Arrangement for feeding black liquor into a recovery boiler
AssigneeAndritz Inc.
InventorsAntti Hytönen, Pentti Piilonen, Esa Vakkilainen
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Abstract
The present invention relates to an arrangement for introducing black liquor into a furnace of a recovery boiler, said arrangement comprising an elongated tube having an interior surface and an exterior surface, through which tube the black liquor being fed into the furnace is supplied, whereby the black liquor is taken into contact with said interior surface prior to being sprayed into the furnace. The interior surface of said elongated tube is provided with heat transfer elements and surfaces, such as fins or grooves. The heat transfer element or surface increases the heat conductivity between the tube and the black liquor above the conductivity achieved with a normal tube passage.
Claims21
An arrangement for introducing black liquid into a furnace of a recovery boiler, said arrangement comprising an elongated tube having an interior surface and an exterior surface, through which tube the black liquor being fed into the furnace is supplied, wherein the interior surface of the elongated tube is provided with heat transfer elements and surfaces for cooling the tube, and whereby the black liquor is made to contact with said interior surface prior to spraying it into the furnace.
A method for introducing black liquor into a furnace of a recovery boiler comprising the steps of:
- (a) passing the black liquor through an inlet passage to the boiler;
- (b) cooling the inlet passage by transferring heat between the inlet and the black liquor, wherein a rate of the heat transfer is increased by heat transfer surfaces of the passage in contact with the black liquor and the rate is greater than a rate of heat transfer achieved in an inlet passage without heat transfer surfaces, and
- (c) injecting the black liquor into the boiler.
Dependencies are inferred from the claim text.