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Journal articles
Open Access
Shookumchuck Mill Readies for the Future

Shookumchuck Mill Readies for the Future

Journal articles
Open Access
Visual recovery boiler inspection, TAPPI JOURNAL, December 1994, Vol. 77(12)

Visual recovery boiler inspection, TAPPI JOURNAL, December 1994, Vol. 77(12)

Journal articles
Open Access
Upgraded recovery boiler meets low air emissions standards, TAPPI JOURNAL, December 1994, Vol. 77(12)

Upgraded recovery boiler meets low air emissions standards, TAPPI JOURNAL, December 1994, Vol. 77(12)

Journal articles
Open Access
Bimodal fume particle size distributions from recovery boiler and laboratory scale black liquor combustion, TAPPI JOURNAL, December 1994, Vol. 77(12)

Bimodal fume particle size distributions from recovery boiler and laboratory scale black liquor combustion, TAPPI JOURNAL, December 1994, Vol. 77(12)

Journal articles
Open Access
Influence of voids on the engineering constants of paper par

Influence of voids on the engineering constants of paper part 2: void modeling, TAPPI JOURNAL, December 1994, Vol. 77(12)

Journal articles
Open Access
Environmental compatibility of effluents of aspen biomechanical pulps, TAPPI JOURNAL, January 1994, Vol. 77(1)

Environmental compatibility of effluents of aspen biomechanical pulps, TAPPI JOURNAL, January 1994, Vol. 77(1)

Journal articles
Open Access
The use of xylanases in kraft pulp bleaching: a review, TAPPI JOURNAL, June 1994, Vol. 77(6)

The use of xylanases in kraft pulp bleaching: a review, TAPPI JOURNAL, June 1994, Vol. 77(6)

Journal articles
Open Access
Stainless steel piping for pulp handling and chemical recovery, TAPPI JOURNAL, June 1994, Vol. 77(6)

Stainless steel piping for pulp handling and chemical recovery, TAPPI JOURNAL, June 1994, Vol. 77(6)

Journal articles
Magazine articles
Open Access
Crossflow filtration of green liquor for increased pulp production, improved green liquor quality, and energy savings, TAPPI JOURNAL October 2020

ABSTRACT: A new green liquor filtration system has been installed and commissioned at the Ence pulp mill in Pontevedra, Spain. The filtration system is based on microfiltration and was developed in collaboration with the KTH Royal Institute of Technology in Stockholm, Sweden. The patented method for efficient purification of green liquor decreases the non-process element (NPE) content by providing more efficient solids/liquid separation, reducing energy and chemical consumption in pulp mills and increasing production capacity by eliminating certain capacity bottlenecks. The process has been continuously tested at the Aspa Bruk Mill outside Askersund, Sweden, since 2013. The technology has proven to create nearly particulate-free green liquor during the purification process. The technology can also be used to polish white liquor to provide higher pulp quality.To provide for a simple and cost-effective installation, the system was designed as a skid-mounted unit that is pre-piped, instrumented, and tested before shipment. The system is modular and allows for easy expansion of capacity. This paper discusses the process design, process integration, and startup of the new system, along with experiences from the first months of operation.

Journal articles
Magazine articles
Open Access
Using bleaching stage models for benchmarking hardwood ECF bleach plants, TAPPI Journal October 2023

ABSTRACT: Steady-state models estimated the performance of the D0(EOP)D1 bleach sequence at two mixed hardwood bleach plants in the southern United States. At Mill 1, the full sequence’s chlorine dioxide charge that brightens the pulp to ~84% ISO was monitored for two weeks. Mill 2 considered the partial sequence that brightens the pulp to ~86% ISO for nearly four weeks. Elevated levels of chlorine dioxide were linked to increased washer carryover in brownstock and extraction areas. For Mills 1 and 2, an extra 0.24% and 0.33% chlorine dioxide was consumed in the D0 stage. This extra bleach demand was equivalent to an additional 4.8 and 5.5 kappa load to the brownstock, respectively. Some differences were observed for the D1 stage. Mill 1 had extraction carryover that averaged 1.1 units higher than was measured, contributing to use of an extra 0.22% of chlorine dioxide. Mill 2 had extraction carryover that averaged between 0 and 0.7 kappa units and consumed up to 0.13% more chlorine dioxide. Another data set from Mill 2 showed high brownstock and extraction carryover, leading to ~0.90% more total chlorine dioxide usage to brighten to 84% ISO. Overall, this investigation illustrated that the models could be employed as benchmarks.

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