A method for operating a gas turbine and a gas turbine for...

F - Mech Eng,Light,Heat,Weapons – 25 – J

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F25J 3/04 (2006.01) F02C 7/16 (2006.01)

Patent

CA 2618007

The invention relates to a method for operating a gas turbine (11) in a combined-cycle power plant (40), in which method air is sucked in and compressed by the gas turbine (11), which air is fed to a combustion chamber (18, 19) for the combustion of a synthesis gas which is obtained from coal, wherein a part of the compressed air is decomposed into oxygen and nitrogen. An improved degree of efficiency is achieved by the use of a gas turbine (11) with reheating, which gas turbine (11) has two combustion chambers (18, 19) and two turbines (16, 17), wherein synthesis gas is burnt in the first combustion chamber (18) with use of the compressed air and the hot gases which are produced are expanded in the first turbine (16), and wherein synthesis gas is burnt in the second combustion chamber with use of the gases which come from the first turbine (16) and the hot gases which are produced are expanded in the second turbine (17), and wherein the nitrogen which is produced during the decomposition of the air is used to cool the gas turbine (11).

L'invention concerne un procédé permettant d'actionner une turbine à gaz (11) dans une centrale mixte (40), selon lequel la turbine à gaz (11) aspire de l'air et le comprime et l'air comprimé est cheminé jusqu'à une chambre de combustion (18, 19), pour assurer la combustion d'un gaz de synthèse extrait du charbon. Une partie de l'air comprimé est décomposée en oxygène et en azote. Un meilleur rendement est obtenu, du fait qu'il est prévu d'utiliser une turbine à gaz (11) à surchauffe intermédiaire, qui comprend deux chambres de combustion (18) et deux turbines (16, 17). Un gaz de synthèse est brûlé dans la première chambre de combustion (18), avec l'air comprimé et les gaz chauds produits sont détendus dans la première turbine (16). Du gaz de synthèse est brûlé dans la seconde chambre de combustion avec les gaz provenant de la première turbine (16) et les gaz chauds produits sont détendus dans la seconde turbine (17). L'azote dégagé lors de la séparation de l'air est utilisé pour refroidir la turbine à gaz (11).

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