1344 results about "Spontaneous combustion" patented technology

The invention relates to the technical field of bridge safety, and discloses a cable system bridge fire risk assessment method, system, equipment and medium, which considers the influence of weather factors and road linetype factors on the increase probability of fire accidents, is based on collision accident fire and vehicle spontaneous combustion fire, and fuses the risk probability and risk consequence analysis to obtain a risk risk assessment result. Obtaining the probability that each part of the cable system bridge to be evaluated is influenced by various vehicle fire disasters, and obtaining the fire risk consequence of the parts of the cable system bridge to be evaluated under the vulnerability of the bridge structure caused by different types of vehicle fire disasters when the parts of the cable system bridge to be evaluated have / do not have fire prevention measures in combination with the structural damage and the social economic influence; therefore, the fire risk level of each component of the cable system bridge to be evaluated is obtained, and the highest risk of the most unfavorable component is taken as the fire risk level of the cable system bridge to be evaluated. The method has important guiding significance for cable system bridge fire risk assessment, fire prevention measure design and protection countermeasure formulation.

The invention discloses a shock wave heat loading high-temperature wind tunnel and a test method, and relates to the technical field of high-temperature wind tunnel test equipment. The shock wave heat loading high-temperature wind tunnel comprises a shock tube, a wind tunnel test system, a pressure acquisition system and an air intake and exhaust system; a high-temperature and high-pressure gas source is obtained in a secondary shock wave reflection heating mode, and the total temperature of the obtained heating gas source is higher; the high-temperature wind tunnel realizes gas heating and pressurization completely through shock wave flow, extra electric power and gas requirements are not needed, and the cost of a single test is lower; the high-temperature wind tunnel test gas is premixed, so that the components of the test gas can be accurately controlled, and the purity of the components of the test gas is ensured; the device can obtain a high-temperature high-pressure subsonic flow field and even a supersonic flow field covering wide-range working conditions, can be used for visualization test diagnosis of spray fuel atomization and spontaneous combustion processes under high-temperature crosswind, accurately characterizes physical and chemical characteristic parameters such as fuel atomization characteristics, self-ignition characteristics, flame propagation characteristics and the like, and has a wide application prospect. And test data support is provided for engine combustion chamber spray atomization combustion organization.

According to the vehicle rescue escape system and method, a trigger signal input unit detects the motion state and collision strength of a vehicle, the power supply state and spontaneous combustion state of a vehicle power source and the on-off state of an emergency escape switch in real time, so that a central control unit can collect trigger signals and control the working state of an execution unit; the rescue escape system can be manually started or automatically started, and can quickly respond and unlock a self-absorption lock, pop up a hidden door handle and open a door and a window under various emergency conditions. The backup power supply unit comprises a centralized backup power supply connected with the vehicle power supply and an edge distribution backup power supply connected with the trigger signal input unit and the execution unit, so that when the power supply of the vehicle power supply is abnormal, the centralized backup power supply supplies power to the rescue escape system; the edge distribution backup power supply can also ensure the normal work of the trigger signal input unit and the execution unit, and the reliability and the safety are improved.

The invention discloses a chemical spontaneous ignition-based underground in-situ combustion method for low-permeability oil reservoirs, oil shale and shale oil reservoirs, and relates to the technical field of oil and gas exploitation. The chemical spontaneous ignition composition comprises the following components in percentage by mass: 20%-45% of an ignition agent, 10%-20% of a fuel additive, 8%-12% of a combustion improver, 3%-5% of a catalyst, 2%-3% of an emulsifier and the balance of water. According to the chemical spontaneous ignition-based underground in-situ combustion method for the low-permeability oil reservoir, the oil shale and the shale oil reservoir, through optimal combination of the ignition agent, the combustion improver, the catalyst, the emulsifier and the fuel additive, a spontaneous combustion reaction can be rapidly initiated in the oil reservoir, and a stable high-temperature combustion process is maintained; the method is suitable for exploiting low-permeability oil reservoirs, oil shale, shale oil reservoirs and sandstone reservoirs, the recovery efficiency can be remarkably improved, and the method is particularly suitable for complex oil reservoir conditions where a conventional oil displacement technology is difficult to effectively apply.

