RU98104467A

RU98104467A - METHOD AND DEVICE FOR REDUCING THE CONTENT OF NITROGEN OXIDES IN THE EXHAUST GAS OF THE INTERNAL COMBUSTION ENGINE

Info

Publication number: RU98104467A
Application number: RU98104467/12A
Authority: RU
Inventors: Матес Виланд; Хофманн Лотар; Шеппе Детлев; Ахлайтнер Эрвин; Тост Райнер
Original assignee: Сименс Акциенгезелльшафт
Priority date: 1995-08-23
Filing date: 1996-08-22
Publication date: 2000-01-27

Claims

1. A method for reducing the content of nitrogen oxides in the exhaust gas (a) of an internal combustion engine (2), in which the exhaust gas (a), as well as the reagent (r) sprayed therein with compressed air (d), are fed to the catalyst (21) characterized in that the internal combustion engine (2) is loaded with blowing air by a supercharger (l ') and part of the blowing air (l') is branched and sent as compressed air (d) for spraying with a nozzle of a reagent (r).

2. The method according to claim 1, wherein the supercharger (8) is driven by a turbine (10) loaded with exhaust gas (a).

3. The method according to claim 1, wherein the supercharger (8) is driven directly by the internal combustion engine (2).

4. The method according to any one of the preceding paragraphs, wherein the reagent (r) is uniformly distributed in the exhaust gas (a) before the exhaust gas (a) reaches the catalyst (21).

5. The method according to claim 4, wherein the reagent (r) contains a substance which, after mixing the reagent (r) with the exhaust gas (a), decomposes to form ammonia, the ammonia causing a reaction with nitrogen oxides on the catalyst (21).

6. A device for reducing the content of nitrogen oxides in the exhaust gas (a) of the internal combustion engine (2), with a catalyst (21), to which the exhaust gas (a) is supplied and also to be sprayed in the exhaust gas (a) by means of compressed air (d ) a reagent (r), as well as with a spray device (22) for spraying a reagent (r), characterized in that a) an internal combustion engine (2) is assigned a supercharger (8) to create and supply pressurized air (l ') , and between the supercharger (8) and the internal combustion engine (2) ra a branch (26) is arranged through which a portion of the charge air (l ') can branch, and b) a branch (26) is connected to the spray device (22) so that the branch of the charge air (l') serves as compressed air (d ) for spraying the reagent (r).

7. The device according to claim 6, in which the discharge pipe (24) leading from the supercharger (8) to the internal combustion engine (2) is located directly on the internal combustion engine (2).

8. The device according to claim 6 or 7, in which the supercharger (8) refers to the exhaust gas turbocharger (4).

9. The device according to claim 6 or 7, in which the supercharger (8) is connected to the internal combustion engine (2) through a mechanical drive (30).

10. The device according to any one of paragraphs. 6 - 9, in which a charge air cooler (14) is provided between the supercharger (8) and the internal combustion engine (2) to cool the charge air (l ') and a branch (26) is located between the charge air cooler (14) and the internal combustion engine (2).

11. The device according to any one of paragraphs. 6-10, in which the catalyst (21) is designed to selectively catalyze the reaction between nitrogen oxides and a reducing agent, in particular ammonia.