692 results about "Chemical cleaning" patented technology

The invention relates to the technical field of water resource monitoring, in particular to a combined type automatic backwashing filter which comprises a tank body, a separation disc, a backwashing mechanism and a filter element, an inlet pipe, an outlet pipe and a discharge filter pipe are arranged on the outer wall of the tank body, the separation disc is fixed to the inner wall of the tank body, and the backwashing mechanism comprises a physical cleaning assembly and a chemical cleaning assembly. The physical cleaning assembly intermittently moves along the circumference, the chemical cleaning assembly quantitatively feeds chemicals in a segmented mode in the vertical direction, and the multiple filter elements are arranged at the top end of the separation disc in a circumferential array mode and matched with the through holes. Through the synergistic effect of circumferential intermittent movement of the physical cleaning assembly and vertical sectional quantitative dosing of the chemical cleaning assembly, physical washing and chemical treatment are synchronously achieved in the back washing process, viscous pollutants and microbial films are effectively removed, the risk of secondary pollution is reduced, meanwhile, energy consumption is reduced, the service life of a filter element is prolonged, and the service life of the filter element is prolonged. The device has the advantages of efficient cleaning, reliable operation and good economical efficiency.

The invention discloses a biological environment-friendly clothing material with a self-cleaning function and a preparation method of the biological environment-friendly clothing material. According to the invention, the environmental friendliness is obviously improved, and natural components which can be completely biodegraded are adopted and can be quickly decomposed in the natural environment, so that the micro-plastic pollution is reduced; the self-cleaning function is enhanced, and through the synergistic effect of the bionic hydrophobic surface and photocatalytic decomposition, automatic falling and decomposition of stains are achieved; the durability is enhanced, a dynamic self-repairing network can automatically repair daily wear, the service life is prolonged, and the bio-based raw materials are natural, skin-friendly and excellent in air permeability. The supercritical fluid processing and microwave shaping technology replaces a high-energy-consumption process; emission of toxic substances is eliminated, and organic solvents and fluorine-containing compounds are forbidden in the whole process; raw material loss is reduced, and the using amount of functional materials is reduced through an accurate structure regulation and control technology; the maintenance cost is simplified, and the washing frequency and the use of chemical cleaning agents are reduced due to the self-cleaning characteristic; waste is compressed, and resource utilization of by-products is achieved through a closed-loop production system.

The invention relates to the technical field of industrial wastewater treatment, and discloses an efficient two-stage reverse osmosis petroleum coke water treatment system, which comprises pretreatment execution ends, a reverse osmosis core end, a concentration regeneration end and an intelligent control end which are commonly configured with a data feedback module. A step-by-step mechanism is established at the initial stage of wastewater treatment, quartz sand is adopted to intercept large-particle suspended solids, activated carbon is adopted to adsorb and degrade organic matters, softening resin is adopted to replace and remove scaling ions, ozone is adopted to catalyze, oxidize and decompose refractory pollutants, an oxidation-reduction potential dynamic regulation and control mechanism is innovatively introduced, and the dosage of an oxidizing agent is automatically regulated according to water quality and chemical quality; by means of the design, the blocking problem caused by high-hardness waste water is solved, the membrane is prolonged, the solution period is stably solved, the chemical cleaning frequency and agent consumption are reduced, a pollution early warning and closed response linkage mechanism is constructed, membrane damage caused by manual intervention delay is avoided, and the service life of membrane elements is prolonged and reduced.

The embodiment of the invention provides a cleaning and polishing control system and method for a track axle box, which is applied to automatic axle box cleaning and polishing equipment and comprises the following steps: generating an optimal cleaning path and an optimal polishing path according to an axle box three-dimensional model or visual scanning data; pressure and rotating speed parameters are dynamically adjusted according to sensor feedback, operation parameters and fault logs are recorded, and quality tracing and time sequence optimization of cleaning and polishing are supported; the axle box is fixed to a station through a conveying belt or a mechanical arm, and a visual system scans and positions the surface state; large-particle dirt is removed through high-pressure spraying, grease is dissolved through a chemical cleaning agent, and waste water is recycled through a filtering system; the mechanical arm preliminarily polishes the rusted and burr areas according to a preset path; the pressure and rotating speed of the grinding head are adjusted according to feedback of the sensor to realize uniform surface polishing; the cleaning efficiency is improved, the production efficiency is improved, the labor intensity is reduced, the production cost is reduced, customized solutions are adapted according to different production environments and production modes, and an automatic smart factory is built.

