Researchers at the Massachusetts Institute of Technology say a shorter-term solution, with cheaper start-up costs, could help spread the use of carbon capture and storage at coal plants and still clean up a large amount of carbon dioxide.
Although CCS has been touted as the answer to the problem of cleaning up coal, there are still no full-scale commercial plants using the system, in part because it carries a hefty price tag for power companies. Carbon capture alone, not including transporting and storing the CO2, can boost the cost of a power plant by 30 to 60 percent, depending on the type of plant. It can also decrease plant efficiency, according to the study, raising the cost per kilowatt-hour.
The researchers said partial capture, for both pulverized coal and integrated gasification combined cycle plant (aka “clean coal”), represents a smaller capital investment, because smaller or fewer pieces of equipment are necessary. Full capture, defined as 90 percent of emissions captured, is often accomplished with two trains of carbon dioxide absorbers and strippers, while a single train can be used for partial capture up to a certain level, according to the study. It won’t help with operating costs, though. Once the plant is up and running, the MIT study showed that the cost per ton for operating a power plant with CCS is about the same at 60 percent capture as at 90 percent.


Compared to his colleagues at the 


