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WO2001079809A1 - Method for analysing measured gas - Google Patents

Method for analysing measured gas Download PDF

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Publication number
WO2001079809A1
WO2001079809A1 PCT/EP2001/004246 EP0104246W WO0179809A1 WO 2001079809 A1 WO2001079809 A1 WO 2001079809A1 EP 0104246 W EP0104246 W EP 0104246W WO 0179809 A1 WO0179809 A1 WO 0179809A1
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WO
WIPO (PCT)
Prior art keywords
analyzer
gas
measuring
distributor
measuring points
Prior art date
Application number
PCT/EP2001/004246
Other languages
German (de)
French (fr)
Inventor
Dieter Rebhan
Original Assignee
Linde Ag
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 Linde Ag filed Critical Linde Ag
Priority to AU2001263857A priority Critical patent/AU2001263857A1/en
Publication of WO2001079809A1 publication Critical patent/WO2001079809A1/en

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Classifications

    • 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
    • G01N33/0022—General constructional details of gas analysers, e.g. portable test equipment using a number of analysing channels
    • 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
    • G01N1/26—Devices for withdrawing samples in the gaseous state with provision for intake from several spaces

Definitions

  • the invention relates to a method for analyzing one of a plurality of gas streams which are detected at a plurality of measuring points, the gas stream to be analyzed being passed from the measuring point to an analyzer, and a device for analyzing one of a plurality of gas streams with a plurality of measuring points for each detection of a gas stream, in each case one measuring line from each of the measuring points to an analyzer and a P ⁇ mar pump to demand gas from the measuring points via the measuring lines to the analyzer
  • the atmospheric oxygen has a negative effect on the quality of the paint layer, since the oxygen reacts with the paint surface and slows down or even prevents the curing process.
  • the radiation curing is therefore usually carried out in an inert gas atmosphere, usually in an atmosphere of pure
  • the concentration of oxygen in the hardening zone should be kept in a range of approximately 200 to 1000 ppm
  • a single analyzer is used for several measuring points, whereby the individual measuring points are connected to the analyzer via measuring lines, some of which are several meters long.
  • the dead times when switching between two measuring points represent a major problem Oxygen concentration are determined at different measuring points, after the gas atmosphere at the first measuring point has been analyzed, the line between the first measuring point and the analyzer is closed and the line between the new measuring point and the analyzer is opened. Due to the long line between the measuring point and the analyzer, relatively long pumping times are required until a gas concentration representative of the new measuring point is established on the analyzer. A quick switch between different measuring points is therefore at the expense of the quality of the measurement result.
  • the object of the present invention is to develop a method and a device which make it possible to analyze a plurality of gas flows in succession, it being possible to switch quickly between the analyzes of the individual gas flows.
  • the device according to the invention is characterized in that a plurality of measuring points for detecting a gas flow, a measuring line from each of the measuring points to an analyzer and a primary pump for conveying gas from the measuring points via the measuring lines to the analyzer are provided, with each measuring line branches off a suction line, wherein all suction lines open into a manifold in which a secondary pump is provided, and that a valve is arranged in each suction line and in each measuring line downstream of the branch to the respective suction line.
  • a distributor is understood to be a device which allows each of the gas streams to either be directed to the analyzer or via a different line dissipate.
  • the distributor therefore has at least one branch for each measuring line.
  • the device according to the invention has a secondary pump, with which measuring gas is pumped to the distributor continuously and simultaneously from all measuring points which are examined with the aid of the analyzer.
  • the sample gas from the various measuring points is brought together in a manifold after the distributor and drawn off, generally conveyed to the outside as exhaust gas. If the gas atmosphere is to be analyzed at one of the measuring points, the gas stream coming from this measuring point is not passed on to the collecting line, but is led directly from the distributor to the analyzer. To switch to another measuring point, the previous gas flow to the analyzer is interrupted and instead led into the collecting line and the gas flow now to be analyzed is diverted from the distributor to the analyzer.
  • the analyzer is located in close proximity to the manifold, i.e. that the line lengths between the distributor and the analyzer are minimized and particularly preferably such that the flow paths between the distributor and the analyzer are the same for the gas streams obtained at the individual measuring points.
  • the distributor Since the distributor is constantly supplied with gas from all measuring points, the gas to be analyzed only has to be conveyed from the distributor to the analyzer and not from the respective measuring point to the analyzer. Even with several measuring points spaced far apart, which means that the analyzer cannot necessarily be arranged in the immediate vicinity of all measuring points, it is possible to keep the dead times when switching between different measuring points small.
