Increase in current of axial flow pump
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The ammonia-based desulfurization unit in our company uses a evaporation-crystallization process within a tower (single-effect evaporation). During this evaporation-crystallization process, the current drawn by the axial flow pump increases gradually as operating time progresses; this issue can only be resolved by completely draining the solid-liquid mixture from the evaporation and separation chamber each time. The maximum operating time shall not exceed 30 hours, with the solid content in the evaporation and separation chamber being around 20%. No better solution has been thought of yet to address the issue of increased current; only when the current in the axial flow pump remains constant can the sulfuric acid post-treatment system operate for a long time. Dear sea friends, please offer some good suggestions.
The liquid level in the evaporation separation chamber must not be too low, and the material concentration must not be too high
There is a good solution: use a thickener. The already crystallized ammonium sulfide suspension is fed into the thickener; since the crystals have a higher density than the mother liquor, they settle and go into the centrifuge, while the supernatant flows back to the evaporator. An efficient cyclone can also be used for this purpose.
Increase the liquid level in the evaporation system; maintain a solid-to-liquid ratio of 15-20. This ratio must remain stable and should not fluctuate greatly； If nothing else works, contact the axial flow pump manufacturer to check whether the selected model is appropriate
I don’t quite understand your manufacturing process, but we also have axial flow pumps in our workshop. If the current level is high, it’s definitely because the power of that pump is high, which also leads to increased vibration in the unit. When this happens, you should look for the cause in the manufacturing process, such as whether the temperature is too low Is the solid content too high (possibly the instrument is giving inaccurate readings, resulting in a lower displayed value when the actual level is higher)? Or is there a gas phase present in the liquid? Are there other process parameters that have an impact, such as raw materials, catalysts, etc.? It’s purely a personal opinion; there’s no need to consider it in too much detail.