1917results about "Chemical analysis using combustion" patented technology

The invention is suitable for the technical field of performance detection, and provides a method for detecting the ablation resistance of a burning-resistant nozzle and an arc contact, and the method comprises the steps: collecting a temperature field matrix, an arc image sequence, an electrical parameter time sequence and a surface displacement curve of an ablation region, and generating a multi-modal data set; based on the data set, extracting spatial features of the ablation core region through a cavity convolution layer and a channel attention mechanism; inputting a preset bidirectional LSTM network, fusing thermal stress data of the COMSOL simulation model to drive gating weight update, and extracting time sequence evolution characteristics; generating a space-time fusion feature vector containing the temperature field gradient, the arc form change rate and the surface roughness evolution feature; inputting the space-time fusion feature vector, the thermal stress distribution data and the material phase change threshold parameter into a constructed ablation prediction model for training; the ablation prediction model after training is completed is optimized; and a performance prediction result is generated in real time by using the optimized ablation prediction model, so that the detection accuracy is effectively improved.

The invention discloses a real fire test device and test method for a large-diameter cable test model. The device comprises a multi-dimensional adjusting system, a real fire control system, a temperature monitoring system, a calorimetric and flue gas purification system, a high-temperature-resistant video recording device, a thermal imager and the large-diameter cable test model. The multi-dimensional adjusting system comprises a stand column fixed with a guide rail, a cross beam capable of moving along the guide rail, and a height adjusting system and an angle adjusting system capable of adjusting the height and the angle of the large-diameter cable test model; the real fire control system can control the opening degree of a premixing burner and the frequency of a fan so as to control the intensity of a fire source, so that real fire scenes of different types of vehicle fires are provided; before the large-diameter cable test model is tested, a space temperature field needs to be calibrated, and then the space position of the large-diameter cable test model is determined. According to the invention, a scheme can be provided for the fireproof performance test of the large-diameter cable test model of the bridge in a real space state, and technical support is provided for the fireproof design of the large-diameter cable test model of the large-span bridge.

The invention provides low-carbon fuel blending coupling combustion test equipment and method, and the equipment comprises a blending fuel feeding system which is used for blending solid-phase, liquid-phase and gas-phase low-carbon fuels with fossil solid fuels or other solid fuels in proportion; the one-dimensional combustion furnace is used for coupling combustion of the blended fuel; the flue gas treatment system is used for carrying out cooling, dust removal, desulfurization, denitration and carbon dioxide adsorption and trapping treatment on flue gas generated by coupling combustion; the control cabinet is used for controlling the stable and safe operation of the whole experiment platform; the low-carbon coupling combustion test system and method and the coupling combustion low-carbon technology have the beneficial effects that the coupling combustion condition that the actual boiler is internally mixed with low-carbon fuel is simulated by adopting a feeding and conveying mode of accurately controlling the blending combustion proportion, and the low-carbon coupling combustion test system and method and the coupling combustion low-carbon technology are formed; the device has multiple innovative functions of controlling the blending combustion ratio, efficiently coupling combustion, comprehensively purifying flue gas, adsorbing and trapping carbon dioxide, saving energy, reducing carbon and the like.

The invention relates to the technical field of combustion equipment state monitoring, in particular to a combustion state monitoring method and system based on vibration and noise fusion analysis, and the method comprises the steps: collecting a combustion signal in real time through a vibration sensor and a broadband noise sensor, extracting a characteristic frequency band through noise reduction and filtering, and obtaining a combustion state; fPGA hardware-level clock synchronization is adopted to realize time alignment of bimodal signals, a vibration-noise joint feature matrix is constructed and multidimensional coupling is carried out, a combustion state feature vector is generated through a mixed deep learning model, a combustion state is determined based on a bimodal confidence weighting decision, and a linkage control instruction is generated during interruption. The system comprises a signal acquisition synchronization unit, a feature fusion and modeling unit, a state decision and instruction generation unit and a safety linkage execution unit, executes a method and activates a standby safety system, solves the problems of asynchronous bimodal data and insufficient monitoring precision, and improves the combustion state monitoring accuracy and safety response efficiency.

