Method and apparatus for increasing recovery boiler capacity by

Details Method and apparatus for increasing recovery boiler capacity by Method and apparatus for increasing recovery boiler capacity by

1996-02-05

1997-11-04

Czaja, Donald E.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 31, 48197R, 48209, 110203, 110204, 110238, D21C 1112, F23G 704

Patent

active

056835507

ABSTRACT:
A method and system for treating waste liquors from pulping processes for recovering energy and chemicals from the waste liquors (such as kraft black liquor). A recovery boiler having a furnace for combusting waste liquor includes a plurality of injection nozzles in the furnace walls, for injecting waste liquor into the furnace. At least one conduit is disposed in at least one wall of the furnace below the nozzles for withdrawing a portion of the combustible gas from the furnace. Typically between about 10-50% of the combustible gas produced in the furnace is withdrawn through the conduit or conduits below the nozzles, and the withdrawn gas is cooled and purified. The system may utilize a superheater which is separate and distinct from the recovery boiler, the cleaned and cooled withdrawn gas led to the separate superheater.

REFERENCES:
patent: 2606103 (1952-08-01), Hamm
patent: 4011129 (1977-03-01), Tomlinson
patent: 4135968 (1979-01-01), Dehaas
patent: 4739729 (1988-04-01), Rettemeier et al.
patent: 4808264 (1989-02-01), Kignell
patent: 4878441 (1989-11-01), Ryham
patent: 4930429 (1990-06-01), Ryham
patent: 5340440 (1994-08-01), Henricson
"A Comparison of Alternative Black Liquor Recovery Technologies", Grace and Timmer, 1995 International Chemical Recovery Conference, pp. B-269-B-275.

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