External drainage of flue gas desulfurization system in catalytic unit
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May I ask the experts: What is the reason that the water in the flue gas desulfurization tower of the catalytic unit turns red after being oxidized by the oxidation air in the PTU system? How can I diagnose and resolve this? Please provide guidance
The water in the flue gas desulfurization system of catalytic devices appears red, usually because it contains oxidized iron ions (such as Fe2+ being oxidized to Fe3+), which causes the water to turn red. This phenomenon is common during the oxidation process, as iron and other metal elements may originate from equipment corrosion or impurities in the raw materials. This problem can be addressed from the following aspects: 1. **Inspect and maintain equipment**: Regularly check whether equipment such as pipes and containers in the processing system show any signs of corrosion. Replace or repair the damaged parts to prevent metal impurities from entering the system. 2. **Optimize operating conditions**: Adjust the operating parameters of the PTU system, such as the flow rate of the oxidation air and the reaction time, to ensure complete oxidation while preventing other problems caused by excessive oxidation. 3. **Water quality management**: Strengthen the control of water quality at the inlet to ensure that it meets the standards before treatment, thereby reducing the influx of potential pollutants. 4. **Add treatment agents**: It is possible to consider adding an appropriate amount of flocculants or precipitants to the system to help precipitate heavy metals such as iron ions, thereby removing the red substances from the water. 5. **System Cleaning**: Perform regular system cleaning to remove contaminants and corrosion products that accumulate within the system, thereby keeping the equipment and system clean. By implementing the above measures, the problem of red-colored wastewater from the flue gas desulfurization system can be effectively resolved. If the problem persists, professional chemical analysis may be required to further determine the cause of the issue and take targeted action. .
In addition to what Kawayu mentioned above, I would like to add a bit more: by checking the Fe content in the feed, it is possible that the properties of the feed have changed, resulting in an increase in iron content.
Over-oxidation is also a possibility; reducing the amount of alkali injected or the amount of air injected could be tried