Description of Spray Dryer:
Spray dryer is open circulation type, cocurrent flow type, atomizing is centrifugal type and operated in soft negative pressure condition.
The drying medium air is purified by pre, middle and high efficient filter, and than heated to hot air by heater. Then hot air enters spray drying chamber through hot air distributor. Material is transferred to atomizer by pump, then atomized to small forgdrops by centrifugal atomizer. Forgdrops contact with hot air fully and be dried. Powder product is collected by cyclone separator and air is exhausted. LPG series spray dryer has been widely used in battery materials, pharmaceutical, health products, chemical, feedstuff, ceramics, plastic and foodstuff industry for drying liquid material into fine powder.
Features of spray dryer:
The milk spray dryer is composed of air inlet filter system, air heating system and hot air distributor system, main drying tower, feeding and atomization system, high efficiency cyclone separator, product cooling and dehumidification system, dust removing system, etc.
This milk spray dryer is specially designed and manufactured by our company for spray drying milk according to the characteristics of whey. Combined with the most advanced spray drying technology of the same kind abroad and the long-term practical experience of our technicians, the equipment has the following characteristics:
1. Specially designed volute: Specially designed hot air volute of main tower. The hot air volute of main tower adopts accelerated structure to prevent material atomization droplets from returning to the top, hot melting, coking and deterioration.
2. Special designed hot air distributor: The hot air distributor adopts the structure of numerical helix acceleration, which greatly enhances the heat exchange between hot air and material droplets, and orderly swirling flow drops. The hot air distributor also combines the characteristics and requirements of this technology, so that there are air guide mechanisms on both sides of the distributor, and the angle can be adjusted arbitrarily to control the tangential angle when the hot air enters the tower. The inner air guide mechanism increases the rotation of the hot air, strengthens the shear force of the hot air on the atomized material film, makes the hot air fully contact with the material liquid, and strengthens the heat and mass exchange process between them.
3. Atomizer: The atomizer adopts a frequency converter to adjust the speed of the atomizer to achieve the best atomization effect.
4.The height diameter ratio of the straight cylinder of the main tower is adjusted from the conventional 0.9:1 to about 1.1:1; Extend the residence time of materials to ensure the drying effect. The taper of the tower cone is adjusted from the conventional included angle of 60 ° to 52 °, giving full consideration to the smoothness of the material during the cone blanking.
5. The lighting device in the tower, observation and cleaning door and manhole are designed to facilitate staff observation and customer visit. The pipeline adopts the quick installation design, which is convenient for the assembly, disassembly and cleaning of the equipment.
5. Medium circulation system: The system is composed of exhaust fan, blower, air regulating butterfly valve, air duct, etc. Both exhaust fan and blower are supplied by high-quality manufacturers, with years of cooperation and stable quality.
6. Freeze dehumidification system: In order to solve the softening and moisture absorption and caking of products in the product barrel of cyclone separator after long-term heating, a dehumidification air cooling system is specially designed. So the powder products can leave the high-temperature area in time and be cooled quickly, which is conducive to product packaging and maintaining a stable residual moisture content.
7. Air heating and purification system: It is composed of pre, middle efficiency and high efficiency air filter and hot air furnace. The hot air furnace has high thermal efficiency, stable heat output and high control accuracy.
8. Feeding system: The feeding system adopts fuzzy control to realize the automatic matching of feeding speed and outlet air temperature, avoid the influence of temperature fluctuation on the dry humidity of materials, and keep the moisture content of finished products at the required level, so as to ensure the quality of finished products.
The screw pump adopts variable frequency speed regulation, 4-20mA signal input, and automatically matches the air outlet temperature. The main part of the pipeline valve is SUS304 stainless steel, which is clean and sanitary.
9. Control system: The control system is controlled by PLC & touch screen. It has alarm function. And there are three levels of user management (operators, managers, equipment managers). Temperature control: the electric heating of air inlet temperature adopts grouping control, and PID control is used to control the electric heating, which ensures the accuracy of temperature control The outlet air temperature adopts the method of interlocking the speed of the feed pump and the outlet air temperature to accurately control the outlet air temperature.
The control system has high integration and automation level, which greatly reduces the number of on-site operators and has the function of fault self diagnosis. It can automatically deal with different faults in the system and give an alarm.
11. Other auxiliary system: They are all supplied by well-known manufacturers with reliable performance; Some pipelines are designed at a certain angle, and pressed smooth stainless steel pipes are used to avoid the phenomenon of material binding, blocking and excessive local resistance affecting material transportation.
Application of spray dryer:
New energy industry: Lithium Iron Phosphate, Lithium manganese iron phosphate, Graphene and so on.
Chemical industry: sodium fluoride (potassium), alkaline dyestuff and pigment, dyestuff intermediate, compound fertilizer, formaldehyde silicic acid, catalyst, sulphuric acid agent, amino acid, white carbon black, etc.
Plastic resin: AB, ABS latex, urea resin, phenolic resin, dense glue (urea) formaldehyde resins, polyethylene, polyvinyl chloride, etc.
Food industry: Fruit juice, yeast, plant extracts, fat-rich milk powder, lancet protein, cocoa milk powder, babymeal, hunting blood meal, egg white (yellow), etc.
Pharmaceutical industry: Western medicine, traditional Chinese medicine extracts, etc.
Sugar: corn syrup, corn starch, glucose, pectin, malt sugar, potassium sorbate, etc.
Ceramics: aluminium oxide, ceramic tile material, magnesium oxide, talcum powder, etc.
Parameters of spray dryer:
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| | Electricity, steam, thermal oil, gas, oil, coal, biomass, etc |
Product collecting system | |
| | Bag filter or wet scrubber |
| | Peristaltic pump or screw pump |
| | Centrifugal atomizer or pressure nozzle |
| | Touch screen & PLC/ Button type |
| | SUS304/ SUS316L/ Q235/ 2205 |
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