FC crystallizer

The external heating forced circulation evaporative crystallizer consists of a tubular converter (also known as a heating chamber), an evaporative crystallization chamber, a forced circulation horizontal axial flow pump, and upper and lower circulation pipes. The crystal particle size is not large, about 0.15-0.3mm. Its characteristics are simple structure and easy operation. Designers should pay attention to the structural design that the position of the evaporation crystallization chamber should be 4-6m higher than the position of the heating chamber<the distance from the liquid level of the evaporation crystallization chamber to the tube plate on the heating chamber>, to ensure that the upper tube mouth of the heat exchange tube does not boil, there will be no crystallization precipitation in the heat exchange tube, and there will be no tube blockage phenomenon. Secondly, in the design of the upper circulation tube, the flow velocity inside the tube should be less than 1m/s, and the flow velocity inside the lower circulation tube can be designed as 1.3m-1.5m/s. The purpose is that when the heated solution enters the evaporation crystallization chamber, bubbles will be generated in the upper circulation tube due to the influence of vacuum degree. To prevent sudden boiling, the diameter of the tube should be slightly larger than that of the lower circulation tube. The crystallization chamber has a conical bottom. After the crystal slurry is discharged from the conical bottom, it is pumped through an axial flow circulation pump through a circulation tube and then heated or cooled before entering the crystallization chamber again. This cycle continues endlessly, so this type of crystallizer belongs to the crystal slurry circulation type. The slurry discharge port is located near the bottom of the crystallization chamber cone, while the feed port is located at a lower position below the discharge port.