2954 results about "Filter material" patented technology

One aspect is a method for producing a first intermediate product. A feedstock is provided that comprises a first polyester. The first polyester is contacted with a further organic compound in a volume section V3 to obtain a further initial mixture. A weight average molar mass of the first polyester is reduced in the volume section V3 to obtain a first intermediate mixture. The first intermediate mixture comprises a first intermediate product and the further organic compound. First particulated material is added to the first intermediate mixture in a volume section V4. A filtering means is pre-coated with the first particulated material. At least one impurity is at least partially removed from the first intermediate mixture using the filtering means. The first particulated material has a median pore diameter in the range of 5 mm to 20 mm.

The invention discloses a self-cleaning mechanism of a differential rotation type multi-stage air purification filter cartridge, and relates to the technical field of air purification equipment. The device comprises a purification shell, a first filter cartridge is arranged in the purification shell, the surface of the first filter cartridge is sleeved with a second filter cartridge, and the surface of the second filter cartridge is sleeved with a third filter cartridge; a driving assembly is arranged at the top of the purifying shell and comprises a driving motor arranged at the top of the purifying shell and a transmission rod installed at the output end of the driving motor. Through meshing transmission of a sun gear and a planetary gear in the driving assembly, differential rotation of the first filter cartridge and the second filter cartridge is achieved, attached particles are stripped in a layered mode through centrifugal force, the self-cleaning efficiency is remarkably improved, the differential design breaks through a static filtering mode of a traditional filter cartridge, particulate matter deposition inertia can be actively destroyed, and surface dust accumulation of a filter material is reduced; the problem of filtering efficiency attenuation caused by dust accumulation is avoided, the service life of the filter cartridge is prolonged, and the maintenance frequency is reduced.

The invention discloses an ionic liquid modified polyimide nanofiber film and an air purification filter screen based on the ionic liquid modified polyimide nanofiber film, and belongs to the technical field of film filtering materials. The preparation method comprises the following steps: firstly, selecting a diamine monomer and a dianhydride monomer to carry out low-temperature polycondensation reaction, and then carrying out solvent replacement and freeze drying to obtain polyamide acid powder; dissolving the powder to obtain a polyamide acid spinning solution, preparing an ionic liquid / polyamide acid spinning solution on the basis, and carrying out electrostatic spinning to obtain an ionic liquid / polyamide acid nanofiber membrane; and finally, carrying out high-temperature thermal imidization treatment to prepare the ionic liquid / polyimide nanofiber membrane. The method is simple and efficient, the problems of low resistance, high pressure drop and the like of a traditional nanofiber film in air filtration are solved, development and application of the nanofiber film in the field of air filtration are further widened, and the nanofiber film has important scientific significance and application value in the fields of high-temperature filtration, gas adsorption and the like.

The invention relates to the field of materials, and provides an asynchronous stretching polytetrafluoroethylene film with high aperture uniformity and a preparation method thereof. The method comprises the following steps: mixing polytetrafluoroethylene dispersion resin with mixed lubricating oil, curing, and then obtaining the polytetrafluoroethylene film through pre-pressing extrusion, multi-module longitudinal stretching and expanding and sizing, wherein the longitudinal stretching module is provided with three sections of temperature zones which are sequentially and adjacently connected, namely a core stretching deoiling zone, a high-temperature activation zone and an annealing rolling zone. Oil-containing stretching is realized by matching mixed lubricating oil with gradient temperature configuration and precise control of stretching speed in a longitudinal stretching stage, and meanwhile, controllability of pore size and high uniformity of pore size are realized by matching proper process parameters such as two-way stretching temperature, speed and multiple; the membrane can be applied to various different scenes as a filtering material.

The invention relates to a bandage, a pleated filter cartridge and dust removal equipment, and belongs to the technical field of filtering and dust removal equipment. The bandage is applied to the pleated filter cartridge and comprises a pleated structural member and a fixing structural member, the pleated structural member comprises an annular body and a plurality of tooth bodies connected to the inner side of the annular body, part of adjacent tooth bodies are arranged at intervals in the annular arrangement direction of the annular body to form receding grooves, at least one adjacent tooth body is arranged at intervals to form mounting grooves, and the fixing structural member is fixed to the annular body. The avoiding groove and the mounting groove are both used for avoiding at least one fold tooth of the filter material; the fixing structural part is arranged in the mounting groove and comprises a clamping piece part with an opening end and a connecting end and a fixing part, the clamping piece part is connected with the fixing part through the connecting end, the opening end of the clamping piece part is used for being connected with the pleat teeth of the filter material, and the fixing part is connected with the annular body. According to the bandage, the pleated filter cartridge and the dust removal equipment provided by the invention, the problems that the bandage is easy to age and deform after being used for a long time and the filtering effect of the filter cartridge is finally reduced are at least solved.

