63 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 power station pulverized coal boiler dry deslagging furnace bottom air leakage treatment system and method, relates to the technical field of power station boiler dry deslagging, and mainly aims to reduce inorganized cold air entering a hearth, reduce adverse effects on the hearth temperature, enable the combustion process to be more stable and improve the combustion efficiency. According to the main technical scheme, the dry slag removal furnace bottom air leakage treatment system for the pulverized coal fired boiler of the power station comprises a dry bottom hopper, a slag removal box body and an air suction and exhaust device, a dry slag conveying belt is arranged in the slag removal box body, and a slag falling opening is formed in the position, opposite to the dry bottom hopper, of the slag removal box body; exhaust ports are formed in the two sides, in the length direction of the dry slag conveying belt, of the slag falling port respectively, the exhaust ports are communicated with the air suction and exhaust device through a communication air duct, a switching valve is arranged on the communication air duct, and the opening degree of the switching valve is adjustable.

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 mine underground precise fire preventing and extinguishing cooperation system based on rock mass fracture recognition, the mine underground precise fire preventing and extinguishing cooperation system comprises a data acquisition module, a rock mass fracture recognition module and a risk assessment module, and the invention further discloses a mine underground precise fire preventing and extinguishing cooperation method based on rock mass fracture recognition. The whole process from image input to fracture feature extraction, fracture positioning and risk assessment is achieved, the relation between the fire risk and fracture performance features can be effectively analyzed, the recognition accuracy of coal rock fractures and the reliability of risk assessment are improved, an effective fire prevention and extinguishing scheme is designed in combination with expert experience, in addition, a decision-making tree model is established, and the risk assessment efficiency is improved. Fire risk scoring is carried out according to image crack characteristics, an underground coal fire comprehensive prevention and control theory and technical system is finally constructed, and accurate targeted treatment of underground coal fire can be realized.

A panoramic scanning coal fire detection and disaster early-warning, prevention and control apparatus for a mining area, the apparatus comprising a detection apparatus, a laser scanning apparatus, a satellite remote-sensing monitoring apparatus, a data processing and analysis system, and an early-warning, prevention and control apparatus. High-precision thermistor temperature sensors (1) are arranged inside, on the surface and in surrounding areas of coal piles, such that subtle changes in the temperature of the coal piles can be accurately captured, and early-stage potential coal fire hazards can be effectively detected; gas sensors (2) installed at vents of a mining area can simultaneously measure the concentrations of gases such as carbon monoxide, carbon dioxide, methane and sulfur dioxide, so as to promptly identify anomalies in gas composition that are caused by coal fire combustion; an infrared thermal imager (3), which is located at a high position to acquire a panoramic view of the mining area, can clearly display high-temperature regions; and cameras (4) provide high-definition, wide-angle and low-illumination visual monitoring, and various sensors comprehensively collect data from different dimensions, thereby greatly improving the accuracy and comprehensiveness of monitoring.

The invention provides a method for determining the spontaneous combustion evolution process of end slope coal of a strip mine, and belongs to the field of geotechnical engineering geological disaster prevention and control and the field of mine safety and environmental protection. Updating the porosity, the permeability and the range of the combustion space area in the pre-established three-dimensional geologic model by adopting the three-dimensional distribution of the porosity of the bending subsidence zone, the permeability of the fissure zone, the permeability of the caving zone and the porosity of the caving zone in the combustion space area; performing coal fire evolution simulation again according to the updated pre-established three-dimensional geologic model to obtain a coal fire development range, an updated real-time temperature field range and a gas concentration field; and if the combustion cannot be continued, outputting a final coal fire development range and an updated real-time temperature field range. According to the method, the efficiency and accuracy of open-pit mine end slope coal fire treatment are effectively improved.

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 invention discloses a system and a method for measuring and calculating the emission amount of atmospheric pollutants of underground coal fire, and relates to a system for measuring and calculating the emission amount of atmospheric pollutants of underground coal fire. Comprising a power supply module, a methane emission monitoring module, a carbon oxide monitoring module, a nitrogen oxide monitoring module, a sulfur dioxide monitoring module, a black carbon emission monitoring module and an atmospheric pollutant emission flux calculation module. The environmental factor acquisition module, the methane emission monitoring module, the oxycarbide monitoring module, the nitrogen oxide monitoring module, the sulfur dioxide monitoring module, the black carbon emission monitoring module and the atmospheric pollutant emission flux calculation module are all connected with the power supply module; the measuring and calculating method of the underground coal fire atmospheric pollutant emission amount measuring and calculating system comprises the following steps: S1, placing the instrument at a proper position, and adjusting a proper sampling frequency; the problem that the atmospheric pollutant emission flux is difficult to measure and calculate due to intermittency and dispersity of underground coal fire combustion is solved.

