Title:
STRATEGY FOR CONTROLLING NOX EMISSIONS AND AMMONIA SLIP IN AN SCR SYSTEM USING A NONSELECTIVE NOX/NH3 SENSOR
Document Type and Number:
WIPO Patent Application WO2006000877
Kind Code:
A3
Abstract:
One aspect of the invention relates to controlling the ammonia feed rate to an SCR reactor (103) using a NOx sensor (113) cross-sensitive to ammonia. The sensor (113), positioned downstream of the reactor (103), is interrogated by introducing a pulse in the ammonia feed rate. A positive response to a positive pulse indicates ammonia slip. A negative response to a positive pulse indicates NOx breakthrough. Another aspect of the invention related to a combination of feed-back and feed-forward control. Upon detecting ammonia slip, the controller (107) enters into an ammonia slip recovery mode (58) in which the ammonia feed rate is reduced for a period to restore the reactor's ammonia or NOx buffering capacity. After the recovery period, feed-forward control is restored, optionally with an updated control objective. A further aspect of the invention relates to a learning probabilistic model for feed-forward control trained according to the occurrence or non-occurrence of NOx breakthrough and ammonia slip.
Inventors:
CRANE MICHAEL E (US)
RADHAMOHAN SUBBARAYA (US)
RADHAMOHAN SUBBARAYA (US)
Application Number:
PCT/IB2005/001748
Publication Date:
June 08, 2006
Filing Date:
June 20, 2005
Export Citation:
Assignee:
EATON CORP (US)
CRANE MICHAEL E (US)
RADHAMOHAN SUBBARAYA (US)
CRANE MICHAEL E (US)
RADHAMOHAN SUBBARAYA (US)
International Classes:
F01N3/20; B01D53/90; B01D53/94; F01N3/28; F01N9/00; G01N35/08
Foreign References:
| US6455009B1 | 2002-09-24 | |||
| US6427439B1 | 2002-08-06 |
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