Tumble Dryer

Tumble Dryer Introduction

The wet material is conveyed to the hopper by a belt conveyor or a bucket elevator, and then it is fed into the feeding end through the feeding pipeline by the hopper feeder. The slope of the feeding pipeline must be greater than the natural angle of repose of the material to ensure smooth flow into the dryer. The dryer is a rotating cylindrical drum slightly inclined from the horizontal line. Material is added from the higher end, and the heat carrier flows in parallel with the material into the drum. As the drum rotates, the material is moved by gravity to the lower end. During the forward movement of the wet material within the drum, it receives heat directly or indirectly from the heat carrier, allowing it to dry. Then, it is discharged at the outlet end via a belt conveyor or a screw conveyor. Scrapers are installed on the inner wall of the drum, which function to lift and scatter the material, increasing the contact surface with the airflow to enhance the drying rate and promote material movement. The heat carrier is typically divided into hot air, flue gas, etc. After passing through the dryer, it generally requires a cyclone separator to collect the material carried by the gas. To further reduce the dust content in the exhaust gas, it should be passed through a bag filter or a wet scrubber before being released.

Features of the rotary dryer

High overload capacity, great processing ability, low fuel consumption, and low drying cost.

2. Utilizing a downstream drying method, flue gas and wet material enter the dryer from the same side, allowing for a high evaporation intensity by utilizing the high-temperature flue gas, with a low exit temperature from the dryer.

3. Utilizing a discharging device, feeding device, discharge device, and cyclone dust removal device, we have effectively eliminated issues such as feed blockage, inconsistency, unevenness, and backflow in the dryer, thereby reducing the load on the dust removal system.

4. The dryer features a "centering roller bearing unit," ensuring the roller and ring always maintain linear contact, thereby significantly reducing wear and power loss.

5. Open gear drive system features include a reasonable structure, easy operation, long service life, and convenient maintenance.

During the drying production process, the majority of operations are in a downstream manner, characterized by:

1. At the hot end of the dryer, there is a significant temperature difference between the material and the hot gas, allowing for a rapid heat exchange process. This leads to the easy evaporation of a large amount of moisture, making it suitable for materials with a high initial moisture content.

2. After sticky materials enter the dryer, due to the ease of evaporation of surface moisture, adhesion can be reduced, which is beneficial for material movement. When used to dry wet coal, it can prevent direct contact of high-temperature gases with dry coal, thus avoiding ignition.

3. The hot-end negative pressure in the downstream operation is low, which can reduce the air leakage into the drying process, thereby stabilizing the temperature and flow rate of the hot gas inside the dryer.

4. The feeding and coal supply are located at the hot end of the dryer, making the workshop layout more convenient.

5. The dryer for downstream operation has a low discharge temperature, which is usually conveyed by a belt conveyor.

Revolving Dryer Technical Specifications

Indirect Heat Transfer Dryer