The invention discloses an efficient glass fiber plate cleaning and drying process which comprises the following steps: S1, pretreatment: performing appearance inspection on a to-be-cleaned glass fiber plate, and removing unqualified plates of which the surfaces are obviously damaged and cracked; s2, pre-cleaning: putting the glass fiber plate subjected to primary treatment into an ultrasonic cleaning tank, injecting clear water into the cleaning tank, enabling the liquid level of the clear water to completely submerge the glass fiber plate, starting an ultrasonic generator at the same time, and separating dust, loose chippings and other impurities on the surface of the glass fiber plate through the cavitation effect of ultrasonic waves to complete pre-cleaning; and S3, chemical cleaning, wherein after pre-cleaning is completed, the glass fiber plate is fed into a chemical cleaning tank containing alkaline pre-cleaning liquid. According to the technology, multiple cleaning procedures are combined with ultrasonic waves, chemical reagents and nano-particles, vacuum and hot air drying are matched, efficient cleaning and rapid drying of the glass fiber plate are achieved, few impurity residues exist, the water content is low, the surface flatness is good, parameter adaptability is high, energy is saved, environment friendliness is achieved, and the automation degree is high.

The invention belongs to the technical field of TG-DSC testing of metal powder materials, and particularly relates to an anti-oxidation high-precision TG-DSC testing method of high-temperature alloy powder, which comprises the following steps: placing the high-temperature alloy powder in a furnace body of a TG-DSC instrument, carrying out high-purity argon replacement on the atmosphere in the furnace body by taking high-purity argon as furnace body purging gas, and carrying out high-purity argon replacement on the atmosphere in the furnace body; the initial oxygen content in the furnace body is reduced to 0.1 ppm or below; continuously introducing hydrogen-argon mixed gas as flowing gas into the furnace body, controlling the temperature of the furnace body to be increased to a target temperature, and ending the test to obtain a TG curve and a DSC curve of the to-be-tested high-temperature alloy powder; according to the invention, through physical cleaning of oxygen in the furnace body by circulating vacuumizing before testing and chemical cleaning of oxygen permeating into the furnace body by hydrogen-argon mixed gas in the whole process in the testing process, a dual anti-oxidation barrier is constructed, so that oxidation weight increment and oxidation heat release interference of a powder sample are eliminated fundamentally; therefore, the real mass change and the heat flow signal change of the alloy powder sample in the temperature programming process can be accurately measured.

The invention relates to the technical field of water treatment, and provides a reverse osmosis membrane cleaning method, a cleaning agent composition and application. According to the method, whether cleaning is needed or not is determined by comparing initial operation parameters and current operation parameters of a system; the pollutant type is accurately judged by observing the appearance characteristics of the membrane surface and detecting related index parameters; and selecting a corresponding cleaning agent formula according to the pollutant type, and sequentially performing physical washing and chemical cleaning. The cleaning agent composition comprises a biological pollution cleaning agent, an organic pollution cleaning agent and / or an inorganic scaling cleaning agent. By establishing a scientific pollution diagnosis system and a targeted cleaning strategy, the problems of fixed cleaning scheme and low pertinence in the prior art are solved, the pressure difference recovery rate after cleaning can reach 90% or above, the desalination rate recovery rate can reach 99% or above, the cleaning efficiency is remarkably improved, the operation cost is reduced, and the service life of the membrane is prolonged.

According to the efficient water treatment system based on the reverse osmosis membrane and the control method provided by the invention, gradient anti-pollution membrane arrangement and reconfigurable intelligent waterway design are creatively combined, so that a foundation is laid for high-flux and low-pollution operation from a physical structure; meanwhile, a full-closed-loop intelligent control system is constructed, and by fusing fuzzy logic, an optimization algorithm and a neural network prediction model, the system can integrate multi-dimensional information such as inlet water quality, membrane pressure difference and water yield, judge pollution risks in real time and adaptively and seamlessly switch among a high recovery mode, a segmented flushing mode and a prediction cleaning mode, so that the system is high in recovery efficiency and high in reliability. Meanwhile, parameters such as pump frequency and valves are dynamically optimized to find an optimal balance point of recovery rate and energy consumption; according to the invention, the recovery rate can be stably improved, the membrane pollution rate is greatly reduced, the chemical cleaning period and the service life of the membrane element are prolonged, and finally, the comprehensive operation and maintenance cost of the system is remarkably reduced while the water treatment efficiency and the water quality safety are improved.

