Why does the pH value of the washing liquid in the flue gas desulfurization and denitrification unit’s desulfurization tower increase?
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This post was last edited by liaifeng on 2018-8-4 at 19:01. In the flue gas desulfurization and denitrification system, the pH value of the washing liquid at the bottom of the tower is around 7; after this washing liquid enters the PTU clarifier and flocculants and coagulants are added, the pH value rises to around 8 (flocculants and coagulants are weakly acidic or neutral in nature). What is causing this? Rewards for correct answers
Theoretically, the pH value should only decrease after the absorption of sulfides, and that’s indeed what happens in our device. Could this be caused by flocculants and coagulants? Are there any quality issues with these flocculants and coagulants?
It’s good for the pH value to rise to around 8, as this reduces the amount of alkali (ammonia) that needs to be used.
It should be caused by flocculants and coagulant aids
There is no problem with the flocculants or coagulants, nor is it due to an excessive amount of alkaline solution added. Similar situations occur in other flue gas desulfurization and denitrification systems; the cause just cannot be identified.
Both the flocculants and coagulants were provided by the research institute, so there should be no problem
We use wet flue gas desulfurization and denitration, with an alkaline solution at 30% concentration being used