DE2801247A1 - Catalytic afterburner for reducing carbon mon:oxide emission - comprises perforated tube located in catalyst bed, used in motor vehicles - Google Patents

Catalytic afterburner for reducing carbon mon:oxide emission - comprises perforated tube located in catalyst bed, used in motor vehicles

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Publication number
DE2801247A1
DE2801247A1 DE19782801247 DE2801247A DE2801247A1 DE 2801247 A1 DE2801247 A1 DE 2801247A1 DE 19782801247 DE19782801247 DE 19782801247 DE 2801247 A DE2801247 A DE 2801247A DE 2801247 A1 DE2801247 A1 DE 2801247A1
Authority
DE
Germany
Prior art keywords
catalyst bed
afterburner
motor vehicles
inner tube
tube located
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.)
Pending
Application number
DE19782801247
Other languages
German (de)
Inventor
Ludwig Dipl Ing Lang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LANG ORTULF GOETZ
Original Assignee
LANG ORTULF GOETZ
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LANG ORTULF GOETZ filed Critical LANG ORTULF GOETZ
Priority to DE19782801247 priority Critical patent/DE2801247A1/en
Publication of DE2801247A1 publication Critical patent/DE2801247A1/en
Pending legal-status Critical Current

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
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

Catalytic afterburner for use in motor vehicles to reduce CO emission at slow running speeds (50 km/hr) comprises a perforated inner tube located centrally in a catalyst bed. The inner tube is divided into 2 sections, viz. a conical section and a pref. cylindrical tubular section. The afterburner can be made small since it is designed only for partial CO oxidn. at low exhaust-gas flow rates to meet legal requirements for CO emission in cases where requirements for hydrocarbon and NOx emission can be met by engine modifications.

Description

Katalytisch oxidativ wirkender Einkammer-Nachbrenner fürCatalytically oxidative single-chamber afterburner for

Kraftfahrzeuge Die Erfindung betrifft eine spezielle Bauweise eines katalytisch oxidativ wirkenden Einkammer-Nachbrenners,wenn durch motorische Maßnahmen die Summe der Schadstoffanteile im Abgas an Kohlenwasserstoffen -CH - und Stickoxiden - NOx - in engen Grenzen erfüllt sind.Motor vehicles The invention relates to a special type of construction catalytically oxidative single-chamber afterburner, if by means of engine measures the sum of the pollutants in the exhaust gas of hydrocarbons -CH- and nitrogen oxides - NOx - are met within narrow limits.

So ist z.B. durch das Umwelt-Bundesamt,Berlin,eine Empfehlung für eine Schadstoffbegrenzung für das Jahr 1982 abgegeben worden.Hierbei wird ziim ersten P[al der Summenwer(CH + N()x) einx' geführt.Führt der getrennt nachzuweisenden Schadstoffanteil an Kohlenmonoxid-CO- sind niedrige Werte gefordert,die mit motorischen Mitteln schwer darzustellen sind.For example, the Federal Environment Agency, Berlin, recommends a pollutant limit for the year 1982 has been issued P [al der Summenwer (CH + N () x) einx '. Leads to the pollutant fraction to be detected separately low levels of carbon monoxide CO- are required, which are difficult with motor means are to be represented.

Nachzuweisen sind die Abgasschadstoffanteile in den Grenzen des EUROPA-Testes,d.h. bis zu einer Fahrgeschwindigkeit des Kraftfahrzeuges von 50 km/h.Für höhere Drehzahlen des Motors im Mittel und Vollastbereich bestehen keine gesetzlichen Vorschriften.The exhaust gas pollutant proportions within the limits of the EUROPA test must be proven, i.e. Up to a vehicle speed of 50 km / h. For higher speeds of the engine in the medium and full load range, there are no legal regulations.

Bauweisen für katalytische Nachbrenner,die aber die Abminderung der drei Schadstoffanteile in Abgas CO -Clf nnll NOx zum Ziele haben,sind in zahlreihenden Bauweisen bekannt.Construction methods for catalytic afterburner, but which reduce the three pollutant components in exhaust gas CO -Clf nnll NOx are aimed in numerous Known construction methods.

