How to distinguish between moisture in the drying tower and the corresponding \"symptoms\" associated with acidity”
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This post was last edited by in the blink of an eye on 2019-5-25 08:07. The moisture level in the drying tower, as part of the sulfuric acid purification criteria, should be no more than 0.1 g/Nm3; in reality, many factories fail to meet this requirement. High moisture content in the flue gas at the outlet of the drying tower can lead to an increase in the flue gas dew point and a rise in the amount of acid mist generated in the downstream absorption tower. Many users attribute the accumulation of acidic sludge in the equipment and pipelines downstream of the drying tower to insufficient moisture levels in the tower; in fact, they fail to distinguish between moisture and acidic substances. As long as the moisture content in the drying tower does not exceed a certain value (such as 0.3 g/Nm3 or higher), the compression provided by the SO2 fan downstream is generally not sufficient to cause the moisture in the flue gas to reach saturation and precipitate. In the blink of an eye, the moisture content in the flue gas exiting the dryer was measured at 0.3 g/Nm3, yet the inner walls of the downstream pipes remained dry! Acid present in the drying tower can directly cause moisture or sulfate accumulation on the inner walls of the pipes downstream of the drying tower, as well as on the surfaces of the flow-through components of the SO2 fans located downstream. To improve the moisture levels in the drying tower, it is necessary to enhance the mass transfer process within the tower, while also ensuring that there are no leaks in the pipes from the outlet of the drying tower to the inlet of the fan. To address the issue of acidity in the drying tower, the focus should be on the wire mesh foam catcher; high-performance wire mesh foam catchers can be used for this purpose. Related link: Reasons why the production and maintenance of sulfuric acid plants remain at low levels https://bbs.hcbbs.com/thread-2679031-1-1.html
The idea is good – the tension of the screen.
Some users assume that the moisture level in the dryer is too high when they see that the inner walls of the pipes downstream of the dryer are wet; in fact, the moisture content in the air is much higher than that in the flue gas exiting the dryer (for example, at a relative humidity of 70-80%), yet the surfaces of objects in the air appear dry.
The first is the wire mesh demister, and the second is the adjustment of the acid dosage