The detachable reactor comprises a water supply pipe, a communicating pipe and a plurality of barrel sets, each barrel set is formed by splicing a top cover, an upper barrel, an upper grating net, a main barrel, a lower grating net, a lower barrel and a bottom cover, and the bottom cover is connected with a water inlet pipe, a water drainage pipe and a series connection pipe through a first reversing valve; the top cover is provided with a water outlet pipe with a valve and flushing pipes, the water supply pipe is provided with a water supply pump and a box body, the box body is provided with a sewage pipe and a dosing mechanism, the communicating pipe is communicated with the series connection pipes and the flushing pipes and provided with a second reversing valve, inner cavities of the upper cylinder and the lower cylinder are filled with filter materials, and an inner cavity of the main cylinder is filled with catalytic filler. Sewage is filtered and catalytically decomposed by using the filter material and the catalytic filler in the cylinder group, the cylinder group is convenient to disassemble for cleaning and replacement, and series connection, parallel connection and backwashing work of the plurality of cylinder groups can be realized through cooperation of each pipeline and each valve, so that the sewage treatment effect is ensured, and the sewage treatment efficiency is improved.

The invention relates to the technical field of high-temperature flue gas filtration, and particularly discloses a composite filter material flame-retardant filter cartridge and a manufacturing process thereof. The manufacturing process comprises the following steps: performing opening, mixing, carding, lapping, grid connection and pre-needling on polyester fibers and glass fibers to obtain a pre-needled felt; performing spunlace reinforcement treatment on the pre-needled felt to obtain a filter material plain felt; singeing the filter material plain felt, dipping the filter material plain felt in the dipping emulsion, mangling and drying to obtain a stiff filter material; pleating the stiff filter material, welding the stiff filter material into a barrel-shaped structure, welding a sealing opening of a fixing bandage, and mounting metal end covers at the two ends of the barrel-shaped structure to obtain the composite filter material flame-retardant filter barrel; the impregnating emulsion comprises the following raw materials in percentage by weight: 30-40% of a flame retardant, 30-40% of a stiffening agent and 30-40% of water. By adopting the steps of fiber compounding, dipping, mangling, drying and the like, the high temperature resistance and flame retardance of the filter material can be improved while the strength of the filter material is kept.

The invention relates to the technical field of high-temperature gas filtration, and particularly discloses a preparation method of a high-temperature-resistant and corrosion-resistant composite spunlace filter material. The preparation method of the filter material comprises the following steps: pretreating the PTFE short fibers, the glass fibers and the high-temperature-resistant glass fiber woven base cloth; mixing the pretreated glass fibers with PI fibers to obtain mixed fibers; the pretreated PTFE fibers and the mixed fibers are respectively subjected to carding, net forming and net laying, the pretreated PTFE fibers form a surface layer, the mixed fibers form a bottom layer, pretreated high-temperature-resistant glass fiber woven base cloth is used as middle base cloth, pre-needled reinforcement and winding are performed to obtain a pre-needled felt, and the pre-needled felt is subjected to spunlace reinforcement, drying and winding to obtain a filter material plain felt; dipping, shaping and laminating the filter material to obtain the high-temperature-resistant and corrosion-resistant composite spunlace filter material. According to the method, a high-temperature-resistant system for increasing the temperature-resistant threshold value layer by layer is formed, the corrosion resistance is enhanced, and synergistic improvement of high temperature resistance and strong corrosion resistance is achieved.

