Rotary Freeze Dryer
(a)10 series
Lab Scales Desktop(Freeze-dried material 1.5-2KG)
(b)12 series
Lab Scales Vertical(Freeze-dried material 2KG)
(c)18 series
Scientific Research Scales(Freeze-dried material 3KG)
2.Pilot Freeze Dryer:
0.2m²/0.3m²/0.5m²/1m²/2m²/---Pilot Scales(Freeze-dried material 3KG-20KG)
3.Industrial Freeze Dryer:
5㎡/10㎡/20㎡/30㎡/50㎡/100㎡/200㎡/300㎡(Freeze-dried Weight 5T~60T)
4.Customization: set up the specifications you need
(a)Freeze-dried Area
(b)Freeze-dried Weight
(c)Freeze-dried Material
(d)Interlayer Quantity/Size
(e)Cold Trap Temperature
Description
Technical Parameters
Rotary freeze dryer is an advanced drying equipment widely used in fields such as pharmaceuticals, chemicals, biotechnology, etc. It achieves efficient and uniform drying of materials through low-temperature freezing and vacuum environment, combined with rotational motion. The advantage lies not only in its efficient drying ability, but also in its protection of the original structure and activity of the material.
During the drying process, the active ingredients in the material are fully retained, ensuring the quality and stability of the product. In addition, the rotating freeze-drying machine greatly improves drying efficiency, reduces energy consumption and environmental pollution, and provides strong support for the sustainable development of enterprises through optimized design and precise control.
Rotary freeze-dryer is a kind of efficient, stable and reliable drying equipment, which has a wide application prospect in food processing, pharmaceutical manufacturing and biological products. In the process of use, it is necessary to pay attention to the operation specifications and maintenance work to ensure the normal operation of the equipment and the stability of product quality.
We provide Rotary freeze dryer, please refer to the following website for detailed specifications and product information.
Product: https://www.achievechem.com/freeze-dryer/rotary-freeze-dryer.html
Product Structure & Model
10 Series Laboratory Freeze Dryer
12 Series Laboratory Freeze Dryer
18 Series Laboratory Freeze Dryer
Electric Heating
Silicone oil heating
Products Structure
Technical advantages
The technical advantages of rotary freeze dryers are mainly reflected in the following aspects:
Low-temperature drying has significant advantages: Drying in a low-temperature environment can effectively prevent substances such as proteins and microorganisms from denaturating or losing their biological activity. It is particularly suitable for the drying and preservation of heat-sensitive substances such as vaccines, fungi, strains, and blood products. The low-temperature drying characteristic minimizes the loss of volatile components and heat-denatured nutrients in substances, making it a commonly used drying method in the fields of chemicals, pharmaceuticals, and food.
Inhibiting microbial and enzyme activity: The low-temperature drying process can significantly reduce the metabolic activity of microorganisms and the catalytic action of enzymes, effectively maintaining the original properties of substances. This characteristic is crucial for maintaining the activity and function of biological products and ensuring their stability during storage and transportation.
Maintain the form and rehydration characteristics of the substance: After drying, the volume and shape of the substance remain basically unchanged, presenting a spongy and loose structure, with no obvious dry shrinkage phenomenon. This structure enables substances to have an extremely large contact area with water during rehydration, allowing them to quickly absorb moisture and return to their original state. It is particularly suitable for fields such as food and biological products where the original form and texture need to be maintained.
Antioxidant and low moisture residue: The vacuum drying environment can effectively isolate oxygen, significantly slow down the oxidation reaction of substances, and extend the storage period. Meanwhile, this equipment has a powerful water removal capacity, capable of removing 95% to 99% of water, reducing the possibility of chemical reactions of substances, the growth and reproduction of microorganisms, and physical changes, thereby significantly extending the shelf life of the products.
High-efficiency thermal energy utilization: Materials are dried in a frozen state at a low temperature, and the temperature requirement for the heat source is not high. Normal temperature or low-temperature heaters can meet the demand. If the freezing chamber and the drying chamber are separated, the drying chamber does not need insulation, the heat loss is small, and the thermal energy utilization efficiency is high.
Operation process
The working process of a freeze dryer is a complex and delicate operation process that combines low-temperature freezing, vacuum environment, and rotary motion to achieve efficient and uniform drying of materials. The following is its detailed work process:
Pre cooling stage: Before starting freeze-drying, pre cooling treatment is carried out first. The purpose of this step is to lower the temperature of the material, bring it close to the freezing point, and prepare for the subsequent freezing process. Pre cooling helps to reduce the thermal stress inside the material during the freezing process, protecting its original structure and activity.
Freezing stage: During the freezing stage, the material is rapidly cooled to below freezing point. The rotating freeze-drying machine utilizes an efficient refrigeration system to quickly condense the moisture inside the material into ice crystals. This step ensures that the moisture in the material is effectively fixed, laying the foundation for the subsequent sublimation process.
Vacuum and sublimation stage: After freezing is completed, the rotary freeze-drying machine enters the vacuum environment. Under vacuum conditions, ice crystals can directly sublime into water vapor, thereby avoiding problems such as material deformation and discoloration that may occur during traditional drying processes.
During the sublimation process, the heating system provides necessary heat to promote the sublimation of ice crystals. At the same time, the rotational motion causes the material to continuously roll and move in the drying chamber, ensuring that all parts of the material can be uniformly heated, achieving efficient and uniform drying.
Collection and discharge: The water vapor generated by sublimation is captured by the collection system and discharged into the drying chamber through a dehumidification pipeline. This step ensures the stability of the dry indoor environment and also avoids secondary pollution of materials caused by water vapor.
