The acid mist level in the gas exiting the second absorption tower is above the specified limit
Thread Content
For a sulfur iron ore-based acid production system that does not incorporate low-temperature recovery, and when tested using the exhaust gas acid mist detection methods issued on May 1, 2016, the sulfuric acid mist at the outlet of the second absorption tower was 20 milligrams per cubic meter, which is within the acceptable range. There is also a sulfuric acid production system with low-temperature recovery; tests were carried out using the exhaust acid mist detection methods issued on May 1, 2016, and the sulfuric acid mist at the outlet of the second absorption tower was in the range of 300–700 milligrams per cubic meter, which is far above the acceptable levels and indicates severe non-compliance. Is it because the high-temperature absorption tower is not performing well? Or is it caused by other reasons? Fellow colleagues, have you encountered the same problem?
The main issues are drying, absorption, and demisting
It’s the domestic mist eliminator used for the two-stage sulfuric acid production towers, right?
It is necessary to check using the elimination method to determine whether the acid separator in the two absorption towers, as well as the acid temperature and inlet air temperature of the towers, are within acceptable ranges; simply identifying that certain parameters exceed the limits is not sufficient to determine the appropriate course of action. Of course, the mist eliminator also needs to be inspected.
The acid temperature at the inlet of the second absorption tower is 65 degrees, while the temperature of the air is 160 degrees. The acid distributor was inspected during a major maintenance routine, and no issues were found. Has any sulfuric acid production plant equipped with low-temperature recovery analyzed the acid mist at the outlet of the second absorption tower?