The invention discloses a device and method for preparing biochar from corncobs, and belongs to the technical field of biochar preparation, the device comprises a machine base, a frame is fixed outside the machine base, an outer cylinder is horizontally fixed on one side of the machine base, and the outer cylinder is fixedly connected with the frame; the crushing seat is arranged above the outer cylinder; the combustion system is arranged on one side of the outer barrel, and the combustion system is externally connected with a hot gas booster fan; the sealing end cover is fixed in the outer cylinder body; the carbonization cylinder is rotationally mounted on the machine base, and one end of the carbonization cylinder is coaxially and rotationally connected with the sealing end cover; the heat control unit is arranged in the annular cavity of the carbonization cylinder; the material guide channel is arranged on the sealing end cover; the filter material unit is fixed in the carbonization cylinder; according to the device, a scrap mixture can be graded according to the particle size, primary carbonization of the scrap mixture is achieved, then the scrap mixture is remixed and then subjected to high-temperature pyrolysis carbonization, and the purity and quality of biochar preparation are improved.

The embodiment of the utility model provides a filter plate of a plate-and-frame filter press and the plate-and-frame filter press, and relates to the technical field of filter presses. The filter plate of the plate-and-frame filter press comprises a filter plate main body, a plate frame body and a filter disc plate, and connecting grooves are formed in the front side and the rear side of the tops of the two sides of the filter plate main body. A pressing plate is pressed to drive a pull rod to move downwards, a second clamping plate is driven to move when the pull rod moves, the second clamping plate extrudes and retracts a spring set, at the moment, the second clamping plate is separated from the surface of a first clamping plate, and then a plate frame body and a filter disc plate can be detached for maintenance or replacement; meanwhile, when filtering work is completed and a hydraulic cylinder drives a movable end to be separated from a filter plate main body, a second spring is reset to drive a sliding ring to move on the surface of a positioning rod, so that a supporting plate drives a propping plate to move, and the propping plate drives a guide wheel and the spaced filter plate main body to assist in bouncing off, so that filtered materials are conveniently discharged, the pressure of a shifting device is reduced, and the filtering efficiency is improved. And the discharging efficiency is improved.

The invention discloses a broken stone screening device for a loader, and relates to the technical field of screening equipment, the broken stone screening device comprises a bucket connected to a lifting arm of the loader and a screen drum communicated to the back of the bucket and used for material separation, and screen holes used for filtering materials are formed in the half circumferential surface, close to the bottom of the bucket, of the screen drum; reinforcing frames are fixed to the inner side of the screen drum at equal intervals. According to the broken stone screening device for the loading machine, the loading machine drives an opening of the bucket to rotate upwards, materials are guided into a channel between the screen drum and the rotary drum, meanwhile, the driving mechanism drives the stone inlets which are distributed in a staggered and equal-included-angle mode through the rotary drum to scrape broken stones, and the materials can be conveniently screened from multiple channels; when the dispersing frame at the front end of the middle shaft rod and the material stirring rod at the tail end of the middle shaft rod move in the wave-shaped fluctuation cavity, the dispersing mechanism can disperse shoveled or extruded materials in a reciprocating mode through reciprocating fluctuation, and it is ensured that the device can efficiently screen clustered materials and broken stones.

The invention discloses an integrated device and method for comprehensively evaluating and measuring the filtering performance of a filter material in a filter tank. The integrated device comprises a box body structure, wherein a water inlet and outlet system, a filtering system, a backwashing system, a pressure difference measuring pipe system, a PLC control system and the like are arranged in the box body; the device adopts a water pump to feed water, the water inlet pressure adjusting range is wide, and the pressure drop difference of the filter layer can be equal to the thickness in a proper particle size range; when the filtering speed is too high, the permeability coefficient can be analyzed by adopting two or more than two pressure drop differences and an instantaneous filtering speed fitting change curve. The filtering system can set constant filtering speed and turbidity (suspended solids), the turbidity (suspended solids) and head loss are measured after the filtering system runs for a certain time, and the filtering performance of the filtering system is analyzed according to an index system. The water inlet and outlet ports of the filter column are arranged at equal intervals and in equal size, the measuring pipe can be detached and heightened, filter materials do not need to be replaced, gas and water backwashing can be achieved, integrated movement can be achieved, and switching of analysis and measuring modes of filter layers with different heights in the filter column is facilitated.

