24 results about "Coal fire" patented technology

The invention discloses a coal fire area fracture active enhancement detection test system and method, and belongs to the technical field of mine safety and geophysical exploration, and the system comprises a fracture generation module which is used for simulating a heat-force-gas coupling condition of an underground coal fire area, and inducing a coal rock mass test piece to generate a fracture; the fracture detection module is used for synchronously acquiring multi-physics field data of the coal and rock mass test piece in real time; the fracture intervention module is used for injecting a natural medium simulant and an enhanced medium foam gel material into the fracture so as to simulate a real environment and enhance a detection signal; and the intelligent feedback and data fusion module is used for controlling operation parameters of each module, synchronously acquiring detection data, and performing fusion processing, intelligent inversion and four-dimensional visualization on the detection data to realize whole-process monitoring detection of fracture evolution. The invention provides a scientific method for precise delineation and targeted plugging treatment of hidden fractures in a coal fire area, and solves the problems of multiplicity of solution in traditional fracture detection and easy reburning in coal fire treatment.

The invention discloses a coal fire area magnetic foam colloid injection magnetic method detection system and method, and belongs to the technical field of coal fire treatment and geophysical exploration, and the system comprises a magnetic foam colloid preparation module, an injection module, a magnetic field generation and detection module, a data processing module and a fracture distribution analysis module; the magnetic foam colloid preparation module is used for preparing a magnetic foam colloid with a high-temperature-resistant characteristic; the injection module is connected with the magnetic foam colloid preparation module and the magnetic field generation and detection module, and is used for injecting the magnetic foam colloid into a coal fire area crack; the magnetic field generation and detection module generates a magnetic field and detects the magnetic field change caused by the magnetic foam colloid; the data processing module processes and analyzes the detected magnetic field signal; and the fracture distribution analysis module generates a visual image of fracture distribution according to the processed data. According to the invention, high-precision, high-reliability and high-field-adaptability detection of the crack space of the coal fire area can be realized, the coal fire leaking stoppage treatment efficiency can be obviously improved, and the resource consumption can be reduced.

The invention discloses a quality-divided separation and high-valued utilization method of coal gasification slag, a generated product and application, and belongs to the technical field of high-valued recycling of coal gasification slag. According to the method, the coal gasification slag is classified by adopting an alkali fusion-acid leaching two-step method, components in the coal gasification slag are classified into pure carbon components and a metal-containing acid leaching salt solution, a high-valued utilization method is provided for the classified components, and the carbon components are activated into an active carbon electrode material with a high specific surface area and applied to the field of energy storage. The metal-containing acid leaching salt solution is prepared into the metal cross-linked hydrogel, and the metal cross-linked hydrogel is applied to the field of coal flame retardance. The method can effectively solve the technical problem that the overall utilization is restricted by carbon ash caused by multi-metal component mixing and high carbon content of the coal gasification slag in the prior art.

The application discloses a coal fire area multi-source remote sensing identification method and system based on three-layer integrated learning, which comprises the following steps: based on multi-modal remote sensing data, the multi-element information of the fire area is extracted, the multi-modal remote sensing data comprises thermal infrared images, multispectral images, SAR images and night light images; based on the multi-element information of the fire area, the characteristic samples of the fire area are demarcated; the integrated learning model is constructed based on the characteristic samples of the fire area, and the range of the fire area is identified based on the integrated learning model. Compared with the traditional fire area identification method, the application only studies a single small range fire area, the corresponding parameters are repeatedly re-adjusted with the change of the study area, and the limitation caused by the decrease of the sensitivity of some parameters cannot be estimated. The application directly takes higher confidence for the sample, guarantees the high reliability of the sample, and can be applied to large-scale fire area monitoring through the collaborative learning of various parameters, and has strong generalization ability.