The invention discloses a method for automatically detecting the combustion performance of a flooring material based on a bimodal space-time network. The method comprises the following steps: S1, synchronously acquiring and calibrating bimodal data; wherein the bimodal data comprises data acquired by a visible light camera and data acquired by a thermal infrared imager; s2, performing visible light channel flame segmentation based on the data acquired by the visible light camera in the step S1; s3, performing infrared channel temperature field calibration and carbonization analysis on the basis of data acquired by the thermal infrared imager in the step S1; s4, performing spatio-temporal feature fusion on the flame mask obtained in the step S2 and the temperature field data in the step S3; and S5, performing three-dimensional evaluation according to the dynamic prediction result generated in the step S4, and finally evaluating the combustion performance of the flooring material. According to the method, automatic detection of the combustion performance of the flooring material can be realized through the steps S1 to S5, and the problem of large manual observation error in a flooring material combustion test can be solved.

The invention belongs to the technical field of coal field fire evolutionary analysis, and particularly provides a visual coal field fire evolutionary process analog simulation test device and method. The test device comprises a test bench, a physical similarity model, a fiber bragg grating temperature and stress integrated monitoring system, a multi-gas monitoring system, an image and video monitoring system and a computer analysis system. A plurality of opening frames are sequentially fixed to form test box bodies, the physical similarity model is arranged in the test box bodies, the inclination angle of the test box bodies is adjusted through an inclination angle adjusting mechanism, and the gas supply system and the ignition system are connected between the test box bodies. The fiber bragg grating temperature and stress integrated monitoring system, the multi-gas monitoring system and the image and video monitoring system are respectively in signal connection with the computer analysis system. According to the invention, visualization of coal field fire evolution processes under different conditions can be realized, and real-time monitoring of change rules of a temperature field, a seepage field and a fracture field in the coal field fire evolution processes under different conditions can be realized.

The invention discloses a petrochemical enterprise liquid fuel leakage and overflow and three-phase foam extinguishing agent oil bath / flowing fire extinguishing dynamic characteristic experimental device. Comprising a foam fire extinguishing system, a pool fire generation system, an overflow control system, a wind speed adjusting system, a spreading convergence system, an image acquisition system, a temperature acquisition system, a radiation heat flow acquisition system, a gas concentration acquisition system, an air velocity acquisition system, an oil film thickness acquisition system, a flow spreading monitoring system and a coordination control system. The experimental device is used for liquid fuel leakage, overflow and combustion under the influence of multiple parameters, and the gas-liquid-solid three-phase foam extinguishing agent extinguishing oil pool / flowing fire dynamic characteristics, transient development process and fire extinguishing efficiency. The dynamic fire extinguishing characteristic of the three-phase foam fire extinguishing agent, the coupling process of flowing, combustion, heat and mass transfer and the like under the influence of multiple factors and the spreading mechanism are disclosed, a theoretical basis is provided for perfecting fire prevention and control of chemical enterprises, and the fire rescue capacity is improved.

The invention relates to cable pyrolysis test equipment in the technical field of cable pyrolysis. The cable pyrolysis test equipment comprises a contact gas detection device, a non-contact gas detection device, a cooler, a gas collection bottle, a gas collection sleeve and a high-pressure bottle, the gas collection bottle comprises a bottle body part and two bottle neck parts, the bottle body part is made of a transparent heat-resistant material capable of expanding along with internal pressure, outer ports of the two bottle neck parts are respectively provided with a gas inlet and a gas outlet, and the non-contact gas detection device performs gas detection corresponding to the bottle body part; the gas collection sleeve comprises a heat transfer sleeve section, two heat insulation sleeve sections and two transition sleeve sections, the outer end walls of the two transition sleeve sections are sleeved with sealing hoops in a clamped mode, the end walls of the two transition sleeve sections are provided with a gas inlet pipe and a gas outlet pipe respectively, the gas inlet pipe is correspondingly communicated with a bottle opening of the high-pressure bottle, and the gas outlet pipe is correspondingly communicated with a gas inlet of the gas collection bottle; gas discharged from an exhaust port of the gas collecting bottle enters a cooler to be cooled and then is guided into a contact type gas detection device; according to the test equipment, characteristic gas can be more completely collected, and the detection diversity and accuracy are improved.

