Drying plant for high-moisture percentage plaster pasty materials

Abstract

The invention discloses a device for drying paste-shaped materials with high water content, which belongs to the technical field of drying. The device is characterized by mainly comprising a feed system, a dry system, a discharge system and a tail gas treatment system. The dry system comprises a steam boiler, a revolving drum type pressed film sludge drier, a heat exchanger, a forming machine and a secondary drier. The material is input into the revolving drum type drier through the feed system and is extruded and formed in the forming machine after drying; the formed material is dried through hot wind at a vertical interface so that the surface is encrusted; and the encrusted sludge is superposed in the secondary drier introduced with hot air for drying. One part of the dried sludge serves as the fuel for the steam boiler and is burnt to generate steam, while the other part is conveyed to a cylindrical silo directly. The condensed water discharged by the revolving drum type drier is heated into air by the heat exchanger and is introduced into the revolving drum type drier to serve as a drying medium and a water vapor carrying medium. Dried tail gas enters the tail gas treatment system and is discharged after the treatment. The device has the advantages of high drying efficiency for the whole set of the dry system, small generation of pollution and achievable automatic operation.

Description

technical field [0001] The invention belongs to the technical field of drying, and relates to drying equipment for pasty materials with high water content. Background technique [0002] Many methods are known for reducing the moisture content of paste-like materials with high moisture content by thermal drying. Among them, according to the way of contact with materials, it can be divided into direct thermal drying, indirect thermal drying and direct-indirect combined thermal drying. Among them, direct thermal drying can be divided into flash dryer, drum dryer, belt dryer, spray dryer, etc., and indirect thermal drying can be divided into film thermal dryer, disc thermal dryer, etc. . The direct-indirect combined drying system is the integration of convection-conduction technology, and the representative one is the gas convection and conduction heating combined thin-layer drying system launched by Italian VOMM company. [0003] It can be seen from the drying principle that...

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Problems solved by technology

However, this method requires the temperature of the drying medium to be as high as 300°C to 600°C, which will decompose a large amount of organic matter in the sludge, and the large amount of dust will easily cause secondary pollution. The temperature of the drying medium also determines its high energy consumption.

[0006] The main problem existi

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