Waste gas treatment system of coated sand workshop

Abstract

The invention relates to a waste gas treatment system of a coated sand workshop. The waste gas treatment system comprises a plurality of top suction type waste gas collection hoods installed in a production workshop, wherein the top suction type waste gas collection hoods are connected to a swirling flow plate tower for dust removing through a pipeline system, the rear of the swirling flow plate tower is sequentially connected to a filler tower for oxidization dissolving neutralization and an active carbon box for adsorption treatment, and is connected to a discharge chimney through a fan connected on the rear of the active carbon box, the top suction type waste gas collection hood is tapered gas collection hood, the upper portions of the top suction type waste gas collection hoods are connected to middle pipes in parallel respectively through a branch pipes or are externally connected to the gas inlet on the side wall of the lower portion of the swirling flow plate tower through a total pipe, and the branch pipes and the middle pipes or the total pipe form the pipeline system. According to the present invention, the waste gas treatment system has characteristics of reasonable structure, convenient installation and use, production working environment improving, worker health achieving, production hazard reducing, work efficiency improving and the like.

Description

technical field [0001] The invention relates to a waste gas treatment system of a coated sand workshop, which belongs to the technical field of waste gas treatment. Background technique [0002] Most of the castings in the molding and core making of coated sand casting are wet and dry castings, and more than 90% of the sand cores use sand core oil dried in a drying oven as a binder. The raw materials of shell sand are mainly composed of artificial resin (binder), raw sand, hardener, lubricant and other additives. Coated sand is made of resin coated on the surface of sand grains in the form of a film. Most of the existing coated sand casting is a thermal coating process, which is a method suitable for preparing coated sand in large quantities. When mixing sand, the sand is generally heated to 140-160 ° C, and resin is added to mix with hot sand. Evenly, the resin is heated and melted, covering the surface of the sand grains. When the temperature of the sand drops to 105-11...

AI Technical Summary

Problems solved by technology

When the temperature of the sand drops to 105-110°C, add the aqueous solution of urethane product, then blow it to cool, and then add calcium stearate and mix well; due to the waste gas generated during molding and pouring, if the hardener is heated, it will mix with the The water reacts to produce formaldehyde and ammonia. Therefore, the polluted waste gas in the coated sand casting workshop is mainly particulate matter, phenol, formaldehyde, ammonia and nitrogen oxides. Although the concentrations are not high, they all belong to the continuous emission type with large air volume. Pollutants, which have a great impact on the production environment of the workshop

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