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521results about How to "Avoid corrosion" patented technology

Process for atomizing desulfurization waste water through recycled flue gas of tower type boiler

The invention relates to a process for atomizing desulfurization waste water through recycled flue gas of a tower type boiler. The process comprises the steps that the desulfurization waste water of a desulfurization tower is drained to a stilling basin for preliminary sedimentation, and then the desulfurization waste water is pressurized through a pump and conveyed to a pipeline of a nozzle; part of the desulfurized flue gas is sent to the pipeline of the nozzle through a recirculation fan, so that the recirculation flue gas is in contact with the desulfurization waste water in the pipeline of the nozzle, and the initial temperature of the desulfurization waste water is raised; the nozzle is installed in a vertical flue located at the tail of the boiler, the desulfurization waste water is jetted and atomized, atomization liquid drops into the flue and evaporates quickly, and all ions in the desulfurization waste water are separated by crystallization quickly, captured by a dust remover when entering the dust remover along with the flue gas and discharged outward along with dust. By means of the design of the process, atomization performance of the desulfurization waste water is improved, evaporation of the desulfurization waste water is accelerated, blocking of a jet system can be prevented, the desulfurization waste water is effectively prevented from being jet to the pipe wall, the problem of corrosion of the wall surface of a flue which is caused easily when ordinary flues are used for treating desulfurization waste water is avoided, innocent treatment of the desulfurization waste water in the real sense is achieved, reconstruction investment is small, and operation cost is low.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1

Liquid metal microparticles with core-shell structures and preparation method and application thereof

The invention relates to liquid metal microparticles with core-shell structures and a preparation method and application thereof. Each liquid metal microparticle comprises a core formed by liquid metal and a shell completely wrapping the outer layer of the core, wherein the shell is prepared from an organic high-molecular polymer. The preparation method comprises the steps that the organic high-molecular polymers are dissolved in an organic solvent to form a polymer solution; liquid metal is dropwise added into the polymer solution to disperse the polymer solution into micro-nano particles; and the micro-nano particles are extruded into water through a micropore structure, and thus the liquid metal microparticles with the core-shell structures are obtained after standing. The preparation method of the liquid metal microparticles is convenient and rapid, the sizes of the prepared microparticles can reach the nanometer grade and are uniform and stable, and the problem that the liquid metal microparticles can coagulate again is completely solved. The liquid metal microparticles with the core-shell structures can be quickly prepared in a large scale, and the liquid metal microparticleswith the core-shell structures can be applied to the fields of phase-change microcapsules, nanometer fluids, drug-carrying robots and the like and have excellent application prospects at the industrialization aspect.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Production technology of sulphuric acid

InactiveCN104291276AStrong purification abilityAvoid corrosionSulfur compoundsEnergy inputChemistryPyrite
The invention discloses a production technology of sulphuric acid. The production technology of sulphuric acid comprises the following technological steps: (1) smashing and screening, namely selecting iron pyrite from ore and smashing, sieving and selecting appropriate iron pyrite granules with the granularity of 4-5mm; (2) roasting; (3) purifying; (4) recycling reaction heat, wherein a steam evaporation pipe bundle is arranged in a waste heat boiler, reaction heat obtained during furnace gas cooling is conveyed to a water circulation system or other thermodynamic systems through the steam evaporation pipe bundle; (5) drying; (6) carrying out conversion, wherein gas enters a conversion system through a sulphur dioxide blower, and sulphur dioxide in raw furnace gas is oxidized into sulphur trioxide gas in the presence of a vanadium catalyst; and (7) absorbing. The production technology of sulphuric acid is reasonable and simple in technology, a technological process is greatly shortened, raw materials are fully utilized, less pollutant is discharged, most importantly recovery rate of low temperature waste heat in the sulphuric acid making industry is increased, and waste of energy resources and the like is avoided, so that the production technology of sulphuric acid is applicable to popularization in the sulphuric acid production industry.
Owner:中山市鸿程科研技术服务有限公司

Surface treatment method for aluminum alloys

The invention provides a surface treatment method for aluminum alloys. The surface treatment method for the aluminum alloys comprises the following steps: carrying out surface oxidization on aluminum alloy workpieces by using sulfuric acid to form porous type aluminum oxide films on the surfaces of the oxidized aluminum alloys; dyeing the aluminum oxide films for at least two times in a manner of curing and protecting with combination of photo-sensitive and ultraviolet light, so that the aluminum oxide films has at least two colors; and sealing the dyed aluminum oxide films. According to the surface treatment method for the aluminum alloys, the aluminum oxide films are dyed for at least two times by the manner of curing and protecting with combination of photo-sensitive and ultraviolet light, so that the aluminum oxide films has at least two colors; the method has no requirement on the colors dyed for at least two times; the photo-sensitive dyeing is two-color or even multi-color; the pattern effect has the irreplaceable specificity; the appearance effect of the surfaces of the aluminum alloys is further effectively improved; compared with the prior art, the method can be used for effectively avoiding the defect of the corrosion of the sulfuric acid solution subjected to secondary anodic oxidation to film layers subjected to primary oxidization; the method is relatively high in reliability and stability in implementation.
Owner:SHENZHEN TINNO WIRELESS TECH
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