Control of steam temperature in combined cycle power plant
First Claim
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1. An apparatus, comprising:
- at least one timer, each timer corresponding with a respective firing mode of a gas turbine and configured to generate a timing signal when the corresponding respective firing mode is active;
at least one interpolation block, each interpolation block corresponding to each of the at least one timer and configured to generate an output signal when the corresponding respective firing mode is active; and
,a summation block receiving the output signal of each of the interpolation blocks and configured to generate a feed forward control signal that controls water injection rate of an attemperator.
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Abstract
A combined cycle power plant may include a gas turbine comprising a feed forward signal generator and configured to operate in one of one or more firing modes and generate exhaust gas and a heat recovery steam generator configured to receive the exhaust gas and extract thermal energy from the exhaust gas to generate steam. The feed forward signal generator may be configured to generate a feed forward signal that is used to control the temperature of the steam generated by the heat recovery steam generator.
157 Citations
14 Claims
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1. An apparatus, comprising:
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at least one timer, each timer corresponding with a respective firing mode of a gas turbine and configured to generate a timing signal when the corresponding respective firing mode is active; at least one interpolation block, each interpolation block corresponding to each of the at least one timer and configured to generate an output signal when the corresponding respective firing mode is active; and
,a summation block receiving the output signal of each of the interpolation blocks and configured to generate a feed forward control signal that controls water injection rate of an attemperator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A combined cycle power plant, comprising:
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a gas turbine configured to operate in one of one or more firing modes and generate exhaust gas that is used for generating steam, the gas turbine including a feed forward signal generator configured to generate at least one feed forward signal that is predictive of an expected steam temperature discontinuity due to a change in a firing mode of the gas turbine, the expected steam temperature discontinuity defined at least in part on the basis of stored data from permutations of firing mode changes, wherein the feed forward signal generator comprises one or more timers, each timer corresponding to a set of lit combustors in the gas turbine; and a heat recovery steam generator configured to receive the exhaust gas and extract thermal energy from the exhaust gas to generate steam, the heat recovery steam generator further configured to use the feed forward signal that is used to control the temperature of the steam generated by the heat recovery steam generator. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification