China Rotary Dryer Machine - Reliable Suppliers & Factory for Rotary Drum Drying Equipment
Working principle
The wet materials are sent to the hopper by a belt conveyor or bucket elevator, and then enter the feeding end through the feeding pipe of the feeding machine of the hopper. The inclination of the feeding pipe should be greater than the natural inclination of materials to facilitate materials to flow into the dryer smoothly. The dryer cylinder is a rotating cylinder which is slightly inclined with the horizontal line. Materials are fed in through the higher end, and heat carrier enters through the lower end contacting with materials in counter-flow. Sometimes the heat carrier and materials flow into the cylinder together. As the cylinder rotates, the materials move to the lower end due to gravity. When the wet materials move forward in the barrel, they receive the heat from the heat carrier directly or indirectly, and the wet materials dry. Then, the wet materials are sent out through the discharge end through a belt conveyor or screw conveyor. The inner wall of the barrel is equipped with a lifting flight, which can lift the materials and scatter them, increases the contact surface of the materials and the airflow, in order to improve the drying rate and forward the materials advancement.
1. Material Feeding
Wet materials enter the inclined rotating cylinder smoothly from the hopper via a belt conveyor or bucket elevator.
2. Heat Exchange
Materials contact the heat carrier in counter-flow or co-flow, absorbing heat directly or indirectly to evaporate moisture.
3. Lifting & Scattering
Internal lifting flights lift and scatter materials to maximize contact with the hot airflow and enhance drying efficiency.
4. Discharge
The fully dried materials move to the lower end by gravity and are discharged via a belt or screw conveyor.
Frequently Asked Questions
How are wet materials conveyed into the rotary dryer?
Wet materials are transported to the hopper via a belt conveyor or bucket elevator, and then flow into the dryer cylinder through the feeding pipe of the feeding machine.
Why is the dryer cylinder slightly inclined?
The cylinder is inclined with the horizontal line so that materials fed from the higher end can move toward the lower discharge end naturally under the influence of gravity as the cylinder rotates.
What is the flow direction of the heat carrier and materials?
Typically, the heat carrier enters from the lower end to contact the materials in a counter-flow direction. However, in some processes, the heat carrier and materials can also flow into the cylinder together in a co-flow direction.
What role do the lifting flights play inside the dryer?
The lifting flights on the inner wall lift and scatter the materials. This increases the contact surface area between the materials and the hot airflow, significantly improving the drying rate and assisting in moving the materials forward.
How are the dried materials discharged from the system?
Once the materials reach the lower end of the cylinder and are fully dried, they are discharged and transported away using a belt conveyor or a screw conveyor.