96 results about "Ultrafine particle" patented technology

The invention relates to the technical field of filtering devices, in particular to an ultrafine particle filtering device with an automatic deslagging function, which comprises a filtering tank and an internal conical filtering cylinder, the upper end of the filtering cylinder is connected with a liquid inlet pipe, the lower end of the filtering cylinder is communicated with a deslagging pipe, a rotating rod is arranged in the filtering cylinder, and a flow guide wheel is fixed at the top of the rotating rod; when liquid flows in, the flow guide wheel is driven to rotate, the rotating rod is driven to rotate, a first reciprocating spiral guide groove is formed in the outer wall of the rotating rod, and the flow pushing plate moves up and down along the guide groove to push the liquid to turn over, accelerate liquid drainage and avoid particle deposition. An eccentric wheel periodically pushes the lower end of the filter cartridge under the action of a limiting spring seat, a ball head and a limiting plate, so that the filter cartridge generates self-adaptive shaking, filter hole blockage is reduced, the lower end of a rotating rod drives an ejector rod to eject an overturning plate through a second reciprocating spiral guide groove, and deposited impurities are automatically discharged through a slag discharging pipe. According to the device, coordinated actions of plug flow disturbance, shaking and automatic deslagging can be realized by utilizing liquid flow, the filtering efficiency is remarkably improved, and manual cleaning is reduced.

Tantalum powder, comprising pure tantalum powder or tantalum alloy powder, wherein the particle size distribution of the tantalum powder has the following characteristics: (1) Dv90 < 5 μm; and (2) Dv10 > 0.5 μm. The tantalum powder has a narrow particle size distribution and does not contain nanoscale ultrafine particles, and has high stability and a high utilization rate. The present invention further relates to a method for preparing tantalum powder.

The invention discloses high-purity oxamide with concentrated particle size and spherical morphology, a preparation method of the high-purity oxamide and application of the high-purity oxamide in preparation of a slow-release fertilizer, and belongs to the technical field of oxamide synthesis and application. The method comprises the following steps: mixing an ammonia-alcohol solution and an alcohol ester solution, conveying the mixed solution into a series tubular reactor for reaction, and then conveying the mixed solution into a parallel tubular reactor for reaction after pressure stabilization and flow equalization to obtain a reaction solution containing oxamide; performing flash evaporation on the reaction liquid to obtain flash evaporation liquid and flash evaporation gas, and performing solid-liquid separation on the flash evaporation liquid to obtain solid oxamide and filtrate; and drying the solid oxamide to obtain the oxamide. The method realizes high conversion rate and high purity, and the product has ultrafine particle size distribution. The purity of the prepared oxamide is greater than or equal to 99%, the D50 particle size is concentrated to 50 + / -15 microns, the spherical morphology is uniform, the release is stable, and the oxamide has a very good effect in preparation of long-acting slow-release fertilizers and combustion inhibitors and research on the nitrogen utilization rate.

The invention relates to the technical field of cutting fluid separation and filtration, and discloses mist separation and filtration equipment for cutting fluid for photovoltaic silicon wafer production, which comprises a rack, a centrifugal tank body, a feeding shaft, a servo motor and a filter cartridge, a locking sleeve is installed on the feeding shaft, a plurality of fixed sleeves are fixedly installed on the locking sleeve, a sliding shaft body in sliding connection with the inner wall of each fixed sleeve is installed in the corresponding fixed sleeve, an annular disc frame is fixedly installed on each sliding shaft body, and a plurality of intercepting components are arranged between the annular disc frames and the fixed sleeves; according to the mist separating and filtering equipment for the cutting fluid for photovoltaic silicon wafer production, flow field parameters can be effectively changed by dynamically adjusting the radius of the intercepting part, optimization treatment on oil mist with different concentrations is achieved, the particle residence time can be prolonged through the intercepting part, and therefore collision polymerization between superfine particles and large particles is facilitated; therefore, the large particles can carry the superfine particles to be in contact with the filter cartridge, and are separated and filtered under the action of the filter cartridge.