The invention provides an intelligent maintenance cleaning device for nanofiltration membrane pollution control and a method thereof, and solves the problems of low maintenance cleaning efficiency, poor adaptability of cleaning parameters and pollution conditions and frequent chemical cleaning of an existing nanofiltration system. Belongs to the technical field of membrane pollution control. According to the invention, the filtering system, the cleaning system and the intelligent decision-making module are integrally designed, so that the closed-loop control of the whole process of real-time monitoring, pollution identification, intelligent decision-making and automatic cleaning of the running state of the nanofiltration membrane is realized. The cleaning effect gating memory neural network model is used as a membrane pollution prediction model, membrane pollution can be accurately predicted, and key cleaning nodes can be identified. The optimal membrane cleaning parameters are generated by adopting a non-dominated sorting genetic algorithm, the usage amount of chemical agents and the cleaning cost are reduced, and the membrane pollution control effect is improved. The invention is applicable to the field of drinking water treatment.

The invention relates to the technical field of cleaning clamps, and discloses a semiconductor wafer chemical cleaning clamp which comprises a first plate used for placing and bearing a wafer, a second plate arranged on the first plate and convenient for a user to move the first plate and the wafer through the second plate, and a limiting assembly arranged on the first plate and used for limiting the position of the wafer on the first plate. And an adjusting unit is arranged in the limiting assembly. The position of wafers with different diameters can be limited through the limiting assembly, then the outer surfaces of the wafers are abutted through a guide wheel in the clamping assembly, so that the wafers are abutted among the guide wheel, a first cylinder and two second cylinders, the limited wafers can be clamped and fixed through the device, and the working efficiency is improved. And it is ensured that the wafer cannot fall off and be broken due to shaking during cleaning.

The invention discloses a self-cleaning device for a ballast water pipeline of a tropical scientific investigation ship, the self-cleaning device comprises the ballast water pipeline, a double-rod fixing device, rotation dampers, a screw rod and a rotary scraper, the screw rod is fixed and welded on the inner wall of the ballast water pipeline by the double-rod fixing device, the rotary scraper is fixed on the screw rod through thread engagement and limited by the rotation dampers on the two sides, and the rotary scraper is fixed on the ballast water pipeline. A silicon nitride ceramic shaft seal is arranged at the penetrating connector of the screw and the double-rod fixing device, the rotary scraper body is made of a metal alloy matrix, and the surface of the rotary scraper body is coated with an Al2O3-TiO2 coating. The invention further discloses a working principle of the self-cleaning device for the ballast water pipeline of the tropical scientific investigation ship. Aiming at the special requirements of the operation area of the tropical scientific investigation ship, the rotary scraper is driven by the kinetic energy of ballast water flow, a quickly growing biological membrane is efficiently removed through the centrifugal stripping and shearing stripping effects of the fluid, pollution of chemical cleaning to sensitive ecology such as coral reefs is avoided, and the pipeline blockage risk and the maintenance cost are reduced.

The invention discloses a neutral organic chelating cleaning agent for a boiler, and belongs to the field of chemical cleaning of boiler superheaters of thermal power plants. The cleaning agent is prepared from the following components in percentage by weight: 0.5%-5% of ethylenediamine tetraacetic acid ammonium, 0.1%-4% of acetic acid or ammonium acetate, 0.1%-3% of glycollic acid ammonium or glycollic acid, 0.1%-5% of a pH regulator, 0.1%-1% of a cosolvent, 0.2%-0.8% of a corrosion inhibitor SH369, 0.1%-0.6% of a reducing agent, 0.0%-0.3% of a defoaming agent, 0.0%-0.2% of a surfactant and 84%-93% of water, wherein the pH value of the cleaning agent is 6-8; the cosolvent is tartaric acid and / or hydroxybutyl diacid, the surfactant is nonylphenol polyoxyethylene ether, and the reducing agent is hydrazine. The cleaning agent disclosed by the invention has good dissolving capacity on oxide skin, does not generate precipitates to cause pipe blockage, is a neutral solution, is very small in corrosivity, does not generate intergranular corrosion, is beneficial to protecting various pipes of superheaters and reheaters, and is a safe and efficient superheater cleaning agent.

