30 results about "Coal spontaneous combustion" patented technology

This invention discloses a high-temperature detection, early warning, and fire prevention and extinguishing system for coal mine goaf areas, relating to the field of coal mine safety monitoring technology. It includes an environmental sensing module, a data processing module, a fire prevention module, and a fire extinguishing module. The environmental sensing module is used to detect and collect environmental data within the coal mine in real time. The data processing module is used to observe CO distribution, analyze the CO concentration distribution patterns in different areas, and, combined with temperature, locate the high-temperature zone of spontaneous combustion point in the goaf area, determining the early warning level. When the early warning level is primary, the fire prevention module is activated; when the early warning level is not primary, fire extinguishing slurry or inert gas is injected into the high-temperature area. This invention can improve the fire prevention and control level in coal mine goaf areas and ensure coal mine production safety.

The application discloses a coal bunker spontaneous combustion prediction and visual monitoring system and method, relates to the field of coal bunker storage, and comprises a monitored coal bunker, an experimental coal bunker, a heating device for heating the inside of the experimental coal bunker, a sensing assembly for monitoring the inside and the outer wall state of the experimental coal bunker, a data acquisition module connected with the sensing assembly, a processing device connected with the data acquisition module, and a display device for displaying processing results. The application is used to solve the problems of obvious lag in the monitoring of the coal bunker in the prior art and low prediction accuracy of coal spontaneous combustion, realize the mapping corresponding relationship between the internal multi-field coupling physical field and the external bunker wall monitoring point in the coal bunker spontaneous combustion process, and provide a powerful guarantee for the safe operation of the coal bunker.

This application discloses a high-temperature carbonized expandable gel foam and its preparation method, belonging to the field of fire prevention and extinguishing technology. The gel foam consists of 1-10% by mass of an expandable flame-retardant system, 0.81% by mass of a foaming system, 1.385% by mass of a gel system, and deionized water. The expandable flame-retardant system uses phytic acid as the acid source, gelatin as the gas source, and glucose as the carbon source. The foaming system is obtained by compounding lauramidopropyl betaine and alkyl glycosides. The gel system is prepared from sodium alginate, pectin, and L-calcium lactate. Sodium alginate and pectin can form a stable gel network with L-calcium lactate, ensuring the structural stability and long-lasting coverage of the foam at room temperature. In the expandable flame-retardant system, the acid source releases acidic groups at high temperatures, catalyzing the dehydration and carbonization of the carbon source to form a carbon skeleton. The gas source decomposes and produces gas, driving the skeleton to expand into a dense carbon layer, achieving oxygen and heat insulation. This gel foam rapidly covers the coal body at room temperature to isolate oxygen, and expands and retards at high temperatures, achieving the effect of inhibiting spontaneous combustion of coal.

The application discloses a goaf coal spontaneous combustion three-dimensional dynamic numerical simulation method during working face advancing, relates to the technical field of coal spontaneous combustion three-dimensional dynamic numerical simulation, and comprises the following steps: based on the region of the coded identification, combining the three-dimensional disturbance offset track and the ventilation reverse distribution characteristics in the structure of the boundary disturbance, generating the boundary form uncertainty description body, and determining the boundary form uncertainty grade under the condition of local collapse of the goaf boundary space structure in the advancing process according to the space offset amplitude, disturbance duration and coupling strength in the boundary form uncertainty description body. The application introduces multi-source disturbance identification, boundary form uncertainty quantification, oxygen diffusion dynamic adjustment and oxygen consumption linkage feedback mechanism, realizes the synchronous update of the oxygen diffusion parameters and the coal oxidation reaction process under the boundary mutation condition, and thus improves the accuracy and reliability of the goaf coal spontaneous combustion three-dimensional dynamic numerical simulation.

The application discloses a kind of proportion optimization and thermal stability test method of nano composite resistance gel foam material, and relates to the field of coal mine safety technology.The application includes: preparation of modified antioxidant and nano composite resistance gel foam material;The initial addition amount of gelling agent, crosslinking agent, foaming agent, foam stabilizer, nano SiO2 and modified antioxidant is sequentially optimized using single factor method;Using single factor optimization result as base point, six-factor quadratic regression model is constructed using Box-Behnken response surface method, to determine the global optimal proportion;Establish the thermal stability test method of 20-200 DEG C temperature gradient and 10-50 times foaming multiple coordination, to determine the half-life under each condition.The coal sample intersection temperature reaches 164.81 DEG C by two-step optimization strategy, the resistance rate is not less than 85%, and the half-life reaches 14 days;Thermal stability test method is in line with actual working condition of goaf, which can guide on-site construction parameter adjustment, and is used for prevention and control of coal spontaneous combustion in goaf.

This application relates to the field of coal mine safety technology, and provides a method and system for identifying complex hazard zones in gas-bearing goafs under the combined effects of coal and oxygen. The method first constructs a multi-field coupled model of "thermal-solid-gas" in the gas-bearing goaf, which includes mutually coupled gas concentration fields, air flow fields, oxygen concentration fields, gas temperature fields, and solid temperature fields. Then, the multi-field coupled model is numerically solved to obtain the spatial distribution characteristics of the temperature field, gas concentration field, and oxygen concentration field within the goaf. Finally, based on preset complex hazard zone identification rules and the superimposed area of ​​the temperature field, gas concentration field, and oxygen concentration field, the goaf is divided into different levels of Class I to Class IV complex hazard zones. This invention, by introducing a gas concentration field, achieves accurate identification of complex hazard zones caused by gas and coal spontaneous combustion, providing key theoretical basis and technical support for the coordinated prevention and control of complex hazards in goafs of high-gas mines.

The present application relates to the technical field of mine fire prevention and extinguishing, and provides a coal mine goaf circulating cooling and partitioned grid cooling supply fire prevention and extinguishing method and system, which comprises the following steps: collecting multi-source environment data of the goaf in real time; dividing the goaf into regions of different risk levels according to a preset oxygen concentration threshold and laying out a goaf cooling supply network; constructing a closed cycle heat exchange process, continuously preparing low-temperature cryogenic medium and delivering it to the goaf cooling supply network; identifying coal spontaneous combustion risks and locating high-temperature abnormal regions; regulating and strengthening the cooling supply pipeline and implementing targeted cooling supply of different intensities; and regulating the basic cooling supply pipeline to intermittently deliver the cryogenic medium along a preset S-shaped channel. The present application not only realizes closed recovery cooling and sustainable cooling of the cryogenic medium, but also enables the cryogenic medium to be preferentially delivered to high-temperature regions as needed to realize targeted heat exchange cooling, so that the goaf fire prevention and control is sustainable, controllable and economical.

The application discloses a kind of goaf coal spontaneous combustion intelligent monitoring and grading prevention and control device and method.Device is arranged in goaf behind coal mining face, through periodic air sampling probe detection, gas is detected in turn by temperature, CO and C2H2 sensor, and by intelligent analyzer discerns coal spontaneous combustion hazard and its grade;When not early warning, maintain normal air pumping state.When hazard occurs, implement grading prevention and control: first grade is intervened by adjusting gas extraction parameter and encrypting detection frequency;Second grade quantitatively injects low-temperature nitrogen into target area and inertizes;Third grade improves nitrogen injection amount of target device while linking adjacent device to assist nitrogen injection, expands inertization range.After hazard is eliminated, restore normal detection and record occurrence position;After device enters deep goaf, new device is re-deployed in working face and historical hazard position information is inherited, and corresponding area is pre-encrypted monitoring.The application greatly improves the pertinence and timeliness of goaf coal spontaneous combustion prevention and control, and ensures coal mine safety production.

This embodiment proposes a method, device, and equipment for detecting high-temperature points of spontaneous combustion in coal in goaf areas of coal mines, relating to the field of mining technology. The method includes: controlling phased array radar transceiver nodes to take turns as transmitters according to a preset sequence, with the remaining phased array radar transceiver nodes acting as receivers, transmitting electromagnetic waves at a preset frequency; determining the arrival time, amplitude attenuation, and phase change of the electromagnetic wave signals received in the receivers, generating multiple sets of corresponding wavefield information for the transmitter-receiver paths; determining the theoretical travel time and theoretical amplitude of each ray path in the wavefield information; establishing a corresponding forward model for electromagnetic wave propagation, and importing the wavefield information, theoretical travel time, and theoretical amplitude to generate a three-dimensional dielectric constant distribution image; and converting the three-dimensional dielectric constant distribution image into a three-dimensional temperature field distribution map based on a preset coal sample dielectric constant-temperature relationship curve. This embodiment can detect and accurately locate high-temperature potential points of spontaneous combustion in coal at an early stage.

