Process method for rapidly drying grains through countercurrent gas flow

Abstract

The invention belongs to the technical field of grain drying, and relates to a process method for rapidly drying grains through a countercurrent gas flow. The process principle is that: based on characteristic conditions and drying process requirements of different types of grains, a grain drying process is divided into preheating, drying, tempering, cooling and other process steps; based on grains requiring drying and having different heat sensitivities and moisture contents, a difference treatment process is adopted at the drying stage to carry out effective drying in stages, and a waste heat recovery and utilization technology is adopted at the preheating stage and the cooling stage to reduce power consumption of the process and improve drying capacity of the system; according to drying process conditions of different grains, different drying mediums are selected to carry out countercurrent gas flow drying; and a working temperature and a flow rate of the drying medium are controlled, such that the grain can be subjected to rapid dewetting under an acceptable temperature condition so as to achieve a grain drying purpose, and the dried grain can meet quality requirements.

Description

technical field

[0001] The invention belongs to the technical field of grain drying, and relates to a process method for rapid drying of grain by countercurrent airflow. The process principle is to divide the grain drying process into preheating, drying, slowing down and cooling process stages according to the characteristic conditions and drying process requirements of different types of grains. For the grains to be dried with different heat sensitivity and moisture content, In the drying stage, the process of differential treatment is used for more effective staged drying, and the waste heat recovery and utilization technology is used in the preheating and cooling stages to reduce the energy consumption of the process and improve the drying capacity of the system; according to the drying process conditions of different grains , choose different drying media for countercurrent air drying; by controlling the working temperature and flow rate of the drying media, the grain can ...

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