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Journal articles
Open Access
Shop talk: Implementing an effective boilout program, TAPPI JOURNAL, September 1998, Vol. 81(9)

Shop talk: implementing an effective boilout program, TAPPI JOURNAL, September 1998, Vol. 81(9)

Journal articles
Open Access
Energy efficient motor and drive systems: Your path to profit, TAPPI JOURNAL, September 1998, Vol. 81(9)

Energy efficient motor and drive systems: your path to profit, TAPPI JOURNAL, September 1998, Vol. 81(9)

Journal articles
Open Access
Effluent quality at kraft mills that use complete substitution bleaching, TAPPI JOURNAL, April 1999, Vol. 82(4)

Effluent quality at kraft mills that use complete substitution bleaching, TAPPI JOURNAL, April 1999, Vol. 82(4)

Journal articles
Open Access
Trends in u.s. kraft mill trs emissions, TAPPI JOURNAL, April 1999, Vol. 82(4)

Trends in u.s. kraft mill trs emissions, TAPPI JOURNAL, April 1999, Vol. 82(4)

Journal articles
Open Access
A force balance model of pulp screen capacity, TAPPI JOURNAL, April 1999, Vol. 82(4)

A force balance model of pulp screen capacity, TAPPI JOURNAL, April 1999, Vol. 82(4)

Journal articles
Open Access
The Effects of cyclic axial loading of single wood pulp fibers at elevated temperature and humidity, TAPPI JOURNAL, April 1999, Vol. 82(4)

The Effects of cyclic axial loading of single wood pulp fibers at elevated temperature and humidity, TAPPI JOURNAL, April 1999, Vol. 82(4)

Magazine articles
Open Access
Mondi in south africa, TAPPI JOURNAL, April 1999, Vol. 82(4)

Mondi in south africa, TAPPI JOURNAL, April 1999, Vol. 82(4)

Journal articles
Magazine articles
Open Access
Ultrastructural Behavior of Cell Wall Polysaxxharides, TAPPI Journal April 2022

ABSTRACT: Considerable information on the ultrastructural organization of the plant cell wall and the supermolecular arragement of the cell wall components, in particular of cellulose, has been obtained with the electron microscope.

Journal articles
Magazine articles
Open Access
A feasibility study of using the organic Rankine cycle for power generation from the flue gases of recovery boilers, TAPPI Journal August 2022

ABSTRACT: Almost 415 tons/h of flue gases with a temperature of 160°C are released to the atmosphere from the recovery boiler of a pulp mill with capacity of 1000 air dried (a.d.) metric tons of pulp per day. This is a large waste heat stream that can be used to generate power, to decrease the operating costs of a pulp mill, and to save carbon dioxide (CO2) emissions. In this work, the feasibility of using an organic Rankine cycle (ORC) with ammonia as the working fluid to generate power from the flue gases of recovery boilers is studied. CHEMCAD and Taguchi methods are used for simulation of the process and for optimization of operating conditions, respectively. The temperature of the ammonia and flue gases at the exit of evaporator, exit pressure of the pump and turbine, and the degree of subcooling of ammonia at the exit of the condenser are five operating parameters that are manipulated to optimize the process. Three different scenarios are defined: minimizing the net power cost, maximizing the ORC efficiency, and maximizing the net profit. Different aspects of these scenarios, such as net power generation, cost, efficiency, and CO2 emission savings are discussed, and optimum operating conditions are reported.

Journal articles
Magazine articles
Open Access
Causes of poor dregs settling in a green liquor clarifier, TAPPI Journal August 2022

ABSTRACT: A study was conducted to examine the most likely parameters responsible for poor dregs settling at a kraft mill over a 2.5-year period, using multivariate data analysis (MVDA) and machine learning (ML) techniques. The dregs settling behavior seems to be seasonally influenced, implying that wood quality variation can be a factor. The results from the MVDA/ML analysis show that poor dregs settling is correlated to incomplete combustion and/or low load conditions in the recovery boiler, low sulfidity in the causticizing plant, and high flow in the green liquor•weak wash cycle. Compositions of dregs and black liquor were also examined to identify correlations with impaired dregs settling. The results show that poor dregs settling strongly correlates with high silicon (Si) content in dregs and moderately correlates with high iron (Fe) and high aluminum (Al) contents, and with low bulk density in dregs. For mills that experience dregs settling or green liquor filtering issues, regular compositional analyses of dregs, green liquor, weak wash, and black liquor are recommended in order to monitor the dynamics of silicon and other constituents in the recovery cycle.

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