DE102007020561A1 - Exhaust system and fuel cell system - Google Patents
Exhaust system and fuel cell system Download PDFInfo
- Publication number
- DE102007020561A1 DE102007020561A1 DE102007020561A DE102007020561A DE102007020561A1 DE 102007020561 A1 DE102007020561 A1 DE 102007020561A1 DE 102007020561 A DE102007020561 A DE 102007020561A DE 102007020561 A DE102007020561 A DE 102007020561A DE 102007020561 A1 DE102007020561 A1 DE 102007020561A1
- Authority
- DE
- Germany
- Prior art keywords
- line
- exhaust
- branch
- main exhaust
- lambda probe
- 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- Withdrawn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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0444—Concentration; Density
- H01M8/0447—Concentration; Density of cathode exhausts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/20—Sensor having heating means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04037—Electrical heating
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Die Erfindung betrifft eine Abgasführung mit einem Hauptabgasstrang (10), einer von dem Hauptabgasstrang abzweigenden ersten Abzweigleitung (12) und einer von dem Hauptabgasstrang abzweigenden zweiten Abzweigleitung (14), die beide zu einer außerhalb des Hauptabgasstrangs angeordneten Lambdasonde (16) führen, wobei, bezogen auf die Strömungsrichtung des Abgases durch den Hauptabgasstrang, die erste Abzweigleitung (12) stromaufwärts der zweiten Abzweigleitung (14) von dem Hauptabgasstrang (10) abzweigt. Die Erfindung betrifft weiterhin ein Brennnstoffzellensystem.The invention relates to an exhaust system with a main exhaust line (10), a first branch line (12) branching off from the main exhaust line and a second branch line (14) branching off from the main exhaust line, both leading to a lambda probe (16) arranged outside the main exhaust line, wherein With respect to the flow direction of the exhaust gas through the main exhaust line, the first branch line (12) branches off from the main exhaust line (10) upstream of the second branch line (14). The invention further relates to a fuel cell system.
Description
Die Erfindung betrifft eine Abgasführung und ein Brennstoffzellensystem.The The invention relates to an exhaust system and a fuel cell system.
Die Handhabung von Abgasen spielt in vielen technischen Gebieten eine große Rolle. Insbesondere wird vielfach die Abgaszusammensetzung, speziell der Sauerstoffgehalt im Abgas, gemessen. Diese Information ist im Hinblick auf die Schadstoffemission und die Steuerung beziehungsweise Regelung der dem Abgasstrang vorgeordneten Systeme nützlich.The Handling of exhaust gases plays a role in many technical fields size Role. In particular, the exhaust gas composition often becomes special the oxygen content in the exhaust gas, measured. This information is in With regard to the pollutant emission and the control respectively Regulation of the exhaust system upstream systems useful.
Allerdings begegnet man bei der Sauerstoffmessung mit der Lambdasonde Problemen, da die Sondenspannung von verschiedenen Parametern abhängt, die sich als Störgrößen erweisen können. Dabei ist insbesondere die Temperatur im Bereich der Lambdasonde kritisch, da diese direkt linear in den gemessenen Spannungswert eingeht. Dies ist ein geringes Problem bei Systemen, die eine nahezu konstante beziehungsweise relativ niedrige Abgastemperatur liefern. Schwankt die Abgastemperatur jedoch beträchtlich und insbesondere bis auf hohe Werte, so wird das Ergebnis der Lambdamessung in nicht mehr hinnehmbarer Weise verfälscht. Eine große Schwankungsbreite bei der Abgastemperatur und hohe Temperaturen des Abgases können insbesondere dann auftreten, wenn die Abgasführung vergleichsweise kurz ist, so dass die Lambdasonde relativ nah an der Wärmequelle im System angeordnet ist. Dies ist insbesondere bei kompakt bauenden Brennstoffzellensystemen der Fall, wo nur ein vergleichsweise kurzer Abgasstrang vorliegt, der im Allgemeinen an einen exotherm arbeitenden Nachbrenner anschließt.Indeed you encounter problems with oxygen measurement with the lambda probe, because the probe voltage depends on different parameters, the prove to be disturbances can. there In particular, the temperature in the region of the lambda probe is critical, since this is directly linearly included in the measured voltage value. This is a minor problem with systems that are nearly constant or provide relatively low exhaust gas temperature. varies However, the exhaust gas temperature considerably and in particular to high values, then the result of the lambda measurement corrupted in an unacceptable way. A large fluctuation range at the exhaust gas temperature and high temperatures of the exhaust gas can in particular then occur when the exhaust system is comparatively short, so the lambda probe is relatively close to the heat source is arranged in the system. This is especially true for compact fuel cell systems the case where there is only a comparatively short exhaust tract, which generally connects to an exothermic afterburner.
Der Erfindung liegt die Aufgabe zugrunde, die Verfälschung der Lambdamessung aufgrund von Temperatureffekten zu vermeiden.Of the Invention is based on the object, the falsification of the lambda measurement due to avoid temperature effects.
