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Journal articles
Open Access
A low residual toxicity microbiological control program, TAPPI JOURNAL, December 1997, Vol. 80(12)

A low residual toxicity microbiological control program, TAPPI JOURNAL, December 1997, Vol. 80(12)

Journal articles
Open Access
Millwide methanol balances: predicting and evaluating hap emissions by utilizing process simulation techniques, TAPPI JOURNAL, February 1997, Vol. 80(2)

Millwide methanol balances: predicting and evaluating hap emissions by utilizing process simulation techniques, TAPPI JOURNAL, February 1997, Vol. 80(2)

Journal articles
Open Access
Page ethanol-kraft pulping and papermaking properties of aspen and spruce, TAPPI JOURNAL, January 1997, Vol. 80(1)

Page ethanol-kraft pulping and papermaking properties of aspen and spruce, TAPPI JOURNAL, January 1997, Vol. 80(1)

Journal articles
Open Access
A novel radial compression testing device for tubes, TAPPI JOURNAL, January 1997, Vol. 80(1)

A novel radial compression testing device for tubes, TAPPI JOURNAL, January 1997, Vol. 80(1)

Journal articles
Open Access
Effect of shear forces on fine particle retention, TAPPI JOURNAL, January 1997, Vol. 80(1)

Effect of shear forces on fine particle retention, TAPPI JOURNAL, January 1997, Vol. 80(1)

Journal articles
Open Access
Paperboard, imports, and exports to fuel 1997 growth, TAPPI JOURNAL, January 1997, Vol. 80(1)

Paperboard, imports, and exports to fuel 1997 growth, TAPPI JOURNAL, January 1997, Vol. 80(1)

Journal articles
Open Access
New developments in synthetic ashrae filtration media, TAPPI JOURNAL, July 1997, Vol. 80(7)

New developments in synthetic ashrae filtration media, TAPPI JOURNAL, July 1997, Vol. 80(7)

Journal articles
Open Access
Elemental chlorine free (ecf) and totally chlorine free (tcf) bleaching of colored broke, TAPPI JOURNAL, July 1997, Vol. 80(7)

Elemental chlorine free (ecf) and totally chlorine free (tcf) bleaching of colored broke, TAPPI JOURNAL, July 1997, Vol. 80(7)

Journal articles
Magazine articles
Open Access
Boiler retrofit improves efficiency and increases biomass firing rates, TAPPI Journal March 2021

ABSTRACT: Domtar’s fluff pulp mill in Plymouth, NC, USA, operates two biomass/hog fuel fired boilers (HFBs). For energy consolidation and reliability improvement, Domtar wanted to decommission the No. 1 HFB and refurbish/retrofit the No. 2 HFB. The No. 2 HFB was designed to burn pulverized coal and/or biomass on a traveling grate. The steaming capacity was 500,000 lb/h from coal and 400,000 lb/h from biomass. However, it had never sustained this design biomass steaming rate. As the sole power boiler, the No. 2 HFB would need to sustain 400,000 lb/h of biomass steam during peak loads. An extensive evaluation by a combustion and boiler technologies supplier was undertaken. The evaluation involved field testing, analysis, and computational fluid dynamics (CFD) modeling, and it identified several bottle-necks and deficiencies to achieving the No. 2 HFB’s biomass steam goal. These bottlenecks included an inadequate combustion system; insufficient heat capture; excessive combustion air temperature; inadequate sweetwater con-denser (SWC) capacity; and limited induced draft fan capacity.To address the identified deficiencies, various upgrades were engineered and implemented. These upgrades included modern pneumatic fuel distributors; a modern sidewall, interlaced overfire air (OFA) system; a new, larger economizer; modified feedwater piping to increase SWC capacity; replacement of the scrubber with a dry electrostatic precipitator; and upgraded boiler controls.With the deployment of these upgrades, the No. 2 HFB achieved the targeted biomass steaming rate of 400,000 lb/h, along with lowered stack gas and combustion air temperatures. All mandated emissions limit tests at 500,000 lb/h of steam with 400,000 lb/h of biomass steam were passed, and Domtar reports a 10% reduction in fuel firing rates, which represents significant fuel savings. In addition, the mill was able to decommission the No. 1 HFB, which has substantially lowered operating and maintenance costs.

Journal articles
Magazine articles
Open Access
Evaluation of soap recovery efficiency from black liquor — analytical tools, TAPPI Journal April 2023

ABSTRACT: Soap skimmings (“soap”) are typically recovered from black liquor in kraft mills that process a high percentage of softwood. In many mills, the recovery of soap is inefficient, negatively impacting performance of evaporators and recovery boilers and resulting in loss of potential revenue. A thorough evaluation of soap recovery performance in a kraft mill requires measurement of soap content in black liquor at various sampling locations, especially around the soap skimmer.The standard laboratory method for evaluating soap content in black liquor is a complex, multi-step process that relies on solvent extraction and titration; most mills send these samples to an outside laboratory for this analysis. In this study, 100 black liquor samples, with a wide range of soap concentrations, were tested by the standard solvent extraction method. After additional dilution, each sample was also tested for surface tension with a bubble pressure tensiometer. The results were found to correlate very closely with the solvent extraction tests results. This alternate method, using surface tension measurements of diluted black liquor samples, produces rapid results and can be easily implemented in most kraft mills, which would facilitate much more frequent in-house evaluations of soap recovery performance.

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