I would like to ask experts: how is the substance that forms on the trays of the ammonia vaporization tower created?
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The remaining ammonia water enters the ceramic filter, then passes through the spiral alkaline solution mixer after reaching the spiral plate heat exchanger, and finally enters the ammonia vaporization tower. It appears at the lower feed inlet, with a diameter of about 8 centimeters, and it is hollow as well. It appears during the distillation of residual ammonia water in coking plants; analytical tests show 30% calcium, 28% ammonia, and 26% acid insolutes
This columnar scaling is likely to have originated from within the tray bubbles or from the metal filter located ahead of them; based on our experience in gasification, acidic impurities are generally considered to be sulfate scale
This occurred at the tower feed inlet. It can’t have formed on the tray
If that’s the case, it’s necessary to find out where caking occurs in the feed stream. Does the gas for your metal filter enter from the tube side or from the outside of the filter element?
After the ceramic filter, it passes through a spiral plate heat exchanger before reaching the liquid alkali mixer; this substance cannot pass through the spiral plate heat exchanger.
Then take a look at the equipment structure before feeding to see which part could produce such cylindrical objects, and then analyze the possible reasons for this
We also experience scaling here, but it’s not in a round, hollow form. The main reason is that the ammonia solution contains a lot of tar, which combines with lye to form scale. In our case, the scaling occurs on the tray surfaces and on the pipe walls; there are distinct layers of white and black color.
Impurities and rust in the pipelines and heat exchangers enter the tower and cause this issue.
Scale such as alkali slag! We usually clean our trays once a quarter!
I can tell you for sure that there’s a 90% chance of a leak in the primary cooler, as well as scale buildup in the circulating water