The invention discloses a sponge city seepage and drainage structure and a sponge city water circulation system, and relates to the technical field of sponge city construction. A capillary air flotation grading pretreatment unit, a rhizosphere electro-catalysis layer and a mineral conversion filler layer are sequentially arranged below the permeable pavement layer in the rainwater permeation direction, and the drainage layer is a piezoelectric drainage layer; according to the method, blockages are subjected to capillary air flotation classification, minerals are converted into purification carriers, solid waste outward transportation is avoided, and heavy metal pollution is prevented; the water circulation end depends on photovoltaics, an external power grid is not needed, and carbon is reduced; sensor linkage adapts to a purification mode of high / low-pollution rainwater, and a straw self-cleaning function at the seepage and drainage end is prevented from being interrupted; the magnetic sensitive medium is prepared by converting blockages, outsourcing is avoided, and the cost is reduced; the ultrafine particles in the by-products assist in purification, the uleucite is used for preparing the pervious concrete, and the zeolite is used for improving the soil, so that environmental protection and resource regeneration are realized.

The invention relates to the technical field of air purification, and discloses a space air particle differentiation system and a control method thereof.The space air particle differentiation system comprises an air particle separation module and a control module, the air particle separation module comprises an air inlet, a cyclone separation barrel and a detachable dust collection barrel, the cyclone separation barrel separates particles in air through centrifugal force classification, and the separated particles fall into the bottom dust collection barrel; the ultraviolet catalysis module comprises an ultraviolet reaction chamber, the inner wall of the ultraviolet reaction chamber is coated with a photocatalyst, and a UV-C light source is configured and used for decomposing organic pollutants and microorganisms; the electron-ozone reaction module comprises a mixed flow pipeline fan and an exhaust port, the mixed flow pipeline fan forms negative pressure airflow in the system, and purified air is exhausted through the exhaust port. Through cooperation of cyclone separation, ultraviolet catalysis and electron-ozone reaction, large particles are removed through cyclone separation, organic matter is decomposed through ultraviolet catalysis, microorganisms and superfine particles are oxidized and decomposed in a reaction chamber through electron flow and ozone, the maintenance period is prolonged, and efficient consumable-free purification is achieved.

Method and apparatus to enable detection, count, and recordation of properties of particles of ultrafine particle sizes (<0.1 micron) as well as particle of larger sizes with the use of a condensation nuclei counter configured to enable multiple stages of volume expansion with the use of an array of fluidly connectable chambers.

The invention discloses a silicon wafer ultrafine particle cleaning optimization method, and particularly relates to the field of semiconductor cleaning processing, and the method comprises the following steps: S1, optimizing a cleaning process; s2, improving equipment and an operation mode; and S3, improving environmental conditions. According to the silicon wafer superfine particle cleaning optimization method, through the synergistic effect of optimizing the cleaning process, improving the equipment and the operation mode, improving the environmental condition and the like, the cleaning capacity of small particles smaller than 0.16 micron on the surface of the silicon wafer can be effectively improved, the silicon wafer cleaning effect and quality are improved, and the silicon wafer cleaning quality is improved. The high-precision requirement of the semiconductor manufacturing process is met, the product cleaning capacity is precisely improved by adopting proper cleaning liquid and proportion and controlling the cleaning time and temperature, and the expected high standard specification is achieved by using advanced cleaning equipment and optimizing and standardizing the operation process. A high-standard production environment is achieved by improving environmental conditions and combining with parameters such as the environment control temperature, humidity and pressure of a clean room.

The invention relates to an ultrafine particulate matter cell exposure observation system and method for simulating human respiration based on planar waveguide dark field microscopic imaging. The system comprises a particulate matter generation module, a humidity regulation and control module, a cell exposure module, a dark field microscopic imaging module and a data acquisition and processing module. The method comprises the steps of particulate matter generation, humidity adjustment, cell exposure, dark field microscopic imaging, acquisition, data recording and the like. According to the invention, high-efficiency imaging and quantitative observation of cells on specific humidity and particulate matter exposure response can be realized in a simulated human respiration environment. According to the invention, high-stability and low-interference particulate matter exposure is carried out on cells in a simulated human respiration environment, high-contrast dark field imaging and image recording are synchronously completed, and the system has the remarkable advantages of high integration level, high stability, excellent imaging quality and the like.

