128 results about "Gaseous diffusion" patented technology

The invention relates to a gas leakage early warning method and system for a chemical industry park. The early warning method comprises the following steps: acquiring real-time temperature and pressure data of a reaction kettle area and a storage tank area; obtaining a historical leakage record of a pipeline joint, and determining a diffusion path prediction boundary; extracting a wind direction and a wind speed in a diffusion path prediction boundary, and determining space-time distribution characteristics; analyzing space-time distribution characteristics, determining an overlapping region and setting concentration monitoring nodes; identifying the concentration contribution ratio of the reaction kettle area diffusion characteristic and the storage tank area diffusion characteristic; integrating the operation data of the pipeline joint diffusion characteristics and the loading and unloading area diffusion characteristics, and determining a diffusion path deviation correction coefficient; combining the deviation correction coefficient with the humidity data of the peripheral diffusion characteristics of the cooling tower; and updating diffusion parameters of the separation tower area diffusion characteristics and the public engineering area diffusion characteristics according to a source intensity estimation result. According to the invention, accurate prediction and early warning of gas diffusion in a complex chemical device area are realized, and the safety management level is improved.

The invention belongs to the technical field of electrochemistry, and particularly relates to a gas diffusion electrode for efficiently producing hydrogen peroxide in situ and a preparation method thereof. The gas diffusion electrode is composed of a carbon paper substrate, a carbon black gas diffusion layer and a carbon nitride modified carbon nanotube catalyst layer. The preparation method of the gas diffusion cathode comprises the following steps: mixing a carbon nanotube, g-C3N4, isopropanol, 60wt% of PTFE emulsion and water to prepare a mixed solution, and loading a compound of the carbon nanotube and g-C3N4 on one side of a carbon paper substrate by adopting an ultrasonic impregnation mode to prepare a catalyst layer; the other side of the carbon paper substrate is impregnated with carbon black and PTFE emulsion to prepare a diffusion layer, and the diffusion layer is uniformly coated, dried and annealed to prepare the gas diffusion cathode. The gas diffusion electrode is used for efficiently producing hydrogen peroxide through in-situ electrocatalysis, the yield of hydrogen peroxide can reach 1050 mg / L after 1.5 h, the current efficiency is 76%, and the energy consumption is 5.56 KWh / Kg.

The invention belongs to the technical field of oil-gas field development, and particularly relates to a method for testing the content of adsorbed gas in a coal bed gas diffusion process. The problem that the desorption degree of coal bed gas cannot be clearly known at present is solved. According to the technical scheme, high-temperature and high-pressure isothermal adsorption experiments under the condition of different gas proportions are carried out, methane adsorption-desorption capacity of mixed gas of different proportions under different partial pressures is determined, gas diffusion experiments are carried out to evaluate gas migration capacity in the diffusion process and methane gas partial pressure distribution in a sample, and different experiment results are synthesized to determine the methane gas content of the sample. The desorbed gas content in the coal bed gas diffusion process can be calculated; according to the new method, the proportion of the methane desorption gas amount in the coal bed gas development process can be calculated, and the desorption degree of the adsorbed gas of the coal bed reservoir is evaluated.

The invention relates to the technical field of data processing, and provides a mine underground environment monitoring method and system based on sensor data analysis, and the method comprises the steps: arranging sensors at a plurality of underground monitoring points of a mine, and obtaining the gas concentration data of different monitoring points at a plurality of moments; obtaining a gas concentration abnormal factor of each monitoring point at each moment; acquiring gas concentration change correlation; according to the difference and distribution of the gas concentration abnormal factors of different monitoring point positions at the same moment, the size and corresponding time distribution of the gas concentration abnormal factors of each monitoring point position at different moments, and the gas concentration change correlation, the gas concentration abnormal degree of each monitoring point position at each moment is obtained; and monitoring and early warning are carried out on the underground gas concentration of the mine. The invention aims to solve the problem that gas concentration monitored by a single sensor is inaccurate due to gas diffusion in a mine.

