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The spray drying technique was first described in 1860 with the first spray dryer instrument patented by Samuel Percy in 1872. [citation needed] With time, the spray drying method grew in popularity, at first mainly for milk production in the 1920s and during World War II, when there was a need to reduce the weight and volume of food and other materials.
Spray drying and spray painting are the most important and common uses of this technology. Many industries need to convert a large mass of liquid into a dispersion of small (micron-size) droplets (generate a spray). Some examples of this need are evaporative cooling, meteorology, printing, medical applications, spray combustion, coating, and ...
Schematic process flow of FGD plant; 5000 MW FGD Plant (includes a detailed process flow diagram) Alstom presentation to UN-ECE on air pollution control (includes process flow diagram for dry, wet and seawater FGD) Flue Gas Treatment article including the removal of hydrogen chloride, sulfur trioxide, and other heavy metal particles such as ...
A piping and instrumentation diagram (P&ID) is defined as follows: A diagram which shows the interconnection of process equipment and the instrumentation used to control the process. In the process industry, a standard set of symbols is used to prepare drawings of processes. The instrument symbols used in these drawings are generally based on ...
A process flow diagram (PFD) is a diagram commonly used in chemical and process engineering to indicate the general flow of plant processes and equipment. The PFD displays the relationship between major equipment of a plant facility and does not show minor details such as piping details and designations.
Meanings of letters and numbers: A=Solution or suspension to be dried in, B=Atomization gas in, 1= Drying gas in, 2=Heating of drying gas, 3=Spraying of solution or suspension, 4=Drying chamber, 5=Part between drying chamber and cyclone, 6=Cyclone, 7=Drying gas is taken away, 8=Collection vessel of product, arrows mean that this is co-current lab-spraydryer
Spray drying is sometimes seen as a form of flash evaporation. However, although it is a form of liquid evaporation, it is quite different from flash evaporation. In spray drying, a slurry of very small solids is rapidly dried by suspension in a hot gas.
Spray drying requires that the droplet sizes be closely controlled. In general, increasing the total drop surface area within the dryer will lead to higher evaporation rates and greater efficiency for the process. [6] Similarly, pharmaceutical tablets owe their thin film surface coating to an atomizer produced spray that needs to be perfect ...
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