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Title: Analysis of char-slag interaction and near-wall particle segregation in entrained-flow gasification of coal

The fate of carbon particles during entrained-flow gasification of coal in the slagging regime is analyzed. More specifically, the study addresses the relevance of segregation of carbon particles in a near-wall region of the gasifier to coal conversion. Segregation of carbon particles is analyzed considering the effects of turbulence- and swirl-promoted particle migration toward the wall, interaction of the impinging particles with the wall ash layer, coverage of the slag layer by refractory carbon particles, accumulation of carbon particles in a dense-dispersed phase near the wall of the gasifier. Operating conditions of the gasifier and slag properties may be combined so as to give rise to a variety of conversion regimes characterized by distinctively different patterns of carbon particles segregation. A simple 1D model of an entrained-flow gasifier has been developed based on the conceptual framework of carbon particle segregation. The model aims at providing a general assessment of the impact of the different patterns of carbon particle segregation on the course and extent of carbon gasification. A sensitivity analysis with reference to selected model parameters is performed to identify key processes controlling carbon segregation and their impact on the gasifier performance. (author)
Authors:
 [1] ;  [2]
  1. Dipartimento di Chimica, Universita degli Studi di Napoli Federico II, Complesso Universitario del Monte di Sant'Angelo, 80126 Napoli (Italy)
  2. Dipartimento di Ingegneria Chimica, Universita degli Studi di Napoli Federico II and Istituto di Ricerche sulla Combustione, CNR, Piazzale Vincenzo Tecchio 80, 80125 Napoli (Italy)
Publication Date:
OSTI Identifier:
21305706
Resource Type:
Journal Article
Resource Relation:
Journal Name: Combustion and Flame; Journal Volume: 157; Journal Issue: 5; Other Information: Elsevier Ltd. All rights reserved
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CARBON; COAL GASIFICATION; COAL; PARTICLES; SEGREGATION; CHARS; WALLS; SLAGS; ASHES; CONVERSION; LAYERS; SENSITIVITY ANALYSIS; BUILDUP; MOTION; PERFORMANCE; REFRACTORIES; TURBULENCE; ENTRAINMENT; ONE-DIMENSIONAL CALCULATIONS; MATHEMATICAL MODELS Slagging; Entrained flow; Char-slag interactions