The invention relates to the technical field of sewage treatment, and discloses a novel sulfur autotrophic denitrification filter material and a preparation method and application thereof.The particle size of the filter material is 3.0-4.0 mm, and the filter material is prepared from 40%-45% of a composite sulfur source, 70 + / -2% of sulfur and 30 + / -2% of sodium thiosulfate, 30%-35% of modified ceramsite, 50-100 [mu] m / 200-300 [mu] m of bimodal pore size and 8%-10% of a conducting medium. The ratio of graphene to biochar is 3: 1), a buffer medium (5%-7%, Fe2O3 (52% + / -2%), CaCO3 (31% + / -2%) and MgO (17% + / -2%), a binder and an inert filler. The preparation method comprises the steps of raw material pretreatment, mixing granulation, stepped calcination, gradient impregnation, buffer medium directional loading, post-treatment and the like. The filter material solves the problems of by-product accumulation, insufficient microbial adhesion, large pH fluctuation and blockage of a traditional filter material through gradient sulfur release, a three-dimensional electron transfer network, a multistage pore anti-blockage design and a composite pH buffer system, is suitable for sewage denitrification treatment, and is high in denitrification efficiency and good in stability.

The invention discloses a cyclone separation and moving particle bed coupled pulverized coal pyrolysis oil gas high-temperature dust removal system, and belongs to the technical field of coal clean utilization. The system comprises a cyclone separator, a fine filtration unit, a filter material cyclic regeneration unit and an intelligent control unit, the fine filtration unit comprises a particle bed, a particle bin is arranged at the top end of the particle bed, and a composite filter material layer is arranged on the particle bed; a dust-containing high-temperature oil gas pipeline and a pretreatment high-temperature oil gas pipeline are arranged at the top end of the cyclone separator, dust-containing high-temperature oil gas is introduced into the cyclone separator through the dust-containing high-temperature oil gas pipeline to be pretreated, and the pretreated dust-containing high-temperature oil gas is introduced into the particle bed through the pretreatment high-temperature oil gas pipeline to be finely filtered; and a coke breeze discharge pipe is arranged at the bottom of the cyclone separator. The invention is used for solving the technical problem of low gas-solid separation efficiency at high temperature caused by the adoption of a single filter material in the existing pulverized coal dust removal system.

The invention provides a multi-point negative pressure pneumatic conveying system based on powder conveying and a control method, and the system comprises a fan outlet which is connected into a powder conveying pipeline and is used for providing air inlet volume; a plurality of conveying points are distributed on the powder conveying pipe in the blowing-in direction of the air inlet volume, each conveying point comprises a buffer bin for storing powder and a discharging opening, the discharging openings are formed above the buffer bins, the buffer bins are provided with material level switches, the material level switches monitor that the material level reaches the preset material level, and the knife valves below the buffer bins are triggered to be opened in a power line carrier mode; the powder is unloaded to the powder conveying pipeline; the high negative pressure dust remover is communicated with the powder conveying pipeline to form negative pressure conveying, and the powder is collected in a sedimentation and filter material separation mode; and the weighing device is arranged at the lower end of the high negative pressure dust remover and is used for weighing the collected powder. Based on power line carrier communication, the system arrangement cost is greatly reduced, meanwhile, multiple conveying points are adopted for distributed discharging, the powder conveying efficiency is greatly improved, and the conveying time is also saved.

The utility model discloses a denitrification deep bed filter treatment device which comprises a filter body, a water inlet pipe, a water outlet pipe, a filler layer, a gravel layer and a quartz layer, partition plates are uniformly and fixedly connected in the filter body, through holes are uniformly formed in the upper side and the lower side of each partition plate, a dirt scattering channel is formed in each partition plate, and a water collecting pipe is arranged on one side of the filter body. The bottom side in the filter tank body is fixedly connected with a fixing plate, the fixing plate is provided with a groove, a first baffle is fixedly connected in the groove, the bottom end of the first baffle is fixedly connected with a driving motor, and the output end of the driving motor is fixedly connected with a second baffle; according to the utility model, the spacing plates are arranged among the filler layer, the gravel layer and the quartz layer, the through holes are formed in the spacing plates, then the sewage discharge channels are arranged in the spacing plates, and the impurities of the filter material are treated through the water collecting pipe, the water distributing pipe and the nozzles, so that the layering of the filter material can be ensured, and the treatment efficiency of the impurities and sludge is improved.

