11041 results about "Mixed gas" patented technology

The invention discloses a rotational flow micro-mixing nozzle with built-in plasma combustion supporting and a micro-mixing combustor. The rotational flow micro-mixing nozzle comprises a tangential rotational flow part, a fuel pipe and a mixing pipe which are coaxially arranged, and plasma combustion supporting exciters arranged on the fuel pipe and the mixing pipe. The plasma combustion-supporting exciter is integrated in the nozzle, the structural design of the micro-mixing combustor can be simplified, and the size and complexity of the micro-mixing combustor are reduced; the plasma combustion-supporting exciter is installed at the top of the mixed gas channel of the rotational flow micro-mixing nozzle, stable adjustment of the combustion process under the variable working conditions can be achieved by controlling opening and closing and the discharge intensity of the plasma combustion-supporting exciter when the load changes, and meanwhile the response speed under the different working conditions is increased; air or an oxidizing agent can be fully mixed with fuel at a specific rotational flow degree through rotational flow air flow generated by the tangential rotational flow component, the combustion range can be widened, and the stable combustion effect under the extreme working condition is enhanced.

To provide a technique that can suppress lowering of a rate of collection of adsorbed gas, even under a situation where quantities and densities of mixed gas flowing into an adsorption tower vary.SOLUTION: An adsorption tower control apparatus, which collects specific adsorbed gas using a plurality of adsorption towers, is provided with: a control part that causes an adsorption / desorption step, in which an adsorption step is executed in an adsorption-step tower and at the same time a desorption step is executed in a desorption-step tower, to be repeatedly executed in a plurality of adsorption towers while being transferred; an information obtaining part that obtains information on a property of mixed gas and an operational condition for the adsorption-step tower; and a desorption condition determining part that determines a desorption condition in the desorption-step tower from the information on the property of mixed gas and the operation condition. The control part causes the desorption step to be executed under the desorption condition determined by the desorption condition determining part, and when integrated quantity of adsorbed gas in the adsorption-step tower reaches a predetermined integrated quantity threshold, causes the adsorption-step tower and the desorption-step tower to transfer.SELECTED DRAWING: Figure 1

The invention discloses a high-precision photoacoustic spectrum monitoring method for gas in transformer oil, and relates to the technical field of transformer oil gas monitoring, and the method comprises the following steps: constructing a photoacoustic spectrum detection system, sampling the gas in the transformer oil, and obtaining photoacoustic spectrum data of the gas, the photoacoustic spectrum detection system comprises a near-infrared tunable fiber laser, a photoacoustic cell, a lock-in amplifier and a data acquisition system; preprocessing the acquired photoacoustic spectrum data, and extracting features related to fault diagnosis from the preprocessed photoacoustic spectrum data; and the photoacoustic spectroscopic data of the mixed gas is decoupled by using a chemometrics method. According to the method, the gas photoacoustic spectroscopic data in the transformer oil are collected and analyzed in real time, abnormal conditions in the transformer are found as soon as possible, the mixed gas spectroscopic data are decoupled and separated in combination with chemometrics and a machine learning algorithm, and various gas components are accurately recognized and quantitatively analyzed.

The invention relates to the technical field of hydrogen energy, and discloses an auxiliary-machine-free solid oxide electrolytic hydrogen production system and an auxiliary coal electricity deep adjustment method, the hydrogen production system comprises an SOE heat box system for electrolytic hydrogen production, a hydrogen circulation subsystem and a hydrogen storage subsystem; the ejector is driven by external heat source steam, part of hydrogen at an outlet of the SOE heat box system is ejected to a low-pressure suction inlet of the ejector through the hydrogen circulation subsystem, and formed reducing mixed gas of steam and hydrogen enters a cathode inlet of the SOE heat box system. The system is driven by an external heat source and operates in an internal stack heating mode, so that the power consumption of the electrolytic hydrogen production system is reduced; by adopting the modes of external material supply, cathode ejector material self-circulation and multi-stream heat exchange, a complex cold and hot auxiliary machine of a traditional solid oxide electrolytic hydrogen production system is omitted, the structure is simple, and the system compactness is greatly improved; electric power-steam-air-condensed water flow coupling is established with a coal-fired power plant, and efficient, flexible and deep peak shaving is adjusted in combination with steam extraction multi-stage adjustment.

