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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
Open Access
Transfer of cationic retention aid from fibers to fine particles and cleavage of polymer chains under wet-end papermaking conditions, TAPPI JOURNAL, May 1993, Vol. 76(5)

Transfer of cationic retention aid from fibers to fine particles and cleavage of polymer chains under wet-end papermaking conditions, TAPPI JOURNAL, May 1993, Vol. 76(5)

Magazine articles
Open Access
Experiences of safety analyses in the pulp and paper industry, TAPPI JOURNAL, May 1993, Vol. 76(5)

Experiences of safety analyses in the pulp and paper industry, TAPPI JOURNAL, May 1993, Vol. 76(5)

Journal articles
Open Access
Forming fabrics for alkaline conversions, TAPPI JOURNAL, November 1993, Vol. 76(11)

Forming fabrics for alkaline conversions, TAPPI JOURNAL, November 1993, Vol. 76(11)

Journal articles
Open Access
Bleaching and brightness stability of aspen biomechanical pulps, TAPPI JOURNAL, November 1993, Vol. 76(11)

Bleaching and brightness stability of aspen biomechanical pulps, TAPPI JOURNAL, November 1993, Vol. 76(11)

Journal articles
Open Access
Steam drying and fluidized-bed calcination of lime and mud, TAPPI JOURNAL, November 1993, Vol. 76(11)

Steam drying and fluidized-bed calcination of lime and mud, TAPPI JOURNAL, November 1993, Vol. 76(11)

Journal articles
Open Access
A cycle for implementing superheated-steam drying of paper, TAPPI JOURNAL, November 1993, Vol. 76(11)

A cycle for implementing superheated-steam drying of paper, TAPPI JOURNAL, November 1993, Vol. 76(11)

Journal articles
Open Access
Dynamic behavior of steel core in the unwinding process, TAPPI JOURNAL, October 1993, Vol. 76(10)

Dynamic behavior of steel core in the unwinding process, TAPPI JOURNAL, October 1993, Vol. 76(10)

Magazine articles
Open Access
A visit to mount st. helens; meta lake illustrates natural recovery following volcanic eruption, TAPPI JOURNAL, April 1994, Vol. 77(4)

A visit to mount st. helens; meta lake illustrates natural recovery following volcanic eruption, TAPPI JOURNAL, April 1994, Vol. 77(4)

Magazine articles
Open Access
The epa's process safety management program for preventing accidental chemical releases (40 cfr 68), TAPPI JOURNAL, April 1994, Vol. 77(4)

The epa's process safety management program for preventing accidental chemical releases (40 cfr 68), TAPPI JOURNAL, April 1994, Vol. 77(4)

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