The invention discloses a coal fire sCO2 power generation system based on modular integration, and belongs to the technical field of coal fire heat energy utilization, and the coal fire sCO2 power generation system comprises a power generation module which comprises an sCO2 Brayton cycle unit and is used for converting coal fire heat energy into electric energy; the underground heat exchange well group module comprises a plurality of heat exchange wells inserted into a coal fire area and is used for transferring coal fire heat energy to the sCO2 working medium, and the arrangement positions and depths of the heat exchange wells are differentially set according to the temperature distribution characteristics of the coal fire area; and the self-adaptive regulation and control module comprises a controller, and the controller is configured to monitor the temperature distribution characteristics of the coal fire area in real time and dynamically adjust the thermal load distribution of the underground heat exchange well group module and the operation parameters of the power generation module based on the dynamic change of the temperature distribution characteristics so as to maintain the stability of the power generation efficiency. The method effectively overcomes the defect that a traditional power generation technology is insufficient in adaptability in a coal fire scene, and the overall power generation efficiency and operation stability of the system are remarkably improved.

The utility model relates to the technical field of coal mine fire prevention, specifically relates to a kind of open pit coal fire prevention sprinkler, including water pipe, sprinkler pipe and water pipe, the water pipe is used to pre-bury in the below of coal stacking area, and the water inlet end of the water pipe is connected with water source by water pump, the inside of the sprinkler pipe is equipped with limiting cavity, the water pipe includes sleeve, expansion section, diffusion part and limiting part, the sleeve sleeve is connected in the outer periphery of the sprinkler pipe;When natural or other reasons cause mine coal to ignite, it can be accurately and quickly in coal stacking area to carry out the sprinkling of fire-extinguishing water, beneficial to reduce property loss;Under the connecting effect of extension, sleeve and diffusion part can automatically adapt to the impact of water flow and vibrate up and down, disperse fire-extinguishing water and directly move towards mine coal direction, while limiting part effectively avoids water pipe vibration to separate from sprinkler pipe, ensures that open pit coal fire prevention sprinkler successfully completes fire extinguishing operation, ensures life and property safety.

The invention discloses an injection and detection separated coal fire crack recognition plugging method and plugging system, and relates to the field of coal field drilling and coal field fire area governance. The plugging method comprises the steps that a drilling network is formed for coal fire area construction, observation holes are selected for combined electro-magnetic scanning, and data vectors before and after tracing medium injection are obtained; reconstructing the three-dimensional conductivity and magnetic conductivity distribution of the underground crack, obtaining the three-dimensional space distribution of the crack, and determining the grouting amount of the tracing plugging material; according to the system, heat dissipation drilling, crack recognition, plugging and depth control are integrated, and the whole process of high-temperature hole forming, tracing injection, electromagnetic scanning, inversion imaging, targeted grouting and effect verification is completed. According to the method, conductivity and magnetic conductivity two-parameter joint inversion is realized, the problems that natural geological anomalies and crack channels cannot be distinguished through single electrical method / magnetic method detection, the number of inversion result false anomalies is large and the like are solved, true three-dimensional and high-resolution stereo imaging of crack space distribution and connectivity is realized, and a high-precision target spot is provided for targeted grouting.

The application discloses a coal fire area fissure active enhancement exploration test system and method, and belongs to the technical field of mine safety and geophysical exploration, and comprises: a fissure evolution module, which is used for simulating the thermal-power-gas coupling condition of an underground coal fire area, and inducing the coal rock mass test piece to generate fissures; a fissure exploration module, which is used for collecting the multi-physical field data of the coal rock mass test piece in real time and synchronously; a fissure intervention module, which is used for injecting natural medium simulation objects and enhanced medium foam gel materials into the fissures, so as to simulate a real environment and enhance the detection signal; an intelligent feedback and data fusion module, which is used for controlling the operation parameters of each module, synchronously acquiring the detection data, and performing fusion processing, intelligent inversion and four-dimensional visualization on the detection data, and realizing the whole process monitoring and detection of the fissure evolution. The application provides a scientific method for accurately delineating and target plugging and treating the hidden fissures in the coal fire area, and solves the problems of the multi-solution of traditional fissure exploration and the easy re-ignition of the coal fire treatment.

