In the production process of biological fertilizer, not only the water content of the formed particles generally exceeds the index and needs to be dried at low temperature, but also the water content of the organic material after fermentation is about 30% ~ 40%, and the water content of the particles after granulation is generally between 15% ~ 20%. The water content of the fertilizer quality index is required to be less than 14%, which needs to be dried. Therefore, the drying section is an indispensable and important process in the production process of biological fertilizer, which directly affects the output, quality and energy consumption. It is very important to reasonably select the model and specification of organic fertilizer dryer and control the process conditions.
A section of secondary granulation area is set at the front of the organic fertilizer dryer, in which the materials can realize secondary granulation. Then the materials are lifted up through the lifting plate and fully dried. The wet hot air is extracted from the tail of the dryer through the exhaust fan through the pipeline and enters the sedimentation chamber for sedimentation. The tail gas is sprayed to reduce dust through the washing tower after sedimentation. The spray water is pumped out by the water pump for recycling. After secondary dust reduction treatment, the tail gas is discharged into the atmosphere through the chimney.
The dried materials are sent to the cooler through the belt conveyor for cooling. In the cooling process, the natural air is sent to the cooler through the pipeline by the fan to cool the materials. The wind direction in the cooler is countercurrent. The tail gas pumped into the sedimentation chamber through the fan and pipeline is treated as the drying tail gas and discharged into the atmosphere.
The cooled materials enter the screening. After crushing, the large particle materials and the screened powder enter the return belt and are transported to the granulator for re granulation. The finished products enter the automatic packaging system for packaging.