The utility model relates to a gas diffusion cascade device for preparing high-abundance nitrogen-15 isotopes by taking nitrogen as a medium. The gas diffusion cascade device comprises a first gas diffusion cascade, a second gas diffusion cascade, a photocatalysis / electro-catalysis device and a high-speed magnetic suspension gas compressor, the first gas diffusion cascade and the second gas diffusion cascade are ladder cascade and respectively comprise a plurality of gas diffusion separation devices; the photocatalysis / electrocatalysis device is positioned between the first gas diffusion cascade and the second gas diffusion cascade; the high-speed magnetic suspension gas compressor is positioned in front of each gas diffusion and separation device in the nitrogen flowing direction; and obtaining the high-abundance nitrogen-15 isotope prepared by taking nitrogen as a medium from the heavy fraction end of the second gas diffusion cascade. The gas diffusion cascade device is high in separation coefficient, large in flow and high in efficiency, the prepared nitrogen-15 isotope abundance is high, and the gas diffusion cascade device is suitable for industrial application.

The invention relates to the technical field of experimental devices for testing diffusion coefficients, in particular to an experimental device for testing the gas diffusion coefficient of a geomembrane and a testing method.The experimental device comprises a gas supply mechanism, a testing mechanism and a stretching mechanism, the testing mechanism comprises a reaction testing cylinder, and the reaction testing cylinder comprises an upper cavity and a lower cavity; one side of the lower cavity communicates with the air supply mechanism, a containing assembly is arranged between the upper cavity and the lower cavity, and the clamping assembly of the stretching mechanism is detachably connected to the middle of the containing assembly. The problem that the gas diffusion coefficient test of the geomembrane under the coupling action of aging and tensile stress cannot be simulated in the prior art is solved, and a reliable experimental device is provided for evaluating the long-term anti-seepage performance of the geomembrane under the actual working condition.

The invention discloses a phosphorane mixed gas filling method, and relates to the technical field of mixed gases, the phosphorane mixed gas filling method comprises instrument pretreatment, step-by-step filling, post-vacuum treatment, quality detection and safety monitoring, and the phosphorane mixed gas filling method has the advantages that a mixed accelerant is added into a filling pipeline in the phosphorane and argon filling process, so that the filling efficiency is improved; by providing a large number of active sites and unique gas diffusion channels, uniform mixing of phosphorane and argon can be accelerated, the uniformity and accuracy of mixed gas matching are improved, in the process of action of an accelerant and gas, argon molecules are fully contacted and collided with dissociated and adsorbed phosphorus atoms under the guidance of a special structure of a nano-porous material, and the phosphorus atoms are separated and adsorbed. The mixed accelerant is added to promote rapid and uniform mixing of the phosphorus and the alkane, stable and accurate-proportion phosphorus and alkane mixed gas is formed, and in the whole process, the mixed accelerant continuously plays a role, so that the uniform mixing efficiency of the mixed gas in the filling process is greatly improved compared with a traditional mode.

The invention discloses a gas leakage source identification system and method based on multiple sensors and a storage medium, and relates to the technical field of probability analysis. Detection data of the sensors in records and effective relative diffusion coefficients of soil are collected; constructing a gas diffusion model when the underground pipeline leaks by using the collected data; the optimal monitoring distance when the underground pipeline is monitored is calculated through the historical leakage opening length, and a monitoring point is made on the underground pipeline within the diffusion area through the optimal monitoring distance; calculating the dangerousness of each region in the diffusion area, determining a high-risk region according to the dangerousness, and placing a gas detection sensor in the high-risk region; aiming at each formulated monitoring point, inputting all data into a gas diffusion model to generate an adjoint equation of each gas detection sensor; the accompanying probability equation of each monitoring point is obtained, the accompanying probability is calculated, and the position of the underground pipeline gas leakage source is searched according to the accompanying probability.

The invention relates to a tunnel toxic gas detection method, device, equipment and system and a storage medium, and belongs to the technical field of information detection.The method comprises the steps that concentration measured values of multiple toxic gases collected by multiple gas sensor nodes in a tunnel are obtained; inputting the concentration measurement values of the various toxic gases into a linear minimum mean square error estimation model, and outputting the position of a gas leakage source and an estimated value of a gas release rate; inputting the estimated value of the gas leakage source parameter into a gas diffusion model, and outputting a gas diffusion parameter; the gas diffusion model is a static smoke plume gas diffusion model based on turbulence diffusion, and the gas diffusion parameters comprise the diffusivity of a gas leakage source; and inputting the estimated value of the gas leakage source parameter, the gas diffusion parameter and the standard-exceeding concentration threshold value of the toxic gas into a finite element prediction model, and outputting a toxic gas standard-exceeding prediction result. According to the invention, continuous monitoring and dynamic early warning of the toxic gas in the tunnel can be realized.