The application discloses a system for preventing agglomeration of superfine powder, which comprises a charge chamber arranged in a gas-phase dynamic mill, a first ion generator for conveying first ions into the charge chamber to form an electric environment of the first ions in the charge chamber, and a second ion generator for conveying second ions with opposite electric properties to the first ions into a falling area through which the large particles fall. When the powder passes through the charge chamber, the powder particles carry the first ions and have the same electric properties, so that the agglomeration of the powder particles can be avoided according to the principle of repulsion between same properties. The first ions on the falling large particles are neutralized by the second ions, so that the large particles become uncharged particles and directly fall into a supersonic airflow input area for further crushing. The system can prevent the superfine particles from being too close to each other to generate force and adsorption force by using the repulsive force of the same electric charges, so that the dispersion degree of the superfine particles is improved and the agglomeration of the superfine particles is prevented.

The invention relates to the technical field of dust removers, in particular to a gas distribution device for removing superfine particles based on wet electric precipitation. Comprising a support, a dust remover shell and a purifier communicated with the top of the dust remover shell, a dust collection hopper is arranged at the bottom of the support and communicated with a dust and gas inlet and a discharging pipe, a plurality of dust collection plates and discharging polar plates which are alternately arranged are arranged on the support in a horizontal transverse array mode, and a circulating liquid supply device is arranged on the top of the support. The circulating liquid supply device is used for forming a continuous water film from top to bottom on the surface of the bracket so as to wash the captured particulate matters. The flow limiting plate is promoted to reciprocate through periodic rotation of the cam, so that the size of the cross section of the water film channel is changed, dust attached to the dust collecting plate is scoured in a pulse mode, attachment of particles to the dust collecting plate is reduced, and the purification effect on the particles is improved.

This invention discloses an ultrafine particle soil fluidized solidifier and an intelligent pile-forming process for in-situ pre-mixed fluidized solidified soil. The solidifier comprises cement, granulated blast furnace slag powder, and other main solidifying materials, along with an organic polymeric dispersant. Through the action of a low dosage of the organic polymeric dispersant, the plastic-to-fluid transition of the cohesive solidified soil is achieved, solving the technological challenges in preparing ultrafine particle fluidized solidified materials with high dosage, low moisture content, and high strength. An innovative airtight construction process is proposed. By introducing a pressurized airflow during mixing, the gas phase space of the ultrafine particle fluidized solidified material is increased, providing space for the growth of hydration product crystals and suppressing the strength-reducing effect of the organic polymeric dispersant on the solidified soil. This achieves rapid mixing of the solidifying material and the solidified soil, significantly improving the construction efficiency of in-situ soil solidification.

The invention relates to the technical field of intelligent fire fighting, and discloses an intelligent fire fighting platform multi-equipment information fusion early warning method and system, and the method comprises the steps: continuously collecting the data of detection equipment in a clean room of a semiconductor manufacturing factory, and presetting and storing an abnormal signal sequence template containing ultrafine particles, chemical activity monitoring and traditional fire features; and early recognition of the atypical dangerous events is realized. According to the method, a real-time detection equipment data sequence is compared with an abnormal signal sequence template, the matching degree is obtained, and when the matching degree reaches a preset threshold value, it is judged that an atypical dangerous event exists, and early warning information is generated. According to the invention, the identification capability and the early warning timeliness of the intelligent fire-fighting platform on atypical dangerous events in high-risk environments such as semiconductor manufacturing factories can be obviously improved, and the equipment safety and the personnel health are effectively guaranteed.

