A grain circulation dryer based on graphene far-infrared heating and its drying method

Abstract

The invention discloses a grain circulation dryer based on graphene far-infrared heating and a drying method thereof. Each adjacent two far-infrared heating components and ventilation and dehumidification components are arranged at intervals up and down, and the grain storage components are arranged along the height direction from top to bottom. Above the first far-infrared heating component, there is a synchronous grain discharge module between the last ventilating and dehumidifying component and the collecting hopper at the bottom; the grain materials in the collecting hopper are conveyed to the elevator through the screw conveyor and the hoist At the top, the grain flow direction controller is used to adjust whether the grain material enters the discharge pipe to be discharged from the dryer or enters the grain storage assembly to be dried again. The present invention is based on the principle that the graphene material emits infrared rays at low temperature after electrification, and the surface temperature of the emission source can be precisely adjusted within the range of 40-80°C, and utilizes the characteristic of being able to directly contact with grain materials to fully improve drying quality and efficiency and reduce production costs.

Description

technical field [0001] The invention belongs to dryer technology, and in particular relates to a grain circulation dryer based on far-infrared heating of graphene and a drying method thereof. Background technique [0002] In recent years, my country's large-scale planting and mechanized harvesting technology has developed rapidly, and the harvest of many grain materials has become increasingly concentrated, which requires some medium and large drying equipment to quickly dry these materials. At present, most of the grain drying equipment on the market are based on hot air drying technologies such as cross-flow drying, co-current drying, mixed-flow drying, and co-current and counter-current drying. Since these existing technologies use hot air drying, the outer surface of the grain is first in contact with the hot air, and the heat transfer direction of the grain is the same as that of the grain. The direction of moisture migration is opposite. Drying and curing of the surfac...

AI Technical Summary

Problems solved by technology

Most of the grain drying equipment currently on the market is based on hot air drying technologies such as cross-flow drying, downstream drying, mixed-flow drying, and forward-countercurrent drying. Since these existing technologies use hot air drying, the outer surface of the grain is first in contact with the hot air, and the heat transfer direction of the grain is the same as that of the grain. The direction of moisture migration is opposite, and the surface layer of grains will dry and solidify first, which will hinder the outward migration of internal moisture, resulting in the following technical problems in these dryers: slow drying rate, explosive grains during drying, uneven drying, high energy consumption, and relative energy efficiency Low, serious waste heat and exhaust emissions, etc.

[0005] However, the existing infrared drying equipment mainly uses catalytic far-infrared emitters to emit infrared rays to thin-layer grains with high-temperature (400-800°C) heating elements (low temperature control accuracy and slow response speed), and the high-temperature heating elements cannot be in contact with materials. , the requirements for the equipment structure are extremely high. In addition, because the high-temperature heat source is used to emit infrared light waves, the instantaneous intensity of grain irradiation is large, and the duration of irradiation is short, which can easily cause problems such as uneven drying and low quality.

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