The explosion-proof cooling device for the underground coal mine comprises a frame, an air-cooled condenser, a compressor unit, a shell-and-tube evaporator and a base are installed in the frame, and a programmable control box is installed at the left end of the frame; the air-cooled condenser is used for heat dissipation and cooling of coolant compressed gas; the compressor unit is used for compressing a gas refrigerant and comprises an oil separator, a double-screw compressor, a first motor, a double-loop reversible vacuum electromagnetic starter, a liquid storage tank, a first drying filter and a second drying filter; the shell-and-tube evaporator is used for heat exchange between high-temperature nitrogen and a low-temperature refrigerant. According to the cooling device, a refrigerant used when the cooling device works can be recycled, the investment of resources and cost of the part is reduced, the refrigeration cost is saved, nitrogen in the device can rapidly and continuously release low-temperature nitrogen, the air temperature in a large range of a mining area is efficiently achieved, air is inerted, the oxidation spontaneous combustion rate of coal is reduced, and gas explosion is restrained; the mining area safety is improved.

The invention provides a flight device. The flight device comprises a body; the energy storage assembly is arranged outside the machine body, the energy storage assembly comprises a connecting mechanism and a battery, and the connecting mechanism is installed on the machine body; the connecting mechanism has a locking state and an unlocking state, the connecting mechanism is configured to be switched between the locking state and the unlocking state, in the locking state, the connecting mechanism is connected with the battery, in the unlocking state, the connecting mechanism is separated from the battery, and therefore the battery is separated from the machine body. Through the arrangement, when emergency situations such as spontaneous combustion of the battery occur, the connecting mechanism can be switched to the unlocking state, and the connecting mechanism and the battery are both located outside the machine body, so that the interior of the machine body can be effectively isolated from a fire source, and meanwhile, the battery is rapidly abandoned.

The invention discloses a preparation method of a perovskite type high-temperature-resistant CO2 methanation catalyst, which comprises the following steps: firstly, preparing CaZrO3, then dissolving CaZrO3 powder, a nickel source, a soluble organic fuel and a certain amount of ethylene glycol in deionized water according to a molar ratio of 1: (0.2-0.8): (0.1-0.5), stirring to obtain a dispersion liquid, then putting carrier monoclinic ZrO2 powder in the dispersion liquid, and stirring to obtain the perovskite type high-temperature-resistant CO2 methanation catalyst. The preparation method comprises the following steps: uniformly mixing the raw materials, carrying out ultrasonic treatment for 5-12 hours, heating the obtained mixture at 300-550 DEG C until spontaneous combustion, carrying out high-temperature calcination at 800-900 DEG C for 1-2 hours after flame is extinguished, collecting the calcined product, and carrying out ball milling and granulation to obtain the NiO-CaZrO3 / ZrO2 catalyst with a certain mesh number. According to the preparation method of the catalyst, a solution combustion method is introduced in the preparation process, so that active components of the prepared catalyst are fully dispersed, and further high-temperature calcination is performed on the basis, so that the active components are stably anchored on the surface of the ZrO2 carrier, and the catalytic activity and the stability of the catalyst are improved.

