Design of the clarification tank
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This post was last edited by sunjl1981 on 2013-1-7 00:10. Assuming a brine flow rate of 12 m3/h, what is the height of the clear liquid layer? What is the diameter of the tank? What is the upward flow velocity of the clear liquid layer? And what is the total time it stays inside the tank? This post was last edited by haining on 2009-3-17 08:36.] # hcbbs
About 12 m³/h. . A clarification tank with a diameter of 8 meters is usually sufficient. The height of the clear liquid layer depends on the operating conditions; it generally can reach over 2 meters. The rising speed needs to be calculated separately. Typically, the diameter of the central tank is 600 MM, the height of the clarification tank is 4 meters, and the residence time also needs to be calculated on its own
The diameter is 8 meters; the diameter of the central barrel should be 600 MM. 600 cm seems too small as well
I was wrong; if the diameter is 8 meters, the diameter of the central barrel has to be at least 2 meters
Are there any design specifications for this? I want to learn * too
The typical rising speed of the clear liquid is 0.4–0.6 meters per hour; the diameter is calculated as flow rate / 0.785 / rising speed, and then the result is taken to the square root
Dow clarified that the operational flexibility of its tanks is very high; a Dow tank with a diameter of 7 meters can even meet the requirements for producing 30,000 tons of diaphragm caustic soda, which means that the water output rate can reach 36–40 cubic meters per hour. But the key still lies in the quality of the raw salt and the refining reaction time. If the quality of the raw salt is good, for example, with a total content of calcium and magnesium less than 0.3% and a ratio of calcium to magnesium greater than 1.5, then there is plenty of headroom. If the quality of the raw salt is poor, a larger diameter bucket is necessary; what the friend mentioned earlier about choosing a Dor bucket with a diameter of 8 meters is quite reasonable, as it provides sufficient headroom. Additionally, the poster mentioned a saltwater flow rate of 12 cubic meters per hour; I think this might correspond to a scale of 10,000 tons of caustic soda. However, in the case of a diaphragm caustic soda production process, an average flow rate of 12 cubic meters per hour is not sufficient. 15 cubic meters per hour should be chosen.