The invention relates to the technical field of coal mining and mine safety, and discloses a digital twinborn simulation method for a coal fire spontaneous combustion process, which comprises the following steps: constructing a multi-physical field coupling model for the coal fire spontaneous combustion process, the model comprising physical processes of heat conduction, chemical reaction and fluid flow; optimizing the multi-physics field coupling model by using a machine learning algorithm, and training model parameters by collecting coal fire spontaneous combustion data; temperature and gas concentration data in the coal fire spontaneous combustion process are collected in real time, and the data are fed back to the multi-physics field coupling model for dynamic updating. The complex physical and chemical phenomena in the coal fire spontaneous combustion process can be comprehensively and accurately simulated by constructing a multi-physical field coupling model and combining multidisciplinary models such as a geological structure, a ventilation system and a chemical reaction. The model is further optimized by using a machine learning algorithm, and dynamic updating is carried out by combining multi-parameter data such as temperature, gas concentration and pressure which are collected in real time.

The utility model discloses a series connection system of an air cooling unit suitable for large-temperature-difference heat supply, and belongs to the technical field of energy conservation and consumption reduction of coal-fired units. A heat source of a primary heat supply network heater of the system is communicated with exhaust steam of a low-pressure cylinder, a heat source of a peak heater is communicated with exhaust steam of an intermediate-pressure cylinder, and an absorption heat pump is communicated with a heating station. According to the system, an absorption type heat pump is introduced to a heat supply network water circulation pipeline, low-temperature heat of heat supply network return water is fully utilized through the absorption type heat pump, heat supply network water with heat loss caused by long-distance transmission is heated through the low-temperature heat, heat of dead steam can be fully utilized, and the heat supply network return water temperature is changed from traditional 130 / 70 DEG C to 130 / 30 DEG C; the temperature difference of supply water and return water of the heat supply network is increased, more power plant waste heat is recycled through the first-stage heat supply network heater and the peak heater, a large-temperature-difference long-distance heat plant waste heat conveying central heating mode is formed, and the conveying capacity of the heat supply network is greatly improved.

The invention discloses a deep goaf coal spontaneous combustion air leakage fracture plugging material failure judgment and optimization method, which comprises the following steps: firstly, obtaining physical and mechanical parameters of different types of plugging materials, and establishing failure judgment conditions of the plugging materials in air leakage fractures by introducing strength factors; the failure judgment conditions are used for judging the plugging states of different types of plugging materials under the conditions of different coal seam strike angles and fracture angles, and accurate and targeted fracture plugging is achieved; meanwhile, the non-failure angle range of goaf coal spontaneous combustion air leakage crack plugging by different types of plugging materials under the current working face condition can be determined; according to the method, in combination with the field fracture angle concentration range, the plugging material with the largest coincidence range is selected as the optimal plugging material for plugging the current field fracture subsequently, the risk that the plugging material loses efficacy in the fracture is reduced, time, manpower and material resources consumed in the coal fire prevention and extinguishing process are saved, and the coal fire prevention and extinguishing efficiency is improved. And the fire prevention and extinguishing level of a coal mine is effectively improved.

The utility model discloses a coal fired unit quick peak load regulation and frequency modulation system of high temperature working medium heat storage of heat recovery system coupling relates to conventional heating power electric technology and energy storage technical field, including coal fired unit thermodynamic cycle system and high temperature working medium heat storage system, wherein, high temperature working medium heat storage system and coal fired unit thermodynamic cycle heat recovery system carry out the deep coupling, through the mutual cooperation of reducing steam turbine each stage extraction steam amount and high temperature working medium heat storage system energy supply, realizes the quick combined peak load regulation and frequency modulation of unit. First, when the unit needs quick load, through reducing steam turbine each stage extraction steam amount, realizes the quick promotion of unit power output, at the same time, the high temperature, high pressure saturated water stored in high temperature working medium heat storage tank produces a certain amount of saturated steam through pressure reduction to replace the boiler feed water in steam turbine each stage extraction heating heat recovery system, thereby guaranteeing that the boiler feed water temperature still keeps unchangeable or has the improvement, and then realizes the quick promotion of coal fired unit variable load response ability.

