How should the centrifugal fan in the dryer be arranged?
In the drying equipment system, the commonly used fan is centrifugal fan.
The placement method of centrifugal fan in the drying system can be either single induced draft fan or double induced draft fans.
These two methods have their own characteristics:
A single induced draft fan is placed after the dust recovery equipment to make the drying equipment operate under negative pressure.
The advantage of this dry system is that dust and harmful gases will not leak into the atmospheric environment, but because of the high negative pressure in the drying equipment,
Frequent start and stop of centrifugal fan will cause partial instability in the tower and external air leakage into the dryer.
Therefore, the single induced draft method is only suitable for small drying systems.
For large-scale drying equipment, two centrifugal fans are mainly selected, one as blower and the other as induced draft fan.
This system has great flexibility and can improve the operating conditions of the dryer through regulating the pressure distribution of the pipeline, so that it can operate under the micro negative pressure close to the atmospheric pressure.
This not only coordinates the advantages of negative pressure operation, but also avoids the defect of dry power reduction due to air leakage into the system due to large negative pressure operation,
A micro negative pressure operation can ensure that the dust recovery equipment has the highest recovery rate.