The application provides an open pit end slope coal spontaneous combustion advanced treatment method, and belongs to the technical field of coal safe mining, and comprises the following steps: determining a coal spontaneous combustion advanced treatment width B1 according to the stability coefficient of a slope in an initial state and a preset first step length; determining a coal spontaneous combustion treatment width B2 according to the stability coefficient of the slope in the initial state and a preset second step length; when the coal spontaneous combustion advanced treatment width B1 is greater than the coal spontaneous combustion treatment width B2, then the above steps are repeated, the coal spontaneous combustion treatment width B2 is gradually increased according to the preset second step length, and when the coal spontaneous combustion advanced treatment width B1 is less than or equal to the coal spontaneous combustion treatment width B2, the final coal spontaneous combustion treatment width is determined as the current coal spontaneous combustion treatment width B2. The application can effectively use the discarded materials to replace and fill the end slope coal seam with high spontaneous combustion tendency in advance, mine a large amount of end slope coal resources, save a large amount of discarded space, and facilitate construction conditions.

This invention provides a self-healing inhibitor for suppressing coal spontaneous combustion and its application, belonging to the field of inhibitor technology. The self-healing inhibitor for suppressing coal spontaneous combustion comprises a gel-based liquid and a crosslinking agent; the gel-based liquid is prepared from the following raw materials: sodium alginate solution, gelatin, polyvinyl alcohol, and a plasticizer; the crosslinking agent is a calcium chloride-saturated borax solution. When used, the crosslinking agent of the inhibitor provided by this invention crosslinks with the gel-based liquid to form a thin film. This crosslinked film has properties such as water retention, reabsorption and swelling, and oxygen barrier, which can effectively reduce the temperature of the coal and inhibit the occurrence of coal spontaneous combustion.

The application discloses a kind of mine dynamic monitoring and spontaneous combustion analysis system based on multi-source data, it is related to coal mine safety monitoring and coal spontaneous combustion prevention and control technical field;In the present application, unified collection is carried out to gas component, temperature, air volume, pressure difference, stoping advance, surface fissure state and sampling link state data, and dynamic relative coordinate data set is established according to working face reference line distance, air return corner distance, coal seam horizon, roadway section, sampling channel and collection time sequence, then current scene label is generated in combination with surface fissure state, air volume change, pressure difference change, oxygen change direction, stoping advance state and link state mark, so that the same space object forms continuous comparable data reference in different mining stages.

The present invention relates to the field of coal mine concealed fire zone detection, in particular to a coal spontaneous combustion downhole detection system and method based on a self-potential method. The coal spontaneous combustion downhole detection system comprises a self-potential detection apparatus and a self-potential processing apparatus; the self-potential detection apparatus comprises measuring electrodes, a reference electrode and metal anchor rods; the measuring electrodes are arranged on a top plate of a goaf roadway, are fixed to the metal anchor rods, and are in wireless connection with the reference electrode through the metal anchor rods; the self-potential processing apparatus comprises a data processing sensor for processing potential data and an imaging sensor for converting data into images; and the measuring electrodes and the reference electrode are in wireless connection with the data processing sensor.

This invention proposes a device and method for preventing spontaneous combustion of coal in a coal storage silo based on the phase change of liquid carbon dioxide. The device includes a liquid carbon dioxide storage tank, a buffer tank, and a coal storage silo. The inlet of the buffer tank is connected to the outlet of the liquid carbon dioxide storage tank. Several dry ice storage tanks are connected to the inner wall of the coal storage silo. The inlets of the dry ice storage tanks are connected to the outlets of the buffer tanks. A second solenoid valve is connected to the inlet of each dry ice storage tank. Release holes are provided on the side walls of the dry ice storage tanks. The interlayer cavity of the dry ice storage tanks is filled with a phase change heat-conducting material. This invention allows the dry ice to slowly release carbon dioxide through a phase change, eliminating the risk of asphyxiation caused by large-scale carbon dioxide escape. It also reduces the frequency of directly injecting carbon dioxide into the coal storage silo. This invention can automatically control the heat transfer coefficient of the dry ice storage tanks according to the temperature of the coal storage silo, enabling precise prevention and control of spontaneous combustion of coal in the area, effectively improving the utilization rate and efficiency of carbon dioxide extinguishing agents, and reducing the fire prevention and extinguishing costs of the coal storage silo.

