Aqueous gypsum drying and calcining device and process

Abstract

The invention discloses an aqueous gypsum drying and calcining device. The aqueous gypsum drying and calcining device comprises a roller, rolling rings connected to the roller, supporting wheel sets,a ring gear, a motor, a reducer and a gear, wherein the motor is connected with the reducer. A discharge hole of a screw conveyor is connected with a feed inlet of the roller, and the discharge end ofthe roller is connected with a discharge chamber. An exhaust outlet is formed in the upper end of the discharge chamber, and two discharge openings are formed in the lower end of the discharge chamber. One of the discharge openings is connected with a feed inlet of a returning charge screw conveyer, and a discharge hole of the returning charge screw conveyor is connected with a feed inlet of thescrew conveyor. A spiral pipe is arranged in the roller, the rear end of the spiral pipe is connected with steam inlets, and the front end of the spiral pipe is located outside the roller. The invention further discloses aqueous gypsum drying and calcining process. The aqueous gypsum drying and calcining device has the advantages of multi-function, less equipment, small land occupation, low energyconsumption and high thermal efficiency, has high production efficiency and reliable performance, and can safely operate for a long time.

Description

technical field [0001] The invention relates to a drying device and process, in particular to a drying and calcining device and process for hydrous gypsum. Background technique [0002] At present, there are two technologies for flue gas desulfurization on boilers: dry method and wet method. The wet method mostly adopts the lime water method, thus producing a large amount of hydrous gypsum, which is a highly corrosive substance, and landfilling will affect the surrounding environment. Pollution must be treated, and it is best to form comprehensive utilization through treatment. At present, the best method is to use the calcination method to make hydrated gypsum (CaSO4·2H2O) into hemihydrate gypsum (CaSO4·1 / 2H2O), so as to achieve the purpose of comprehensive utilization. [0003] At present, the calcination and drying of hydrated gypsum generally adopts two-step or three-step technology, that is, drying through a hot gas boiling device, calcination by furnace calcination an...

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Problems solved by technology

[0003] At present, the calcination and drying of hydrated gypsum generally adopts two-step or three-step technology, that is, drying through a hot gas boiling device, calcination by furnace calcination and conveying equipment. This technology has many equipments, high energy consumption, difficult dust removal, and occupation. Due to the shortcomings of large land area and difficult operation, coupled with the increasingly high requirements for energy conservation and environmental protection, this technology can no longer meet the requirements

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