The invention relates to the technical field of chemical gas, in particular to a chlorine leakage detection method and system in reaction kettle production. The method comprises the following steps: acquiring chlorine concentration values and wind field vectors of a plurality of positions around a reaction kettle at each moment; marking any moment as a target moment, and determining the gas diffusion contribution coefficient of each position to other positions at the target moment; determining a real gas diffusion contribution coefficient of each position to other positions at the target moment; determining the airflow correction density of each position at the target moment; and positioning a chlorine leakage source by using a density peak clustering algorithm based on the airflow correction densities of all positions at the target moment. According to the method, the wind field vector is introduced to construct the gas diffusion contribution coefficient to correct the density, the limitation of traditional static diffusion is overcome, the real leakage source and the concentration convergence point in the downwind direction are effectively distinguished, the accuracy and reliability of chlorine leakage source positioning are improved, and support is provided for safe emergency disposal.

The invention provides a combustible and toxic gas monitoring method and system, and the method comprises the steps: dynamically adjusting the density of a sensor based on a historical leakage risk weight, collecting multi-modal environment data, and carrying out the fusion correction, and generating an environment data set; constructing a gas diffusion model based on the environmental data set, predicting future concentration distribution in combination with environmental variables, and identifying a high-risk region; aiming at a high-risk area, an optimization objective function is designed by taking minimization of gas concentration distribution and energy consumption as optimization objectives, an optimal control strategy is generated through the optimization objective function, and temperature, wind speed and ventilation intensity are adjusted to inhibit gas diffusion; and an optimal control strategy is executed and real-time feedback optimization is performed, so that system robustness and energy consumption balance are ensured. According to the invention, the monitoring and control process of gas leakage can be dynamically optimized, more accurate safety management is realized, and the safety and energy efficiency of industrial places are effectively improved.

The invention discloses a solid oxide electrolytic tank for high-temperature electrolysis of carbon dioxide and a preparation method. The electrolytic tank comprises a solid electrolyte substrate, an isolation layer located on one side of the solid electrolyte substrate, a cathode located on the isolation layer and an anode located on the other side of the solid electrolyte substrate. And the material of the solid electrolyte substrate is La < 0.9 > Sr < 0.1 > Ga < 0.8 > Mg < 0.2 > O < 3 > (LSGM). And the material of the isolating layer is Ce < 0.8 > Sm < 0.2 > O < 1.9 > (SDC). The cathode material is a compound composed of Sr2Fe1. 5Mo0. 5O6 (SFM) and Ce0. 8Sm0. 2O1. 9 (SDC), and La0. 8Sr0. 2Cr0. 5Mn0. 5O3 (LSCM) nano particles or CuO nano particles are attached to the cathode material. The anode material is a compound composed of La < 0.7 > Sr < 0.3 > Co < 0.2 > Fe < 0.8 > O < 3 > (LSCF) and Ce < 0.8 > Sm < 0.2 > O < 1.9 > (SDC). The nanoparticles can effectively increase the specific surface area of an electrode, generate additional active sites, provide enough reaction interfaces and gas diffusion channels, effectively promote the reduction reaction of CO2, and contribute to reducing the local carbon concentration and reducing the occurrence rate of carbon deposition.

The invention discloses a multiphase substance filling method for a discarded roadway of a coal face of a spontaneous combustion coal seam. The method comprises the following steps: S1, determining a closed position of the discarded roadway; s2, drilling holes beside the scrapped roadway and laying gas production pipes; s3, an inner side sealing wall is built in the scrapped roadway, and an air injection pipe is arranged; and S4, CO2 gas is injected into the scrapped roadway on the inner side of the inner side sealing wall through a gas injection pipe, and leakproofness detection and other steps are carried out. According to the discarded roadway, sealing and gravel filling are only conducted on the portion, 30 m away from the coal face side, of the discarded roadway through the two sealing walls, CO2 gas is injected into the discarded roadway, after rocks on a top plate of the goaf continuously collapse, the goaf is continuously compacted again, then liquid CO2 is injected into the discarded roadway, and permanent sealing and storage of the goaf can be achieved. And drilling holes are constructed in the periphery of the scrapped roadway, gas in the drilling holes is sampled through the gas production pipe, the diffusion range of CO2 gas in the scrapped roadway is detected, and it is guaranteed that liquid CO2 in the scrapped roadway does not leak.

