Rotary flash dryer is an efficient drying equipment that integrates drying technology and fluidization technology. This device overcomes the disadvantages of high energy consumption and uneven fluidized bed drying of traditional drying equipment, and combines the characteristics of high efficiency, energy saving, and speed. It has become an ideal choice for processing high viscosity and heat sensitive materials in industries such as chemical, pharmaceutical, and food.
Spin Flash DryerWorking principle and technical characteristics
The working principle of the rotary flash dryer is based on the combination technology of fluidized bed drying and air flow drying. During work, hot air enters the mixing, crushing, and drying chamber through the bottom annular gap tangent line, forming a spiral upward airflow; Wet materials are continuously and quantitatively added to the dryer through a spiral feeder, and are crushed and dispersed under the impact of high-speed rotating hot air flow and the shearing action of a mechanical stirrer. This process significantly increases the specific surface area of the material, strengthens the heat and mass transfer process, and greatly improves the drying efficiency.
This device has several outstanding technical features:
Efficient and energy-saving: Materials are subjected to multiple effects such as centrifugation, shearing, collision, friction, etc., presenting a highly dispersed state, with high relative velocity between gas and solid, and high evaporation intensity.
Multi functional integration: It can simultaneously complete crushing, dispersion, drying, and grading processing, achieving multiple uses for one machine.
Anti sticking wall design: The rotating airflow has a strong scouring effect on the wall material, effectively eliminating the phenomenon of sticking to the wall.
• Precise control: The particle size and humidity of the exported materials can be accurately controlled through the classifier to ensure product quality.
• Safety and environmental protection: Micro negative pressure operation prevents dust leakage, equipped with explosion-proof devices to ensure safe handling of heat sensitive materials.
Equipment structure and key components
The rotary flash dryer is mainly composed of the following core components
Hot air system: including air filter, blower, and heater. After being filtered and purified, the air is heated and enters the drying chamber in a tangential direction through a specially designed annular hot air distributor, forming a rotating wind field.
Drying chamber: designed with an inverted cone structure and equipped with a stirrer inside. The conical structure helps to form a stable fluidized bed layer while promoting material circulation. The upper part of the drying chamber is equipped with a classifier, which can control the particle size of the finished product.
Feeding system: spiral feeders, vibrating feeders, etc. are designed for different material characteristics to ensure that paste like and filter cake like materials can be uniformly and continuously added to the drying chamber.
Dust removal system: Usually a combination of cyclone separator and bag filter is used to efficiently collect fine particles after drying, and the purified exhaust gas is discharged through the induced draft fan.
Application Fields and Typical Materials
The rotary flash dryer has been widely used in multiple industrial fields due to its advantages.
Chemical industry: particularly suitable for drying chemical products such as bleaching powder concentrate and ammonium fluoride. After the ammonium fluoride material is dried by this equipment, the moisture content can be reduced from its initial state to below 0.5%.
Carbon black and pigments: They exhibit excellent drying properties for powdered materials such as carbon black, and accelerate heat and mass transfer processes by increasing the surface area per unit volume of wet material.
Pharmaceutical and Food: Suitable for mild drying of thermosensitive materials, the design of the bottom high-temperature zone avoids direct contact between the material and the hot surface, solving the problem of coking discoloration.
• Other fields: Outstanding performance in drying high viscosity and high consistency paste like materials in industries such as petroleum, chemical fiber, mining, coatings, dyes, and intermediates.