Recovery method and device of enamelling technique tail-gas

Abstract

The present invention discloses an end gas reclaiming method for a lacquering process including the steps of: A. lacquer liquid being heated; B: organic solvent being heated to volatilizate; C: end gas of lacquer coating process being cooled, condensated, separated and reclaimed. Advantages of this invention are as follows: the organic solvent steam and high temperature air are reclaimed separately from the catalyzed and burnt solvent which is still in use today in lacquer-coating industry by the method of cooling, condensation and separation. The reclaimed liquid turns into reusable organic solvent after a rectifying process while the reclaimed sub-high temperature air is sent back into the hearth to supplement the required energy for heating the lacquer liquid. In the circumferential surface of the inner hearth of the lacquering oven, a plurality of air outlets are arranged in the organic solvent volatilization section,which makes the solvent steam be discharged in time and preventsthe black smoke from being formed due to the metamorphism of solvent steam under overheated condition. Compared with the end gas of lacquering process reclaimed by traditional electrothermal and catalysis-burning process, the end gas reclaimed by the process of cooling, condensation and separation has advantages of innocuity, no-exhaust, energy saving, consume reducing and efficiency increasing.

Description

technical field [0001] The invention relates to a method for recovering industrial waste gas; in particular, it relates to a method and a device for separating and recovering process tail gas in enameled wire production. Background technique [0002] Enameled oven is a special equipment for producing enameled wire. The enameled wire is composed of a conductor and an insulating paint film, and is usually used to wind into a coil for mutual conversion between electromagnetics, and is widely used in various electronic and electrical products. [0003] The production process of the existing enameled wire is: conductor unwinding→annealing→painting→heating and drying→wire winding (finished product). The painting process is to apply insulating varnish on the surface of the conductor. In order to obtain an insulating varnish film with uniform geometric dimensions, the insulating varnish is usually composed of varnish-based substances and organic solvents. Organic solvents account ...

AI Technical Summary

Problems solved by technology

This not only consumes valuable film-forming substances but also increases the emission of greenhouse gases. At the same time, it also wastes energy, reduces energy utilization efficiency, and greatly increases the cost of equipment. The price of each enameled oven is as high as one million US dollars. The above increases the production cost of manufacturing enameled wire, thus limiting the popularization and use of this type of equipment

[0007] To sum up, the catalytic combustion technology is currently used in enamelled ovens; although this technology partially solves the environmental pollution problem caused by enamelled tail gas, it also partially recovers the combustion heat of organic solvent vapor and saves energy, but it still There is a problem of greenhouse gas carbon dioxide emissions; at the same time, the high temperature generated by the combustion of organic solvent vapor is difficult for the equipment itself to completely digest, and it has to discharge high-temperature gas into the atmosphere, which reduces the efficiency of energy recovery; at the same time, organic solvents are used as energy substitutes. Not worth the candle

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