Power–gap relationships in low consistency refining

Berna, Jorge Enrique Rubiano; Martinez, Mark; Olson, James A.

doi:10.1515/npprj-2018-0039

Cited by 11 publications

(2 citation statements)

References 18 publications

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“…The disc refining process is a widely used technology in the pulp and paper industry due to its effectiveness in breaking down woody biomass to fibers . Many researchers reported studies on disc refining for pulping processes. − However, it is also an energy-intensive process. Due to the complexity of refiner geometric features and complex flow properties of fiber suspensions, developing a comprehensive predictive computational model for the disc refining process is challenging.…”

Section: Introductionmentioning

confidence: 99%

Impact of Mechanical Refining Conditions on the Energy Consumption, Enzymatic Digestibility, and Economics of Sugar Production from Corn Stover

Li,

Davis,

Tan

et al. 2023

ACS Sustainable Chem. Eng.

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Reducing the energy intensity of the mechanical refining-based pretreatment process for producing lignocellulosicderived sugars without significantly affecting enzymatic hydrolysis sugar yields is challenging. This work investigated the impact of different refining conditions on energy consumption, enzymatic sugar yields, minimum sugar selling price, and environmental impacts for the conversion of corn stover to sugars. A positive proportionate correlation between specific energy consumption and enzymatic sugar yields was observed when changing the refiner plate gap was changed, which agrees with other reported works. However, the correlation between specific energy consumption and enzymatic sugar yields is not straightforward when the rotational speed and refiner plate design change. We observed that, for a corn stover material with low consistency disc refining, specific energy consumption decreased by >50% by decreasing the rotation speed without affecting enzymatic sugar yields. By changing refiner plate designs, a 45% reduction in specific energy consumption could be achieved without affecting the glucose yield, albeit still with a detrimental impact on the xylose yield. Our high-fidelity disc refining model was able to predict the energy consumption for different refiner plate geometry designs and operating conditions. Techno-economic and life-cycle analyses indicate that the plate design and operating conditions have a direct impact on overall process power consumption and sugar yields, with sugar yields strongly dictating the minimum sugar selling price, the life cycle greenhouse gas emissions, and fossil energy consumption. To minimize the environmental impact and maximize process economics, optimization of the mechanical refining process should target maintaining high sugar yields, while lowering refining energy consumption.

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Section: Introductionmentioning

confidence: 99%

Impact of Mechanical Refining Conditions on the Energy Consumption, Enzymatic Digestibility, and Economics of Sugar Production from Corn Stover

Li,

Davis,

Tan

et al. 2023

ACS Sustainable Chem. Eng.

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“…The LC refining process is usually characterized by the refining intensity and specific refining energy. Most refining intensities, such as the specific edge load (SEL) [5] , specific surface load (SSL) [6] , and net normal force or tangential force per bar crossing zone [7] , have been proposed and calculated based on the net power obtained by subtracting the no-load power from the total power [8][9] . This indicates that the accurate measurement or calculation of net power is important for controlling LC refining.…”

Section: Introductionmentioning

confidence: 99%

Effect of Refiner Plate Bar Angle and Pulp Properties on the Low Consistency Refining Efficiency in Terms of Power Consumption

Liu,

Dong,

et al. 2023

Paper and Biomaterials

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Power consumption is the energy source of the impact on fibers or pulp during low-consistency (LC) pulp refining, and the strength of refining affects refining quality and efficiency. The pulp properties, operating parameters, and bar parameters of the refiner plates are important parameters affecting refining efficiency, which can be defined as the ratio of net to total refining power. In this study, LC refining trials for pulps with different consistencies and fiber lengths were conducted using five isometric straightbar plates with different bar angles to explore the influences of the plate bar angle and pulp properties on the no-load power, impact capacity on fibers and refining efficiency. It was found that the no-load power of the LC refining process decreased with an increase in the plate bar angle while increased when pulp with higher consistency was refined under the same refining conditions. However, the effect of pulp consistency on the no-load power can be neglected when refining is conducted using plates with larger bar angles.Meanwhile, a critical bar angle for straight-bar plates in LC refining may exist, which has the strongest impact on the pulp and highest refining efficiency under the same refining conditions. In addition, the impact

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Refining Operating Variables

Manfredi

2024

Eucalyptus Kraft Pulp Refining

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Power–gap relationships in low consistency refining

Cited by 11 publications

References 18 publications

Impact of Mechanical Refining Conditions on the Energy Consumption, Enzymatic Digestibility, and Economics of Sugar Production from Corn Stover

Impact of Mechanical Refining Conditions on the Energy Consumption, Enzymatic Digestibility, and Economics of Sugar Production from Corn Stover

Effect of Refiner Plate Bar Angle and Pulp Properties on the Low Consistency Refining Efficiency in Terms of Power Consumption

Refining Operating Variables

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