The filter element assembly comprises a filter element and an installation structure, the installation structure is arranged in a water tank, the filter element comprises a shell and a filter material, the shell is detachably connected to the installation structure and provided with a filter cavity and a post-filter cavity which are communicated, a water outlet of the post-filter cavity is communicated with a water outlet hole of the water tank, and the filter material is arranged in the filter cavity. A water inlet of the filtering cavity is communicated with an external water source; the filter material is arranged in the filter cavity. According to the technical scheme, the use convenience of the beverage equipment can be improved.

The present invention provides a class of ultra-high molecular weight polyethylene microparticles having a small particle size and a low bulk density. Specifically, the present invention provides microparticles having the following characteristics: (a) a viscosity-average molecular weight in the range of 1 million to 5 million; (b) at least 90% by weight passing through a 100-mesh sieve; a particle median diameter (d50) of 40 μm < d50 < 80 μm; and (c) a powder bulk density of 0.25 to 0.33 g / cm 3 The ultra-high molecular weight polyethylene particles provided by the present invention are suitable for producing microporous filter materials.

The invention discloses a CO detection device for a monorail crane diesel engine, and relates to the technical field of gas detection equipment, the CO detection device comprises a mounting box, a detection assembly is arranged on one side in the mounting box, the detection assembly comprises a detection box, a gas chamber is arranged in the detection box, a laser detector is arranged in the gas chamber, and the laser detector is arranged in the detection box. One end of the air chamber is fixedly connected with an air inlet filtering assembly, and one side of the detection assembly is provided with a back-flushing cleaning assembly used for cleaning the air inlet filtering assembly; one end of the mounting box is rotationally connected with a butt joint used for being in butt joint with an exhaust pipe of the diesel engine. Sampled flue gas is filtered through the gas inlet filtering assembly, high-pressure flue gas is stored through the high-pressure gas storage cavity, the high-pressure flue gas is discharged to the gas inlet filtering assembly when needed through control of the backflushing electromagnetic valve, filter material carbon deposition is removed through gas reverse impact force, and the trouble of frequent manual replacement and maintenance is avoided.

The utility model discloses a multistage denitrification deep bed filter which comprises a filter body, a middle-section filter box is fixedly mounted at the top of the filter body, a top-end filter box is fixedly mounted at the top of the middle-section filter box, and a coarse sand layer is fixedly connected to the position, close to the bottom, in the top-end filter box. A fine sand layer, an activated carbon layer, a fiber filter screen and a membrane filter layer are sequentially and fixedly connected to the interior of the middle-section filter box from top to bottom. According to the multi-stage denitrification deep-bed filter tank, the cleaning brush is arranged in the top end filter tank and is matched with a sliding structure of an air cylinder, a driving motor and a movable plate, so that automatic cleaning of a coarse sand layer is realized, and the cleaning brush is driven by the driving motor, and the air cylinder enables the movable plate to move back and forth along a supporting sliding rod; organic matters, microorganism residue dirt and impurities accumulated on the coarse sand layer are effectively removed, the cleanliness of the pre-filtering layer is remarkably improved, and the phenomena of hardening and blocking of a filter material are effectively prevented.

To provide a compaction state control method of a filter material layer which changes an index of the end of discharge of compaction water according to the state of a filter material, and thereby forming a filter material layer in a state optimal for filtration treatment.SOLUTION: A filtration device for performing compaction treatment of discharging compaction water stored in a filtration tank before filtration treatment from below, and compacting a filter material layer by a dynamic pressure at the time of discharge includes: previously setting a foundation discharge value as a discrimination index of a compaction state; gradually setting a coefficient corresponding to a duration time of an immediately-preceding filtration treatment step; calculating a coefficient from an immediately-preceding filtration duration time; calculating a reference discharge value by multiplexing the foundation discharge value by the coefficient; discriminating that the compaction state is satisfactory, and finishing the compaction water discharge step, when at least one discharge value of the discharge speed and the discharge flow rate of the compaction water reaches a reference discharge value; and discriminating that the compaction state is not satisfactory, and shifting the step to a compaction water storage step again, and thereby improving filtration treatment efficiency, when the discharge value does not reach the reference discharge value.SELECTED DRAWING: Figure 3

The invention belongs to the technical field of intelligent control, and particularly relates to an air purification system based on intelligent perception and a self-adaptive regulation and control method thereof. Comprising a multi-dimensional environment perception unit, an environment data fusion and modeling unit, a self-adaptive regulation and optimization decision unit, a modular air purification execution unit and a man-machine interaction and user preference setting unit. According to the method, multi-element parameters are collected, fusion modeling is carried out, a pollution source is identified and predicted, a multi-target optimization algorithm is applied to generate an optimal purification strategy, and then a purification execution unit is controlled. The indoor air quality can be finely and dynamically managed, the purification efficiency is remarkably improved, energy consumption, operation noise and the service life of a filter material are intelligently balanced, and a personalized healthy breathing environment is provided.