End and retrieval: When the material reaches the required drying degree, the rotary freeze-drying machine stops working. The operator can open the drying room and remove the dried material.
Induced draft fan-One of the key components
Function and function
Introduction of fresh air
During the drying process, the induced draft fan is responsible for introducing fresh air to provide the necessary oxygen and heat transfer medium for the drying chamber.
Discharge of moisture
As the drying process proceeds, the water in the material gradually evaporates into water vapor. The induced draft fan drains this moisture out of the drying chamber to keep the indoor environment dry.
Promote air circulation
The induced draft fan promotes the air circulation in the drying room by generating air flow, so that heat and moisture are more evenly distributed in the material and improve drying efficiency.
Types and characteristics
Centrifugal induced draft fan:
Centrifugal induced draft fan is a common type in rotary freeze-dryer. It has the advantages of simple structure, easy maintenance and low noise. The centrifugal induced draft fan generates centrifugal force by rotating the blades to draw air in and out.
Axial induced draft fans:
Axial induced draft fans are also used in rotary freeze-dryers in some specific situations. It mainly uses the rotation of the blade to promote the air flow along the axial direction, and has the characteristics of large flow and small pressure loss.
Selection and configuration
Choose according to the size of the equipment:
The size of the rotary freeze dryer is different, and the type and power of the induced draft fan required are also different. When selecting an induced draft fan, it is necessary to determine the appropriate type and power according to the size and production capacity of the equipment.
Consider noise and energy efficiency:
When choosing an induced draft fan, you need to consider its noise and energy efficiency levels. Low noise and high energy efficiency induced draft fan can provide a better working environment and energy saving effect.
Configuration control system:
In order to improve the operating efficiency and stability of the induced draft fan, the corresponding control system can be configured. The control system can automatically adjust the speed and power of the induced draft fan according to the temperature and humidity of the drying room, so as to achieve more accurate control.
Care and maintenance
Regular cleaning
The induced draft fan is easy to accumulate dust and dirt during operation, so it is necessary to clean its blades and housing regularly. When cleaning, you can use tools such as a soft brush or hair dryer to avoid scratching the surface with hard objects.
Check bearings and lubrication
The bearings of the induced draft fan need to be checked and lubricated regularly. If the bearing is found to be worn or poorly lubricated, it should be replaced or lubricant added in time.
Check the electrical system
The electrical system of the induced draft fan also needs to be checked regularly. Check the connection and insulation performance of wires, cables, motors and other components. If an exception is found, handle it in time.
Compressor failure and solution
► Compressor fault types and possible causes
1) Compressor noise is too high
Possible causes:
Suction air: The compressor suction port is not tightly sealed, causing air to enter.
Insufficient lubricating oil: The amount of lubricating oil inside the compressor is insufficient, resulting in increased friction.
Movement wear: The compressor movement parts wear seriously, resulting in uneven operation.
2) Compressor fails to start
Possible causes:
Electrical failure: The power supply is not connected, the cable is loose, and the circuit is faulty.
Mechanical fault: The internal mechanical parts of the compressor are damaged or stuck.
Control fault: The compressor cannot be started because the control system is faulty.
2) Compressor overload protection action
Possible causes:
Abnormal voltage: The compressor is overloaded due to high or low voltage.
Excessive exhaust pressure: The exhaust pressure of the cooling system exceeds the capacity of the compressor.
Winding short circuit: The compressor winding has a short circuit fault.
► Troubleshooting method of compressor faults
1) Compressor noise is too high
Treatment method:
Check whether the compressor suction port is sealed. If leakage occurs, replace the seal or tighten the suction port screws.
Check the amount of lubricating oil inside the compressor, if insufficient, should add an appropriate amount of lubricating oil.
Remove the compressor and check the wear of the movement parts. If serious wear occurs, replace the worn parts.
2) Compressor fails to start
Treatment method:
Check whether the power supply is connected and whether the cable is firmly connected. If it is loose, reconnect the cable and tighten it.
Check whether the circuit is normal, if there is a fault, repair or replace the damaged electrical components.
Check whether the mechanical parts inside the compressor are damaged or stuck. If they are damaged, replace the damaged parts. If stuck, clean the stuck foreign matter and reassemble it.
3) Compressor overload protection action
Treatment method:
Check whether the power supply voltage is stable. If any abnormality occurs, adjust the voltage to the normal range.
Check whether the exhaust pressure of the refrigeration system is too high. If it is too high, check and clean the exhaust pipe and condenser.
Check whether the winding of the compressor is short circuit, if there is a short circuit, the winding or the entire compressor should be replaced.
Conclusion
During the operation of a rotary freeze-drying machine, the two core processes of freezing and sublimation are intertwined, jointly driving the smooth progress of the drying process.
In the freezing stage, the material is rapidly cooled below the freezing point, and the moisture inside quickly condenses into ice crystals under the action of low temperature. This step not only ensures that the moisture in the material is effectively fixed, but also lays a solid foundation for the subsequent sublimation process.
Next, the rotary freeze dryer enters the vacuum environment and heats the material through a heating device. Under vacuum conditions, ice crystals can directly sublime into water vapor, thereby avoiding problems such as material deformation and discoloration that may occur during traditional drying processes.
Meanwhile, the role of rotational motion cannot be ignored. It allows the material to continuously roll and move in the drying room, ensuring that all parts of the material can be uniformly heated, thereby achieving efficient and uniform drying of the material.
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