Combined cycle power plant and cooling steam supply method...

F - Mech Eng,Light,Heat,Weapons – 02 – C

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F02C 6/18 (2006.01) F01K 23/10 (2006.01) F02C 7/18 (2006.01)

Patent

CA 2257292

In combined cycle power plant comprising combination of gas turbine plant and steam turbine plant, gas turbine cooling steam temperature is adjusted appropriately so that gas turbine can be made of easily obtainable material. Steam supplied from intermediate pressure evaporator is mixed into cooling steam supply passage for supplying therethrough exhaust steam from high pressure steam turbine into gas turbine high temperature portion as cooling steam, thereby cooling steam temperature is lowered without lowering of entire efficiency and material of less heat resistant ability becomes usable as material forming the gas turbine high temperature portion to be cooled so that design and manufacture of the gas turbine may be satisfied by less expensive and easily obtainable material.

L'invention concerne une centrale électrique à cycle combiné, qui comprend une installation turbine à gaz (10) et une installation turbine à vapeur (40) associées, et dans laquelle la température de la vapeur de refroidissement est contrôlée de façon que la turbine puisse être fabriquée avec des matériaux faciles à se procurer. La vapeur provenant d'un évaporateur moyenne pression (26) est amenée à une conduite d'alimentation (14) en vapeur de refroidissement, qui amène un gaz de combustion provenant d'une turbine haute pression (41) à une partie haute température (11a) d'une turbine à gaz et servant de vapeur de refroidissement destinée à être mélangée audit gaz. On abaisse la température de la vapeur de refroidissement sans que cela diminue le rendement général, ce qui permet d'utiliser un matériau ayant une moins grande résistance à la chaleur pour former la partie haute température (11a) de la turbine à gaz qui est en contact avec une partie à refroidir. Un matériau relativement bon marché et facile à se procurer peut ainsi satisfaire aux exigences de la conception et de la fabrication.

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