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.

The invention discloses a deep learning coal fire detection method based on a ground penetrating radar, and the method comprises the steps: collecting a radar signal, carrying out the underground detection of a coal mine region through employing the ground penetrating radar, and obtaining the radar signal data of a coal mine underground medium; preprocessing data, extracting feature information of a reflected signal, performing data enhancement on the data, expanding the sample size by adopting rotation, translation and scaling modes, and enhancing the generalization ability of the model; carrying out deep learning modeling, extracting local features of the radar signals through CNN, and extracting time sequence features of the radar signals through LSTM; coal fire detection analysis: identifying whether a coal fire trace exists or not; and outputting and verifying a result. According to the method, high-precision and intelligent identification of the coal fire hidden danger area can be realized.

The present invention discloses a closed-loop system for coal mine gas development and utilization and waste gas emission reduction and a method for using the system. The system includes a closed-loop gas development system, a gas power generation system and a waste gas reinjection system. The system utilizes high-temperature hot waste gas generated by coal fire and gas power generation to displace coal seam gas, which not only increases the output of coal seam gas, but also reduces the emission of greenhouse gases in coal mining areas. It plays an important role in building green mines and achieving national carbon neutrality. In addition, since the injection of high-temperature waste gas into coal seams will cause the coal body to expand and deform, the permeability is greatly reduced, and the injection amount of high-temperature waste gas is small, in order to overcome this problem, the present invention proposes to provide an external expansion space for the coal body through high-pressure water jet cavity creation, so as to prevent the permeability of the coal seam from being reduced due to expansion caused by high temperature and adsorption, which is conducive to increasing the injection amount of waste gas.

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 present invention discloses a method for simulating the three-dimensional morphological evolution of underground coal fire burnout areas, and belongs to the field of geotechnical engineering geological disaster prevention and control. Sentinel-1A image data is obtained, and the DS-InSAR technology is used to extract the cumulative surface deformation value and the ArcGIS software is used to extract the cumulative surface deformation contour line; according to the stratigraphic parameters, surface temperature, three-dimensional temperature field and cumulative surface deformation contour line data of the area recorded in the data, a three-dimensional morphological prediction model of the underground coal fire burnout area is constructed in a computer using numerical simulation and three-dimensional modeling technology, and the three-dimensional morphological evolution process of the underground coal fire burnout area is inverted, and the formation of the underground coal fire burnout area after the coal seam is burned is simulated, and the three-dimensional morphological inversion result of the underground coal fire burnout area is verified. The method realizes the description of the geometric structure of the underground coal fire burnout area, reveals the morphological changes of the underground coal fire burnout area and its relationship with factors such as surface deformation, and provides a new scientific basis for understanding the spatial characteristics and control factors of underground coal fires.

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.

The utility model relates to the field of pulverized coal boilers, in particular to an anti-slagging device of a pulverized coal boiler. The anti-slagging device for the pulverized coal fired boiler comprises a supporting frame, a moving rod and a connecting base, the supporting frame is installed at the bottom end of the pulverized coal fired boiler body, the bottom end of the pulverized coal fired boiler body is fixedly connected with a receding motor, the output end of the receding motor is fixedly connected with the top end of the supporting frame, and the moving rod is installed on one side of the supporting frame. According to the utility model, the high-speed nozzle is used for blowing high-energy gas to carry out primary airflow scouring, and a physical scrubbing mode is also combined; the brush plate is tightly attached to the inner wall of the boiler for brushing, so that stubborn slag and dust attached to the inner wall of the boiler can be more effectively removed, and particularly the parts which are difficult to remove only by gas scouring, such as soot which can be removed by a shovel in a firewood stove; by means of the physical and airflow dual cleaning mechanism, the cleaning effect is remarkably improved, and it is ensured that the inner wall of the boiler is thoroughly cleaned.