The application discloses a kind of utilization reverse through drilling communication high pumping roadway's fully mechanized caving face gas and coal spontaneous combustion coordinated prevention and control method.According to the development height of overburden "three zones", first weighting step distance, periodic weighting step distance and gas emission prediction result, the number and arrangement parameters of reverse drilling in return airway side slope and open-off cut are determined, so that the drilling penetrates high pumping roadway and maintains negative pressure extraction;Part of the reverse drilling is connected to the gas extraction casing, the gas in the goaf is collected, and the spontaneous combustion index gas of residual coal is detected, the gas extraction intensity is adjusted according to the coal spontaneous combustion hazard level, and inerting measures such as nitrogen injection and carbon dioxide injection are implemented.The application can improve the extraction effect of high pumping roadway during the initial mining and periodic weighting interval, significantly reduce the risk of gas accumulation in the upper corner area, and realize the coordination of gas control, gas monitoring and coal spontaneous combustion grading disposal.

The present application provides a kind of for coal spontaneous combustion early trace carbon monoxide carbon isotope detection device, belong to coal mine safety and coal spontaneous combustion monitoring technical field, including multi-way rotary valve and supply module, the input end of the multi-way rotary valve is connected with helium input module and sample introduction module respectively, the output of the multi-way rotary valve is connected with moisture removal module and CO enrichment module respectively, the output of the moisture removal module is connected with elimination module, the output of the elimination module is connected with the input of CO enrichment module, the output of the CO enrichment module is connected with CO quantitative conversion module, the supply module is connected with CO quantitative conversion module, the output of the CO quantitative conversion module is connected with conversion product purification module, the output of the conversion product purification module is connected with isotope ratio mass spectrometry module.This detection device can carry out the carbon isotope detection of ppm level even lower concentration CO in early low-temperature oxidation stage of coal spontaneous combustion.

The application provides a coal spontaneous combustion danger area monitoring and preventing system based on a communication lane sealing, which comprises three subsystems: a precise gas collection system, which uses a gas suction pump to stably extract the gas in a goaf through the communication lane sealing, so as to ensure the stability and accuracy of the gas collection; a coal spontaneous combustion danger area precise determination system, which is used for arranging temperature monitoring and gas determination devices to fully cover the large goaf through the communication lane sealing, so as to finely grade and early warn the coal spontaneous combustion danger area in the large goaf, and combine the monitoring and the prevention of the coal spontaneous combustion danger area in the goaf; and a fire preventing and extinguishing effect real-time evaluation system, which is used for monitoring the change of the gas and the temperature in the large goaf in real time at the communication lane sealing after the fire preventing and extinguishing measures are implemented, so as to reflect the fire extinguishing effect in a whole process in real time.

This invention discloses a perovskite-activated carbon composite material for the catalytic conversion and capture of toxic gases from spontaneous coal combustion, its preparation method, and its applications. This composite material optimizes the structure and properties of the perovskite by doping with transition metal elements and combines it with activated carbon, which has a high specific surface area, to form an integrated catalytic and capture system. The perovskite material promotes the catalytic oxidation of toxic gases such as CO and SO2 generated from spontaneous coal combustion through catalysis, while the activated carbon, with its high specific surface area and abundant microporous structure, effectively adsorbs catalytic products in coalfield fire zones. The raw materials used in this invention are energy-saving, environmentally friendly, and inexpensive. The resulting composite material significantly improves the catalytic conversion efficiency for treating various toxic gases and solves problems such as low catalytic efficiency, poor capture capacity, and insufficient thermal stability in existing technologies. This composite material exhibits excellent performance in the treatment of toxic gases in high-temperature and complex environments such as coalfield fire zones and has broad application prospects.

