Belt drier

Abstract

The invention discloses a belt drier. The belt drier comprises a frame; a conveyor belt is mounted within the frame; the belt drier further comprises a plurality of air ducts mounted on the frame; airflow in each air duct blows from one side to the other side of the conveyor belt in a width direction of the conveyor belt; the adjacent air ducts are communicated end to end; an air outlet of a previous air duct serves as an air inlet of the next air duct; a plurality of air ducts are communicated to form an air path in which a heat exchanger is arranged; the first air duct is arranged at one end of less moisture content of materials. Hot air is crossed with a material direction of forward motion to ensure even material moisture content of upper and lower material layers; a temperature of the hot air in the air duct closer to a feed end of the conveyor belt is higher and the moisture content of materials closer to the feed end is also higher; the temperature distribution of the hot air complies with material moisture distribution; and therefore, a drying time is reduced; the nutritive value of materials is guaranteed; the drying efficiency is improved and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a dryer for granular materials, in particular to a belt dryer, which belongs to the field of grain and feed processing equipment. Background technique [0002] The purpose of material drying is to remove excess moisture in the material, prevent mildew and facilitate storage, and maintain or basically maintain the original quality. Therefore, the dryer is one of the indispensable unit equipment in the feed production process. However, its energy consumption accounts for a large proportion of the total energy consumption of the process system, and the drying cost of the product accounts for about 50-60% of the entire product cost. Energy saving in the drying process has always been a problem worthy of great attention. With the rapid development of feed processing, there is an urgent need for a dryer that can improve drying quality and reduce energy consumption. [0003] At present, the belt type hot air dryer commonly used in ...

AI Technical Summary

Problems solved by technology

Therefore, the following problems will arise: (1) The hot air with basically the same temperature and air volume used for materials with high moisture content and low moisture content does not meet the drying characteristics of the materials, and the temperature and air volume are unreasonably distributed, which increases the energy consumption of the dryer; (2) During the drying process, the temperature of the material changes irregularly, resulting in a higher temperature of the final discharge, which leads to an increase in the energy consumption of the dryer; (3) When the moisture content of the material is low, the internal moisture is transferred from the inside to the outside surface mainly due to the temperature difference between the inside and outside of the material. However, the temperature of the outer surface is higher than the internal temperature of the material, which is not conducive to the transfer of internal moisture, prolongs the drying time, and increases the energy consumption of the dryer; (4) During the entire drying process, the air temperature should be controlled below the critical drying temperature of the material, and this critical The level will decrease with the decrease of material moisture during the drying process. Excessively high air temperature will damage the surface layer of the product, making the surface layer hard and easy to break, which makes it difficult for the oil material to penetrate during spraying; (5) The increase of temperature, drying The extension of time will not only destroy nutrients (such as vitamins, etc.), but also cause changes in the protein, fat and carbohydrates in the material

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