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Journal articles
Magazine articles
TAPPI Journal Summaries, Paper360º July/August 2020

TAPPI Journal Summaries, Paper360º July/August 2020

Journal articles
Magazine articles
Open Access
Case study: Paper mill power plant optimization—balancing steam venting with mill demand, TAPPI Journal June 2020

ABSTRACT: Most Power departments are tasked with generating steam to support mill wide operations, generate electricity, and reduce operating costs. To accomplish these tasks, power boilers generate high pressure steam that is reduced to intermediate and low pressures for process utilization in the mill by means of steam turbine generator extraction or pressure reducing valves. The most economical method to reduce steam pressure is the use of steam turbine generators, as electricity is generated from the steam when it is reduced in pressure. Electricity that is produced by these generators provides a substantial financial benefit and helps offset overall operational costs. To achieve tangible financial gains, the mill must evaluate the overall cost of steam production and the price of electricity.The current work provides a case study of power plant optimization that evaluated electricity production and steam production costs balanced with mill steam demand. Process and cost optimization led to a significant reduc-tion in low pressure steam venting, resulting in reduced fuel consumption and reduced operating cost.

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
Steam turbine risk assessment project: inspection and overhaul optimization of steam turbines, TAPPI JOURNAL, September 1998, Vol. 81(9)

Steam turbine risk assessment project: inspection and overhaul optimization of steam turbines, TAPPI JOURNAL, September 1998, Vol. 81(9)

Journal articles
Open Access
Environmental progress at Howe Sound Pulp & Paper, TAPPI JOURNAL, September 1998, Vol. 81(9)

Environmental progress at howe sound pulp & paper, TAPPI JOURNAL, September 1998, Vol. 81(9)

Journal articles
Open Access
Design and installation of a rplacement thermal oxidizer for odor abatement, TAPPI JOURNAL, April 1999, Vol. 82(4)

Design and installation of a rplacement thermal oxidizer for odor abatement, TAPPI JOURNAL, April 1999, Vol. 82(4)

Journal articles
Open Access
Some mechanistic insights for using the streaming current detector to measure wet-end charge, TAPPI JOURNAL, August 1999, Vol. 82(8)

Some mechanistic insights for using the streaming current detector to measure wet-end charge, TAPPI JOURNAL, August 1999, Vol. 82(8)

Journal articles
Open Access
Engineering quality theme for 1999 tappi engineering/process & product quality conference, TAPPI JOURNAL, December 1999, Vol. 82(12)

Engineering quality theme for 1999 tappi engineering/process & product quality conference, TAPPI JOURNAL, December 1999, Vol. 82(12)

Journal articles
Open Access
Treatment of edta-containing pulp and paper mill wastewaters in activated sludge plants, TAPPI JOURNAL, February 1999, Vol. 82(2)

Treatment of edta-containing pulp and paper mill wastewaters in activated sludge plants, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
Australia's Paper and Forestry Forum: A Preview of Significant Issues for 1998-2008, TAPPI JOURNAL, January 1999, Vol. 83(5)

Australia's Paper and Forestry Forum: A Preview of Significant Issues for 1998-2008, TAPPI JOURNAL, January 1999, Vol. 83(5)

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