Silica dryer

NegotiableUpdate on 05/19

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Overview

Silica dryer

Product Details

White carbon black is the general term of white powder X-ray amorphous silicic acid and silicate products, mainly referring to precipitated silica, fumed silica, ultra-fine silica gel and aerogel, as well as powder synthetic aluminum silicate and calcium silicate. White carbon black is a porous substance, and its composition can be represented by SiO2 · nH2O, where nH2O exists in the form of surface hydroxyl groups. Soluble in caustic soda and hydrofluoric acid, insoluble in water, solvents, and acids (except hydrofluoric acid). Resistant to high temperatures, non flammable, odorless, tasteless, and has good electrical insulation properties.

According to different material parameters and customer requirements, white carbon black can be flexibly dried using several different drying equipment. We recommend the most commonly used equipment by customers, which is a white carbon black special flash dryer.

Next, let's introduce the principle of this device.

The clean air heated by the heat exchanger is blown into the air inlet and spun into the annular gap at the bottom of the drying chamber at a suitable speed. It then enters the drying chamber in a tangential direction and rises in a spiral shape. At the same time, the material is quantitatively added to the tower by a continuously variable speed feeder. In the drying tower, the material undergoes sufficient and efficient mass heat conversion with hot air. The dried powdered material is transported to the separator along with the hot air, where the finished product is collected and packaged, while the exhaust gas is further processed by the dust removal device and discharged.

At the bottom of the drying tower, there is a snail shell type air distributor and agitator, and the speed of the agitator is infinitely regulated by adjusting the speed of the external motor. The agitator has two functions: it can drive the hot air entering the drying chamber from the distribution chamber to generate a high-speed rotating airflow, thereby forming a stable fluidized bed layer and avoiding unstable fluidization such as jetting and surging caused by local blockage; Secondly, due to the high-speed rotation of multiple sets of blades on the mixer, large pieces of material are continuously crushed, causing the particles that are dry on the outside and wet on the inside to be constantly wrapped, peeled off, and crushed. The surface is constantly updated, increasing the heat exchange area and strengthening the mass and heat exchange, thus improving the drying rate. In addition, the gap between the blades on the mixer and the wall of the drying tower is extremely small, and the materials adhered to the wall should be cleaned up in a timely manner to prevent the materials from staying for a long time and deforming. To ensure the invariant decomposition of materials, a cooling jacket is installed inside the tower wall, which can guarantee the quality of thermosensitive materials. The volute shaped air distributor ensures that the tangential hot air uniformly passes through the bottom annular gap and rises in a spiral shape. The reasonable annular gap wind speed ensures good fluidization and drying of the material
In the middle of the drying tower, a continuously variable speed quantitative feeder continuously adds materials. At the same time, the material is crushed by the bottom mixer and then blown up by high-speed rotating hot air, forming a relatively stable fluidized layer in the drying chamber. There is a rapid and sufficient exchange of heat and moisture between materials and hot air, with most of the water evaporating during this process. Material particles with high moisture content and smaller surface area settle in the drying chamber due to their gravity being greater than buoyancy. During the sinking process, they continuously dry and move to the bottom, where they are further crushed and dried by the blades and the impact of high-speed airflow. At this point, their gravity is less than buoyancy, and the particles begin to rise. At the upper part of the drying chamber, there is a circular baffle, also known as a classifier. The material is carried up by the rotating airflow. Due to centrifugal force, large blocks of material that do not meet the moisture requirements (i.e. have a higher specific gravity) are subjected to centrifugal force, and their rotation radius increases. When their rotation radius is greater than the radius of the classifier, they are blocked in the drying chamber for further drying and crushing until they meet the requirements before overflowing. The finer crushed material is dried in the middle of the drying chamber and then carried up by the airflow. Due to its small particle size and meeting the moisture requirements (i.e. low specific gravity), the centrifugal force is relatively small, and its rotation radius is smaller than the classifier radius. It is then discharged with the airflow and sent to the collection device.