Black liquors can be treated with pure oxygen to oxidise sodium sulphide up to the stable compound sodium thiosulphate. This way, it reduces emissions of total reduced sulphur (TRS) in the recovery boiler. This application can also reduce the liquor heating value and increase the recovery boiler capacity.
Application of pure oxigen converts sulphide sodium
Thiosulphate sodium and decrease calorific liquor value leading to an increased
productivity in the bottleneck production recovery boilers (indirect concentrators).
Oxidation of sulphur coumpound (mercaptans/ H2S).
TRS reduction.
A better use of heat generated in the exothermic reaction.
Saved steam evaporators; Shorter reaction and less foam generation than with air.
Increased productivity 2 to 4%.
Increases S and Na recovering in the green liquor.
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