Overview

Spray dryer and spray drying tower are widely used in liquid forming process and drying industry. It is suitable for producing powder and granular solid products from suspended lotion, solution, lotion and paste liquid raw materials. Therefore, when the particle size distribution, residual moisture content, bulk density and particle shape of the finished product meet the standard of ^, spray dryer is a better drying process.

Key points

1. Contact between hot air flow and fog drops: when enough hot air flow enters the spray drying chamber, the direction and angle of hot air flow must be considered, whether it is concurrent flow, countercurrent flow or mixed flow, to ensure full contact with fog drops, so as to carry out full heat exchange.

2. Atomization: The atomization system of the spray dryer must ensure the uniform distribution of the droplet size, which is crucial. Because this is the only way to ensure the qualification rate of product quality.

3. Design of pipe angle and cone angle: We have obtained some experience data from the production of nearly 1000 spray drying units, which can be shared with you.

Characteristics

1. The spray dryer is fast. After the liquid is atomized, the surface area of the liquid increases greatly. In the process of contact with hot air, 95% -98% of the water can be evaporated instantly. The drying time only takes a few seconds. It is especially suitable for drying heat sensitive materials.

2. The product has good uniformity, fluidity, and solubility, and the higher the purity of the product, the better the quality.

3. The production process of spray dryer is simplified, and the operation and control are convenient. For liquids with a moisture content of 40-60% (up to 90% for special materials), they can be dried into powder products in one go without the need for crushing and screening, reducing production processes and improving product purity. The particle size, bulk density, and moisture content of the product can be adjusted within a certain range by changing the operating conditions, making control and management very convenient.

  working principle

The dryer is an open cycle, parallel flow, and centrifugal atomization system. The drying medium air is filtered by the primary and medium efficiency air filters, and then absorbed by the blower according to the operation instructions, heated by the heater, and enters the spray drying main tower through the hot air distributor of the high efficiency filter. The liquid material passes through the peristaltic pump according to the operating instructions and enters the high-speed rotating centrifugal nozzle, where it is dispersed into small droplets under the action of centrifugal force. In the main spray drying tower, small droplets are in full contact with the hot air, and after heat exchange along their specific path, they are dried into products, which are then separated through the cyclone separator. Solid materials are collected, and the gas medium is filtered and discharged. The whole set of spray system is easy to clean and free of dead corners, meeting GMP requirements.

  Application scope

Chemical products: polyaluminum chloride, dispersed dyes, reactive dyes, organic catalysts, white carbon black, laundry detergent, zinc sulfate, silicon dioxide, sodium metasilicate, potassium fluoride, calcium carbonate, potassium sulfate, inorganic catalysts, various waste liquids, etc.

Food: amino acids, vitamins, egg powder, bone meal, condiments, protein, milk powder, pig blood powder, soy sauce powder, coffee, tea, glucose, potassium sorbate, pectin, essence, spices, vegetable juice, yeast, starch, etc

Ceramics: alumina, zirconia, magnesia, titanium oxide, magnesium titanate, clay, porcelain clay, various ferrites and metal oxides, etc

 Technical specifications