Reasons for acid presence in the exhaust gas from the first absorption tower of the pyrite-based acid production dry absorption section and solutions
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Everyone is encouraged to participate and provide guidance.
The demister of the dry scrubber is not performing well and needs to be addressed.
I don’t know what the temperature of the incoming gas is, or what the temperature of the acid used for spraying is
When using acid, it is first necessary to check the acid distribution, the condition of the ceramic rings, and the defoaming efficiency. If the resistance of the porcelain ring is too high, a local short circuit will occur, the acid separation effect will be poor, and foam will be produced.
Any of the above answers is possible; it’s still necessary to check each item individually. There have been similar discussion posts on the forum for a long time.
There may be the following reasons: 1. The fiber demister is punctured, causing gas short-circuiting. 2. Large gas volume and high gas velocity result in flooding. 3. The absorption effect is poor, and the control of mild and strong acidity is inadequate. 4. The drying effect is poor, and acid mist enters the absorption tower.
In my opinion, this is due to poor control over the concentration and temperature of the circulating acid during the absorption process. If the concentration of the circulating acid is too low, condensate acid is likely to form inside the heat exchanger. On the other hand, if the temperature of the circulating acid is too high, a large amount of acid foam is generated during the absorption process; the higher the temperature, the finer the acid foam becomes. The finer the foam, the more difficult it is to capture it using foam traps. When this acid foam condenses inside the heat exchanger, it can also cause corrosion to the equipment.
1. Check the demister liquid seal cup for any blockages； 2. Check whether there is acid leakage at the flange gasket of the acid distribution pipe in the acid distributor ； 3. Check for short circuits in the demister