The temperature of the acid in the drying column is high; seeking help~~
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Our plant has a new 200,000-ton per year system for producing acid from pyrite. The temperature of the acid in the drying tower is above the specified limit, reaching 53°C; the temperature of the acid at the inlet of the drying acid cooler is 69°C. The acid concentration is normal, the temperature of the gas exiting the purification unit is 39°C, and the water temperatures at the inlet and outlet of the acid cooler are also normal. I can’t figure out what’s going on here I would appreciate it if experts could give me some advice. Thank you!
The acid temperature at the inlet of the acid cooler is also quite high; it’s dry, and the heat exchange efficiency is decent
Reply to 2# yashiro: It seems that the heat exchange efficiency of the acid cooler is poor; in the other two systems, the temperature difference between the inlet and outlet of the dry acid coolers is between 24 and 27°C.
The temperature at the purification outlet is a bit high, with a large water flow rate. It reacts with acids to produce a large amount of heat. With a flue gas temperature of 39 degrees, very little acid is produced when water is added. The string acid has become quite large.
Is the dry acid cooler clogged, resulting in reduced heat exchange capacity?
Reduce the amount of water added during drying; it is best not to add water at all during this process. The ultimate solution is to increase the heat exchange area of the cooler used for drying and to lower the temperature of the water entering the circulation system, in other words, to enhance the capacity of the cooling tower
Based on today’s tests, it is suspected that scaling on the water side of the acid cooler is affecting the heat exchange efficiency; a check will be carried out during the next shutdown.
The acid cooler area corresponding to the production capacity is smaller, or scaling on the water side results in a poor cooling effect.
Main reason: The acid temperature is very high, indicating a heavy drying load (a large amount of water enters the dryer), and this load exceeds the design capacity of the acid cooler. Focus on investigating the reasons for high acid and temperature levels. If scaling occurs on the water side, it is also caused by high acid temperature; such high acid temperatures are rare with dry acid! ! !
If scaling does indeed occur on the water side and the temperature at the circulating water outlet is too high, cleaning should be carried out as soon as possible.
Reply to 1# 93331899: A purification outlet temperature of 39 degrees is still within normal limits. The key is to check the heat exchange efficiency of the acid cooler; carefully inspect whether there is scaling on the water side, as well as whether there is acid sludge or other debris on the acid side. If these issues are resolved and the problem persists, it is recommended to increase the heat exchange area.