The invention discloses a nozzle for pulverized coal activation and a pulverized coal activation device, and belongs to the technical field of low-load stable combustion of boilers. The problems that an existing stable combustion technology is complex in structure and high in operation cost are solved. The nozzle for activating the pulverized coal comprises a combustion-supporting air pipe, a primary air pipe and a secondary air pipe which are sequentially arranged from inside to outside, a burning torch, an oil gun and an oil flame detection device are inserted into the combustion-supporting air pipe, a combustion-supporting air channel is formed in the combustion-supporting air pipe, a primary air channel is formed between the combustion-supporting air pipe and the primary air pipe, and primary air carries the pulverized coal to enter the primary air channel; a secondary air channel is formed between the primary air pipe and the secondary air pipe, a coal fire detection device and a water spraying pipe are inserted into the final assembly flange, and an atomizing nozzle is arranged at the water outlet end of the water spraying pipe. The method is used for activating the pulverized coal.

This invention relates to the field of mine ecological restoration technology, and discloses a method and system for mine ecological restoration. The restoration method includes selecting an area with residual heat from underground coal fires on a mine slope where residual coal has spontaneously combusted as a restoration zone; reinforcing and stabilizing the slope of the restoration zone; laying a sludge substrate with a moisture content of 60%-80% on the stabilized slope surface, and using the residual heat from the underground coal fires for in-situ biological drying until the volume reduction reaches a preset threshold of 40%-60%; subsequently, covering the dried sludge substrate with a soil substrate layer and a soil microbial substrate layer to construct a composite growth matrix; and finally, maintaining vegetation on the slope. This invention cleverly combines the residual heat from abandoned mines with urban sludge treatment, achieving the harmlessness, reduction, and resource utilization of sludge, while simultaneously solving the problems of excessively high soil temperatures and difficulty in plant survival in mining areas, achieving the goal of ecological restoration through waste treatment and synergistic efficiency.

The invention provides a coal seam hidden fire area detection method and system based on a ferroelectric material, and relates to the technical field of underground coal fire prevention and control. A ferroelectric material finished product is pre-buried in a goaf and a ground penetrating radar is used for real-time detection, and the method can accurately capture the dielectric constant change caused by the coal seam temperature change, so that the coal seam hidden fire area detection accuracy is improved. Based on the design of the cross temperature and the reference dielectric constant, the ferroelectric material can sensitively reflect the electromagnetic characteristic change caused by the temperature change, the detection data of the ground penetrating radar is combined to form a clear electromagnetic characteristic diagram, the problem of blind areas of the traditional temperature and gas detection technology is solved, and the detection accuracy is improved. More comprehensive and seamless monitoring coverage is provided, the occurrence of spontaneous combustion is judged in time by effectively analyzing an electromagnetic characteristic diagram of a monitoring point, a coal fire area is arranged and divided, and the safety management level of a coal mine is effectively improved.

This invention provides a method and system for detecting hidden coal seam fires based on ferroelectric materials, relating to the field of underground coal fire prevention technology. By pre-burying finished ferroelectric materials in the goaf and using ground-penetrating radar for real-time detection, this method can accurately capture changes in the dielectric constant caused by coal seam temperature variations, thereby identifying potential spontaneous combustion risks earlier. Based on the design of cross-temperature and reference dielectric constant, the ferroelectric material can sensitively reflect changes in electromagnetic properties caused by temperature changes. Combined with ground-penetrating radar detection data, a clear electromagnetic characteristic map is formed. This invention solves the blind spot problem of traditional temperature and gas detection technologies, providing more comprehensive and seamless monitoring coverage. By effectively analyzing the electromagnetic characteristic map of monitoring points, the occurrence of spontaneous combustion can be determined in a timely manner, allowing for the layout and delineation of coal fire areas, effectively improving the level of coal mine safety management.

