Foam problem in biodesulfurization absorption towers for biogas
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There is a biological desulfurization unit for biogas, which uses a modular process: the absorption of hydrogen sulfide and the regeneration of the alkali are carried out separately in an absorption tower and a biological regeneration tower, with elemental sulfur being the final product. The problem encountered at present is the formation of foam in the absorption tower, to such an extent that it has blocked the inlet of the biogas pipeline. I wonder if anyone has encountered similar problems – what causes them and how can they be resolved?
We have encountered this situation as well; using alkalis to remove hydrogen sulfide can easily result in the formation of saturated sodium sulfide, which tends to precipitate at low temperatures. Therefore, the alkaline solution needs to be regularly drained and replaced
Foam can be eliminated by spraying the lean liquid from the circulating fluid
It’s still about the PDS agent; sulfur’s stickiness makes it prone to causing blockages
It’s still about the PDS agent; sulfur’s stickiness makes it prone to causing blockages