The invention discloses a composite fiber tensile property testing device, which relates to the technical field of composite fiber tensile property testing tools, and comprises a pedestal and a door frame arranged on the top of the pedestal, a test box is installed above the mounting groove through a bracket, a lifting beam is slidably installed on the upper part of the door frame, a tension sensor is installed on the bottom surface of the lifting beam, a pull rod is installed on the bottom end of the tension sensor, and a clamping mechanism is installed on the mounting seat; a moving seat is installed on the driving seat of the linear motor, and a flame-spraying mechanism is installed on the moving seat; the invention facilitates effective clamping and fixing of the detected composite fiber through the cooperation of the clamping mechanism with the tension sensor and the pull rod, effectively prevents the situation that the clamping end of the composite fiber material breaks first during traditional chuck clamping testing, and can automatically increase the clamping force of the locking shaft on the composite fiber belt as the tension acting on the composite fiber belt increases, effectively preventing the end of the composite fiber belt from loosening or breaking first due to excessive tensile force.

The invention discloses a combustible liquid limit oxygen concentration testing device and method, and the device comprises an electrolyte supply system which comprises a height-adjustable placement platform and a constant-pressure liquid supply module; the combustion system comprises a base and a combustion tube, a partition plate is fixedly connected to the middle position in the combustion tube, an ignition module is detachably connected to the center position of the top face of the partition plate, a lampwick tube is arranged in the ignition module, a lampwick is arranged at the top end of the lampwick tube, and rectification modules are arranged on the top face of the partition plate and the inner bottom of the combustion tube correspondingly; an experimental darkroom is mounted on the top surface of the base; a gas inlet pipe is mounted at the bottom of the combustion pipe; the gas distribution system is connected with the control system; the optical measurement and analysis system is mounted in the experimental darkroom; a waste liquid recovery module is installed at the bottom of the base. A discharge pipe is installed at the bottom of the combustion pipe. The constant-pressure liquid supply module can ensure that electrolyte with stable pressure is provided for the lampwick tube, and the accuracy and repeatability of a test result are ensured.

The invention discloses a combustion experiment system of a rotary fuel gas generator. The combustion experiment system comprises a rotary fuel gas generator experiment table, a supply system, a measurement and control system and an ignition system, the rotary fuel gas generator experiment table is respectively connected with the supply system, the ignition system and the measurement and control system; the supply system is used for stably supplying fuel and oxidant gas to the fuel gas generator on the rotary fuel gas generator experiment table, and the gas flow can be adjusted through a computer; the ignition system is used for igniting the rotary fuel gas generator, the measurement and control system is used for collecting and recording the temperature, pressure and rotating speed of the rotary fuel gas generator during working, and the gas flow and pressure can be adjusted through a computer, so that closed-loop control over the rotating speed of the rotary fuel gas generator is achieved. The combustion performance of the rotary gas generator under different flow rates and equivalence ratios can be simulated, closed-loop control can be carried out on the rotating speed of the rotary gas generator, and accurate control over the combustion process is achieved.

The utility model provides a platform for testing spreading performance of fire extinguishing foam. The platform comprises a test box body with an upper opening, a heating assembly and a test assembly, the test box body comprises a visual loading container and a hollow support located at the bottom of the visual loading container, and the visual loading container is used for loading target combustible liquid; the heating assembly comprises a heating plate, the heating plate is arranged between the bottom of the visible loading container and the hollow support, and the heating plate is used for heating the target combustible liquid in the visible loading container; a foam spray head is further arranged above the visible loading container; and the test assembly is used for recording corresponding data in the foam spreading performance test. The utility model aims to provide a spreadability test platform for different types of fuel oil surfaces and fire extinguishing foam spreadability tests for high-temperature fuel oil surfaces and different types of high-temperature fuel oil combustion surfaces, so as to improve the authenticity of simulating petrochemical fire scenes.