  • the gas stream to be analyzed is conducted from the distributor to the analyzer. A part of this gas flow can also be drawn off with the remaining gas flows. However, the entire gas stream to be analyzed is preferably fed to the analyzer, since this improves the quality of the analysis.
  • a P ⁇ mar pump is preferably provided, which is arranged downstream or upstream of the analyzer. The P ⁇ mar pump is particularly preferably located downstream of the analyzer, since in this way the gas to be analyzed may be entrained by the P ⁇ mar pump Impurities do not adversely affect the analyzer
  • the single figure shows schematically a device for analyzing the gas atmosphere in a jet hardening system of a paint shop
  • the paints are irradiated with UV lamps 1a, 1 b, 1c, 1d, which initiates radical chain polymerization, which leads to curing of the paint.
  • UV lamps 1a, 1 b, 1c, 1d which initiates radical chain polymerization, which leads to curing of the paint.
  • the quality of paints hardened in this way is influenced by the presence of oxygen during the Hardening process severely impaired Therefore the hardening zone is mertertised with nitrogen gas and the oxygen concentration in the hardening zone is monitored
  • measuring points 2a, 2b, 2c, 2d are arranged in the immediate vicinity of each UV lamp 1a, 1b, 1c, d.
  • gas from the surroundings of the respective UV lamp 1a, 1b, 1c, 1d removed and fed via a measuring line 3a, 3b, 3c, 3d to a distributor 4.
  • the measuring lines 3a, 3b, 3c, 3d have different and sometimes considerable lengths depending on the arrangement of the measuring points 2a, 2b, 2c, 2d
  • the distributor 4 branch off from the measuring lines 3a, 3b, 3c, 3d suction lines 5a, 5b, 5c, 5d, which lead to a common collecting line 6, in which there is a secondary pump 7.
  • the collecting line 6 leads downstream of the
  • the flow connections between the measuring lines 3 and the collecting line 6 can be interrupted by valves 8a, 8b, 8c, 8d, which are provided in each of the suction lines 5
  • the measuring lines 3 are merged downstream of the branches of the suction lines 5 into a collecting line 9, in which a primary pump 10 and an oxygen analyzer 11 are arranged.
  • the primary pump 10 can be arranged both downstream and upstream of the analyzer 11, and in the case of sensitive measurements the primary pump is preferably provided downstream of the analyzer 11 in order to keep contaminants, such as traces of oil, that may escape from the pump 10 away from the analyzer.
  • the measuring lines 3 can be closed between the respective branches in the suction lines 5 and the connection to the collecting line 9 by means of the valves 12a, 12b, 12c, 12d.
  • the line lengths between the distributor 4 and the analyzer 11 are kept as short as possible.
  • valves 8 are first opened and the valves 12 are closed.
  • the secondary pump 7 sucks gas permanently from the measuring points 2 via the measuring lines 3, the suction lines 5 and the collecting line 6 and conveys the gas mixture forming in the collecting line 6 to the outside.
  • the distributor 4 located in the immediate vicinity of the analyzer 11 is constantly provided with measuring gas from all measuring points 2.
  • the valve 8a is closed and the connection to the secondary pump 7 is interrupted.
  • the valve 12a is opened simultaneously or with a slight time delay.
  • the analyzer 11 is supplied with the gas to be analyzed from the measuring point 1a in a short way.
  • valve 12a When switching to another measuring point, for example measuring point 1c, valve 12a is first closed and valve 8a opened. Due to the short line lengths between the distributor 4 and the analyzer 11, the gas in the line between the valve 12 a and the analyzer 11 is drawn off by the primary pump 10 in a very short time. The subsequent analysis is therefore not affected by the previous measurement. By closing the valve 8a, the gas supply from the measuring point 1a to the distributor 4 is maintained again by the secondary pump 7. The valves 8c are then closed and 12c opened, whereby the analyzer 11 is now supplied with gas from the measuring point 2c for analysis.
  • the control of the sample gas switchover is preferably carried out by the usually existing data processing system, for example a PLC control.

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Abstract

The invention relates to a method for analysing one of several gas streams which are read at several measuring points, whereby the gas stream to be analysed is fed from the measuring point to an analyser. All the gas streams from the measuring points (2a, b, c, d) are transported to a distributor (4) and only the gas stream to be analysed is forwarded from said distributor (4) to the analyser (11). The remaining gas streams are withdrawn from the distributor (4).

