Numerical investigation of the grinding process in a beater wheel mill with classifier

Anagnostopoulos, J; Bergeles, G

dc.contributor.author	Anagnostopoulos, J	en
dc.contributor.author	Bergeles, G	en
dc.date.accessioned	2014-03-01T01:13:13Z
dc.date.available	2014-03-01T01:13:13Z
dc.date.issued	1997	en
dc.identifier.issn	0742-4795	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12369
dc.subject.classification	Engineering, Mechanical	en
dc.subject.other	Classifiers	en
dc.subject.other	Computer simulation	en
dc.subject.other	Computer software	en
dc.subject.other	Equations of motion	en
dc.subject.other	Erosion	en
dc.subject.other	Evaporation	en
dc.subject.other	Mathematical models	en
dc.subject.other	Particle size analysis	en
dc.subject.other	Stochastic control systems	en
dc.subject.other	Beater wheel mill	en
dc.subject.other	Grinding mills	en
dc.title	Numerical investigation of the grinding process in a beater wheel mill with classifier	en
heal.type	journalArticle	en
heal.identifier.primary	10.1115/1.2817049	en
heal.identifier.secondary	http://dx.doi.org/10.1115/1.2817049	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	A numerical investigation is presented for a two-dimensional simulation of the gas flow field and of the dynamic behavior of lignite particles inside Beater Wheel mills with classifier, installed in large coal-fired plants. A large number of representative particles are tracked using Lagrangian equations of motion, in combination with a stochastic model for particle turbulent dispersion. All the important mechanisms associated with the particle motion through the mill (particle-surface collisions and rebounding phenomena, fuel moisture evaporation and erosion wear of internal surfaces) are modeled. A special model is constructed to simulate the fragmentation of impacting particles and to calculate the size distribution of the final mill product. The models are regulated on the basis of available data from grinding mills of the Greek lignite power stations. The numerical code is capable of predicting the locations of significant erosion and to estimate the amount of particle mass that circulates through the mill via the classifying chamber. Mean impact velocity and impingement angle distributions along all the internal surfaces are also provided. The results indicate remarkable differences in the extent of the erosion caused at different locations of the mill. Also, the significant role of the leading blades arrangement inside the classifier on its classification performance and efficiency is elucidated.	en
heal.publisher	ASME-AMER SOC MECHANICAL ENG	en
heal.journalName	Journal of Engineering for Gas Turbines and Power	en
dc.identifier.doi	10.1115/1.2817049	en
dc.identifier.isi	ISI:A1997XQ14200032	en
dc.identifier.volume	119	en
dc.identifier.issue	3	en
dc.identifier.spage	723	en
dc.identifier.epage	733	en