High-speed centrifugal spray dryer

I Equipment Overview

High-speed centrifugal spray dryer is a kind of advanced equipment that uses the high-speed rotating centrifugal disk to atomize the liquid material into tiny droplets and quickly complete the drying process in the hot air environment. It is widely used in pharmaceutical, food, chemical, dyestuff, ceramic materials and other industries, and can efficiently convert wet materials into powder or granular products with uniform particles, good solubility and high purity.

II.Working principle

The working principle of the high speed centrifugal spray dryer is based on the action of centrifugal force. The liquid material enters the high-speed rotating centrifugal disc through the feed tube, and is thrown out and atomized into tiny droplets under the action of centrifugal force. At the same time, after the hot air is heated to a predetermined temperature by the heater, it enters the drying chamber in the tangential direction and carries out sufficient heat and mass exchange with the atomized droplets, so that the water in the droplets quickly evaporates. The dried product enters the collection system with the air flow, and the tail gas is discharged after being treated by the dust removal device.

III. Centrifugal spray system design

1.Centrifugal Disc Design

Centrifugal disc is the core component of centrifugal spray system, and its speed and structure design directly affect the atomization effect. Usually made of stainless steel, precision machining to ensure smooth surface, no dead corners, to reduce material residue and blockage. The speed of the centrifugal disc can be adjusted according to the nature of the material and drying requirements to achieve the best atomization effect.

2. Nozzle and diversion device

Although high-speed centrifugal spray dryers rely primarily on centrifugal discs for atomization, some models may also be equipped with auxiliary nozzles to further refine the droplets. At the same time, the drying room is equipped with a diversion device to ensure the uniform mixing and effective contact of hot air and fog droplets.

3.Detailed explanation of heating and drying system

Heat source Selection：

Heating and drying systems usually use electric heating, steam heating or gas heating. Select the right heat source according to the production scale and energy consumption requirements. Electric heating has the advantages of precise temperature control and simple maintenance. Steam heating and gas heating have the advantages of high thermal efficiency and low cost.

Hot Air Circulation System：

The hot air circulation system includes a hot air generator, a hot air distributor, a drying chamber and a exhaust gas recovery device. After the hot air exchanges heat and mass with the droplets in the drying room, some of the tail gas may carry small particles that are not completely dried, and need to be recovered by the dust removal device. The recovered hot air can be partially or fully returned to the hot air generator for reheating to improve energy efficiency.

4.Control systems and automation

Control System Architecture：High speed centrifugal spray dryer adopts advanced PLC or DCS control system for automatic control.The system realizes man-machine interaction through touch screen or computer interface, which is convenient for users to set process parameters, monitor running status, record production data, etc.

Automation Function：

- Automatically adjust hot air temperature, centrifugal disc speed and other key process parameters;
- Real-time monitoring of equipment operating status, including motor current, bearing temperature, hot air temperature, etc.;
- Fault self-diagnosis and alarm function, once detected abnormal situation immediately cut off the relevant power supply and send an alarm signal;
- Data recording and analysis function to provide basis for production optimization and fault diagnosis.

5.Security protection mechanism

In order to ensure the safe operation of the equipment, the high-speed centrifugal spray dryer is equipped with a variety of safety protection mechanisms:
- Overheat protection: prevent equipment damage caused by excessive hot air temperature;
- Overload protection: prevent key components such as motors from being damaged due to overload;
- Emergency stop button: can quickly cut off all power in an emergency;
- Electrical isolation and grounding protection: ensure the safety and reliability of the electrical system.

6.Material selection and anti-corrosion treatment

Material selection：

- Parts in contact with materials (such as centrifugal discs, pipes, nozzles, etc.) are usually made of stainless steel (such as 304 or 316L) to resist corrosion and high temperature;
- For components such as heating elements and hot air pipes, suitable high temperature resistant alloys or special materials are selected according to the type of heat source and working environment.

Anti-corrosion treatment：For parts or areas that are susceptible to corrosion, anti-corrosion treatment is carried out by spraying anti-corrosion coatings, coating treatment or selecting anti-corrosion materials to extend the service life of the equipment.

IV. Operation process and maintenance

Operation Process ：

1. Check before starting: ensure that all components are correctly installed and securely connected; Check the supply of power, air, etc.; Clean dry room and pipes of debris.
2. Preheating system: Turn on the heat source device to preheat the hot air to the predetermined temperature.

3.Feed and start: start the centrifugal spray system and feed slowly; Start the hot air circulation system at the same time.
4. Monitoring and adjustment: monitor hot air temperature, centrifugal disk speed and other parameters according to process requirements; Adjust in time to maintain the best drying effect.
5. Collection of products: The dried products are collected and packaged through the collection system.
6. Shutdown and cleaning: After shutdown, clean the residual materials in the drying room and pipes;Turn off the power and air supply.

Maintenance ：

- Regularly clean the accumulated material and dust in the drying chamber and pipes;

- Check the wear of key components such as centrifugal discs and nozzles and replace them in time;
- Check the working status of electrical system and control system regularly;
- Regular replacement and maintenance of wearing parts and corrosive parts;
- Regular comprehensive inspection and performance evaluation of equipment to ensure long-term stable operation of equipment.

V.Maintenance Detailed Guide

1.Daily cleaning

- After each production, key parts such as the drying room, pipes, nozzles and centrifugal discs should be cleaned in time to remove residual materials and dust to avoid affecting the next production.
- Use appropriate cleaning tools and detergents to avoid damage or corrosion to the equipment.

2.Regular inspection

- Weekly or monthly (depending on production frequency and material characteristics) detailed inspection of all components of the equipment, including electrical connections, mechanical drives, seals, heating elements, etc.
- Check the wear condition of the centrifugal disc. If cracks, deformation or serious wear are found, it should be replaced in time.
- Check the blockage and wear of the nozzle, keep the nozzle smooth and atomizing effect.

3.Lubrication and maintenance

- Regular lubrication of parts that require lubrication (e.g. bearings, transmissions, etc.), using suitable lubricating oil or grease.
- Check the operation of the lubrication system to ensure that the supply of lubricating oil or grease is adequate and clean.

4.Electrical system maintenance

- Regularly check whether the wiring of the electrical control system is firm and whether there is loosening or short circuit.
- Clean electrical components such as contactors, relays, sensors, etc., to ensure that their surfaces are free of dust and dirt.
- Dust and moisture-proof treatment is carried out on the electrical control cabinet to ensure the normal operation of the electrical components.

5.Heating system maintenance

- Check the heating effect and insulation performance of the heating element regularly to ensure that it works properly and is safe and reliable.
- Clean the dust and dirt on the surface of the heating element to improve heating efficiency.
- Check the tightness and thermal efficiency of the hot air circulation system to ensure that the hot air is transmitted evenly and efficiently to the drying chamber.

6.Safety device inspection

- Regularly check the reliability and sensitivity of safety protection devices (such as overheat protection, overload protection, emergency stop button, etc.).
- Perform functional testing of safety devices to ensure that they can quickly cut off power or perform other safety measures in an emergency.

7.Performance Evaluation and optimization

- Periodically evaluate the performance of the equipment, including drying efficiency, product quality, energy consumption, etc.
- Make necessary adjustment and optimization of the equipment according to the evaluation results, such as adjusting process parameters, replacing worn parts, optimizing hot air circulation system, etc.
- Record and analyze production data to provide basis for continuous improvement and upgrade of equipment.

8.Training and Records

- Conduct equipment operation and maintenance training for operators to improve their operation skills and maintenance awareness.
- Establish equipment maintenance record files, and record the time, content, and replacement parts of each maintenance in detail.
- Regularly analyze maintenance records to identify potential problems and improvement points in equipment operation.

By following the above maintenance guidelines, you can ensure the long-term stable operation of the high-speed centrifugal spray dryer, improve production efficiency and product quality, and reduce operating costs and failure rates.

As a well-known drying equipment manufacturer in the industry, Jiangsu Bohong has always been committed to the research and development and innovation of spray drying technology since its establishment.Bohong company has a high-quality R & D team and advanced production equipment, with deep industry experience and excellent technical strength, in the field of spray drying established a good reputation.Jiangsu Bohong is customer-oriented, focusing on providing efficient, stable and environmentally friendly spray drying solutions for chemical, pharmaceutical, food, new materials and other industries.

Spray drying is one of the core equipment manufactured by Jiangsu Bohong. Advanced atomization system and heat exchange technology are used to ensure that the material is evenly refined and quickly dried in a short time, effectively retaining the nutrients and active substances in the material. Our spray drying equipment has the advantages of high drying efficiency, low energy consumption and stable product quality, which can meet the diversified needs of different customers for drying effects.