1065 results about "Chemical cleaning" patented technology

The invention relates to a cooling tower device for recovering heat from waste steam, which adopts three layers of transversely arranged heat exchange tube groups, realizes cascade recovery of heat energy of waste steam through communication of an air inlet and an air outlet, and is additionally provided with fins on the surfaces of heat exchange tubes to enhance the gas-liquid mass transfer efficiency. The core innovation lies in that a built-in mechanical cleaning mechanism is arranged, a driving assembly is in linkage with multiple sets of bidirectional adapters through a rotating shaft, brush rods distributed in the circumferential direction are driven to conduct high-frequency physical scraping on heat exchange pipes and fins, scale deposition is effectively restrained, and compared with traditional chemical cleaning, the shutdown maintenance time is shortened; the steam latent heat recovery rate can be increased, meanwhile, secondary pollution is avoided through a full-mechanical cleaning scheme, modular layout is adopted in structural design, interlayer fluid distribution of the heat exchange pipe set is achieved through a U-shaped pipe and a straight pipe, it is ensured that the resistance coefficient of the system is lower than that of similar equipment, and the device has remarkable energy-saving benefits in industrial scenes such as chemical engineering and metallurgy.

The invention discloses industrial-grade mixed oil produced by utilizing kitchen waste oil and a preparation method of the industrial-grade mixed oil, and belongs to the technical field of recycling of the kitchen waste oil. The invention relates to industrial-grade mixed oil produced by using kitchen waste oil and a preparation method thereof, and the preparation method comprises the following steps: firstly collecting kitchen waste containing the waste oil, and storing the kitchen waste in a container through special equipment; carrying out screen solid-liquid separation, cleaning grease on the surface of the solid waste, and then carrying out precipitation separation; then carrying out centrifugal separation, chemical cleaning, water washing, acid treatment, dehydration, degumming and metal ion removal on the separated grease and oil-containing liquid; carrying out ultrasonic-assisted multistage ester exchange after enzymolysis optimization, carrying out membrane separation on glycerol and fatty acid methyl ester, and carrying out reduced pressure distillation to obtain a high-purity fraction; carrying out adsorption refining, plasma treatment and supercritical fluid extraction; finally, nano particles are added and blended with additives, efficient recycling of the kitchen waste oil is achieved, and then high-purity industrial-grade mixed oil is prepared.

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 provides an optical glass cleaning device, which relates to the technical field of optical glass cleaning, and comprises a cleaning pool, a cleaning pool, a vertical moving mechanism, a clamping mechanism and a turnover mechanism, the vertical moving mechanism comprises two vertical plates arranged on the back face of the cleaning pool, and a transverse plate is fixedly arranged at the tops of the two vertical plates. According to the scheme, through cooperative use of a gear and a gear plate, a rotating shaft is used for driving a clamping mechanism and an optical glass body to rotate by 90 degrees anticlockwise, so that the optical glass body is in a vertical state, chemical cleaning liquid on the surface of the optical glass body drops into a cleaning pool, the surface of the optical glass body is in a relatively clean state, and the cleaning effect is improved. When the surface of the optical glass body is wiped on the back side, no water stain is left on the surface of the optical glass body, so that the cleaning effect on the surface of the optical glass body is improved, the replacement frequency of the cleaning cloth can be reduced, and the cleaning efficiency of the optical glass body is improved.

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 moss cleaning in sewage treatment, and discloses a method for cleaning moss in a sedimentation tank, which comprises the following steps: S1, pretreating moss, and converting the moss into a state convenient to remove by physical and chemical methods; s2, spraying treatment: spraying the moss with reclaimed water containing sodium hypochloride in a temperature range of 20-30 DEG C; s3, performing ultraviolet irradiation, namely performing ultraviolet irradiation on the obtained first moss; s4, inhibiting the growth of moss, namely performing post-treatment on the second moss to inhibit the growth of the second moss; s5, waste is cleaned, moss residues, cleaning agents and other waste generated in the cleaning process are cleaned in time, influences of the residues on water quality are avoided, and moss is prevented from growing again. Through a physical and chemical combined mode, loose moss in the sedimentation tank is effectively removed firstly, then a solution containing sodium hypochloride is used for spraying the moss, it is ensured that all moss patches are in uniform contact, and the ideal chemical cleaning effect is achieved.