Description

Beschreibung description
Verfahren zur MeßgasanalyseSample gas analysis method
Die Erfindung betπfft ein Verfahren zur Analyse eines von mehreren Gasstromen, die an mehreren Meßstellen erfasst werden, wobei der zu analysierende Gasstrom von der Meßstelle zu einem Analysator geleitet wird sowie eine Vorrichtung zur Analyse eines von mehreren Gasstromen mit mehreren Meßstellen zur Erfassung jeweils eines Gasstromes, jeweils einer Meßleitung von jeder der Meßstellen zu einem Analysator sowie einer Pπmarpumpe zur Forderung von Gas von den Meßstellen über die Meßleitungen zu dem AnalysatorThe invention relates to a method for analyzing one of a plurality of gas streams which are detected at a plurality of measuring points, the gas stream to be analyzed being passed from the measuring point to an analyzer, and a device for analyzing one of a plurality of gas streams with a plurality of measuring points for each detection of a gas stream, in each case one measuring line from each of the measuring points to an analyzer and a Pπmar pump to demand gas from the measuring points via the measuring lines to the analyzer
Verschärfte Umweltbestimmungen haben dazu gefuhrt, daß industrielle Lackierbetriebe zunehmend auf den Einsatz von strahlenhartbaren Lacken übergehen Durch Bestrahlung mit schnellen Elektronen oder UV-Strahlen können speziell konzipierte Lacke ausgehartet werden, ohne daß fluchtige Losemittel benotigt werden oder sonstige umweltschadliche Emissionen auftretenStricter environmental regulations have led industrial paint shops to increasingly use radiation-hardenable paints. By irradiating with fast electrons or UV rays, specially designed paints can be cured without the need for volatile solvents or other environmentally harmful emissions
Bei der Strahlenhartung von Lacken wirkt sich jedoch der Luftsauerstoff auf die Qualität der Lackschicht negativ aus, da der Sauerstoff mit der Lackoberflache reagiert und den Ausharteprozeß bremst oder gar unterbindet Die Strahlenaushartung erfolgt daher in der Regel in einer Inertgasatmosphare, meist in einer Atmosphäre aus reinemWhen curing paints, however, the atmospheric oxygen has a negative effect on the quality of the paint layer, since the oxygen reacts with the paint surface and slows down or even prevents the curing process. The radiation curing is therefore usually carried out in an inert gas atmosphere, usually in an atmosphere of pure
Stickstoff Die Konzentration des Sauerstoffs in der Aushartungszone sollte dabei in einem Bereich von etwa 200 bis 1000 ppm gehalten werdenNitrogen The concentration of oxygen in the hardening zone should be kept in a range of approximately 200 to 1000 ppm
Zur Überwachung des Sauerstoffgehalts in den oft meterlangen Lackieranlagen sind mehrere voneinander beabstandete Meßstellen eingerichtet, an denen Gas abgezogen und zu einem Analysator gepumpt wird, in dem die Sauerstoffkonzentration an der jeweiligen Meßstelle bestimmt wird Bei zu hohen Sauerstoffkonzentrationen kann dann regelnd in den Prozeßablauf eingegriffen werdenTo monitor the oxygen content in the often meter-long paint shops, several measuring points are set up at which gas is drawn off and pumped to an analyzer, in which the oxygen concentration is determined at the respective measuring point. If the oxygen concentration is too high, the process can then be intervened to regulate
Meist wird aus Kostengrunden ein einziges Analysengerat für mehrere Meßstellen eingesetzt, wobei die einzelnen Meßstellen über teilweise meterlange Meßleitungen mit dem Analysator verbunden sind Hierbei stellen die Totzeiten beim Umschalten zwischen zwei Meßstellen ein großes Problem dar Soll nacheinander die Sauerstoffkonzentration an unterschiedlichen Meßstellen bestimmt werden, so wird, nachdem die Gasatmosphäre an der ersten Meßstelle analysiert worden ist, die Leitung zwischen der ersten Meßstelle und dem Analysator geschlossen und die Leitung zwischen der neuen Meßstelle und dem Analysator geöffnet. Aufgrund der langen Leitung zwischen der Meßstelle und dem Analysator sind relativ lange Pumpzeiten erforderlich, bis sich am Analysator eine für die neue Meßstelle repräsentative Gaskonzentration einstellt. Eine schnelle Umschaltung zwischen verschiedenen Meßstellen geht daher zu Lasten der Qualität des Meßergebnisses.Usually, for cost reasons, a single analyzer is used for several measuring points, whereby the individual measuring points are connected to the analyzer via measuring lines, some of which are several meters long. The dead times when switching between two measuring points represent a major problem Oxygen concentration are determined at different measuring points, after the gas atmosphere at the first measuring point has been analyzed, the line between the first measuring point and the analyzer is closed and the line between the new measuring point and the analyzer is opened. Due to the long line between the measuring point and the analyzer, relatively long pumping times are required until a gas concentration representative of the new measuring point is established on the analyzer. A quick switch between different measuring points is therefore at the expense of the quality of the measurement result.
