Emissions control at pulp mills: A case study on the implementation of combined SOx and NOx removal technology
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Sustainable energy systems (MPSES), MSc
Publicerad
2024
Författare
Myrberg, Samuel
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
In this study the implementation of a combined NOx and SOx scrubber at pulp
mills are evaluated using Södra´s site in Mönsterås as a case study. The study
aimed to evaluate how the current process would be impacted by implementing the
scrubber when achieving the same emission reduction as the current best available
technology for large combustion plants in regard to chemical consumption, needed
process modifications and possibility to treat the scrubber effluent with the current
wastewater treatment system. To achieve this a scrubber was designed and modelled
using Aspen Plus investigating different sulfite oxidation rates and flue gas data
was collected from the site. From the results it was concluded that the impact on
consumption of chemicals was of low significance except for NaOH and oxidised white
liquor and that the effluent should not be treated in the current wastewater treatment
plant due to large amounts of sulfate in the effluent which if not removed can affect
the wastewater treatment negatively. In regard to process modifications this depends
on which oxidising agent is used, for H2O2 the right temperature conditions can
already be achieved but for ClO2 the temperature needs to be further decreased
which could be achieved through flue gas condensation.
Beskrivning
Ämne/nyckelord
SOx , NOx , pulp mills , recovery boiler , lime kiln , sulfite oxidation , wastewater treatment