Diese Aufgabe wird mit den Merkmalen der unabhängigen Ansprüche gelöst.These The object is achieved by the features of the independent claims.
Vorteilhafte Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen angegeben.advantageous embodiments of the invention are in the dependent claims specified.
Die Erfindung besteht in einer Abgasführung mit einem Hauptabgasstrang, einer von dem Hauptabgasstrang abzweigenden ersten Abzweigleitung und einer von dem Hauptabgasstrang abzweigenden zweiten Abzweigleitung, die beide zu einer außerhalb des Hauptabgasstrang angeordneten Lambda sonde führen, wobei, bezogen auf die Strömungsrichtung des Abgases durch den Hauptabgasstrang, die erste Abzweigleitung stromaufwärts der zweiten Abzweigleitung von dem Hauptabgasstrang abzweigt. Auf diese Weise wird eine Zwangsströmung des Verbrennungsabgases zu der außerhalb des Hauptabgasstrangs angeordneten Lambdasonde erzeugt, wobei der Bereich um die Lambdasonde und die Lambdasonde selbst dann nicht mehr in übermäßiger Weise durch die Temperatur der Abgase beeinflusst werden. Die Lambdasonde kann auf diese Weise an nahezu beliebigen Orten positioniert werden. Die Anordnung der Abzweigleitungen an verschiedenen Strömungskoordinaten des Hauptabgasstrangs entspricht der Anordnung eines Prandtlschen Staurohrs, das heißt eines strömungstechnischen Messinstrumentes zur Bestimmung eines Staudruckes.The Invention is an exhaust system with a main exhaust line, a branching from the main exhaust branch first branch line and a second branch line branching from the main exhaust branch, both to an outside the main exhaust line arranged Lambda lead probe, wherein, based on the flow direction of the exhaust gas through the main exhaust line, the first branch line upstream the second branch line branches off from the main exhaust line. On this way becomes a forced flow the combustion exhaust gas to the outside of the main exhaust line arranged lambda probe generated, wherein the area around the lambda probe and the lambda probe is then no longer excessive in temperature the exhaust gases are influenced. The lambda probe can do this way be positioned at almost any location. The arrangement of Branch pipes at different flow coordinates of the main exhaust line corresponds to the arrangement of a Prandtl pitot tube, that is one fluidic Measuring instrument for determining a dynamic pressure.
Nützlicherweise ist vorgesehen, dass der Lambdasonde eine Heizeinrichtung zugeordnet ist. Die Heizeinrichtung bringt die Lambdasonde auf Betriebstemperatur. Diese liegt im Allgemeinen höher als die Temperatur des Abgases, welches über die Abzweigleitung zur Lambdasonde geleitet wird. Folglich kann das Abgas keine Temperaturerhöhung der Lambdasonde und somit keine Verfälschung der Messergebnisse aufgrund von Temperatureffekten mehr bewirken.Usefully it is provided that the lambda probe assigned a heating device is. The heater brings the lambda probe to operating temperature. This is generally higher than the temperature of the exhaust gas, which via the branch line to Lambda probe is passed. Consequently, the exhaust gas can not increase the temperature of the lambda probe and thus no falsification cause more of the measurement results due to temperature effects.
Es kann vorgesehen sein, dass die Abzweigleitungen zu einem Messvolumen führen, das durch ein die Lambdasonde aufnehmendes Gehäuse begrenzt ist. Die Abzweigleitungen können dabei von dem Gehäuse trennbare Bauteile sein oder auch einstückig mit dem Gehäuse ausgebildet vorliegen.It can be provided that the branch lines to a measuring volume to lead, which is limited by a lambda probe receiving housing. The branch lines can doing so from the case be separable components or integrally formed with the housing available.
Ebenfalls ist es möglich, dass die Abzweigleitungen direkt miteinander verbunden sind und die Lambdasonde aufnehmen. Die Abzweigleitungen stellen dann ein einheitliches Rohr dar, das gleichzeitig das Messvolumen für die Lambdasonde zur Verfügung stellt.Also Is it possible, that the branch lines are directly connected to each other and pick up the lambda probe. The branch lines then stop uniform pipe, which at the same time the measuring volume for the lambda probe to disposal provides.
Die Erfindung betrifft weiterhin ein Brennstoffzellensystem mit einer erfindungsgemäßen Abgasführung. Bei Brennstoffzellensystemen ist die Überwachung der Abgaswerte besonders nützlich, und aufgrund der kurzen Wege bei kompakten System ist es vom besonderen Vorteil, wenn Maßnahmen zur Verfügung stehen, die eine Beeinflussung der Lambdamessung durch die Temperatur der Abgase vermeiden.The The invention further relates to a fuel cell system with a exhaust system according to the invention. at Fuel cell systems is the monitoring of exhaust emissions particularly useful, and Due to the short ways with compact system it is of the special Advantage if action to disposal stand, which affect the Lambdamessung by the temperature avoid the exhaust gases.