Sind zur Überwachung des Prozeßablaufes kurze Meßintervalle erforderlich und müssen die Meßwerte zudem mit hoher Qualität vorliegen, so müssen bisher mehrere Analysatoren eingesetzt werden. Im Extremfall ist für jede Meßstelle sogar ein separater Analysator erforderlich.If short measuring intervals are required to monitor the process flow and the measured values must also be of high quality, several analyzers have to be used so far. In extreme cases, a separate analyzer is even required for each measuring point.
Aufgabe vorliegender Erfindung ist es, ein Verfahren und eine Vorrichtung zu entwickeln, die es erlauben, nacheinander mehrere Gasströme zu analysieren, wobei zwischen den Analysen der einzelnen Gasströme schnell umgeschaltet werden kann.The object of the present invention is to develop a method and a device which make it possible to analyze a plurality of gas flows in succession, it being possible to switch quickly between the analyzes of the individual gas flows.
Diese Aufgabe wird erfindungsgemäß durch ein Verfahren der eingangs genannten Art gelöst, bei dem die Gasströme von jeder der Meßstellen zu einem Verteiler gefördert werden, nur der zu analysierende Gasstrom von dem Verteiler zu dem Analysator geleitet wird und die übrigen Gasströme aus dem Verteiler abgezogen werden.This object is achieved according to the invention by a method of the type mentioned in the introduction, in which the gas streams are conveyed from each of the measuring points to a distributor, only the gas stream to be analyzed is passed from the distributor to the analyzer and the other gas streams are withdrawn from the distributor.
Die erfindungsgemäße Vorrichtung zeichnet sich dadurch aus, daß mehrere Meßstellen zur Erfassung jeweils eines Gasstromes, jeweils eine Meßleitung von jeder der Meßstellen zu einem Analysator sowie eine Primärpumpe zur Förderung von Gas von den Meßstellen über die Meßleitungen zu dem Analysator vorgesehen sind, wobei von jeder Meßleitung eine Ansaugleitung abzweigt, wobei alle Ansaugleitungen in eine Sammelleitung münden, in der eine Sekundärpumpe vorgesehen ist, und daß in jeder Ansaugleitung und in jeder Meßleitung stromabwärts der Abzweigung zur jeweiligen Ansaugleitung ein Ventil angeordnet ist.The device according to the invention is characterized in that a plurality of measuring points for detecting a gas flow, a measuring line from each of the measuring points to an analyzer and a primary pump for conveying gas from the measuring points via the measuring lines to the analyzer are provided, with each measuring line branches off a suction line, wherein all suction lines open into a manifold in which a secondary pump is provided, and that a valve is arranged in each suction line and in each measuring line downstream of the branch to the respective suction line.
Erfindungsgemäß werden alle Gasströme zunächst zu einem Verteiler geleitet. Unter einem Verteiler wird im folgenden eine Vorrichtung verstanden, die es erlaubt, jeden der Gasströme entweder zu dem Analysator zu leiten oder über eine andere Leitung abzuführen. Der Verteiler weist also für jede Meßleitung mindestens eine Abzweigung auf. Durch die Zwischenschaltung des Verteilers, der stets mit allen Gasströmen versorgt wird, wird das oben erläuterte Totzeitproblem gelöst.According to the invention, all gas streams are first routed to a distributor. In the following, a distributor is understood to be a device which allows each of the gas streams to either be directed to the analyzer or via a different line dissipate. The distributor therefore has at least one branch for each measuring line. The dead time problem explained above is solved by interposing the distributor, which is always supplied with all gas flows.
