How to deal with an increased pressure difference in the dry gas desulfurization tower
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Dear experts: The pressure difference in the dry gas desulfurization tower at our facility has been increasing recently, showing regular fluctuations between 35–75 Kpa. This has resulted in some rich liquid entering the fuel gas system, thereby causing fluctuations in sulfur dioxide levels in the heater. After evaluation, it was determined that the excessive impurities in the lean liquid were caused by their accumulation inside the desulfurization tower. What I would like to ask is whether there are any good ways to treat the desulfurization tower while it is in operation. I earnestly hope that the experts here will step in to help.
We perform solvent purification on a quarterly basis, and ensure an appropriate ratio between gas and liquid. We prevent the dry gas tower from operating under overload conditions; when an increase in pressure difference is detected, we reduce the flow rate of the lean liquid to lower the processing volume!
Take a sample of the amine solution, let it stand, shake it vigorously, and then observe the time it takes for the foam to disappear; if this time is more than 20 seconds, foaming is considered to occur. A high pressure difference in the desulfurization tower is mainly caused by solvent foaming; an antifoaming agent can be added to the tower. Another possibility is that the desulfurization tower’s processing capacity exceeds its limit