From Sandy Henderson
Alan Bundy clearly hasn’t done the arithmetic when he proposes burying all flue gases (24 September, p 24). Emma Young may be correct, saying that separation of CO2 from flue gases of air-fed coal burners is currently prohibitively expensive (3 September, p 34), but oxygen separation from air is not. Closed-cycle burning using oxygen from an on-site air-separation plant would make CO2 separation much easier, improve combustion efficiency, and probably increase overall efficiency of the power station. Other pollutants would also be easier to process as they would not have to be separated from a large volume of nitrogen.
Dunblane, Perthshire, UK