The invention belongs to the technical field of wafer production equipment, and particularly relates to wafer double-sided cleaning equipment. The feeding and discharging device and the cleaning system are arranged on the two sides of the carrying assembly, and the carrying assembly is used for transferring wafers between the feeding and discharging device and the cleaning system; the cleaning system comprises a machine frame, a double-face scrubbing mechanism and a secondary cleaning device, wherein the double-face scrubbing mechanism and the secondary cleaning device are arranged on the machine frame. The double-face scrubbing mechanism is used for physically scrubbing the double faces of a wafer. And the liquid medicine spraying mechanism and the two-fluid cleaning mechanism are used for chemically cleaning the top surface of the wafer. The wafer cleaning device is used for solving the problem of poor wafer cleaning effect. The double-sided scrubbing mechanism in the cleaning system can perform double-sided scrubbing on a physical layer on the wafer, then the wafer is conveyed to the wafer placement position through the carrying manipulator for secondary chemical cleaning, and the bottom surface of the wafer is flushed and protected by the bottom surface flushing device, so that impurities are prevented from being attached to the bottom surface of the wafer, and the cleaning effect is improved.

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 relates to the technical field of composite resin preparation, and discloses a silicon-molybdenum alloy target material preparation method which comprises the following steps: preparing raw materials, selecting molybdenum powder and silicon powder with the purity not lower than 99.9%, mixing, putting the raw materials into a vacuum mixer, vacuumizing to 0.01-0.1 Pa, stirring for 1-5 hours, carrying out ultrasonic assistance, controlling the temperature to 25-40 DEG C to prevent oxidation, and carrying out a forming process. Filling the mixed powder into a detachable hard alloy mold coated with a 0.05-0.2 mm boron nitride coating, carrying out cold press molding, maintaining the pressure for 5-20 minutes to obtain a biscuit, sintering, putting the biscuit into a vacuum sintering furnace, firstly carrying out microwave-assisted heating, then raising the temperature to 1500-1800 DEG C, introducing trace argon in the later period to regulate and control a structure, carrying out a post-treatment process, carrying out numerical control processing on a sintered target material, carrying out chemical cleaning on the mixed solution of hydrofluoric acid and nitric acid, and finally carrying out vacuum sintering. Performing plasma treatment; and finally, performing vacuum packaging and filling high-purity nitrogen. The raw materials are high in purity and excellent in granularity; uniformly mixing and preventing oxidation; forming and sintering are precisely controlled, and the quality of the target material is guaranteed; the surface performance is improved through post-treatment, packaging is oxygen-proof and moisture-proof, and the target material meets the high-end industry requirement.

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 provides a metal magnetic powder core production process capable of utilizing waste materials, belongs to the technical field of metal magnetic powder cores, and solves the technical problem that metal waste materials cannot be directly utilized to produce metal magnetic powder cores in an existing metal magnetic powder core production process. The method comprises the following steps: smelting an alloy; pulverizing the waste materials; adding materials and preparing powder; insulating coating; and pressing and annealing. According to the metal magnetic powder core machining device, mechanical waste materials are smelted and crushed, the waste materials can be directly utilized for metal magnetic powder core machining, compared with existing chemical cleaning, large-scale popularization and utilization are facilitated, the leakage hole is formed in the bottom of the smelting furnace, and under the action of the rotating plate rotationally arranged at the bottom of the leakage hole, the metal magnetic powder core machining efficiency is improved. The smelting furnace can directly smelt the magnetic metal waste through the cooling box, granulation is conducted through the rotating plate, the recycling effect of the waste is ensured, and the screen is arranged in the cooling box to collect metal particles.