Aufgabe der Erfindung ist es, einen möglichst kleinen katalytisch oxidativ wirkenden Nachbrenner so auszubilden, daß er als Zusatzgerät dicht beim Motorabgassammler angeordnet werden kann und die engen Grenzen für den Schadstoffanteil CO unter Beachtung der kleinen Abgasmengen bei einem Fahrbereich bis 50 km/h erfüllt. The object of the invention is to catalytically as small as possible to train oxidatively acting afterburner so that it as an additional device close to Engine exhaust manifold can be arranged and the narrow limits for the proportion of pollutants CO, taking into account the small amounts of exhaust gas in a driving range of up to 50 km / h.

niese Aufgabe wird nach der Erfindung dadurch gelöst, daf3 bei einem katalytisch oxidativ wirkenden Einkammer-Nachbrenner für Kraftfahrzeuge, der nur zu einer Teiloxidation des Schadstoffanteils CO fiir den unteren betriebsbereich eines Motors dient, im Katalysatorenbett eine einzige, mittig angeordnete, aus Lochblechen bestehende Innenröhre vorhanden ist, die in zwei Abschnitte, nämlich einen kegelstumpfförmigen Teil und eine im wesentlichen oder vorzugsweise zylindrische Höhre unterteilt ist.Die Erfindung ist anhand eines Ausführungsbeispiels näher erläutert. This object is achieved according to the invention in that with one catalytically oxidative single-chamber afterburner for motor vehicles that only to a partial oxidation of the CO pollutant content for the lower operating range is used for an engine, in the catalyst bed a single, centrally arranged, made of perforated metal inner tube is present, which is in two sections, namely one frustoconical part and one substantially or preferably cylindrical The invention is explained in more detail using an exemplary embodiment.

Die Abb. zeigt einen Einkammer-Nachbrenner, der im Katalysatorenbett 5 eine mittig angeordnete, aus Lochblech bestehende Innenröhre aufweist, die in zwei Abschnitte, nämlich einen kegelstunpfförmigen Teil 1 und eine vorzugsweise zylindrische Höhre 3 unterteilt ist. diese Aufteilung erfolgt durch eine Blende 2, die zwischen den Teilen 1 und 3 angeordnet ist und ein wählbares Blende loch besitzt.Am anderen Ende der Röhre 3 ist ein Abschlußblech in Form eines Deckels 4, der gleichzeitig zur Zentrierung der Mittig angeordneten Innenröhre dient und auf dem hatalysatorenbett-Boden 6 befestigt ist.Der Boden 6 ist ebenfalls als Lochblech ausgebildet, durch das die Abgase dann in den Auslauftrichter 7 weitergelangen.The illustration shows a single-chamber afterburner in the catalyst bed 5 has a centrally arranged inner tube made of perforated sheet metal, which is shown in FIG two sections, namely a frustoconical part 1 and one preferably cylindrical hearing 3 is divided. this division is made by a diaphragm 2, which is arranged between parts 1 and 3 and a selectable aperture hole At the other end of the tube 3 is an end plate in the form of a cover 4, which also serves to center the centrally arranged inner tube and is attached to the hatalysatorenbett-Boden 6.Der Boden 6 is also as a perforated plate formed, through which the exhaust gases then pass into the discharge funnel 7.

Durch die Freifläche in der Lochblechwandung fließt ein Teil es zufließenden Abgases ab,ein anderer Anteil gleitet ab und wird von der Blende Teil 2 teilweise reflektiert,der dann ebenfalls huber die Freifläche im Teil 1 in das Katalysatorbett fließt.Part of it flows through the open space in the perforated sheet metal wall Exhaust gas from, another portion slides off and is partially from the diaphragm part 2 reflected, which then also hovers over the free space in part 1 into the catalyst bed flows.

Ein wählbar Anteil des Abgasstromes fließt durch das Blendenloch in die vorzugsweise zylindrischen Röhre Teil 3 ein.Durch die aus Lochblech bestehende Wandung des Teils 3 fließt ein Teil durch die Freifläche im Lochblech in das Katalysatorbett.Der Restanteil es Abgasstromes trifft auf den Abschlußdeckel Teil 4 auf,der gleichzeitig als Zentrierungsteil für den Einbau des Teils 3 dient.Durch den entstehenden Staudruck a'ilf der Fläche des Teils 4 wird dieser Anteil des Abgasstromes ebenfalls durch die Freifläche im Teil 3 dem Katalysatorbett zugeführt.A selectable proportion of the exhaust gas flow flows through the aperture in the preferably cylindrical tube part 3 ein.Durch which consists of perforated sheet metal Wall of part 3, a part flows through the open space in the perforated plate into the catalyst bed The remainder of the exhaust gas flow hits the cover part 4, which is at the same time serves as a centering part for the installation of part 3 due to the resulting back pressure A'ilf the area of the part 4, this portion of the exhaust gas flow is also through the free space in part 3 is fed to the catalyst bed.

