Kraft recovery boiler operation with splash plate and/or beer can nozzles —  a case study, TAPPI Journal October 2021



 Application: CFD modeling can be used for better understanding of boiler process and furnace behavior with different liquor spray scenarios before actual modifications. Also, the most suitable liquor spray scenario can be identified with CFD modeling in terms of number/type/location of splash plate nozzles and beer can nozzles.

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Author: Viswamoorthy Raju, Markus Engblom, Eetu Rantala, Sonja Enestam, and Jarmo Mansikkasalo
Kraft recovery boiler operation with splash plate and/or bee
ABSTRACT: In this work, we study a boiler experiencing upper furnace plugging and availability issues. To improve the situation and increase boiler availability, the liquor spray system was tuned/modified by testing different combinations of splash plate and beer can nozzles. While beer cans are typically used in smaller furnaces, in this work, we considered a furnace with a large floor area for the study. The tested cases included: 1) all splash plate nozzles (original operation), 2) all beer can nozzles, and 3) splash plate nozzles on front and back wall and beer cans nozzles on side walls. We found that operating according to Case 3 resulted in improved overall boiler operation as compared to the original condition of using splash plates only. Additionally, we carried out computational fluid dynamics (CFD) modeling of the three liquor spray cases to better understand the furnace behavior in detail for the tested cases. Model predictions show details of furnace combus-tion characteristics such as temperature, turbulence, gas flow pattern, carryover, and char bed behavior. Simulation using only the beer can nozzles resulted in a clear reduction of carryover. However, at the same time, the predicted lower furnace temperatures close to the char bed were in some locations very low, indicating unstable bed burning. Compared to the first two cases, the model predictions using a mixed setup of splash plate and beer can nozzles showed lower carryover, but without the excessive lowering of gas temperatures close to the char bed.
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