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 present application relates to the technical field of daily chemical cleaning products, and discloses a kind of wormwood leaf, enzyme laundry detergent, including the following components, by weight percentage: wormwood leaf enzyme: 30-50wt%, environmental protection enzyme: 10-20wt%, composite surfactant: 5-10wt%, including fatty alcohol polyoxyethylene ether sulfate and alkyl glycoside, wherein fatty alcohol polyoxyethylene ether sulfate accounts for 60-80wt% of the total amount of composite surfactant, and alkyl glycoside accounts for 20-40wt% of the total amount of composite surfactant; Dispersant: 0.3-1wt%; Enzyme-surfactant composite catalyst: 1-5wt%. The present invention adopts the technical scheme of combining wormwood leaf enzyme with environmental protection enzyme, extracts active enzyme and natural functional ingredients by fermentation, and realizes efficient decomposition of organic stains such as grease and protein. Compared with the scheme of using only chemical surfactant in the prior art, the problem of environmental pollution and skin irritation of chemical detergent is solved, and the safety and environmental protection of washing are significantly improved.

The invention relates to the technical field of non-ferrous metal wire drawing, in particular to a wire drawing device for copper wire machining. The wire drawing device comprises a base, a processing cavity is formed in the top of the base, a pair of wire winding mechanisms arranged at intervals is arranged on the inner bottom wall of the processing cavity, and a cleaning mechanism, a dirt removing mechanism and a wire drawing mechanism are sequentially arranged between the two wire winding mechanisms; according to the wiredrawing device for copper wire processing, the cleaning bin is used for removing an oxide layer on the surface of a thick copper wire, the heat dissipation interlayer can absorb heat generated in the wiredrawing process of the wiredrawing die, and the heat dissipation interlayer can convey heated cooling liquid into the dirt removal box; the decontaminating liquid in the decontaminating box is used for washing away the residual chemical cleaning agent on the surface of the thick copper wire after being heated, the decontaminating box can convey the cooled decontaminating liquid back to the heat dissipation interlayer so as to cool the wire drawing die, and the decontaminating liquid (namely hot water) retained on the surface of the thick copper wire can lubricate the thick copper wire when passing through the wire drawing die.

The utility model discloses a cleaning machine for dirt on the inner wall of a pipe fitting, and relates to the technical field of pipe fittings. Four cleaning brushes are arranged at one end of the peripheral face of the supporting pipe, two moving wheels are arranged at the other end of the peripheral face of the supporting pipe, the water pipe penetrates through one end of the supporting pipe in a clamped mode, a spraying pipe penetrates through the periphery of one end of the water pipe in a welded mode, and the elastic air bag is fixedly clamped to the center of the peripheral face of the supporting pipe. By arranging the supporting pipe, the water passing pipe and the elastic air bag, the problems that when a cleaning machine is used for cleaning the inner wall of a pipe fitting, complex pipelines are difficult to process in a mechanical cleaning mode, the cleaning cost is high through a large amount of chemical cleaning liquid, and the cleaning machine is usually large in size to guarantee use stability and cannot be used for cleaning the inner wall of the pipe fitting are solved. And the storage is inconvenient.

The invention relates to the technical field of regeneration of deactivated catalysts, in particular to a modification regeneration method of a deactivated SCR (selective catalytic reduction) denitration catalyst, which comprises the following steps: carrying out ash removal treatment on the deactivated SCR denitration catalyst to be treated, and then carrying out chemical cleaning; immersing the cleaned catalyst into the pretreatment liquid for immersion treatment, and then drying and roasting for the first time; immersing the catalyst subjected to primary roasting into deionized water for impregnation, pre-drying, and then immersing into a wide-temperature modified active replenishing liquid for vacuum impregnation treatment; and drying the catalyst subjected to vacuum impregnation, and roasting for the second time to obtain the modified regenerated catalyst. According to the method, the low-temperature denitration efficiency of the inactivated SCR denitration catalyst can be greatly improved while the technical process is simple, the regenerated catalyst can be suitable for the sulfur-containing flue gas environment of a power plant, and the high-temperature SO2 / SO3 conversion rate can be remarkably reduced.