The invention discloses an SF6 degradation device and method based on gas-liquid two-phase dielectric barrier discharge plasma. The device comprises a gas inlet control module, a dielectric barrier discharge reaction module, an alkaline solution tank and an alkaline solution supply module, the gas inlet control module comprises a gas distributing and mixing unit, an SF6 gas cylinder and an inert gas cylinder, wherein the SF6 gas cylinder and the inert gas cylinder are connected with the gas distributing and mixing unit. The dielectric barrier discharge reaction module comprises a dielectric barrier reactor and a plasma power supply externally connected to the dielectric barrier reactor, and the dielectric barrier reactor is used for exciting inert gas in the mixed gas into plasma by using an electric field and degrading SF6 gas in the mixed gas based on the electric field and the plasma to obtain low-fluorine sulfide. The plasma is utilized to excite the alkaline solution to generate hydroxyl ions, the low-fluorine sulfide is degraded based on the hydroxyl ions, and degraded tail gas is obtained; and the alkaline solution tank is connected with a gas outlet of the dielectric barrier reactor. According to the invention, efficient harmless degradation of SF6 can be realized.

The invention discloses a gas mixing control device for an LPG (Liquefied Petroleum Gas) generator set, which relates to the technical field of generator set operation control, and comprises a gas engine for realizing accurate mixing proportion control under the matching of a proportion dynamic response component, predicting the optimal gas mixing proportion and flow demand under the current working condition, and controlling the gas engine to operate according to the optimal gas mixing proportion and flow demand. When the propane content in the LPG is increased, the model prediction controller properly reduces the gas inflow and increases the air amount, sufficient combustion is ensured, the mixing proportion and flow can be rapidly corrected, the combustion process is rapidly recovered to be stable, it is ensured that the gas engine stably operates under different loads, the whole device forms flow balance and stable operation, and the service life of the gas engine is prolonged. Under different gas sources and LPG component differences, effective components actually participating in combustion are accurately judged, so that the needed gas and air amount is accurately calculated, accurate mixing proportion control is achieved, and meanwhile accurate control over the mixed gas mixing process is achieved under the cooperation of an adjusting control assembly.

The invention discloses a device and a method for producing oxamide, and relates to the field of chemical production. The method for producing oxamide specifically comprises the following steps: mixing a methanol solution of liquid ammonia and a methanol solution of dimethyl oxalate, carrying out ammonolysis reaction, carrying out flash evaporation, filtration and drying on first slurry obtained after the reaction is finished to obtain solid oxamide, and refining a liquid phase obtained by solid-liquid separation of the first slurry to obtain a byproduct methanol, ammonia in the tail gas is washed and absorbed by dimethyl oxalate and then returns to a reaction system. In the oxamide production process, dimethyl oxalate reacts with ammonia gas in mixed gas generated in the reaction process, and the obtained product is continuously subjected to subsequent ammonolysis reaction, so that the utilization rate of reaction materials is increased; meanwhile, a condenser is not used for condensing ammonia gas and methanol and then separating alcohol and ammonia, so that condensing equipment and cooling water are saved, the production cost is reduced, and industrial production is facilitated.

The invention discloses a disilane mixed gas dissolving and mixing system and a control method, and relates to the technical field of gas mixing preparation, the disilane mixed gas dissolving and mixing system comprises seven modules, a storage module realizes accurate pressure control through a honeycomb gas storage tank matrix, and the tank wall adopts a nano composite structure for corrosion prevention; the premixing module forms a chaotic flow field by using a double-helix micro-channel and pulse injection; the reaction module is combined with supercritical and electromagnetic resonance to accelerate the reaction; the monitoring module fuses multispectral detection; the control system is based on deep reinforcement learning, in addition, a gradient condensation-membrane distillation separation module, a bionic safety interlocking module and other modules are further arranged, and all the modules cooperate to achieve efficient mixing and production. According to the device and the method, high-precision preparation of disilane mixed gas, precise pressure-controlled material storage, molecular-level efficient mixed reaction, multispectral precise monitoring, intelligent regulation and control, stability guarantee, high safety interlocking and intelligent maintenance are realized, faults can be reduced, the product quality and the production efficiency are improved, and the cost is reduced.

