一、Product introduction
  The product can indirectly heat or cool paste, granule, powder and slurry materials, and can complete unit operations such as drying, cooling, heating, sterilization, reaction and low temperature combustion. The special heat transfer disk in the equipment has high heat transfer efficiency and self-cleaning function of heat transfer surface.
二、Working principle
  Hollow disks are densely arranged on the hollow shaft, and the heat medium flows through the disks through the hollow shaft. The heat transfer area per unit effective volume is very large, and the temperature of heat medium ranges from - 40 ℃ to 320 ℃. It can be steam or liquid, such as hot water, heat transfer oil, etc. Indirect conduction heating, without air to take away heat, heat is used to heat materials. The heat loss is only the heat dissipation to the environment through the insulation layer. The shell is provided with a sealed end cover and an upper cover to prevent the leakage of material dust and give full play to the function.
  The heat transfer medium flows through the shell jacket and the hollow stirring shaft through the rotary joint. The hollow stirring shaft has different internal structures according to the type of heat medium to ensure the best heat transfer effect.
三、Performance characteristics
◎Low energy consumption of disc dryer: due to indirect heating, there is no large amount of air to take away heat, and the outer wall of the dryer is equipped with insulation layer. For slurry materials, only 1.2kg steam is needed to evaporate 1kg water.
◎Disk dryer system cost is low: unit effective volume has a huge heat transfer surface, shorten the processing time, equipment size smaller. It greatly reduces the building area and building space.
◎Wide range of materials to be treated: different thermal media can be used to treat heat sensitive materials and materials requiring high temperature treatment. Commonly used media are: steam, heat transfer oil, hot water, cooling water, etc. It can be operated continuously or intermittently, and can be used in many fields.
◎Small environmental pollution: do not use carry air, dust material entrainment is little. The evaporation of solvent is very small, so it is easy to handle. Closed circuit circulation can be used for contaminated materials or solvent recovery.
◎Low operating costs: small wear and tear, low maintenance costs.  
◎Stable operation: due to the effect of the hollow disc, the material particles fully contact with the heat transfer surface. In the axial range, the gradient of temperature, humidity and mixing degree of the material is very small, thus ensuring the stability of the process.
四、Adaptive materials
  Disc dryer has been successfully used in food, chemical, petrochemical, dyestuff, industrial sludge and other fields. The characteristics of heat transfer, cooling and stirring make it possible to complete the following unit operations: combustion (low temperature), cooling, drying (solvent recovery), heating (melting), reaction and sterilization. The hollow disk is also a heat transfer surface, which makes the heat transfer area in unit effective volume increase and shortens the treatment time. Compression expansion mixing function makes the material mix evenly. In the axial region, the gradient of temperature, humidity and mixing degree is very small. The disc dryer with heat transfer oil as heat medium can complete low temperature combustion. For example, calcium sulfate dihydrate (Ca2SO4 · 2H2O) is converted into calcium sulfate hemihydrate (Ca2SO4 · 1 / 22h2o) by combustion. Sodium bicarbonate (NaHCO3) is converted into soda ash (na2hco3) by calcination. The cooling medium, such as water and cooling brine, can be used for cooling. For example, the disc type soda cooler used in soda industry replaces the old air cooling soda cooler, saves energy and tail gas treatment equipment, and reduces the operation cost. Drying, the most important function of the equipment, does not use hot air, so that solvent recovery, energy consumption, environmental control in an ideal state easy to handle. It is especially suitable for solvent recovery, inflammable and oxidizable heat sensitive materials. In the axial region, the uniformity of temperature, humidity and mixing degree makes the equipment available for heating or melting, or for some solid material reactions. It has been successfully used in compound fertilizer and modified starch industry. Disc dryer can be used to sterilize food and flour. The large heating area in the unit effective volume can quickly heat the material to the sterilization temperature, avoiding the change of material quality due to long-time heating.
五、Technical parameters of disc drying equipment