Granule Drying Mechanism Water Molecule Transfer from Material to Air

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Granule Drying Mechanism Water Molecule Transfer from Material to Air. Knowledge of granulator principles and granulation techniques is essential to optimize product quality and process efficiency. This guide will take an in-depth look at how granulators work, including how high-pressure fans promote pellet flotation and drying and the role of aerosolized binders in pellet formation. We will take a closer look at the mechanism of pellet drying and analyze the transfer of water molecules from the material to the air. Through in-depth explanations, we will help you fully understand the principles of pelletizing machines and enhance your knowledge of pelletizing technology.

Granule Drying Mechanism Water Molecule Transfer from Material to Air

 

Pelletizer Principles and Pelletizing Technology: The Critical Role of High-Pressure Fans in Floatation and Drying

High-pressure fans play a vital role in the granulation process by providing a solid airflow to maintain the suspension of the particles and to facilitate the evaporation of moisture. Pelletizing involves spraying a liquid (usually a binder) into the powder or granular material to form moist agglomerates. These agglomerates are suspended in the air by high-pressure fans and come into contact with hot air, thus drying and forming solid particles. The mechanism of the high-pressure fan is as follows:

  • Particle Floatation: The high-pressure blower blows air at a velocity sufficient to support and float the particles, preventing them from settling or sticking together and ensuring that the particles are evenly suspended in the pelletizing chamber.
  • Moisture evaporation: When hot air comes into contact with the pellets, the heat causes the moisture in the pellets to evaporate. The airflow generated by the high-pressure fan promotes the exchange of heat and mass between the air and the pellets, accelerating the evaporation of moisture.
  • Particle drying: As moisture evaporates, the particles dry and harden. The hot air continuously blown by the high-pressure fan ensures that the surface of the granules is uniformly dried, resulting in the formation of high-quality granules with good physical and chemical properties.

Overall, using high-pressure fans in granulators is the key to floating, drying, and homogenizing the granules. It provides a solid airflow to support the pellets, promotes moisture evaporation, and produces high-quality pellets that meet the required specifications.

 

Granule Drying Mechanism: Water Molecule Transfer from Material to Air

Granule drying is a crucial step in granulation technology. During the drying process, water molecules are transferred from the pellet to the drying air so that the pellet reaches the desired degree of dryness. The core of the drying mechanism is mass transfer, i.e., the evaporation of water molecules from the surface of the pellet and their diffusion into the surrounding air.

The following factors influence the particle drying mechanism:

  • Particle size: Smaller particles have a larger surface area and dry faster.
  • Drying air temperature: The higher the temperature, the lower the moisture saturation in the air and the faster the drying rate.
  • Air Flow Rate: The faster the airflow, the quicker the drying rate.
  • Particle moisture content: the higher the moisture content of the particles, the slower the drying rate.

The drying mechanism can be divided into the following two stages:

  • Constant velocity drying period: In this stage, the drying air conditions affect the water evaporation rate from the particles’ surface.
  • Decreasing drying period: In this stage, water molecules inside the particles gradually spread to the surface and evaporate, and the drying rate decreases with time.

Understanding the granule drying mechanism is essential for optimizing the granulation process. By controlling the drying conditions, companies can realize the best granule drying effect to ensure product quality and production efficiency.

Granule Drying Mechanism: Water Molecule Transfer from Material to Air

Influencing factorsDescription
Particle sizeSmaller particles have a larger surface area and dry faster.
Drying Air TemperatureThe higher the temperature, the lower the moisture saturation in the air and the faster the drying rate.
Air flow rateThe faster the airflow, the quicker the drying rate.
Particle moisture contentThe higher the moisture content, the slower the drying rate.

 

Pelletizer Principle: Air Lifting and Heat Exchange

In the granulation process, airlifting and heat exchange are the most important principles to ensure the uniformity and quality of the granules. The function of airlifting is to utilize the gas flow generated by the high-pressure fan to suspend the pellets in the airflow to maintain the fluidity between them and avoid sticking or settling their pellets. At the same time, the airflow elevation also promotes complete contact between the particles and the hot air, realizing heat exchange.

