Working principle of dual axis blade dryer

Working principle of dual axis blade dryerIt mainly consists of a W-shaped shell with a jacket, two hollow propeller shafts, and a transmission device. The shaft end is equipped with a rotary joint for introducing heat medium. The heating medium is steam, hot water, or thermal oil. The heating medium is introduced into the shell jacket and two hollow blade shafts to heat and dry the material through conduction heating. The blade shaft structure varies for different materials.

The dual axis blade dryer is mainly used in processes such as drying, reaction, cooling, crystallization, evaporation, heating and disinfection, low-temperature calcination, etc. It is suitable for drying (cooling) various organic and inorganic materials with stable thermal sensitivity, as well as thermal sensitive materials under vacuum conditions, and can achieve multi use in one machine.

The dual axis blade dryer is a compact and highly efficient indirect heat exchange stirring equipment, mainly composed of an upper cover, a rotating shaft, a shell (including a jacket), a frame, and a driving device. The rotating shaft is the core component of this equipment, consisting of hollow blades and hollow shafts with special flow channels. The main equipment is installed horizontally (or obliquely). The material enters from the front end of the equipment, and the shell and rotating shaft form a small inclination angle with the horizontal plane. The product moves towards the discharge end by its own weight with the rotation of the rotating shaft. At the discharge end, the product flows out of the equipment through the overflow port and enters the next process. Heat is indirectly transferred to the material through the hollow blades of the rotating shaft, the hollow shaft, and the heating or cooling medium inside the shell jacket, thereby achieving the purpose of drying (cooling).

Working principle of dual axis blade dryer

Blade drying (cooling) machines are divided into two types based on the different heat exchange media: steam (saturated steam or superheated steam) type and liquid (hot water, heat transfer oil, heat medium, refrigerant, softened cold water or chilled water) type. They can be operated continuously or intermittently, and the heat exchange medium (steam, heat transfer oil or water) is always separated from the product. According to the number of rotating axes, it is divided into single axis, double axis, and four axis propeller blades. According to different operating pressures, it is divided into vacuum, atmospheric pressure, and positive pressure types.

Product characteristics of dual axis blade dryer:

1. The thermal efficiency is as high as 80-90%. The heat transfer coefficient K is 100-300 Kcai/h.m2 ℃, and the evaporation rate is 10-30 Kcai/h.m2.

2. Can be operated continuously or intermittently; It can be dried under normal pressure, vacuum dried for thermosensitive materials, heated for evaporation, or cooled for crystallization; Can be used as a pre drying for secondary drying. The solvent can be recovered during the drying process.

3. The carriers are diversified, mainly including thermal oil, steam, water, hot air, coolant, etc.

4. The blade structure is special and has a large heating area. Small unit volume and small footprint.

5. The dual axis blade dryer has a large heating area per unit volume. Small unit volume and small footprint.

6. Dual axis blade dryer has a wide range of applications: regardless of organic or inorganic substances; Granular materials, viscous materials, and materials with high or low moisture content can all be dried.