The material is spread evenly on the mesh belt by the feeder, and the mesh belt adopts 12-60 mesh stainless steel wire mesh. Driven by the transmission device to move in the dryer. The dryer is composed of several units. Each unit circulates the hot air independently. Part of the exhaust gas is discharged by a dedicated exhaust fan. The exhaust gas is controlled by a regulating valve. The hot air passes through the material laid on the mesh belt from bottom to top or from top to bottom to heat it. Dry and take away moisture. The mesh belt moves slowly, the running speed can be adjusted freely according to the temperature of the material, and the dried product continuously falls into the receiver. The upper and lower circulation units can be flexibly equipped according to user needs, and the number of units can be selected according to needs.
The material in the hopper is evenly spread on the mesh belt by the feeder. The mesh belt generally adopts 12-60 mesh stainless steel wire mesh, which is driven by the transmission device to move in the dryer. The dryer is composed of several units, each unit circulates the hot air independently, part of the exhaust gas is exhausted by a dedicated exhaust fan 4, and the exhaust gas volume of each unit is controlled by a regulating valve. In the upper circulation unit, the wind from the circulation fan 5 enters the lower cavity of the unit through the side air duct, and the air flow is heated by the heater 7 upward, and after being distributed by the distributor 6, the jet stream is blown to the mesh belt and enters the upper cavity after passing through the material. Cavity. The drying process is a process in which the hot air flows through the material layer to complete the heat and mass transfer. The upper cavity is connected with the fan inlet by a wind pipe. Most of the gas circulates, and part of the gas with lower temperature and higher moisture content is discharged as exhaust gas through the exhaust pipe, regulating valve, and exhaust fan. In the lower circulation unit, the wind from the circulating fan first enters the upper cavity, is heated downward by the heat exchanger, passes through the material layer and enters the lower cavity. The lower cavity is connected with the fan by the side air duct and the return air pipe, and most of the air is circulated. Part of it is discharged. The upper and lower circulation units can be flexibly equipped according to user needs, and the number of units can also be selected according to needs.
It is used to dehydrate vegetables. Generally, three equipments are used in series to form the initial drying section, the middle section and the final drying section. In the initial drying section, due to the high water content of the material. Poor air permeability, so a smaller paving thickness, faster running speed and higher drying temperature are used. In the initial drying section, the temperature of the drying gas can be as high as 120oC. The material residence time in the final drying section is 3-6 times that of the initial drying section, and the paving thickness is 2-4 times that of the initial drying section. For the requirement that the temperature of the material does not exceed 60oC, a dry gas of about 80oC can be used. The use of multi-stage combination can better exert the performance of the belt dryer, and the drying is more uniform.