The invention provides a sensor for detecting local fault decomposition components of C4F7N and a preparation method of the sensor, and belongs to the technical field of gas sensing. The sensor comprises a gas sensitive material, a screening layer material and an interdigital electrode, the surface of the interdigital electrode is covered with the gas sensitive material, and the surface of the gas sensitive material is covered with the screening layer material. According to the invention, SnO2, Pd-SnO2 and MoS2-SnO2 are used as gas-sensitive materials, the surface of an interdigital electrode is covered with the gas-sensitive materials in a dispensing manner, and then the surface of the gas-sensitive materials is covered with a screening layer material Co3 (HITP) 2 in a silk-screen printing manner, so that a double-layer sensing structure is formed. The sensor with the double-layer structure can detect decomposed components C3F6, CO and CHF3 under strong interference of C4F7N background gas, the three gas-sensitive materials respectively have certain response selectivity to the three gases, and the lower detection limits are respectively 0.195 ppm, 3.12 ppm and 3.66 ppm; in addition, the sensing array with the double-layer structure has a certain qualitative and quantitative recognition capability on the mixed gas.

The invention discloses a thermal field coupling dynamically-adjustable ammonia cracker and a control method, the thermal field coupling dynamically-adjustable ammonia cracker comprises an ammonia preheating device and an ammonia cracking reaction device, the ammonia preheating device comprises a combustion preheating chamber and a controllable pure ammonia burner, the combustion preheating chamber comprises a combustion cavity and an ammonia preheating cavity, the ammonia preheating cavity surrounds the periphery of the combustion cavity, and the controllable pure ammonia burner is arranged in the combustion cavity. The controllable pure ammonia burner comprises an ammonia fuel spray head and an air rotational flow assembly, the air rotational flow assembly comprises a plurality of rotational flow fan blades, the distances between the rotational flow fan blades in the circumferential direction are adjustable, the ammonia cracking reaction device comprises a tail gas inlet pipe, a mixed gas heat exchange cavity and an ammonia cracking reaction pipe, and the ammonia cracking reaction pipe is arranged in the mixed gas heat exchange cavity; an inlet of the mixed gas heat exchange cavity is communicated with the tail gas inlet pipe and the combustion cavity at the same time, the ammonia cracking reaction pipe is communicated with the ammonia preheating cavity, and an ammonia cracking catalyst is arranged in the ammonia cracking reaction pipe. The requirements for the high ammonia cracking rate and the high energy utilization efficiency are met, and meanwhile the hydrogen production amount can be dynamically adjusted according to the hydrogen requirement amount of the ammonia internal combustion engine.

The invention discloses a preparation method and a production system of phosphorus trifluoride, and belongs to the technical field of preparation of phosphorus trifluoride. Phosphorus trichloride and first mixed gas are continuously introduced into a reactor, the first mixed gas comprises anhydrous hydrogen fluoride and inert gas, phosphorus trichloride and anhydrous hydrogen fluoride in the first mixed gas are subjected to a double decomposition reaction in the reactor, and intermediate gas containing phosphorus trifluoride is generated. Collecting intermediate gas discharged from the reactor, and rectifying and purifying the intermediate gas to obtain a phosphorus trifluoride product. The inert gas carries anhydrous hydrogen fluoride and phosphorus trichloride to generate double decomposition reaction to generate phosphorus trifluoride, and the inert gas can dilute the concentration of the raw material gas anhydrous hydrogen fluoride participating in the reaction and also can take away heat generated by the reaction, so that the temperature of the reactor is more stable, and continuous production of phosphorus trifluoride is realized.

The invention provides a blast suppression method and system for an underground cavity of a pumped storage power station. The method comprises the following steps: configuring and deploying a multispectral gas sensor array; carrying out gas explosion limit calculation and risk assessment; calculating the risk level of explosion by using the prediction model; performing graded explosion suppression operation by using a graded explosion suppression execution module; combustible gas is guided to enter an inerting area by utilizing a space flow guide optimization module; and the ignition source blocking module is used for cooperative control to block an ignition source. The technical problems of low mixed gas explosion risk prediction and monitoring precision, low explosion suppression efficiency, slow response speed and relatively high operation and maintenance cost are solved.