The utility model belongs to the technical field of methane hydrogen production, and particularly relates to a methane cracking hydrogen production system which comprises a molten metal reactor, the bottom of the molten metal reactor is connected with a methane inlet pipe, and the upper portion of the molten metal reactor is connected with a hydrogen discharge pipe and a carbon flow guide pipe. A buffer area, a reaction area and a hydrogen buffer area are sequentially arranged in the shell from bottom to top, the buffer area is used for conducting gas diffusion on methane to enable the methane to enter the reaction area, the methane is subjected to a high-temperature cracking reaction in the reaction area to generate hydrogen and carbon black, and the hydrogen upwards enters the hydrogen buffer area and is discharged through a hydrogen discharging pipe I; carbon black is deposited upwards at the bottom of the hydrogen buffer area, a carbon scraping device is arranged in the methane cracking system and used for pushing and sweeping the carbon black, and the carbon black enters a carbon collecting and cleaning device through a carbon flow guide pipe.

The invention discloses a method for preparing formate through carbonate electroreduction and application of the formate. The method comprises the following steps: 1) assembling a three-electrode system by using an electrode loaded with a tin-based oxygen-containing compound as a working electrode, an Ag / AgCl electrode or Hg / HgO electrode as a reference electrode, a platinum electrode as a counter electrode and a carbonate solution as an electrolyte, and filling the electrolyte into a gas diffusion electrochemical reaction tank; and 2) introducing oxygen-containing gas into the gas diffusion electrochemical reaction tank, electrifying to sequentially carry out local reduction of the tin-based oxygen-containing compound, electroreduction of carbonate and regeneration of the tin-based oxygen-containing compound, and circulating in sequence. The method for preparing formate through carbonate electroreduction has the advantages of being easy to operate, simple in equipment, reliable in principle, low in cost, high in stability and the like, and is suitable for large-scale industrial application.

The invention discloses a conductive aeration membrane cathode electro-Fenton sewage treatment device and method based on iron circulation and application. The invention belongs to the technical field of electro-Fenton sewage treatment. The invention aims to solve the technical problems of low O2 utilization rate, poor ferrous cyclic regeneration performance and poor selective degradation effect in the current electro-Fenton complex water treatment technology. The nano confinement conductive gas diffusion film is composed of a base film and an active layer, wherein the active layer is composed of fractured CNT and internal BN. An aeration membrane assembly is arranged in the reaction chamber of the device, and the surface, adjacent to the anode, of the assembly is composed of the gas diffusion membrane. By means of the design, oxygen directly makes contact with the catalyst layer through the gas diffusion film and is consumed immediately, and mass transfer resistance generated by water when the oxygen is diffused to the catalyst layer is avoided while 100% utilization of the oxygen is achieved. The nanometer confinement conductive aeration membrane cathode is high in ferrous cyclic regeneration capacity and has a good treatment effect in actual nanofiltration concentrated water, and selective degradation of ECs is achieved.

The invention provides a mine goaf gas monitoring method and device, electronic equipment and a storage medium, and belongs to the technical field of mine monitoring. The method comprises the steps that gas data collected by sensors arranged in different areas of a goaf are acquired, and a gas concentration matrix with time and space correlation is generated based on the gas data; establishing a gas diffusion model based on geologic structure data and ventilation parameters of the goaf, and inputting gas data into the gas diffusion model to calculate a gas concentration prediction matrix of the goaf; determining a target monitoring strategy based on a deviation coefficient matrix of the gas concentration matrix and the gas concentration prediction matrix; and monitoring the goaf based on the target monitoring strategy. According to the mine goaf gas monitoring method and device, the electronic equipment and the storage medium, the accuracy of mine goaf gas monitoring is improved.

Method and system for electrochemically compressing hydrogen. In one embodiment, the system includes a membrane electrode assembly (MEA) that includes a polymer electrolyte membrane (PEM), an anode, and a cathode. First and second gas diffusion media are positioned adjacent the cathode and anode, respectively. A humidifying membrane is positioned next to the second gas diffusion medium on a side opposite the anode. A water supply is connected to the humidifying membrane, and a hydrogen gas supply is connected to the second gas diffusion medium. A hydrogen gas collector including a back pressure regulator is connected to the first gas diffusion medium. Separators, positioned on opposite sides of the MEA, are connected to a power source. In use, hydrogen is electrochemically pumped across the MEA and collected in the hydrogen gas collector. The PEM is kept properly humidified by the humidifying membrane, which releases water into the second gas diffusion medium.