The invention discloses an emergency protection device for BMS module lithium battery equipment, and relates to the technical field of lithium battery equipment, the emergency protection device comprises a shell, the top end and the bottom end of the shell are detachably provided with a top cover and a bottom plate through screws respectively, rectangular grooves are symmetrically formed in the outer surfaces of the two opposite sides of the shell in a penetrating mode, and sliding blocks are slidably installed on the inner walls of the two rectangular grooves; sealing plates used for shielding the rectangular grooves are fixedly mounted on the outer surfaces of the sliding blocks, and a turning plate is rotationally mounted between the two sliding blocks through a rotating shaft; the upper surface of the turning plate is used for mounting a main battery pack; the lower surface of the turning plate is used for mounting an auxiliary battery pack; a turnover mechanism is installed between the sliding block and the shell, and a monitoring mechanism is installed on the top cover. The temperature of the main battery pack during working is monitored through the monitoring mechanism, when the temperature of the main battery pack during working sharply rises to an ignition point, the monitoring mechanism unlocks the sliding block through the limiting mechanism, the turnover mechanism drives the turnover plate to turn over by 180 degrees, the elastic conductive column of the main battery pack reaching the ignition point is disconnected from the conductive contact, and the main battery pack is prevented from being ignited. Meanwhile, the turnover plate, the baffle and the bottom of the shell form a closed space to isolate oxygen and avoid ignition and spontaneous combustion of the main battery pack.

The invention discloses a coal face goaf spontaneous combustion three-zone monitoring method, a coal face comprises a goaf, a working face, an open-off cut, an air inlet crossheading and an air return crossheading, a top plate roadway is arranged in a top plate of the coal face, or a bottom plate roadway is arranged in a bottom plate of the coal face, the top plate roadway or the bottom plate roadway forms a drilling roadway, and the drilling roadway or the bottom plate roadway forms an air return roadway. The monitoring method comprises the steps that S1, a plurality of drilling channels are drilled from a drilling roadway to a goaf, and a plurality of drilling terminals are located in the goaf and are sequentially distributed at intervals in the direction parallel to the length direction of a cut hole; s2, a plugging assembly and an exhaust pipe are arranged in the drilling channel; s3, regularly sampling the gas in the detection cavity by using a gas sampling device to obtain an oxygen concentration value, and stopping sampling until the detected oxygen concentration value is lower than a preset oxygen concentration threshold value; and S4, determining the distribution range of the spontaneous combustion three zones of the goaf of the coal face according to a corresponding change rule between the detected oxygen concentration value and the advancing distance of the coal face.

The invention discloses a rapid cold start flameless combustion furnace and a control method, and relates to the technical field of combustion equipment.The rapid cold start flameless combustion furnace comprises a combustion furnace body and an inductance heating assembly, a combustion cavity is formed in the combustion furnace body, and the combustion cavity is provided with an air jet nozzle, a fuel nozzle and a tail gas exhaust port; the air jet nozzle and the fuel nozzle are oppositely distributed on the two opposite sides of the combustion cavity and arranged in an opposite jet mode, and the furnace wall of the combustion cavity is a metal component. The inductance heating assembly comprises an inductance coil spirally surrounding the periphery of the combustion furnace body, and the area surrounded by the inductance coil corresponds to the combustion cavity. According to the flameless combustion furnace, the furnace wall of the combustion cavity which is a metal component is heated through the inductance coil, so that the temperature in the combustion cavity is rapidly increased, the temperature of the furnace wall of the combustion cavity is higher than the spontaneous combustion temperature of fuel, the fuel is ignited, and rapid cold start and stable combustion of the flameless combustion furnace are achieved.

The invention provides a charging control method and device for a battery changing cabinet, electronic equipment and a storage medium, and the method comprises the steps: obtaining the environment information of the environment where the battery changing cabinet is located in a preset time period, and determining the severe grade of the environment where the battery changing cabinet is located based on the environment information; determining that the severity level is smaller than a preset level threshold; and obtaining cabinet body temperature information of the battery replacement cabinet and battery temperature information of the batteries in the battery replacement cabinet, and performing hierarchical control on the charging rate of the batteries in the battery replacement cabinet based on the cabinet body temperature information and the battery temperature information. Charging of the batteries in the battery changing cabinet is controlled through the environment information, the cabinet body temperature information of the battery changing cabinet and the battery temperature information of the batteries in the battery changing cabinet, the spontaneous combustion risk of the battery changing cabinet and the batteries caused by climate factors is reduced, it is ensured that the batteries can achieve reasonable charging rates under various environment conditions, and the charging efficiency of the batteries is improved. Therefore, the service life of the battery changing cabinet and the battery is effectively prolonged, and the overall safety and reliability are further improved.