The invention relates to the technical field of mine ecological restoration, and discloses a mine ecological restoration method and system. The restoration method comprises the following steps: selecting an area with underground coal fire waste heat on a mine slope with residual coal spontaneous combustion as a restoration area; engineering reinforcement and slope surface fixation are conducted on the slope of the restoration area; a sludge base material with the water content being 60%-80% is laid on the fixed slope surface, and in-situ biological drying is conducted through underground coal fire waste heat till the volume reduction reaches a preset threshold value of 40%-60%; then, sequentially covering the dried sludge base material with a soil base material layer and a soil bacterium base material layer to construct a composite growth substrate; and finally carrying out vegetation maintenance on the slope surface. According to the method, the waste heat of the abandoned mine and municipal sludge treatment are ingeniously combined, harmlessness, reduction and recycling of the sludge are achieved, meanwhile, the problems that the soil temperature of a mining area is too high, and plants are difficult to survive are solved, and the ecological restoration purposes of treating waste with waste and achieving synergistic interaction are achieved.

The present disclosure provides pumped heat energy storage systems that can be integrated with a Coal Fired Energy Generation Unit (CF-EGU) to repurpose CF-EGUs as thermal energy storage systems. A pumped heat energy storage system of the present disclosure can store thermal energy by operating as a heat pump with heat discharge occurring as a result of heat engine operation of the pumped heat energy storage system and / or a steam cycle of the CF-EGUs to provide heating thereto. For example, thermal energy can be exchanged via working fluids flowing between the pumped heat energy storage systems and the CF-EGUs to drive turbines that provide power to generators while repurposing equipment from the CF-EGUs to create energy.

This invention provides a method for creating a flammability map for indoor fire flashback phenomena, characterized by the following steps: S1. Sampling flue gas to obtain raw data: oxygen volume fraction, carbon dioxide volume fraction, carbon monoxide volume fraction, total hydrocarbon volume fraction (represented by methane concentration), and hydrogen gas integral (for underground coal fires). The excess nitrogen gas integral is obtained by subtracting the sum of the above gases from 100% (i.e., the remaining nitrogen portion after air removal in the full gas analysis); S2. Generating de-air-removed derived data based on the raw data: total nuclear flue gas volume, total nuclear flue gas volume, and normalized data; constructing the flammability zone of the core flue gas (pseudo-fuel) using thermal fingerprint parameters formed by weighted averaging; S3. Based on the proportion of the core flue gas, the position of the state point can be plotted, which, together with the core flammable zone, forms a gas flammability map (flame map); S4. Calculating the comprehensive index of the flue gas: combustion flow, directly determining the combustion and explosion potential of the flue gas. The combustion chart (flame diagram) displays the combustion and explosion potential of the flue gas mixture and can be used to diagnose the ignition potential (nose point) and explosion potential (state point) of the flue gas; the flow chart (flow diagram) directly generates the combustion and explosion potential of the flue gas. Therefore, both can be used to predict and display the flashback phenomenon in a fire, which has important risk indication value for firefighters' fire safety and is a brand-new means of fire safety diagnosis.

The invention discloses a system and method suitable for variable-load operation of a high-alkali coal fired boiler. Aiming at the problem of serious ash deposition and slag bonding during high-load operation of the high-alkali coal boiler for combustion, a low-temperature flue gas recirculation method is used for solving the problem of overhigh NOx emission during low-load operation of the boiler for combustion, and the boiler for combustion is flexibly modified through technologies such as high-temperature flue gas recirculation, membrane-method oxygen-enriched air separation and staged combustion; therefore, the purpose of safe operation under the variable load condition is achieved. According to the method, the problem of serious ash deposition and slag bonding during high-load operation of the high-alkali coal fired boiler can be effectively relieved, and the boiler transformation cost is reduced in a flue gas recirculation mode; the ultra-low NOx emission during low-load operation of the high-alkali coal fired boiler can be realized, and the cost of a traditional integral oxygenation device is greatly reduced through a local oxygenation device, namely a membrane-method oxygen-enriched separation system; meanwhile, flue gas waste heat is recycled, and the comprehensive utilization rate of energy is increased.

