The GEA turbulence with draft tube and baffle crystallizer is the typical modern type of crystallizer in the industry. This is a typical model of mixing tank crystallizer. Draft tube is mounted inside, allowing crystals which are growing to be sent efficiently to the evaporation. In a continuous crystallization process employing an evaporative draft tube baffle (DTB) crystallizer apparatus to produce crystal product, the improvement which.
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For superior control over particle size when excessive fine crystals are present, the Swenson draft tube baffle DTB crystallizer has been proven highly effective. This type of crystallizer is used primarily in the cgystallizer of a variety of large-size crystalline materials such as ammonium sulfate, potassium chloride and diammonium phosphate for the fertilizer industry.
The DTB crystallizer is built in both the adiabatic cooling and evaporative types and consists of a body in which growing crystals are circulated from the lower portion to the boiling surface by means of a large, slow-moving propeller circulator. Surrounding the crystqllizer magma is an annular settling zone from which a stream of mother liquor bearing fine crystals can be removed.
These fines are separated from the growing suspension of crystals by gravitational settling in the annular baffle zone. Fines leaving the baffle zone are sent to a following stage, settler, or heat exchanger in the case of an evaporative DTB crystallizer.
Draft Tube Baffle Type | Chem Process Systems
The mother liquor is returned to the suction of the propeller circulator after the fines have been destroyed by heating or mixing with dilute feed or water, depending on the flowsheet. The boiling action is concentrated in the center of the thbe and is well distributed across the surface by means of the vertical draft tube inlet.
The low temperature drop at the boiling surface and the uniform distribution of boiling created by the circulation pattern minimizes crystallization buildup on the walls of the unit and extends the operating cycle. There are no tubs clearances where salt buildup can produce a large reduction in the rate of circulation as in baffld crystallizer designs.
Swenson DTB crystallizers are especially useful in multiple stage cooling crystallizer applications where cooling of the feed solution in each stage limits the natural slurry density to a few percent.
By means of the baffled zone, the operating slurry density within the crystallizet can be regulated at any desired value by controlling the slurry underflow rate and removing the remaining mother liquor from the baffle section. Organic and inorganic chemicals produced by the Swenson draft tube baffle crystallizer include: Swenson Technology is a global leader in the design and supply of chemical process equipment for separation.
We specialize in designing and installing innovative systems to convert liquid solutions into dry solids using evaporation, crystallization and drying.
Swenson Recognized with Export Leadership Award. Baffling allows slurry density control Swenson DTB crystallizers are especially useful in multiple stage cooling crystallizer applications where cooling of the feed solution in each stage limits the natural slurry density to a few percent.
Growing crystals are brought to the boiling surface where supersaturation is most intense and growth is most rapid. The baffle permits separation of tubd fine crystals from the suspension of growing crystals, thereby affecting control of the product size. Sufficient seed surface is maintained at the boiling surface to minimize harmful salt deposits on the equipment surfaces.
Draft Tube Baffle Crystallizer – Swenson Technology
Low head loss in the internal circulation paths makes large flows at low power requirements feasible. Capable of producing large singular crystals Lower operating costs Minimum space requirements, single support elevation Adaptable to most corrosion resistant materials of construction Can be tue instrument controlled Simplicity of operation, start-up and shutdown Produces a narrow crystal size distribution for easier drying and less caking Product size varies only slightly with large changes in production.
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