Centrifugal air dryer

A conical central column is installed in the circular tube of the centrifugal air dryer. A drying chamber is formed between the tube and the central column, and the air distribution chamber is surrounded by it. The air distribution chamber and the drying chamber are connected through many channels with guide elements. The guide element is installed at a certain distance to make the air flow into the drying chamber in tangent direction.

Centrifugal airflow dryer is a cone-shaped central column arranged in a circular tube, and a drying chamber is formed between the pipe and the central column, and the air distribution chamber is surrounded by the drying chamber. The air distribution chamber and the drying chamber are connected through many channels with guide elements. The guide element is installed at a certain distance to make the air flow into the drying chamber in tangent direction.

The drying medium enters in three ways: one through the annular section at the bottom of the equipment, one through the tangent direction of the gap, and the other through the bottom channel for wet materials.

We know that the residence time of particles in straight tube air flow dryer is determined by tube length, air flow rate and material properties. This kind of drying equipment, also known as rotary flow instantaneous dryer, provides a longer residence time (up to 5 times in the absence of backmixing) in a short tube, because the geometric height is not directly related to the residence time. The wet material enters the rotary flow dryer together with the main hot air flow generated by the common blower heater system. Because the secondary hot air is tangential to the main air flow, the wet material passes through the annular space between the inner cylinder and the drying shell according to the spiral route. The collector at the bottom of the dryer is balanced by counterweight, so that the overweight particles (block material, stone, stray metal, etc.) can be automatically discharged. The hot air enters the main air stream through adjustable vanes placed along the inner cylinder. The secondary flow produces an aerodynamic effect, which enhances the initial spiral flow, and also produces a thermal effect, which compensates for the loss of drying capacity of the main stream when it becomes cold due to wet evaporation.

Rotary flow dryers can be used to process granular non adhesive products such as aluminum silicate, copper powder, pyrite, charcoal, granular rubber, chopped straw, detergents and similar materials.

This dryer can effectively remove the surface moisture and part of the bound moisture contained in the granular materials. The airflow carrying wet materials enters the spiral channel of drying chamber along the tangent direction, makes spiral movement around the center, and then transits to the vortex chamber. Here, the large particles move along the periphery, and the new materials constantly squeeze the particles which circulate in the inner layer, and are captured by the gas. When the regulating valve is opened, the material is taken out of the vortex chamber and into the separator for gas-solid separation. The regulating valve is used to adjust the residence time of materials in the vortex chamber, ranging from 10 seconds to 2 minutes.