The invention provides an efficient and stable ship hybrid power generation system which comprises a hydrogen production unit and an ammonia supply system, and the hydrogen production unit comprises an ammonia decomposer, a hydrogen separator, a high-pressure hydrogen storage tank, a fuel cell and an ammonia-hydrogen internal combustion engine. The ammonia decomposer enables the ammonia flow to enter the ammonia decomposer in a segmented constant mode for catalytic decomposition through four set working conditions; the hydrogen separator is used for separating and purifying the generated mixed gas, and the separated and purified hydrogen is respectively fed into the fuel cell and the ammonia-hydrogen internal combustion engine through valves for power generation; the molten salt system recycles high-temperature tail gas of the ammonia-hydrogen internal combustion engine through the heat exchanger for heat energy storage and power generation through the steam Rankine cycle system. The regulation and control method is used for stabilizing the system and prolonging the service life of equipment by limiting the dynamic loading rate and start-stop times of the fuel cell and the ammonia-hydrogen internal combustion engine, and is used for waste heat recovery power generation through the molten salt and the steam expansion machine, so that the efficiency of the system is improved.

The invention discloses an NO and SO2 mixed gas concentration detection method based on deep learning, and the method comprises the steps: obtaining a to-be-detected NO and SO2 mixed gas, inputting the to-be-detected NO and SO2 mixed gas into a trained mixed gas concentration detection model, and obtaining the concentration detection results of the respective single gases of NO and SO2; according to the model, mixed gas spectrum separation and reconstruction are carried out through a separation and reconstruction model based on a bidirectional long-short-term memory network, so that differential absorption spectrums of two single gases NO and SO2, which are output by the separation and reconstruction model, are obtained at one time; and carrying out feature extraction and concentration prediction on the input sequence data through a concentration detection model based on TCN + RNN network so as to obtain concentration detection results of respective single gases of NO and SO2 as outputs. The method provided by the invention can realize spectral separation of the mixed gas and accurate detection of the concentration of NO and SO2, thereby overcoming the problems of cross sensitivity of SO2 and NO and differential optics of incapability of accurately separating SO2 and NO by a traditional treatment method.

The invention discloses a rolling and annealing treatment process for a copper-steel composite strip, and relates to the technical field of material rolling, the process comprises the following steps: selecting a high-purity copper plate and a stainless steel plate, and depositing a nano nickel / graphene composite transition layer through a magnetron sputtering technology; the stainless steel layer is promoted to deform through front-section low-speed high-pressure rolling, and the copper layer interface bonding force is improved through rear-section high-speed low-pressure rolling; performing short-time local annealing by using a high-frequency induction coil; honeycomb-shaped micro-pits are formed in the stainless steel surface through the laser micro-texture technology, and the interface bonding force is improved in combination with the nano-nickel / graphene layer. Copper layer hardening is eliminated through low-temperature annealing, stainless steel recrystallization is promoted through medium-temperature annealing, and a nanometer precipitated phase is fixed through rapid water cooling; the heating rate is controlled, and nitrogen-hydrogen mixed gas is used for preventing oxidation; the rolling process and the annealing process are seamlessly connected, and the temperature, the stress and the atmosphere are detected in real time through an online monitoring system. The mechanical property, the corrosion resistance and the machining stability of the copper-steel composite strip are remarkably improved.

The invention discloses a multi-sensor fused intelligent gas detection method, a terminal and a readable storage medium, the method comprises the following steps: acquiring multi-sensor array signal data, and processing the sensor array signal data to obtain model input data; inputting the model input data into an analysis model, wherein the analysis model extracts signal features of the model input data; and the analysis model identifies the type and concentration of the gas according to the signal characteristics. The spatial information and the time information of the mixed gas sensor dimension are acquired through the sensor array comprising the plurality of sensor units, and then the relationship between the spatial information and the time information and the type and the concentration of the mixed gas is learned by adopting the analysis model, so that the complex space-time characteristics of the mixed gas are considered; therefore, the detection effect on the mixed gas is far better than that in the prior art.