The utility model relates to a gas flow control device. The device mainly comprises a wafer storage device, a gas input device, a gas supply system, a gas inlet element, an input channel, a gas pressure maintaining channel, a first flow equalizing through hole, a first flow equalizing part, first uniform gas, a gas diffusion flow equalizing through hole, a gas diffusion flow equalizing part, diffusion uniform gas, a second flow equalizing through hole and a second flow equalizing part, the gas supply system can provide clean gas to the gas input device, the clean gas sequentially passes through the input channel and the gas pressure maintaining channel to reach the first flow equalizing piece, the first flow equalizing through hole conducts first-stage clean gas dispersion, then the gas diffusion flow equalizing piece conducts diffusion action on the clean gas, and the second flow equalizing through hole conducts diffusion action on the clean gas. And finally, the diffused clean gas is sprayed out in multiple directions through the second flow equalizing through holes, so that the clean gas in the wafer storage device is ventilated, and the clean gas can be uniformly spread to each place.

The application discloses a kind of based on heat trigger solid-liquid reaction's goaf spontaneous combustion initiative inerting device and method, belong to coal mine fire prevention technical field, first based on experimental data, goaf beam tube monitoring and numerical simulation determine goaf high temperature prevention area, under the influence of setting safety margin and considering the maximum thickness of residual coal determine the starting temperature of adaptive inerting device, then according to goaf residual coal thickness, porosity, oxygen concentration field and high temperature prevention area area calculate out initiative inerting device size and reagent filling amount, finally combine the effective coverage area of single device and honeycomb grid generation algorithm, design initiative inerting device dynamic pre-buried point, and pre-bury initiative inerting device in coal mining face, when device reaches the high temperature protection area of goaf deep, temperature sensing guide column paraffin melt, aluminum sulfate solution in liquid reagent storage tank flows into solid reaction bin and sodium bicarbonate reaction along guide column, generate a large amount of CO2 from exhaust port, rapidly reduce local oxygen concentration, eliminate goaf spontaneous combustion hazard.The core innovation of the application is to abandon the traditional passive prevention mode relying on gas diffusion, and instead adopt the initiative control mechanism of "temperature sensing trigger-in-situ reaction-directional release", so that CO2 directly acts on the high temperature area through the directional exhaust port, rapidly reduces the local oxygen concentration, cuts off the necessary condition of coal spontaneous combustion from the source, realizes the initiative identification and accurate inerting of goaf high temperature area, and ensures the safety production of coal mining face.

The application relates to a gas detection device and a gas concentration detection method. The gas detection device comprises a micro-detection chamber, a power source, an air outlet, a gas diffusion resistance element, and a working electrode. The volume of the micro-detection chamber is fixed, and the micro-detection chamber is provided with an air inlet. The power source is connected with the micro-detection chamber. The air outlet is connected with the power source. The gas diffusion resistance element is arranged in the micro-detection chamber. The working electrode is connected with the gas diffusion resistance element, and the working electrode is provided with a catalytic material. The working electrode is used for detecting a response value of a to-be-detected gas concentration and / or consuming the to-be-detected gas. The gas detection device has a small volume and a simple structural design. When the gas concentration is detected, a small amount of gas is required. According to specific experimental requirements, the gas detection device with different structural features can be used for measuring a single gas concentration or a mixed gas concentration.

The invention relates to a high-purity reactor for regenerating low-concentration bicarbonate and application of the high-purity reactor. The reactor comprises a cathode end plate, a gas diffusion cathode, a cation exchange membrane, an intermediate plate, a proton exchange membrane, an anode and an anode end plate which are sequentially arranged, the middle plate is provided with a middle cavity, a third feeding port and a third discharging port, and a solid electrolyte layer is arranged in the middle cavity; the cathode end plate is provided with a first feed port, a first discharge port and a groove-shaped first runner, and the anode end plate is provided with a second feed port, a second discharge port and a groove-shaped second runner; the reactor utilizes low-concentration bicarbonate to regenerate high purity on the basis of an electrochemical principle, the utilization rate of resources such as oceans / lakes is increased, the regeneration purity is 99%, industrial-grade current density can be achieved, the stability of the reactor is high, and the reactor has industrial application potential and wide application prospects.

