WO2017125548A1 - Dispositif de prélèvement de gaz à mesurer - Google Patents

Dispositif de prélèvement de gaz à mesurer Download PDF

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Publication number
WO2017125548A1
WO2017125548A1 PCT/EP2017/051186 EP2017051186W WO2017125548A1 WO 2017125548 A1 WO2017125548 A1 WO 2017125548A1 EP 2017051186 W EP2017051186 W EP 2017051186W WO 2017125548 A1 WO2017125548 A1 WO 2017125548A1
Authority
WO
WIPO (PCT)
Prior art keywords
expansion volume
sample gas
pump
gas line
pressure
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.)
Ceased
Application number
PCT/EP2017/051186
Other languages
German (de)
English (en)
Inventor
Herbert REINGRUBER
Alexander Bergmann
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.)
AVL List GmbH
Original Assignee
AVL List GmbH
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 AVL List GmbH filed Critical AVL List GmbH
Publication of WO2017125548A1 publication Critical patent/WO2017125548A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2247—Sampling from a flowing stream of gas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2247—Sampling from a flowing stream of gas
    • G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0011—Sample conditioning
    • G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature

Definitions

  • the present invention relates to a method and a device for analyzing measurement gas, in particular exhaust gas of an internal combustion engine, which is subject to pressure and particle concentration changes.
  • at least one sample gas line is provided for guiding the sample gas
  • at least one analysis unit connected to the sample gas line is provided for determining at least one property of the sample gas.
  • evaluators e.g. Particle measuring devices used by which e.g. the number, size, mass of particles in the exhaust gas of an internal combustion engine are to be evaluated or analyzed.
  • Such analyzes are required, for example, in the course of regular testing of internal combustion engines in use, for example in the context of the periodic inspection of motor vehicles.
  • appropriate exhaust gas analyzes also take high priority in the development of internal combustion engines.
  • such analyzes are also carried out in connection with chimneys, flues and various incinerators.
  • a corresponding structure is shown for example in EP 0 967 481 A2, wherein the exhaust gas to be analyzed is conveyed through an analyzer by means of a constantly running vacuum pump.
  • a pressure regulator is provided in the line system, via which the exhaust gas is fed to the analyzer, which regulates the supply by the supply of incorrect air performs.
  • measuring and analyzing devices operate at a much lower pressure level.
  • appropriate panels are used.
  • dynamic processes such as pressure fluctuations, being distorted accordingly.
  • the reduced blast pressure level is often still too high to ensure optimal functioning of the analyzers used.
  • Object of the present invention is to allow the most representative possible removal of analysis gas.
  • an expansion volume in the form of a chamber-like widening of the sample gas line is provided in the sample gas line.
  • the measurement gas can be fed to the at least one analysis unit.
  • a pump is connected to the expansion volume, by means of which an at least approximately constant pressure level is maintained in the expansion volume.
  • at least one pressure sensor is provided, which is connected to a control unit. To regulate the pump, depending on the pressure level determined by the pressure sensor, the control unit is connected to the pump.
  • An expansion volume in the present disclosure is understood to mean an area with a cross-section or a cross-sectional area which is enlarged in relation to the sample gas line before or after the expansion volume, in particular upstream of the said area.
  • the cross-section or the cross-sectional area of the expansion volume is twice as large as the cross section of the sample gas line.
  • a smaller cross-section of the expansion volume can also be favorable.
  • the use of an expansion volume allows simultaneous mixing of the sample gas while reducing pressure, thereby reducing or avoiding inhomogeneities.
  • the pressure level is determined directly in the expansion volume and depending on that Controlling the pump, which ensures a constant pressure level, results in a compact control loop, by means of which the best possible response to dynamic pressure fluctuations can be achieved.
  • this realization is advantageous.
  • it is also an application with much smaller and less dynamic fluctuations in pressure possible, for example, in chimneys, boilers or heating plants.
  • heating of the expansion volume can also be provided. This can be a condensation of the sample gas can be prevented, which can occur, for example, by cooling the sample gas in the expansion in the expansion volume.
  • the heating can take place in various ways, for example heating coils on the outside or inside of the expansion volume or arrangement of the expansion volume within a heated, closed area.
  • At least one further pressure sensor is provided for determining the pressure level at a removal point at which the measurement gas is supplied to the sample gas line, and that the further pressure sensor is connected to the control unit.
  • the control unit thus two pressure values, those at the sampling point and that in the expansion volume from which the sample gas is fed to the analysis unit, provided. In this way it is possible to react even better to already mentioned pressure fluctuations. The maintenance of a constant pressure level in the expansion volume is thus further facilitated.
  • the sample gas line flows through the measurement gas in a flow direction and the pump is arranged in the flow direction according to the expansion volume. Negative influences on the sample gas, which can result from the pump, are prevented in this way.
  • an aperture for reducing the pressure is provided in the measuring gas line in front of the expansion volume.
  • the diaphragm is understood essentially to be an arbitrarily designed cross-sectional constriction. Such a cross-sectional constriction can be both tapered and made jumpy. In this way, the pressure is "pre-reduced” even before the expansion volume, which allows the expansion volume to be dimensioned primarily so that the distribution of particles that is as homogeneous as possible is achieved.
  • the necessary pressure reduction which is another task of the expansion volume, can be achieved in coordination with the upstream diaphragm and thus has no predominant influence on the dimensioning of the expansion volume.
  • the ratio between the inner diameter of the sample gas line and the smallest cross section of the diaphragm can be in the range of 1: 2 to 1: 100, depending on the desired dynamic range.
  • the pump is designed as a Venturi pump in combination with a control valve. In this way, the number of moving parts is reduced to a minimum. Possible impurities are less of a problem than, for example, pumps with rotating components. Also with regard to possible formation of condensate and associated potential damage, the Venturi pump is a much more robust device compared to conventional pump systems.
