skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Ash chemistry in the U-GAS process: industrial medium-Btu fuel gas demonstration-plant program

Abstract

The chemistry of the agglomeration of ash in IGT's U-GAS pilot plant runs on coke, run-of-mine Kentucky coal, and washed Kentucky coal has been investigated. Methods included optical and electron microscopy, chemical analyses, and fusibility tests. There is little difference in elemental composition of the ash among the three feeds. Agglomeration of ash into rounded beads occurred in runs on coke and washed coal through formation of an iron-rich, relatively low-melting matrix in which other ash is embedded. The matrix, a mixture consisting mainly of ferrous aluminum silicate, is formed by reaction of iron oxide with aluminosilicates (clay minerals) of the coal. Iron in coke is in a form suitable for this reaction to proceed. Iron in coal occurs mainly as pyrite, which loses half its sulfur to form ferrous sulfide when the coal is heated to bed temperature; the ferrous sulfide must then be oxidized to ferrous oxide before the reaction with the aluminosilicates can proceed. This oxidation occurred, and the ferrous aluminum silicate was formed in pilot plant tests with washed coal but not in tests with run-of-mine coal; however, the difference is attributed to differences in mode of operation rather than to the difference in feed. Themore » gas composition in the reactor bed is thermodynamically unfavorable for oxidation of the ferrous sulfide except at regions near the oxygen inlet. The ferrous sulfide oxidation and ash agglomeration achieved with washed coal are attributed to the introduction of a greater portion of the oxygen into the venturi area than in previous tests.« less

Publication Date:
Research Org.:
Institute of Gas Technology, Chicago, IL (USA)
OSTI Identifier:
6932337
Alternate Identifier(s):
OSTI ID: 6932337; Legacy ID: DE83003122
Report Number(s):
DOE/ET/13046-T79
ON: DE83003122
DOE Contract Number:  
AC02-77ET13046
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of document are illegible
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; ALUMINIUM SILICATES; CHEMICAL REACTIONS; ASHES; AGGLOMERATION; CHEMICAL COMPOSITION; MELTING POINTS; COKE; IRON COMPOUNDS; U-GAS PROCESS; ALUMINIUM OXIDES; CHEMISTRY; COAL GASIFICATION; DEMONSTRATION PLANTS; DENSITY; EXPERIMENTAL DATA; IRON OXIDES; IRON SULFIDES; OXIDATION; PARTICLE SIZE; PHASE DIAGRAMS; PYRITE; SILICON OXIDES; SOLID WASTES; ALUMINIUM COMPOUNDS; CHALCOGENIDES; DATA; DIAGRAMS; GASIFICATION; INFORMATION; MINERALS; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RESIDUES; SILICATES; SILICON COMPOUNDS; SIZE; SULFIDE MINERALS; SULFIDES; SULFUR COMPOUNDS; THERMOCHEMICAL PROCESSES; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; TRANSITION TEMPERATURE; WASTES 010404* -- Coal, Lignite, & Peat-- Gasification; 010600 -- Coal, Lignite, & Peat-- Properties & Composition

Citation Formats

Not Available. Ash chemistry in the U-GAS process: industrial medium-Btu fuel gas demonstration-plant program. United States: N. p., 1979. Web.
Not Available. Ash chemistry in the U-GAS process: industrial medium-Btu fuel gas demonstration-plant program. United States.
Not Available. Thu . "Ash chemistry in the U-GAS process: industrial medium-Btu fuel gas demonstration-plant program". United States.
@article{osti_6932337,
title = {Ash chemistry in the U-GAS process: industrial medium-Btu fuel gas demonstration-plant program},
author = {Not Available},
abstractNote = {The chemistry of the agglomeration of ash in IGT's U-GAS pilot plant runs on coke, run-of-mine Kentucky coal, and washed Kentucky coal has been investigated. Methods included optical and electron microscopy, chemical analyses, and fusibility tests. There is little difference in elemental composition of the ash among the three feeds. Agglomeration of ash into rounded beads occurred in runs on coke and washed coal through formation of an iron-rich, relatively low-melting matrix in which other ash is embedded. The matrix, a mixture consisting mainly of ferrous aluminum silicate, is formed by reaction of iron oxide with aluminosilicates (clay minerals) of the coal. Iron in coke is in a form suitable for this reaction to proceed. Iron in coal occurs mainly as pyrite, which loses half its sulfur to form ferrous sulfide when the coal is heated to bed temperature; the ferrous sulfide must then be oxidized to ferrous oxide before the reaction with the aluminosilicates can proceed. This oxidation occurred, and the ferrous aluminum silicate was formed in pilot plant tests with washed coal but not in tests with run-of-mine coal; however, the difference is attributed to differences in mode of operation rather than to the difference in feed. The gas composition in the reactor bed is thermodynamically unfavorable for oxidation of the ferrous sulfide except at regions near the oxygen inlet. The ferrous sulfide oxidation and ash agglomeration achieved with washed coal are attributed to the introduction of a greater portion of the oxygen into the venturi area than in previous tests.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {2}
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share: