公开(公告)号：EP1274926B1

公开(公告)日：2006-03-08

申请号：EP01922171.2

申请日：2001-03-23

Applicant: Sandvik Intellectual Property AB

Inventor： LINDSKOG, Nils

IPC: F01N11/00 ,  B01D53/94 ,  F01N3/20 ,  F02D41/14

CPC classification number: F01N11/00 ,  B01D53/9454 ,  B01D53/9495 ,  F01N13/008 ,  F01N13/009 ,  F01N2570/14 ,  Y02A50/2344 ,  Y02T10/22 ,  Y02T10/47

Abstract: A method of controlling the concentration of nitrogen oxides, hydrocarbons, and carbon monoxide in waste gases. A first lambda value (lambda1) of the air-fuel mixture is set to less than 1. The gases pass through a first catalyst and then through a second catalyst. The CO-concentration of the gases in the first catalyst is sufficiently high to reduce NO x to N 2 so that the NOx concentration is reduced to a predetermined value. Oxygen (O 2 ) is introduced between the first catalyst and the second catalyst to oxidize both CO and HC to CO 2 and H 2 O, to reduce the CO-concentration to a predetermined value. A second lambda value (lambda2) is measured in the gases downstream of the second catalyst, and a valve for regulating the air-fuel ratio is controlled so that the second lambda value (lambda2) lies within a predetermined range whose lower limit is higher than 1.

公开(公告)号：EP1024884B1

公开(公告)日：2005-09-14

申请号：EP98948008.2

申请日：1998-09-29

Applicant: Sandvik Intellectual Property AB

Inventor： LINDSKOG, Nils

IPC: B01D53/94 ,  F01N3/28 ,  F23C11/00 ,  F23C6/04

CPC classification number: F23C13/00 ,  B01D53/8656 ,  B01D53/8696 ,  B01D53/9409 ,  B01D53/944 ,  B01D53/9459 ,  B01D53/9495 ,  B01D2251/102 ,  B01D2251/204 ,  B01D2255/1021 ,  B01D2255/1023 ,  B01D2255/1025 ,  F01N3/22 ,  F01N13/009 ,  F01N13/0093 ,  F01N2570/14 ,  F23C3/002 ,  F23C6/04 ,  F23C13/08 ,  F23C2201/40 ,  Y02A50/2341 ,  Y02A50/2344

Abstract: A method of cleansing nitrogen oxide (NOx), hydrocarbon (HC) and carbon monoxide (CO) from waste gases, such as the waste gases or exhaust gases originating from burners and internal combustion engines. The waste gases, or exhaust gases, are passed through a catalyst for catalytic cleansing of the gases. The air-fuel ratio, or the lambda value (L), is reduced to a level below L=1. The gases are passed through a first catalyst and then through a second catalyst, to bring the CO-content of the gas in the first catalyst to a sufficiently high level and to reduce NOx to N2 to an extent such as to bring the NOx content down to a predetermined level. Sufficient oxygen (O2) is delivered to the gases at a point between the first and second catalysts to oxidize both CO and HC to CO2 and H2O to such an extent as to reduce the CO-content of the gas to a predetermined level. A gas burner to carry out the method is also disclosed.