Battery material spray drying machine Graphene spray dryer

1. General description of Centrifugal Spray Dryer

 The hot air enters into the drying room of LPG Series Centrifugal Type Spray Dryer in the spiral form and uniformly. Passing through the high-speed centrifugal sprayer on the top of the tower, the material liquid will rotate and be sprayed into the extremely fine mist liquid beads. Through the very short time of contacting the heat air inside the LPG Spray Dryer, the materials can be dried into the final products. The final products will be discharged continuously from the bottom of the drying tower and from the cyclones. The waste gas will be discharged from blower. LEAD MACHINERY will design the bag filter to collect materials to reach 99.9% materials recollection of the LPG Spray Dryer. If some materials will be environment pollution, LEAD MACHINERY will design and manufacture the water scrubber.

The working of the pressure spray dryer as follows: the liquid of raw material is pumped in through diaphragm pump. The liquid of raw material be atomized into tiny droplets. Then it gathers with hot air and falls off. Most parts of powder material will be collected from the outlet of the main tower's bottom. For the fine powder, we will still continuously collect them by the cyclone separator and cloth bag filter or water scupper. But it should depend on the material property. 

Flow chart of LPG Centrifugal spray dryer

2. Structure of Centrifugal spray dryer

For the LPG centrifugal Spray Drying Machine, it consists of liquid transfer system, air filter system and heating system, liquid atomizing, drying tower, air exhausting and material collecting, control system and so on, the feature for each system as bellow:
1.   liquid transfer system
The liquid delivery system consists of liquid tank, pump and so on as to ensure the liquid enter into the atomizer smoothly.
2.Air filtering system and heating system
  Before the fresh air enter into the heater, it should pass through the Pre&post filter first, and then enter the heater for heating. For the heating method, there are electrical heater or steam radiator, gas furnace and so on. Which method to choose depends on the customer site conditions. To ensure the drying medium enter into the drying chamber with high purity, the heated air should go through the high temperature high efficiency filter (HEPA-Optional) before enters the drying chamber.
3. Atomizing system
The atomizing system consists of high speed centrifugal atomizer with inverter and so on.
 The powder from the high speed centrifugal atomizer is between 40-120 microns.
4. Drying tower system
 The drying chamber consists of the spiral shell, hot air distributor, main tower and relevant fittings.
The Spiral shell and hot air distributor: the spiral shell and hot air distributor at the air inlet of the tower top can regulate air flow rotation angle according to the specific condition, guide the air flow inside the tower effectively and avoid the material stick on the wall.in the middle there is the position for installing the atomizer.
 Drying tower: The inner wall is SUS mirror sheet, ad welded by the arc welding. The insulation is rock wool.
The tower is manhole and view port as to convenient to clean and maintain the tower. For the Tower body cross interface, pipe elbow are arc butt design, reduce dead angle; sealed type.
The main tower is equipped with air hammer, controlled by the pulse, and hitting the main drying tower timely as to avoid the dust stick on the wall
5. Air exhausting and product collecting system
 For the material collecting system, there are several types. Such as cyclone, cyclone + bag filter, bag filter, cyclone +water scrubber and so on. The method is depending on the material property itself. For the filtering system for the outlet air, we have filter on request.
6. Control system
HMI+PLC, each parameter can be displayed on the screen. Every parameter can be controlled and recorded easily. but it also can use button or touch screen.

3. Application of Centrifugal spray dryer

Battery material: Lithium manganese iron phosphate, Lithium Iron Phosphate, Graphene 

Chemical Industry: Sodium fluoride(potassium),alkaline dyestuff and pigment, dyestuff intermediate, compound fertilizer, formic silicic acid, catalyst, sulphuric acid agent, amino acid, white carbon and so on
Food Industry: Fatty milk powder ,protein, cocoa milk powder, substitute milk powder, egg white(yolk), food and plant, oats, chicken juice, coffee, instant dissoluble tea, seasoning Sugar, corn syrup, corn starch, glucose, pectin, malt sugar, and etc.