The solution in the natural external circulation evaporator circulates by the density difference of the feed liquid.
By adjusting the vibration parameters, the ordinary fluidized bed with serious backmixing can obtain ideal plug flow in continuous operation.
It is a heating steam jacket on the outside of the shell, and a rotatable scraper on the inside, which is driven by a rotating shaft in the center of the cylinder. After the raw material liquid is added tangentially from the upper part of the evaporator, driven by gravity and rotating scraper, a downward rotating film is formed along the inner wall surface of the shell.