The invention relates to a CFD numerical simulation-based pressure-bearing loose combustible material oxidation spontaneous combustion simulation method, and belongs to the technical field of combustible material oxidation spontaneous combustion simulation. Physicochemical property testing is carried out on combustible materials, oxidation experiments are carried out on the loose combustible materials under different pressure-bearing conditions, and physical parameters are collected; temperature, gas concentration and pressure parameters of combustible materials are collected in real time, and pressure-bearing oxidation spontaneous combustion parameters are calculated; fitting a function relationship between the oxidation spontaneous combustion parameter and the combustible body temperature; establishing a CFD numerical simulation model of multi-physics field coupling; according to the geometric dimension of the simulation model, dividing calculation grids, setting simulation boundary conditions and initial conditions, and performing CFD numerical simulation calculation; and outputting a three-dimensional dynamic distribution diagram of the temperature field, the heat conductivity coefficient field, the permeability field, the heat release intensity field and the gas concentration field in the simulation process, and analyzing a simulation result to obtain the oxidative spontaneous combustion characteristics of the pressure-bearing loose combustible.

The invention discloses a high-altitude steeply inclined coal mine fire monitoring system, and the system comprises a processing module which is connected with a transmission node, and the processing module is used for correspondingly receiving sensing data generated by a sensor module according to the transmission node, and accumulating the sensing data (I) according to a set period; monitoring an accumulation behavior on the sensing data, and identifying whether accumulation interruption exists in the sensing data (II); analyzing the accumulated sensing data, at least obtaining temperature accumulation data and oxygen content accumulation data from the sensing data, and comparing the temperature accumulation data and the oxygen content accumulation data with set reference data to obtain a plurality of groups of comparison results (III); the analysis module is connected with the processing module and used for analyzing the probability of spontaneous combustion according to the obtained comparison results; and the early warning module is connected with the analysis module and is used for carrying out early warning according to the obtained probability of spontaneous combustion.

The invention provides a dual-fuel combustion nozzle which comprises a nozzle shell connected with a cooling plate. A hydrogen fuel gas collecting cavity and a liquid hydrocarbon fuel pipe which are coaxial are arranged in the nozzle shell; a first air channel is formed between the inner wall of the hydrogen fuel gas collecting cavity and the liquid hydrocarbon fuel pipe, and a swirler is arranged in the first air channel; a second air channel is formed between the outer wall of the hydrogen fuel gas collecting cavity and the inner shell of the nozzle shell; a liquid hydrocarbon spray hole is formed in the outlet end of the liquid hydrocarbon fuel pipe and is positioned in a space formed by the expansion section of the venturi structure; a hydrogen spray hole is formed in the side wall, close to the top end, of the hydrogen fuel collecting cavity. The invention further provides an engine combustion chamber comprising the combustion nozzle. According to the invention, efficient mixing of hydrocarbon fuel and hydrogen fuel can be realized, the phenomenon of backfire spontaneous combustion is avoided, the flameout boundary is widened, and stable switching of multiple working modes is realized.

The invention belongs to the technical field of electric energy metering, and particularly relates to a high-safety electric energy metering box, which comprises a box body and a safety assembly, and is characterized in that a meter is mounted in a mounting chamber in the box body, penetrates through the side wall of the mounting chamber through a connecting wire, and is connected into an external power grid system; a storage chamber is arranged on the back face of the box body, a safety gap is formed between the storage chamber and the installation chamber, and an information storage device is arranged in the storage chamber and connected with the meter through a transmission wire. When the meter has an overheating spontaneous combustion accident, a mounting chamber where the meter is located and a storage chamber where an information memory is located are physically separated through a safety gap; and the propelling equipment is started to drive the moving plate to move downwards to physically cut off the transmission wire, so that the information memory and the meter are completely separated, high-temperature flames are prevented from spreading along the transmission wire to threaten the information memory, the loss is further reduced, and the information safety is ensured.

