As the core equipment for drying high humidity materials in industries such as chemical, pharmaceutical, and food, the rotary flash dryer has become the preferred choice for many enterprises to optimize production due to its "continuous and efficient" process flow. Recently, the company has publicly disclosed in detail the core process flow of its equipment, including the design of the entire process from material entry to finished product output, highlighting its dual guarantee of drying efficiency and material quality.
1、 Preprocessing: precise feeding, adaptable to different material forms
The starting point of the process focuses on "material adaptability". For high humidity materials such as paste like, filter cake like, and block like materials (usually with a water content of 30% -80%), the equipment is equipped with customized pre-treatment and feeding systems:
•Crushing pretreatment (optional)For bulk or severely agglomerated materials, they can be initially dispersed by a pre crushing device to avoid blockage of the feeding channel by bulk materials and ensure uniform drying in the subsequent process;
•Spiral quantitative feedingAdopting a variable frequency controlled spiral feeder, the feeding speed is precisely adjusted according to the processing capacity of the drying chamber (capable of achieving 0.5-5t/h continuous feeding), to prevent fluctuations in drying efficiency caused by material accumulation or insufficient feeding;
•Sealed feed designThe feed inlet adopts a double sealed structure, which not only isolates external air from entering the drying chamber and affecting the stability of hot air, but also avoids the leakage of material dust, meeting the hygiene requirements of the food and pharmaceutical industries.
2、 Core drying: Four step collaboration to achieve "flash evaporation stage" efficient drying
After entering the drying room, the material is dried in a very short time through a four step collaborative process of "crushing wind field mixing heat transfer drying classification separation", which is also the core technology of the equipment:
•High speed crushing and dispersionThe stirring device at the bottom of the drying chamber (with a speed of 800-3000rpm) drives the blades to rotate, quickly crushing the incoming wet material into small particles, increasing the contact area between the material and the hot air, and laying the foundation for efficient heat transfer;
•Rotating wind field mixingHigh temperature hot air at 400-600 ℃ enters from the bottom of the drying chamber through a tangent line, and is driven by a stirring device to form a strong rotating wind field. The material particles move up in a spiral with the airflow, achieving uniform contact between the hot air and the material in multiple directions;
•Instantaneous heat transfer dryingIn a rotating wind field, hot air comes into contact with material particles in parallel, and through a dual heat transfer method of convection and conduction, the moisture in the material evaporates rapidly within 5-60 seconds (with an evaporation capacity of 50-2000kg H ₂ O/h), achieving the effect of "flash drying";
•Dynamic hierarchical separationThe classifier at the top of the drying chamber screens the rising material particles according to the preset particle size (80-325 mesh) - the dried finished products that meet the particle size requirements enter the subsequent collection system with the airflow, withoutcompletelyDry or oversized particles will fall back to the bottom of the drying chamber under the action of gravity, and participate in the crushing and drying process again to ensure stable moisture content of the finished product (usually controlled at 0.5% -5%).
3、 Post processing: Efficient collection and exhaust purification, balancing environmental protection and quality
The end of the drying process is designed around "finished product recycling" and "environmental emissions" to form a complete closed loop:
•Finished product collectionDry materials that meet the requirements enter the cyclone separator with the airflow, and most of the finished products are separated and collected here; A small amount of fine dust is further intercepted by a bag filter, with a total recovery rate of over 99%, reducing material loss;
•Exhaust gas purificationAfter dust removal treatment, the exhaust gas is further treated with activated carbon adsorption or water spray device to remove odors and residual dust. The final exhaust emission concentration is less than 50mg/m ³, which meets national environmental protection standards;
•Parameter monitoringThe entire process is equipped with temperature, pressure, and flow sensors to monitor key parameters such as feed rate, hot air temperature, and exhaust humidity in real-time. These parameters can be automatically adjusted through a PLC control system to ensure process stability.