The invention discloses an underground coal fire radiation smoldering physical similar simulation experiment device, and belongs to the field of coal fire smoldering. A heat radiation mechanism of the device is arranged at the top of an experiment box body; the gas supply mechanism is communicated with the experiment box body and is used for proportioning different gas mixtures, conveying the gas mixtures to the experiment box body and adjusting the positive pressure and the negative pressure of the experiment box body; the gas concentration monitoring mechanism is communicated with the experiment box body and is used for monitoring the volume concentration of various gases in the experiment box body in real time; a coal sample is placed in the sample placing box and is placed at the top of the weight monitoring mechanism; the upper part of the weight monitoring mechanism and the sample placing box are placed in the inner cavity of the experiment box body and are positioned below the heat radiation mechanism; the temperature monitoring mechanism comprises a thermodetector and a temperature data acquisition instrument; and the heat radiation, gas supply, gas concentration monitoring, weight monitoring mechanism and the temperature data acquisition instrument are all electrically connected with the data processing control mechanism. The method can solve the problem that research on air ignition condition parameters and smoldering spreading rules of coal fire smoldering is less at present.

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 invention discloses a low-load stable combustion device of a pulverized coal fired boiler, which relates to the field of combustors and comprises nozzles arranged at four corners of the pulverized coal fired boiler, the air inlet ends of the nozzles are connected with pulverized coal pipe elbows, and the air outlet ends of the nozzles are communicated with the interior of the pulverized coal fired boiler. And primary air carrying pulverized coal in the pulverized coal pipe elbow enters from the air inlet end of the nozzle and is discharged into the pulverized coal boiler from the air outlet end of the nozzle. According to the low-load stable combustion device for the pulverized coal fired boiler, primary air is shunted through cooperation of the concentration cover and the light phase groove, pulverized coal entering the gathering pipe can be concentrated under the cooperation effect of the air groove and the gathering cover, the content of the pulverized coal in airflow exhausted from the gathering pipe is higher, the flow speed is higher, and meanwhile under the cooperation of the electric heating strip, the combustion efficiency is improved. According to the pulverized coal boiler, the ignition point of pulverized coal entering the pulverized coal boiler from the gathering pipe is effectively reduced, the ignition point is advanced, the pulverized coal can be better ignited, low-concentration pulverized coal flowing around can be ignited, and therefore better stable combustion can be conducted on the pulverized coal boiler.

The application discloses a mine underground precise fire prevention and extinguishing coordination system based on rock mass fracture identification, comprising a data acquisition module, a rock mass fracture identification module and a risk assessment module, and discloses a mine underground precise fire prevention and extinguishing coordination method based on rock mass fracture identification.The fire prevention and extinguishing coordination system and method designed by the application realize the whole process from image input to fracture feature extraction, fracture positioning and risk assessment, can effectively analyze the connection between fire risk and fracture performance characteristics, improve the identification accuracy of coal rock fractures and the reliability of risk assessment, and design an effective fire prevention and extinguishing scheme in combination with expert experience.In addition, a decision tree model is established, fire risk is scored according to image fracture characteristics, and finally, an underground coal fire comprehensive prevention and control theory and technology system is constructed, so that precise targeted treatment of underground coal fire can be realized.

The present invention relates to the technical field of thermal power plants, and discloses a method for controlling fuel saving during the startup of a supercritical boiler, the method comprising: putting all the oil guns of the C layer into the C layer of the boiler and putting all the large oil guns of the D layer of the boiler into the D layer and igniting them; putting auxiliary steam into the deaerator for heating to increase the water temperature in the deaerator; starting the C layer coal mill; after the coal fire detection intensity of the C layer burner is higher than a specific value, withdrawing the D layer oil gun; waiting for the C layer plasma burner to release normal plasma arc to open the exhaust electric valve and the exhaust check valve connected to the turbine intermediate pressure cylinder, and putting the steam in the intermediate pressure cylinder into the steam side of the No. 2 high pressure heater to increase the feed water temperature; after the C layer coal mill increases to more than a specific amount of coal, except for the oil guns of the burners with coal fire detection intensity lower than the specific value, withdrawing the oil guns of the burners with coal fire detection intensity higher than the specific value. The above technical scheme can be set to stabilize combustion, improve the efficiency of fuel combustion in the oil gun, achieve the effect of fuel saving, and save fuel saving costs.

