The main drying equipment options for aniline black include vacuum rake dryers, hollow paddle dryers, and fluidized bed dryers. Selection depends on production volume, material condition, and environmental requirements.
Common types of drying equipment
Vacuum rake dryers
Applications
Vacuum rake dryers are suitable for small batches of heat-sensitive aniline black filter cake. The vacuum environment allows drying at temperatures of 60 to 80°C, helping prevent thermal decomposition and discoloration. The internal rake agitators break up agglomerated material during drying, making this equipment suitable for batch processing.
Main operating parameters
Vacuum level: 0.08 to 0.095 MPa
Agitator speed: 10 to 30 r/min
Drying cycle per batch: 4 to 8 hours
Final moisture content: consistently below 0.3%
Hollow paddle dryers
Applications
Hollow paddle dryers are suitable for continuous, large-scale aniline black production. The hollow paddles transfer heat by conduction, improving heat transfer efficiency. A fully enclosed housing helps reduce the release of volatile organic compounds (VOCs) into the surrounding environment.
These dryers can directly process aniline black filter cake with a moisture content of approximately 60%.
Main operating parameters
Heat transfer oil temperature in the jacket: 100 to 120°C
Paddle speed: 5 to 15 r/min
Capacity per unit: 500 to 2,000 kg/h
Final moisture content: ≤ 0.5%
Fluidized bed dryers
Applications
Fluidized bed dryers are suitable for drying finished aniline black with regularly shaped particles. Hot air passes through the material bed, providing rapid heat transfer. However, the material particle size needs to be within 0.1 to 5 mm to reduce the risk of excessive dust entrainment or bed collapse.
Main operating parameters
Hot air temperature: 120 to 150°C
Fluidization air velocity: 1.2 to 1.8 m/s
Material residence time: 10 to 30 seconds
Final moisture content: 0.2% to 0.5%
Equipment selection and safety requirements
Selecting equipment for heat-sensitive materials
For heat-sensitive aniline black, vacuum rake dryers or hollow paddle dryers are the preferred options described here. Open hot air drying equipment should not be used where high temperatures could cause material degradation and discoloration.
VOC emission control
For projects subject to environmental compliance requirements, fully enclosed drying equipment should be selected. Activated carbon adsorption or a regenerative thermal oxidizer (RTO) can be used to treat VOC exhaust gas and reduce uncontrolled emissions of aniline-related pollutants.
Dust explosion protection
Where dust explosion hazards exist, the drying equipment should incorporate explosion relief features and a real-time dust concentration monitoring system. Operators should wear appropriate protective equipment, including gas masks and protective gloves.
Matching equipment to production volume
For small-batch or customized production, a batch-operated vacuum rake dryer is the preferred option. For large-scale production, a continuous hollow paddle dryer is the preferred option. The final selection should account for the material condition, required moisture content, and production requirements.
Custom machining for industrial equipment
Beyond components used in drying systems, Hansheng Automation provides custom precision machining for non-standard industrial parts according to customer supplied drawings. Our services also cover parts for filling machinery and tobacco packaging equipment, as well as precision components for yacht systems and remote control racing cars. Each component is manufactured according to the specified dimensions and structural requirements.