The invention relates to the technical field of immersed temperature control and thermal runaway prevention of a power battery of a new energy automobile. The technical problems to be solved are clearly reflected that the non-uniform heat dissipation and spontaneous combustion of the power battery are two technical problems of a new energy automobile, and the technology provided by the invention can enable the heat dissipation of the power battery to be good and prevent spontaneous combustion. The technical scheme for solving the problem is characterized in that a buffer material is used for protecting the bottom of a battery pack, a circulating temperature control system is filled with fluorinated liquid, elements such as battery cells in the battery pack are soaked in the fluorinated liquid, and according to the temperature requirement of the battery cells, the fluorinated liquid exchanges heat with a heat pump system, a heater and a driving motor, so that the battery pack is heated. The fluorinated liquid is recycled to raise or lower the temperature of elements such as the battery pack. When the battery cell is abnormally high in temperature or thermal runaway, the battery cell is extinguished and cooled by means of quick discharge, water injection into the battery pack and the like. The device is used for heating or circularly cooling elements such as a power battery and preventing spontaneous combustion of a power battery pack.

The invention relates to the technical field of mining local fan air duct air volume self-adaptive adjusting equipment, in particular to a mining local fan air duct air volume self-adaptive adjusting device. According to the technical scheme, the self-adaptive adjusting device for the air volume of the air duct of the mining local fan comprises a fan body, a radiator, an installation support, an electric adjusting air door, an air storage bin, the air duct, an environment detection module, an air speed detection module and a control module, the radiator is arranged on one side of the fan body, and the installation support is arranged on the bottom face of the fan body; an electric adjusting air door is arranged on one side of the ventilator main body; the environment sensing module is arranged, triple redundancy design is adopted, when the gas concentration is abnormal, whether the gas concentration is a spontaneous combustion symptom or not can be discriminated in combination with temperature data, or the coal rock collapse risk is pre-judged through the dust concentration change, and the safety interlocking response time is shortened.

The invention discloses a coal oxidation dynamic evolution multi-parameter real-time monitoring device under ultraviolet radiation, the device comprises a monitoring unit and a reaction unit, the monitoring unit comprises an ultraviolet radiation module, a gas monitoring module, a heat monitoring module, an active group monitoring module, a free radical monitoring module and a control unit, the reaction unit comprises a multi-channel in-situ reaction module and a coal sample reaction cavity, and a monitored coal sample is arranged in the coal sample reaction cavity; the ultraviolet radiation module is used for generating a controllable ultraviolet radiation field on the surface of the coal sample; the gas monitoring module is used for monitoring gas components released in the coal oxidation process in real time; the heat monitoring module is used for monitoring temperature distribution inside and on the surface of the coal sample; the active group monitoring module is used for tracking dynamic evolution of functional groups on the surface of the coal sample. Accurate and high-timeliness coal sample dynamic evolution monitoring is realized, and key data support is provided for revealing a coal oxidation chain reaction mechanism and a spontaneous combustion process.

The invention relates to the technical field of battery protection, in particular to a UPS (Uninterrupted Power Supply) battery pack with a fireproof function, which comprises a shell, a placement frame and the like, an opening is formed in the front side of the shell; a placement frame is slidably connected in the shell; and a plurality of clapboards are arranged on the placing rack. When a certain battery abnormally heats, the temperature detected by a temperature sensor rapidly rises, at the moment, an electromagnet stops fixing a push block, the push block turns over to push a limiting block away from a first groove, a placement frame and a wiring board are pushed to move forwards through a first elastic piece, and the placement frame and the wiring board are fixed. The abnormal battery is limited by the pushing block which is overturned to be in a transverse state, so that the abnormal battery cannot move forwards along with the placing frame, the intact battery can move forwards along with the placing frame, and after the placing frame is pushed away from the shell by the first elastic piece, the abnormal battery loses the support of the partition plate and falls into the isolation cavity. The abnormal battery is extinguished and cooled through the extinguishment dry powder in the isolation chamber, so that the undamaged battery is prevented from being affected by spontaneous combustion of the abnormal battery.

