Distance between agitator and bottom of tank
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The three maturation tanks equipped with low-speed stirrers, which were upgraded in March last year, had two of their stirrers experience base frame fractures by June this year. The inside of the curing tank has been treated for corrosion resistance; the bottom plate is lined with graphite and then covered with tiles. After parking and checking, it was found that the tiles at the bottom were bulging and falling off; this was the main cause of the mixing machine getting stuck. The analysis suggests that the tiles may have fallen off due to insufficient distance between the mixing blades and the bottom of the groove, resulting in excessive turbulence at the bottom. (The base plate is sloped, with a distance of less than 10 cm at the nearest point.) For those that have been operating stably for many years with a spacing of >30 cm, please discuss: is there any specification or standard regarding the spacing between the agitator and the bottom of the tank?
The distance between the agitator and the bottom of the tank usually needs to be large enough to avoid excessive disturbance of the tank bottom during agitation, which could cause materials such as tiles to fall off or get damaged. Generally, it is recommended that the distance between the mixing blades and the bottom of the tank be at least 30 cm, to ensure sufficient space for effective mixing without causing damage to the tank bottom. The specific spacing still needs to be determined by taking into account factors such as mixing intensity, tank material, and internal structure. In the absence of specific industry standards or specifications, it is recommended to refer to historical data from periods of stable operation and make adjustments and optimizations based on the actual circumstances. .
There is such a dimension in the principles of chemical engineering; I remember it’s a 1D distance, where D represents the diameter of the mixing impeller. It also depends on the type of mixing: propeller-type mixers, which are of the thrust-type, cause more damage to the bottom surface.
In actual production, it is generally controlled at 3-5 cm. If necessary, it can be even smaller!
This post was last edited by pzhmotor on 2024-7-1 10:27. It was indeed a mistake; after checking, the mixing distance from the bottom for the \"flat-blade\" type is 0.2–1Dj.