This invention discloses a system and method for treating ultrafine particulate matter and sticky dust in waste incineration flue gas, relating to the field of flue gas purification. In the first treatment zone, the surface charge of the particulate matter in the flue gas approaches the isoelectric point. When the flue gas enters the second treatment zone, the particulate matter undergoes a bridging and agglomeration reaction, increasing the particle size. When the flue gas enters the third treatment zone, the surface of the particulate matter undergoes chemical hydrophobic modification, increasing the hydrophobic angle of the particle surface. This invention, through the first, second, and third treatment zones, agglomerates submicron-sized ultrafine particulate matter that is difficult to capture into micron-sized large particles that are easy to capture, improving dust removal efficiency and solving the problem of low capture efficiency of ultrafine particulate matter in traditional bag filters.

The invention belongs to the technical field of radiochemistry, and particularly relates to a nanofiber filter membrane as well as a preparation method and application thereof. The electrostatic spinning technology is adopted, and the nanofiber filter membrane which is uniform in structure, fine in fiber and free of defects is prepared. By regulating and controlling spinning conditions, optimal fiber diameter distribution is obtained, no spindle exists, and the mechanical property of the filter membrane is improved while the trapping efficiency of the filter membrane on ultrafine particles is improved. The obtained nanofiber filter membrane can keep mechanical stability and low resistance while capturing superfine radioactive particles, the average diameter and the pore diameter of nanofibers are extremely small, the nanofiber filter membrane has a larger comparison area and a porous structure, a large number of contact sites can be provided, and especially the nanofiber filter membrane has excellent capturing efficiency on superfine particles smaller than 100 nm.

The invention belongs to the technical field of metallurgy, and particularly relates to superfine particle tungsten carbide powder and a preparation method and application thereof.The preparation method comprises the following steps that S1, carbon paste, hydrochloric acid and an ammonium tungstate solution are obtained, the carbon paste and the hydrochloric acid are subjected to first ultrasonic stirring, and a first mixed solution is obtained, performing second ultrasonic stirring on the ammonium tungstate solution and the first mixed solution to obtain a second mixed solution, washing the second mixed solution with pure water, and drying to obtain a tungstic acid and carbon precursor mixture; s2, calcining the tungstic acid and carbon precursor mixture to obtain a tungsten oxide and carbon mixture; s3, the tungsten oxide and carbon mixture is subjected to first carbonization, crushing and sieving, and first tungsten carbide powder is obtained; and S4, the first tungsten carbide powder is subjected to carbon blending to obtain second tungsten carbide powder, and the second tungsten carbide powder is subjected to second carbonization, crushing and sieving to obtain the ultrafine particle tungsten carbide powder. According to the preparation method, the ultrafine particle tungsten carbide powder with the specific surface area of 2.0-3.0 m < 2 > / g, the combined carbon content of 6.10-6.11 wt% and the free carbon content of 0.03-0.04 wt% is prepared by adopting carbon thermal reduction and step-by-step carbonization.

The invention provides an epoxy adhesive nano-emulsion as well as a preparation method and application thereof. The epoxy adhesive nano-emulsion comprises the following components in parts by mass: 30-50 parts of epoxy resin, 10-20 parts of a water-based curing agent, 2-8 parts of a nanoscale emulsifier, 5-15 parts of modified nano-filler, 1-5 parts of an auxiliary agent and 20-40 parts of deionized water. The average particle size of the epoxy adhesive nano emulsion is 50 to 200 nm. According to the epoxy adhesive nano-emulsion disclosed by the invention, the epoxy resin is emulsified to a superfine particle size of 50-200nm through a nano-scale emulsification technology, so that the infiltration capacity of the emulsion in an underwater environment and the wettability of the emulsion to a wet concrete base material are remarkably enhanced, and a foundation is laid for realizing deep repair and reinforcement; a continuous three-dimensional network structure is constructed on the nanoscale by introducing the nano filler subjected to surface modification by a silane coupling agent, so that the interface bonding strength between a cured repair layer and a concrete matrix is remarkably improved.

