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The Carbonation Behaviors of Limestone Particle in Oxygen-Fuel Circulating Fluidized Bed O2/CO2 Flue Gas

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DOI: 10.4236/jpee.2013.12002    3,256 Downloads   6,829 Views   Citations

ABSTRACT

Limestone powder is still applied as SO2 sorbent in emerging oxygen-fuel circulating fluidized bed boiler, but its carbonation in O2/CO2 flue gas is an unclear problem. For a better understanding of carbonation behaviors, the tube furnace heating system was built for simulating circulating fluidized bed boiler flue gas by regulating the supply of O, CO2, N2, SO2 and H2O, and Carbonation reaction was tested. Thermal gravimetric analysis and scanning electron microscopy were used. It was found that carbonation is closely related to temperature, CO2 concentration, impurities, water vapor, and cycle times; high temperature can promote carbonation process; high concentration of CO2 can inhibit the chemical reaction stage speed of carbonation process, but it has little effect on the final conversion rate; water vapor can increase the final conversion rate of carbonation; the cycle times will reduce the activity of carbonation. The presence of carbonation turns the traditional boiler flue gas indirect desulfurization model into indirect desulfurization mechanism which does not have a negative impact on SO2 removal efficiency.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Shang, J. , Liu, Z. and Wang, C. (2013) The Carbonation Behaviors of Limestone Particle in Oxygen-Fuel Circulating Fluidized Bed O2/CO2 Flue Gas. Journal of Power and Energy Engineering, 1, 1-7. doi: 10.4236/jpee.2013.12002.

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