Die erfindungsgemäße Vorrichtung weist hierzu eine Sekundärpumpe auf, mit der ständig simultan von allen Meßstellen, die mit Hilfe des Analysators untersucht werden, Meßgas zu dem Verteiler gepumpt wird. Das Meßgas der verschiedenen Meßstellen wird nach dem Verteiler in eine Sammelleitung zusammengeführt und abgezogen, in der Regel als Abgas ins Freie gefördert. Soll die Gasatmosphäre an einer der Meßstellen analysiert werden, so wird der von dieser Meßstelle kommende Gasstrom nicht in die Sammelleitung weitergeleitet, sondern von dem Verteiler direkt zum Analysator geführt. Zum Umschalten auf eine andere Meßstelle wird der bisherige Gasstrom zum Analysator unterbrochen und stattdessen in die Sammelleitung geführt und der nunmehr zu analysierende Gasstrom vom Verteiler zum Analysator umgeleitet.For this purpose, the device according to the invention has a secondary pump, with which measuring gas is pumped to the distributor continuously and simultaneously from all measuring points which are examined with the aid of the analyzer. The sample gas from the various measuring points is brought together in a manifold after the distributor and drawn off, generally conveyed to the outside as exhaust gas. If the gas atmosphere is to be analyzed at one of the measuring points, the gas stream coming from this measuring point is not passed on to the collecting line, but is led directly from the distributor to the analyzer. To switch to another measuring point, the previous gas flow to the analyzer is interrupted and instead led into the collecting line and the gas flow now to be analyzed is diverted from the distributor to the analyzer.
Vorzugsweise ist der Analysator in unmittelbarer Nähe zu dem Verteiler angeordnet, d.h. daß die Leitungslängen zwischen dem Verteiler und dem Analysator minimiert werden und besonders bevorzugt so, daß die Strömungswege zwischen dem Verteiler und dem Analysator für die an den einzelnen Meßstellen gewonnenen Gasströme gleich sind.Preferably the analyzer is located in close proximity to the manifold, i.e. that the line lengths between the distributor and the analyzer are minimized and particularly preferably such that the flow paths between the distributor and the analyzer are the same for the gas streams obtained at the individual measuring points.
Da der Verteiler ständig mit Gas von allen Meßstellen versorgt wird, muß das zu analysierende Gas nur vom Verteiler zum Analysator und nicht von der jeweiligen Meßstelle zum Analysator gefördert werden. Auch bei mehreren weit voneinander beabstandeten Meßstellen, wodurch der Analysator zwangsläufig nicht in unmittelbarer Nähe aller Meßstellen angeordnet werden kann, ist es so möglich, die Totzeiten beim Umschalten zwischen verschiedenen Meßstellen klein zu halten.Since the distributor is constantly supplied with gas from all measuring points, the gas to be analyzed only has to be conveyed from the distributor to the analyzer and not from the respective measuring point to the analyzer. Even with several measuring points spaced far apart, which means that the analyzer cannot necessarily be arranged in the immediate vicinity of all measuring points, it is possible to keep the dead times when switching between different measuring points small.
Der zu analysierende Gasstrom wird erfindungsgemäß von dem Verteiler zu dem Analysator geleitet. Ein Teil dieses Gasstroms kann aber auch mit den restlichen Gasströmen abgezogen werden. Vorzugsweise wird jedoch der gesamte zu analysierende Gasstrom dem Analysator zugeführt, da dadurch die Qualität der Analyse verbessert wird. Zur Forderung des zu analysierenden Gases von dem Verteiler zu dem Analysator ist vorzugsweise eine Pπmarpumpe vorgesehen, die stromabwärts oder stromaufwärts des Analysators angeordnet ist Besonders bevorzugt befindet sich die Pπmarpumpe stromabwärts des Analysators, da auf diese Weise eventuell von dem zu analysierenden Gas aus der Pπmarpumpe mitgerissene Verunreinigungen den Analysator nicht negativ beeinflussenAccording to the invention, the gas stream to be analyzed is conducted from the distributor to the analyzer. A part of this gas flow can also be drawn off with the remaining gas flows. However, the entire gas stream to be analyzed is preferably fed to the analyzer, since this improves the quality of the analysis. To request the gas to be analyzed from the distributor to the analyzer, a Pπmar pump is preferably provided, which is arranged downstream or upstream of the analyzer. The Pπmar pump is particularly preferably located downstream of the analyzer, since in this way the gas to be analyzed may be entrained by the Pπmar pump Impurities do not adversely affect the analyzer