The invention discloses steel slag sand fine grain tailing composite filling mortar and a preparation and use method thereof, and belongs to the technical field of tailing cemented filling materials. Raw materials of the mortar comprise fine grain tailings, steel slag sand, a magnetic volcanic ash binding material, a gel breaker and an ultrafine particle capturing agent, the magnetic volcanic ash binding material comprises magnetic powder particles, the residual magnetic induction intensity of the magnetic powder particles is 0.15-2.5 mT, and the mass of the magnetic powder particles accounts for 5-10% of the total mass of the magnetic volcanic ash binding material. By adopting the magnetic volcanic ash cementing material, other particles can be driven to approach to steel slag sand together to form an aggregate by utilizing the magnetic aggregation and magnetic effects of the magnetic volcanic ash cementing material and fine weakly magnetic particles in the tailings, so that the situation that the strength distribution of a consolidation body is not uniform due to different gravity settling velocities of fine sand and the fine tailings is avoided; therefore, the strength of the filling body can be remarkably improved, and meanwhile the using amount and filling cost of the cementing material are reduced.

The invention relates to a preparation method of sphere-like superfine boehmite, and belongs to the technical field of materials. According to the method, accurate control over the morphology and the particle size of boehmite is achieved through the two-step hydrothermal reaction of'first acid and second alkali ', the first hydrothermal reaction controls oriented growth of boehmite under induction of boehmite seed crystals, and a spheroidic boehmite prototype is formed; in the second hydrothermal reaction, the boehmite precursor obtained by the first hydrothermal reaction is deeply modified in an alkaline environment, and the boehmite is regularized into a sphere-like shape. The boehmite prepared by the method has high purity, ultrafine particle size and regular sphere-like morphology, and is especially suitable for being used as a coating material and a high-end precision polishing material of a high-end lithium battery ultrathin diaphragm.

An objective of the present invention is to provide a pipe through which fluids can flow, in which thermal insulation in a space between an inner wall and an outer wall is achieved at low cost and high performance. The thermal insulation pipe of the present invention is a thermal insulation pipe formed by a double wall pipe of an inner pipe and an outer pipe. A thermal-insulating material to be filled in a space between the inner pipe and the outer pipe is made from an aerogel having a three-dimensional network structure with a framework constituted by a cluster of aggregation of primary particles. The thermal-insulating material includes fine particles having a three-dimensional network structure with a framework of the primary particles. A preferred form of such a thermal-insulating material is weakly bonded aerogel ultrafine particle generated by crushing at ultra-high speed a low-binding ultrafine aerogel generated from an aerogel with aging conditions during manufacturing process set to a low temperature and short time period.

The invention provides superfine particle powder and fiber reinforced composite foam concrete and a preparation method thereof, and belongs to the field of special engineering structure protection materials. The foam concrete is prepared from the following raw materials in parts by weight: 220 to 320 parts of ultrafine particle composite powder, 0.5 to 7 parts of fiber reinforcement, 0.5 to 1.5 parts of high-performance water-reducing mother liquid, 1 to 2 parts of calcium sulphoaluminate, 80 to 120 parts of water and a plurality of foams, wherein the plurality of foams depend on the designed volume weight of the foam concrete. The high-performance fiber foam concrete with the apparent density of 849 kg / m < 3 > prepared by the invention has the 28d compressive strength of 13.68 MPa and the energy absorption value of 3.21 MJ / m < 3 >, has the characteristics of light weight, high strength, crack resistance and excellent energy absorption, and can show wide application prospects in the engineering fields of shock resistance, shock absorption, impact protection, energy dissipation and the like.

The invention discloses a novel aerosol particle size spectrometer measurement method, and relates to the technical field of optical measurement, and the method comprises the steps: applying a gradient electric field to an electrostatic focusing lens array to precisely constrain 1-100 nm ultrafine particles, and carrying out the resonance arrangement of 0.5-100 [mu] m micron-sized particles through an integrated piezoelectric resonant cavity by using surface acoustic waves; the nanoscale channel adopts a miniaturized differential electromigration analyzer and pulse high voltage to realize subsecond-level particle grading, and the optical channel enhances the scattered signal capturing capability through an ellipsoidal reflector and a dual-wavelength laser system; a processor based on the FPGA dynamically monitors particle flux, an optical channel is intelligently closed to avoid high-concentration interference, and the stability of extreme working conditions is guaranteed; a convolutional neural network algorithm fuses an electron microscope calibration image and an in-situ measurement signal, a moisture absorption growth physical model is embedded, and dry particle size distribution is accurately inverted in a complex humidity environment. The problems of scale coverage blind areas, humidity sensitive errors and mixed state misjudgment in aerosol measurement are solved.

