Combined cycle power generation
First Claim
1. A method of modifying a combined cycle power generation system of the type including, as equipment in the prior system configuration, one or more first gas turbines, one or more first steam turbines, and one or more existing heat recovery steam generators (HRSGs) each having been positioned to receive an output from the one or more of the first gas turbines, comprising the steps of:
- providing at least one second gas turbine of greater operating efficiency than each of the one or more first gas turbines; and
connecting at least one existing HRSG to receive exhaust output from the second gas turbine to generate steam.
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Accused Products
Abstract
A system (10) and method of modifying a combined cycle power generation system (12, 14, 16, 18). In one embodiment of the invention an existing system includes one or more first gas turbines, one or more first steam turbines, and one or more heat recovery steam generators (HRSGs). An exemplary method includes providing at least one second gas turbine of greater operating efficiency than each of the one or more first gas turbines and connecting at least one existing HRSG to receive exhaust output from the second gas turbine to generate steam. Also according to the invention a path is provided for mixing steam exiting a high pressure steam turbine with steam generated in a low pressure HRSG to route such mixed steam through a reheat section of a high temperature, high pressure HRSG so that reheated mixed steam exiting the reheat section can be routed into a low pressure steam turbine.
16 Citations
20 Claims
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1. A method of modifying a combined cycle power generation system of the type including, as equipment in the prior system configuration, one or more first gas turbines, one or more first steam turbines, and one or more existing heat recovery steam generators (HRSGs) each having been positioned to receive an output from the one or more of the first gas turbines, comprising the steps of:
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providing at least one second gas turbine of greater operating efficiency than each of the one or more first gas turbines; and connecting at least one existing HRSG to receive exhaust output from the second gas turbine to generate steam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for circulating a working fluid in a combined cycle power generation system of the type including a low efficiency, low output gas turbine, a low pressure steam turbine and a low pressure HRSG, comprising the steps of:
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incorporating a high efficiency gas turbine, a high pressure steam turbine and a high temperature high pressure HRSG into the system, and providing a path for mixing steam exiting the high pressure steam turbine with steam generated in the low pressure HRSG to route such mixed steam through a reheat section of the high temperature, high pressure HRSG so that reheated mixed steam exiting the reheat section can be routed into the low pressure steam turbine. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification