Micro Mist Spray Dryer
Massive spraying of a single micron droplet become possible
Particle size distribution is sharp
Making a droplet of few microns in a large amount at production level is possible in atomization device (four-fluid nozzle) that our company has developed.
Spray dryer using that atomization device (four-fluid nozzle) is called micro mist dryer.
Characteristics of Four Fluid Nozzle
- Spraying the finest and uniformest ?mist(1 to 10 micron) from small to large capacity.
- Capable to spray high viscous liquid(up to 5000cp)
- Mixing two different liquid makes new kinds of product
Principles of spraying the finest mist
- Mixed flow of pressured air and liquid is accelerated on a center edge.
- Two mixed flow from both sides of nozzle collide at the nozzle tip.
- Shock wave is generated because of high speed of mixed flows.
- Shock wave makes liquid into the finest mist
Features of Four Fluid Nozzle
- Can massively spray a single micron droplet
- Can control the droplet median diameter by changing gas-liquid ratio
- Particle size distribution is sharp
- Can continuously spray high viscous liquid since it is external mixed type and there is no nozzle clogging.
- Can control spraying capacity by adjusting the edge length
| Micro mist spray dryer | Spray dryer | |||
| Four fluid nozzle | Two fluid nozzle | Pressure nozzle | Rotary atomizer | |
| Droplet particle diameter | Fine particle | Fine particle | Coarse particle | Coarse particle |
| 5 - 15µm | 5 - 30µm | 0 - 150µm | 10 - 100µm | |
| Atomization uniformity | Even | Uneven | Slightly uneven | Even |
| Method of Atomization | Compressed Gas | Compressed Gas | Pressurizing Pump | Motor |
| Atomization energy | Big | Big | Small | Small |
| Process liquid capacity/1 nozzle | High | Low |
Medium | High |
| Droplet diameter control |  at fine particle range |
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| Countermeasure against viscosity change | Air pressure | Air pressure | Fluid-pressure | Revolution |
| Liquid high viscosity | |
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| Maintainability | |
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| Spray angle | 180° | Under 30° | Under 60° | 180° |
| Spray shape | Hollow cone | Hollow cone fine | Full cone fine | Hollow cone |
| Few microns | Few dozen microns | |
| Surface area | If 5µm is 1 | 50µm is 100 |
| Volume | If 5µm is 1 | 50µm is 1000 |
| Surface area in same volume | If 5µm is 1 | 50µm is 1/10 |
| Number of pieces in 1ml | Approximately 15 billion 280 million in 5µm | Approximately 10 million and 528 thousand in 50µm |
| Drying time | Instant | Few seconds |
| Drying temperature | Can be lower. Drying temperature below the boiling point is possible | Difficult at temperature below the boiling point |
| Undried?????????? | None | Exhaust gas temperature and powder residence time should be considered. |
| Slurry primary particle | 1 to 2µm is requireds |
About below 10µm |
| Handling | Bad | Good |
| Collecting method | Cyclone + bag filter or bag filter only | Cyclone Bag filter as a dust collector |
| Liquidity | Bad | Good |
Solubility |
Good | Bad |
| Tap density | Good | Bad |
| Reactivity | Good | Bad |
| Product novelty | Present | None |
Four fluid nozzle
types
and spraying state
Straight edge nozzle
Circle edge nozzle
