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For anthracites and petroleum cokes, the typical combustion temperature in a circulating fluidized bed (CFB) is > 900 °C. At CO2 concentrations of 80–85 % (typical of oxy‐fuel CFBC conditions), limestone still calcines. When the ash which includes unreacted CaO cools to the calcination temperature, carbonation of fly ash deposited on cool surfaces may occur. At the same time, indirect and direct...
This work explores the sonochemical-enhanced carbonation of FBC ash for direct disposal in landfills. Tests have been conducted using four ashes originating from three commercial CFBC boilers. Experiments with additives such as NaCl and seawater have also been carried out. Tests were performed at low (20°, 40°C) and high (60°, 80°C) temperatures. Sonicated samples were analyzed using TGA, TGA–FTIR...
Fluidized bed combustor (FBC) ashes from high-sulfur, low-ash fuels, can agglomerate if subjected to sulfating conditions for long enough (days to weeks). The degree of sulphation increases with both temperature and time under these conditions, and at a conversion equivalent to the production of 50-60% or more of CaSO 4 in the deposit the ashes agglomerate. Fly ash agglomerates less readily...
The high CaO content of FBC ashes causes difficulties with their management. The use of CO 2 to recarbonate or pacify the ashes was suggested in order to increase the concentration of CaCO 3 in the ashes and decrease the amount of free lime. Work was performed using a Cahn 1100 pressurized TGA on coal and petroleum coke FBC residues at 0.1 and 1.1MPa. Both hydrated and nonhydrated...
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