A method of controlling a wet scrubber useful for removing sulphur dioxide from a process gas

摘要

A wet scrubber (1) for cleaning a process gas containing sulphur dioxide comprises an absorption vessel (2) for contacting the process gas with an absorption liquid to absorb sulphur dioxide from the process gas, a sensor (68,74) for measuring a sulphite concentration in the absorption liquid, and a control unit (52). The control unit (52) is adapted to receive a measurement signal from the sensor (68, 74) and to control, based on the measured sulphite concentration, at least one wet scrubber operating parameter influencing the concentration in the absorption liquid.