A negative ionization cell for negatively ionizing fine, ultrafine or nanoparticles present in an air flow defined by fumes, vehicle exhaust gases or indoor environments is disclosed. The cell has a body defining an ionizing part having first and second portions which are elongated, preferably plate-like, and facing each other. The first portion has a negative voltage to generate a potential difference with the second portion. The first and second portions also define a passage for the air flow and the first portion supports a plurality of elongated and sharp-pointed bodies projecting into the passage for the air flow and orthogonally to the air flow. The elongated and sharp-pointed bodies generate an electron flow, directed toward the second portion due to the potential difference and intercept the solid particles in the air flow to negatively charge them. An air purifier including the negative ionization cell is also disclosed.

The application provides a chlorantraniliprole-containing ultrafine particle size water-based nano-suspension agent and a preparation method and application thereof. 90 The particle size D of the chlorantraniliprole-containing ultrafine particle size nano-suspension agent is ≤100nm, no wetting agent, defoaming agent and stabilizer is added in the formula, and the nano-suspension agent has the characteristics of high grinding efficiency, high suspension rate, low viscosity, good pouring property and excellent stability. The nano-suspension agent does not rely on a high molecular stabilizer to realize suspension stability, but relies on Brownian motion of a nano system to realize kinetic stability, and is a nano pesticide preparation based on kinetic stability principle.

The centrifugal machine dehydration system comprises two stages of centrifugal machines, the centrifugal machines are screen sedimentation centrifugal machines, and the two stages of centrifugal machines comprise the first-stage screen sedimentation centrifugal machine and the second-stage screen sedimentation centrifugal machine which are directly connected in series; raw coal slurry enters a first-stage screen sedimentation centrifuge, and first-stage centrifugal coal, first-stage filtrate and first-stage centrifugate are produced after low-speed long-time dehydration; the first-stage centrifugate returns to the first-stage screen sedimentation centrifuge again; the first-stage filtrate is directly pumped into a second-stage screen sedimentation centrifuge, superfine particles are separated through high centrifugal force, second-stage centrifugal coal, second-stage filtrate and second-stage centrifugate are produced, and the second-stage centrifugate is returned to the second-stage screen sedimentation centrifuge again; the second-stage filtrate is reused as coal washing circulating water, and the first-stage centrifugal coal and the second-stage centrifugal coal are mixed and then are sold as a single product. Through the two-stage centrifugal mechanism, the dehydration efficiency is improved, the energy consumption is reduced, and the production benefit is improved.

Multi-stage centrifugal atomizer (100), comprising: an outer shell (102) which includes an inlet port (101) and an outlet port (121) and which comprises: a distributor (104), a first inclined rotating surface (106); and a second inclined rotating surface (108); wherein the first inclined rotating surface (106) is arranged opposite the second inclined rotating surface (108); wherein the inlet is used to introduce a molten material into the multi-stage atomizer, and wherein the outlet is used to remove ultrafine particles with a D50 of less than 20 micrometers; and wherein a convex surface of the first inclined rotating surface (106) faces the inlet of the multi-stage centrifugal atomizer (100) and wherein a convex surface of the second inclined rotating surface (108) faces the outlet of the multi-stage centrifugal atomizer (100) and wherein the first inclined rotating surface (106) serves to receive a molten material from the distributor (104) and to discharge the molten material in the form of particles, wherein the second inclined rotating surface (108) serves to receive the particles from the first inclined rotating surface (106) and to reduce them to a smaller particle size than that which is received from the first inclined rotating surface (106).

