Tubing wastage in fluidized-bed coal combustors (Grimethorpe PFBC (pressurized fluidized-bed combustion) Tube Bank E'')

Technical Report · Wed Oct 04 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/5452179· OSTI ID:5452179

Witherell, C. E.

Samples of evaporator tubing from Tube Bank E'' of the Grimethorpe pressurized fluidized-bed combustion (PFBC) facility in the UK were examined in the third of a series of studies being conducted at Lawrence Livermore National Laboratory (LLNL) under sponsorship of the US Department of Energy's Morgantown Energy Technology Center (METC). The program is being conducted to identify the mechanism or mechanisms responsible for metal loss (wastage) of in-bed carbon-steel evaporator tubes in bubbling-bed coal combustors. Results of examination suggest that bed conditions were less aggressive than in previous experiments in this combustor; however, tubing wastage was observed in some samples. Observations made on these tubes are consistent with the hypothesis of tubing wastage proposed in reports of previous LLNL studies conducted under this program that the dominant cause of metal loss is exfoliation of the normally-protective oxide scale by impacting bed particulates. Good correlation was also observed with trends noted earlier that microstructure of the tubing steel plays a role in its wastage response. 12 refs., 29 figs., 3 tabs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE/FE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5452179
• Report Number(s): UCRL-21232; ON: DE90003598
• Country of Publication: United States
• Language: English

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