ratio of alkaline solution to metal salt solution was prepared. At room temperature and a stirring rate of 500 rpm, the alkaline solution was added dropwise to the metal salt solution, adjusting the pH to 9.0. After the addition was complete, stirring continued for 30 minutes. The mixture was then transferred to a hydrothermal reactor and reacted at 120°C for 24 hours. After the reaction, the mixture was cooled to room temperature, centrifuged, washed, vacuum dried at 60°C for 12 hours, and ground through a 200-mesh sieve to obtain a Mg-Al hydrotalcite-based powder explosion suppressant material with a specific surface area of ​​256 m². 2 / g, with a layer spacing of 0.89nm.

[0043] (2) On-site application device setup In a coal mine's longwall mining roadway (500m long, 12m cross-section) 2 Three sets of explosion suppression systems are set up in the gas accumulation area. Each system includes a gas concentration monitoring probe (detection accuracy 0.01%), an atomized spray release device and a storage tank. The storage tank is filled with the above-mentioned Mg-Al hydrotalcite-based powder explosion suppression material. The monitoring probe and the release device are linked. The release device is triggered when the gas concentration reaches 5% (60% of the lower explosive limit).

[0044] (3) Gas explosion suppression implementation process When the methane concentration in the tunnel reaches 5% due to accumulation, the methane concentration monitoring probe immediately sends a signal to trigger the atomizing spray release device. The release device atomizes the hydrotalcite-based powder explosion-suppressing material using a high-pressure airflow at a concentration of 10g / m³. 3 The concentration of the powder is dispersed in the gas accumulation space of the tunnel, so that the powder material is fully mixed with the gas. When the initial gas explosion is triggered by the fire source in the tunnel and key free radicals such as ·OH, ·H, and ·CH3 are generated, the active sites on the surface of the hydrotalcite-based powder undergo rapid catalytic quenching reaction with the free radicals, targeting and inactivating the active free radicals, blocking the transmission of the explosion chain reaction from the source, and finally achieving effective suppression of gas explosion. In this test, there was no flame propagation and no pressure surge, and the explosion suppression success rate was 100%.

[0045] Example 2: Preparation of hydrotalcite-based coating material and its long-term explosion suppression application in gas extraction pipelines (1) Preparation of hydrotalcite-based coating explosion suppression material Fe-Mg-Al ternary hydrotalcite was prepared by co-precipitation method: Fe(NO3)3·9H2O, Mg(NO3)2·6H2O, and Al(NO3)3·9H2O were prepared into a metal salt solution in a molar ratio of 1:2:1. NH3·H2O was used as the precipitant, and the precipitant was added dropwise under stirring until the pH of the system reached 8.5. After aging for 6 hours, the solution was centrifuged, washed, and dried to obtain Fe-Mg-Al hydrotalcite powder. The hydrotalcite powder was mixed with waterborne epoxy resin at a mass ratio of 3:7, and appropriate amounts of dispersant and curing agent were added. The mixture was stirred evenly to obtain a hydrotalcite-based coating slurry.

[0046] (2) Coating application and pipeline compatibility The above-mentioned coating slurry was applied to the inner wall of the gas drainage pipeline using high-pressure spraying. The coating thickness was controlled at 0.5 mm, and it was cured at room temperature for 24 hours to form a dense, highly adhesive hydrotalcite-based explosion-suppressing coating. The inner diameter of the pipeline after coating was 300 mm, suitable for a gas drainage flow rate of 50 m³ / h. 3 Operating conditions: / min.

[0047] (3) Long-term explosion suppression effect The gas drainage pipeline coated with hydrotalcite-based coating was applied to a coal mine gas drainage system. The gas concentration in the pipeline was maintained at 10%-12% for a long period of time. The coating continuously catalyzes and inactivates trace amounts of key free radicals generated by local combustion and explosion in the pipeline through the active sites on the surface, effectively preventing gas explosions caused by the accumulation of free radicals. After 6 months of continuous application, the coating did not peel off or pulverize, and the inactivation efficiency of free radicals remained above 80%, achieving long-term explosion suppression of the gas drainage pipeline. No gas combustion and explosion accidents occurred during the period.

