A fluidized bed dryer based on graphene far-infrared heating and drying method thereof

Abstract

The invention discloses a fluidized bed dryer based on graphene far-infrared heating and a drying method thereof. An air expansion pipe is arranged under the dryer to communicate with the bottom air supply channel, and the other end of the bottom air supply channel is connected to the air outlet of a centrifugal fan. The air inlet of the centrifugal fan is equipped with a return air pipe assembly, which is connected to the air outlet above the dryer through the air return pipe assembly. The top of the dryer is also equipped with a feeder; The inner wall of the drying chamber is provided with a graphene far-infrared radiation plate, the bottom of the main drying chamber is provided with a bottom punching plate, the top side wall of the main drying chamber is provided with an outlet punching plate, and the main drying chamber is equipped with a far-infrared heating plate. The plate group, the far-infrared heating group includes several graphene far-infrared radiation plates arranged at equal intervals. The invention can greatly improve the quality and drying rate of dried small-grain agricultural product materials (such as rice, wheat, rape, etc.), and reduce drying energy consumption.

Description

technical field [0001] The invention belongs to dryer technology, and in particular relates to a fluidized bed dryer based on graphene far-infrared heating and a drying method thereof. Background technique [0002] Traditional hot air fluidized bed drying has the characteristics of fast drying speed and high efficiency, but because hot air is used as the heat source for drying, when drying small-grain agricultural products (such as rice, wheat, rapeseed, etc.), the heat is gradually transferred from the outside of the grain to the inside , the drying rate of the outer layer of the grain is significantly higher than that of the inner core. The outer layer tissue dries and solidifies first. When the inner core moisture diffuses outward in the later stage of drying, it is hindered by the solidified surface tissue. Excessive heat and mass transfer can easily lead to excessive internal pressure of the grain. Resulting in a burst waist. Therefore, when the rice is dried by the fl...

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Problems solved by technology

However, at present, the relevant equipment mainly uses high-temperature (400-800°C) heating elements to emit infrared rays to the thin layer of grain. The high-temperature heating elements cannot be in contact with the materials, so that the amount of dried materials in each batch is small, and there is a risk of open flames.

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