Method of reducing corrosion in a power boiler of a pulp mill
AssigneeKvaerner Pulping AB
InventorsEsa Pikkujamsa, Keijo Salmenoja, Kari Makela, Jouni Kinni
Life of this patent
Estimating the term…
Abstract
Method of reducing corrosion in a power boiler of a pulp mill using biofuel and suspended matter obtained from the waste water treatment of the mill. In the method flue gases obtained from a waste heat boiler are fed into the power boiler, causing the sulfur dioxide contained in them to react with the alkali chlorides in the boiler and the chlorine to form hydrogen chloride.
Claims12
A method of reducing molten phase corrosion in a power boiler of a pulp mill having a separate boiler, the power boiler using fuel that produces alkali chlorides when burned, wherein the method comprises the steps of
- (a) burning in the power boiler biofuel that produces alkali chlorides when burned,
- (b) burning in the separate boiler odor gases originating from a pulping process to obtain flue gases containing sulfur dioxide, and
- (c) feeding said flue gases containing sulfur dioxide, from the separate boiler, into the power boiler burning biofuel, so that sulfur dioxide in said flue gases reacts with alkali chlorides to yield hydrogen chloride in the power boiler.
The method of any preceding claim wherein the separate boiler is a waste heat boiler.
A method of reducing molten phase corrosion in a power boiler of a pulp mill having a separate boiler, the power boiler using as fuel biofuel and suspended matter obtained from waste water treatment of the pulp mill, so that alkali chlorides are produced in the power boiler, wherein the method comprises the steps of
- (a) burning in the power boiler biofuel and suspended matter obtained from waste water treatment of the pulp mill, so that alkali chlorides are produced in the power boiler,
- (b) burning in the separate boiler odor gases originating from a pulping process to obtain flue gases containing sulfur dioxide, and
- (c) feeding said flue gases containing sulfur dioxide, from the separate boiler, into the power boiler burning biofuel, so that sulfur dioxide in said flue gases reacts with alkali chlorides to yield hydrogen chloride in the power boiler.
Dependencies are inferred from the claim text.