Results from an experimental investigation of the mechanisms governing the ash aerosol size segre... more Results from an experimental investigation of the mechanisms governing the ash aerosol size segregated composition resulting from the combustion of pulverized coal in a laboratory scale down-flow combustor are described. The results of modeling activities used to interpret the results of the experiments conducted under his subtask are also described in this section. Although results from the entire program are included, Phase II studies which emphasized: (1) alkali behavior, including a study of the interrelationship between potassium vaporization and sodium vaporization; and (2) iron behavior, including an examination of the extent of iron-aluminosilicate interactions, are highlighted. Idealized combustion determination of ash particle formation and surface stickiness are also described.
TOXIC SUBSTANCES FROM COAL COMBUSTION -- A COMPREHENSIVE ASSESSMENT Quarterly Technical Report Re... more TOXIC SUBSTANCES FROM COAL COMBUSTION -- A COMPREHENSIVE ASSESSMENT Quarterly Technical Report Reporting Period: 10/01/1996 - 12/31/1996 Authors: LE Bool III; CL Senior; F. Huggins; GP Huffman; N. Shah; JOL Wendt; TW Peterson; AF Sarofim; I. Olmez ...
The work discussed in highlights the accomplishments of the sixth quarter of this two year projec... more The work discussed in highlights the accomplishments of the sixth quarter of this two year project. This includes University of Kentucky Moessbauer and computer controlled scanning electron microscopy (CCSEM) analysis of combustion ash samples generated by MIT and PSI Technologies (PSIT); a discussion of the MIT test results; a discussion of the University of Arizona`s ongoing efforts in drop tube reactor combustion testing; and additional analysis of ash deposition data by PSIT. Recently completed University of Kentucky analyses of combustion ash samples are presented. Specifically, Moessbauer analysis of a size graded sample of beneficiated Pittsburgh No. 8 coal was compared with the same analysis performed on a utility grind sample. A much lower percentage of sulfate was found in the size graded, <75 μm sample prepared by MIT than in the utility grind sample studied by PSIT. Moessbauer analysis of ash samples generated from combustion of this size-graded coal at MIT demonstrated increasing iron-containing glass formation with increasing oxygen partial pressure. CCSEM analyses of the Silverdale coal (United Kingdom, bituminous) and ash samples derived from this coal in combustion testing at PSIT are also presented. Iron aluminosilicate formation was observed for these samples.
The technical objectives of this project are: (a) To identify the effect of the mode-of-occurrenc... more The technical objectives of this project are: (a) To identify the effect of the mode-of-occurrence of toxic elements in coal on the partitioning of these elements among vapor, submicron fume, and fly ash during the combustion of pulverized coal, (b) To identify the mechanisms governing the post-vaporization interaction of toxic elements and major minerals or unburnt char, (c) To determine
Results from an experimental investigation of the mechanisms governing the ash aerosol size segre... more Results from an experimental investigation of the mechanisms governing the ash aerosol size segregated composition resulting from the combustion of pulverized coal in a laboratory scale down-flow combustor are described. The results of modeling activities used to interpret the results of the experiments conducted under his subtask are also described in this section. Although results from the entire program are included, Phase II studies which emphasized: (1) alkali behavior, including a study of the interrelationship between potassium vaporization and sodium vaporization; and (2) iron behavior, including an examination of the extent of iron-aluminosilicate interactions, are highlighted. Idealized combustion determination of ash particle formation and surface stickiness are also described.
TOXIC SUBSTANCES FROM COAL COMBUSTION -- A COMPREHENSIVE ASSESSMENT Quarterly Technical Report Re... more TOXIC SUBSTANCES FROM COAL COMBUSTION -- A COMPREHENSIVE ASSESSMENT Quarterly Technical Report Reporting Period: 10/01/1996 - 12/31/1996 Authors: LE Bool III; CL Senior; F. Huggins; GP Huffman; N. Shah; JOL Wendt; TW Peterson; AF Sarofim; I. Olmez ...
The work discussed in highlights the accomplishments of the sixth quarter of this two year projec... more The work discussed in highlights the accomplishments of the sixth quarter of this two year project. This includes University of Kentucky Moessbauer and computer controlled scanning electron microscopy (CCSEM) analysis of combustion ash samples generated by MIT and PSI Technologies (PSIT); a discussion of the MIT test results; a discussion of the University of Arizona`s ongoing efforts in drop tube reactor combustion testing; and additional analysis of ash deposition data by PSIT. Recently completed University of Kentucky analyses of combustion ash samples are presented. Specifically, Moessbauer analysis of a size graded sample of beneficiated Pittsburgh No. 8 coal was compared with the same analysis performed on a utility grind sample. A much lower percentage of sulfate was found in the size graded, <75 μm sample prepared by MIT than in the utility grind sample studied by PSIT. Moessbauer analysis of ash samples generated from combustion of this size-graded coal at MIT demonstrated increasing iron-containing glass formation with increasing oxygen partial pressure. CCSEM analyses of the Silverdale coal (United Kingdom, bituminous) and ash samples derived from this coal in combustion testing at PSIT are also presented. Iron aluminosilicate formation was observed for these samples.
The technical objectives of this project are: (a) To identify the effect of the mode-of-occurrenc... more The technical objectives of this project are: (a) To identify the effect of the mode-of-occurrence of toxic elements in coal on the partitioning of these elements among vapor, submicron fume, and fly ash during the combustion of pulverized coal, (b) To identify the mechanisms governing the post-vaporization interaction of toxic elements and major minerals or unburnt char, (c) To determine
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