Screw type fluidized bed dryer

Abstract

The invention discloses a screw type fluidized bed dryer which comprises an exhaust opening (1), a fluidized bed outer shell (2), a spiral plate (3), an air distributing plate (4), a screw feeder (5), a discharging pipe (6), a control valve (7), a heater (8) and an air blower (9). The screw type fluidized bed dryer is characterized in that an annular channel of the spiral plate is placed above the air distributing plate, an inlet end of the annular channel is connected with the fluidized bed outer shell, an outlet end is connected with the discharging pipe, the screw feeder is connected with a spiral plate channel inlet, and the discharging pipe is place at the center of the spiral plate annular channel. According to the screw type fluidized bed dryer, the spiral annular channel is used, the structure is simple, manufacturing is easy, operation is convenient, the investment and the maintaining cost of additional equipment are reduced, continuous feeding of the drier during operation is achieved, the phenomenon of uneven drying due to dry-wet material returning mixing and bonding is avoided, drying energy loss is lowered, drying efficiency is improved, and the phenomena of channeling and slugging are effectively suppressed.

Description

Technical field [0001] The invention relates to a spiral fluidized bed dryer, which belongs to the cross field of energy technology and mechanical engineering technology. technical background [0002] Drying technology is of great significance in the national economy and is widely used in drying in agriculture, mineral processing, metallurgy and pharmaceutical industries. Appropriate drying process and accurate drying operation are related to product quality and drying efficiency. The fluidized bed dryer has the advantages of high heat and mass transfer rate, high drying rate, high thermal efficiency, compact structure, low investment and maintenance costs, and has been widely used in the drying field. [0003] As the types of drying materials continue to increase, the selection of drying methods needs to be comprehensively considered according to factors such as material characteristics, product characteristics, drying efficiency, and drying energy consumption. Therefore, the str...

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Problems solved by technology

[0005] Technical problem: In order to solve the above problems, the object of the present invention is to provide a spiral fluidized bed dryer, which not only has a compact structure, is simple to manufacture, is convenient to operate, and reduces the investment and cost of additional equipment such as agitators, drums and vibrating components. maintenance cost, and can avoid dry and wet materials back-mixing and bonding to cause uneven drying, improve drying efficiency, reduce drying energy consumption, and effectively inhibit channeling and turbulence

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