Hydration reaction chemistry associated with management of pressurized fluidized bed combustion ash
- Western Research Inst., Laramie, WY (United States)
The chemistry of the hydration of pressurized fluidized bed combustion (PFBC) ash directly controls the nature of the geotechnical properties of the ash in ash management scenarios, such as disposal and ash re-use. The ashes from PFBC technologies are distinctly different from those generated by atmospheric fluidized bed combustion (AFBC) technologies. Equilibrium conditions exist between sorbent calcination and recarbonation reactions at the pressures and temperatures typical of PFBC units, resulting in low free lime and high calcium carbonate contents in PFBC ash. Ashes from the AEP Tidd high-sulfur bituminous coal-fired bubbling PFBC and the Karhula low-sulfur subbituminous coal-fired circulating PFBC pilot plant have been tested in laboratory, in order to correlate the hydration reaction chemistry to the observed geotechnical properties of strength and expansion. The study concluded that a number of hydration reactions, involving the formation of gypsum and ettringite are involved in the hydration chemistry of PFBC ashes. The hydration reaction kinetics and final hydration products were shown to be dependent on ash characteristics, lime availability, and curing conditions.
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC21-93MC30127
- OSTI ID:
- 357847
- Report Number(s):
- CONF-9705116--; ISBN 0-7918-1557-9
- Country of Publication:
- United States
- Language:
- English
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