FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W118941002> ?p ?o ?g. }

• W118941002 abstract "The circulating fluidized bed (CFB) boiler is suitable for combustion of fuels with strong heterogeneity and/or with high sulphur content, such as biomass, municipal solid waste and coal with high content of sulphur. Further development of new boilers is ongoing and demands investigation of the complex phenomena governing CFB boilers. A method for modelling CFB boilers are macroscopic models, which are, to a varying extent, based on experimental data. A comprehensive macroscopic model considers fluid dynamics, combustion and heat transfer, but in this thesis only fluid dynamics is considered. In focus is modelling of vertical solids distribution in the riser, critical for heat transfer, corrosion and sulphur retention.Experimental data of solids concentration, through measurements of pressure differ-ences, has been obtained from a down-scaled cold model of a 125 MWe CFB boiler. The model was built in collaboration between BHEL and IIT Madras. Due to severe leakages in the model it was not possible to conduct any experiments with copper as bed material, which was necessary to simulate the boiler. However, experiments with silica sand were performed, but its larger particle size introduced problems since its particle terminal velocity is considerable higher than copper, which the capacity of the fan was dimensioned for. This implied very low recirculation.From experimental data a relation between superficial gas velocity and vertical solids concentration profile in splash zone can be observed. It is also evident that two solids decay constants is necessary to describe the profile. However, models available in literature give a poor prediction of the solids concentration in the investigated unit. Measured data from the bottom bed scatter much and the solids concentration in the transport zone is low, which make it difficult to draw any conclusions regarding these zones.Fluid dynamic models for different zones in a CFB are combined into one model for the entire CFB loop. The model describing the riser is validated against Turow 235 MWe and Zibo 135 MWe. The data from Zibo was fitting available model with two decay constants well. The 125 MWe BHEL boiler is modeled, but due to lack of data for validation purposes and more detailed bed material properties, it is difficult to conduct a proper modelling.In general it is concluded that a model with two decay constants is necessary to describe vertical solids distribution in a CFB unit and that further studies of the top solids concentration (or the fraction of cluster phase at the bottom bed surface) is needed to increase the usefulness of the model. Another conclusion drawn is that differences between different model predictions and experimental data are large and that more studies of vertical solids concentration, including units with non constant cross-sectional area is needed.Keywords: CFB, Modelling, Cold model, Vertical solids distribution" @default.
• W118941002 created "2016-06-24" @default.
• W118941002 creator A5020931059 @default.
• W118941002 creator A5069358758 @default.
• W118941002 date "2011-01-01" @default.
• W118941002 modified "2023-09-27" @default.
• W118941002 title "Modelling of vertical solids distribution in a circulating fluidized bed boiler" @default.
• W118941002 hasPublicationYear "2011" @default.
• W118941002 type Work @default.
• W118941002 sameAs 118941002 @default.
• W118941002 citedByCount "0" @default.
• W118941002 crossrefType "dissertation" @default.
• W118941002 hasAuthorship W118941002A5020931059 @default.
• W118941002 hasAuthorship W118941002A5069358758 @default.
• W118941002 hasConcept C105923489 @default.
• W118941002 hasConcept C116915560 @default.
• W118941002 hasConcept C121332964 @default.
• W118941002 hasConcept C127413603 @default.
• W118941002 hasConcept C178790620 @default.
• W118941002 hasConcept C185592680 @default.
• W118941002 hasConcept C192562407 @default.
• W118941002 hasConcept C196832758 @default.
• W118941002 hasConcept C2780013297 @default.
• W118941002 hasConcept C39432304 @default.
• W118941002 hasConcept C50517652 @default.
• W118941002 hasConcept C518851703 @default.
• W118941002 hasConcept C548081761 @default.
• W118941002 hasConcept C57879066 @default.
• W118941002 hasConcept C59269787 @default.
• W118941002 hasConcept C78762247 @default.
• W118941002 hasConceptScore W118941002C105923489 @default.
• W118941002 hasConceptScore W118941002C116915560 @default.
• W118941002 hasConceptScore W118941002C121332964 @default.
• W118941002 hasConceptScore W118941002C127413603 @default.
• W118941002 hasConceptScore W118941002C178790620 @default.
• W118941002 hasConceptScore W118941002C185592680 @default.
• W118941002 hasConceptScore W118941002C192562407 @default.
• W118941002 hasConceptScore W118941002C196832758 @default.
• W118941002 hasConceptScore W118941002C2780013297 @default.
• W118941002 hasConceptScore W118941002C39432304 @default.
• W118941002 hasConceptScore W118941002C50517652 @default.
• W118941002 hasConceptScore W118941002C518851703 @default.
• W118941002 hasConceptScore W118941002C548081761 @default.
• W118941002 hasConceptScore W118941002C57879066 @default.
• W118941002 hasConceptScore W118941002C59269787 @default.
• W118941002 hasConceptScore W118941002C78762247 @default.
• W118941002 hasLocation W1189410021 @default.
• W118941002 hasOpenAccess W118941002 @default.
• W118941002 hasPrimaryLocation W1189410021 @default.
• W118941002 hasRelatedWork W1145439386 @default.
• W118941002 hasRelatedWork W192561512 @default.
• W118941002 hasRelatedWork W193726383 @default.
• W118941002 hasRelatedWork W1966395380 @default.
• W118941002 hasRelatedWork W1969283255 @default.
• W118941002 hasRelatedWork W1974903714 @default.
• W118941002 hasRelatedWork W2016950555 @default.
• W118941002 hasRelatedWork W2040866148 @default.
• W118941002 hasRelatedWork W2041479253 @default.
• W118941002 hasRelatedWork W2048336439 @default.
• W118941002 hasRelatedWork W2116072406 @default.
• W118941002 hasRelatedWork W2144577276 @default.
• W118941002 hasRelatedWork W2146622771 @default.
• W118941002 hasRelatedWork W2163095692 @default.
• W118941002 hasRelatedWork W2365245174 @default.
• W118941002 hasRelatedWork W2377505112 @default.
• W118941002 hasRelatedWork W2529177588 @default.
• W118941002 hasRelatedWork W2980522911 @default.
• W118941002 hasRelatedWork W3125302694 @default.
• W118941002 hasRelatedWork W84251793 @default.
• W118941002 isParatext "false" @default.
• W118941002 isRetracted "false" @default.
• W118941002 magId "118941002" @default.
• W118941002 workType "dissertation" @default.