| 摘要 |
Process for optimising the absorbent stoichiometry in the wet desulphurisation of flue gases which are passed as an entire stream, or can be dosed via a feeding device as a part-stream, to the scrubber, by load-dependent control of its separation efficiency using a load signal which is formed in a known manner from the pollutant concentration or amount present in the flue gas and the permitted emission limit, the pH of the scrubbing liquid being used as the controlled variable for dosing the absorbent having the set point adjusted in such a manner that at a normalised load signal of 0.01 to 0.99 and with control of the separation efficiency by load-dependent feed of the flue gas rate, a constant set point of preferably pH = 4-4.5 is established and at full load or maximum value of the manipulated variable for the flue gas flow rate a switch to load-dependent set point control is carried out and the measurement of the pH of the scrubbing liquid preferably being carried out on the suction side of the circulation pumps in the absorbent circulation of the scrubber.
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