Nitrogen oxide removal control method

Details Nitrogen oxide removal control method Nitrogen oxide removal control method

1995-06-01

1996-11-19

Voeltz, Emanuel T.

Boots, shoes, and leggings

395907, 422111, 422168, B01D 5356

Patent

active

055769705

ABSTRACT:
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.

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K. H. Kraushaar et al., "Fuzzy-based controller improves denox performance in power plants," ABB Review, No. 9 (1993), pp. 13-20.

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