The invention relates to the technical field of crude oil storage tank safety testing, and particularly discloses a crude oil storage tank combustion boiling overflow simulation testing device which comprises an experiment table, an oil tray, a sampling assembly and a measuring assembly, the oil tray is connected to the experiment table, and the measuring assembly comprises a plurality of heat flow meters, a thermocouple, a camera and an infrared camera. The heat flow meters are arranged at the bottom, in the middle and outside the oil pan respectively and used for measuring and obtaining internal and external heat conduction intensity data of the oil pan when crude oil burns. The thermocouple is connected in the oil pan through the mounting frame and used for measuring and obtaining data of the temperature of the center line of the oil pan, the formation position of a hot area and the temperature in the hot area, the camera is used for obtaining image data of the flame height, the splashing area contour and the combustion area contour which change along with time, and the infrared camera is used for obtaining image data of the thermal radiation area contour; the sampling assembly is connected to one side of the oil pan and used for sampling and detecting non-azeotropic oil in a hot area in the oil pan. The device can provide more comprehensive data support for disaster relief.

The utility model discloses a foam spreading and fire extinguishing performance testing device based on a submerged image recognition technology, which comprises an oil tray, an image acquisition device, a magnetic fluorescent sticker and an image processing device, the image processing device is electrically connected with the image acquisition device through a network cable, and the oil tray comprises an oil tray main body, an anti-burning tank and supporting legs, the image acquisition equipment comprises a camera I arranged at the top of the oil pan main body and submerged camera equipment arranged on the inner side of the oil pan main body, the submerged camera equipment comprises a submerged camera II, a submerged camera III and a submerged camera IV, the submerged camera III is arranged in the center of the oil pan main body, and the submerged camera IV is arranged in the center of the oil pan main body; the magnetic fluorescent stickers are arranged at the bottoms of the two side tray walls of the oil tray body. Dynamic changes such as a foam flowing track, a foam fire extinguishing behavior and an ignited fuel area are captured and collected from an upper view angle and a lower view angle of a foam layer, interference of flames on observation or collection of the foam coverage area is avoided, the foam spreading speed in the fire extinguishing process is accurately calculated, and the 25% anti-burning time of a foam fire extinguishing agent is judged.

The utility model provides refractory material inspection equipment convenient to collect damaged test boards, and relates to the technical field of inspection equipment.The refractory material inspection equipment comprises a workbench, a supporting column is fixedly installed at the bottom end of the workbench, a sliding groove is formed in the surface of the workbench, and a storage box is slidably connected into the sliding groove; a pull block is fixedly installed on the surface of the storage box, a better use effect is achieved, during inspection, a clamping plate corresponds to an upper clamping groove and is pushed inwards, when the clamping plate drives a soft cushion to completely slide into the workbench through the clamping groove, then a lifting part is pinched and lifted upwards, a cover plate rotates upwards at the top end of a fixing plate through a hinge A, and the cover plate is clamped through a clamping groove. When the cover plate is completely opened, damaged workpieces can be placed in the collecting box in the process, so that the situations that the inspection work is affected by waste plates easily in the using process and workers need to secondarily collect the waste plates after the inspection work is finished due to the fact that existing inspection equipment is not provided with a waste plate collecting structure are avoided.

The invention provides a portable fire blast risk dynamic identification and danger tracing method and terminal, and the method comprises the steps: collecting positioning data in real time through a GNSS positioning module; a high-speed analog-to-digital conversion chip ADC is used for carrying out high-frequency and synchronous processing on the gas concentration collected in real time; collecting field environment parameters in real time; performing dynamic threshold intelligent judgment to obtain a leakage judgment result, and executing a grading early warning mechanism; recording an inspection track in real time, and carrying out space gas concentration gradient analysis to obtain a gas concentration gradient; calculating a built-in space distance; judging the leakage direction according to the gas concentration gradient data, and intelligently tracing the leakage source according to the leakage judgment result; and uploading the security data to the cloud. According to the invention, the limitation of static and single-threshold alarm of an instrument is solved, and the technical problems of difficulty in spatial continuous sensing and automatic tracing positioning of gas leakage abnormity in a complex inspection environment with dynamic changes of multi-component combustible gas and environmental parameters are solved.