  • the invention also relates to a corresponding method for the analysis of measurement gas, in particular of exhaust gas of an internal combustion engine, wherein the measurement gas for determining at least one property is passed through a sample gas line to an associated analysis unit.
  • the sample gas is supplied to an expansion volume in the form of a chamber-like extension of the sample gas line, that the sample gas can be removed from the expansion volume and fed to the at least one analysis unit.
  • an at least approximately constant pressure level is maintained in the expansion volume by means of a pump connected to the expansion volume, wherein the pressure level in the expansion volume is determined by means of at least one pressure sensor connected to a control unit, and the pump is controlled by the control unit as a function of the pressure sensor Pressure levels, is regulated.
  • FIG. 1 shows the device according to the invention for the analysis of sample gas
  • FIG 2 shows the device according to the invention in an advantageous embodiment.
  • Figure 1 shows a schematic representation of the device 1 according to the invention for the analysis of sample gas.
  • the illustrated device 1 can, of course, be used in the analysis of a wide variety of gases or exhaust gases and, for example, in connection with chimneys and flues of different incinerators be used.
  • At least one sample gas line 2 is provided for guiding the sample gas and at least one analysis unit 3 connected to the sample gas line 2 is provided for determining at least one property of the sample gas.
  • an expansion volume 4 in the form of a chamber-shaped widening of the sample gas line 2 is provided in the sample gas line 2.
  • at least part of the measurement gas is supplied to the at least one analysis unit 3 from this expansion volume 4.
  • a pump 5 is connected to the expansion volume 4, by means of which in the expansion volume 4, an at least approximately constant pressure level is maintained.
  • This is preferably a, with respect to the ambient pressure to a slight negative pressure, for example in the range of about -10 to -30 mbar.
  • this pressure level is merely exemplary and may differ, depending on the field of application and the resulting requirements, from the value just given.
  • at least one pressure sensor 6, which is connected to a control unit 7, is provided in the expansion volume 4.
  • the control unit 7 is connected to the pump 5.
  • the measurement gas for determining at least one property is guided through the sample gas line 2 to the analysis unit 3 connected thereto.
  • the sample gas is the expansion volume 4, which is formed by a chamber-shaped extension of the sample gas line 2, respectively.
  • the sample gas can then be removed from the expansion volume and fed to the at least one analysis unit 3.
  • the pump 5 connected to the expansion volume 4 an at least approximately constant pressure level is maintained in the expansion volume 4, the pressure level in the expansion volume 4 being determined by means of at least one pressure sensor 6 connected to a control unit 7.
  • the pump 5 is controlled by means of this control unit 7, as a function of the pressure level determined by the pressure sensor 6.
  • the measurement gas is examined, for example, for chemical composition, size of the particles contained, particle concentration, etc.
  • this list is only to be regarded as an example because, depending on the field of application, the most varied measured variables or their measured values can be of interest. Even- In this case, a plurality of analysis units 3 may be provided for the determination of the respective measured variables or their measured values.
  • the use of the expansion volume 4 allows a simultaneous mixing of the sample gas, while reducing pressure, whereby inhomogeneities are reduced or avoided.
  • the sample gas supplied for analysis thus represents a sample, representative of the exhaust gas of an internal combustion engine, in terms of particle distribution. Since the pressure level is determined directly in the expansion volume 4 by means of the pressure sensor 6 is and depending on which pump 5 is controlled, which contributes to a constant pressure level care, resulting in a compact control loop by means of which can be responded to dynamic pressure fluctuations in the best possible way. As can further be seen in FIG. 1, that portion of the sample gas which was not supplied to the analysis unit 3 can be released to the environment via a delivery point 20 of the pump 5, for example via a downstream filter system.
  • FIG. 2 shows an advantageous embodiment of the device 1. It is provided that at least one further pressure sensor 9 is provided for determining the pressure level at the removal point 10 at which the measurement gas is supplied to the sample gas line 2 and that the further pressure sensor 9 is connected to the control unit 7.
  • the control unit 7 Since the pressure level at the removal point 10, at which the measurement gas is supplied to the measurement gas line 2, is thus determined by means of the further pressure sensor 9, which is connected to the control unit 7, the control unit 7 is thus provided with two pressure values.
  • Such a further pressure sensor 9 upstream of the pressure sensor 6 allows the control unit to respond even better to pressure fluctuations at the sampling point. stop 10 to respond. The maintenance of a constant pressure level in the expansion volume 4 is thus further facilitated.
  • an aperture 12 may be advantageous for an aperture 12 to reduce pressure to be provided in the measuring gas line 2 in the direction of flow 1 1 in front of the expansion volume 4.
  • the diaphragm 12 used which of course can also be formed by the juxtaposition of a plurality of diaphragms 12, serves primarily to "pre-reduce" the pressure level, which is to be understood as meaning that the pressure which is present at the extraction point 10 is not completely through the diaphragm 12 the pressure level which, as mentioned above, enables an optimal measurement or analysis in the analysis unit 3.
  • the pump 5 may advantageously be designed as a Venturi pump in combination with a control valve 51.
  • a control valve 51 In this way, the number of moving parts is reduced to a minimum. Possible impurities, such as the aforementioned soot particulate build-up, present a lesser problem than with corresponding pump systems, for example, with rotating components. Also with regard to possible formation of con- Densat and related possible damage, the Venturi pump is a much more robust device compared to conventional pump systems.
  • the mentioned control valve 51 which is only schematically indicated in Figure 2, may be formed for example by a needle valve, wherein, depending on the volume flow and other requirements, of course, other suitable valves can be used. It is also conceivable that the control valve 51 is integrated in the control unit 7.
  • the described device 1 for the analysis of sample gas allows, in particular in the case of fast and strong or highly dynamic pressure fluctuations or changing particle concentrations, to permit the most representative possible removal of analysis gas. In this way, the reliability of measurement results, in particular in the analysis of exhaust gas of an internal combustion engine is significantly improved.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Combustion & Propulsion (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

