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New learnings and strategies for meeting future recovery boiler particulate emission limits with existing electrostatic precipitators, TAPPI Journal June 2021

ABSTRACT: It is foreseeable that recovery boiler particulate emission limits in the United States and Canada will continue to get more stringent with time. Because of this, continued improvement of emission control equipment, as well as a better understanding of how operating parameters affect performance, are necessary. Although electrostatic precipitators (ESPs) are often viewed as a mature technology, many improvements in ESP technology continue to be developed. In recent years, academic efforts have improved the understanding of recovery boiler operating conditions on ESP performance. Additionally, advancements in materials, power supplies, and design continue to improve the efficiency and reliability of ESPs.This paper discusses how recovery boiler and electrostatic precipitator (ESP) operating factors affect ESP perfor-mance based on process simulations and practical experience, and how these learnings can be implemented to improve future operation of existing ESPs.

Journal articles
Magazine articles
Open Access
Probing the molecular weights of sweetgum and pine kraft lignin fractions, TAPPI Journal June 2021

ABSTRACT: The present investigation undertook a systematic investigation of the molecular weight (MW) of kraft lignins throughout the pulping process to establish a correlation between MW and lignin recovery at different extents of the kraft pulping process. The evaluation of MW is crucial for lignin characterization and utilization, since it is known to influence the kinetics of lignin reactivity and its resultant physico-chemical properties. Sweetgum and pine lignins precipitated from black liquor at different pHs (9.5 and 2.5) and different extents of kraft pulping (30–150 min) were the subject of this effort. Gel permeation chromatography (GPC) was used to determine the number average molecular weight (Mn), mass average molecular weight (Mw), and polydispersity of the lignin samples. It was shown that the MW of lignins from both feedstocks follow gel degradation theory; that is, at the onset of the kraft pulping process low molecular weight-lignins were obtained, and as pulping progressed, the molecular weight peaked and subsequently decreased. An important finding was that acetobromination was shown to be a more effective derivatization technique for carbohydrates containing lignins than acetylation, the technique typically used for derivatization of lignin.

Journal articles
Open Access
Functional surfaces produced by foam coating, TAPPI JOURNAL

Functional surfaces produced by foam coating, TAPPI JOURNAL August 2016

Journal articles
Subscription Access
Estimating Short Circuit Data on a Personal Computer Spreads

Estimating Short Circuit Data on a Personal Computer Spreadsheet Program, 1990 Engineering Conference Proceedings

Journal articles
Open Access
Use of Simulation Models in the On-Line Control and Optimiza

Use of Simulation Models in the On-Line Control and Optimization of the Refining Process, 1991 Engineering Conference Proceedings

Journal articles
Open Access
Case Histories of Three Yankee Cracking Incidents Associated

Case Histories of Three Yankee Cracking Incidents Associated with Shell Edge Extensions, 1991 Engineering Conference Proceedings

Journal articles
Subscription Access
Application of Triggered Fault Current Limiters in the Pulp

Application of Triggered Fault Current Limiters in the Pulp and Paper Industry, 1991 Engineering Conference Proceedings

Journal articles
Open Access
Theoretical Drying Study of Single-Tier Versus Conventional

Theoretical Drying Study of Single-Tier Versus Conventional Two-Tiered Dryer Configurations, 1992 Engineering Conference Proceedings

Journal articles
Open Access
Simulation of Dynamics and Control of a Two-Ply Paper Machin

Simulation of Dynamics and Control of a Two-Ply Paper Machine, 1993 Engineering Conference Proceedings

Journal articles
Open Access
Wear Testing of Iron- and Cobalt-Based Alloys in Simulated P

Wear Testing of Iron- and Cobalt-Based Alloys in Simulated Pulp and Paper Mill Environments, 1993 Engineering Conference Proceedings

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