The invention discloses a low-energy-consumption nitrogen-charging grain storage system and method, and relates to the field of nitrogen-charging grain storage. The method comprises the steps that compressed air is sequentially introduced into a filter set, a drying machine and a micro-oil adsorber to be purified and dried; stripping oxygen O2 molecules and water H2O molecules in the air by using a carbon molecular sieve pressure swing adsorption tower to obtain nitrogen N2 molecular gas; inputting nitrogen N2 molecular gas into a cold drying system, and cooling to a preset temperature range; detecting whether the concentration of the output nitrogen N2 molecular gas meets a preset concentration range or not by using an oxygen analyzer; and when the detected N2 molecular gas concentration of the nitrogen is lower than the lower limit of the preset concentration range, starting a circulating pump to suck the mixed gas in the closed warehouse to the carbon molecular sieve pressure swing adsorption tower for adsorption and nitrogen production again until the N2 molecular gas concentration of the output nitrogen meets the preset concentration range. Aiming at the problem that the nitrogen concentration in nitrogen-filled grain storage is difficult to accurately control in the prior art, accurate control of the nitrogen concentration and yield is realized.

The embodiment of the invention provides a method for directly trapping carbon dioxide from air. The method comprises the following steps: capturing carbon dioxide in air through an adsorber; after the carbon dioxide is captured, the interior of the adsorber is vacuumized for the first time; introducing water vapor into the adsorber to increase the pressure in the adsorber and increase the temperature of an adsorbent in the adsorber so as to desorb the carbon dioxide; the adsorber is vacuumized for the second time, and mixed gas formed by water vapor and carbon dioxide is obtained; and carrying out gas-liquid separation on the mixed gas to obtain carbon dioxide. The regeneration energy consumption of the adsorbent is reduced, and the concentration of the carbon dioxide product gas is improved.

The invention relates to the technical field of pulverized coal fired boiler combustors, and particularly discloses a double-high-concentration-area oil-saving ignition pulverized coal combustor. The double-high-concentration-area oil-saving ignition pulverized coal burner comprises a flow guide device and an ignition device arranged in a combustion cylinder. The flow guide device comprises a main cylinder and a turbulent flow structure arranged on the periphery of the main cylinder, the main cylinder is connected to the inner wall of the combustion cylinder through a supporting piece, and the turbulent flow structure is of a structure protruding in the radial direction and used for disturbing the flow direction of mixed gas. Therefore, the problem that in the prior art, when the structural design of an oil-saving ignition pulverized coal burner is in a non-ignition working condition, the pulverized coal concentration distribution mode of'thick inside and thin outside 'is opposite to the design of'thick outside and thin inside' of an original burner of a boiler, and the air powder flow field characteristics of an outlet of the burner and the interior of a hearth are prone to being remarkably influenced is solved.

The invention relates to the technical field of industrial monitoring, in particular to a gas mixture detection model construction method and a gas mixture detection method.The gas mixture detection model construction method comprises the steps that spectral data of a plurality of gas mixtures are obtained; constructing a basic detection model based on a CNN model and a KAN model; and training the basic detection model based on the spectral data to obtain a gas detection model. The invention provides a gas mixture detection method based on a CNN network and a KAN network, which is combined with spectral analysis technologies such as infrared spectroscopy (IR) or Fourier transform infrared spectroscopy (FTIR) and the like, and can improve the recognition speed and precision of complex mixed gas. Through the combination of the technologies, rapid and accurate detection and concentration analysis of various gaseous molecular pollutants in air can be realized, a more reliable air quality control means is provided for the industrial manufacturing process, and the yield and quality stability of products can be improved.

The invention discloses an internal coupling energy-saving atomization ammonia water recovery process for high-concentration ammonia-nitrogen wastewater, and particularly relates to the technical field of wastewater treatment. The process comprises the steps that firstly, ammonia gas and water vapor mixed gas generated after high-concentration ammonia-nitrogen wastewater is rectified through a deamination tower enters the absorption-condensation integrated ammonia recoverer through a pipeline, an internal coupling energy-saving atomization energy-saving device of the integrated ammonia recoverer can generate superfine water mist, and after being combined, ammonia-containing vapor and the superfine water mist are subjected to rapid heat exchange; meanwhile, due to the characteristic that ammonia is extremely easy to dissolve in water, ammonia gas molecules can be combined with liquefied water vapor water molecules, and dissolving heat of the water vapor water molecules can be quickly released to form ammonia water. The method is simple in technological process and small in equipment investment and occupied area, a multi-stage absorption tower and a large amount of absorbent can be saved, the ammonia water is recycled in one step, the ammonia water is high in purity and controllable in concentration, almost no noncondensable gas is generated, and meanwhile steam energy consumption in the high-concentration ammonia-nitrogen wastewater deamination process can be saved.