The present invention relates to the technical field of air purification, and particularly provides a nanofiber composite air purification filter material and a preparation method therefor. The nanofiber composite air purification filter material comprises a composite structure consisting of four layers arranged from top to bottom, which are respectively a non-woven fabric, a nanofiber membrane layer, a modified melt-blown non-woven fabric and a spunbond non-woven fabric; the non-woven fabric is PET needle-punched non-woven fabric; in parts by weight, the raw materials for preparing the nanofiber membrane layer comprise: 10-20 parts of polylactic acid, 3-5 parts of a reinforcing agent, 2-4 parts of modified nanoparticles and 100-150 parts of a solvent; and the spunbond non-woven fabric is made of PET or PP. The nanofiber composite air purification filter material provided by the present invention has air-permeability, radiation resistance, and antibacterial properties, can be widely applied in the field of air purification filter materials, and has considerable commercial application value.

This application relates to the technical field of pipelines and discloses a water filtration pipeline, comprising a pipeline body, the pipeline body including a water delivery unit and a filter unit, the filter unit being connected and communicating between the two water delivery units; the filter unit including two main pipes and two branch pipes, the two main pipes being connected to the two water delivery units, the two branch pipes being located between the two main pipes, and the two ends of each branch pipe being connected to the two main pipes, the connection point between the branch pipes and the main pipes being a communication port; each main pipe has a movable blocking seat, and the filter unit has an adjustment device for driving the blocking seat to move; the branch pipes are used to place filter material, and each branch pipe has a material exchange port connected to the branch pipe for replacing the filter material. The branch pipes are detachably mounted with an opening and closing seat at the material exchange port for opening and closing the opening. This application can reduce the impact of replacing filter material on production efficiency.

The invention belongs to the technical field of sewage treatment, and particularly relates to an intelligent response filter material, a preparation method thereof and a denitrification deep-bed filter tank. The intelligent response filter material is of a three-layer composite structure and sequentially comprises a carbon source inner core, a transition layer and a wrapping layer from the inner layer to the outer layer; the carbon source core comprises aquatic plant powder, aggregate and reinforced fibers, the transition layer adopts a hydrophilic modified porous carrier, and the wrapping layer adopts a pH responsive polymer. According to the invention, the intelligent response type filter material prepared from aquatic plant straws is adopted, and the pH response type envelope can automatically adjust the release rate of a carbon source according to the pH change caused by the denitrification process, so that intelligent on-demand supply of the carbon source is realized, and the denitrification efficiency and the utilization rate of the carbon source are greatly improved.

The invention relates to the technical field of water treatment, in particular to a prawn fry raw water biological filter treatment device. According to the technical scheme, the device comprises a pretreatment box, a disinfection box, an adjusting plate, a fine treatment box, a motor and a purification box, a screw is arranged at the output end of the motor, a nut in threaded installation with the screw is arranged at the upper end of the adjusting plate, the outer wall of the adjusting plate is sleeved with an air bag, an air pump is arranged at the upper end of the adjusting plate, and the air pump and the air bag are communicated and provided with an air supply pipe; a pressure relief valve is arranged in the air supply pipe, a disinfection box is arranged on one side of the lower portion of the fine treatment box, sealing gaskets are arranged on the inner wall of the fine treatment box and the outer wall of the purification box, overflow holes are formed in the side wall of the lower end of the purification box, and a filter material layer is arranged in the purification box. Through modular design, the efficiency and economical efficiency of prawn fry raw water treatment are remarkably improved, and the problems that a large-area biological filter cannot flexibly adjust the treatment capacity and is difficult to adapt to different scale requirements are solved.