Da eine Einflußnahme des Katalysatorbettes auf die Schadstoffanteile CH und NOx und untergeordneter Bedeutung ist,da der erforderliche Summenwert(CH + NOx)zur Erfüllung z.B.der Grenzwerte 1982 durch motorische Maßnahmen erreicht wird,ist es möglich einen kleinen Nachbrenner vorzusehen, der dann noch den Vorteil hat,daß dieser keine Einbauschwierigkeiten insbesondere für eine Nachrüstung von im Verkehr befindlichen Kraftfahrzeugen hat.Since an influence of the catalyst bed on the pollutant content CH and NOx and is of minor importance, since the required total value (CH + NOx) to meet e.g. the 1982 limit values achieved through engine measures it is possible to provide a small afterburner, which then has the advantage that this has no installation difficulties, especially for retrofitting motor vehicles in traffic.

e ee e

Claims (5)

Patentansprüche Ei Katalytisch oxidativ wirkender Einkammer-Nachbrenner für Kraftfahrzeuge, der nur zu einer Teiloxidation des Schadstoffanteils CO für den unteren Betriebsbereich eines Motors dient, dadurch gekennzeichnet, daß im Katalysatorenbett (5) eine mittig angeordnete, aus Lochblechen bestehende Innenröhre in zwei Abschnitte unterteilt ist, nämlich in einen kegelstunpfförmigen Teil (1) und eine vorzugsweise zylindrische Höhre (3). Claims Ei catalytically oxidative single-chamber afterburner for motor vehicles that only partially oxidize the CO pollutant serves the lower operating range of an engine, characterized in that in the catalyst bed (5) a centrally arranged inner tube made of perforated metal sheets in two sections is divided, namely into a frustoconical part (1) and one preferably cylindrical ear (3). 2. Nachbrenner nach Anspruch 1, dadurch gekennzeichnet, daß die Aufteilung in der Innenröhre durch eine Blende (2) erfolgt.2. Afterburner according to claim 1, characterized in that the division takes place in the inner tube through a diaphragm (2). 3. Nachbrenner nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Blende (2) zur Aufteilung der Teilgasmengen ein wählbares Blendenloch aufweist.3. Afterburner according to claim 1 and 2, characterized in that the orifice (2) has a selectable orifice hole for dividing the partial gas quantities. 4. Nachbrenner nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß an dem der Blende (2) gegenüberliegenden Ende der Höhre (3) ein Abschlußdeckel (4) angeordnet ist, der am Katalysatorenbett-Boden (b) befestigt ist.4. afterburner according to claim 1 to 3, characterized in that at the end of the tube (3) opposite the cover (2) a cover (4) is arranged, which is attached to the catalyst bed bottom (b). 5. Nachbrenner nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß der Katalysatorenbett-Uoden (U) aus einem Lochblech besteht.5. Afterburner according to claim 1 to 4, characterized in that the catalyst bed Uoden (U) consists of a perforated plate.
DE19782801247 1978-01-12 1978-01-12 Catalytic afterburner for reducing carbon mon:oxide emission - comprises perforated tube located in catalyst bed, used in motor vehicles Pending DE2801247A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19782801247 DE2801247A1 (en) 1978-01-12 1978-01-12 Catalytic afterburner for reducing carbon mon:oxide emission - comprises perforated tube located in catalyst bed, used in motor vehicles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782801247 DE2801247A1 (en) 1978-01-12 1978-01-12 Catalytic afterburner for reducing carbon mon:oxide emission - comprises perforated tube located in catalyst bed, used in motor vehicles

Publications (1)

Publication Number Publication Date
DE2801247A1 true DE2801247A1 (en) 1979-07-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2944841A1 (en) * 1979-11-07 1981-05-21 Degussa Ag, 6000 Frankfurt CATALYTIC EXHAUST GAS CONVERTER FOR INTERNAL COMBUSTION ENGINES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2944841A1 (en) * 1979-11-07 1981-05-21 Degussa Ag, 6000 Frankfurt CATALYTIC EXHAUST GAS CONVERTER FOR INTERNAL COMBUSTION ENGINES

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