Patent ID: 7516620

Claim:
A module based oxy-fuel boiler system comprising: a first boiler having a feedwater inlet in flow communication with a plurality of tubes for carrying the water, the tubes forming at least one water wall, the first boiler configured to substantially prevent the introduction of air; a first boiler oxygen supply for supplying oxygen having a purity of greater than 21 percent; a first boiler carbon based fuel supply for supplying a carbon based fuel; at least one first boiler oxy-fuel burner system, the first boiler oxy-fuel burner system feeding the oxygen and the carbon based fuel into the first boiler in a near stoichiometric proportion to one another to limit an excess of either the oxygen or the carbon based fuel to a predetermined tolerance, wherein the first boiler tubes are configured for direct, radiant energy exposure for energy transfer to the water to produce steam; a second boiler having a plurality of tubes, the second boiler being in series with the first boiler and configured to carry out a different energy transfer function than the first boiler, the tubes in the second boiler forming at least one tube wall, the second boiler configured to substantially prevent the introduction of air; a second boiler oxygen supply for supplying oxygen having a purity of greater than 21 percent; a second boiler carbon based fuel supply for supplying a carbon based fuel; at least one second boiler oxy-fuel burner, the second boiler oxy-fuel burner feeding the oxygen and the carbon based fuel into the second boiler in a near stoichiometric proportion to one another to limit an excess of either the oxygen or the carbon based fuel to a predetermined tolerance, wherein the second boiler tubes are configured for direct, radiant energy exposure for energy transfer to produce steam, and wherein the first and second boilers are independent of and in series with one another, further including an economizer having a gas side and a feedwater side, wherein exhaust gases from the first and second boiler flow into the economizer gas side and wherein feedwater flows through the economizer and into the feedwater inlet.