The invention discloses a preparation method for forming a hierarchical pore filter material through secondary coating. In order to solve the problems that an existing filtering material is single in pore diameter, and filtering efficiency and pressure drop are difficult to consider at the same time, the hierarchical pore filtering material is formed through the following steps that 1, first-time coating is conducted, specifically, a NaCl template agent and a PTFE solution are mixed according to the ratio of 7: 3, 7%-16% of a solvent is added, a NaCl-coated PTFE foaming solution is prepared, a polyphenylene sulfide needled felt is coated with the NaCl-coated PTFE foaming solution, pre-drying is conducted, and then washing is conducted to form a macroporous structure; 2, secondary coating: coating the macroporous layer with a PTFE foaming liquid containing an AC foaming agent, and carrying out stepped sintering to form micropores, so that efficient interception of particles of 0.5-2.5 microns is realized, and the pressure drop is reduced to 116-251Pa. The multi-stage hole filtering material is suitable for high-temperature flue gas treatment such as waste incineration, has high filtering performance and low running resistance, and has remarkable environmental protection and economic value.

The invention discloses a preparation method and application of a PTFE composite filter material with a denitration function, and belongs to the technical field of filter materials. A high-temperature-resistant PTFE polymer needled filter material is used as a base material, and polydopamine and MXene are adopted to carry out functional modification on the fiber surface of the filter material, so that the dispersion degree and the synergistic effect of a catalyst on the fiber surface are improved; the preparation method comprises the following steps: uniformly loading a manganese-cerium denitration catalyst precursor on the surface of a filter material fiber by virtue of an equivalent-volume impregnation method, then calcining to obtain an active component of the denitration catalyst, and finally impregnating in hydrogen peroxide to further activate the composite filter material, so that the low-temperature denitration activity of the composite filter material is improved. The PTFE composite filter material prepared by the invention has good denitration capability at low temperature, retains the original dust filtering effect in the preparation process, can meet the requirement of low-temperature denitration and dust removal integration in industrial tail gas, and effectively overcomes the defects of complexity, high treatment cost and the like of a tail flue gas purification system in the prior art.

The invention relates to the technical field of dust prevention and ventilation, and particularly discloses a dust-proof ventilation structure for a clean room, the dust-proof ventilation structure comprises a supporting platform, a filtering structure, an air outlet pipeline, a cutoff structure and a cleaning device, the supporting platform can support the whole device to operate stably; the filtering structure is arranged at the rear end of the top surface of the supporting platform close to the center; the air outlet pipeline is arranged at an air outlet in the bottom of the right end of the filtering structure. The bottom of the filtering structure is fixedly connected with the supporting platform. The cutoff structure is arranged at the front end, close to the center, of the top surface of the supporting platform, the top of the cutoff structure extends into the center of the top of the separated air outlet pipeline, and the cutoff structure can cut off the air outlet pipeline; the cleaning device is arranged at one corner of the left end of the top face of the supporting platform. According to the device, pollution source input is blocked through mechanical cutoff and impurity collection of the cutoff structure, and internal dust sources generated by filter material dust accumulation are reduced through active dust removal of the cleaning device.

The invention relates to the technical field of dust removers, and discloses a bag-type dust remover for sintering waste gas treatment and a fracturing propping agent ceramsite sand preparation technology.The bag-type dust remover for sintering waste gas treatment comprises a dust filtering chamber, a dust collecting chamber is arranged below the dust filtering chamber, and the bag-type dust remover further comprises a dust filtering unit; the first supporting plate and the second supporting plate are vertically arranged in parallel, a transverse plate is arranged below the first supporting plate, a plurality of dust filtering assemblies are horizontally arrayed on the first supporting plate and the second supporting plate, each dust filtering assembly comprises a polygon prism-shaped filter cylinder, a cylinder support is arranged in each filter cylinder, and each cylinder support comprises a plurality of parallel supporting ribs; and during dust filtration, the filter cartridge and the cartridge support are in a twisting state. According to the device, by increasing the surface area and the wrinkle density of a filter material, the smoke dust collecting capacity per unit volume is remarkably improved, and the filtering efficiency is improved compared with that of a traditional cylindrical filter cartridge; the pulse airflow excites the reciprocating torsional vibration of the filter cartridge, and the energy storage effect of the inertia disc and the conical spring is combined, so that the smoke dust falling rate is increased.