Investigation of mineral transformations and ash deposition during staged combustion. Quarterly technical progress report, April 1, 1996--June 30, 1996

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This report describes work completed during the eleventh quarter of a DOE-funded study of mineral transformations and ash deposition during staged combustion. Accomplishments included repairs and improvements to the laboratory combustor, collection of deposits and observation of deposition behavior as a function of operating conditions, and analysis of deposit samples collected under both staged and conventional conditions. The water cooling shell for the brass burner was rebuilt this quarter. It was necessary to rebuild the cooling shell because of frequently occurring leaks which could no longer be repaired. No new leaks have occurred since the repairs were made. Deposits were ... continued below

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14 p.

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Harb, J.N. August 1, 1996.

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Description

This report describes work completed during the eleventh quarter of a DOE-funded study of mineral transformations and ash deposition during staged combustion. Accomplishments included repairs and improvements to the laboratory combustor, collection of deposits and observation of deposition behavior as a function of operating conditions, and analysis of deposit samples collected under both staged and conventional conditions. The water cooling shell for the brass burner was rebuilt this quarter. It was necessary to rebuild the cooling shell because of frequently occurring leaks which could no longer be repaired. No new leaks have occurred since the repairs were made. Deposits were collected for several stoichiometries between SR=0.65 and SR=0.75. A changeover from carbon-rich deposits to deposits which contained little carbon was observed at about SR=0.73 for the coal and natural gas feed rates used the experiments. However, even deposits which contained relatively little carbon had a carbon- enriched layer at the tube surface. This layer was due to carbon which did not burn out completely after impaction. A similar type of carbon layer may affect deposit formation in utility boilers. One of the key contributions this quarter was the analysis of deposit samples collected under both staged and conventional conditions. These initial results indicate that deposits formed during staged combustion of a Pittsburgh No. 8 are similar to those formed during conventional combustion. Some small differences were observed and it is not yet known how significant these differences may be. However, substantial differences between the deposits and ash samples were observed. These differences were apparent in both the bulk compositions and ``species`` distributions. Continuing work will focus on clarifying and quantifying the effect of staged combustion on deposit formation and strength development.

Physical Description

14 p.

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OSTI as DE97050777

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  • Other Information: PBD: 1 Aug 1996

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  • Other: DE97050777
  • Report No.: DOE/PC/93226--T11
  • Grant Number: FG22-93PC93226
  • DOI: 10.2172/418225 | External Link
  • Office of Scientific & Technical Information Report Number: 418225
  • Archival Resource Key: ark:/67531/metadc684208

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  • August 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 10, 2015, 7:56 p.m.

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Harb, J.N. Investigation of mineral transformations and ash deposition during staged combustion. Quarterly technical progress report, April 1, 1996--June 30, 1996, report, August 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc684208/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.