The invention discloses an outdoor low-voltage power distribution cabinet with a spontaneous combustion protection structure, and relates to the technical field of power distribution cabinets, the outdoor low-voltage power distribution cabinet comprises a cabinet body, the front side of the cabinet body is provided with a protection door, the side of the cabinet body is provided with a heat dissipation groove, the top side of the interior of the cabinet body is rotatably connected with a rotating barrel, and the interior of the rotating barrel is provided with a fire extinguishing airbag; and a rotating mechanism capable of discharging carbon dioxide gas in the fire extinguishing air bag in a large range is arranged in the cabinet body. According to the outdoor low-voltage power distribution cabinet with the spontaneous combustion protection structure, after a fire occurs, carbon dioxide gas stored in the fire extinguishing air bag is discharged, so that the fire in the cabinet body is controlled, when an adjusting plate moves under the threaded connection effect of a threaded rod, a toothed plate is synchronously driven to move, and the spontaneous combustion protection effect is improved. At the moment, the toothed plate can drive the rotating barrel to rotate through the toothed ring meshed with the toothed plate, and when the rotating barrel rotates, gas leaked from the fire extinguishing airbag can be diffused in a larger range, so that the fire control efficiency is improved.

The invention discloses a continuous mining and continuous filling recovery section coal pillar mining method and system, and the method comprises the steps: determining the position of a coal pillar working face crossheading, and carrying out gob-side entry driving along the positions, close to goaf, of the two sides of a coal pillar; grouting and plugging the goaf before tunneling, and injecting a flame retardant; side filling roadway forming is conducted on the goaf through coal gangue, and a supporting system of a coal pillar working face crossheading is constructed; supporting a coal pillar working face crossheading; the section coal pillars are recovered by adopting a continuous mining and continuous filling process, and coal bodies are replaced by filling bodies, so that the whole coal pillar recovery-filling process is ensured to be smoothly carried out until all coal resources are recovered. According to the method, the coal recovery rate can be increased, the problems of spontaneous combustion danger and toxic and harmful gas over-limit caused by goaf air leakage are solved, the fire hazard caused by sparks generated when a fully-mechanized coal winning machine touches old roadway anchor rods in the roadway tunneling process is solved by injecting the flame retardant, waste coal gangue can be effectively utilized, the problems of environmental pollution and the like are avoided, green mining is achieved, and the method is suitable for large-scale popularization and application. The mine service life is prolonged.

The invention belongs to the technical field of vehicle safety, and discloses a new energy vehicle assembled battery pack safety protection device which comprises a bottom shell, a top shell and a trigger structure. According to the battery pack cooling device, through the arranged trigger structure, when the temperature in the battery pack rises and exceeds the cooling effect of the liquid cooling plate, the electric control valve located on the lower portion is opened at the moment, the lower pipe pushes the circular plate to move upwards, then the circular plate seals the vent holes, and at the moment, external air cannot enter the battery pack from the vent holes and the vent holes; then, an electric control valve above is controlled to be opened, compressed nitrogen in a compression tank is sprayed out at the moment, air in the battery pack and a battery module connected with a heat conduction block are cooled at the same time, the air in the battery pack is pushed outwards by the compressed nitrogen at the moment, and the air in the battery pack is cooled; the oxygen content in the battery pack is further reduced, so that the battery pack is prevented from spontaneous combustion, and the ignited battery module is extinguished at the same time.

The invention provides a method and a system for judging a spontaneous combustion dangerous area of a goaf of a coal face, and relates to the technical field of coal mine safety monitoring. Geographic information system software is used for generating an initial geographic map, and a regular three-dimensional grid is created on the basis of the initial geographic map; accurate positioning and data consistency management of the goaf of the coal face are effectively realized, the abnormal sampling points can be accurately identified by setting a specific wavelength range, capturing spectral data of each sampling point by using an infrared spectrum and calculating the relative radiation intensity and the radiation deviation degree of each sampling point, and the accuracy of the abnormal sampling points is improved. Through obtaining neighbor sampling point data of an abnormal sampling point, calculating a uniform distribution index, realizing risk grade marking of the abnormal sampling point, comprehensively considering distribution density, relative radiation intensity and geographic position information of the abnormal sampling point, and generating a spontaneous combustion risk index, comprehensive assessment and timely early warning of goaf spontaneous combustion risk are realized.

