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Calcination and desulfurization characteristics of calcium carbonate in pressurized oxy-combustion

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  • Dai, Gaofeng
  • Zhang, Jiaye
  • Wang, Xuebin
  • Tan, Houzhang
  • Rahman, Zia ur

Abstract

Pressurized oxy-combustion is one of the most promising and efficient CO2 capture technologies for coal-fired power plants, which could reduce energy consumption for carbon capture. However, due to the effects of pressurization and flue gas recirculation, the partial pressure of sulfur oxides (SOx) in pressurized oxy-combustion is significantly higher than that of air-combustion, which leads to the corrosion risks and environment hazards. It is essential to investigate the SOx control in pressurized oxy-combustion. In this paper, the in-furnace calcination and desulfurization characteristics of calcium carbonate in pressurized oxy-combustion were carried out in a pressurized drop tube furnace. The findings show that the sulfation reaction in pressurized oxy-combustion is direct sulfation and the sulfation rate increases with the increase of temperature and pressure. The desulfurization efficiency in pressurized oxy-combustion is lower than that in atmospheric air atmosphere below 950 °C, but it reverses above 950 °C, indicating that the minimum desulfurization temperature in the furnace of the pressurized oxy-combustion is higher than that of atmospheric air atmosphere. Therefore, limestone can still be used as a sorbent in the pressurized oxy-combustion furnace. This study could contribute to the design of dry desulfurization systems in pressurized oxy-combustion combustors that use fossil fuel energies with high efficiency and low SOx emissions.

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  • Dai, Gaofeng & Zhang, Jiaye & Wang, Xuebin & Tan, Houzhang & Rahman, Zia ur, 2022. "Calcination and desulfurization characteristics of calcium carbonate in pressurized oxy-combustion," Energy, Elsevier, vol. 261(PA).
    • Handle: RePEc:eee:energy:v:261:y:2022:i:pa:s0360544222020448
    DOI: 10.1016/j.energy.2022.125150
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    References listed on IDEAS

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    1. de Diego, L.F. & de las Obras-Loscertales, M. & Rufas, A. & García-Labiano, F. & Gayán, P. & Abad, A. & Adánez, J., 2013. "Pollutant emissions in a bubbling fluidized bed combustor working in oxy-fuel operating conditions: Effect of flue gas recirculation," Applied Energy, Elsevier, vol. 102(C), pages 860-867.
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    1. Kalisz, Sylwester & Wejkowski, Robert & Maj, Izabella & Garbacz, Przemysław, 2023. "A novel approach to the dry desulfurization process by means of sodium bicarbonate: A full-scale study on SO2 emission and geochemistry of fly ash," Energy, Elsevier, vol. 279(C).

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