There are mainly the following ways of powder recovery in the powder coating line:
Cyclone Separator Recovery
Working Principle: Utilize the swirling motion formed by the airflow inside the cyclone separator. Under the action of centrifugal force, the powder particles are thrown towards the inner wall of the separator, fall along the inner wall to the collection device at the bottom, while the airflow is discharged from the central tube of the separator.
Advantages: Simple structure, reliable operation, low maintenance cost. It has a relatively high recovery efficiency for larger powder particles and can handle a large flow of powder-containing airflow.
Disadvantages: It has a relatively poor recovery effect on smaller particles (such as those smaller than 10 microns). It is usually used as a primary recovery device and is used in combination with other recovery devices.
Filter Cartridge Recovery
Working Principle: When the powder-containing airflow passes through the filter cartridge, the powder particles are intercepted on the surface of the filter cartridge, and the clean air passes through the filter cartridge and is discharged. When the powder accumulated on the surface of the filter cartridge reaches a certain level, the powder is blown off by means of pulse backblowing and other methods and collected in the powder collection device.
Advantages: It has a high recovery efficiency for powder particles of various sizes, especially for fine powder. It can effectively ensure the quality of the recovered powder, and the equipment operates stably with high filtration accuracy.
Disadvantages: The filter cartridge needs to be replaced or cleaned regularly. Otherwise, it will affect the recovery effect and the operating resistance of the equipment, increasing the operating cost and maintenance workload.
Electrostatic Powder Recovery
Working Principle: Utilize the principle of electrostatic adsorption to make the powder particles charged. Then, under the action of an electric field, the charged powder is adsorbed onto the collecting electrode, thus achieving the recovery of the powder.
Advantages: High recovery efficiency, capable of recovering extremely fine powder particles, with little pollution to the environment. And the recovered powder has good quality and can be directly reused in production.
Disadvantages: High equipment investment cost, certain requirements for the electrical conductivity of the powder. Regular maintenance and cleaning of the equipment are required to ensure the normal operation of the electrostatic system.
Wet Recovery
Working Principle: Use water or other liquids as the medium to make the powder-containing airflow fully contact with the liquid. The powder particles are captured by the liquid and form a suspension or precipitate, thus achieving the recovery of the powder.
Advantages: It has a good recovery effect for various types of powder. Especially for some flammable, explosive or toxic powders, wet recovery has a high level of safety and can effectively avoid dangers such as dust explosions.
Disadvantages: It requires a dedicated liquid treatment system, including equipment for liquid circulation, filtration and purification, etc. The operating cost is relatively high, and the recovered powder needs to undergo subsequent treatments such as drying, increasing the complexity of the process. At the same time, attention needs to be paid to preventing liquid leakage and pollution.
