Method for controlling a cooling process of turbine components
AssigneeSiemens Aktiengesellschaft
InventorStefan Riemann
Life of this patent
Estimating the term…
Abstract
A method for controlling a cooling process of turbine components of a steam turbine shaft, wherein an air flow mixed with a water mist is used to cool the turbine components during a mist cooling phase (P4) is provided. The mist cooling phase (P4) is preceded by an air cooling phase (P3), during which an air flow is used to cool the turbine components. A constant temporal temperature gradient is specified for the cooling process, wherein the air flow density is adjusted by the valve position of a controllable regulating valve and a switch is made from the air cooling phase (P3) to the mist cooling phase (P4) if the maximum air flow density is reached and in particular if the regulating valve is fully open.
Claims9
A method for controlling a cooling process of turbine components, comprising:
- during a mist cooling phase (P4), using an air stream with added water mist to cool the turbine components,
- wherein the mist cooling phase (P4) is preceded by an air cooling phase (P3) during which an air stream is used to cool the turbine components,
- wherein, during the air cooling phase (P3) and during the mist cooling phase (P4), a constant temperature gradient over time is specified for the cooling process,
- wherein a temperature gradient over time of about 10 K/h is specified,
- wherein, in order to specify the temperature gradient, the air stream density is regulated during the air cooling phase (P3) and the quantity of water mist added to the air stream is regulated during the mist cooling phase (P4),
- wherein the air stream density is set via the valve position of a controllable regulating valve,
- wherein a switch is made from the air cooling phase (P3) into the mist cooling phase (P4) when the maximum air stream density has been reached,
- wherein the mist cooling phase (P4) is preceded in the cooling process by a heat compensation phase (P2) in which temperature equalization of the turbine components with one another takes place,
- wherein, at the start of the cooling process, provision is made of a steam cooling phase (P1) during which steam is used to cool the turbine components,
- wherein, during the steam cooling phase (P1), a constant temperature gradient over time is specified for the cooling process, said temperature gradient differing from the temperature gradient during the air cooling phase (P3) and during the mist cooling phase (P4).
Dependencies are inferred from the claim text.