Energy, Recovery, Lime Kiln and Recaust

November 2 - 4, 2020 | Virtual

Energy, Recovery, Lime Kiln and Recaust (ERLR)

The chemical recovery cycle makes kraft pulping economically feasible. Key unit operations including the recovery boiler, recaust plant, lime kiln and power generation have significant impacts on maintaining high mill production rates. The purpose of this year’s sessions and panels is to provide experiences from industrial and academic experts on equipment maintenance, process chemistry and new technologies.

This track will provide participants with both fundamental and practical knowledge on key process areas in a mill, including evaporators, recovery boiler, recaust plant, lime kiln and energy generation. Topics are focused on maximizing the efficiency and throughput of the recovery cycle. Participants can also attend panels for in depth discussions with industry experts.

Recommended for operators, process engineers, control engineers, superintendents, managers and graduate students.

View the ERLR Track Schedule


Featured Presentations

Energy Storage


Mike Voll and John Howell
Stantec Consulting

Has the Time Come for Industrial Scale Energy Storage Systems in the PPT&P Industry?

Session 23  •  Wednesday, November 4  •  11:00am - 12:30pm

Over the past decade the cost of energy storage has dropped significantly. As a result, utility scale battery storage systems in the range of 200-400 MW have become relatively common. These large systems can easily meet the needs of most paper and pulp mills and offer substantial benefits.

Energy intensive plants can offset demand charges by storing energy in large volumes when it is less expensive to purchase and using it when the plant would otherwise incur demand charges. Energy storage to the electrical system would also facilitate the incorporation of renewables to the energy mix which can be used to offset carbon emissions or create carbon credits. It can also improve or manipulate a mill site’s power factor.

This presentation addresses strategies on how energy storage ca help improve mills' energy usage. Attendees will learn about various types of storage systems and how to assess whether a system would benefit their particular site.


James Cantrell, Jacobs Engineering

Black Liquor Evaporators Upgrade - Life Cycle Cost Analysis

Session 11  •  Tuesday, November 3  •  1:30pm - 2:30pm

Black liquor evaporation is generally the most energy intensive unit operation in a pulp and paper manufacturing facility.  The black liquor evaporators can represent a third or more of the total mill steam usage followed by the paper machine and digester. 

The median age of all North American evaporator systems is 44 years.  Roughly 25% of the current North American operating systems are 54 years or older.  Older systems require more periodic maintenance and have a higher risk of unplanned downtime.  Also, older systems have chronic issues with persistent liquor and vapor leaks, shell wall thinning, corrosion, and plugged tubes. Often these issues worsen to the point of requiring rebuild or replacement. 

This presentation will review the current state of black liquor evaporator systems in North America and present a basic method for determining whether a major rebuild or new installation is warranted using total life cycle cost analysis (LCCA).


Elizabeth Maggs,
University of Toronto

Settling and Filtering Properties of Green Liquor Dregs

Session 12  •  Tuesday, November 3  •  1:30pm - 2:30pm

Poor dregs settling and filterability have been a persistent problem in many kraft pulp mills, resulting in poor lime quality, poor pulping liquor quality, and ultimately poor pulp quality.

In severe cases, poor dregs settling and filterability can lead to equipment shutdown for cleaning resulting in substantial production losses.

This presentation will examine how black liquor burning temperature and the resulting char characteristics may affect dregs settling and filtering behaviors.

Energy, Recovery, Lime Kiln and Recaust Track Schedule

(Program is subject to change.)


Tuesday, November 3
1:30pm - 2:30pm
Session 11: Black Liquor Processing: Evaporators to Boilers

Session Chair: Eric Jin, Babcock and Wilcox


Black Liquor Evaporators Upgrade - Life Cycle Cost Analysis

James Cantrell, Jacobs Engineering

The Impact of Utilizing the Leading Edge Sootblower Nozzle on Recovery Boiler Superheater Platens

Danny Tandra, Clyde Industries, Inc.; Markku Pääkkönen, Pasi Miikkulainen, Andritz Inc.; Shenglong You, Markus Bussmann, University of Toronto
1:30pm - 2:30pm
Session 12: Improving Processability of Green Liquor

       Session Chair: Thanh Trung, FITNIR Analyzers Inc.


Settling and Filtering Properties of Green Liquor Dregs

Elizabeth Maggs, Xiaosong Mao, Torsten Meyer, Honghi Tran, University of Toronto; Andrew Jones, International Paper

CleanFlow Microfiltration Technology for Green and White Liquor

Rohan Bandekar, Jon Foan , Jim Wearing, NORAM Engineering; Anna Oldmark, Lennart Kallen, Cleanflow AB; Mikael Lindstrom, KTH Royal Institute of Technology; Jakob Liedberg, NORAM International AB
3:15pm - 4:45pm
Session 16: Managing Dissolving Tank Operation and Safety

Session Chair: Danny Tandra, Clyde Industries, Inc.


Development of Converging-Diverging Multi-Jet Nozzles for Molten Smelt Shattering

Eric Jin, Tony Habib, Simon Youssef, and Steve Osborne, Babcock and Wilcox; Honghi Tran, University of Toronto

Can Jellyroll Smelt be Effectively Shattered?

Markus Bussmann, University of Toronto

Scale Formation in Recovery Boiler Smelt Dissolving Tanks

 Honghi TranUniversity of Toronto; Heather Munn, Irving Pulp & Paper; Andrew (Andy) Jones, International Paper; Peter Hart, Westrock
3:15pm - 4:45pm
Session 17: Key Maintenance Issues for Rotary Kilns Panel Discussion
    Session Chair: Peter Gorog, Houghton Cascade Holdings, LLCGlenn HansonMetso Outotec
      Panelists: Palle Hansen - Valmet
Justin Bready - Kiln Technology
Josh Brant - Andritz
Wednesday, November 4
11:00am - 12:30pm
Session 23: Strategies to Improve Energy Usage in Mills

       Session Chair: Pasi Miikkulainen, Andritz Inc.


Boiler Retrofit Improves Efficiency and Increases Biomass Firing Rate

Samit Pethe, Paul W. Cloninger, Jansen Combustion and Boiler Technologies Inc. and Ryan R. Shortreed, Ken M. Hardison, Domtar Paper Company LLC

Total Pulp and Paper Mill Energy Evaluations

Richard Reese, CleanTech Partners

Has the Time Come for Industrial Scale Energy Storage Systems in the PPT&P Industry?

Mike Voll, John Howell, Stantec Consulting

11:00am - 12:30pm

Session 25: Lime Kiln Design to Increase Productivity

     Session Chair: Ray Leary, Houghton Cascade Holidings, LLC


Successful conversion to gas firing – how to avoid the downsides and get increased productivity and less emissions

Pedro Ladeira, FCT Combustion Inc.

Impact of Burner Design on Combustion Efficiency and Lime Kiln Performance

Eduardo Tater, Fives Pillard

Kiln Lining Installations a “Contractor’s Perspective”

 Tim Baker, JT Thorpe and Sons Engineering and Refractory Services

12:30am - 1:30pm

Session 26: Effects of Process Conditions on Lime Kiln Operation

     Session Chair: Wei Ren, FPInnovations


Effects of Rings on Flow and Temperature in Lime Kilns

Patrick Gareau, Markus Bussmann, Nikolai DeMartini, Honghi Tran, University of Toronto

How Process & Mechanical Conditions Affect Lime Recovery Kiln Thrust Positions - A Review of Operations and Mechanics for this Phenomenon

Andrew Wisner, Metso