This invention provides a PA / CS / TA inhibitor for suppressing coal spontaneous combustion and its preparation method, belonging to the field of inhibitor technology. This invention employs aqueous phase electrostatic self-assembly technology to prepare the PA / CS / TA inhibitor. The PA / CS / TA inhibitor can eliminate free radicals and reduce the activity of the coal-oxygen reaction system from the essence of the coal oxidation reaction, thus preventing the occurrence of a chain reaction of coal oxidation spontaneous combustion to a certain extent. From the perspective of chain reaction propagation, the inhibitor can effectively capture the key group -OH, reducing the rate of the coal-oxygen reaction and slowing down its progress. PA, CS, and TA act as acid source, carbon source, and gas source, respectively, and play a mutually promoting role during thermal decomposition. CS and TA, under the promoting effect of the acid source PA, form an encapsulating carbon layer on the coal surface, while simultaneously releasing inert gases. This causes the carbon layer to expand and dilutes the oxygen concentration around the coal, resulting in a significant inhibitory effect on coal oxidation spontaneous combustion.

This invention discloses a system for preparing foamed fluid containing solid particles and a method for controlling the material addition ratio. The system includes: a slurry supply unit for metering and mixing solid raw materials and liquids to form and output a slurry containing solid particles with adjustable flow rate; a foaming liquid supply unit for storing and outputting a foaming liquid with adjustable flow rate; a gas supply unit for providing gas with adjustable pressure and flow rate; a mixing output unit for receiving and mixing the slurry from the slurry supply unit, the foaming liquid from the foaming liquid supply unit, and the gas from the gas supply unit to form and output a foamed fluid containing solid particles; and a control unit for receiving the flow rate or weight signals of each material and controlling the output of each supply unit according to preset material ratio parameters to achieve proportional preparation of the foamed fluid. This system can prepare foamed fluid materials containing solid particles with different material addition ratios, achieving efficient prevention and control of coal spontaneous combustion disasters in mines.

The application discloses a coal spontaneous combustion temperature prediction method based on ALA-TCN-TimeXer, and belongs to the technical field of coal mine fire prediction. An integrated prediction framework is constructed by fusing an artificial traveling wave optimization algorithm ALA, a time convolution network TCN and a TimeXer model. The method first preprocesses coal spontaneous combustion gas concentration and temperature data and constructs samples; then, key hyperparameters such as a self-adaptive optimization learning rate and model dimension of the ALA are learned; local time series and multi-scale dynamic features are extracted by using the TCN; global dependence and coupling relationship modeling of a temperature target sequence and gas exogenous variables is realized by using the TimeXer; and finally, the predicted temperature is output through a full connection layer. The application can effectively capture temperature mutation and long-term trend, improve prediction accuracy and stability, and provide reliable technical support for early warning of coal spontaneous combustion and mine safety monitoring.

The clay-based, highly stable gel foam for inhibiting coal spontaneous combustion of the present invention comprises, by mass percentage: 0.3% compound foaming agent, 3.4% synergistic foam stabilizing gelling agent, 1.7% crosslinking agent, 0.4% pH adjuster, and the balance being deionized water; the synergistic foam stabilizing gelling agent is composed of sodium bentonite (Na-Bt) and sodium alginate (SA) in a mass ratio of 3:0.4. The gel foam prepared by this invention exhibits excellent temperature resistance, water retention, coverage, and fire resistance. It can significantly inhibit coal spontaneous combustion through the combined effect of "synergistic foam stabilization - three-dimensional gelation - heat insulation and water locking." The preparation process is simple and suitable for fire prevention and extinguishing projects in complex environments such as coal mine goaf areas.

The application discloses a coal spontaneous combustion timing early warning method based on a goaf multi-modal signal, and particularly relates to the following steps: establishing a coal mine goaf multi-modal signal monitoring system; collecting the concentration of gas in the coal mine goaf; collecting the temperature of the temperature measurement multi-mode optical fiber in the coal mine goaf; dividing the coal spontaneous combustion three zones in real time based on multi-index gas concentration; judging whether there is a coal spontaneous combustion hidden danger in the goaf at present, analyzing whether there is a coal spontaneous combustion hidden danger in the goaf by setting a threshold and a coal spontaneous combustion hidden danger discrimination model; reading the distributed optical fiber temperature measurement temperature value, calculating the next moment residual coal temperature through a goaf coal spontaneous combustion temperature early warning model; and judging whether there is a coal spontaneous combustion hidden danger in the goaf at the next moment. Through the construction of a multi-modal signal fusion dynamic monitoring system, the accuracy of the goaf coal spontaneous combustion risk identification is significantly improved. Meanwhile, through the optimized timing prediction model and multi-stage early warning mechanism, the advanced prevention and control of the coal spontaneous combustion risk is realized.

