초록 ▼

Duct burner systems include a primary duct configured to receive a primary flow stream of exhaust gases from an exhaust duct and a secondary duct configured to receive a secondary flow stream of exhaust gases from the exhaust duct. Primary and secondary variable geometry diverters may be configured

Duct burner systems include a primary duct configured to receive a primary flow stream of exhaust gases from an exhaust duct and a secondary duct configured to receive a secondary flow stream of exhaust gases from the exhaust duct. Primary and secondary variable geometry diverters may be configured to allow and restrict the primary and secondary flow streams, respectively. A combustion system may receive the secondary flow stream, combine it with at least one low BTU fuel source, combust for heating the secondary flow stream, and re-inject the heated secondary flow stream into the primary duct. A blower may be used to blow the secondary flow stream through the combustion system. In addition, a system controller may be used to control the stoichiometric flow ratio between the low BTU fuel flow source and the secondary flow stream by actuating the primary and secondary variable geometry diverters.

대표청구항 ▼

1. A system, comprising: an exhaust duct configured to receive exhaust gases from a gas turbine;a primary duct configured to receive a primary flow stream of the exhaust gases from the exhaust duct;a secondary duct configured to receive a secondary flow stream of the exhaust gases from the exhaust d

1. A system, comprising: an exhaust duct configured to receive exhaust gases from a gas turbine;a primary duct configured to receive a primary flow stream of the exhaust gases from the exhaust duct;a secondary duct configured to receive a secondary flow stream of the exhaust gases from the exhaust duct;a primary variable geometry diverter configured to allow and restrict the primary flow stream into the primary duct;a secondary variable geometry diverter configured to allow and restrict the secondary flow stream into the secondary duct;a combustion system configured to combine the secondary flow stream with at least one fuel source, to combust the secondary flow stream, and to re-inject the heated secondary flow stream into the primary duct;a blower configured to blow the secondary flow stream through the combustion system; anda controller configured to control the stoichiometric flow ratio between the fuel source and the secondary flow stream by actuating the primary and secondary variable geometry diverters. 2. The system of claim 1, comprising a gas turbine coupled to the exhaust duct, wherein the exhaust gases are generated by the gas turbine. 3. The system of claim 1, comprising a heat recovery steam generation system configured to receive the heated secondary flow stream from the primary duct. 4. A system, comprising: a variable geometry diverter configured to operate in a path of exhaust gas from a gas turbine to a heat recovery steam generation system, wherein the variable geometry diverter comprises:a primary diverter configured to allow and restrict flow of the exhaust gas into the primary exhaust path; anda secondary diverter configured to allow and restrict flow of the exhaust gas into the secondary exhaust path; anda combustion system configured to combine the exhaust gas in the secondary exhaust path with at least one fuel source, to combust the exhaust gas in the secondary exhaust path, and to re-inject the heated gas radially inward into the primary exhaust path. 5. The system of claim 4, comprising a blower configured to blow the exhaust gas in the secondary exhaust path through the combustion system. 6. The system of claim 4, comprising a controller configured to control a flow and composition of the exhaust gas in the secondary exhaust path based on a stoichiometric flow ratio between the at least one fuel source and the exhaust gas in the secondary exhaust path. 7. The system of claim 6, wherein the controller is configured to control the flow and composition of the exhaust gas in the secondary exhaust path by actuating the variable geometry diverter. 8. The system of claim 6, wherein the controller is configured to control the flow and composition of the exhaust gas in the secondary exhaust path based on emissions from the combustion system. 9. The system of claim 4, comprising a supplementary air injector configured to add air into the exhaust gas in the secondary exhaust path. 10. The system of claim 4, comprising a heated air or heated oxidant system configured to add heated air or other oxidants into the exhaust gas in the secondary exhaust path. 11. The system of claim 4, wherein the variable geometry diverter comprises louvered diverter dampers, converging/diverging nozzle arrangements, or a combination thereof. 12. The system of claim 4, comprising a modular unit configured to mount in a duct between the gas turbine and the heat recovery steam generation system, wherein the modular unit comprises the variable geometry diverter, the primary exhaust path, the secondary exhaust path, the combustion system, or a combination thereof. 13. The system of claim 4, comprising a retrofit kit, wherein the retrofit kit comprises the variable geometry diverter, the primary exhaust path, the secondary exhaust path, the combustion system, or a combination thereof. 14. A method, comprising: diverting exhaust gas from a gas turbine engine between a primary duct and a secondary duct of using variable geometry primary and secondary diverters, wherein a primary flow stream is diverted into the primary duct and a secondary flow stream is diverted into the secondary duct;heating the secondary flow stream in a combustion system using a fuel to combust in the combustion system to produce a combustion flow stream; andre-injecting the combustion flow stream radially inward from the combustion system into the primary duct. 15. The method of claim 14, comprising controlling a position of the variable geometry primary and secondary diverters. 16. The method of claim 15, comprising controlling the primary and secondary flow streams based on a stoichiometric flow ratio between the fuel and the secondary flow stream. 17. The method of claim 14, comprising injecting a supplementary air stream into the secondary flow stream. 18. The method of claim 14, comprising blowing the secondary flow stream through the combustion system. 19. The method of claim 14, comprising adding heated air or heated oxidant to the secondary flow prior to combustion of the fuel.