The invention relates to the field of cables, in particular to a safety cable connector with an anti-drop function, which comprises a female head, a connecting sleeve and a male head, the surface of the female head is connected with a connecting sleeve; the connecting sleeve is slidably connected with a male head, and the surface of the male head is fixedly connected with a plurality of guide strips; grooves corresponding to the guide strips are formed in the inner sides of the connecting sleeves, and magnetic attraction pieces capable of being matched with each other are arranged at the deepest positions of the grooves and the ends of the guide strips. A heat conducting ring and the like are also included; the contact column of the female head is fixedly connected with a heat conduction ring. When the contact column and the connecting ring are overloaded and generate heat abnormally, continuous heat is transmitted to the expansion ring through the heat conducting ring, the expansion ring is gradually extended rightwards after being heated, the expansion ring extrudes and pushes the round rod rightwards, then the round rod pushes the connecting disc and the connecting ring rightwards, the connecting disc slides along the inner side of the male head, and the male head is connected with the male head. And the circuit is cut off, so that continuous temperature rise is prevented, and a spontaneous combustion event is avoided.

The invention belongs to the technical field of coal mine disaster prediction, and discloses a method and a system for judging a spontaneous combustion dangerous area of a goaf in a working face withdrawing stage. According to the method, influence of goaf air fracture development and air leakage channel formation on a spontaneous combustion dangerous area is determined; verifying the influence of residual coal distribution on the spontaneous combustion dangerous area of the goaf; determining the influence of void ratio and distribution on the spontaneous combustion dangerous area distribution of the goaf after the coal caving amount of the working face is reduced; the working face shrinks in the withdrawing period; after the end hydraulic support is withdrawn in the later period, the coal body collapses to block an air return channel, and full-negative-pressure ventilation of the working face is switched into positive-pressure ventilation of a local ventilator; and importing the void ratio and the residual coal distribution change formula into FLUENT numerical simulation software by utilizing a CFD-DEM simulation result. Technical basis is provided for judgment of the spontaneous combustion high-danger area of the working face from end mining to support removing goaf, and standardization and normalized development of the industry technology are assisted; and the generation of gases such as CO and CO2 caused by spontaneous combustion of the goaf is avoided.

The invention discloses a fireproof flame-retardant technology for electric vehicles. The invention relates to the technical field of fire prevention and flame retardance of electric vehicles (non-new energy electric vehicles). Along with increasing quantity of various electric two-wheeled vehicles, tricycles and four-wheeled vehicles, spontaneous combustion of the electric vehicles and ignition of surrounding vehicles occur occasionally, and serious property loss is caused. Corresponding flame retardants are added into raw materials for manufacturing parts such as plastic parts, rubber parts, sponge parts and leather parts of the electric vehicle to manufacture the parts with flame retardance, fireproof paint is sprayed on the inner surfaces and the outer surfaces of metal parts and the plastic parts of the electric vehicle, and fireproof electric wires are adopted as wires of electric elements of the electric vehicle. And a series of measures such as sleeving the fireproof wire with a fireproof cloth sleeve and protecting the battery compartment by using a fireproof heat-insulating material are taken, so that the whole electric vehicle has fireproof and flame-retardant functions. When electric vehicle wires are short-circuited and on fire, batteries are spontaneously combusted or adjacent vehicles are combusted, the battery is not ignited.

