Patent ID: 8082737

Claim:
A module based oxy-fuel boiler system for producing steam from water, comprising: a first boiler for receiving feedwater and converting said feedwater to steam and a second boiler in series with said first boiler for receiving said steam from said first boiler and superheating said steam, wherein said second boiler carries out a different energy transfer function than the first boiler and said first and second boilers are independent of each other; said first boiler comprising: a feedwater inlet for receiving feedwater a plurality of first boiler tubes for receiving said feedwater and forming at least one water wall, said feedwater inlet in flow communication with said plurality of first boiler tubes, 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, a first boiler oxy-fuel burner system for receiving said carbon based fuel and said oxygen having a purity of greater than 21 percent; a first boiler control system for feeding the oxygen and the carbon based fuel into the first boiler oxy-fuel burner system 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; said second boiler comprising: a steam inlet for receiving steam from said first boiler; a plurality of second boiler tubes in flow communication with said steam inlet forming at least one tube wall for receiving said steam from said first boiler, wherein the second boiler configured to substantially prevent the introduction of air; a second boiler oxygen supply for supplying oxygen having a purity of greater then 21 percent; a second boiler carbon based fuel supply for supplying a carbon based fuel; at least one second boiler oxy-fuel burner for receiving said carbon based fuel and said oxygen having a purity of greater than 21 percent; the second boiler control system for feeding the oxygen and the carbon based fuel into the second boiler oxy-fuel burner 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.