Multi-layer circulation dryer

Abstract

The invention relates to a multi-layer circulation dryer, comprising a hot smoke wind room, a dedusting and desulfurizing tower, a storage silo, a coal distributing machine, a drying room with a smoke outlet, a drying cart with an air foil, a wind room with a wind distributing opening, a reciprocating fire grate, a double-roller material distributing machine and a frame. The dryer is characterized in that the dedusting and desulfurizing tower and the hot smoke wind room form an up-and-down structure; multiple layers of ring-shaped drying devices are arranged at the periphery of the dedusting and desulfurizing tower and the hot smoke wind room; the upper part of each layer of drying device is provided with a ring-shaped drying room, the lower part thereof is provided with a ring-shaped wind room; the ring-shaped drying room is connected with the dedusting and desulfurizing tower by a smoke discharge pipeline; the ring-shaped wind room is connected with the hot smoke wind room by a wind inlet pipeline; the drying cart which moves along the circumference is arranged between the ring-shaped drying room and the ring-shaped wind room; the drying device at the top layer is provided with the storage silo and the coal distributing machine, the drying device at the lower layer is provided with the reciprocating fire grate and the double-roller material distributing machine. The multi-layer circulation dryer has the advantages that as boiler tail gas serves as hot wind energy for drying, lower temperature drying is realized, the heat energy cost is low and heat energy use ratio is improved. In addition, the drying area is greatly increased, final dusting is achieved and smoke dust concentration is reduced. Furthermore, as the multi-layer ring-shaped drying device is adopted, the multi-layer circulation device takes small space.

Description

Technical field [0001] The invention belongs to a coal-fired drying equipment, particularly a multi-layer circulating dryer. Background technique [0002] The moisture content of coal in my country is mostly around 10-20%, and the moisture content of lignite is as high as 30%. Due to the high moisture content of coal, the calorific value of coal combustion decreases, and the transportation volume increases under the same heat. Therefore, coal drying, especially lignite drying, is an important measure to increase the calorific value of coal and save transportation capacity. [0003] At present, my country's coal drying technology is relatively backward, and the existing coal drying equipment adopts rotary drum drying. As coal rotates in the drum, most of the coal dust is taken away by the hot air, which not only causes energy loss, but also causes air pollution. At the same time, drum-type coal drying requires hot air above 600°C, high thermal energy consumption, and equipment exha...

AI Technical Summary

Problems solved by technology

Because the coal rotates in the drum, most of the coal dust is taken away by the hot air, which not only causes energy loss, but also pollutes the air environment. At the same time, the drum type coal drying re

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