The invention discloses a coal storage and transportation intelligent management method and system, relates to the technical field of intelligent management systems, and aims to solve the problems of lack of environment monitoring, scheduling decision lag, extensive safety response and serious data island in the prior art. The method comprises the following steps: collecting the physical state, environmental parameters and operation behavior data of a coal storage yard in real time through a distributed sensor network; constructing a three-dimensional dynamic digital twinborn model and inputting the model into a time sequence neural network to predict the risk of spontaneous combustion, collapse or dust explosion in the future; and generating a dynamic scheduling instruction in combination with the task priority and the equipment state, and triggering a multi-level security response mechanism. The system comprises a sensor network module, a data fusion modeling module, a risk prediction module, a scheduling optimization module, and a closed-loop control and safety response module. According to the scheme, safety early warning preposition, scheduling decision intelligent optimization and resource energy efficiency collaborative improvement in the storage and transportation process are achieved, and the response capability and operation reliability of the coal supply chain are remarkably enhanced.

The utility model relates to the technical field of battery pack flame-retardant protection, in particular to a new energy automobile battery pack flame-retardant protection structure which comprises an aerogel flame-retardant sheet arranged on the inner side face of a flame-retardant box, a positioning plate arranged on the side face of the flame-retardant box, a limiting frame arranged in a sealing cover, a spring arranged in the limiting frame and an elastic plate arranged at one end of the spring. A supporting rod is arranged on the surface of the elastic plate; the new energy battery pack has the beneficial effects that after the new energy battery pack is used for a long time and is spontaneously combusted due to special reasons, the aerogel flame-retardant sheet can be used for carrying out primary flame retardance on the new energy battery pack, after the new energy battery pack is strongly spontaneously combusted, the aerogel flame-retardant sheet is damaged, the thin plate can be combusted and damaged, and then the elastic plate can lose limitation; therefore, the flame-retardant powder in the limiting frame can be sprayed out through cooperation of the elastic plate and the spring, spontaneous combustion of the new energy battery pack can be extinguished, and the flame-retardant effect of the new energy battery pack is greatly improved.

The invention discloses a fire extinguishing system for an energy storage battery cabin of an energy storage power station, and belongs to the technical field of fire fighting, the fire extinguishing system comprises a battery storage cabin, a cabin door is mounted outside the battery storage cabin through hinges, and a carbon dioxide generator and a fire extinguishing agent spraying box are fixedly mounted on the top surface of the battery storage cabin; an exhaust plate and a fire extinguishing agent spraying plate are arranged at the bottom of the carbon dioxide generator and the bottom of the fire extinguishing agent spraying box correspondingly and located on the inner side of the battery storage bin. According to the fire extinguishing device, the driving assembly and the extrusion assembly are arranged in a matched mode, through the design, the interior of the battery storage bin can be monitored in real time, when spontaneous combustion of a battery occurs, the fire extinguishing system can be controlled to be started in time to treat the spontaneous combustion condition, and the fire extinguishing mode of combining a dry powder extinguishing agent and carbon dioxide gas is adopted; the fire extinguishing effect can be greatly improved, meanwhile, gas and a fire extinguishing agent can be rapidly diffused and distributed in the cabin, and the actual application effect of the system is improved.

The present invention discloses a coal mine risk analysis method, equipment and medium based on Internet of Things monitoring data, which relates to the technical field of coal mine risk analysis, and comprises the following steps: obtaining a thermal imaging image of a coal mine goaf in real time, marking the thermal image of the goaf, and performing spontaneous combustion risk monitoring and analysis based on the thermal image of the goaf; performing a first division processing on the thermal image of the goaf, calculating the regional average temperature based on the processed thermal image of the goaf, and obtaining temperature data of the first goaf block; performing data processing on the temperature data of the first goaf block, and obtaining temperature data of the second goaf block; and predicting and analyzing the spontaneous combustion risk of the coal mine goaf based on the temperature data of the second goaf block. The present invention is used to solve the problem that the existing coal mine risk analysis technology cannot perform comprehensive monitoring and analysis of all goafs through thermal imaging images when analyzing the spontaneous combustion risk of coal mine goafs, and at the same time, cannot perform predictive analysis of the spontaneous combustion risk of all goafs by using thermal imaging images.