B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/56 (2006.01) B01D 53/74 (2006.01) B01D 53/86 (2006.01) B01D 53/90 (2006.01)
Patent
CA 2415813
The present invention relates to an NH3 injection rate control technique for suppressing an NO X concentration to below a desired NO X concentration through the use of an NH3 injection rate reaching a minimum. In the NH3 injection rate control method for an NO X removal apparatus according to the invention, an operating area of the NO X removal apparatus is divided into a first area in which a molar ratio of an NH3 injection rate with respect tc an NO X flow rate at an inlet of the NO X removal apparatus is smaller than a molar ratio at a minimum point where an NO x concentration assumes a minimum value and a second area in which the molar ratio vs equal to or larger than the minimum point molar ratio, and a virtual NO X concentration with respect to the molar ratio is set according to a virtual characteristic line which varies monotonicallv to stride across a desired operating point without rising with an increase of the molar ratio from the first area to the second area. Moreover, feedback control is implemented for adjusting the NH3 injection rate with respect to the NO X flow hate on the basis of a deviation between a desired NO X concentration and the virtual NO X concentration in a direction that the virtual NO X concentration is brought close to the desired NO X concentration.
Hattori Akira
Iida Kozo
Kouno Susumu
Onishi Toshiyuki
Suzuki Kenji
Gowling Lafleur Henderson Llp
Mitsubishi Heavy Industries Ltd.
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