Physical Modeling of Flows in Black Liquor Recovery Boilers, 1992 Engineering Conference Proceedings

Flow patterns inside kraft recovery boilers are difficult to measure or visualize directly. As an aid to understanding the flow in actual boilers, detailed velocity measurements have been made using a laser doppler velocimeter in a small-scale physical model of a black liquor recovery boiler. Water at room temperature was used as the fluid in the model, which included representation of the boiler tube bank, but not the smelt bed. For the load-burner (above liquor guns) upper furnace flow arrangement, the central vertical core flow traditionally expected was not observed. An asymmetrical flow pattern dominated, with up-flow near the front and side walls, and down-flow or recirculation elsewhere. This general flow pattern was seen to be insensitive to minor configuration changes in the furnace. Results were essentially independent of total mass flow rate, and contained large amplitude unsteadiness.

Author: Ketler, S.P., Savage, M.C., Gartshore, I.S.
Physical Modeling of Flows in Black Liquor Recovery Boilers,
Physical Modeling of Flows in Black Liquor Recovery Boilers, 1992 Engineering Conference Proceedings
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