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Integrated study of flue gas flow and superheating process in a recovery boiler using computational fluid dynamics and 1D-process modeling, TAPPI Journal June 2020
ABSTRACT: Superheaters are the last heat exchangers on the steam side in recovery boilers. They are typically made of expensive materials due to the high steam temperature and risks associated with ash-induced corrosion. Therefore, detailed knowledge about the steam properties and material temperature distribution is essential for improving the energy efficiency, cost efficiency, and safety of recovery boilers. In this work, for the first time, a comprehensive one-dimensional (1D) process model (1D-PM) for a superheated steam cycle is developed and linked with a full-scale three-dimensional (3D) computational fluid dynamics (CFD) model of the superheater region flue gas flow. The results indicate that: (1) the geometries of headers and superheater platens affect platen-wise steam mass flow rate distribution (3%•7%); and (2) the CFD solution of the 3D flue gas flow field and platen heat flux distribution coupled with the 1D-PM affect the platen-wise steam superheating temperature (45%•122%) and material temperature distribution (1%•6%). Moreover, it is also found that the commonly-used uniform heat flux distribution approach for the superheating process is not accurate, as it does not consider the effect of flue gas flow field in the superheater region. These new observations clearly demonstrate the value of the present integrated CFD/1D-PM modeling approach.
Journal articles
Magazine articles
The Knowledge Trail, Paper360º, July/August 2017
The Knowledge Trail, Paper360º, July/August 2017
Journal articles
Magazine articles
The Future of Sustainability at Pulp and Paper Mills, Paper360º November/December 2021
The Future of Sustainability at Pulp and Paper Mills, Paper360º November/December 2021
Journal articles
Magazine articles
Improving the efficiency of hydrogen peroxide bleaching of c
Improving the efficiency of hydrogen peroxide bleaching of chemimechanical pulp by continuous replenishment of bleaching chemicals, TAPPI JOURNAL June 2017
Journal articles
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World’s Largest MVR Evaporation Plant for Sulphite Spent Liquor at Sappi Saiccor Pulp Mill, Paper360º July/August 2022
Journal articles
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Machinery That Can Support Zero Landfill Goals, Paper360º January/February 2022
Machinery That Can Support Zero Landfill Goals, Paper360º January/February 2022
Journal articles
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TAPPI Journal Summaries, Paper360º September/October
TAPPI Journal Summaries, Paper360º September/October
Journal articles
Magazine articles
TAPPI Journal Summaries, Paper360º, January/February 2018
TAPPI Journal Summaries, Paper360º, January/February 2018
Journal articles
Magazine articles
New Outlook for Ecologic, Paper360º March/April 2017
New Outlook for Ecologic, Paper360º March/April 2017