The present invention relates to a process for the quantification and analysis of microplastics contained in aqueous matrices, comprising the magnetic separation of microplastics by the interaction of said microplastics with magnetic iron material particles, forming microplastic / magnetic iron material aggregates, the selective oxidation of the particles of a non-plastic organic nature, and the quantification and / of the separated microplastics.

The invention relates to the technical field of coal underground gasification, and discloses an in-situ UCG process coal body stripping dynamic monitoring physical simulation device and method.A sealed first cavity is formed in an outer bin, and an extraction opening and a first injection opening communicating with the first cavity are formed in the outer bin; a semi-open second cavity is formed in the inner bin, and coal is placed in the second cavity; the horizontal mechanism is arranged on the outer bin and connected with the inner bin; the pressurizing mechanisms are arranged on the inner bin and used for pressurizing the coal body in the horizontal direction and the vertical direction; the weight collecting mechanism is arranged at the bottom of the first cavity, and the open end of the second cavity faces the weight collecting mechanism; according to the coal body stripping characteristic monitoring device, the coal body stripping characteristic in the coal underground gasification process can be monitored in real time, and the control effect of a coal composition on stripping can be analyzed by combining a coal composition and structure space characteristic characterization technology.

The invention discloses a flame-retardant testing method and system for heat-insulating wood and a storage medium, and belongs to the technical field of heat-insulating wood detection. The method comprises the following steps: carrying out comprehensive analysis according to test environment data to obtain a test environment evaluation value, and carrying out matching according to the test environment evaluation value of each test sample to obtain a flame retardant performance evaluation threshold value of each test sample; carrying out comprehensive analysis according to the test sample size data and the test sample state data to obtain a qualification index of each test sample, carrying out comprehensive analysis according to the test environment evaluation value and the qualification index of the test sample to obtain a test accuracy evaluation value, and screening according to each test accuracy evaluation value to obtain each qualified sample; performing comprehensive analysis according to the flame-retardant test data to obtain a flame-retardant performance evaluation value of each qualified sample, comparing the flame-retardant performance evaluation value of each qualified sample with a corresponding flame-retardant performance evaluation threshold value, and performing evaluation feedback on the heat-insulating wood according to a comparison result.

The invention relates to the technical field of subway tunnel fire experiment, and discloses a variable-pressure reduced-size subway tunnel / train compartment double-long-narrow-space fire experiment platform which comprises a tunnel body, a ventilation unit, a monitoring unit, a rail unit and a train unit, and a fire source structure is arranged in the train unit. According to the variable-pressure reduced-size subway tunnel / train compartment double-long-narrow-space fire experiment platform, a fire source structure is arranged, when a fire experiment needs to be carried out, a top fan, two side fans and a main fan are started through a wireless receiver, the wind speed during high-speed running of a train is simulated, and then a remote control igniter is remotely and wirelessly connected; the top fan, the two side fans and the main fan are remotely turned off after a certain time, a real fire disaster is simulated, the fire source structure can simulate the effect that the fire source continuously burns the multiple carriages after a train runs at a high speed, and the authenticity is high.

The invention relates to the technical field of dust combustion, and provides a dust explosion combustion experiment device in order to solve the problems that an existing dust explosion combustion experiment device is insufficient in parameter control precision, and an experiment multi-focus single variable lacks a dust removing mechanism and a safety protection measure, and the dust explosion combustion experiment device comprises an experiment table which is provided with a power chamber and an equipment chamber; one side of the experiment table is hinged with an access door, two sides of the top of the experiment table are provided with conveying main pipes extending to the equipment chamber, a power supply assembly is arranged in the electric power chamber; the protective shell assembly comprises an outer shell and an inner shell; a plurality of exhaust pipes are arranged at the top of the inner shell; the dust generation assembly comprises a plurality of dust storage tanks and an air compressor; the ignition control assembly comprises a pulse igniter, a flame detection feedback circuit and an ignition head; the environment adjusting assembly comprises a box body, an oxygen tank and a humidifier, wherein the oxygen tank and the humidifier are arranged in the box body. The device has the advantages that the dust concentration is accurately regulated and controlled, the environmental parameters are dynamically coupled and controlled, dust residues are rapidly removed, and the experiment safety is high.

