Preservation method
AssigneeSiemens Aktiengesellschaft
InventorsUwe Juretzek, Michael Rziha, Edwin Gobrecht, Michael Schöttler
Life of this patent
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Abstract
A power plant and method for preserving a power plant, the power plant having a steam turbine with a shaft, further including a condenser mounted downstream of the steam turbine in the direction of flow of the steam, a vacuum pump mounted downstream of the condenser, a compressed steam system with shaft seals, and a compressed steam supply line extending into the shaft seals; a first nitrogen line extends into the condenser, and a second nitrogen line as well as a recirculation line that branches off the vacuum pump extend into the compressed steam supply line.
Claims14
A power plant comprising:
- a steam turbine with a shaft,
- a condenser connected downstream of the steam turbine in the direction of steam flow,
- a vacuum pump connected downstream of the condenser,
- a compressed steam system with shaft seals and a compressed steam supply line leading into the shaft seals,
- a first nitrogen line which leads into the condenser, and
- a second nitrogen line and a recirculation line branching off from the vacuum pump which lead into the compressed steam supply line.
A method for preserving a power plant comprising a steam turbine, a condenser connected downstream of the steam turbine, a vacuum pump connected downstream of the condenser and a compressed steam system, the method comprising:
- on shutdown of the steam turbine into a preserved state, feeding nitrogen into the compressed steam system and into the condenser, and bringing the steam turbine and the condenser to nitrogen overpressure and switching off the vacuum pump, and
- on start-up of the steam turbine, bringing the vacuum pump back into operation and branching off nitrogen at least for a time at the exhaust air of the vacuum pump and feeding the nitrogen to the compressed steam system.
Dependencies are inferred from the claim text.