Achieve zero emissions from the exhaust gases of the 105 acid storage tank
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Dear experts: I am facing a problem in the design of the sulfuric acid tank area – when using 98% acid for the absorption of 105% acid exhaust gases, it tends to create negative pressure inside the 105% acid storage tank. While using a vent valve to draw in air, moisture can easily enter the tank as well. I would appreciate any suggestions you might have for solving this issue.
Is it okay to fill the tank top with nitrogen to maintain a slight positive pressure?
The exhaust gas containing 105% acid is actually sulfuric acid mist formed when sulfur trioxide comes into contact with water vapor in the air, and this acid mist cannot be absorbed; it can only be captured using mist collectors. If it is the vent for a 105% acid storage tank, a 93% acid seal can be installed to dry the inhaled air and absorb the sulfur trioxide exhaled.
Then we can only use a small sulfuric acid absorption tower; our company is currently installing one, and I’ll show you how it works once it’s in place
This method won’t work; it may cause the pressure inside the tank to become too high, leading to the tank lid being blown off. I’ve experienced this once – the breathing opening on the lid of a nicotinic acid tank got clogged with acidic sludge, and the entire lid exploded and was torn off
The meteorological outlet for fuming sulfuric acid is indeed prone to getting clogged by acidic sludge; it is recommended that you install safety valves and similar devices as part of the improvements.
We are making improvements by using a suction tube with negative pressure to draw out sulfur trioxide, leaving a gap at the inlet at the top of the tank. The drawn gas is then absorbed by the alkaline solution in the tower packing. It works very well when used at the acid discharge vessel; we plan to prepare a set for the storage tank as well.
Can we add a small high-level tank? It can be used to replenish the volume under negative pressure, with a breathing valve and nitrogen connected to the high-level tank.