Desulfurization of boiler flue gas by means of activated calcium oxide

The research including two sorbents produced by the activation of quicklime, transforming calcium oxide into calcium hydroxide and calcium carbonate proved by means of a reactor with a static layer that temperature significantly limits their chemisorption reactivities during the capture of sulfur dioxide from boiler flue gas from coal combustion and biomass co-combustion or sorted municipal flues and brown coal. An increased desulfurization reactivity was demonstrated with a product with a lower hydroxide and higher carbonate content. Its sorption activity was proven to be significantly higher at 110 °C than at 130 °C and 150 °C. The desulfurization was getting stronger with the decrease of the difference of Sorbacal application temperature to the dew point of flue gasses.

► Chemisorption activities of two sorbents were modeled. ► Sorbacal with a lower CaO content desulfurizes better than with a higher CaO. ► Sorbacal with a lower content of bound water desulfurizes flue gas better. ► Chemisorption of SO2 by Sorbacals from flue gas is higher at 130 than at 150 °C. ► Chemisorption of Sorbacal SP is increased when the temperature is reduced to 110 °C.