Reasons for the darkening of potassium carbonate-based vacuum desulfurization solution
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Seeking help: 1. What are the main processes for gas purification and desulfurization? 2. What is the current operating status of vacuum potassium carbonate desulfurization processes at home and abroad? 3. Which domestic factories use the vacuum potassium carbonate desulfurization process? 4. Has the desulfurization liquid turned black during the operation of the vacuum potassium carbonate desulfurization process? What measures should be taken after it turns black? Why does the desulfurization solution turn black? Does anyone know the principle behind this? ? ? Thank you! reward_7ree
What the original poster is asking can all be found on the internet
Reason: The mist-trapping performance of the mist catcher at the top of the benzene washing tower is poor, which causes the washing oil entrained in the gas after passing through the benzene washing tower to enter the desulfurization tower, resulting in the desulfurization liquid turning black. Measure: The oil-lean liquid distribution method at the top of the benzene washing tower was changed from nozzles to a splash disk type of liquid distributor. A mist-trapping layer was installed above this distributor, and the mist-trapping area of the mist trap at the tower top was increased. This reduced the atomization of the washing oil and minimized the amount of washing oil carried away by the gas.
1. There are many processes for gas desulfurization; the original poster can look up relevant papers. 2. From what I know regarding domestic vacuum potassium carbonate, its performance is better compared to other desulfurization processes, and it has relatively fewer problems than those processes. 3. The coking plants of many steel mills, such as Wuhan Iron and Steel, Meizhou Iron and Steel, and Handan Iron and Steel, all use the vacuum potassium carbonate desulfurization process. 4. The darkening of the desulfurization liquid is mainly due to a leaky negative pressure system. Oxygen entering the system leads to an increase in salts in the desulfurization solution, among other effects. Remedial action: Locate the leak and seal it ； Replace the desulfurization liquid.
If it’s not for this reason, then this can definitely be ruled out
It is also caused by pressure-induced leakage, with the reason being the high ammonia content in the gas. At present, we know how to deal with it, but we do not understand the exact mechanism behind why an excess of ammonia causes the desulfurization liquid to turn black.
This post was last edited by sgliuxqi on 2016-9-22 11:16. What is the ammonia content in gas? Could I take a look at your relevant process data?
I really can’t receive them, especially from abroad
The ammonia content in the gas is not always high; it fluctuates occasionally and exceeds the specified level of 0.05. As a result of desulfurization, the ammonia content in the vacuum condensate increases, rising from around 0.30 to over 1 g/L. If this is not addressed promptly, the desulfurization liquid will quickly turn black, and the situation will worsen