This application relates to the technical field of dust removal, and in particular to a multi-stage dust removal device and method for coal mine roadways with impact resistance. The device includes an upward-opening water tank with an outlet on the side. A rotating shaft is rotatably mounted on the bottom of the water tank via a bearing. A cavity for air passage is formed inside the rotating shaft. A pushing mechanism is installed on the part of the rotating shaft located inside the water tank, and a pre-treatment mechanism that cooperates with the cavity is installed on the top of the rotating shaft. The pushing disc and the fan-shaped plate cooperate to push impurities floating on the water surface upward, which can effectively remove floating impurities on the water surface and prevent them from forming a barrier film on the water surface. This creates an unobstructed channel for gas diffusion. That is, when the water surface is kept clean and unobstructed, the gas can escape from the water surface more smoothly, the separation efficiency of impurities and gas is significantly improved, and thus the dust removal effect of the gas is greatly improved.

The invention relates to a device and a method for detecting an oil-soluble gas diffusion process under a partial discharge condition, and the device comprises a high-voltage generator which provides a high-voltage condition for the oil-soluble gas diffusion under the partial discharge condition; the test box is used for simulating a partial discharge process according to the high-voltage condition output by the high-voltage generator, providing a detection signal and generating partial discharge quantity and diffusion gas under the partial discharge condition; the partial discharge gas analyzer is used for detecting the gas concentration of diffusion gas in the test box and obtaining a gas diffusion coefficient generated by partial discharge; and the data analysis system is used for processing the detection data obtained from the partial discharge gas analyzer and the oscilloscope, establishing the relationship between the diffusion coefficient of the oil-soluble gas and the partial discharge amount under the partial discharge condition, and representing the partial discharge process by using the diffusion coefficient of the oil-soluble gas. Compared with the prior art, the method has the advantages of judging the partial discharge degree, improving the detection sensitivity and the like.

The invention discloses a goaf spontaneous combustion active inerting device and method based on thermal trigger type solid-liquid reaction, and belongs to the technical field of coal mine fire prevention and extinguishing. The method comprises the following steps: determining the starting temperature of an adaptive active inerting device under the conditions of setting a safety margin and considering the influence of the maximum thickness of residual coal, and then calculating the size of the active inerting device and the reagent filling amount according to the thickness of residual coal in a goaf, the porosity, an oxygen concentration field and the area of a high-temperature control region; finally, combining the effective coverage area of a single device and a honeycomb grid generation algorithm, designing a dynamic pre-embedded point location of the active inerting device, pre-embedding the active inerting device on a coal face, and when the device reaches a high-temperature protection area in the deep part of a goaf, melting paraffin in the temperature-sensing flow guide column when the device is heated, so that the temperature-sensing flow guide column reaches the high-temperature protection area in the deep part of the goaf. An aluminum sulfate solution in the liquid reagent storage tank flows into the solid reaction bin along the flow guide column to react with sodium bicarbonate, a large amount of CO2 is generated and discharged from the exhaust port, the local oxygen concentration is rapidly reduced, and the natural ignition hidden danger of the goaf is eliminated. The core innovation of the invention lies in that a traditional passive prevention and control mode depending on gas diffusion is abandoned, and an active prevention and control mechanism of'temperature sensing trigger-in-situ reaction-directional release 'is adopted, so that CO2 directly acts on a high-temperature area through a directional exhaust port, the local oxygen concentration is quickly reduced, the necessary condition of coal spontaneous combustion is cut off from the source, and the coal spontaneous combustion is realized. Active recognition and precise inerting of the high-temperature area of the goaf are achieved, and safe production of a coal mining working face is guaranteed.

