Studies on slag steel interactions in the formation of utility boiler and entrained gasifier deposits
Thesis/Dissertation
·
OSTI ID:5199927
Two laboratory-scale devices were utilized to investigate the slag-steel interaction that occurs in slag deposition processes. Sticking apparatus investigations were conducted to study both upper furnace waterwall slag deposition in a pulverized coal (pc)-fired utility boiler and ash deposit formation on heat exchange surfaces in an entrained slagging gasifier. The drop-tube furnace study was limited to the former. In the first sticking apparatus investigation, test variables were altered to simulate changing utility boiler furnace operating conditions. The effect of increasing flame temperature, steel temperature, and changing time on adhesion to oxidized boiler steels was studied. In a second investigation, a study of the sticking behavior of slag drops obtained from three Pennsylvania steam coals was conducted on oxidized medium carbon steel. This included separation of the pc into specific gravity (sg) fractions and testing of low-temperature ash (LTA) in the sticking apparatus. Also, mineral mixtures were formulated to simulate hypothetical minerals in pc particles. The objective of the third sticking-test investigation was to study the fundamental mechanism of ash deposition on heat exchanger surfaces in slagging gasifiers compared to utility boilers where experience is more extensive.
- Research Organization:
- Pennsylvania State Univ., University Park (USA)
- OSTI ID:
- 5199927
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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