Differences between merging and not merging the circulation tanks of the two absorption towers
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This post was last edited by Vincent11 on 2016-10-17 at 13:26. In plants that use a two-stage absorption process, each of the two absorption towers usually has its own acid circulation tank. Some factories combine the two absorption towers’ acid circulation tanks into one larger circulation tank, or use a structure in which the bottoms of the two circulation tanks are connected to each other. Since I have no experience with combined devices, I would appreciate it if fellow sailors could help analyze the differences between using them combined and not
It is generally believed that preventing sulfur dioxide in the dry acid from desorbing into the absorbing acid helps to avoid affecting the conversion rate.
In the production of sulfuric acid from sulfur, the drying process and the double absorption tanks can be combined, which helps to reduce the level of sulfur dioxide in the exhaust gases； If the combination of levels 1 and 2 increases the sulfur dioxide content in exhaust gases. Also, with such a merger, it will no longer be possible to produce fuming sulfuric acid
We have three towers and one tank; drying and the first suction are in one area, the second suction is in another area, with a partition wall in between.
So your company probably doesn’t have 93 acid products, right?
There is no 93 acid; it’s all 98 acid
We combine suction and compression; the exhaust gas level seems to be high, so the circulation tank must be large enough. We also have a system with a separate cycle; the control of acid concentration differs slightly in that case
In sulfur-based acid production, 98% dry air is used; there are three towers and one tank, with the dried air being recycled back into the process to facilitate acid production, and this setup can serve as a desorption tower. In pyrite-based acid production, 93% dry air is utilized, and the connection between the first and second absorption stages helps to reduce cross-contamination of acids, thereby facilitating better control over liquid levels and acid concentration
The difference lies in the impact on exhaust emissions, as some of the sulfur dioxide escapes.