The invention discloses a three-dimensional hydrogen-doped staged combustion system of a pulverized coal fired boiler, and belongs to the technical field of coal fired boiler combustion. The system comprises rich-lean separation type direct-current combustors arranged at the four corners of a hearth, a hydrogen combustion-supporting system, a low-nitrogen carbon-reduction hydrogen main combustor and an intelligent combustion control system. A double-layer stable combustion hydrogen nozzle clamps a pulverized coal nozzle to form transverse classification, a main combustor is matched with over fire air to form longitudinal classification, and a three-dimensional hydrogen-doped staged combustion structure is constructed. The system stabilizes combustion and prevents slag by increasing hydrogen flow during low load, and starts a hydrogen-replaced-coal mode to adjust heat distribution and reduce carbon emission during deep low load. The intelligent control system optimizes operation parameters in real time, and efficient and clean combustion in the whole process is achieved. According to the method, the collaborative optimization problem of low-load stable combustion, NOx emission reduction, slagging prevention and carbon emission reduction is effectively solved, and the environmental protection performance and the operation flexibility of the coal-fired boiler are remarkably improved.

The application discloses a coal fire abnormal temperature intelligent identification method based on multi-source time sequence thermal infrared satellite images, selects multi-source thermal infrared and visible light data of various satellites in recent period, reduces the influence of cloud layer on telemetry results, adopts a specific correction model in combination with digital elevation data to perform terrain correction on the thermal infrared data of the satellite, weakens the influence of the terrain effect in the thermal infrared satellite image on temperature values in the identification of the coalfield fire area, then trains a YOLOv5 model to detect the coalfield area and the non-coalfield area, simultaneously fuses visible light and thermal infrared satellite image data, weakens the influence of human activities on the identification of the coalfield fire area in the thermal infrared satellite image, finally extracts time sequence change characteristics of the temperature data of the satellite image for at least one year, and finally effectively improves the identification efficiency and accuracy of the thermal anomaly of the thermal infrared satellite image through a U-Net-CBAM model with a fusion attention mechanism, so that precise identification and positioning of the abnormal temperature area of the coalfield in a complex terrain are realized.

The invention discloses a well-ground combined rock burst-goaf residual coal ignition composite disaster treatment method. The method comprises the steps that 1, the three-dimensional space position of an underground directional long drilling track of a coal mine is determined; step 2, implementing coal mine underground directional long drilling and ground directional well penetration based on the position of the coal mine underground directional long drilling; step 3, well-ground combined fracturing pipeline connection and pressure-bearing test; 4, performing sand blasting perforation staged fracturing by adopting a front-end single-seal retreating dragging perforation fracturing tool string; 5, a rear-end single-seal retreating type dragging perforation fracturing tool string is adopted for implementing casing pipe local encryption perforation of the whole hole section of directional drilling; and 6, a grouting pipeline is tripped into the casing pipe after the local dense perforation through a coal mine underground drilling machine, and loess slurry is injected to prevent spontaneous combustion of residual coal in the goaf. According to the method, the goal of cooperative treatment of rock burst and goaf residual coal ignition disasters can be efficiently achieved through the drill hole along the coal seam roof.

This application discloses a longwall top coal caving mining system, a residual coal fire prevention and extinguishing system, and a method. The residual coal fire prevention and extinguishing system includes: a slurry supply system; a spraying system comprising multiple spraying units, each including a nozzle and a slurry control valve, each spraying unit corresponding to at least one hydraulic support, the hydraulic support being equipped with a first pressure detection device for detecting the oil pressure in the return oil pipeline of the rear scraper conveyor of the hydraulic support; and a control device electrically connected to the slurry supply system, the slurry control valve, and the first pressure detection device, to control the operation of the slurry supply system and the opening and closing of the multiple slurry control valves based on the pressure signal detected by the first pressure detection device, and to control the slurry control valves to close after the opening time reaches a preset duration when the slurry control valves are opened. The residual coal fire prevention and extinguishing system of this application provides sufficient slurry spraying and achieves good fire prevention and extinguishing effects.