The invention belongs to the technical field of shale reservoir development experiments, and discloses diffusion coefficient testing equipment and a diffusion coefficient testing method.The diffusion coefficient testing equipment comprises a sample holder, a gas injection system, an experimental oil injection system, a confining pressure adjusting device and an oil-gas separation metering system. The sample holder is provided with an air cavity, a sample cavity and an oil cavity which are communicated in sequence; the gas injection system is selectively communicated with the gas cavity, fills experimental gas into the gas cavity and adjusts the pressure of the gas cavity; the experimental oil injection system is selectively communicated with the oil cavity, injects experimental oil into the oil cavity and adjusts the pressure of the oil cavity; the confining pressure adjusting device is communicated with the sample cavity and can adjust the pressure in the sample cavity; and the oil-gas separation metering system is selectively communicated with the oil cavity, is used for containing experimental oil containing experimental gas after an experiment and can be used for carrying out oil-gas separation on the experimental oil. According to the diffusion coefficient testing equipment, the determination accuracy of the gas diffusion coefficient in the porous medium can be improved, and the influence of the diffusion effect in the shale reservoir on the improvement of the recovery efficiency can be accurately described.

The invention belongs to the technical field of metal powder preparation, and particularly relates to a method for preparing metal powder through intermittent gas supply reduction. The method comprises the following steps: in a metal oxide heating stage, continuously introducing a reducing gas; and when the temperature is raised to the reduction reaction temperature of the metal oxide, intermittently introducing reducing gas until the reduction reaction is finished. By means of intermittent gas supply, reduction reaction by-products can be discharged in time, the gas environment of a reduction reaction interface is updated, the problems that in traditional continuous gas supply, by-products are accumulated, and the gas diffusion efficiency is low are solved, efficient and uniform reduction of a thick material layer (larger than or equal to 50 mm) can be achieved, and the prepared metal powder is high in uniformity.

A gas sensing device is manufactured with three dimensionally connected metal oxide foam structure of large surface area and elongated channel pores within the three-dimensional porous structure for gas sensing applications, thereby increasing the surface area of the sensing layer and expediting sensitivity and sensor response. A gas sensor device includes the fabricated metal-oxide-foam sensing material attached via silver paste to platinum electrodes and ruthenium heater that are printed on low temperature co-fired ceramic substrate. This device will provide improved gas sensing performance with improved sensitivity and response time. Gas sensors including the metal oxide foam sensing material exhibit higher sensitivity to toxic gases such as ethanol and carbon monoxide due to the large surface area achieved from the porous three-dimensional structure providing increased chemical reaction sites and the larger porous channels allowing gases to easily pass, shortening the gas diffusion reaction path.

The invention discloses a CuO / In2O3 two-dimensional porous nanosheet gas sensitive material, a gas sensitive element and application of the gas sensitive element. A mixture of deionized water, ethanol and ethylene glycol is used as a solvent, indium nitrate is used as a precursor, and two-dimensional porous flaky indium oxide is obtained through hydrothermal and calcination treatment. Then, indium oxide is used as a matrix, copper oxide nanoparticles are compounded on the surface, and the CuO / In2O3 composite gas-sensitive material is obtained. The composite gas-sensitive material is a two-dimensional porous sheet, the two-dimensional porous sheet has a large effective surface area, the porous structure provides a rapid and continuous charge transfer channel and a gas diffusion channel, and CuO provides an alkaline site for adsorption of acidic H2S gas, so that the gas-sensitive material can be used as a gas-sensitive material for adsorption of acidic H2S gas. The CuO / In2O3 gas sensor has the advantages of high sensitivity, high selectivity, fast response and low detection limit on H2S gas at room temperature. The CuO / In2O3 composite gas-sensitive material prepared by the invention has a wide application prospect in the aspect of H2S gas detection, and the CuO / In2O3 composite gas-sensitive material is simple in synthesis process, short in synthesis time, low in cost and suitable for mass production.

The present application relates to the technical field of chemical gas, and particularly relates to a method and system for detecting chlorine leakage in the production of a reaction kettle. The method comprises: obtaining chlorine concentration values and wind field vectors of multiple positions around the reaction kettle at each time; taking any time as a target time, determining a gas diffusion contribution coefficient of each position to the remaining positions at the target time; determining a real gas diffusion contribution coefficient of each position to the remaining positions at the target time; determining a gas flow correction density of each position at the target time; and based on the gas flow correction densities of all positions at the target time, locating a chlorine leakage source by using a density peak value clustering algorithm. The present application corrects the density by introducing the wind field vector to construct the gas diffusion contribution coefficient, overcomes the limitations of the traditional static diffusion, effectively distinguishes the real leakage source and the concentration collection point downwind, improves the accuracy and reliability of the chlorine leakage source positioning, and provides support for safety emergency disposal.