Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
The effect of pressure on coal char combustion
Autore:
Liakos, HH; Theologos, KN; Boudouvis, AG; Markatos, NC;
Indirizzi:
Natl Tech Univ Athens, Dept Chem Engn, Athens 15780, Greece Natl Tech UnivAthens Athens Greece 15780 hem Engn, Athens 15780, Greece
Titolo Testata:
APPLIED THERMAL ENGINEERING
fascicolo: 9, volume: 21, anno: 2001,
pagine: 917 - 928
SICI:
1359-4311(200106)21:9<917:TEOPOC>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTICLE-SIZE;
Keywords:
pressurized char combustion; chemical reaction kinetics; diffusion;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Boudouvis, AG Natl Tech Univ Athens, Dept Chem Engn, Zografou Campus, Athens 15780, Greece Natl Tech Univ Athens Zografou Campus Athens Greece 15780e
Citazione:
H.H. Liakos et al., "The effect of pressure on coal char combustion", APPL TH ENG, 21(9), 2001, pp. 917-928

Abstract

A two-dimensional, two-phase combustion model of pulverized coal char at elevated pressures is presented in this paper. This is often encountered in furnaces used for power generation, industrial heating and steam production, and for conversion of solids to gas and liquid products. In pressurized circulating fluidized bed boilers, the effect of pressure on char combustionis significant. Of particular importance is to reveal the relative significance of the diffusion and chemical reaction, as controlling mechanisms, and to evaluate the effect of total pressure on the performance of the combustion chamber. The partial differential equations of conservation of mass, momentum and energy are solved taking into consideration turbulent flow, interphase mass- and heat-transfer, radiation and varying operational conditions (e.g. feed of coal and primary and secondary air). The equations are integrated with the finite volume method and are solved for the flow field, temperature field in the gaseous and solid phases and the concentration of reactants and products. The results show that both chemical reaction and diffusion mechanisms control the combustion at elevated pressure. Moreover? theeffect of pressure on the reaction kinetics proves to be significant. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 16:08:16