pH control in the absorption tower (scrubber) for flue gas desulfurization using the sodium (alkali) method
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What are the techniques for controlling the pH value in the absorption tower (scrubber) used for flue gas desulfurization via the sodium (alkali) method? What issues need attention?
It is mainly necessary to keep it within a reasonable range; values above 10 can cause scaling in the pipelines, and the pH of the treated wastewater will not meet the standards. If the value is too low, it can lead to acidic corrosion of the equipment.
A pH meter is installed at the inlet of the spray pump to monitor the pH value in real time; 30% alkaline solution is continuously injected via a metering pump to keep the pH of the spray liquid between 7.5 and 8.5. If the sulfur content in the flue gas changes, the amount of alkaline solution injected should be adjusted accordingly.
This control is adjusted based on the value read by the online pH meter, by modifying the amount of alkali solution injected to achieve control