US 6,608,395 B1 · Hybrid combined cycle power generation facility

Abstract

A hybrid combined cycle power generation system for producing alternating current electric power. The system includes at least one industrial gas turbine and at least one aeroderivative turbine. The system may also include an HRSG and a steam turbine. Use of both an industrial gas turbine and an aeroderivative turbine permits the system to take advantage of the benefits of each type of turbine while diminishing the drawbacks associated with each type of turbine. The aeroderivative turbine is capable of quick startup and can therefore provide power relatively quickly. Thus the aeroderivative gas turbine can be relied on at startup to quickly begin producing power, while the industrial gas turbine, while the industrial gas turbine and steam turbine are brought online. Once online, the industrial gas turbine can be utilized for greater power production and longer running time. The aeroderivative turbine(s) may be used during periods of peak power demand and then shutdown when the demand decreases. In this way, both the industrial gas turbine and the steam turbine may operate at a relatively constant level, thereby increasing the stability and longevity of the system. Optional supplementary firing in the HRSGs can be utilized to produce additional steam which is directed to the steam turbine(s) to smooth transitions in power production levels as AD and IG turbines start and stop, or to produce additional power during short term peak power demand.

Claims9

Dependent claims

A system for producing alternating current electric energy comprising:

at least two turbines that are mechanically separate but electrically connected, said at least two turbines comprising:
(a) an industrial gas turbine type for producing electric power and having a first exhaust outlet;
(b) an aeroderivative gas turbine type for producing electric power and having a second outlet, the aeroderivative gas turbine type having a shorter start up time than the industrial gas turbine type;
(c) at least one electric generator powered by at least one said industrial gas turbine type or said aeroderivative gas turbine type;
(d) at least one heat recovery steam generator positioned to receive exhaust gases from the first outlet of the industrial gas turbine type and to receive exhaust gases from the second exhaust outlet of the aeroderivative gas turbine type;
and
(e) a steam turbine positioned to receive steam produced from said at least one heat recovery steam generator to thereby drive the steam turbine, the steam turbine being driven during start-up operations by said at least one heat recovery steam generator receiving exhaust gases from the aeroderivative gas turbine type, being driven during low demand operations by said at least one heat recovery steam generator receiving exhaust gases from the industrial gas turbine type, and being driven during high demand operations by said at least one heat recovery steam generator receiving exhaust gases from both the industrial gas turbine type and the aeroderivative gas turbine type.

4 more elements

Dependencies are inferred from the claim text.

Hybrid combined cycle power generation facility

Life of this patent

Hybrid combined cycle power generation facility

Life of this patent

Abstract

Claims9