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Effect of flow dispersion in a D0 bleaching tower evaluated by a simplified CFD model combined to a delignification kinetic model, 2011 International Pulp Bleaching Conference
Effect of flow dispersion in a D0 bleaching tower evaluated by a simplified CFD model combined to a delignification kinetic model, 2011 International Pulp Bleaching Conference
OPTIMIZATION OF AN ECF BLEACH PLANT â?¢ A MILL EXAMPLE, 2011 International Pulp Bleaching Conference
OPTIMIZATION OF AN ECF BLEACH PLANT • A MILL EXAMPLE, 2011 International Pulp Bleaching Conference
The Effects of Xylanase and Acid Pre-treatments on ECF Bleaching of Tobacco Stalk Soda-AQ Pulp, 2011 International Pulp Bleaching Conference
The Effects of Xylanase and Acid Pre-treatments on ECF Bleaching of Tobacco Stalk Soda-AQ Pulp, 2011 International Pulp Bleaching Conference
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Numerical analysis of the impact of rotor and screen hole plate design on the performance of a vertical pulper, TAPPI Journal April 2025
ABSTRACT: The dissolving of mechanical pulp is one of the most important process steps in stock preparation, since pulping occurs at the very beginning of the papermaking process. Efficient mixing of the pulp in a short amount of time is essential to achieve high furnish volume flow rates. The design of the rotor, as well as the pulper vat and inserts, significantly affects the overall performance of the pulper, such as mixing efficiency and power demand. Using advanced numerical methods such as computational fluid dynamics (CFD) can accelerate the development process. The CFD simulations allow for detailed analysis of flow phenomena, making it possible to study a real-size machine numerically. This approach is particularly advantageous because it can reduce the need for timeconsuming and costly experiments associated with scaling up test rigs. In this study, we compared two different rotor designs utilized in a vertical pulper and evaluated the numerical results with experimental data. Rotor A is designed for low turbulence and low power demand, while rotor B is designed for high turbulence with high power demand. The CFD results showed good agreement with the experimental measurements. We investigated how the rotor design influences the free fluid surface and the mixing efficiency. Our study also highlights the differences in results depending on whether water or furnish is simulated, which exhibit Newtonian or, respectively, non-Newtonian fluid behavior. Additionally, a detailed numerical investigation of various screen hole plate designs revealed that the newly developed hole design significantly reduces pressure loss compared to a standard drilled hole. This outcome was consistent for both types of fluids investigated: water and furnish.
Alternative Fuel Impact on Lime Reburning Kiln Performance, 2008 Engineering, Pulping and Environmental Conference
Alternative Fuel Impact on Lime Reburning Kiln Performance, 2008 Engineering, Pulping and Environmental Conference
Water Use and Effluent Treatment in Canadian High Yield Pulp Mills, 2008 Engineering, Pulping and Environmental Conference
Water Use and Effluent Treatment in Canadian High Yield Pulp Mills, 2008 Engineering, Pulping and Environmental Conference
Co-firing biomass with coal in CFB boilers, 2008 Engineering, Pulping and Environmental Conference
Co-firing biomass with coal in CFB boilers, 2008 Engineering, Pulping and Environmental Conference
CURRENT STATUS OF ALTERNATIVE FUEL USE IN LIME KILNS, 2008 Engineering, Pulping and Environmental Conference
CURRENT STATUS OF ALTERNATIVE FUEL USE IN LIME KILNS, 2008 Engineering, Pulping and Environmental Conference
Deinking of Flexographic Newsprint, 2008 Engineering, Pulping and Environmental Conference
Deinking of Flexographic Newsprint, 2008 Engineering, Pulping and Environmental Conference
Dewpoint Corrosion of a Coastal Biomass Power Boiler Air Heater, 2008 Engineering, Pulping and Environmental Conference
Dewpoint Corrosion of a Coastal Biomass Power Boiler Air Heater, 2008 Engineering, Pulping and Environmental Conference