Steam Generator for Combined Cycle Gas Turbine Plant

1 . A steam generator for the generation of steam from recovered heat from the flue gases of the gas cycle of a combined cycle gas turbine power plant comprising:

at least one high pressure drum;

at least one intermediate pressure drum;

at least one low pressure drum;

steam outlet means to enable extraction of auxiliary process steam from a location downstream of at least one of the said drums to supply an associated post combustion carbon capture plant with a source of motive power and/ or latent heat.

2 . A steam generator in accordance with claim 1 wherein the steam generator further comprises a fluid conduit fluidly continuous with the steam outlet means to convey auxiliary process steam to an associated post combustion carbon capture plant.

3 . A steam generator in accordance with claim 1 adapted such that in use process steam is drawn off to supply additional process module(s) of the combined cycle gas turbine power plant with a source of motive power and/or latent heat in that the steam generator further comprises a fluid conduit fluidly continuous with the steam outlet means to convey auxiliary process steam to such additional process module(s).

4 . A steam generator in accordance with claim 1 wherein at least one steam outlet means is provided downstream of the at least one low pressure drum.

5 . A combined cycle gas turbine power plant comprising:

at least one gas cycle generator;

a steam generator for the generation of steam from recovered heat from the flue gases of the gas cycle of a combined cycle gas turbine power plant comprising:

at least one high pressure drum;

at least one intermediate pressure drum;

at least one low pressure drum;

steam outlet means to enable extraction of auxiliary process steam from a location downstream of the at least one of the said drums;

a post-combustion carbon capture apparatus fluidly disposed to recover CO 2 from combustion gases generated by the power plant in use;

a fluid conduit fluidly continuous with the steam outlet means to convey auxiliary process steam to the post-combustion carbon capture apparatus.

6 . A plant in accordance with claim 5 wherein at least one steam outlet means is provided downstream of the at least one low pressure drum.

7 . A plant in accordance with claim 5 wherein the post-combustion carbon capture system comprises an absorber column where CO 2 is separated from the flue gas by means of absorption by passing the gas through a column where the gas flows in an opposite direction to an absorbent in liquid phase.

8 . A plant in accordance with claim 5 wherein the post-combustion carbon capture system further comprises a regeneration column where CO 2 is removed from absorbent by regenerative heating.

9 . A plant in accordance with claim 8 comprising a condenser reboiler is disposed to receive absorbent solution and reboil the solution to regenerate lean absorbent.