contraryFlow pressure spray dryermain features
1. The drying speed is fast, and the surface area of the material liquid is greatly increased after atomization. In the hot air flow, 95-98% of the water can be evaporated instantly, and the drying time is only tens of seconds to tens of seconds, which is particularly suitable for drying heat sensitive materials.
2. The obtained product is spherical particles with uniform particle size, good flowability, good solubility, high purity, and good quality.
3. Widely applicable, according to the characteristics of the material, it can be dried with hot air or granulated with cold air, with strong adaptability to the material.
4. Simple and stable operation, convenient control, and easy implementation of automated tasks.
technological process
Pressure spray granulation dryerIt mainly consists of a feeding system, a drying system, a dust removal system, a heating system, and an electrical system, each of which includes some related equipment.
The feeding system consists of a mixing tank, a filter, a diaphragm pump, and a spray gun. The secondary slurry that has been ball milled is transferred from the ball mill to the mixing tank, and is extracted and transported by a diaphragm pump through a filter. It then enters the drying tower through a spray gun.
The slurry enters the drying tower from the spray gun nozzle to start the spray granulation drying process, which is divided into three stages:
(1) Atomization of slurry.
The slurry is pumped into the drying tower from the nozzle by a diaphragm pump in the feeding system at a certain pressure. The energy of the pressure is converted into kinetic energy, and the slurry is sprayed from the nozzle from bottom to top, forming a high-speed liquid film. The liquid film then splits into droplets. The droplet size generated by atomization is inversely proportional to the pressure, and the production capacity of the nozzle is directly proportional to the square of the pressure.
(2) The mist particles dry into balls.
Mist particles and hot air work in a mixed flow. Hot air enters the tower through the hot air distributor on the top cover, and the hot air distributor generates a downward streamline airflow. Mist droplets are sprayed into the hot air flow from bottom to top. Droplets form spherical shapes due to surface tension, and due to their large surface area, water evaporates rapidly and dries, ultimately shrinking to form dry spherical particle powders.
The spherical particle powder formed gradually settles in the drying tower and separates from the hot air. The funnel-shaped cavity at the bottom of the tower collects the particle material and discharges it from the outlet. Finer particles are extracted together with dry air by a suction fan connected to the upper part of the funnel and enter the dust removal system.
(3) Unload the granular powder material.
The air supply fan, drying tower, and exhaust fan that transport hot air to the drying tower form the drying system.
The dust removal system consists of an efficient cyclone separator, bag filter, centrifugal fan, etc. The exhaust fan sends finer particles together with dry air into the high-efficiency cyclone separator. After effective separation, the finer particles enter the collection cylinder at the bottom of the separator for recovery. The remaining waste gas containing a very small amount of fine particles is sucked into the bag filter by a centrifugal fan for further dust removal and collection, achieving harmless treatment of the waste gas. Finally, the waste gas is discharged from the chimney.
In addition, the heating system composed of electric heaters and gas turbine hot air stoves provides hot air for the drying tower. The electrical system consisting of the electrical control cabinet and the on-site sensors installed at the inlet and outlet to monitor the temperature will monitor and control the main links of the entire spray granulation dryer to ensure the normal operation of the entire equipment.

Equipment parameters:

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