This invention discloses a reactor and method suitable for ultrafine particle vapor deposition, relating to the fields of chemical engineering and materials preparation technology. The reactor includes a reactor body, a feeding mechanism, and a gas-solid feed pipe connecting the reactor body and the feeding mechanism. The reactor body has a reaction bed section, a conveying bed section, and a descending bed section connected in sequence. The diameter ratio of the reaction bed section to the conveying bed section is greater than 1. At least one gas-phase nozzle is provided on the descending bed section, and a control valve is connected to the end of the descending bed section. The control valve is connected to an outlet pipe and a circulation pipe connected to the feeding mechanism. Thus, by setting the reaction bed section and the conveying bed section with narrower diameters, the apparent gas velocity entering the conveying bed section is automatically adjusted, carrying the solid product out for conveying. Simultaneously, the gas-phase nozzle in the descending bed section provides conditions for the solid product to undergo secondary reactions as needed. The selective connection of the control valve enables the extraction or circulation of the solid product.

The invention relates to the technical field of powder metallurgy, and particularly discloses a method for preparing high-purity rhenium powder, aiming at the problem of low overall quality such as granularity and distribution of a product caused by low controllability of sintering growth of particles in a reduction process in a traditional rhenium powder preparation process. Comprising the following steps: S1, first-stage low-temperature dynamic reduction: putting ammonium rhenate powder into a furnace, introducing hydrogen, and carrying out reduction reaction at 200-500 DEG C for 4-6 hours to obtain a first-stage reduction product; s2, primary jet mill crushing and pre-grading: feeding the first-stage reduction product into a jet mill crusher, and carrying out jet mill treatment by adopting inert gas to obtain superfine reduction powder; s3, second-stage high-temperature static reduction is conducted, specifically, the superfine reduction powder is placed in a furnace, hydrogen is introduced, a reduction reaction is conducted for 4-6 h at the temperature of 700-900 DEG C, and reduced rhenium powder is obtained; and S4, secondary jet milling fine crushing and final grading are conducted, specifically, the reduced rhenium powder is subjected to jet milling treatment again, and the high-purity rhenium powder which is high in purity, superfine in granularity, narrow in distribution and free of pollution is obtained.

The present application relates to the field of particle detection, and specifically provides a method and device for identifying and counting ultrafine particles based on photoelectric effect, and a storage medium, comprising: obtaining photoelectric signals generated by a flow of particles to be detected passing through a photoelectric detection array; extracting original features of the photoelectric signals, combining time domain decomposition and frequency domain transformation to construct an initial signal feature matrix; performing multi-scale tensor decomposition and signal component screening on the initial signal feature matrix to generate enhanced photoelectric signals; determining a polarization coherence angle interval based on the enhanced photoelectric signals, extracting polarization energy features, analyzing polarization state conversion characteristics, and establishing a three-dimensional polarization feature fingerprint; performing adaptive segmentation processing on the enhanced photoelectric signals, extracting oscillation feature spectrum, and combining the three-dimensional polarization feature fingerprint to obtain a feature correlation matrix; and constructing a multi-dimensional classification criterion based on the feature correlation matrix, and determining a final particle count result accordingly. The present application improves the accuracy and recognition ability of ultrafine particle counting, and is particularly suitable for high-density micro-nano particle detection in complex environments.

The invention discloses an intelligent self-cleaning oil smoke interception system based on a bionic cilium array, which realizes graded efficient interception of oil smoke particles through the bionic multi-stage cilium array, and integrates intelligent control modules for self-adaptive vibration cleaning, cilium surface functional modification and airflow and temperature collaborative sensing. The system can sense the oil smoke load and cilium pollution state in real time and dynamically adjust the cleaning strategy; a micro-nano composite structure super-oleophobic coating is constructed on the surface of the cilia; and meanwhile, auxiliary electrostatic adsorption and a local heat energy field are introduced, so that the capture rate of ultrafine particles is remarkably increased, and oil drop desorption is accelerated. The interception efficiency, the self-cleaning capability and the intelligence are remarkably improved, and the passive filtering mode of a traditional range hood is thoroughly changed.