The utility model discloses a domestic sewer line, and belongs to the field of sewer lines. The domestic sewer line comprises a sewer line and a cut-off piece, the cut-off piece comprises a cut-off valve or a plug block, one end of the sewer line is used for being connected with a pool, and the cut-off piece is installed at the end, close to a public pipeline, of the sewer line and used for cutting off the end, close to the public pipeline, of the sewer line. The end, close to the public pipeline, of the sewer pipeline can be cut off through the cut-off piece, then the chemical cleaning agent is used, the retention time of the chemical cleaning agent in the sewer pipeline is prolonged, and the problem that in the prior art, the cleaning agent cannot make full contact with grease, and consequently the cleaning effect is limited is solved.

The utility model relates to the technical field of chemical production, particularly discloses a turbidity control system for chemical cooling circulating water, and solves the problem that the cooling effect of chemical equipment is finally influenced due to the fact that the circulating water is easily polluted by a chemical cleaning agent or the environment in the process of cooling the chemical equipment by the circulating water for a long time at present. According to the system, a plurality of cut-off control valves are arranged at water inlet and outlet pipelines of a filter, a liquid level meter is additionally arranged at the top of a slurry tank, and a plurality of control valves are arranged between the slurry tank and a press filter, so that circulating water is further filtered through the additional filter when being subjected to conventional cooling heat exchange circulation; the cleanliness of the cooling water entering the circulating water tank is further improved; and the slag slurry water backwashed by the filter is further filtered by the press filter, so that the filtered slag slurry water is pumped into the circulating water tank again, the turbidity of the cooling circulating water is effectively reduced, and the recycling rate of the filtered slag slurry water is improved.

The present invention provides a brazed plate heat exchanger, which includes a fixing frame, and a heat exchange main body is fixed inside the fixing frame; a water treatment assembly, and a water treatment assembly that can slide vertically is sleeved outside the heat exchange main body. The water treatment assembly includes an installation frame, and a multi-layer magnetic treatment part is arranged on the inner wall of the installation frame; the magnetic treatment part includes a plurality of magnetic force blocks evenly distributed inside the installation frame; a plurality of mixing blocks with magnetism, and the mixing blocks are arranged on the heat exchange plates. The technical solution in this application realizes the combination of the physical action of the magnetic mixing blocks and the chemical effect of magnetization treatment, effectively reduces the formation and deposition of scale, the movement of the magnetic balls increases the turbulence intensity, reduces the fluid boundary layer thickness, improves the heat exchange efficiency, reduces the problems of blockage and corrosion caused by scale, reduces the cleaning frequency, extends the equipment operation cycle, reduces or avoids the use of chemical cleaning agents, and reduces the maintenance cost and environmental impact.

The invention discloses a chemical cleaning reagent for aluminum oxide ceramic parts and a cleaning method. The chemical cleaning reagent comprises organic acid, a surfactant, a chelating agent, an oxidizing agent and deionized water. Aiming at the special pollution problem (such as trace metal ions, nano-scale particles and organic matters) of the aluminum oxide ceramic part in the 14-nm manufacturing process, the chemical cleaning reagent formula is optimized, pollutants on the surface of the ceramic part can be efficiently removed, and the cleanliness requirement of the 14-nm manufacturing process is met. The cleaning method comprises the steps of pretreatment, chemical cleaning, rinsing and drying, has the advantages of environmental protection, safety and no damage to the ceramic surface, and is suitable for the field of semiconductor manufacturing.