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 coal fire abnormal temperature intelligent identification method based on a multi-source time sequence thermal infrared satellite image, and the method comprises the steps: carrying out the selection of recent multi-source thermal infrared and visible light data of a plurality of satellites, and reducing the influence of a cloud layer on a remote measurement result; a specific correction model is combined with digital elevation data to carry out topographic correction on the satellite thermal infrared data, and the influence of the topographic effect in the thermal infrared satellite image on a temperature value in coal field fire area identification is weakened; then training a YOLOv5 model to detect a coal field area and a non-coal field area; visible light and thermal infrared satellite image data are fused at the same time, the influence of human activities on coal field fire area thermal infrared satellite image recognition is weakened, finally, time sequence change characteristics of satellite image temperature data with the continuous time of at least one year are extracted, and a coal field fire area thermal infrared satellite image recognition method is obtained by fusing a U-Net-CBAM model of an attention mechanism. Finally, the identification efficiency and accuracy of thermal infrared satellite image thermal anomaly are effectively improved, and accurate identification and positioning of a coal field abnormal temperature region in a complex terrain global region are realized.

The invention provides a method and a device for determining a back pressure platform for preventing and treating a coal fire area of a strip mine, and relates to the technical field of prevention and treatment of the coal fire area of the strip mine. Firstly, according to a Coulomb soil pressure theory, geometric parameters of a two-dimensional section of a composite slope of a dumping site and physical and mechanical parameters of a discharged soil body, soil pressure of a soil-rock contact surface is calculated; then, in order to weaken the shearing effect of the composite side slope of the waste dump on the slope toe area, the soil heaping amount required by a back pressure platform arranged at the slope toe of the composite side slope of the waste dump when the extension size of the back pressure platform in the three-dimensional space is 1 meter is calculated; the slope angle of the platform is the slope angle of the side slope of the dump and is used as a geometrical shape condition of the slope toe back pressure platform, and geometrical parameters of the slope toe back pressure platform are calculated according to the soil heaping amount. The method is low in implementation cost, the shear effect of the side slope of the waste dump on the slope toe is weakened, displacement of the soil body and the rock stratum at the slope toe is restrained, crack development is reduced, air permeability is reduced, and coal seam combustion and spreading are effectively restrained.

The present application discloses a physical similarity simulation experimental device for underground coal fire radiation smoldering, which belongs to the field of coal fire smoldering. The device's heat radiation mechanism is set on the top of the experimental box; the gas supply mechanism is connected to the experimental box, used to mix different gas mixtures and deliver them to the experimental box, and can adjust the positive and negative pressure of the experimental box; the gas concentration monitoring mechanism is connected to the experimental box, used to monitor the volume concentration of various gases in the experimental box in real time; the coal sample is placed in the sample placement box, which is placed on the top of the weight monitoring mechanism; the upper part of the weight monitoring mechanism and the sample placement box are placed in the inner cavity of the experimental box and are located below the heat radiation mechanism; the temperature monitoring mechanism includes a thermometer and a temperature data acquisition instrument; the heat radiation, gas supply, gas concentration monitoring, weight monitoring mechanism and temperature data acquisition instrument are all electrically connected to the data processing and control mechanism. The present application can solve the problem that there is currently little research on the parameters of the conditions for the ignition of coal fire smoldering in the air and the laws of the smoldering spread.

The invention relates to a detection and early warning method for a coal fire high-temperature area. The detection and early warning method for the coal fire high-temperature area comprises the steps that S10, a selected area is set, and an optical fiber detection system, a gas detection system and an infrared detection system are arranged in the selected area; s20, performing periodic detection through an optical fiber detection system; periodic detection is carried out through the gas detection system; periodic detection is carried out through an infrared detection system; s30, respectively forming a temperature distribution histogram, a gas content histogram and a temperature field distribution isothermal diagram; s40, obtaining the highest temperature value and the highest content value; and S50, according to the conditions of the highest temperature value and the highest content value, whether early warning is carried out or not is judged. The detection and early warning method for the coal fire high-temperature area has the advantage of being high in accuracy.

System and methods for capturing carbon dioxide (CO2) and permanently sequestering through mineral carbonization from coal fired furnace ash.