A method and system to extract gas from a gas turbine having at least one gas extraction mechanism placed at the turbine section that extracts exhaust gas directly from the turbine stages through the turbine casing, providing a first exhaust gas path that extends from the turbine section through the
A method and system to extract gas from a gas turbine having at least one gas extraction mechanism placed at the turbine section that extracts exhaust gas directly from the turbine stages through the turbine casing, providing a first exhaust gas path that extends from the turbine section through the exhaust section to the exhaust gas outlet, and a second exhaust gas path for extracted exhaust gas extending directly from the turbine stages inside the turbine casing to a duct outside of the turbine casing. The gas extraction system and method can be applied to a cogeneration system.
대표청구항▼
1. A gas turbine extraction assembly for a single-shaft gas turbine, comprising: the single-shaft gas turbine comprising a combustor in fluid communication with a turbine section;the single-shaft gas turbine including at least one turbine stage in the turbine section that is encased by a turbine cas
1. A gas turbine extraction assembly for a single-shaft gas turbine, comprising: the single-shaft gas turbine comprising a combustor in fluid communication with a turbine section;the single-shaft gas turbine including at least one turbine stage in the turbine section that is encased by a turbine casing, and an exhaust section connected to the turbine section having an exhaust outlet;at least one gas extraction mechanism placed at the turbine section that extracts exhaust gas from the at least one turbine stage through the turbine casing to produce extracted exhaust gas;a first exhaust gas path for a main exhaust gas; the first exhaust gas path is defined by the turbine casing of the turbine section; and extends from the turbine section through the exhaust section to the exhaust gas outlet to exit the single-shaft gas turbine; anda second exhaust gas path for the extracted exhaust gas that extends from the at least one turbine stage inside the turbine section, through the turbine casing via the at least one gas extraction mechanism, and towards an external environment outside the turbine casing, the second exhaust gas path bypasses the exhaust;at least one gas path junction located externally of the turbine casing;wherein the first exhaust gas path and the second exhaust gas path intersect at the at least one gas path junction, and the main exhaust gas and the extracted exhaust gas converge at the at least one gas path junction to produce a mixed exhaust gas;wherein the mixed exhaust gas is transported to a heat recovery steam generator separate from the turbine section and is applied as energy to produce work. 2. The assembly of claim 1, wherein a volume of the extracted exhaust gas is regulated by a valve that is operatively connected to the at least one gas extraction mechanism. 3. The assembly of claim 1, wherein the at least one gas extraction mechanism is a flange, a duct, a pipe, or a combination thereof. 4. The assembly of claim 1, wherein each of the at least one gas extraction mechanism is a set of one or more extraction pipes. 5. The assembly of claim 1, wherein each of the at least one gas extraction mechanism is placed directly at one of the at least one turbine stage. 6. The assembly of claim 1, wherein the at least one turbine stage of the turbine section includes 2 or more turbine stages: wherein the at least one gas extraction mechanism is placed in between two of the turbine stages. 7. A cogeneration system, comprising: a single-shaft gas turbine comprising a combustor in fluid communication with a turbine section;the single-shaft gas turbine including at least one turbine stage in the turbine section that is encased by a turbine casing, the turbine casing has a gas inlet at an upstream portion of the turbine section and an outlet at a downstream portion of the turbine section, and an exhaust section having an upstream portion that is connected to the outlet of the turbine section and a downstream portion that is connected to an exhaust gas outlet;at least one gas extraction mechanism placed at the turbine section that extracts exhaust gas from the at least one turbine stage through the turbine casing;a first exhaust gas path for a main exhaust gas defined by the turbine casing and the exhaust section; extending from the turbine section through the exhaust section to the exhaust gas outlet;a second exhaust gas path for an extracted exhaust gas that extends from the at least one turbine stage, through the turbine casing via the gas extraction mechanism, towards an external environment of the turbine casing, the second exhaust gas path bypasses the exhaust section;at least one gas path junction located externally of the turbine casing;wherein the first exhaust gas path and the second exhaust gas path intersect at the at least one gas path junction; and the main exhaust gas and the extracted exhaust gas converge at the at least one gas path junction to produce a mixed exhaust gas; anda heat recovery steam generator operatively connected downstream of the single-shaft gas turbine that receives the mixed exhaust gas from the at least one gas path junction and applies the energy from the mixed exhaust gas to generate steam. 8. The cogeneration system of claim 7, wherein the at least one turbine stage of the turbine section includes 2 to 4 or more turbine stages, the turbine stages are named from S1, S2, S3 to Sn. 9. The cogeneration system of claim 8, wherein the gas extraction mechanism is placed directly at or between the turbine stages in the turbine section. 10. The cogeneration system of claim 7, wherein the at least one gas extraction mechanism is regulated by a valve. 11. The cogeneration system of claim 7 further comprising a pipe connected to the at least one gas extraction mechanism that directs the extracted exhaust gas from the second exhaust gas path to converge with the main exhaust gas from the first exhaust gas path. 12. The cogeneration system of claim 7, wherein the at least one gas path junction is an inline gas mixer that is connected to the at least one gas extraction mechanism that directs the extracted exhaust gas from the second exhaust gas path to be mixed with the main exhaust gas from the first exhaust gas path. 13. The cogeneration system of claim 7, wherein the at least one gas extraction mechanism is a flange, a duct, a pipe, or a combination thereof. 14. A cogeneration system, comprising: a single-shaft gas turbine comprising a combustor in fluid communication with a turbine section;the single-shaft gas turbine having at least one turbine stage in the turbine section of the gas turbine that is enclosed inside a turbine casing, the at least one turbine stage is upstream of an exhaust section of the single-shaft gas turbine that is interconnected with the turbine section;at least one gas extraction mechanism that extends from the at least one turbine stage, through the turbine casing, to an external environment outside of the turbine casing;a main exhaust flow path that extends from the at least one turbine stage inside the turbine casing into the exhaust section, and exits the single-shaft gas turbine from an output of the exhaust section;an extracted exhaust flow path that extends from the at least one turbine stage inside the turbine casing and through the turbine casing via the at least one gas extraction mechanism to exit the single-shaft gas turbine, the extracted exhaust flow path bypasses the exhaust section; anda gas path junction located in the external environment outside of the turbine casing that joins the main exhaust flow path and the extracted exhaust flow path to form a mixed exhaust flow path, the gas path junction is directly connected to a heat recovery steam generator downstream from the single-shaft gas turbine;wherein the gas extraction mechanism is configured to extract exhaust gas directly from the at least one turbine stage and send extracted exhaust gas to the gas path junction;wherein the gas path junction is located immediately upstream of the heat recovery steam generator.
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