DTB Continuous Crystallizing Evaporator Also called diversion barrel-baffle evaporative crystallizer, it is also a kind of crystal mush circulation type continuous crystallizer. The crystallizer connects with the elutriating cylinder at its bottom and is provided with the diversion barrel and barrel-shaped baffle. During the operation, the hot saturated liquid is continuously fed to the bottom of the circulating tube. After mixed with stock solution containing small crystals in the circulating tube, it is sent to the heater by the pump. The heated solution flows into the crystallizer near the bottom of diversion barrel, and is sent to the liquid surface along the diversion barrel by the slowly rotated screw propeller. The solution is evaporated and cooled on the liquid surface, reaching the status of supersaturation. Some solute will deposit on the surface of suspended grains to make the crystal grow. There is a sedimentation area outside the annular baffle. Inside the sedimentation area, the big grains settle, and the small grains enter the circulating tube with the stock solution and are heated and dissolved. The crystal enters the elutriating cylinder from the bottom of the crystallizer. To make the granularity of crystallized products as even as possible, some stock solution from the sedimentation area are fed to the bottom of the elutriating cylinder. By using the effect of hydraulic classification, the small grains will return to the crystallizer with the liquid and the crystallized products will be discharged from the bottom of the elutriating cylinder is constituted. FORCED CIRCULATION TYPE EVAPORATIVE CRYSTALLIZER It is a kind of crystal mush circulation type continuous crystallizer. During the operation, the feed liquid is fed from the bottom of the circulating tube. After mixed with crystal mush that has left the bottom of the crystallizing chamber, it is sent to the heating chamber by the pump. When crystal mush is heated (generally 2~6) in the heating chamber, no evaporation occurs.