This invention discloses a wireless real-time data acquisition system for coal magnetic intensity and marker gas concentration, belonging to the field of coal spontaneous combustion experiment technology. The method includes: mixing dry air with a mixed gas and then introducing it into a vertical tubular furnace; placing a coal sample in the furnace for programmed temperature rise; arranging temperature and magnetic intensity sensors within the furnace and connecting them to a microcontroller unit to collect temperature and magnetic intensity data; after programmed temperature rise and oxidation, the gas enters a flow meter and then flows through a gas concentration sensor; the gas concentration sensor is connected to the microcontroller unit to collect the marker gas concentration; the microcontroller unit communicates with a WiFi module via RS485 or a serial port, and the WiFi module transmits the collected data to a mobile application using the MQTT / TCP communication protocol. This invention solves the problem of wireless real-time acquisition of coal magnetic intensity and marker gas concentration during programmed temperature rise experiments.

The application provides a composite inhibitor for preventing and treating coal spontaneous combustion based on antioxidant regeneration, and belongs to the technical field of coal spontaneous combustion inhibition, and the composite inhibitor comprises a main antioxidant and a regenerator. The main antioxidant can capture coal oxygen free radicals, and the regenerator can reduce and regenerate the oxidized main antioxidant. Compared with the prior art, the application first introduces the "antioxidant regeneration" into the field of coal spontaneous combustion prevention and treatment. The mode that the traditional inhibitor loses activity after playing a role is overturned, the long-term efficiency of the chemical inhibitor is ensured, and thus the excellent inhibition effect of the chemical inhibitor is prolonged.

This invention discloses a pre-set, phased prevention and control method for spontaneous combustion of coal in the goaf during the drainage process of overlying water-filled goaf areas. It includes a comprehensive drainage process for preventing spontaneous combustion of coal in the goaf and a multi-path inert medium co-transport technology system. Relying on three inert medium transport modes—directional transport through borehole channels, guided diffusion through fracture insertion holes, and continuous replenishment through water-filled holes—the entire process of prevention and control is completed sequentially. Before operation, inert gas boreholes are deployed at the end of the drainage boreholes to replace oxygen in the area. The nitrogen injection volume per hole is calculated by coupling the number of boreholes, elevation difference, spatial distance, and a circular control unit to estimate the water accumulation. Outward-expanding support-type directional gas injection components are deployed in the fractures. During operation, the components continuously supply nitrogen, and the negative pressure generated by the drainage draws in surrounding nitrogen into the prevention and control area. After operation, the drainage boreholes are converted into inert medium replenishment channels. Through the coordinated action of a dual-tank injection system for film formation and a pneumatic multi-stage atomization device, the support borehole walls are first stabilized, and then the inert medium is continuously replenished.

The present application relates to the technical field of coal-fired power plant steel trestle fire prevention and control, and in particular to a fire monitoring and prevention equipment for a coal-fired power plant steel trestle, comprising a conveying frame, a suspension assembly, an adjusting assembly and a temperature measuring assembly. The conveying frame is annular, and the suspension assembly is used to move and cooperate multiple temperature measuring assemblies on the conveying frame. The multiple temperature measuring assemblies can be independently adjusted in position under the driving of the multiple suspension assemblies, so that the equipment can adjust the position of the temperature measuring assembly according to the distribution of the coal pile on the coal-fired power plant steel trestle. More temperature measuring assemblies are arranged in the area where more coal is distributed and where coal spontaneous combustion is more likely to occur on the coal-fired power plant steel trestle, so that the monitoring of the equipment on the fire can be flexibly adjusted according to the situation of the coal transported on the coal-fired power plant steel trestle.