The high-pressure fan compresses the air in the granulator to form a high-speed airflow. After passing through the pelletizing tower, the air stream contacts the particles and lifts them upwards to the upper part of the pelletizing tower. The particles, driven by the airflow, are suspended in the granulation tower, realizing the floating and flowing state of the particles, preventing the particles from settling or aggregating, and ensuring the uniformity of the particles.

Meanwhile, heat exchange also plays a vital role in the granulation process. When the particles are suspended in the air stream, the particles exchange heat with the hot air, which evaporates the moisture in the particles. The temperature and flow rate of the hot air can be controlled by adjusting the fan’s speed and the pelletizing tower’s temperature. Proper heat exchange conditions can ensure uniform drying of the pellets and avoid over-drying or over-wetting, which may affect the quality and stability of the pellets.

Therefore, airlifting and heat exchange are inseparable in a granulator, and together, they achieve uniform floating, heat exchange, and drying of the pellets, ensuring the quality and stability of the pellets to meet the requirements of different applications.

 

Pelletizer Principle: Granule Floating and Drying

During the pelletizing process, the floating and drying of the pellets are of paramount importance, affecting the quality and stability of the final pellet. The robust high-pressure fan in the pelletizer plays a crucial role in providing the airflow that suspends the pellets and promotes moisture evaporation.

Floatation of the pellets

  • The airflow generated by the high-pressure fan blows the particles upwards to form a suspension bed.
  • Collisions and friction between the particles generate frictional heat, further promoting water evaporation from the particles’ surface.
  • The suspended state of the pellets is evenly heated, preventing the pellets from sticking or forming clumps.

Particle drying

  • Moisture in the air stream is replaced by moisture on the surface of the particles, forming water vapor.
  • The water vapor is carried out of the pelletizer with the air stream, drying the pellets.
  • The temperature and humidity of the drying air stream can be adjusted to optimize drying speed and pellet quality.
  • Proper drying prevents the pellets from becoming soft due to excessive moisture or brittle due to over-drying.

The high-pressure fan in the pelletizer plays an indispensable role in the floating and drying process of the pellets, ensuring uniform drying and good quality. By adjusting the parameters of the fan, the pelletizing process can be optimized to produce high-quality pellets that meet the specific application’s requirements.

 

Conclusion

In summary, the pelletizer principle and technology allow precise control of every critical aspect of the pelletizing process, ensuring that the final product meets the expected quality and specifications. The granulator principle utilizes a high-pressure blower to keep the powder or granules floating between the drying chamber and the trolley. The hot air passes through the drying chamber from the bottom up and mixes fiercely with the granules. The water molecules move from the high material to the low air, carrying the water away, so the drying efficiency is excellent.

Pelletizing is spraying an atomized binder or main ingredient on the floating powder so that the fine powder can form uniform granules. Mastering the principle of granulator and granulation technology can improve production efficiency and ensure the stability and quality of the products. With the continuous development and innovation of granulation technology, it is expected to be applied in more fields, bringing more possibilities to the industry.

→More detailed information**Single-stage granulation**

 

FAQ

How does the granulator utilize the high-pressure blower to achieve the floating drying effect of the granules?

  • The granulator generates a strong airflow through the high-pressure fan, which makes the pellets float in the drying chamber. Hot air enters the drying chamber from below and mixes intensely with the pellets, causing water molecules to be transferred from the pellets into the air, thus effectively removing water.

What is the role of the aerosol binder in the granulation process?

  • An aerosol binder is a liquid uniformly sprayed on the floating particles. It contains a binder or main ingredient that binds the particles together. By spraying the binder, tiny particles can be formed into homogeneous particles, and the mechanical strength of the particles can be increased.

How does the granule drying mechanism work?

  • The granule drying mechanism is based on transferring moisture from the granule (high humidity) to the air (low humidity). When hot air comes into contact with the particles, the water molecules in the particles evaporate and diffuse into the air. The particles gradually dry to the desired dryness level as the moisture evaporates.
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