Numerical simulation of grinding and drying performance of a fluid-energy lignite mill

Anagnostopoulos, J; Bergeles, G; Epple, B; Stegelitz, P

dc.contributor.author	Anagnostopoulos, J	en
dc.contributor.author	Bergeles, G	en
dc.contributor.author	Epple, B	en
dc.contributor.author	Stegelitz, P	en
dc.date.accessioned	2014-03-01T01:16:49Z
dc.date.available	2014-03-01T01:16:49Z
dc.date.issued	2001	en
dc.identifier.issn	0098-2202	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14242
dc.subject	Numerical Simulation	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.other	3D simulations	en
dc.subject.other	Complex dynamics	en
dc.subject.other	Control volume methods	en
dc.subject.other	Domain geometry	en
dc.subject.other	Drying performance	en
dc.subject.other	Finite difference	en
dc.subject.other	Fluid-particle interaction	en
dc.subject.other	Fragmentation mechanism	en
dc.subject.other	Fuel mass	en
dc.subject.other	Gas phase equations	en
dc.subject.other	Lagrangian formulations	en
dc.subject.other	Local grid refinement	en
dc.subject.other	Mill performance	en
dc.subject.other	Moisture evaporation	en
dc.subject.other	Numerical algorithms	en
dc.subject.other	Numerical techniques	en
dc.subject.other	Operation characteristic	en
dc.subject.other	Particle collision	en
dc.subject.other	Particle dispersion model	en
dc.subject.other	Special treatments	en
dc.subject.other	Thermal behaviors	en
dc.subject.other	Computer simulation	en
dc.subject.other	Fossil fuels	en
dc.subject.other	Inlet flow	en
dc.subject.other	Lignite	en
dc.subject.other	Stochastic models	en
dc.subject.other	Three dimensional computer graphics	en
dc.subject.other	Two phase flow	en
dc.subject.other	Algorithms	en
dc.title	Numerical simulation of grinding and drying performance of a fluid-energy lignite mill	en
heal.type	journalArticle	en
heal.identifier.primary	10.1115/1.1350820	en
heal.identifier.secondary	http://dx.doi.org/10.1115/1.1350820	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	A numerical algorithm is developed for a detailed 3D simulation of the two-phase flow field in fluid-energy mills used for pulverization and drying of fossil fuels in large power plants. The gas phase equations are solved using finite differences and the control volume method, whereas a Lagrangian formulation with a stochastic particle dispersion model is adopted for the particulate phase. Fluid-particle interaction is taken into account to calculate the mass, momentum, and heat transfer between phases. Advanced numerical techniques for partially-blocked cells and local grid refinement have been utilized to achieve an accurate representation of the domain geometry and to enhance the accuracy of the results. Particle collisions, fragmentation mechanism, and moisture evaporation are simulated by corresponding models, whereas the special treatment employed for the rotating fan region provides the capability to solve the two-phase flow simultaneously in the entire rotating and nonrotating mill domain. The flow and the operation characteristics of a recently developed lignite mill are measured, and the numerical algorithm is used to predict the mill performance under various inlet profiles of the fuel mass flow rate. The predicted results are reasonable, and in agreement with the available measurements and observations, thus offering a deeper insight into the complex dynamic and thermal behavior of the two-phase flow in the mill. © 2001 ASME.	en
heal.publisher	ASME-AMER SOC MECHANICAL ENG	en
heal.journalName	Journal of Fluids Engineering, Transactions of the ASME	en
dc.identifier.doi	10.1115/1.1350820	en
dc.identifier.isi	ISI:000169370800014	en
dc.identifier.volume	123	en
dc.identifier.issue	2	en
dc.identifier.spage	303	en
dc.identifier.epage	310	en