The invention discloses a mixed gas concentration detection method based on a temperature modulation technology, and relates to the field of semiconductor gas sensing. The problem that the concentration of the mixed gas is difficult to analyze more accurately in the prior art is solved. According to the method, the characteristics of the gas sensitive response data are expanded under the scale of the spatial domain through the temperature modulation technology, the time sequence data are processed by adopting the LSTM neural network model, the characteristic information contained in the sequence data is fully mined, and the recognition precision of the concentration of the mixed gas is remarkably improved through the combination of the temperature modulation technology and the LSTM neural network model. The device and the method are mainly used for detecting the concentration of H2 and CO gas released from the transformer oil in case of failure.

The invention belongs to the technical field of water treatment and wastewater treatment, and provides an ultraviolet-ozone water disinfection device and method for cooling a lamp tube and synchronously generating ozone. The water disinfection device comprises an electrodeless ultraviolet disinfection unit, a synchronous cooling ozone generation unit, an ozone disinfection unit and a control unit, the electrodeless ultraviolet disinfection unit comprises a microwave generator, a waveguide, a microwave resonant cavity and a 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube, and the synchronous cooling ozone generation unit comprises an air blower, an air inlet pipe, an air outlet pipe, a quartz sleeve and oxygen supply equipment. The ozone disinfection unit comprises a microporous aeration disc, and the control unit comprises a control box, a temperature sensor, an electromagnetic valve and an ozone concentration monitor. According to the invention, the dual-wavelength ultraviolet lamp tube is cooled by using large-flow air or air / oxygen mixed gas, and ozone is synchronously and efficiently generated, so that an ultraviolet-ozone combined water disinfection process is constructed, the promotion effect of ozone on water disinfection is fully utilized, the water disinfection effect is enhanced, and the applicability of the method to water bodies with different water qualities is improved.

The present application relates to hydrogen production technology field, especially to a kind of methanol hydrogen production method, comprising the following steps: S10: methanol water is heated and vaporized to obtain methanol water vapor;S20: methanol reforming reaction obtains hydrogen mixture gas;S30: after cooling treatment to hydrogen mixture gas, through water washing tower absorption unreacted methanol water, then, adjust the relative humidity and temperature of hydrogen mixture gas;S40: hydrogen mixture gas is input into carbon dioxide absorption tower to remove carbon dioxide;S50: after removing carbon dioxide, product hydrogen is obtained and input hydrogen tank storage to supply user end.The above-mentioned methanol hydrogen production method, by methanol water vapor reforming hydrogen treatment, obtains hydrogen mixture gas.Again, hydrogen mixture gas is purified to obtain product hydrogen with very low carbon monoxide content, with raw material easy to transport, the hydrogen purity of output is high, equipment construction cost is low, and energy consumption is low and the like advantages, reach the purpose of expanding hydrogen application range.

The invention relates to a gas sensor environment anti-interference drift compensation method, system and equipment, and the method comprises the steps: collecting a mixed gas response signal in an environment, and obtaining an electromagnetic interference signal under the same timestamp; threshold truncation is carried out on spike pulses in the mixed gas response signals to obtain trend waveform signals caused by gas concentration changes, and denoising processing is carried out on the electromagnetic interference signals to obtain effective electromagnetic interference parameters; performing feature recognition on the effective electromagnetic interference parameters through a preset interference-response cooperative processing model to determine an interference mode and an interference intensity grade, synchronously analyzing the trend waveform signal to obtain a response feature curve of the target gas and the interference gas, and obtaining a drift compensation coefficient of the target gas; and carrying out collaborative optimization on the drift compensation coefficient through a preset interaction influence model to obtain a final compensation result so as to achieve the purpose of outputting a high-precision target gas concentration detection result.

