Method of recovering energy from waste liquors from pulp processes
AssigneeA. Ahlstrom Corporation
InventorsMarjo Kuusio, Samuli Nikkanen
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Abstract
Method of recovering energy from waste liquors from pulp processes, wherein the waste liquor is burned in a waste liquor recovery boiler and energy is recovered from the flue gases by producing saturated or partially superheated steam in the recovery boiler. According to the invention, a portion of the waste liquor is gasified in a gasifying reactor in order to produce combustion gas. The combustion gas is burned in a separate superheating boiler, in which the steam produced in the recovery boiler is superheated.
Claims18
A method of recovering energy from waste liquors from cellulose pulp processes, utilizing a recovery boiler and a superheating boiler, and comprising the steps of:
- (a) dividing a main stream of waste liquor from cellulose pulp processing into first and second streams;
- (b) combusting the first stream of waste liquor in the recovery boiler to produce steam, and feeding the steam so produced to the superheating boiler;
- (c) gasifying the second stream of waste liquor to produce a combustion gas and an inorganic fraction;
- and
- (d) burning said combustion gas from step (c) in the superheating boiler to superheat the steam from step (b), the combustion gas from step (c) providing substantially the only source of fuel for superheating the steam in the superheating boiler;
- and wherein step (d) is practiced to superheat the steam to a pressure of 100 bar or greater and a temperature of greater than 520.degree. C.
Dependencies are inferred from the claim text.