Investigation of mineral transformations and ash deposition during staged combustion. Quarterly technical progress report, April 1, 1996--June 30, 1996
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.
- Research Organization:
- Brigham Young Univ., Provo, UT (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
- DOE Contract Number:
- FG22-93PC93226
- OSTI ID:
- 418225
- Report Number(s):
- DOE/PC/93226-T11; ON: DE97050777
- Resource Relation:
- Other Information: PBD: 1 Aug 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Investigation of mineral transformations and ash deposition during staged combustion. Quarterly technical progress report, July 1, 1995-- September 30, 1995
Investigation of mineral transformations and ash deposition during staged combustion. Quarterly technical progress report, April 1, 1997--June 30, 1997