How the belt dryer works

The material is evenly spread on the mesh belt by the feeder, and the mesh belt is made of 12-60 mesh stainless steel wire mesh. Drag by the actuator to move inside the dryer. The dryer consists of several units, each unit is independently circulated by hot air. Part of the exhaust gas is discharged by a special exhaust fan. The exhaust gas is controlled by a regulating valve. The hot air is passed from bottom to top or from top to bottom through the material laid on the mesh belt. Dry and take away moisture. The mesh belt moves slowly, the running speed can be adjusted freely according to the material temperature, 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 laid on the mesh belt by the feeder. The mesh belt is generally made of 12-60 mesh stainless steel wire mesh, and is moved by the transmission device in the dryer. The dryer consists of several units, each of which is independently circulated by hot air. Some of the exhaust gas is discharged by a special exhaust fan 4, and the amount of exhaust gas emitted by each unit is controlled by a regulating valve. In the upper circulation unit, the wind from the circulation fan 5 enters the lower chamber of the unit by the side air passage, and the air flow is heated upward by the heater 7, and after being distributed by the distributor 6, the jet is blown toward the mesh belt, and then passes through the material and enters the upper portion. Cavity. The drying process is a process in which the hot gas flows through the material layer to complete the heat and mass transfer, and the upper chamber is connected to the fan inlet by the air duct. Most of the gas circulation, a part of the gas with a lower temperature and a larger moisture content is discharged as exhaust gas through the exhaust pipe, the regulating valve, and the exhaust fan. In the lower circulation unit, the wind from the circulating fan first enters the upper chamber, is heated downward through the heat exchanger, passes through the material layer and enters the lower chamber, and the lower chamber is connected to the fan by the side air duct and the return air duct, and most of the gas 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.

[1] It is used for dehydrating vegetables, generally using three sets of equipment in series to form the initial dry section, the middle section and the final section. In the initial dry section, the moisture content of the material is high. Poor gas permeability, so the use of smaller paving thickness, faster running speed and higher drying temperature. In the initial dry section, the drying gas temperature can be as high as 120oC or more. The residence time of the material in the final dry section is 3-6 times of that of the initial dry section, and the thickness of the paving is 2-4 times of the initial dry section. For the material temperature not exceeding 60oC, a drying gas of about 80oC can be used. The multi-stage combination can better exert the performance of the belt dryer and the drying is more uniform.