What are the reasons for the frequent fluctuations in the liquid level of the regenerator tower in a hydrogenated dry gas desulfurization unit?

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Recently, the liquid level in the regeneration tower of our plant’s hydrogenation dry gas desulfurization unit has been fluctuating frequently, and these issues cannot be resolved completely. We believe the reason might be that the temperature of the acidic gases from hydrogenation is a bit high, which causes ethanolamine to foam when it enters the desulfurization unit. However, we carry out liquid removal from the raw gas buffer tank on a daily basis, yet this does not effectively solve the problem； Another issue is that the PID parameters of the control valve in the regeneration tower are not quite appropriate; after trying several times, the level remained stable for a while, but overall, the liquid level still fluctuates frequently. I’m not sure what the situation is like in your plant. I hope experts can discuss this topic together – thank you all for your participation!