La présente invention concerne un dispositif (1) d'analyse de gaz à mesurer et un procédé de fonctionnement associé, en particulier pour l'analyse de gaz d'échappement d'un moteur à combustion interne qui subit des variations de concentration de particules et de pression, ledit dispositif (1) comprenant au moins une conduite de gaz à mesurer (2) destinée à guider le gaz à mesurer, et au moins une unité d'analyse (3) reliée à la conduite de gaz à mesurer, destinée à déterminer au moins une caractéristique du gaz à mesurer. Un volume d'expansion (4) sous la forme d'un élargissement en forme de chambre de la conduite de gaz à mesurer (2) est situé dans la conduite de gaz à mesurer (2), à partir duquel au moins une partie du gaz à mesurer peut être acheminée jusqu'à ladite au moins une unité d'analyse (3), une pompe (5) étant reliée au volume d'expansion (4), et permettant de maintenir un niveau de pression au moins approximativement constant dans le volume d'expansion (4), et au moins un capteur de pression (6) étant disposé dans le volume d'expansion (4), lequel capteur de pression est relié à une unité de régulation (7). Cette dernière est reliée à la pompe (5) pour la régulation de la pompe (5) en fonction du niveau de pression déterminé par le capteur de pression (6).
PCT/EP2017/051186 2016-01-21 2017-01-20 Dispositif de prélèvement de gaz à mesurer Ceased WO2017125548A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50029/2016A AT518184B1 (de) 2016-01-21 2016-01-21 Messgas Entnahmeeinrichtung
ATA50029/2016 2016-01-21

