The sulfuric acid circulation tank produces fuming sulfuric acid; the solution is...
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All indicators are within acceptable limits, and production is running normally. However, from early morning until noon, a problem occurs: the company produces acid from flue gases from non-ferrous metal smelting. The acid recycling system uses three interconnected tanks, with holes at the bottom allowing the acid to flow from one tank to another; this method takes advantage of the difference in liquid levels to transfer the acid, thus eliminating the need for acid pumps. Yet, during each morning inspection, large amounts of fuming sulfuric acid are generated, which is very irritating… This leads to a deteriorating working environment. I would appreciate advice from those with experience in this area. . . :handshake
Holes for acid flow are provided at the bottom of the circulation tank to enable acid flow; in that case, stable acid flow can only be maintained when acid flows in one direction! Acid flow must be as continuous and stable as possible! Based on what you’ve described, the way acid flow is managed in your facility does not meet the requirements! How can the production staff maintain a stable acid concentration?
In a flash, I just got here and realized there was a problem with the acidity level; now it’s being adjusted manually. This circulating acid tank was designed by a local veteran engineer 6 years ago; it is likely that cost savings were the reason behind this, which has led to the problems we see now. Also, due to the passage of time, the acid-resistant plaster tiles at the bottom have likely been severely corroded. There is now a concern that acid might leak from the bottom of the acid tank, which would pose a serious problem. . . I hope experts can advise on how to make the modifications in the shortest possible time without affecting production…:handshake
This section is designed for this purpose: 1. It allows users to search for their own posts, such as “Overview of the ADB sulfuric acid sub-project in our factory”, which contains a flowchart of the acid circulation process in the dry absorption stage. 2. Search for keywords such as “dry absorption” and “acid stringing”, and look carefully.
Okay! Thank you for the guidance! Hehe:handshake
If the tank is airtight, a pipe can be connected to the top of it and led to the inlet of the drying tower (for the fan located in front of the tower), so that negative pressure can be used to carry away the flue gas and absorb it.
The acid circulation tank in your plant is not designed properly; what escapes from this tank are irritating substances such as SO2 and acid mist. Since your plant produces acid from smelting flue gas, the drying and absorption tanks should be separated. 93% acid should be used for drying, while 98% acid should be used for absorption. A pipe should be connected before the electrostatic precipitator to draw the flue gas into the system using negative pressure.
A tee is installed at the horizontal section of the acid pipe in the two sections, and acid is circulated on both sides at the bottom of the pipe. This approach does not consume any energy and the modification can be carried out quickly; however, valves are required to regulate the amount of acid circulated and to ensure stable acid concentration.
In the case of a two-turn two-suction process, where the drying and suction steps are carried out using 3 towers and 3 tanks, the acid interconnection sequence can be as follows: 1. The drying tower and the first suction tower are interconnected； 2. The acid concentration in the two-stage absorption cycle is adjusted by adding water ； 3. A acid supply bypass is provided for the first suction and second suction circulation tanks. In total, there are 5 control valves.
Air is introduced into the dry scrubber through an air inlet at the top of the circulation tank, and the flue gas is removed using negative pressure