Acid production from smelting flue gas, use of hydrogen peroxide for desulfurization, issues with the circulating liquid
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Our company uses hydrogen peroxide to desulfurize exhaust gases. The acid concentration in the circulating liquid is around 30%, and it is necessary to discharge this liquid periodically; it contains some unused hydrogen peroxide, which is then used as supplementary water for dry absorption processes. Since both the acid cooler and the acid delivery pipelines are under anodic protection, what impact will the entry of hydrogen peroxide into these two devices have on them? Personally, I believe that the oxidizing property of hydrogen peroxide can damage the passivation film that has already formed as part of the anodic protection, thereby leading to corrosion of the equipment and resulting in acid leakage incidents. There is no specific theoretical basis for this; I would like to ask if similar problems have occurred in the same industry before.
These are all minor issues; can you meet the standards regarding the acid mist emitted?
There’s electronic dance music behind, and the acid mist is up to standard.
The dilute sulfuric acid produced by hydrogen peroxide desulfurization contains 0.1%-1% hydrogen peroxide; process improvements can be made to eliminate the presence of hydrogen peroxide.
If it is a cast iron pipe, do not add it to the dry suction system; hydrogen embrittlement can cause the pipe to crack
Good question; it’s necessary to find smelters that use hydrogen peroxide for desulfurization
What process can ensure that the effluent contains no or only a small amount of hydrogen peroxide?
This post was last edited by mkp369 on 2018-5-31 at 14:38. For the decomposition of hydrogen peroxide, how can this process be accelerated? The main factors that affect its decomposition include temperature, pH value, impurities, and light. Next, I will explain in detail the decomposition of hydrogen peroxide and how to accelerate its decomposition. (1) Temperature: Hydrogen peroxide is relatively stable at lower temperatures and concentrations, but when heated above 153°C, it undergoes violent, explosive decomposition. (2) pH value: The acidity or alkalinity of the medium has a significant impact on the stability of hydrogen peroxide. Under acidic conditions, hydrogen peroxide is relatively stable, but it is very unstable under alkaline conditions and decomposes rapidly. (3) Impurities Impurities are an important factor affecting the decomposition of hydrogen peroxide. Many metal impurities such as Fe2+, Mn2+, Cu2+, Cr3+, etc., can accelerate its decomposition. Therefore, since industrial products contain a high amount of metal ion impurities, stabilizers must be added to suppress their catalytic decomposition effect. Furthermore, impurities such as dust and yeast can also cause the decomposition of hydrogen peroxide. (4) Light: http://www.csy17.com/news981.html Light can cause hydrogen peroxide to decompose, with light of a wavelength of 320–380 nm being particularly effective in accelerating this decomposition.
May I ask how much acid mist control your facility has? Was HJ544-2009 or HJ544-2016 used for the testing?
If it is a cast iron pipe, do not add it to dry suction, as hydrogen embrittlement can cause the pipe to crack. This kind of situation occurred in our factory, and later using concentrated sulfur dioxide to remove hydrogen peroxide also didn’t work. But the Yangbao pipeline is fine.