DE19604318A1 - Regenerating nitrogen dioxide adsorption catalyst - Google Patents
Regenerating nitrogen dioxide adsorption catalystInfo
- Publication number
- DE19604318A1 DE19604318A1 DE1996104318 DE19604318A DE19604318A1 DE 19604318 A1 DE19604318 A1 DE 19604318A1 DE 1996104318 DE1996104318 DE 1996104318 DE 19604318 A DE19604318 A DE 19604318A DE 19604318 A1 DE19604318 A1 DE 19604318A1
- Authority
- DE
- Germany
- Prior art keywords
- burner
- storage medium
- heating
- catalyst
- nitrogen dioxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
- F01N3/0878—Bypassing absorbents or adsorbents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2250/00—Combinations of different methods of purification
- F01N2250/12—Combinations of different methods of purification absorption or adsorption, and catalytic conversion
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Regenerierung eines NOx-Speicher katalysators gemäß dem Gattungsbegriff des Patentanspruches 1.The invention relates to a method for regenerating a NO x storage catalyst according to the preamble of claim 1.
Zur Reduzierung des NOx-Gehaltes von Abgasen einer Brennkraftmaschine ist es be kannt, das Abgas in einer ersten Phase über ein Speichermedium zu leiten, welches die Eigenschaft besitzt, das NOx zu adsorbieren. Diese Adsorption erfolgt nur dann, wenn das Abgas relativ kalt ist - beispielsweise zwischen 150°C und 350°C . In einer zweiten Phase, wenn das Abgas eine höhere Temperatur aufweist, wird NOx aus dem Speichermedium wieder ausgetrieben. Zur Reduktion wird das ausgetriebene NOx wieder in die Ansaugluft der Brennkraftmaschine zurückgeführt. Ein derartiges Ver fahren ist nur dann sinnvoll, wenn die Brennkraftmaschine nicht zu lange im Teillast bereich, also mit niedriger Abgastemperatur gefahren wird, da dann keine Regenerie rung des Speichermediums möglich ist und NOx ungehindert in die Umgebung ent weicht. Sehr nachteilig ist dieses Verfahren besonders bei Dieselmotoren, wo eine in nermotorische Reduktion des NOx wegen des hohen Sauerstoffüberschusses in weiten Betriebsbereichen äußerst problematisch ist.To reduce the NO x content of exhaust gases from an internal combustion engine, it is known to conduct the exhaust gas in a first phase via a storage medium which has the property of adsorbing the NO x . This adsorption only occurs when the exhaust gas is relatively cold - for example between 150 ° C and 350 ° C. In a second phase, when the exhaust gas has a higher temperature, NO x is driven out of the storage medium again. For reduction, the expelled NO x is returned to the intake air of the internal combustion engine. Such a method is only useful if the internal combustion engine is not operated for too long in the partial load range, i.e. with a low exhaust gas temperature, since then regeneration of the storage medium is not possible and NO x escapes unhindered into the environment. This process is particularly disadvantageous in diesel engines, where a reduction in NO x in the engine is extremely problematic in wide operating ranges because of the high excess of oxygen.
Ausgehend von einem Verfahren gemäß dem Gattungsbegriff des Patentanspruches 1 liegt der Erfindung die Aufgabe zugrunde, die Regenerierung des Speichermediums und die Reduktion von ausgetriebenen NOx so zu gestalten, daß das Verfahren insbesondere für Dieselmotoren anwendbar und man vom Betriebszyklus der Brennkraftmaschine weitgehend unabhängig ist.Based on a method according to the preamble of claim 1, the invention has for its object to design the regeneration of the storage medium and the reduction of driven NO x so that the method is particularly applicable to diesel engines and one is largely independent of the operating cycle of the internal combustion engine.
Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale des Patentanspru ches 1.This object is achieved by the characterizing features of the patent claim ches 1.
Durch die Verwendung eines Brenners kann das Speichermedium jederzeit regeneriert werden, unabhängig von der Betriebsweise der Brennkraftmaschine. Da der Brenner erfindungsgemäß stets mit einem Luftverhältnis von λ ≦ 1 betrieben wird, ist auch die Reduktion des NOx zu N₂ gesichert, ebenfalls unabhängig von der Betriebsweise der Brennkraftmaschine.By using a burner, the storage medium can be regenerated at any time, regardless of the operating mode of the internal combustion engine. Since the burner is always operated according to the invention with an air ratio of λ ≦ 1, the reduction of NO x to N₂ is also ensured, also regardless of the operating mode of the internal combustion engine.
Eine vorteilhafte Weiterbildung des Verfahrens zeichnet sich durch die Merkmale des Patentanspruches 2 aus. Durch die Verwendung zweiter Katalysatoren (Duplex- Ver fahren) kann kontinuierlich adsorbiert und regeneriert werden.An advantageous development of the method is characterized by the features of Claim 2 from. By using two catalysts (duplex ver driving) can be continuously adsorbed and regenerated.
