Waste heat steam generator

F - Mech Eng,Light,Heat,Weapons – 22 – B

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F22B 1/18 (2006.01)

Patent

CA 2294710

So that, to achieve as high a plant efficiency as possible, a waste-heat steam generator (1), in particular for a combined-cycle power plant, with an number of heating surfaces (2,3,4), heatable by means of flue gas (RG) and carrying a medium (SW) to be heated, can be operated even at critical or supercritical pressure, a once-through evaporator (3) connected in countercurrent to the flue gas (RG) is provided on the medium side, the said evaporator being followed by a preheater (2) and preceded by a superheater (4) on the flue-gas side.

L'invention concerne un générateur de vapeur par récupération de chaleur perdue (1), en particulier pour un système de turbine à gaz et de turbine à vapeur, comprenant une pluralité de surfaces de chauffe (2, 3, 4) chauffées par des gaz de fumées (RG) et guidant un milieu de chauffe (SW). Afin d'obtenir un rendement aussi élevé que possible et d'avoir un bon régime de fonctionnement, même pour des pressions critiques et sur-critiques, l'invention est caractérisée en ce qu'il est prévu un évaporateur à écoulement forcé (3) monté, côté milieu de chauffe, à contre-courant par rapport aux gaz de fumées (RG), évaporateur vis-à-vis duquel est monté, côté gaz de fumées, en aval, un préchauffeur (2) et un surchauffeur (4) en amont.

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