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New enzymatic technology proves effective in unbleached Kraft, 2021 TAPPICon Live (21TAPL)

New enzymatic technology proves effective in unbleached Kraft, 2021 TAPPICon Live (21TAPL)

How You Operate an Asset Impacts its Reliability • Identify the Risk Now!, 2021 TAPPICon Live (21TAPL)

How You Operate an Asset Impacts its Reliability • Identify the Risk Now!, 2021 TAPPICon Live (21TAPL)

Heat Recovery Systems, 2021 TAPPICon Live (21TAPL)

Heat Recovery Systems, 2021 TAPPICon Live (21TAPL)

Discrete Element Method to Model Tension and Bending for Single Layer 3-Dimension Systems with Bimodal and Pseudo-Full Particle Size Distributions of Spherical Particles, 2021 TAPPICon Live (21TAPL)

Discrete Element Method to Model Tension and Bending for Single Layer 3-Dimension Systems with Bimodal and Pseudo-Full Particle Size Distributions of Spherical Particles, 2021 TAPPICon Live (21TAPL)

Comprehensive Performance Tests of the Paper Product Formation and Surface Appearance Quality Analysis and Classification System, 2021 TAPPICon Live (21TAPL)

Comprehensive Performance Tests of the Paper Product Formation and Surface Appearance Quality Analysis and Classification System, 2021 TAPPICon Live (21TAPL)

Efficient Management of Fines in the Stock Flow prior to Headbox in Paper, Board and Tissue Production, 2021 TAPPICon Live (21TAPL)

Numerical Simulation of a Low Consistency Single-Disc Refiner including Analysis of Experimental Rheological Data, 2021 TAPPICon Live (21TAPL)

Effects of agitator blade scaling on mixing in dissolving tanks, TAPPI Journal April 2022

ABSTRACT: Hard calcium carbonate scale often forms on the agitators in smelt dissolving tanks. The effects of this scale on mixing are not well understood. While mixing in tanks has often been modeled in the literature, there have been no studies involving agitator scaling. To better understand the impact of agitator scaling on hydrodynamics and tank concentrations, a steady state, three-dimensional (3D) model has been developed for a smelt dissolving tank at a kraft pulp mill. In this work, four cases are compared: an agitator with no scaling, mild scaling, moderate scaling, and extreme scaling. The extreme scaling case is representative of scale buildup on a dissolving tank agitator that was significant enough that the agitator had to be stopped and cleaned. The reduction in the agitator fluid jet velocity is relatively small for the mild and moderate scaling cases, but it becomes more significant for the extreme scaling case, for which the results indicate that the mixing of the smelt with the weak wash is likely poor and that there would thus be a risk of smelt pooling.

Effects of rings on flow and temperature in lime kilns, TAPPI Journal June 2022

ABSTRACT: A steady state, two-dimensional (2D) axisymmetric model has been developed to help understand how rings form and grow in a typical lime kiln. Rings of varying length, thickness, and geometry at the front and back faces were modeled to study the effects on flue gas flow and temperature. The results show that ring growth causes the gas velocity to increase and insulates the adjacent refractory, resulting in a lower kiln shell temperature. The results also reveal the formation of recirculation zones immediately down-stream of the rings, as well as temperature deviations upstream and downstream of the rings that might promote recarbonation and further ring growth. The model was applied to a kiln from a kraft mill with front-end and mid-kiln rings and good agreement was obtained between the measured and predicted kiln shell temperatures, providing confidence in the modeling.

Pulp Bleaching, 2011 International Pulp Bleaching Conference

Pulp Bleaching, 2011 International Pulp Bleaching Conference