Oslo mold design

This may require referring to some professional materials. ------------------------------------------------------------ 1. Overview: OLSO crystallizers are continuously operating crystallization devices, which come in three types: evaporation type, cold crystallization type, and vacuum evaporation type. 2. Working principle: Its main feature is that the area where supersaturation is generated and the crystal growth area are located at two different positions within the crystallizer; the crystals remain in a fluidized suspension within the circulating mother liquor, which provides favorable conditions for crystal growth. Based on continuous operation, large and uniform crystals can be grown, which can be used to produce crystal products with a high M.S. value and a very low C.V. value. Taking the Oslo vacuum cooling crystallizer as an example: the crystallizer consists of a vaporization chamber and a crystallization chamber. The body of the crystallization chamber usually has a certain degree of taper, with a larger cross-sectional area at the upper part than at the lower part. After being mixed with the hot concentrated solution, the mother liquor is pumped to a higher-position vaporization chamber by a circulation pump. In this chamber, the solution vaporizes and cools, resulting in supersaturation; thereafter, it flows to the bottom of the crystallization chamber through a central downcomer before moving upward again. The crystals are suspended in this fluid flow to form a fluidized bed with particle size grading; the larger crystals accumulate at the bottom layer, where they come into contact with the solution with the highest supersaturation flowing out of the downcomer, allowing them to grow larger. In the crystallization chamber, the upward flow velocity of the liquid gradually decreases; the particle size of the suspended crystals becomes smaller as one moves upward. As the supersaturated solution moves upward through the crystal suspension bed, its supersaturation is gradually reduced. When the solution reaches the top of the crystallization chamber, it basically no longer contains crystals, and as a clear mother liquor, it overflows from the top of the crystallization chamber into the circulation circuit. The feed pipe is located on the suction line of the circulation pump; the mother liquor mixes again with the hot concentrated solution in the circulation circuit, and then enters the region where supersaturation occurs—the vaporization chamber. The Oslo-type evaporation crystallizer is essentially similar to the vacuum-cooling type; it consists mainly of a vaporization chamber and a crystallization chamber, with a steam heater added to the circulation pipeline. As the solution flows through the heater, it is under a sufficiently high static head to prevent vaporization and the formation of crystalline scale. Compared with the vacuum cooling method, the cooling-type OSLO crystallizer eliminates the vaporization chamber and adds a shell-and-tube cooler to the circulation pipeline, with the mother liquor passing through once. The hot concentrated solution is added before the circulation pump, where it mixes with the circulating mother liquor and then passes through the cooler. After being cooled, the solution becomes supersaturated, but its degree of supersaturation is not sufficient to cause spontaneous nucleation. Operation is carried out via mother liquor recycling, with the ratio of the recycled liquid volume to the feed volume being approximately 50 to 200 times. The slurry product can be discharged from the bottom of the vessel through a salt catcher installed there. The excess fine crystals suspended near the surface of the liquid are discharged outside the device through the overflow port together with the clear mother liquor.

Let’s see if these experts can help. ‘’ @68ZCW @ZhizheMing @CatalystYiSu @StorageAndTransportEngineer @leo_0088

https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1662511 There are some designs for crystallizers on that website; they seem quite useful. Fellow netizens can take a look