Boiler flushing
AssigneeSiemens Energy Global GmbH & Co. KG
InventorsChristian Keune, Detlef Bock
Life of this patent
Estimating the term…
Abstract
A method for flushing a heat recovery steam generator in a power plant having a gas turbine, having a compressor, a combustion chamber and a turbine with a rotor, and having a generator coupled to the gas turbine and a start-up converter to convert from an alternating current of random frequency into an alternating current of a specified frequency. The start-up converter is connected to an output of the generator at which the alternating current of random frequency is applied. Wherein, when the gas turbine is run down, the rotor is cushioned with the help of the start-up converter at a boiler flushing speed and the heat recovery steam generator is further flushed until the specifications for flushing the waste heat steam generator are complied with.
Claims19
A method for flushing a heat recovery steam generator of a power plant with a gas turbine, comprising a compressor, a combustion chamber and a turbine with a rotor, and with a generator coupled to the gas turbine and a start-up converter for converting from an alternating current of any frequency into an alternating current of a specified frequency, wherein the start-up converter is connected to an output of the generator at which the alternating current of any frequency is applied, the method comprising:
- when the gas turbine is run down, supporting the rotor with the aid of the start-up converter at a boiler flushing speed and flushing the heat recovery steam generator further until specifications for flushing the heat recovery steam generator are satisfied,
- wherein, after reaching the boiler flushing speed of the gas turbine, a gas turbine speed is repeatedly raised to reach an upper threshold speed limit and lowered to reach a bottom threshold speed limit.
A method for flushing a heat recovery steam generator of a power plant with a gas turbine, comprising a compressor, a combustion chamber and a turbine with a rotor, and with a generator coupled to the gas turbine and a start-up converter for converting from an alternating current of any frequency into an alternating current of a specified frequency, wherein the start-up converter is connected to an output of the generator at which the alternating current of any frequency is applied, the method comprising:
- when the gas turbine is run down, supporting the rotor with the aid of the start-up converter at a rotational speed that is less than a nominal speed of the gas turbine and above a boiler flushing speed for a minimum duration to flush the heat recovery steam generator until explosive fuel mixtures and remains of unburned fuel are removed from the heat recovery steam generator,
- wherein, after reaching the boiler flushing speed of the gas turbine, a gas turbine speed is repeatedly raised to reach an upper threshold speed limit and lowered to reach a bottom threshold speed limit.
Dependencies are inferred from the claim text.