The effect of naphthenic acid on the desulfurizer in the regeneration system.

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I have now installed a regeneration system with a capacity of 100 tons per hour, and the hydrogen sulfide content in the lean liquid is kept at 3 g/L. Recent tests have shown that the hydrogen sulfide level in the lean liquid often exceeds this limit, although the hydrogen sulfide content in the dry gas and liquefied gas from the upstream units is within acceptable limits. The method for preparing samples for hydrogen sulfide content determination is ； Redox titration method: After communicating with the technical staff from the desulfurizer manufacturers, the factors that affect hydrogen sulfide levels in the lean liquid ； It is suspected to be caused by naphthenic acids. (process ； The gas from atmospheric and vacuum distillation is fed directly into the gas storage tank; after being adsorbed by the lean liquid, it enters the dry gas pipeline network. The lean liquid is then regenerated, and it is found that its hydrogen sulfide content exceeds the specified limit. What should be done? ； Has anyone here come across such a situation? How did you guys handle it? ? ? ?