EAP - Oil Shale publications

PUBLISHED
SINCE 1984

Oil Shale

ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)

Impact Factor (2022): 1.9

CALCULATION OF THE AMOUNT OF ESTONIAN OIL SHALE PRODUCTS FROM COMBUSTION IN REGULAR AND OXY-FUEL MODE IN A CFB BOILER; pp. 211–224

PDF | doi: 10.3176/oil.2014.3.02

Authors

ALAR KONIST, LAURI LOO, ALEKSANDR VALTSEV, BIRGIT MAATEN, ANDRES SIIRDE, Dmitri Neshumayev, TÕNU PIHU

Abstract

Oxy-fuel combustion is considered as one of the promising carbon capture and storage (CCS) technologies for coal-fired boilers. In oxy-fuel combustion, the combustion gases are oxygen and the recirculating flue gas, and the main components of the combustion gas are O₂, CO₂ and H₂O [1].
The paper presents the results of the calculation of the flue gas amount during combustion of oil shale using oxy-fuel technology in a circulated fluidized bed (CFB) mode. The calculations were performed for different oil shale heating values and different recycled flue gas (RFG) ratios. Oxy-fuel combustion with flue gas recycling was found to enable the decrease of the extent of carbonate minerals decomposition (ECD), thereby increasing the amount of heat released per 1 kg of fuel. To minimize ECD, the recycled flue gas ratio should be maintained at a level higher than 0.7. This condition allows an increase of the partial pressure of CO₂ over the equilibrium state line of calcite decomposition reaction at the bed temperature. The decrease of ECD was observed up to k_CO2-min= 0.28 The decrease of k_CO2 leads to an additional increase in the amount of heat released during oil shale combustion per 1 kg and, depending on the mean lower heating value (LHV), the heat can be increased up to 0.34 MJ/kg.
A comparison with the bituminous and anthracite coals revealed that the specific emission of CO₂ per input fuel energy for oil shale is expected to be even smaller compared with those of the considered coals.

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