The invention discloses a mixed gas-imitating gel fiber as well as a preparation method and application thereof, and belongs to the technical field of fiber materials. The mixed gas-imitating gel fiber is prepared from the following components: cellulose dispersion liquid, a silane coupling agent and viscose in a mass ratio of (1-3): (0.2-0.8): (5-10), comprising the following steps: adding sodium hydroxide into a cellulose dispersion liquid, adjusting the pH value to be alkaline, adding viscose and a silane coupling agent, and carrying out ultrasonic stirring to prepare a mixed spinning solution; the mixed spinning solution is extruded into a coagulating bath through a wet spinning device to be drafted, wet fibers are obtained, and the mixed gas-imitating gel fibers are obtained after freeze drying. The aerogel fiber disclosed by the invention has low heat conductivity coefficient, high mechanical strength and extreme temperature resistance, can solve the problem that the densification and porosity of a traditional fiber structure are difficult to balance, and effectively expands the application prospect of the aerogel fiber in the fields of cold protection, warm keeping and the like.

The invention discloses an intelligent monitoring method, device and system for tunnel construction gas, and the method comprises the steps: collecting multi-source gas data in real time through a mixed gas monitoring network disposed in a tunnel construction environment, the mixed gas monitoring network comprises a fixed gas monitoring node, a mobile gas monitoring node and a personnel wearable monitoring node; based on the multi-source gas data, constructing a three-dimensional gas concentration field dynamic model covering the whole tunnel construction area by using a data fusion and machine learning algorithm; on the basis of the three-dimensional gas concentration field dynamic model, the spatio-temporal evolution trend of the gas concentration in a future preset time period is predicted, at least one control instruction is generated and executed according to the prediction result, and the control instruction comprises an intelligent early warning instruction and / or a ventilation system adjusting instruction. According to the intelligent monitoring method, device and system, traditional post-event alarm is converted into pre-warning and active intervention, the safety of tunnel construction is remarkably improved, and the emergency response speed is remarkably increased.

The invention discloses a multi-mode gas mixing device, relates to the technical field of gas mixing, and solves the problems that when an existing gas mixing cabinet does not have external power for mixing, the mixing efficiency is low, the mixed gas is discharged while the gas is mixed, the condition of non-uniform mixing is easily generated, the working mode is single, and the mixing efficiency is low. The device comprises a bottom plate, a gas mixing cabinet is arranged at the top end of the bottom plate, a control cabinet is arranged on one side of the gas mixing cabinet, and a gas mixing tank and a gas storage tank are arranged in the gas mixing cabinet. Through cooperative work of the structures, gas mixing can be more uniform, the gas mixing speed is increased, the use flexibility of the gas mixing device is improved, the gas mixing device has multiple different working modes, when the pressure of gas in the tank body is too high, the gas can be rapidly discharged from the tank body, and potential safety hazards are avoided.

The invention provides a mixed precursor chemical gas identification method based on feature construction, and relates to the technical field of mixed gas identification, and the method comprises the steps: determining a division criterion of a transient response stage and a steady-state response stage through a working mode of fixed temperature modulation as an inverted step wave; and taking the average value in the steady-state response stage as the characteristic of the structure, establishing a sample library of the structure characteristic and the mixed gas concentration, and fitting the relationship between the structure characteristic and the mixed gas concentration by using a regression model with a simple structure, so that the function of identifying the mixed precursor chemical gas by using the simple model is realized. The current situation that the model for identifying the mixed precursor chemical gas is more complex and the algorithm scale is more huge is changed, and the working efficiency of mixed gas detection is improved.

The invention discloses a C5F10O mixed gas decomposition component adsorption material as well as a preparation method and application thereof. The adsorption material is a metal organic framework / nanofiber composite membrane which is prepared by uniformly dispersing a metal organic framework material on a nanofiber membrane obtained by an electrostatic spinning technology through a spraying doping method and is used for adsorbing decomposition components of C5F10O mixed gas. According to the adsorption material provided by the invention, through mutual cooperation of the metal organic framework material and the porous nanofiber membrane base material, a formed composite membrane has a larger specific surface area and more metal active sites, adsorption of gas molecules is promoted, permeation and diffusion of the gas molecules are also facilitated, and the adsorption efficiency is improved. Therefore, the gas sensitivity and the adsorption effect of the adsorption material are remarkably improved.