58 results about "Ultrafine particle" patented technology

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 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 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.

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.

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.

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.

Aspects of the present disclosure relate to devices and methods for estimating and utilizing ultrafine particle concentration. The method (500) comprises: receiving (501) data indicative of a measured ultrafine particle concentration and a measured nitrogen oxide concentration, the measured ultrafine particle concentration and the measured nitrogen oxide concentration relating to each of a plurality of locations and a corresponding time of a plurality of times; establishing (502) a correlation between the concentration of the ultrafine particles and the concentration of the nitrogen oxides as a function of the measured concentration of the ultrafine particles and the measured concentration of the nitrogen oxides; estimating (503) the ultrafine particle concentration from the nitrogen oxide concentration measured at the location at which the ultrafine particle concentration is to be estimated according to the correlation; and comparing (504) the estimated ultrafine particle concentration to at least one ultrafine particle concentration threshold to determine whether the estimated ultrafine particle concentration is above or below the at least one ultrafine particle concentration threshold.

An image forming apparatus includes a fixing device, a duct, an exhaust fan, and a switch. The duct is coupled to the fixing device to take in air and discharge the air outside the image forming apparatus in a discharge direction. The duct includes a first filter, a second filter, a first exhaust path, and a second exhaust path. The first filter collects first substances other than the ultrafine particles in the air. The second filter collects second substances including the ultrafine particles in the air. The first exhaust path includes the first filter and does not include the second filter. The second exhaust path includes the first filter and the second filter. The exhaust fan is at a downstream end in the discharge direction of the duct, to take in the air into the duct. The switch switches between the first exhaust path and the second exhaust path.

The present invention aims to provide a particle size control agent for inorganic ultrafine particle slurry capable of controlling the volume average particle diameter (D50, dynamic light scattering method) of inorganic ultrafine particles in inorganic ultrafine particle slurry to 100 nm or less. The present invention is a particle size control agent for inorganic ultrafine particle slurry characterized by comprising a salt (B) of a hydroxycarboxylic acid having 2 to 7 carbon atoms and ammonia or an organic amine having 1 to 14 carbon atoms. The salt (B) is preferably composed of 100 mol of the hydroxycarboxylic acid and 50 to 350 mol of ammonia or the organic amine.

The invention discloses a diesel engine ultrafine particulate matter efficient trapping catalyst and a preparation method thereof. The catalyst comprises a wall flow type DPF carrier, a first coating and a second coating, wherein the first coating and the second coating are loaded on the wall flow type DPF carrier; the first coating is a catalytic active layer containing single platinum or platinum-palladium bimetal and is distributed in a wall pore channel of the wall flow type DPF carrier; the second coating is an inert coating and comprises aluminum oxide or silicon-aluminum oxide with the apparent density ranging from 0.05 g / cm < 3 > to 0.25 g / cm < 3 >, a binder and cellulose, the second coating is distributed on the outer wall of the air inlet side of the wall flow type DPF carrier, and a thin and breathable inert filtering layer is formed on the outer wall; the binder is one or more of alumina gel, silica gel and zirconium gel. The catalyst provided by the invention can quickly intercept most of superfine soot so as to prevent the catalytic active layer from being in direct contact with the soot to aggravate oxidation of soot particles, so that the number of the superfine soot particles is quickly increased, the leakage of the superfine soot particles is effectively prevented, and the purpose of improving efficient capture of the superfine soot particles is achieved.

The utility model relates to a sealing device for tin smoke dust conveying equipment, which comprises a packing chamber, packing arranged in the packing chamber, a gland connected with the packing chamber and a rotating shaft penetrating through the packing chamber, the packing comprises at least two groups of packing layers, an oil storage ring is arranged between the two groups of packing layers, and an oil storage part is arranged on the outer wall of the packing chamber; the outer diameter of the oil storage ring is smaller than the inner diameter of the filler chamber, a lubricant circulation gap is formed, the inner diameter of the oil storage ring is larger than the outer diameter of the rotating shaft, and a non-contact fit gap is formed. An annular oil storage groove and a radial oil guide hole communicated with the oil storage groove are formed in the oil storage ring; the oil storage part is connected with the filler chamber, and an oil outlet hole of the oil storage part corresponds to the radial oil guide hole in position and forms a continuous oil way channel. The problem of abrasion caused by penetration and viscous agglomeration of superfine particles is solved, and the continuous operation period of equipment is prolonged; the maintenance cost is reduced, the filler replacement frequency is reduced, the manual intervention frequency is reduced, and the tin processing cost per ton is reduced; shaft power loss is reduced, and equipment energy efficiency is remarkably improved.

An easily assembled aroma atomizing diffusion module includes: a base with a circuit board, a motor pump, and a rechargeable battery; and a spray assembly consisting of an atomizing diffuser head, an aroma container, and a bottom sleeve. The atomizing diffuser head has an internally threaded interface at the bottom to connect to the aroma container and contains an inverted L-shaped tube. One end of the tube is connected to the motor pump for air supply, and the other end is connected to a throat-shaped atomizer. The upper and lower tubes are staggered, and the shearing and siphoning action between the nozzle and the misting section atomizes the aroma liquid drawn in by the suction tube into ultrafine particles, which are then discharged through the mist chamber and the mist outlet. Its features include a linear stacked design, small footprint, quick shell replacement for diverse appearances, an internal throat-shaped structure for easy assembly, disassembly, and cleaning, and a mist shield to prevent large particle splashing, simplifying maintenance and improving atomization efficiency.

A method for estimating and utilizing ultrafine particle concentration includes: receiving data indicative of a measured ultrafine particle concentration and a measured nitrogen oxide concentration correlated to each location of a plurality of locations and a corresponding time of a plurality of times; establishing a correlation between ultrafine particle concentration and nitrogen oxide concentration from the measured ultrafine particle concentrations and the measured nitrogen oxide concentrations; estimating, from a nitrogen oxide concentration measured at a location where the ultrafine particle concentration is to be estimated, the ultrafine particle concentration according to the correlation; and comparing the estimated ultrafine particle concentration with at least one ultrafine particle concentration threshold to determine whether the estimated ultrafine particle concentration is higher or lower than the at least one ultrafine particle concentration threshold.

The present application relates to the technical field of dust collector, in particular to a gas distribution device for removing ultrafine particulate matters based on wet-type electric dust collector. The device comprises a support, a dust collector shell and a purifier communicated with the top of the dust collector shell. The bottom of the support is provided with a dust collecting hopper. The dust collecting hopper is communicated with a dust gas inlet and a discharging pipe. The support is provided with a plurality of dust collecting plates and discharge electrode plates arranged alternately along the horizontal direction. A circulating liquid supply device is arranged on the top of the support. The circulating liquid supply device is used to form a continuous water film from top to bottom on the surface of the support to flush the captured particulate matters. The cam is periodically rotated to make the flow limiting plate reciprocate, so as to change the size of the water film passage section, thereby forming pulse flushing to the dust attached to the dust collecting plate, reducing the adhesion of particulate matters on the dust collecting plate and improving the purification effect of the particulate matters.