What is Fluidized Bed dryers?

Fluidized Bed Type drying machine, also known as Fluidized Bed Drying Machine, is a kind of drying machine with fluid agitation and special forms of steel making equipment.

Fluidized Bed Drying Machine is a kind of stirring type drying machine with special forms, such as fluid agitation.
The drying speed of Fluidized Bed Dryers is very fast. The temperature in the fluidized bed is uniform and easy to control and adjust, and the time is easy to choose. Therefore, the drying material with extremely low water content can be obtained.
Fluidized Bed Drying Equipment has three categories: continuous, semi-continuous, and intermittent production. According to the structure, there are multiple forms, such as single-layer, multi-layer, horizontal multi-chamber pulse, cone and spray, vibration and inertia carrier. When ammonium oxide is dried with this dryer, the bed height is 300 ~ 400mm, air speed 1.2tn/s, intake temperature 150 ~ 1601, exhaust temperature 50-60, negative pressure operation, material granularity 250 ~ 420, staying in the machine for 120 s.

Fluidized Bed Drying Machine is a kind of granular powder, shaped (even suspension and solution) and other liquidity materials placed on the porous plate and other air distribution board, from its bottom into a dry medium with a considerable speed. When the medium flow rate is low, the gas flows through the material particles, and the entire material layer does not move; gradually increases the airflow speed, the material layer begins to expand, the gap between particles increases; then increases the airflow speed, A considerable amount of materials are suspended to form a gas-solid mixed bed, I .e., a fluidized bed. Because the suspension of materials in a fluidized bed is like a boiling liquid, it is also called a boiling bed, in addition, it presents the fluid properties in many aspects, such as a clear interface, and maintain the level; if the flow rate is increased, almost all the particles are taken away by the airflow, it becomes a gas transport. Therefore, the airflow speed is the most fundamental control factor of the fluidized bed dryer. The appropriate airflow speed should be between making the material layer flow and bringing the material out.

The heat transfer of fluidized bed can pass through the outer jacket or in-bed heat exchanger. When a bed heat exchanger is used, in addition to the requirements of the general heat exchanger, the impact on the Material Flow in the bed must also be taken into account, that is, the form and installation method of heat exchanger should be as beneficial as possible to the normal flow of fluid. Practice has proved that when a tube heat exchanger is used, it is difficult for the tube to be dispersed and streamed in the dry medium flow in the mud paste material with a viscosity of 2/5 and a high moisture content from the center of the equipment. Put some inert carrier (such as Z sand, alumina, wrong oxide ball, granular salt) at the bottom of the dryer, when they flow at a certain flow rate, the wet material will be attached to its surface, and then it will become a dry shell. Due to the collision and friction of the inert carrier, the dry shell may fall off and be taken away by the media stream. The carrier itself is in contact with the new wet material and then forms a dry shell. So that the fine wet adhesive material can be fully dried in the fluidized bed drying machine.

Copyright, If You Need To reprint please indicate http://www.gene8.cn, we provide installment and other more benefits Oh!

 

What is Fluidized Bed dryers?