Investigation of black liquor rheology and parameters affecting its viscosity
Malunga, Takunda (2023)
Diplomityö
2023
School of Energy Systems, Energiatekniikka
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2023080894332
https://urn.fi/URN:NBN:fi-fe2023080894332
Tiivistelmä
The paper and pulp industry generates a useful by-product from the pulping process called black liquor, which is often considered as a renewable fuel. The combustion of black liquor in the recovery boiler allows the recovery of chemicals from the pulping process and energy production. Understanding the rheological properties of black liquor is important in the optimization of its handling, transportation and combustion process in the recovery boiler.
The objectives of this master’s thesis were to study the rheological properties of black liquor and the influence of factors such as lignin removal, temperature, shear rate and dry solids content on black liquor viscosity.
The methodology of this study was based on an extensive literature review of research papers, scientific articles, conference papers and other scholarly material. A systematic search approach was utilised to identify relevant literature on black liquor from reputable databases and sources. The selected material was critically analysed to extract key information on black liquor.
Some key findings from this investigation show how black liquor viscosity decreased when temperature, shear rate or lignin removal increased. The study also show that an increase in dry solids content in the black liquor resulted in an increase in viscosity. Going forward, in order to enhance the research on the rheological properties of black liquor, future studies can focus on experimental work in the laboratory and/or on the other factors, which were not in the scope of this work such as the effect of pH on black liquor viscosity.
The objectives of this master’s thesis were to study the rheological properties of black liquor and the influence of factors such as lignin removal, temperature, shear rate and dry solids content on black liquor viscosity.
The methodology of this study was based on an extensive literature review of research papers, scientific articles, conference papers and other scholarly material. A systematic search approach was utilised to identify relevant literature on black liquor from reputable databases and sources. The selected material was critically analysed to extract key information on black liquor.
Some key findings from this investigation show how black liquor viscosity decreased when temperature, shear rate or lignin removal increased. The study also show that an increase in dry solids content in the black liquor resulted in an increase in viscosity. Going forward, in order to enhance the research on the rheological properties of black liquor, future studies can focus on experimental work in the laboratory and/or on the other factors, which were not in the scope of this work such as the effect of pH on black liquor viscosity.