Issue of tray opening ratio in the stripping tower

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Hello, everyone! Our plant uses a single-tower pressurized side-line extraction process for the acid water stripping. Following capacity expansion upgrades, all the trays in the stripping tower were replaced; the opening ratio is 4.03% for trays 1–14, 6.28% for trays 15–16, and 11.42% for trays 17–49. The amount of acidic gas at the tower top is low, which often leads to tower flooding. The sulfide content in the purified water is high, ranging between 80 and 100. The tertiary condensation cooling effect for ammonia in the side line is poor, with high temperatures and pressures at each stage, preventing effective cooling. These issues are attributed to a low opening ratio of the upper trays in the tower. The sulfide content in our feed water is 5000 mg/m3, and the ammonia nitrogen content is 7000 mg/m3. I would appreciate it if you could help me assess this situation, as well as provide information on the opening rate of each tray and the properties of the feed water. Thank you!