Publications (1)

Publication Number Publication Date
WO2017125548A1 true WO2017125548A1 (fr) 2017-07-27

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PCT/EP2017/051186 Ceased WO2017125548A1 (fr) 2016-01-21 2017-01-20 Dispositif de prélèvement de gaz à mesurer

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AT (1) AT518184B1 (fr)
WO (1) WO2017125548A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT522776A1 (de) * 2019-11-29 2021-01-15 Avl List Gmbh Verfahren zum Testen der Funktionalität von Hilfsaggregaten in einem Abgasanalysesystem
FR3127814A1 (fr) * 2021-10-01 2023-04-07 Envea Instrument de mesure equipe d’un detecteur a ionisation de flamme

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2357712A1 (de) * 1972-12-05 1974-06-06 Ford Werke Ag Bestimmungsgeraet fuer die gasanteile der emissionen einer mit kraftstoff betriebenen maschine
EP0312458A2 (fr) * 1987-10-13 1989-04-19 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Méthode pour réduire la pression d'un gaz très comprimé sans engendrer de condensation
EP0967481A2 (fr) * 1998-06-27 1999-12-29 Pierburg Aktiengesellschaft Appareil et méthode de mesure des composants d'un gaz d'échappement
KR20040095087A (ko) * 2003-05-06 2004-11-12 학교법인대우학원 시료가스 고속 샘플링장치
DE202012009711U1 (de) * 2012-10-04 2012-11-15 Helmholtz-Zentrum Für Umweltforschung Gmbh - Ufz Vorrichtung zur qualitativen und quantitativen Analyse der Komponenten eines Gases
DE102013218930A1 (de) * 2013-09-20 2015-04-16 Lubrisense Gmbh Mehrfach-Ölemissionsmessgerät für Motoren

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5110747A (en) * 1990-11-13 1992-05-05 Rupprecht & Patashnick Company, Inc. Diesel particulate monitor
US6138499A (en) * 1998-08-27 2000-10-31 Sun Electric Europe B.V. Exhaust emission analysis system incorporating pulse dampening
FR2938916B1 (fr) * 2008-11-24 2012-10-19 Ap2E Dispositif d'echantillonnage de gaz.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2357712A1 (de) * 1972-12-05 1974-06-06 Ford Werke Ag Bestimmungsgeraet fuer die gasanteile der emissionen einer mit kraftstoff betriebenen maschine
EP0312458A2 (fr) * 1987-10-13 1989-04-19 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Méthode pour réduire la pression d'un gaz très comprimé sans engendrer de condensation
EP0967481A2 (fr) * 1998-06-27 1999-12-29 Pierburg Aktiengesellschaft Appareil et méthode de mesure des composants d'un gaz d'échappement
KR20040095087A (ko) * 2003-05-06 2004-11-12 학교법인대우학원 시료가스 고속 샘플링장치
DE202012009711U1 (de) * 2012-10-04 2012-11-15 Helmholtz-Zentrum Für Umweltforschung Gmbh - Ufz Vorrichtung zur qualitativen und quantitativen Analyse der Komponenten eines Gases
DE102013218930A1 (de) * 2013-09-20 2015-04-16 Lubrisense Gmbh Mehrfach-Ölemissionsmessgerät für Motoren

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT522776A1 (de) * 2019-11-29 2021-01-15 Avl List Gmbh Verfahren zum Testen der Funktionalität von Hilfsaggregaten in einem Abgasanalysesystem
AT522776B1 (de) * 2019-11-29 2023-02-15 Avl List Gmbh Verfahren zum Testen der Funktionalität von Hilfsaggregaten in einem Abgasanalysesystem
FR3127814A1 (fr) * 2021-10-01 2023-04-07 Envea Instrument de mesure equipe d’un detecteur a ionisation de flamme

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Publication number Publication date
AT518184B1 (de) 2017-08-15
AT518184A4 (de) 2017-08-15

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