Flue gas resistance issue

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Question: We have several desulfurization units here, but their operating parameters vary. It seems that one of the desulfurization systems has high resistance. Please help analyze this situation: The other operating parameters of the two desulfurization units are basically the same, including an unit load of around 500MW, as well as flue gas volume and temperature. However, the outlet pressure of the booster fans differs – it is around 1500 Pa for one unit and around 2000 Pa for the other. The absolute pressure at various measurement points is relatively high, while the pressure difference across the demister remains more or less constant. I suspect there is a problem with the chimney, or there is high resistance at the junction between the exhaust flue and the chimney. What’s going on? Urgent help needed, phone number: 15049198563