Search

Effects of the Partial Replacement of SB latex with Dextrin Starch on the Thickness Distribution of Coating Layers, 2008 Advanced Coating Fundamentals Symposium

Effects of the Partial Replacement of SB latex with Dextrin Starch on the Thickness Distribution of Coating Layers, 2008 Advanced Coating Fundamentals Symposium

Novel Particle Size Characterization of Coating Pigments: Comparing Acoustic Spectroscopy with Laser Light Scattering and Sedimentation Techniques, 2008 Advanced Coating Fundamentals Symposium

Novel Particle Size Characterization of Coating Pigments: Comparing Acoustic Spectroscopy with Laser Light Scattering and Sedimentation Techniques, 2008 Advanced Coating Fundamentals Symposium

TEMPERATURE PROFILE MEASUREMENT APPLICATIONS OF MOVING WEBS AND ROLL STRUCTURES WITH INTELLIGENT ROLL EMBEDDED SENSOR TECHNOLOGY, TAPPICon22

Sponsorship Advertising

Sponsorship Advertising TAPPI Partner Sponsorship Opportunities Reach industry decision-makers across the globe:  In print, in person and online.   TAPPI’s electronic and print publications provide

Press conditions define heatset piling tendency, 2010 TAPPI Advanced Coating Fundamentals Symposium

Press conditions define heatset piling tendency, 2010 TAPPI Advanced Coating Fundamentals Symposium

Flow determination by chemical method, Technical Information Paper TIP 0410-09 (2023)

Flow determination by chemical method, Technical Information Paper TIP 0410-09 (2023)

Compressive Treatment Technology, 1993 Nonwovens Conference Proceedings

Compressive Treatment Technology, 1993 Nonwovens Conference Proceedings

7.3_Ryan.M.pdf

Advantages of lean duplex stainless steels in the pulp and paper industry, TAPPI Journal April 2023

ABSTRACT: The performance of lean duplex stainless steels has been utilized by the pulp and paper industry since their introduction to the market almost 20 years ago. Experience has shown that this group of stainless steels has exceptional performance in, for example, alkaline environments towards typical deterioration mechanisms, i.e., uniform corrosion and stress corrosion cracking. The chemistry of the “lean” duplex steels is designed so that the content of volatile and expensive elements like nickel and molybdenum can be reduced to an absolute minimum without sacrificing the technical performance. This reduces the raw material cost and most importantly provides predictability of the steel price, which is often challenging with conventional austenitic and duplex stainless steels.Thanks to a dual phase microstructure and high nitrogen content, lean duplex steels have at least two times higher strength compared to standard austenitic stainless steels. This is often a preferred feature in pulp and paper construction, as it enables lighter structures and less material to be utilized. Today, lean duplex steels are widely available in various dimensions, from thin cold rolled sheets up to thick hot rolled plates. Lean duplex steels are also fully recyclable after the decommissioning stage of the equipment, thereby contributing to the circular economy.

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.