Das erfindungsgemäße Verfahren zeichnet sich dadurch aus, daß die Adsorption von NOx bzw. die Regenerierung des Speichermediums und die Reduktion des NOx zu N₂ wechselweise, jedoch kontinuierlich möglich ist, losgelöst von der Betriebsweise der Brennkraftmaschine. Bei längeren Phasen im Teillastbereich, in denen nach dem Stand der Technik keine Regenerierung des Speichermediums durch die Abgastemperatur möglich ist, kann erfindungsgemaß mittels eines Brenners das NOx aus dem Spei chermedium ausgetrieben werden. Der Brenner wird dabei stets mit einem Luft verhältnis von λ ≦ 1 betrieben, so daß das durch Aufheizung mit dem Brenner ausgetretene NOx unmittelbar durch die Abgase des Brenners zu N₂ reduziert wird.The inventive method is characterized in that the adsorption of NO x or the regeneration of the storage medium and the reduction of NO x to N₂ is alternately, but continuously possible, detached from the operation of the internal combustion engine. For longer phases in the partial load range, in which, according to the prior art, no regeneration of the storage medium by the exhaust gas temperature is possible, the NO x can be expelled from the storage medium by means of a burner. The burner is always operated with an air ratio of λ ≦ 1, so that the NO x leaked by heating with the burner is reduced directly to N₂ by the exhaust gases of the burner.
Das erfindungsgemäße Verfahren ist besonders vorteilhaft bei Dieselmotoren anwend bar, welche in allen Lastbereichen mit Luftüberschuß arbeiten, wodurch eine Re duktion von NOx auf innermotorischem Wege nur sehr unvollkommen gelingt.The method according to the invention is particularly advantageous in the case of diesel engines which operate with excess air in all load ranges, as a result of which reduction of NO x by internal engine means is very incomplete.
Durch die Verwendung zweier Katalysatoren ist es möglich, vollkommen kontinuier lich zu arbeiten. Während einer der Katalysatoren NOx adsorbiert, kann der andere durch Aufheizung mittels des kleinen Brenners regeneriert werden, oder umgekehrt.By using two catalysts, it is possible to work completely continuously. While one of the catalysts is adsorbing NO x , the other can be regenerated by heating using the small burner, or vice versa.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996104318 DE19604318A1 (en) | 1996-02-07 | 1996-02-07 | Regenerating nitrogen dioxide adsorption catalyst |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996104318 DE19604318A1 (en) | 1996-02-07 | 1996-02-07 | Regenerating nitrogen dioxide adsorption catalyst |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19604318A1 true DE19604318A1 (en) | 1997-08-14 |
Family
ID=7784682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1996104318 Withdrawn DE19604318A1 (en) | 1996-02-07 | 1996-02-07 | Regenerating nitrogen dioxide adsorption catalyst |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19604318A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1013904A2 (en) * | 1998-12-22 | 2000-06-28 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine having lean NOx catalyst |
US7025810B2 (en) | 2004-01-13 | 2006-04-11 | Arvin Technologies, Inc. | Method and apparatus for shutting down a fuel-fired burner of an emission abatement assembly |
US7118613B2 (en) | 2004-01-13 | 2006-10-10 | Arvin Technologies, Inc. | Method and apparatus for cooling the components of a control unit of an emission abatement assembly |
EP1710409A1 (en) * | 2004-01-21 | 2006-10-11 | Yanmar Co., Ltd. | Exhaust gas purifier and method of control therefor |
US7243489B2 (en) | 2004-01-13 | 2007-07-17 | Arvin Technologies, Inc. | Method and apparatus for monitoring engine performance as a function of soot accumulation in a filter |
US7581389B2 (en) | 2004-01-13 | 2009-09-01 | Emcon Technologies Llc | Method and apparatus for monitoring ash accumulation in a particulate filter of an emission abatement assembly |
US7628011B2 (en) | 2004-01-13 | 2009-12-08 | Emcon Technologies Llc | Emission abatement assembly and method of operating the same |
US7685811B2 (en) | 2004-01-13 | 2010-03-30 | Emcon Technologies Llc | Method and apparatus for controlling a fuel-fired burner of an emission abatement assembly |
US7908847B2 (en) | 2004-01-13 | 2011-03-22 | Emcon Technologies Llc | Method and apparatus for starting up a fuel-fired burner of an emission abatement assembly |
US8641411B2 (en) | 2004-01-13 | 2014-02-04 | Faureua Emissions Control Technologies, USA, LLC | Method and apparatus for directing exhaust gas through a fuel-fired burner of an emission abatement assembly |
US8789363B2 (en) | 2007-06-13 | 2014-07-29 | Faurecia Emissions Control Technologies, Usa, Llc | Emission abatement assembly having a mixing baffle and associated method |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3534845A1 (en) * | 1985-09-30 | 1987-04-02 | Kraftwerk Union Ag | Process for reducing nitrogen oxides in the flue gas stream of a steam generator and steam generator in particular for this process |
