Draft tube crystallizer introduction
The draft tube crystallizer is a kind of high-performance crystallizer appearing in the 1960s. It is firstly used in the production of potassium chloride and then widely used in the chemical, food and pharmaceutical industries. After years of operation inspection, this type of mold performance is good, it can produce larger grains (size up to 0.6 ~ 1.2mm), higher production intensity, the device is not easy to scale. It has become one of the main forms of continuous crystallizers and can be used in the crystallization of vacuum cooling, evaporation, direct contact freezing and reaction processes.
DTB mold structure diagram shown. There is a draft tube in the middle and a cylindrical baffle around. Near the lower end of the draft tube, a propeller (internal circulation axial flow pump) rotates at a lower rotational speed. Under the impetus of the propeller, the suspension rises to the surface of the liquid in the cylinder and then turns downward to flow through the annular passage between the flow guide cylinder and the baffle plate to the bottom of the vessel, and is reintroduced into the lower end of the draft cylinder. As a result, , Forming a condition close to good mixing. The cylindrical baffle separates the crystallizer into a crystal growth zone and a fining zone. The ring gap between the baffle and the partition wall is a clear zone where the effect of agitation has virtually disappeared to allow the crystals to settle off from the mother liquor and only the excess of the crystallites with the mother liquor outside the top of the clarification zone Crystal volume control. Mold for the upper part of the gas-liquid separation space, used to prevent entrainment mist. The hot concentrate is added under the draft tube and the slurry is discharged from the bottom of the crystallizer. In order to make the crystals have a narrower particle size distribution, such crystallizers are sometimes provided with elutriation legs in the lower part.
1. DTB type crystallizer cycle well, the bottom will not scale;
2. Because of the lower supersaturation, the draft tube limits the boiling range at the liquid surface to the area exiting the wall, so the fouling tendency at the boiling liquid surface is also greatly diminished.
3. Under normal circumstances, this mold can run continuously for three months to one year without cleaning.
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