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Vibration and Earthquake Isolation

Nitrogen-oxide-removal-control-method

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Nitrogen oxide removal control method

Details

Inventors: Goto, Yasuo;
Assignee: Kabushiki Kaisha Toshiba (Kanagawa-ken, JP)
Primary Examiner: Voeltz; Emanuel T.
Assistant Examiner: Choi; Kyle J.
Attorney, Agent or Firm: Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.

A plant with a gas turbine such as a combined cycle power plant of a gas turbine cycle and a steam turbine cycle is provided with a nitrogen oxide removal device for removing NO.sub.x by injecting ammonia to an exhaust gas of the gas turbine. The device reduces NO.sub.x concentration to a certain value or less before the exhaust gas is released to the air. An ammonia flow amount is rapidly controlled such that a mole ratio of ammonia to NO.sub.x coincides with a set mole ratio value. The mole ratio is calculated from a predicted NO.sub.x concentration at an inlet of the nitrogen oxide removal device predicted by calculating operation conditions of the gas turbine, an ammonia flow amount value, and an exhaust gas flow amount. The set mole ratio value is calculated from a deviation of a measured NO.sub.x concentration value at an outlet of the nitrogen oxide removal device and a set NO.sub.x concentration value, and an amount of water injected to a combustor. Finally, a controlled system is stabilized in a state where a measured NO.sub.x concentration value coincides with the set NO.sub.x concentration value at a high speed.

DETAILED DESCRIPTION An object of the invention is to provide a nitrogen oxide removal control apparatus and method for removing nitrogen oxide by injecting ammonia into an exhaust gas flow from a gas turbine, which overcomes the above drawbacks of the related art.
Another object of the invention is to provide a nitrogen oxide removal control apparatus and method capable of properly controlling a nitrogen oxide concentration in an exhaust gas from a gas turbine even in single shaft type combined cycle power plants of a gas turbine cycle and a steam turbine cycle where it is difficult to correctly judge load change of the gas turbine, separately.
Still another object of the invention is to provide a nitrogen oxide removal control apparatus and method for an exhaust gas from a gas turbine with the excellent control performance independently of change in the gas turbine conditions, the apparatus and method using a measured NO.
sub.
x concentration signal, a representing state signal of a NO.
sub.
x reducing means in a combustor of the gas turbine, an ammonia flow amount signal, and a predicted NO.
sub.
x concentration signal calculated from a state value of a gas turbine as control factors.
Further still another object of the invention is to provide a nitrogen oxide removal control apparatus and method for an exhaust gas from a gas turbine where feedback control based on the measured NO.
sub.
x concentration signal and feedforward control based on a representing state signal of a NO.
sub.
x reducing means are fused by using the fuzzy theory.
The first aspect of the present invention provides a nitrogen oxide removal control apparatus comprising a predicted mole ratio operating system, a mole ratio setting system, and a mole ratio control system.
The predicted mole ratio operating system provides a predicted mole ratio of ammonia to NO.
sub.
x in an exhaust gas on the basis of a predicted NO.
sub.
x concentration value at an inlet of the nitrogen oxide removal device which value is calculated from state values of a gas turbine, a value of the exhaust gas flow amount, and a value of the ammonia flow amount injected into this exhaust gas

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