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US 9,752,773 B2Granted
Apparatus and method of controlling the thermal performance of an oxygen-fired boiler
AssigneeGeneral Electric Technology GmbH
InventorsArmand A. Levasseur, Shin G. Kang, James R. Kenney, Carl D. Edberg, David G. Turek
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Abstract
Disclosed herein is a method of controlling the operation of an oxy-fired boiler; the method comprising combusting a fuel in a boiler; producing a heat absorption pattern in the boiler; discharging flue gases from the boiler; recycling a portion of the flue gases to the boiler; combining a first oxidant stream with the recycled flue gases to form a combined stream; splitting the combined stream into several fractions; and introducing each fraction of the combined stream to the boiler at different points of entry to the boiler.
Claims31
A method of controlling the operation of an oxy-fired boiler;
- the method comprising:
- providing a fuel and transport gas stream to a main burner zone of a boiler;
- combusting the fuel from the fuel and transport gas stream in the boiler;
- discharging flue gas from the boiler;
- recycling a portion of the flue gas to the boiler;
- combining a first oxidant stream with the recycled flue gas to form a combined stream;
- splitting the combined stream into a plurality of independent split streams;
- introducing each independent split stream at a different elevation of the boiler;
- controlling independently an oxygen concentration of each of the independent split streams by adding a second oxidant stream to each respective independent split stream to form respective independent oxygen enriched split streams;
- introducing at least one of the independent oxygen enriched split streams into an array of nozzles associated with a designated zone of the boiler;
- and
- controlling independently an oxygen concentration at each of the nozzles in the array of nozzles;
- wherein the combined stream, the independent split streams, and the independent oxygen enriched split streams are separate from the fuel and transport gas stream;
- and
- wherein combining the first oxidant stream with the recycled flue gas to form the combined stream prior to splitting the combined stream into the plurality of independent split streams provides a uniform oxygen concentration in each of the independent split streams for introduction into the boiler in the event the second oxidant stream is not added to each respective independent split stream.
12 more elements
A method comprising:
- providing a fuel and transport gas stream to a main burner zone of a boiler;
- combusting the fuel from the fuel and transport gas stream in the boiler;
- discharging flue gas from the boiler;
- recycling a portion of the flue gas to the boiler;
- combining a first oxidant stream with the recycled flue gas to form a first combined stream;
- splitting the first combined stream into a plurality of independent split streams;
- adding a second oxidant stream to each respective independent split stream provided to the boiler to form respective independent oxygen enriched split streams;
- introducing a least one independent oxygen enriched split stream to an array of nozzle assemblies associated with a designated zone of the boiler;
- and
- controlling independently at least one of a concentration and distribution of oxygen in an input stream to the boiler from each nozzle assembly within the array of nozzle assemblies to vary the heat release profile of the boiler;
- wherein the first combined stream, the independent split streams, and the independent oxygen enriched split streams are separate from the fuel and transport gas stream;
- and
- wherein combining the first oxidant stream with the recycled flue gas to form the first combined stream prior to splitting the first combined stream into the plurality of independent split streams provides a uniform oxygen concentration in each of the independent split streams for introduction into the boiler in the event the second oxidant stream is not added to each respective independent split stream.
10 more elements
A method comprising:
- providing a fuel and transport gas stream to a main burner zone of a boiler;
- combusting the fuel from the fuel and transport gas stream in the boiler;
- discharging flue gas from the boiler;
- recycling a portion of the flue gas to the boiler;
- combining a first oxidant stream with the recycled flue gas to form a first combined stream;
- splitting the first combined stream into a plurality of separate independent split streams;
- introducing at least one of the plurality of independent split streams into an array of nozzle assemblies associated with a designated zone of the boiler;
- and
- controlling independently an oxygen concentration within at least one of the nozzle assemblies within the array such that the oxygen concentration within at least one nozzle assembly within the array is different from the oxygen concentration of another nozzle assembly within the array,
- wherein combining the first oxidant stream with the recycled flue gas to form the first combined stream prior to splitting the first combined stream into the plurality of independent split streams provides a uniform oxygen concentration in each of the independent split streams for introduction into the boiler.
7 more elements
Dependencies are inferred from the claim text.