Discussion on the desulfurization method using PDS+ hydroquinone catalysts
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Some time ago, the desulfurization unit in our plant was operating normally, but today it suddenly stopped producing sulfur foam Our team leader and technicians are at a loss; they’ve tried many methods but still can’t solve it. Let’s discuss: what could be the reasons for this phenomenon? How to deal with it?
This post was last edited by SXZJX72338 on 2012-5-10 at 10:25. For crude benzene, instruments play a key role; for desulfurization, laboratory testing is crucial. PDS is mainly used to accelerate the reaction rate, while hydroquinone promotes foam formation. The various factors that affect desulfurization should be checked one by one. Of course, if the gas takes a shortcut (via a bypass), no sulfur is produced, and therefore no foam will form either. A thorough on-site inspection is the key.
There are many factors that affect desulfurization, but the disappearance of sulfur foam is mostly related to the desulfurization solution. It is possible to test the concentration of by-products in the desulfurization liquid, the catalyst concentration, changes in suspended sulfur, and changes in volatile ammonia – all of these factors have a significant impact on foam production. Next, check the regeneration process; if there are changes in the amount of gas or the circulation rate of the desulfurization liquid, the air volume also needs to be adjusted accordingly. Otherwise, excessive oxidation will result in the formation of elemental sulfur, while insufficient oxidation will lead to the production of large amounts of thiosalts. If the original poster can, sharing the test results would be more helpful for everyone to analyze them.
Check whether oil has entered the system – is the color of the desulfurization liquid dark? If that is the case, increase the overflow rate and add hydroquinone. Making rapid adjustments can cause the local temperature of the desulfurization liquid to rise, which in turn will cause the foam to disappear and the liquid level to drop; however, the foam will form again after a while and the liquid level will rise once more. For specific details, you can consult PDS’s after-sales service
Yesterday we carried out liquid level reduction treatment in the desulfurization tower, which resulted in a small amount of foam; it was not the normal output. We suspect that there might be too much desulfurization liquid in the entire system, which is discharged outside every day! Please point out any mistakes!
We don’t pay much attention to testing here, so there are no test data available as a basis. Copy search Copy search
The poster should check whether the processes prior to desulfurization are operating properly; if there are issues with initial cooling and electrostatic capture, it will lead to a significant reduction in the effectiveness of desulfurization
This post was last edited by hao101029 on 2012-5-15 21:47. We have also encountered a situation where no foam is produced in the desulfurization liquid; this is mainly caused by gas carrying washing oil. At that time, we increased the amount of hydroquinone and raised the liquid level in the regeneration tower. When such a problem occurs, it’s also necessary to consider whether there are issues with the impurity salts in the desulfurization liquid or with the volume of compressed air used.
This post was last edited by hao101029 on 2012-5-16 21:56. The level of by-products is too high, which causes the catalyst to become poisoned, especially by cyanide compounds; it is necessary to analyze the level of thiocyanate ions.
This kind of situation often occurs in our factory as well. One thing to check is whether there are any abnormalities in the crude benzene processing section ahead; if wash oil enters, then there will definitely be no foam. At that time, the desulfurization liquid takes on the smell of wash oil, the clear liquid becomes contaminated, the alkalinity drops, the catalyst concentration decreases rapidly, the catalyst gets poisoned, which leads to an increase in the amount of liquid that needs to be discharged. It is necessary to carry out rapid replacement by adding more alkali and catalyst
Winter is coming! The ambient temperature decreases. Check for infinite loops. It affected the desulfurization efficiency! There are two points I suggest you consider; I’m new here and not sure if what I say is correct!