The invention discloses a high-temperature turbulent environment particle ignition combustion testing device based on rotational flow flame stabilization, and belongs to the field of combustion testing. The burner is composed of an external rotational flow flame stabilizing device, a central premixing burner, an adjustable turbulence intensity pore plate and a central powder supply pipe. High-temperature and high-speed methane turbulence flames are generated through the central premixing burner, flame stabilization is conducted on the high-temperature and high-speed turbulence flames through the external rotational flow flame stabilization device, and the turbulence intensity of the flames is improved. A high-speed turbulent flow field and a high-temperature flue gas range are constructed through high-temperature and high-speed methane flames, combustion of aluminum particles in the turbulent flow field is achieved, and the combustion rule of the aluminum particles in a complex flow field is researched and tested. The turbulence intensity of high-temperature and high-speed turbulence flame is changed by changing the pore density and the pore diameter of the adjustable turbulence intensity pore plate, and the gas ratio in the central premixing combustor, so that simulation of different fuel gas oxygen enrichment degrees, turbulence intensities and flame temperatures is realized, and test analysis of different turbulence intensities on the combustion process of condensed phase particles is realized.

The invention relates to the technical field of automobile manufacturing, in particular to a flame-retardant coating detection device and a flame-retardant coating detection method. The flame-retardant coating detection device comprises a baffle plate, a supporting plate, a cover plate and a supporting plate which are enclosed to form a closed test cavity. The baffle is provided with a first mounting hole for fixing a fire source, the supporting plate is provided with a corresponding second mounting hole for fixing a temperature detection piece, the cover plate is provided with an insertion hole for mounting a sample, and the supporting plate is provided with a smoke suction assembly. The device is simple in structure and convenient to operate, a fire source and a temperature measuring point can be effectively fixed, the testing efficiency and accuracy are improved, testing is conducted in a closed environment, the smoke suction function is integrated, safe and environment-friendly harmful smoke is guaranteed, the safety and health of operators are comprehensively guaranteed, and environmental pollution is avoided.

The invention discloses a burning metal particle three-dimensional surface panoramic microscopic imaging measurement method. The method comprises the following steps: collecting a dynamic panoramic microscopic image of burning metal particles; the collected panoramic microscopic image is preprocessed, the combustion metal particles are cut out independently from the panoramic microscopic image, and a binary image of the combustion metal particles and a binary image of surface oxides of the combustion metal particles are obtained; modeling combustion metal particles by using a long ellipsoid geometric model to obtain a mapping relation between the three-dimensional surface of the combustion metal particles and the two-dimensional information of the collected panoramic microscopic image; and calculating the three-dimensional surface areas of the combustion metal particles and the surface oxides thereof according to the binary image of the combustion metal particles, the binary image of the surface oxides thereof and the mapping relation. According to the measurement method, the three-dimensional surface reconstruction of the combustion metal particles can be realized, the areas of the combustion metal particles and oxides thereof can be quantitatively obtained, and the dynamic process of oxide fragments on the surfaces of the combustion metal particles can be visualized.

The invention relates to the technical field of material performance detection, and particularly discloses a prediction model for flame retardance of a nonmetal electric energy metering box shell. A BO-XGBoost model for predicting and analyzing the flame retardant property of the nonmetal electric energy box shell material through Raman spectrum data is established, and rapid detection of the flame retardant property of the nonmetal electric energy metering box shell material is achieved.

The invention provides a biomass combustion in-situ measurement method based on spectrum and flame imaging. The biomass combustion in-situ measurement method comprises the following steps that a biomass sample is pretreated and conveyed to a dropper furnace combustion monitoring system through pneumatic conveying; preheating, and monitoring combustion parameters in real time through a temperature control system and a data acquisition system; the synchronous acquisition system is connected with the Fourier transform infrared spectrometer, the ICCD camera and the intermediate infrared camera; spectral information in a flame heat radiation (200 nm to 20 [mu] m) wave band is obtained, and free radical and smoke component images are collected; and finally, comprehensively processing and analyzing the data, and extracting key parameters such as temperature, radiation characteristics, component concentration and the like. According to the invention, multi-parameter in-situ synchronous measurement is realized, combustion surface temperature and radiation characteristics are accurately calculated in combination with an advanced algorithm, and free radical and flue gas component distribution is quantified through an imaging technology. An efficient and reliable technical means is provided for studying a biomass combustion mechanism, optimizing a combustion process and controlling pollution emission, and the biomass combustion device has important scientific research and application values.

