Limestone(CaCO3)is nature's way of sequestration. CO2 + CaO(lime) = CaCO3. Coal burning plants are only about 45% efficient, leaving 55% going to waste heat. Can anyone here explain why that 55% of exhaust heat can't be mixed with lime dust to make CaCO3?
Remember we are talking about 4 to 6 million metric tons of CO2.
In order to make that much lime you need to decompose CaCO3 ...which only liberates more CO2...so you get no net gain. You just release the CO2 somewhere else.
CaCO3=CaO (lime) + CO2
By the way...you just gave me an idea. I'm going to try your suggestion next week at one of our coal plants and look for a CO2 reduction result. We have this very system in place to knock out the SO3 blue plume from our stacks.
I'll be in touch.