The spray dryer is a processing device used for drying the substances while utilizing a spray. The spray dryer mixes a heated gas with an atomized (sprayed) liquid stream within a vessel (drying chamber) to achieve evaporation and produce a free-flowing dry powder with a controlled average particle size that can further be converted into solid form as well. We are a spray dryer supplier based in the USA, along with spray dryers we also supply other processing equipment worldwide.
Some major components of spray dryer unit operation include a method for atomizing a solution or slurry; a source of hot air or an air/gas heater such as a waste flue gas; for achieving the heat and mass transfer a gas/spray mixing chamber with adequate residence time and droplet trajectory distance; a resource for recovering the solids from the gas stream; a fan to induce the required air/gas through the spray drying system. The surface area per unit weight is generated by the atomization of the liquid feed which is also a unique feature of the spray dryers.
To understand the process of spray drying, it is majorly conducted in four separate stages: the atomization of the feed; spray-air contact; drying; separation of the dried product from the drying air.
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Major utilization of spray dryers are for food processing and pharmaceutical industries, as well as for ceramic materials, creating paint pigments, catalyst supports, and also for the use with microalgae. Spray drying is also very commonly used for the technical processes to dry organic or aqueous solutions, suspension, dispersion, and emulsion in industrial chemistry and the food industry.
Spray drying is one of the oldest equipment or technique that has been evolved and developed over several decades from the 1870s to the 1900s period. The first spray dryer used the nozzle atomizers with rotary atomizers that was introduced several years later. The first major commercial use of the spray dryer was milk drying. It gained its popularity during the second world war to decrease the weight of transportation of food and other materials.
The spray dryer is most commonly used in the pharmaceutical industries for medicines and food industries to dry the liquid into a powder form and then convert that powder into a solid form if required. It is widely used in the food industry for dairy products and the dairy industries have very wide use of spray dryers to dry milk, cheese, and various other dairy products. Milk is concentrated in the falling film evaporator before spraying as the amount of liquid that an evaporator can evaporate is 1/10 than the amount of liquid a spray dryer can dry.
Spray Dryers are also used for egg products, food and plant products such as instant coffee powders, edible plant protein, fruits and vegetable products, carbohydrate and similar products, yeast products, cellulose products, slaughterhouse products, fish products, pharmaceutical products, etc. The spray dryer is used in all these industries for drying the liquid into a powder or solid form.