Die Erfindung wird nun mit Bezug auf die begleitende Zeichnung anhand einer bevorzugten Ausführungsform beispielhaft erläutert.The Invention will now be described with reference to the accompanying drawings a preferred embodiment exemplified.
Es zeigt:It shows:
Es
ist ein Brennstoffzellensystem
Die in der vorstehenden Beschreibung, in den Zeichnungen sowie in den Ansprüchen offenbarten Merkmale der Erfindung können sowohl einzeln als auch in beliebiger Kombination für die Verwirklichung der Erfindung wesentlich sein.The in the above description, in the drawings and in the claims disclosed features of the invention can both individually and also in any combination for the realization of the invention be essential.
- 1010
- HauptabgasstrangMain exhaust line
- 1212
- erste Abzweigleitungfirst branch line
- 1414
- zweite Abzweigleitungsecond branch line
- 1616
- Lambdasondelambda probe
- 1818
- Heizeinrichtungheater
- 2020
- Messvolumenmeasuring volume
- 2222
- Gehäusecasing
- 2424
- BrennstoffzellensystemThe fuel cell system
- 2626
- Abgasexhaust
- 2828
- Leitungmanagement
- 3030
- Leitungmanagement
- 3232
- Steuereinheitcontrol unit
- 3434
- TeilabgasstromPartial exhaust gas flow
Claims (5)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007020561A DE102007020561A1 (en) | 2007-05-02 | 2007-05-02 | Exhaust system and fuel cell system |
PCT/DE2008/000721 WO2008135016A1 (en) | 2007-05-02 | 2008-04-28 | Exhaust gas duct and fuel cell system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007020561A DE102007020561A1 (en) | 2007-05-02 | 2007-05-02 | Exhaust system and fuel cell system |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102007020561A1 true DE102007020561A1 (en) | 2008-11-06 |
Family
ID=39758815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102007020561A Withdrawn DE102007020561A1 (en) | 2007-05-02 | 2007-05-02 | Exhaust system and fuel cell system |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE102007020561A1 (en) |
WO (1) | WO2008135016A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004016568A1 (en) * | 2004-03-31 | 2005-10-27 | J. Dittrich Elektronic Gmbh & Co. Kg | Detecting residual gas in fuel gases for fuel cell, especially to detect oxygen as potential cause of explosion, using pump probe and fuel gas circuit with inlet for external atmosphere |
DE102004017883A1 (en) * | 2004-04-13 | 2005-11-10 | Audi Ag | Engine exhaust system comprises means for preventing condensed liquid from coming into contact with sensors in a catalyst housing, either in the form of storage areas or contact elements that heat up quickly |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3614535A1 (en) * | 1986-04-29 | 1987-11-05 | Comuna Metall Vorrichtungs U M | Internal combustion engine with exhaust emission control |
US4943493A (en) * | 1989-04-21 | 1990-07-24 | International Fuel Cells Corporation | Fuel cell power plant |
JPH0823409B2 (en) * | 1989-06-20 | 1996-03-06 | エミテツク ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング | Method and apparatus for heat generation by flameless combustion of fuel in a gas stream |
AT1571U1 (en) * | 1996-09-13 | 1997-07-25 | Avl Verbrennungskraft Messtech | ARRANGEMENT FOR SAMPLING |
EP0908721A1 (en) * | 1997-10-10 | 1999-04-14 | Heraeus Electro-Nite International N.V. | Method of determining exhaust gas temperature and the air/fuel ratio lambda and sensor arrangement for carrying out the method |
US6779339B1 (en) * | 2003-05-02 | 2004-08-24 | The United States Of America As Represented By The Environmental Protection Agency | Method for NOx adsorber desulfation in a multi-path exhaust system |
JP4466191B2 (en) * | 2003-06-23 | 2010-05-26 | 株式会社日立製作所 | Catalyst structure and fuel cell with catalyst |
DE102005051358A1 (en) * | 2005-10-25 | 2007-04-26 | Volkswagen Ag | Exhaust gas mass determining method for use in e.g. diesel engine, involves determining mass of exhaust gas in channel, from ratio of mass of pumped oxygen to difference of lambda values in channel before and after oxygen pumping |
-
2007
- 2007-05-02 DE DE102007020561A patent/DE102007020561A1/en not_active Withdrawn
-
2008
- 2008-04-28 WO PCT/DE2008/000721 patent/WO2008135016A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004016568A1 (en) * | 2004-03-31 | 2005-10-27 | J. Dittrich Elektronic Gmbh & Co. Kg | Detecting residual gas in fuel gases for fuel cell, especially to detect oxygen as potential cause of explosion, using pump probe and fuel gas circuit with inlet for external atmosphere |
DE102004017883A1 (en) * | 2004-04-13 | 2005-11-10 | Audi Ag | Engine exhaust system comprises means for preventing condensed liquid from coming into contact with sensors in a catalyst housing, either in the form of storage areas or contact elements that heat up quickly |
Also Published As
Publication number | Publication date |
---|---|
WO2008135016A1 (en) | 2008-11-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20121201 |