Qianjiang Drying: Classification and Adaptation Range of Spray Dryers

There are several classification methods for spray dryers depending on the needs. For example, according to the flow direction of gas and liquid, there are parallel flow type (concurrent flow type), counter flow type and mixed flow type; according to the installation method of atomizer, there are upper spray type and lower spray type; according to the system, there are open type and partial circulation. And closed. It is well known that there are many types of spray-dried atomizers, but according to their atomization mechanism, the atomizers are classified into three types: centrifugal type, pressure type and air flow type. Habitually, people sort the spray dryer according to the atomization method, that is, according to the structure classification of the atomizer, the spray dryer is divided into three types: centrifugal (rotary type), pressure type (mechanical type), and airflow type. Type.

1. Centrifugal spray dryer

The centrifugal spray dryer relies on the centrifugal force generated by the high-speed rotation of the atomizing disk to atomize the liquid material and atomize it. The atomization effect depends on the circumferential linear velocity and the feeding rate, and also some physical properties of the liquid. related. By adding the liquid to the dispersing disc rotating at a high speed, the liquid is immersed into a mist by the centrifugal force and dispersed in the hot air, and the water is evaporated by heat to achieve the purpose of drying.

A centrifugal spray dryer is a drying device for materials such as emulsions, suspensions, pastes, and solutions. The equipment has the characteristics of fast drying speed and is suitable for the drying of materials with lower temperature, especially heat sensitive materials. Dry products have good dispersibility, flow and solubility. The scope of application of this device is:

Polymers and resins: polyacrylate, polycarbonate, polyethylene, polystyrene, polyoxymethylene, styrene butadiene resin, acrylonitrile butadiene resin, urea formaldehyde resin, polyvinyl acetate acetate, poly Vinyl alcohol and the like.

Organic compounds: aminophenol disulfonic acid, adipic acid, aluminum formate, calcium gluconate, calcium lactate, lysine, glutamic acid, salicylic acid, oxalic acid, potassium citrate, potassium sorbate, sodium benzoate , sodium acetate, etc.

Inorganic compounds: aluminum hydroxide, aluminum chloride, aluminum sulfate, ammonium chloride, ammonium nitrate, barium carbonate, boric acid, calcium carbonate, calcium chloride, graphite, iron oxide, kaolin, and the like.

Detergents and surface active classes: alkyl-formyl phthalates, detersive enzymes, dispersants, emulsifiers, synthetic laundry detergents, sodium lauryl sulfate and soap bases.

Medicines: streptomycin sulfate, vitamins, amide thiazole, tetracycline, ampicillin, dextrin and Chinese herbal plant extracts.

Carbohydrates, dairy products: glucose, lactose, starch, cheese, skim milk, whole milk and so on. And drying of rust removers, pesticides, dyes, pigments, ceramics, glass, minerals, etc.

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