Method of operating a gas and steam turbine installation and...

F - Mech Eng,Light,Heat,Weapons – 01 – K

Patent

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F01K 25/00 (2006.01) F01K 23/10 (2006.01)

Patent

CA 2185558

The invention relates to a method for operating a gas-turbine and steam-turbine plant (1), in which the heat contained in the expanded working medium (A') from the gas turbine (2) is utilized to generate steam for the steam turbine (10) connected into a water/steam circuit (12), the working medium (A) for the gas turbine (2) being generated by the combustion of a fuel (B, B') along with the supply of compressed air (L). To increase the efficiency of the plant, provision is made, according to the invention, for the generated steam, before being introduced into the steam turbine (10), to be superheated by means of heat occurring during hydrogen/oxygen combus- tion. The plant (1) comprises a waste-heat steam genera- tor (14) which is located downstream of the gas turbine (2) on the exhaust-gas side and in which a number of heating surfaces (20 to 28) connected into the water/ steam circuit (12) of the steam turbine (10) are arranged, there being provided a hydrogen/oxygen burner (58) which is connected into the water/steam circuit (12) between the waste-heat steam generator (14) and the steam turbine (10).

L'invention concerne un procédé permettant de faire fonctionner une installation à turbines à gaz et à vapeur (1), selon lequel la chaleur contenue dans la substance de travail (A') détendue, provenant de la turbine à gaz (2), est utilisée pour produire de la vapeur pour la turbine à vapeur montée dans un circuit eau-vapeur (12). La substance de travail (A) de la turbine à gaz (2) est produite par combustion d'un combustible (B, B') sous apport d'air comprimé (L). Afin d'augmenter le rendement de l'installation, il est prévu, selon l'invention, de surchauffer la vapeur produite avant qu'elle ne soit introduite dans la turbine à vapeur (10), grâce à la chaleur produite au cours d'une combustion hydrogène-oxygène. L'installation (1) comprend un générateur de vapeur à chaleur perdue (14) monté en aval de la turbine à gaz (2), côté gaz évacués, dans lequel sont disposées un nombre de surfaces chauffantes (20 à 28) montées dans le circuit eau-vapeur (12) de la turbine à vapeur (10). Il est prévu un brûleur hydrogène-oxygène (58) monté dans le circuit eau-vapeur (12), entre le générateur de vapeur à chaleur perdue (14) et la turbine à vapeur (10).

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