Combined cycle power plant having improved cooling and...

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

Patent

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F01K 23/10 (2006.01)

Patent

CA 2351856

An improved combined cycle power plant (10) having a plurality of kettle boilers (30, 31, 32) used in sequence for cooling the compressed air being directed via line (29) to cool portions of the gas turbine (20). The kettle boilers remove heat from the compressed air and produce a plurality of steam flows in lines (70, 71, 73) at pressures in parallel with the heat recovery steam generator (41, 42, 43) steam flows. Steam in line (72) for cooling other portions of the gas turbine is maintained at a very high level of purity by providing a high rate of blowdown through line (65) from the steam drum (45) providing the steam. Heat from the blowdown flow is directed to heat exchanger (66) to heat incoming fuel gas from source (26), or alternatively to heat the condensate via line (74) during periods of fuel oil operation.

La présente invention concerne une centrale électrique à cycles combinés perfectionnée (10) comportant plusieurs chaudières à eau chaude (30, 31, 32) utilisées en séquence pour refroidir l'air comprimé dirigé via une conduite (29) pour refroidir des parties de la turbine à gaz (20). Les chaudières à eau chaude éliminent la chaleur contenue dans l'air comprimé, et produisent plusieurs écoulements de vapeur dans les conduits (70, 71, 73) à des pressions parallèles aux écoulements de vapeur du générateur de vapeur de récupération (41, 42, 43). On maintient la vapeur de la conduite (72) destinée à refroidir les autres parties de la turbine à gaz à un très grand niveau de pureté en effectuant une purge rapide dans la conduite (65) provenant du tambour à vapeur (45) qui fournit la vapeur. La chaleur issue de l'écoulement de purge est dirigée vers l'échangeur de chaleur (66) afin de chauffer le gaz de combustion provenant de la source (26), ou dans une variante, chauffer le condensat via la conduite (74) lors des périodes de fonctionnement avec le combustible liquide.

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