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Journal articles
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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.

Journal articles
Open Access
The effect of tmp refining using an adjustable-speed drive o

The effect of tmp refining using an adjustable-speed drive on energy consumption and pulp quality, TAPPI JOURNAL, September 1994, Vol. 77(9)

Journal articles
Open Access
Fundamental study of screening hydraulics part 2: Fiber orie

Fundamental study of screening hydraulics part 2: Fiber orientation in the feed side of a screen basket, TAPPI JOURNAL, September 1994, Vol. 77(9)

Journal articles
Open Access
Paper machine evaluation by fiber orientation profile analys

Paper machine evaluation by fiber orientation profile analysis, TAPPI JOURNAL, September 1994, Vol. 77(9)

Journal articles
Open Access
Starch-based hot melts for adhesive applications, TAPPI JOURNAL, September 1994, Vol. 77(9)

Starch-based hot melts for adhesive applications, TAPPI JOURNAL, September 1994, Vol. 77(9)

Journal articles
Open Access
Recycling symposium balances research and reality, TAPPI JOU

Recycling symposium balances research and reality, TAPPI JOURNAL, September 1994, Vol. 77(9)

Journal articles
Open Access
Accurate determination of six common fillers in fine papers, newsprint, and recycled stock by x-ray fluorescence spectrometry, TAPPI JOURNAL, April 1995, Vol. 78(4)

Accurate determination of six common fillers in fine papers, newsprint, and recycled stock by x-ray fluorescence spectrometry, TAPPI JOURNAL, April 1995, Vol. 78(4)

Journal articles
Open Access
X-ray diffraction for quantifying calcium carbonate fillers in printing and writing papers, TAPPI JOURNAL, April 1995, Vol. 78(4)

X-ray diffraction for quantifying calcium carbonate fillers in printing and writing papers, TAPPI JOURNAL, April 1995, Vol. 78(4)

Journal articles
Open Access
The effects of retention aids, drainage conditions, and pret

The effects of retention aids, drainage conditions, and pretreatment of slurry on high-vacuum dewatering: a laboratory study, TAPPI JOURNAL, April 1995, Vol. 78(4)

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