Grain drying equipment is the use of thermal energy of the drying medium, and the process of reducing or removing moisture in the material is called drying. In the field of storage and processing of agricultural products, drying has a very important significance. For example, China's grain and food harvested each year is estimated to account for 1.5% to 3% of the total output due to improper drying, and the south is a province with relatively long mildew season (Jiangsu, Zhejiang, Anhui, and Hubei). Each year, the loss of food and mildew is estimated to be about 10% of the total grain output of the year. Therefore, the choice of drying equipment also appears to be of great significance. Drying can maintain and improve the quality of agricultural products to facilitate storage and processing, prevent mildew, enzymatic and insect damage, and reduce losses.
The economic value of some dried agricultural products (such as dried fruits, dehydrated vegetables, Chinese herbs, tobacco leaves, etc.) is also relatively high, and some of the contradictions in the supply and demand of the market can be regulated. Common drying equipment includes fixed bed dryers and tunnel drying. Machines, belt dryers, tower dryers, spray dryers, fluidized beds, and spouted bed dryers. The following focuses on fluidized bed and spouted bed dryers.
1. Vibrating fluidized bed drying equipment: A spring is installed on the fluidized bed housing, and the motor can be vibrated by rotating the motor. The first half of the fluidized bed is the drying section. The air heated by the steam enters the bed from the bottom of the bed. The second half is the cooling section. The air passes through the filter and is sent to the bed by the fan. During work, the material enters the front of the fluidized bed through the feeder. Under the action of fluidized bed vibration and under-bed airflow, the material moves at a uniform speed along the bed, and is heated and dried at the same time, followed by cooling, and the final product is discharged through the discharge port.
2. Spouted bed drying equipment: It consists of spouted bed, fan, air heater, cyclone separator and so on. The spouted bed is cylindrical and the lower part is conical. In operation, the wet material enters the spouted bed through the screw feeder. The air is heated by a blower and a heating furnace. The butterfly valve enters the material layer at a high speed from the bottom of the cone, and a part of the material is punched up to move upwards to form a central passage to the top of the bed like a fountain. It is sprayed from the center to the surrounding area. Scattered to the bottom of the cone and then uplifted by updraft jets, so that the cycle of spraying, to dry, after the bottom of the discharge valve, release the finished material. Then dry the next batch of material.
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