Denitrification control device

Abstract

Abstract PURPOSE:To enhance economy as well as effectiveness in operations with a device, which is to remove NOx from the exhaust gas of an exhaust heat collecting boiler for a gas tunbine, by providing possibility to perform two controls simultaneously as in a single body, i.e. the control for suppression of NOx amount using water etc. and the control for removal of NOx by means of a denitrating device. CONSTITUTION:In an arrangement in which a fuel is combusted in a combustor 2 under intervention of the compressed air fed from a compressor 1 and the gas generated shall drive a gas turbine, and in which the exhaust gas is introduced to an exhaust heat collecting boiler 8, water is injected in the combustor 2 through an injection rate adjusting valve 5 so as to suppress the NOx production in the combustor 2. The boiler 8 is equipped with a denitrating device 13, into which ammonium is injected through a rate-of-flow adjusting valve 6 so as to remove NOx from the exhaust gas. Here the change in the rate of NOx removal at this denitrating device 13 is sensed, and the setting value for the amount of ammonium injection is corrected on the basis of the amount of change thus sensed. When this amount of change has exceeded a certain level, the setting value for the rate of water injection is corrected on the basis of this deviation.

Inventors

• 👤 Yoshifumi Yamaguchi
• 👤 山口　麗文

Bibliographic Details