The invention creatively discloses a high-strength short fiber production process based on silkworm cocoon shells, relates to the technical field of short fiber production processes, and solves the technical problems that an existing technical scheme is easy to shrink and poor in compatibility with other fibers, and the high-strength short fiber production process comprises the following steps: step 1, cocoon shell pretreatment: putting tussah cocoons into a husking machine for shell and cocoon separation, the separated cocoon shells are flattened by the aerostatic press and then input into the slicing machine to be cut into cocoon slices with the length of 2-3.5 cm. According to the cocoon shell separating and cutting device, through combined use of the husking machine, the aerostatic press, the slicing machine and other equipment, rapid separation and accurate cutting of the cocoon shells are achieved, and the problems of low efficiency and impurity residues of traditional manual treatment are solved; a cleaning mode of combining warm water soaking and mechanical stirring is adopted, and 0.1-0.3% of biological enzyme is added, so that the cleaning effect is further improved, the use of a chemical cleaning agent is avoided, the environmental pollution is reduced, and the green and environment-friendly concept is met.

The invention relates to the technical field of semiconductor copper interconnection, in particular to a hole filling method of a copper interconnection semiconductor cooler, which comprises the following steps of: performing multi-stage chemical cleaning treatment on a semiconductor substrate after laser drilling, removing dirt on the surface of the substrate, coarsening the surface of the substrate to increase binding force and removing residual slag at a hole after drilling; the influence on seed layer sputtering in subsequent holes caused by slag accumulation at the hole opening is avoided; and meanwhile, three-step electroplating of the initial copper layer, through hole filling and orifice and surface leveling are adopted, so that cavity-free hole filling and surface nanoscale leveling are realized, and the final product yield is improved.

The present invention belongs to the technical field of industrial wastewater treatment, and discloses an integrated industrial wastewater treatment filtration system and method, the integrated industrial wastewater treatment filtration system comprises: an aerobic tank for performing aerobic biological treatment on industrial wastewater and degrading organic pollutants in the wastewater; the water inlet pump is connected with the aerobic tank and is used for lifting and conveying the wastewater treated by the aerobic tank; the stainless steel filter is connected with the water inlet pump and is used for primarily filtering the wastewater and removing large-particle impurities, and the stainless steel filter is a 0.5 mm filter; the stainless steel filter is connected with a water inlet of the purification membrane group through a pipeline, and the purification membrane group is used for deeply filtering the preliminarily filtered wastewater. According to the scheme, the functions of aerobic biological treatment, physical filtration, membrane filtration, gas-water separation, circular treatment, backwashing, aeration, chemical cleaning and the like are integrated, efficient purification of industrial wastewater is achieved, meanwhile, the operation cost is reduced, and the service life of equipment is prolonged.

The invention discloses a steam generator chemical cleaning agent based on composite EDTA and a cleaning method, the steam generator chemical cleaning agent comprises a main cleaning agent, a corrosion inhibitor, a reducing agent, a dissolution promoter, a defoaming agent, a pH regulator and water, by means of the cleaning agent and the cleaning method, the cleaning time of a steam generator can be shortened, the dirt dissolution rate of a heat transfer pipe is high, and the corrosion amount is extremely low.

The utility model belongs to the technical field of wastewater treatment, and relates to an MVR (Mechanical Vapor Recompression) process device for sintering desulfurization and denitrification wastewater treatment. The MVR process device comprises a wastewater pretreatment module and an MVR low-temperature forced circulation crystallization module which are connected in sequence; the sintering desulfurization and denitrification wastewater firstly enters the wastewater pretreatment module and then enters the MVR low-temperature forced circulation crystallization module, and the wastewater treated by the system can be directly recycled. Meanwhile, the process device disclosed by the utility model can be operated at low temperature; and therefore, scaling of a process device and corrosion of equipment can be avoided. The process device disclosed by the utility model is short in operation flow, small in occupied area and capable of fully utilizing the heat of secondary steam and greatly reducing the cost. In addition, the equipment is simple and convenient to maintain, long in chemical cleaning period, effective and stable in scaling control and long in service life, and is very potential wastewater treatment equipment.

The invention discloses a reverse osmosis treatment method for salt-containing mine well water. The method comprises the following steps: adding a reverse osmosis scale inhibitor into the pretreated and softened salt-containing mine well water, and filtering the salt-containing mine well water in a security filter; the filtered mine water is subjected to heat exchange through a heating heat exchanger and then enters a reverse osmosis device; concentrated water generated by the reverse osmosis device flows back into the reverse osmosis device and is circulated again for reverse osmosis; concentrated water discharged from the reverse osmosis device enters the evaporative crystallization salt separation device; and high-heat condensed water generated by the evaporative crystallization salt separation device is used as a heat source of the heating heat exchanger and chemical cleaning replenishment water of the reverse osmosis device. By adopting a one-stage and one-section design, the reverse osmosis treatment process can be effectively shortened, and the occupied area is reduced; concentrated water is recycled, so that the reverse osmosis recovery rate is greater than or equal to 90%; discharged concentrated water can directly enter the evaporative crystallization salt separation system, high-heat condensate water generated by the evaporative crystallization salt separation system serves as a raw water heat exchange heat source and reverse osmosis chemical cleaning replenishing water, and sodium sulfate decahydrate can be prevented from being separated out from the concentrated water under the low-temperature condition.

The invention relates to the technical field of water quality detection devices, in particular to a water quality detection device. According to the technical scheme, the device comprises a rack and a transparent detection tube mounted in the rack, optical detection modules are fixedly mounted in the rack and located on the two sides of the detection tube, the device further comprises a sliding groove formed in one side of the detection tube, a lifting driving assembly mounted in the rack and used for driving the detection tube to do lifting motion, and a blocking and draining part mounted in the rack, the plugging drainage part comprises a plugging pipe which is rotationally mounted in the rack and used for plugging the sliding groove, and a plurality of drainage mechanisms are fixedly mounted on the plugging pipe. The technical problem that pipeline pollution and detection continuity are difficult to consider in optical detection is effectively solved, the accuracy and reliability of long-term monitoring data are greatly improved, meanwhile, the maintenance frequency and use of chemical cleaning agents are reduced, and the system has the important advantages of being high in automation degree and high in severe water quality adaptability.

The invention discloses a medium-high voltage formed foil and a preparation method thereof, and an aluminum electrolytic capacitor, and the method comprises the steps: placing a corrosion foil sheet in vacuum plasma equipment, processing for a set time, introducing oxygen or a mixed gas of argon and oxygen into the vacuum plasma equipment, and carrying out the treatment for a set time; transferring the foil from the vacuum plasma equipment into a first organic solvent tank to be soaked for a certain time, wherein the boiling point of a first organic solvent is lower than 60 DEG C; and performing formation treatment. According to the technical scheme provided by the embodiment of the invention, the etched foil is pretreated, and the carbon content of the surface of the etched foil is reduced or cleared through the synergistic effect of physical cracking and chemical cleaning, so that the surface activity and cleanliness of the etched foil are improved. Meanwhile, according to the pretreatment step, carbon residues are thoroughly removed, pollution of impurity decomposition to a formation tank is avoided, the service life of tank liquid is prolonged, and meanwhile the current efficiency in the anodic oxidation process and the uniformity of an oxidation film can be improved through the corroded foil with the high surface activity and cleanliness.

The invention belongs to the technical field of reverse osmosis membranes, and relates to a visible-light-responsive carbon nitride / zinc oxide heterojunction modified reverse osmosis membrane and a preparation method thereof.The method specifically comprises the steps that porous ultrathin carbon nitride nanosheets are prepared; synthesizing zinc oxide nanoparticles rich in oxygen vacancies; and compounding the two to form the Z-type heterojunction photocatalyst. The heterojunction is stably loaded in a polyamide separation layer through an interfacial polymerization process, the composite reverse osmosis membrane is prepared, and the membrane disclosed by the invention has a remarkable visible light response characteristic while maintaining a high desalination rate. The method has the core advantages that the visible light utilization rate and the photo-generated charge separation efficiency are remarkably improved through the construction of the heterojunction, so that the membrane can actively and efficiently degrade organic pollutants under illumination, self-cleaning is realized, the anti-pollution capacity is greatly improved, and the chemical cleaning period is greatly prolonged.