The invention relates to a high-precision and high-resolution solar cell grid line preparation method. According to the method, a direct photoetching technology is adopted, accurate exposure is carried out on a photosensitive adhesive layer through a high-precision designed shading mask, and a patterned opening which is completely consistent with the layout of a grid line on the surface of a solar cell is formed. And then, accurately filling conductive slurry into the opening by using a coating or ink-jet printing technology, removing redundant slurry through mechanical scraping or chemical cleaning, and forming a stable grid line structure with excellent conductivity after high-efficiency grid line forming technical treatment such as drying and laser irradiation or high-temperature heat treatment. According to the scheme, the detail precision and the resolution ratio of the electrode grid line are improved, finer pattern preparation is achieved, the accuracy of the size of the grid line is ensured by accurately controlling the thickness of the photosensitive adhesive layer and the width of the patterning opening, and the overall performance and the photoelectric conversion efficiency of the solar cell can be improved. According to the preparation method, the technological process is simplified, and the production efficiency is 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 discloses a reinforced packaging process of an embedded storage chip, and relates to the field of chip packaging. The invention discloses a reinforcing and packaging process of an embedded storage chip. The reinforcing and packaging process comprises the following steps: S1, chip preprocessing; s2, applying a protective coating; s3, packaging layer processing; the chip pretreatment in the step S1 further comprises the following steps of plasma cleaning, ultraviolet irradiation and chemical cleaning, and the application of the protective coating in the step S2 further comprises the following steps of uniformly coating a layer of protective material after the pretreatment of the surface of the chip is completed to form a primary protective layer, and controlling the thickness of the protective coating to be 100-300nm; the surface of the chip is passivated, and a silicon nitride passivation layer is deposited on the surface of the chip by adopting a plasma enhanced chemical vapor deposition technology, so that the hardness and the corrosion resistance of the surface of the chip are enhanced, charge accumulation on the surface of the chip is reduced, and the chip is prevented from being damaged by electrostatic discharge.

The invention discloses an integrated device for coupling in-situ remediation and membrane filtration water purification of a reservoir water body, which realizes effective removal of pollutants such as ammonia nitrogen, iron, manganese and the like by fusing the advantages of a gravitational flow ultrafiltration (GDM) technology and a water-lifting aeration technology and utilizing the biochemical action of a biological filter cake layer of the GDM technology and an ultrafiltration membrane interception mechanism, so that the water body in-situ remediation and membrane filtration water purification of the reservoir can be realized. Meanwhile, by utilizing the in-situ remediation capability of a water lifting aeration technology, the ecological environment of a water body is improved, and the release of endogenous pollution is reduced; the device continuously runs for a long time under the designed flux, and the membrane pollution is controlled without adopting hydraulic backwashing and chemical agent cleaning, so that the use of chemicals is reduced from the source, pipelines, water pumps and valve accessories for backwashing and chemical cleaning are not needed, the cost can be effectively saved, and the workload of operation, operation and maintenance is greatly reduced; in addition, solar energy is adopted as a power source, green power supply is achieved, energy consumption is reduced, and negative effects on the environment are effectively relieved.

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 relates to the technical field of water treatment, in particular to a nanofiltration membrane and a preparation method thereof. The preparation method comprises the following steps: soaking a base membrane in a water phase solution, taking out the base membrane, performing surface drying, coating the base membrane with an oil phase solution, performing interfacial polymerization reaction, and curing to obtain the nanofiltration membrane, the water-phase solution comprises a polyamine monomer, a surfactant, an acid-binding agent and water; the acid binding agent is bicarbonate; the oil phase solution comprises an acyl chloride monomer, an organic solvent a and an organic solvent b; the organic solvent a is ethyl cyclohexane; the organic solvent b comprises at least one of methane chloride, monochloroethane, diethyl ether, methyl ethyl ether, dimethyl ether and methyl formate. The membrane flux is improved while the acid chemical cleaning resistance of the membrane is improved.

