Gas and steam turbine plant

Details Gas and steam turbine plant Gas and steam turbine plant

F - Mech Eng,Light,Heat,Weapons

01

K

F01K 23/06 (2006.01) F01K 23/10 (2006.01) F02C 3/20 (2006.01) F02C 3/28 (2006.01) F02C 3/30 (2006.01) F02C 3/32 (2006.01)

Patent

CA 2346474

In a gas and steam turbine plant (1), with a waste-heat steam generator (30) which is located downstream of a gas turbine (2) on the flue-gas side and the heating surfaces of which are connected into the water/steam circuit (24) of a steam turbine (20), for the integrated gasification of a fossil fuel (B) a gasification device (132) is located upstream of the combustion chamber (6) of the gas turbine (2) via a fuel line (130) . A gas and steam turbine plant (1) of this type is to be capable of being operated with particularly high plant efficiency even when oil is used as fossil fuel (B). For this purpose, according to the invention, a heat exchanger (150) is connected on the primary side into the fuel line (130), as seen in the direction of flow of the gasified fuel (B), upstream of a mixing apparatus (146) for admixing nitrogen (N2) to the gasified fuel (B), said heat exchanger being designed on the secondary side as an evaporator for a flow medium.

L'invention concerne une installation à turbine à gaz et à vapeur (1) comprenant un générateur de vapeur à chaleur perdue (30) qui est monté en aval de la turbine à gaz (2) côté gaz de combustion et dont les surfaces de chauffe sont raccordées au circuit eau-vapeur (24) d'une turbine à vapeur (20). Un dispositif de gazéification (132), monté en aval de la chambre de combustion (6) de la turbine à gaz (2) via une conduite de combustible (130), permet la gazéification intégrée d'un combustible fossile (B). Une telle installation à turbine à gaz et à vapeur (1) doit pouvoir fonctionner avec un rendement particulièrement élevé même si on utilise de l'huile comme combustible fossile (B). Selon l'invention, un échangeur de chaleur (150) est implanté dans la conduite de combustible (130) côté primaire vu dans le sens d'écoulement du combustible gazéifié (B) et en amont d'un dispositif mélangeur (146) qui permet de mélanger de l'azote (N2) au combustible gazéifié (B). Cet échangeur de chaleur (150) est conçu, côté secondaire, comme évaporateur d'un agent d'écoulement et est raccordé, côté vapeur, à la chambre de combustion (6) de la turbine à gaz.

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