Method of controlling a wet scrubber useful for removing sulphur dioxide from a process gas
AssigneeALSTOM Technology Ltd
InventorsFredrik Jens Brogaard, Kerstin Forsgren, Mikael Larsson, Rikard Håkansson
Life of this patent
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Abstract
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 sulphite 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 sulphite sensor (68, 74) and to control, based on the measured sulphite concentration, at least one wet scrubber operating parameter influencing the sulphite concentration in the absorption liquid.
Claims15
A method of controlling a wet scrubber used to clean a process gas containing sulphur dioxide, the method comprising:
- contacting the process gas with an absorption liquid in an absorption vessel to absorb sulphur dioxide from the process gas;
- measuring a concentration of sulphite in the absorption liquid to obtain a sulphite concentration measurement;
- and
- controlling, based on the sulphite concentration measurement, at least one scrubber operating parameter influencing the concentration of sulphite in the absorption liquid.
A method according to claim 14, further comprising:
- comparing the sulphite concentration measurement to a set point therefor;
- and
- effecting, when the sulphite concentration measurement is below the set point, an increase of a pH of the absorption liquid accompanied by at least one of:
- reducing a liquid to gas ratio in the absorption vessel;
- and
- reducing a supply of an absorption enhancing additive to the absorption liquid.
A wet scrubber for cleaning a process gas containing sulphur dioxide, the wet scrubber comprising:
- an absorption vessel for contacting the process gas with an absorption liquid to absorb sulphur dioxide from the process gas;
- a sulphite sensor for measuring a sulphite concentration in the absorption liquid to obtain a sulphite concentration measurement;
- and
- a control unit to receive a sulphite concentration measurement signal from the sulphite sensor and to control, based on the sulphite concentration measurement, at least one wet scrubber operating parameter influencing the sulphite concentration in the absorption liquid.
Dependencies are inferred from the claim text.