[0048] Example 3: Preparation of hydrotalcite-based composite system and its application in suppressing explosions in deep high-pressure gas systems. (1) Preparation of hydrotalcite-dry powder composite explosion suppression system The Mg-Al hydrotalcite-based powder prepared in Example 1 was mixed with sodium bicarbonate dry powder at a mass ratio of 2:3. The mixture was then uniformly mixed by mechanical ball milling (milling rate 300 r / min, milling time 1 h) to obtain a hydrotalcite-dry powder composite explosion suppression system, which has the dual functions of chemical catalytic quenching of free radicals and physical heat absorption and flame blocking.

[0049] (2) Application of deep gas control A smart gas release device was installed at a deep tunneling face in a coal mine (800m depth, 0.4MPa gas pressure). The device was filled with the aforementioned hydrotalcite-dry powder composite explosion suppression system. The device was set to trigger when the gas concentration reached 6%, with a release concentration of 15g / m³. 3When the initial gas explosion is triggered by the ignition source generated by the blasting at the working face, the hydrotalcite powder in the composite explosion suppression system rapidly catalyzes and inactivates the key free radicals of the explosion, while the sodium bicarbonate dry powder decomposes upon heating, absorbs heat, and releases CO2, blocking flame propagation and reducing oxygen concentration. The two work synergistically to quickly block the chain reaction and flame propagation of deep high-pressure gas explosions. The test results show that the peak explosion pressure is reduced by 75% and the flame propagation speed is reduced to 0, achieving highly efficient suppression of deep high-pressure gas explosions.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for gas explosion suppression based on catalytic weakening mechanism of hydrotalcite, characterized in that, include: Prepare hydrotalcite-based explosion suppression material, wherein the hydrotalcite-based explosion suppression material has surface active sites that target and inactivate key free radicals generated by gas explosions; The hydrotalcite-based explosion suppression material undergoes material morphology processing; In areas prone to gas explosion, the gas concentration is obtained, and the release and dispersion of hydrotalcite-based explosion-suppressing materials are controlled according to the gas concentration. The key free radicals generated by the gas explosion are targeted and inactivated by the active sites on the surface of the hydrotalcite-based explosion suppression material to achieve gas explosion suppression.

2. The method according to claim 1, characterized in that, The water-sliding layer-based explosion suppression material is prepared by a hydrothermal synthesis method; wherein the process parameters of the hydrothermal synthesis method include: reaction temperature 25-150 DEG C, system pH value 8.0-10.0, reaction time 6-24h, and the specific surface area of the water-sliding layer-based explosion suppression material is 200-300m 2 / g, and the interlamellar spacing regulation range is 0.7-2.0nm.

3. The method according to claim 1, characterized in that, The water-sliding stone-based explosion suppression material is a layer plate structure, and different layer plate metal elements and interlayer anions are arranged in the layer plate structure; the layer plate metal elements include Mg, Al, Fe and Co; and the interlayer anion types include CO3 2- , Cl - and NO3 - .

4. The method according to claim 1, characterized in that, The hydrotalcite-based explosion suppressant material is released through a release device, wherein the release method of the release device includes atomized spraying, dry powder spraying, or airflow delivery.

5. The method according to claim 1, characterized in that, In the release dispersion, the in-situ dispersion concentration of the hydrotalcite-based explosion suppression material is 5-20 g / m 3 .

6. The method according to claim 1, characterized in that, During the release and dispersion process, the hydrotalcite-based explosion suppressant material is compounded with the physical explosion suppressant material, and the compounded material is released and dispersed; wherein the physical explosion suppressant material includes inert gas and sodium bicarbonate dry powder.

7. The method according to claim 6, characterized in that, The mass ratio between the hydrotalcite-based explosion suppressant material and sodium bicarbonate dry powder is 1:3-3:

1.

8. The method according to claim 1, characterized in that, After preparing the hydrotalcite-based explosion suppressant material, the hydrotalcite-based explosion suppressant material is further combined with montmorillonite and a mesoporous silica porous carrier.

9. The method according to claim 1, characterized in that, The gas-explosive areas include coal mining faces, gas accumulation zones, gas extraction pipelines, and coal mine roadways, and are suitable for deep gas environments with high concentrations of 8%-16% and high pressures of 0.1-0.5 MPa.

10. A hydrotalcite-based gas explosion suppression application system based on catalytic weakening mechanism, characterized in that, Used to perform the method described in any one of claims 1-9.

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