The working principle of belt dryer
Drying process is a hot air flow through the material layer, complete the process of heat and mass transfer, the upper cavity connected by the duct and the fan inlet. Most of the gas circulation, part of the lower temperature of the larger moisture content of the gas as exhaust gas through the drainage tube, regulating valve, drain fan discharge. The next cycle of the unit, the fan out of the wind into the upper cavity, down through the heat exchanger heating, through the material layer into the lower chamber, the lower chamber by the side duct and return air duct connected to the fan, most of the gas circulation, Part of the discharge. Up and down the cycle unit according to user needs can be flexible equipment, the number of units can also be selected according to need.
Material from the feeder evenly spread on the mesh belt, mesh with 12-60 mesh stainless steel mesh. Moved by the drive in the dryer. The dryer consists of several units, each unit of hot air independent cycle, part of the exhaust by a special exhaust fan discharge, the exhaust gas from the control valve control, the heat from the bottom up or from top to bottom through the shop in the material on the net, heating Dry and take away moisture. The mesh belt is slowly moving, the running speed can be adjusted according to the material temperature freely, and the dried finished product falls into the feeder continuously. Up and down the cycle unit according to user needs can be flexible equipment, the number of units can be selected according to need.
For the material temperature does not exceed 60oC requirements, can be used about 80oC dry gas. Multi-stage combination can better play the performance of belt dryer, and dry more uniform.
For dehydrated vegetables, the general use of three devices in series, the formation of early dry section, the middle section and the final section. In the early dry section, due to high water content of materials. Poor ventilation, so the use of a smaller thickness of the shop material, faster running speed and higher drying temperature. In the early dry section, the dry gas temperature can be as high as 120oC or more. The length of the material in the final section is 3-6 times of the initial dry section, and the thickness of the material is 2-4 times of the initial dry section.
The material in the hopper is spread evenly by the feeder, and the mesh belt is generally made of 12-60 mesh stainless steel wire and is moved by the transmission in the dryer. The dryer consists of several units, each unit of hot air independent cycle, in which part of the exhaust by the special discharge fan 4 discharge, each unit discharge exhaust gas by the control valve control. In the upper circulation unit, the wind coming out of the circulating fan 5 enters the lower chamber of the unit by the side air duct, the air flow is heated upwardly through the heater 7, and the dispenser 6 is dispensed to form a jet stream into the mesh belt, Cavity.
