CFD optimization of wet desulphurization process - PowerStation.pdf

Article about CFD simulation and optimization of injection of slurry into exhaust gas for desulphurization. Considerable reduction of pump power and improved efficiency of the desulphurization process was achieved based on our simulation.
The modelling consisted of a 3D turbulent two-phase transient coupled calculation, including evaporation, breakup, and collision of the slurry droplets. The initial droplet size distribution, at the exit of the slurry pipe, was based on empirical relations as function of nozzle diameter, pressure and liquid properties.

1. Gasværksvej26, DK 9000 Aalborg www.R-R-Consult.com www.LinkedIn.com/company/R&R-consult [email protected]
CFD optimization of wet desulphurization process -PowerStation

2. Gasværksvej26, DK 9000 Aalborg www.R-R-Consult.com www.LinkedIn.com/company/R&R-consult [email protected]
CFD optimization of wet desulphurization process -PowerStation
Nordjyllandsværket–Courtesy Aalborg Forsyning
Considerable reduction of pump power and improved efficiency of the
desulphurization process was achieved based on our simulation.
One of our projects was to investigate the exhaust gas flow distribution in
the desulphurization plant. We found that, due to the complicated duct
structure for the exhaustflow, the flow distribution was very unevenly
distributed, and that resulted ina reduced efficiency for the
desulphurization process.
Wemodelledthecompleteexhaustflowandtheinjection,trackingand
evaporationoftheslurryflow.Basedonourworkandrecommendations,
changesweremadetotheexhaustflowpathandtheslurryinjection.The
resultofthiswasverysuccessfulwithanimproveddesulphurization
processandareductionofthepowerconsumptionfortheslurrypumps
by30percent.
Path lines from upstream and through desulphurization section –Colourrepresents speed
R&RConsultplayedakeyroleinmakingNordjyllandPowerStationthe
world’smostefficientcoal-firedCHPplant.TheplantisEurope’sfourth-
largestgeneratorofelectricityandownedbytheCityofAalborg.R&R
ConsulthavebeeninvolvedinseveralprojectsforNordjyllandsværket
concerningtheoptimizationofdifferentpartsoftheprocess.

3. Gasværksvej26, DK 9000 Aalborg www.R-R-Consult.com www.LinkedIn.com/company/R&R-consult [email protected]
CFD optimization of wet desulphurization process -Powerstation
Theinletexhaustflowdistributionwaspredictedbyincludingthe
upstreamducting.Thisrevealedanunevendistribution,exacerbated
bythetransitionductintothedesulphurizationplant.Theskewedflow
profilewassuccessfullyamendedbytheinstallationofguidingplates,
thedesignandlocationofwhichweredeterminedbasedontheCFD-
analysis
Themodellingconsistedofa3Dturbulenttwo-phasetransientcoupled
calculation,includingevaporation,breakupandcollisionoftheslurry
droplets.Theinitialdropletsizedistribution,attheexitoftheslurrypipe,
wasbasedonempiricalrelationsasfunctionofnozzlediameter,pressure
andliquidproperties.
Outline of model for desulphurization calculation
Slurry droplets
Link to youtubeCFD animation