Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1980-11-20
1983-03-22
Chin, Peter
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
122 7C, 162 3011, 162 47, 423207, 423DIG3, 432 15, D21C 1112
Patent
active
043774393
ABSTRACT:
A recovery system for residual liquor from a pulp mill, utilizing a fluidized bed to burn the organic material in the residual liquor and generate heat which may be recovered. Heat preferably from the flue gases is used to dry residual liquor sprayed to pellets extracted from the bed, thereby to provide pellets coated with dried residual liquor. The so coated and dried pellets are then reinjected into the bed and the organic material in the dried residual liquor is burned to generate the heat recovered from the bed.
If the residual liquor is from a kraft mill sulfur compounds are in the form of sulfate and must be reduced to sulfide and a reducing stage will also be provided either in the reducing zone in existing conventional kraft system (if capacity is available) or in a separate reducing zone and some of the pellets from the bed may be directed to the reducing zone together with some of the pellets coated with dried residual liquor. Heat may be supplied to the reducing zone via an auxiliary fuel and reducing gases may also be supplied but preferably the ratio of carbon to pellets or the required temperature in the reducing zone will be obtained by the ratioing of caated and uncaated pellet fed to the reducing zone and the reduced material is withdrawn therefrom while the gases from the reducing zone are directed to the bed to complete their oxidation and generated heat.
REFERENCES:
patent: 3523864 (1970-08-01), Osterman et al.
patent: 3657064 (1972-04-01), Shick
patent: 4011129 (1977-03-01), Tomlinson
patent: 4154643 (1979-05-01), Cook et al.
patent: 4244779 (1981-01-01), Nieminen et al.
patent: 4312702 (1982-01-01), Tomlinson
Chin Peter
Domtar Inc.
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