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In a fluidized bed evaporator, heat transfer between walls of heated tubes and solutions belongs to a vapor-liquid-solid flow boiling, and solid particles are fluidized by a vapor-liquid flow. In this evaporator, evaporation can operate continuously without fouling on tube walls even for the solutions of high viscosity and density, like extract liquids of traditional Chinese medicines. In this article, a fluidized bed evaporator with an external natural circulating vapor-liquid-solid flow boiling at industrial scale with heat transfer area of 18.9 m 2  has been developed based on the previous experimental investigations in a laboratory evaporator and a pilot installation and applied in the evaporating concentration of extract liquids of traditional Chinese medicines first time. Its evaporation capacity changes from 1,100 to 1,400 kg/h. The relative density of extract solutions changes from 0.94 to 1.35, and viscosity from 1.69 to 20.68 Pa · s. Online zero-fouling and stable operations have been proved. Under similar conditions, overall heat transfer coefficient and evaporation intensity of industrial fluidized bed evaporators are higher than those of traditional vapor-liquid evaporators, but they decrease slightly compared to those of pilot one, and the reduced ratio is about 20%. Other examples of industrial applications are also introduced.

Industrial Applications of Fluidized Bed Evaporator in Evaporating Concentration of Extract Solutions