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Understanding the energy and emission implications of new technologies in a kraft mill: Insights from a CADSIM Plus simulation model, TAPPI Journal June 2024

ABSTRACT: Kraft mills play a vital role in energy transition because they have significant potential to reduce their own energy utilization and produce energy/products to decarbonize other sectors. Through biomass combustion and potential biogenic carbon emissions capture, these mills can contribute to offsetting emissions from other sectors. This research investigates the departmental and cross-departmental implications of technology upgrades on energy, steam, emissions, water, and chemicals using a CADSIM Plus simulation model. The model provides a comprehensive analysis of mass and energy balances, offering valuable insights into the benefits and limitations of each technology. The model facilitates scenario analysis and comparisons of process configurations, enabling data-driven decision-making for sustainable and competitive operations. Six high-impact technologies, including additional evaporator effects, weak black liquor membrane concentration, belt displacement washer for brownstock washing, oxygen delignification, and improvements to the pulp machine shoe press and vacuum pumps, are evaluated. Individual technologies resulted in energy savings of 1.2% to 5.4%, biomass consumption reductions of 8.6% to 31.6%, and total emissions reductions of 1.6% to 5.9%. Strategic decision-making must consider existing mill limitations, future technology implementation, and potential production increases. Future research will explore product diversification, biorefineries, and pathways to achieve carbon-negative operations, aiming to reduce emissions and secure a competitive future for kraft mills.

Effect of high sulfate content on viscosity of recovery boiler molten smelt, TAPPI Journal March 2024

ABSTRACT: A systematic study was conducted to examine the effect of high sulfate content on the freezing temperature of molten smelt and how this may contribute to the formation of viscous jellyroll smelt in recovery boilers. The results show that even for recovery boilers with a smelt reduction as low as 70%, the sulfate content in smelt has no or little effect on smelt freezing temperature, and hence, on molten smelt fluidity. The perceived adverse effect of high sulfate content on smelt fluidity and on jellyroll smelt formation comes from the high sulfate content in deposits that have fallen from the upper furnace. Fallen deposits may or may not form jellyroll smelt, depending on whether or not they can melt and be well-mixed with molten smelt by the time they reach the smelt spouts. It is not the high sulfate content in smelt resulting from the low smelt reduction efficiency that makes molten smelt viscous and forms jellyroll smelt, but rather, it is the incomplete melting of fallen deposits that results in one of the proposed mechanisms for jellyroll smelt formation.

SetPoint: Making Things Happen, Paper360º March/April 2024

On management: energy and the pulp and paper industry - how will electric utility deregulation affect You?, TAPPI JOURNAL, March 1998, Vol. 81(3)

On management: energy and the pulp and paper industry - how will electric utility deregulation affect You?, TAPPI JOURNAL, March 1998, Vol. 81(3)

TAPPI JOURNAL May 1998; Vol. 81; No. 5 - Respiratory Health Problems Associated With Worker Exposure to Fungi on Wood and Wood Chips, TAPPI JOURNAL, May 1998, Vol. 81(5)

TAPPI JOURNAL May 1998; Vol. 81; No. 5 - Respiratory Health Problems Associated With Worker Exposure to Fungi on Wood and Wood Chips, TAPPI JOURNAL, May 1998, Vol. 81(5)

Growth and Decay of Streaks and Waves on the Forming Table, TAPPI JOURNAL, May 1998, Vol. 81(5)

Growth and Decay of Streaks and Waves on the Forming Table, TAPPI JOURNAL, May 1998, Vol. 81(5)

Roll deformation during blade coating, TAPPI JOURNAL, May 1998, Vol. 81(5)

Roll deformation during blade coating, TAPPI JOURNAL, May 1998, Vol. 81(5)

Wood and how it relates to paper products, TAPPI JOURNAL, May 1998, Vol. 81(5)

Wood and how it relates to paper products, TAPPI JOURNAL, May 1998, Vol. 81(5)

Determination of within-tree variation of kraft pulp yield using near-infrared spectroscopy, TAPPI JOURNAL, May 1998, Vol. 81(5)

Determination of within-tree variation of kraft pulp yield using near-infrared spectroscopy, TAPPI JOURNAL, May 1998, Vol. 81(5)

Factors controlling the passage of fibers through slots, TAPPI JOURNAL, May 1998, Vol. 81(5)

Factors controlling the passage of fibers through slots, TAPPI JOURNAL, May 1998, Vol. 81(5)