Design of airflow and single layer fluidized bed drying materials

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The fluid flows upwards through a fine particle bed (tower), and when the flow rate is low, the fluid only passes through the gaps between the still particles, and the bed at this time is called a fixed bed; As the flow velocity increases, the particles leave each other, and a small number of particles can be seen vibrating and swimming in a certain interval, which is called the expansion bed; The velocity is then increased so that all the particles are just suspended in the upward-flowing gas or liquid, and the bed is the starting point of the fluidized bed.

To put it simply, the phenomenon that solid particles exhibit a similar fluid state under the action of a fluid is called fluidization. The fluidized bed is the equipment where fluidization occurs.

Fluidized bed drying is to fill the material particles to be dried into the fluidized bed, and then pass into the hot air flow to form a fluidized state, at this time, due to the particles dispersed and irregular movement, the degree of fluid turbulence is intensified, resulting in a good contact between the gas and the solid, accelerating the mass and heat transfer between the gas and solid phase, and the bed temperature is uniform, there is no local overheating, the equipment structure is simple and compact, continuous operation.

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Summary. Pro, when the fluidized bed is drying, the reason for the decrease of the hot air flow rate: the hot air temperature is too low, which prolongs the drying time of the material, and the wet material in the dryer is too much, and the hot air flow rate does not increase, resulting in a dead bed. Solution: Appropriately increase the temperature of the hot air.

The reason for the decrease in the flow of hot air when the fluid bed is drying.

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The reason for the decrease in the flow rate of hot air when the flow is dry and the reflux bed is dry: the temperature of the hot air is too low, which prolongs the drying time of the material, and there is too much wet material in the dryer, and the hot air flow rate does not increase, resulting in a dead bed. Solution: Appropriately increase the temperature of the hot air.

Hello dear, The use of multi-layer fluidized bed dryer can increase the drying time of the material, improve the uniformity of the moisture content of the dried product, so that it is easy to control the drying quality of the product. However, due to the increase in the number of layers in the multi-layer fluidized bed dryer, the distribution plate increases correspondingly, and the bed resistance increases. At the same time, between the layers of Haowu, the material should be quantitatively transferred from the upper layer to the lower layer, and the overflow device must be used to ensure the formation of a stable fluidization state, which increases the complexity of the equipment structure.

For materials that remove bound moisture, a multi-layer fluidized bed is appropriate. For example, a double-layer fluidized bed is used to dry aminospirin with a moisture content of 15% and 30%; The use of five-layer fluidized bed drying polyester resin to achieve a moisture content of the product is about a successful example.

Hello, I am glad to serve you: why is the wet content of fluidized bed drying feed controlled in a suitable range is that the pressurized gasification of the fixed bed basically has no requirement for moisture, because the bed is high and can be fully dried. The fluidized bed has requirements for the moisture in the coal, and the high moisture of the coal is easy to contain and consume oxygen.

The amount of hot water should be adjustable, so try adjusting it. The fluidized bed dryer is to put liquid materials such as powder granules, pastes (and even suspensions and solutions) on the air flow distribution plate such as perforated plates, and feed the drying medium with considerable speed from the lower part. When the flow rate of the medium is low, the gas flows between the particles of the material, and the whole material layer does not move; As the airflow velocity gradually increases, the material layer begins to expand and the gap between particles increases. Then increase the air velocity, a considerable part of the material is suspended, forming a gas-solid mixed bed, that is, the fluidized bed, because the suspended material in the fluidized bed is very similar to a boiling liquid, so it is also called the boiling bed, and it presents the properties of a fluid in many aspects, for example, there is an obvious upper interface, and remains level; If the air flow rate is increased, almost all the particles are carried away by the air flow, and it becomes gas transportation.

Therefore, the airflow velocity is the most fundamental control factor of the fluidized bed dryer, and the appropriate airflow velocity should be between the beginning of fluidization of the material layer and the removal of the material. Thank you for your trust, the above is my reply, I hope it can help you, I wish you a happy life.

The following statement about the operation of fluidized bed drying and airflow dryers is correct ()aBoth can operate continuously and intermittently;

b.Both of them can only be operated continuously and cannot be operated intermittently;

c.Fluidized bed dryers can only be operated continuously, while airflow dryers can be operated continuously and intermittently;

d.The airflow dryer can only be operated continuously, and the fluidized bed and sensitive dryer can be operated continuously and intermittently.

Correct Answer: An airflow dryer can only operate continuously, whereas a fluidized bed dryer can operate both continuously and intermittently.

1. Simple structure and easy maintenance.

2. Easy to operate and stable in operation.

3. The gas-solid two-phase infiltration is only in uniform contact, with large relative speed, fast heat transfer speed and high thermal efficiency.

4. There are no rotating parts, vibration cong xiangpei moving parts, and the equipment maintenance cost is low.

5. For heat-sensitive materials, a lower temperature can be used for drying, and the particles will not be destroyed.

Fluidized Bed Dryer Fluidization technology originated in 1921. Fluidized local lead bed drying Tongtan good device, also known as boiling bed dryer, fluid drying refers to the drying medium to make solid bridge particles in the fluidized state of the process of drying. Since the invention of fluidization technology, drying has been one of the earliest areas of application.