Ash Modification in Black Liquor Recovery Boilers Through the Use of Chemicals, 2001 Engineering / Finishing & Converting Conference Proceedings
J. Lutzmann, S. Lavallée--This paper deals with ash modification to reduce ash deposit accumulation in the superheater and generating bank
elements of chemical recovery boilers. A blend of earth alkaline and transition metal oxides and salts, injected into
the boiler at strategic locations in the oxidising zone, in equal volumes at predetermined intervals, will achieve the
following objectives.
1. Every injection will create a layer of ash that has thermal properties, which are completely different from those
of untreated ash, (cleavage plane).
2. Render the ash more porous and friable.
3. Through the accumulation of transition metal oxides in the ash, oxidation catalysis occurs in the upper region of
the furnace to help complete the combustion of organics, and also complete the oxidation of sulphur species to
Na2SO4. Case histories will be included.
Ash Modification in Black Liquor Recovery Boilers Through the Use of Chemicals, 2001 Engineering / F
