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US 12,716,366 B2Granted
Method of pre-operational cleaning of water and steam systems in combined cycle power plants and combined cycle power plant arranged therefor
AssigneeGE Vernova Infrastructure Technology LLC
InventorOlivier Antheaume
Life of this patent
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Abstract
A method of pre-operational cleaning of water and steam systems in a combined cycle power plant including a gas turbine engine, a steam turbine system, a condenser, and a heat recovery steam generator.
Claims20
A method of pre-operational cleaning of water and steam systems in a combined cycle power plant including a gas turbine engine, a steam turbine system, a condenser, and a heat recovery steam generator (HRSG), the method comprising:
- performing a pre-operational initial flushing and chemical cleaning operation on the water and steam systems of the combined cycle power plant, once finally constructed;
- firing the gas turbine engine and commissioning the gas turbine engine;
- while the gas turbine engine is being commissioned, performing a validation steam blow procedure including a steam blow operation, wherein steam is generated in the HRSG and blown at velocities, temperatures, and cleaning force ratio (CFR) conditions through a portion of a closed flow circuit for cleaning steam-carrying parts of the HRSG and steam lines connecting the HRSG to the steam turbine system, wherein the CFR is a function of a calculated flow during cleaning (Qc) divided by a maximum load flow (Qmax), wherein the steam is routed to bypass the steam turbine system via operational bypass lines, without using any temporary piping, and is discharged to the condenser;
- and
- monitoring and validating cleanliness of selected steam-blown steam lines.
2 more elements
A combined cycle power plant, comprising:
- a gas turbine engine for generating power;
- a heat recovery steam generator (HRSG) fluidly connected to the gas turbine engine for receiving exhaust gas produced from the generation of power in the gas turbine engine and configured for producing steam from the exhaust gas;
- a steam turbine system fluidly connected to the HRSG via steam lines for receiving steam produced in the HRSG and configured for producing additional power from the steam;
- a condenser coupled to the steam turbine system for condensing used steam output from the steam turbine system and a condensate system for returning condensate from the condenser to the HRSG;
- operational bypass lines fluidly connected between the steam lines and the condenser and arranged to bypass the steam turbine system;
- and
- a control system for controlling normal operation of the gas turbine engine, the HRSG, the steam turbine system, and the condenser for generating power under varying operating conditions, the control system being further configured to perform a pre-operational cleaning of water and steam systems in the combined cycle power plant by:
- firing the gas turbine engine and commissioning the gas turbine engine;
- while the gas turbine engine is being commissioned, performing a validation steam blow procedure including a steam blow operation, wherein steam is generated in the HRSG and blown at velocities, temperatures, and cleaning force ratio (CFR) conditions through a portion of a closed flow circuit for cleaning steam-carrying parts of the HRSG and steam lines connecting the HRSG to the steam turbine system, wherein the CFR is a function of a calculated flow during cleaning (Qc) divided by a maximum load flow (Qmax), wherein the steam is routed to bypass the steam turbine system via the operational bypass lines, without using any temporary piping, and is discharged to the condenser;
- and
- monitoring and validating cleanliness of selected steam blown steam lines.
8 more elements
Dependencies are inferred from the claim text.