Vacuum rake dryer equipment improvement
Conventional vacuum rake dryer structure exists many problems in general, shaft and tine heating has no internal structure. Some although adopted hollow shaft and the hollow tine, but due to fluid flow channel structure design is unreasonable, drying efficiency is low, directly restricts the equipment scale, large scale; Secondly, using simple packing seal structure will seriously affect the quality of the product. To solve these problems, through the experimental research, our technical staff developed structure and excellent performance of new high-effective vacuum rake dryer, its technology has reached the contemporary international advanced level. New research and development of vacuum rake dryer mainly includes baffle type jacket, special flow type hot shaft and new type sealing structure.
Baffle type jacket
Vacuum rake dryer mainly applied in low temperature drying, heating medium is mainly used for hot water. Hot water bubbled into regular vacuum rake dryer jacket, if the velocity is too small, easy to form a "short circuit" phenomenon inside the jacket, cause uneven heating jacket; If flow rate is too big, although can reduce the production of "short circuit" phenomenon, but increased the heat pump power consumption, at the same time also more strict with hot water circulation loop seal. Adopt baffle type jacket structure, the hot water from the entrance into the jacket, due to the fixed flow channel, so regardless of the flow velocity of hot water, hot water can flow through each parts of the jacket, jacket uniform heating; At the same time, also increased the effect of turbulence in the hot water, improve the heat transfer efficiency.
Special flow type hot shaft
The axis of the new type vacuum rake dryer and tine are hollow can pass into the heating medium, its surface can be used as a heat transfer surface, therefore, shaft and tine collectively known as hot shaft (also called a stirring shaft).
For large vacuum rake dryer, hot shaft heat transfer area accounted for more than 60% of the total heat transfer area, its heat transfer effect directly affects the drying efficiency of dryer. In order to improve the effect of heat transfer of thermal shaft, designed a special hot medium in hot shaft passage, thus greatly enhanced heat transfer.
New type sealing structure
Packing seal with heat, pressure, simple structure, reliable sealing, economic, easy to maintenance etc, and as a result, many dynamic seal adopts packing seal. But in vacuum rake dryer, separate packing seal is easy to cause the drying material mix the foreign body contamination, therefore between the end cover and hot shaft developed a new type of double sealing structure, avoids foreign bodies fall into the material, but also solves the material leakage.