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

被引:58
|
作者
Montagnaro, Fabio [3 ]
Salatino, Piero [1 ,2 ]
机构
[1] Univ Naples Federico II, Dipartimento Ingn Chim, I-80125 Naples, Italy
[2] CNR, Ist Ric Combust, I-80125 Naples, Italy
[3] Univ Naples Federico II, Dipartimento Chim, I-80126 Naples, Italy
关键词
Coal gasification; Slagging; Entrained flow; Char-slag interaction; Segregation; NUMERICAL-SIMULATION; CONVERSION SUBMODELS; DESIGN APPLICATIONS; ELEVATED PRESSURES; ASH DEPOSITION; TEMPERATURE; COMBUSTION; BEHAVIOR; SURFACE; LADEN;
D O I
10.1016/j.combustflame.2009.12.006
中图分类号
O414.1 [热力学];
学科分类号
摘要
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. (C) 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
引用
收藏
页码:874 / 883
页数:10
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