The application discloses a MABR membrane aeration biofilm reactor for advanced treatment of sewage, and belongs to the technical field of sewage treatment. The height of the moving seat is adjusted through the adjusting assembly. The fixed ring drives the flexible ring and the scraper to rotate through the plurality of elastic columns, and the mud and impurities attached to the outside of the MABR membrane are scraped. The elastic column and the flexible ring are deformed under the action of external force and are in flexible contact with the outside of the MABR membrane through the scraper, so that the damage of the scraper to the MABR membrane is prevented, and the closely attached biofilm fragments or hard scale on the MABR membrane can be removed. Since the plurality of scrapers are located between the two suction pipes, the fallen mud and impurities can be effectively extracted by the suction holes, so that the secondary pollution of the MABR membrane caused by the floating mud and impurities is prevented. Therefore, the traditional cleaning method of using a single flushing method or using a chemical cleaning method is abandoned, the cleaning effect is improved without damaging the MABR membrane, and the service life of the MABR membrane is prolonged.

The invention relates to a high-frequency electric resistance welding method for a transformer, and relates to the technical field of metal welding. A layer of self-reaction soldering paste is applied to the to-be-welded surface of the coil or the iron core to serve as a middle layer; and performing high-frequency resistance welding after mounting and positioning. The self-reaction soldering paste is the technical core of the invention and is composed of a powder mixture containing a solid chemical reducing agent and nano metal particles and an organic carrier. Under excitation of welding heat, the solid chemical reducing agent is subjected to an in-situ chemical reaction, and metal oxides on a welding interface are effectively removed; and meanwhile, the low-melting-point nano metal particles are rapidly melted, the purified clean interface is filled, and a compact metallurgical bonding layer is formed. Through the synergistic effect of chemical purification and physical filling, a defect-free welding joint is obtained, the welding joint has excellent mechanical strength and extremely low contact resistance, the process window is remarkably widened, and the reliability of the welding process is improved.

The invention relates to the technical field of surface treatment, discloses a dry ice sand blasting-chemical dissolution-ultrasonic collaborative cleaning process for a nano aluminum oxide coating part, and aims to overcome the defects of an existing cleaning technology in the aspects of removing a complex deposited film, protecting the coating integrity and improving the cleaning efficiency. The method comprises the steps of isopropanol soaking treatment, flowing pure water flushing, hot water soaking treatment, carbon dioxide dry ice sand blasting treatment, chemical cleaning of a niflumic acid mixed solution, high-pressure water washing, ultrasonic cleaning and the like. By the adoption of the technical scheme, the efficient, thorough and lossless cleaning effect can be achieved, and the high-standard requirement for cleaning of the nanometer aluminum oxide coating part in the modern industry is met.

The invention provides an anti-pollution large-flux reverse osmosis RO membrane as well as a preparation method and application thereof, belongs to the technical field of reverse osmosis membranes, and discloses an anti-pollution large-flux reverse osmosis RO membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a water phase solution and an oil phase solution, forming a polyamide separation layer through interfacial polymerization, grafting an anti-pollution functional group through post-treatment, and removing an additive complex. The membrane comprises a supporting layer and a polyamide separation layer, the surface of the separation layer is grafted with a specific anti-pollution functional group, and the separation layer has low roughness and a low Zeta potential absolute value. The working principle is based on interfacial polymerization and surface functional modification, and separation, pollution resistance and flux performance are improved by optimizing the structure. During use, water inlet conditions are controlled, and regular chemical cleaning is realized. The membrane balances the separation efficiency, flux and pollution resistance, solves the problems of easy pollution and low flux of the traditional membrane, reduces the operation cost, and improves the water treatment efficiency.

The invention discloses a metal sintering filter and an online cleaning method, the filter comprises a cylinder body, a cylinder cover, a metal sintering filter core and an ultrasonic cleaning device, the cylinder cover and the cylinder body are detachably connected through a bolt, and a sealing structure is arranged between the cylinder cover and the cylinder body; an annular ultrasonic probe is installed at a flange connector in the middle of the inner wall of the barrel through a connecting part, the probe extends into the barrel and surrounds the metal sintering filter element, and all-directional cleaning is achieved by means of the penetrating power of ultrasonic waves. The online cleaning method sequentially comprises the steps of emptying and isolating, reverse blowing of inert gas to remove large particles, acid chemical cleaning and ultrasonic deep cleaning cooperative treatment, boiler water rinsing and neutralizing and drying and resetting. Online efficient decontamination can be completed without disassembling the filter element, the filtering performance of the filter element can be effectively recovered, operation is convenient, stability is high, and the filter element can be widely applied to various filtering scenes needing frequent cleaning.