Index for iron-based slagging for pulverized coal firing in oxidizing and reducing conditions

Citation
Ar. Mclennan et al., Index for iron-based slagging for pulverized coal firing in oxidizing and reducing conditions, ENERG FUEL, 14(2), 2000, pp. 349-354
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environmental Engineering & Energy
Journal title
ENERGY & FUELS
ISSN journal
0887-0624 → ACNP
Volume
14
Issue
2
Year of publication
2000
Pages
349 - 354
Database
ISI
SICI code
0887-0624(200003/04)14:2<349:IFISFP>2.0.ZU;2-L
Abstract
A model for the prediction of iron-based slagging precursors from the combu stion of iron-containing coals is detailed. The model accounts for the form of iron (pyrite or siderite), the distribution of iron within the pulveriz ed coal, temperature, and oxidizing or reducing conditions. The input requi red for the model is a CCSEM analysis of the pulverized coal. For oxidizing conditions, the index predicts similar behavior for pyrite, and siderite-c ontaining coals, with iron alumine-silicate ash particles becoming sticky a t temperatures greater than 1400 degrees C. This suggests that for oxidizin g conditions, the extent of included iron minerals is the most important fa ctor. For reducing conditions, the index predicts sticky ash particles are formed at lower temperatures, as low as 1000 degrees C for pyrite-containin g coals as a result of the decomposition and partial oxidation of pyrite-fo rming sticky particles, and 1100 degrees C for siderite-containing coals. F or reducing conditions, the level of excluded pyrite mineral for pyrite-con taining coals and the level of included iron-containing minerals associated with clays for siderite- and pyrite-containing coals are the most importan t factors determining slagging.