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How to select the diameter of the wire mesh defoamer for crystallizers of different diameters?

2016-09-09View Original

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How should the diameter of the wire mesh defoamer be chosen for crystallizers of different diameters?
Reply #22016-09-27
For the demisters installed in evaporation crystallizers of different diameters and under various operating conditions, whether they are of the mesh type, multi-factor swirl parent-child type, or high-efficiency air-liquid demisting and separation type, accurate calculation and design must be carried out on a specialized system design platform taking into account the specific operating conditions, in order to determine the dimensions of the internal components and their installation locations. For the same demister, different installation positions result in varying airflow contraction effects, leading to significant differences in the efficiency of foam removal; in some cases, there is almost no efficiency in foam removal at all. Therefore, the demister requires internal component configuration and installation plans provided by a professional company specializing in dynamic separation technology. It must not be purchased by the shell manufacturer on their own and installed casually. Furthermore, the saline and alkaline foam carried by the secondary steam from the crystallizer tends to crystallize and precipitate. Screen-type demisters that are prone to clogging should not be used. The blocked crystalline deposits are difficult to remove even after soaking them in a solution at a higher temperature for several hours; steam cleaning has also proven ineffective for some companies. Therefore, in recent years, the demisters used in evaporation crystallizers have increasingly adopted high-efficiency feather-leaf gas-liquid demisting and mist-separating internals, as well as multi-factor swirl parent-child separating internals, thereby upgrading the technology and replacing traditional mesh-type demisters.

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