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 relates to a surface treatment method for stainless steel coated tableware, and belongs to the technical field of metal surface treatment. The corrosion resistance and light weight of the stainless steel tableware are achieved through base material pretreatment, chemical cleaning, activating treatment, heating in a vacuum environment, ion bombardment cleaning, preparation of a bottom Ti layer through a physical vapor deposition method, preparation of a middle TiC layer through a chemical vapor deposition method, preparation of a surface TiO2 layer through high-temperature oxidation and preparation of a hydrophobic and oleophobic layer through a chemical vapor deposition method. A Ti layer is formed on the contact stainless steel bottom layer through multi-layer titanium plating, a TiC layer is formed in the middle, a TiO2 layer is formed on the surface layer, better corrosion resistance and abrasion resistance are achieved through the complementary characteristic of materials of all the layers, and then the hydrophobic and oleophobic properties of the TiO2 surface layer are enhanced through chemical vapor deposition of fluoride.

The invention relates to a process for preparing regenerated polyester from a waste polyester material, and belongs to the technical field of waste polyester reutilization. According to the method, impurity residues in the waste polyester material are effectively reduced through two-stage chemical cleaning, and the purity of polyester fragments is improved. The polyester fragments and ethylene glycol are rapidly depolymerized through microwave heating under the action of a tetrabutyl titanate catalyst, so that the reaction efficiency and the product controllability are remarkably improved. And in the polycondensation stage, the epoxy chain extender and the modified nano silicon dioxide are added, so that the molecular structure of the regenerated polyester is further enhanced, and the mechanical property and the thermal stability of the regenerated polyester are improved. In addition, the addition of the antistatic agent prepared by taking the polyurethane coated carbon nanotube as a core and grafting a polyester compatible monomer on the outer layer effectively improves the electrical performance of the regenerated polyester, and enhances the application stability of the fiber.

The utility model relates to a plate heat exchanger cleaning device which comprises a dosing barrel, a chemical cleaning pump and a stainless steel security filter, a liquid medicine outlet is formed in the bottom end of the right side of the dosing barrel, and the liquid medicine outlet is connected with the liquid inlet end of the chemical cleaning pump through a UPVC pipe. The liquid outlet end of the chemical cleaning pump is connected with a filter inlet formed in the bottom end of the left side of the stainless steel security filter through a seamless steel pipe; a filter outlet is formed in the middle of the left side of the stainless steel security filter, the filter outlet is connected with a heat exchanger inlet flange of the plate heat exchanger through a stainless steel metal hose, and a heat exchanger outlet of the plate heat exchanger is connected with a cleaning liquid reflux inlet formed in the top end of the dosing barrel through a stainless steel metal hose. The problem of scale deposition of the plate heat exchanger is solved in a chemical cleaning mode, the situation that fins are physically cleaned one by one is changed, the shutdown maintenance time is shortened, and the equipment operation rate is increased.

The invention discloses an MBR membrane separation system applied to sewage treatment, and relates to the technical field of sewage treatment. The system comprises a bioreactor which is provided with an anaerobic zone, an anoxic zone and an aerobic zone; the MBR membrane assembly comprises membrane frames, membrane modules arranged in the membrane frames, and a membrane protection net arranged at the outermost part of the MBR membrane assembly; the aeration assembly comprises an aeration head, an air blower connected with the aeration head through a pipeline, and a dissolved oxygen sensor mounted in the aerobic zone; the cleaning assembly comprises a backwashing pump and a medicine storage tank; the pretreatment assembly comprises a grid, a grit chamber positioned behind the grid, a primary sedimentation tank positioned behind the grit chamber, and a flocculant feeder mounted at an inlet of the primary sedimentation tank. According to the invention, the MBR membrane component is arranged, the effluent quality is ensured, the cleaning component realizes regular physical and chemical cleaning of the MBR membrane component, the membrane flux is effectively recovered, the service life of the membrane is prolonged, and the operation cost is reduced.