To disclose a similar experimental system and method to measure dynamic progression characteristics of spontaneous ignition of coal in the field of coal mining.SOLUTION: A gas supply system blends nitrogen and oxygen into dried air; a coal sample tank adds coal samples based on similar order and span size when a roof collapses and fills a goaf; a programmable heating furnace adjusts a furnace temperature and sets a programmed heating rate; a gas chromatograph analyzes gas samples collected from an exhaust port of a dynamic sample-adding coal tank, and records the temperature of the coal samples collected by a temperature sensor after completing addition of the coal samples; and a data collection host obtains the temperature of coal, exhaust components, and concentrations during a dynamic sample addition process, calculates oxidation oxygen consumption rate, heat generation rate, etc. using an oxidation kinetics method, and determines dynamic rules and progression of spontaneous ignition of residual coal in the goaf during a dynamic mining process. As a result, it is possible to measure dynamic progression characteristics of spontaneous coal ignition by dynamically adding the coal samples.SELECTED DRAWING: Figure 2

The invention relates to the technical field of material performance detection, and particularly discloses a nondestructive testing method for flame retardance of a nonmetal shell of an electric energy metering box. According to the method, a spectrum technology, machine learning and a prediction technology are combined, a plurality of groups of samples are collected for flame combustion tests to obtain sample flame retardant performance data as labels, a spectrometer is used for nondestructive in-situ detection to obtain material surface spectrum data, after pretreatment and feature extraction, various machine learning algorithms are adopted for training and optimization, and the flame retardant performance of the samples is obtained. And finally, a BO-XGBoost model of Bayesian optimization is selected as a prediction algorithm. The non-destructive testing of the flame retardant property of the non-metal shell of the electric energy metering box is realized.

The invention provides a polyolefin base material standard sample for measuring the flame retardant property of a cable material and a preparation method of the polyolefin base material standard sample, and belongs to the field of standard preparation. The sample adopts polyolefin resin as a matrix, and an inorganic flame retardant subjected to silane surface treatment, an anti-dripping agent and the like are added to adjust the combustion rate, so that the product can meet the combustion range corresponding to an actual test. The inorganic flame retardant modified by the silane coupling agent can promote the dispersion of the inorganic flame retardant in the resin and the affinity of the inorganic flame retardant and the resin, improves the uniformity of the material, and also can ensure the structural stability of the material in the combustion process; meanwhile, the lubricant is added, so that the material uniformity and dispersity are improved, and the uniformity and stability of combustion data are ensured; the anti-dripping agent is added, so that unstable data between parallel tests due to the dripping phenomenon of the material during combustion is avoided. The polyolefin-based combustion test standard sample can be applied to calibration of combustion tests of a cone calorimeter, a smoke density experimental box and the like and comparison of experimental data in the same row.

A flow channel controller of a visual solid propellant high-pressure combustion device relates to the technical field of solid propellant high-pressure combustion devices and comprises an annular cylinder, a middle cavity of the annular cylinder is a central circulation channel, and the wall of the annular cylinder is composed of a plurality of flow channel controller concave parts and flow channel controller convex parts which are alternately and annularly distributed in sequence; the concave part of the flow channel controller forms circulating backflow flow channels, and each circulating backflow flow channel is communicated with the central circulation channel; the flow channel controller protruding part is used for changing the flowing direction of internal circulation gas, and the interior of the flow channel controller protruding part is a hollow groove body used for reducing weight. After the internal circulation flowing gas impacts the upper flange end cover of the high-pressure combustion chamber, the airflow flowing area is adjusted through the flow channel controller, and the situation that particles carried by the internal circulation flowing gas affect the observation view range is avoided.