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Composition and microstructure of a furnace ash deposit from a coal-fired utility boiler

Journal Article:

Abstract

An exploratory study of the structure and composition of furnace-ash deposits was carried out using optical metallography, electron microprobe analysis, scanning electron microscopy, and energy-dispersive X-ray analysis. The results of these analyses were supplemented by studies of particulate melting temperature using hot-stage microscopy to measure melting temperature, and energy-dispersive X-ray analyses to measure composition of melted particles. It was found that the general structure of the ash deposit was a matrix of glassy, spherical particles having a wide range of composition in which unfused particles containing iron oxide and calcium oxide were dispersed. At the imprint of the tube surface a considerable concentration of calcium, sulphur and iron was found. Near the fused outer surface of the deposit, the glassy materials had melted into a porous, glassy slag containing spherical globules of iron oxide combined with other materials. There were no systematic compositional gradients from the tube surface to the fused outer layer except for the sulfur layer found only at the tube surface. However, there were significant differences in composition from particle to particle and these differences were similar to those found in the coal mineral matter as isolated by low-temperature ashing. Single particles of low-temperature ash were found  More>>
Authors:
Publication Date:
Jul 01, 1980
Product Type:
Journal Article
Reference Number:
EDB-81-053750
Resource Relation:
Journal Name: J. Eng. Power; (United States); Journal Volume: 102:3
Subject:
01 COAL, LIGNITE, AND PEAT; ASHES; CHEMICAL COMPOSITION; MELTING POINTS; BOILER FUELS; BOILERS; CALCIUM; CALCIUM OXIDES; COAL; DEPOSITION; ELECTRON MICROPROBE ANALYSIS; FURNACES; IRON; IRON OXIDES; METALLOGRAPHY; MICROSTRUCTURE; PARTICLES; QUANTITATIVE CHEMICAL ANALYSIS; QUANTITY RATIO; SCANNING ELECTRON MICROSCOPY; SLAGS; STRUCTURAL CHEMICAL ANALYSIS; SULFUR; X RADIATION; ALKALINE EARTH METAL COMPOUNDS; ALKALINE EARTH METALS; CALCIUM COMPOUNDS; CARBONACEOUS MATERIALS; CHALCOGENIDES; CHEMICAL ANALYSIS; CRYSTAL STRUCTURE; ELECTROMAGNETIC RADIATION; ELECTRON MICROSCOPY; ELEMENTS; ENERGY SOURCES; FOSSIL FUELS; FUELS; IONIZING RADIATIONS; IRON COMPOUNDS; MATERIALS; METALS; MICROANALYSIS; MICROSCOPY; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RADIATIONS; RESIDUES; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; TRANSITION TEMPERATURE; 010600* - Coal, Lignite, & Peat- Properties & Composition
OSTI ID:
6560419
Country of Origin:
United States
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: JEPOA
Submitting Site:
CLA
Size:
Pages: 692-697
Announcement Date:

Journal Article:

Citation Formats

Fessler, R R. Composition and microstructure of a furnace ash deposit from a coal-fired utility boiler. United States: N. p., 1980. Web.
Fessler, R R. Composition and microstructure of a furnace ash deposit from a coal-fired utility boiler. United States.
Fessler, R R. 1980. "Composition and microstructure of a furnace ash deposit from a coal-fired utility boiler." United States.
@misc{etde_6560419,
title = {Composition and microstructure of a furnace ash deposit from a coal-fired utility boiler}
author = {Fessler, R R}
abstractNote = {An exploratory study of the structure and composition of furnace-ash deposits was carried out using optical metallography, electron microprobe analysis, scanning electron microscopy, and energy-dispersive X-ray analysis. The results of these analyses were supplemented by studies of particulate melting temperature using hot-stage microscopy to measure melting temperature, and energy-dispersive X-ray analyses to measure composition of melted particles. It was found that the general structure of the ash deposit was a matrix of glassy, spherical particles having a wide range of composition in which unfused particles containing iron oxide and calcium oxide were dispersed. At the imprint of the tube surface a considerable concentration of calcium, sulphur and iron was found. Near the fused outer surface of the deposit, the glassy materials had melted into a porous, glassy slag containing spherical globules of iron oxide combined with other materials. There were no systematic compositional gradients from the tube surface to the fused outer layer except for the sulfur layer found only at the tube surface. However, there were significant differences in composition from particle to particle and these differences were similar to those found in the coal mineral matter as isolated by low-temperature ashing. Single particles of low-temperature ash were found having low fusion temperatures, in the range of fusion temperatures for particles in furnance has. Thus, the glassy spheres found in furnace deposits could originate from single coal particles, without the need of interactions among coal particles or ash particles.}
journal = {J. Eng. Power; (United States)}
volume = {102:3}
journal type = {AC}
place = {United States}
year = {1980}
month = {Jul}
}