Method of recovering energy from waste liquors from pulp process

Details Method of recovering energy from waste liquors from pulp process Method of recovering energy from waste liquors from pulp process

1996-04-18

1998-01-13

Czaja, Donald E.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Including recovery of organic by-product

162 31, 110238, D21C 1112

Patent

active

057074909

ABSTRACT:
A method of recovering energy from waste liquors from cellulose pulp processes produces high quality superheated steam, a savings in material costs is achieved, and the utilization factor of the pulp mill is improved (that is the number of shutdowns for service is reduced). A main stream of waste liquor from cellulose pulp processing is divided into first and second streams. The first stream is combusted in the recovery boiler to produce steam and the steam is fed to a superheating boiler. The second stream of waste liquor is gasified outside the recovery boiler to produce a combustible gas and an inorganic fraction. The inorganic fraction is not fed to the recovery boiler, but is separately recovered. The combustible gas is burned in the superheating boiler to superheat steam produced from combusting the first stream of waste liquor, the combustible gas providing substantially the only source of fuel for superheating the steam in the superheating boiler.

REFERENCES:
patent: 2606103 (1952-08-01), Hamm
patent: 2840454 (1958-06-01), Tomlinson et al.
patent: 4135968 (1979-01-01), Dehaas
patent: 4953607 (1990-09-01), Erkki et al.
patent: 5201172 (1993-04-01), Hakulin et al.

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