EP0161470B1 (en) * | 1984-04-05 | 1988-07-20 | Linde Aktiengesellschaft | Process and apparatus for eliminating undesirable gaseous substances from fumes |
DE3917983A1 (en) * | 1989-06-02 | 1990-12-06 | Gaswaerme Inst Ev | Removing nitrogen oxide(s) from flue gases - by incorporating redn. gas and catalytically reducing |
EP0503882A1 (en) * | 1991-03-13 | 1992-09-16 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification system for an internal combustion engine |
EP0540280A1 (en) * | 1991-10-29 | 1993-05-05 | Toyota Jidosha Kabushiki Kaisha | Nitrogen oxides decreasing apparatus for internal combustion engine |
EP0581279A2 (en) * | 1992-07-30 | 1994-02-02 | Toyota Jidosha Kabushiki Kaisha | An exhaust gas purification device for an engine |
EP0582917A1 (en) * | 1992-08-04 | 1994-02-16 | Toyota Jidosha Kabushiki Kaisha | An exhaust gas purification device for an engine |
DE4404617A1 (en) * | 1994-02-14 | 1995-08-17 | Daimler Benz Ag | Selective nitrogen oxide reduction in exhaust gas |
-
1996
- 1996-02-07 DE DE1996104318 patent/DE19604318A1/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0161470B1 (en) * | 1984-04-05 | 1988-07-20 | Linde Aktiengesellschaft | Process and apparatus for eliminating undesirable gaseous substances from fumes |
DE3534845A1 (en) * | 1985-09-30 | 1987-04-02 | Kraftwerk Union Ag | Process for reducing nitrogen oxides in the flue gas stream of a steam generator and steam generator in particular for this process |
DE3917983A1 (en) * | 1989-06-02 | 1990-12-06 | Gaswaerme Inst Ev | Removing nitrogen oxide(s) from flue gases - by incorporating redn. gas and catalytically reducing |
EP0503882A1 (en) * | 1991-03-13 | 1992-09-16 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification system for an internal combustion engine |
EP0540280A1 (en) * | 1991-10-29 | 1993-05-05 | Toyota Jidosha Kabushiki Kaisha | Nitrogen oxides decreasing apparatus for internal combustion engine |
EP0581279A2 (en) * | 1992-07-30 | 1994-02-02 | Toyota Jidosha Kabushiki Kaisha | An exhaust gas purification device for an engine |
EP0582917A1 (en) * | 1992-08-04 | 1994-02-16 | Toyota Jidosha Kabushiki Kaisha | An exhaust gas purification device for an engine |
DE4404617A1 (en) * | 1994-02-14 | 1995-08-17 | Daimler Benz Ag | Selective nitrogen oxide reduction in exhaust gas |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1013904A2 (en) * | 1998-12-22 | 2000-06-28 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine having lean NOx catalyst |
EP1013904A3 (en) * | 1998-12-22 | 2001-12-12 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine having lean NOx catalyst |
US7581389B2 (en) | 2004-01-13 | 2009-09-01 | Emcon Technologies Llc | Method and apparatus for monitoring ash accumulation in a particulate filter of an emission abatement assembly |
US7118613B2 (en) | 2004-01-13 | 2006-10-10 | Arvin Technologies, Inc. | Method and apparatus for cooling the components of a control unit of an emission abatement assembly |
US7243489B2 (en) | 2004-01-13 | 2007-07-17 | Arvin Technologies, Inc. | Method and apparatus for monitoring engine performance as a function of soot accumulation in a filter |
US7025810B2 (en) | 2004-01-13 | 2006-04-11 | Arvin Technologies, Inc. | Method and apparatus for shutting down a fuel-fired burner of an emission abatement assembly |
US7628011B2 (en) | 2004-01-13 | 2009-12-08 | Emcon Technologies Llc | Emission abatement assembly and method of operating the same |
US7685811B2 (en) | 2004-01-13 | 2010-03-30 | Emcon Technologies Llc | Method and apparatus for controlling a fuel-fired burner of an emission abatement assembly |
US7908847B2 (en) | 2004-01-13 | 2011-03-22 | Emcon Technologies Llc | Method and apparatus for starting up a fuel-fired burner of an emission abatement assembly |
US8641411B2 (en) | 2004-01-13 | 2014-02-04 | Faureua Emissions Control Technologies, USA, LLC | Method and apparatus for directing exhaust gas through a fuel-fired burner of an emission abatement assembly |
EP1710409A1 (en) * | 2004-01-21 | 2006-10-11 | Yanmar Co., Ltd. | Exhaust gas purifier and method of control therefor |
EP1710409A4 (en) * | 2004-01-21 | 2010-09-29 | Yanmar Co Ltd | Exhaust gas purifier and method of control therefor |
US8789363B2 (en) | 2007-06-13 | 2014-07-29 | Faurecia Emissions Control Technologies, Usa, Llc | Emission abatement assembly having a mixing baffle and associated method |
US9328640B2 (en) | 2007-06-13 | 2016-05-03 | Faurecia Emissions Control Technologies, Usa, Llc | Emission abatement assembly having a mixing baffle and associated method |
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Legal Events
Date | Code | Title | Description |
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OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8139 | Disposal/non-payment of the annual fee |