Die Erfindung sowie weitere Einzelheiten der Erfindung werden im folgenden anhand von dem in der Zeichnung dargestellten Ausfuhrungsbeispiel naher erläutertThe invention and further details of the invention are explained in more detail below with reference to the exemplary embodiment shown in the drawing
Hierbei zeigt die einzige Figur schematisch eine Vorrichtung zur Analyse der Gasatmosphare in einer Strahlhartungsanlage einer LackierereiHere, the single figure shows schematically a device for analyzing the gas atmosphere in a jet hardening system of a paint shop
Bei der Strahlenhartung von Lacken werden die Lacke mit UV-Strahlern 1a, 1 b, 1c, 1d bestrahlt, wodurch eine Radikalkettenpolymensation in Gang gesetzt wird, die zu einer Aushärtung des Lackes fuhrt Die Qualität so ausgehärteter Lacke wird durch die Anwesenheit von Sauerstoff wahrend des Aushartungsprozesses stark beeinträchtigt Daher wird die Aushartungszone mit Stickstoffgas mertisiert und die Sauerstoffkonzentration in der Aushartungszone überwachtDuring the radiation curing of paints, the paints are irradiated with UV lamps 1a, 1 b, 1c, 1d, which initiates radical chain polymerization, which leads to curing of the paint. The quality of paints hardened in this way is influenced by the presence of oxygen during the Hardening process severely impaired Therefore the hardening zone is mertertised with nitrogen gas and the oxygen concentration in the hardening zone is monitored
Hierzu sind in unmittelbarer Nahe jedes UV-Strahlers 1a, 1 b, 1c, d Meßstellen 2a, 2b, 2c, 2d angeordnet An jeder Meßstelle 2a, 2b, 2c, 2d wird Gas aus der Umgebung des jeweiligen UV-Strahlers 1a, 1b, 1c, 1d abgezogen und über Meßleitungen 3a, 3b, 3c, 3d einem Verteiler 4 zugeführt In dem Bereich 13 besitzen die Meßleitungen 3a, 3b, 3c, 3d je nach Anordnung der Meßstellen 2a, 2b, 2c, 2d unterschiedliche und teilweise beträchtliche LangeFor this purpose, measuring points 2a, 2b, 2c, 2d are arranged in the immediate vicinity of each UV lamp 1a, 1b, 1c, d. At each measuring point 2a, 2b, 2c, 2d, gas from the surroundings of the respective UV lamp 1a, 1b, 1c, 1d removed and fed via a measuring line 3a, 3b, 3c, 3d to a distributor 4. In the area 13 the measuring lines 3a, 3b, 3c, 3d have different and sometimes considerable lengths depending on the arrangement of the measuring points 2a, 2b, 2c, 2d
In dem Verteiler 4 zweigen von den Meßleitungen 3a, 3b, 3c, 3d Ansaugleitungen 5a, 5b, 5c, 5d ab, die zu einer gemeinsamen Sammelleitung 6 fuhren, in der sich eine Sekundarpumpe 7 befindet Die Sammelleitung 6 fuhrt stromabwärts derIn the distributor 4 branch off from the measuring lines 3a, 3b, 3c, 3d suction lines 5a, 5b, 5c, 5d, which lead to a common collecting line 6, in which there is a secondary pump 7. The collecting line 6 leads downstream of the
Sekundarpumpe 7 ins Freie Die Stromungsverbindungen zwischen den Meßleitungen 3 und der Sammelleitung 6 können durch Ventile 8a, 8b, 8c, 8d, die in jeder der Ansaugleitungen 5 vorgesehen sind, unterbrochen werden Die Meßleitungen 3 werden stromabwärts der Abzeigungsstelien der Ansaugleitungen 5 in eine Sammelleitung 9 zusammengeführt, in der eine Primäφumpe 10 und ein Sauerstoffanalysator 11 angeordnet sind. Die Primärpumpe 10 kann sowohl stromabwärts als auch stromaufwärts des Analysators 11 angeordnet sein, wobei bei empfindlichen Messungen die Primäφumpe bevorzugt stromabwärts des Analysators 11 vorgesehen wird, um eventuell aus der Pumpe 10 austretende Verunreinigungen, wie Spuren von Öl, von dem Analysator fernzuhalten.Secondary pump 7 to the outside The flow connections between the measuring lines 3 and the collecting line 6 can be interrupted by valves 8a, 8b, 8c, 8d, which are provided in each of the suction lines 5 The measuring lines 3 are merged downstream of the branches of the suction lines 5 into a collecting line 9, in which a primary pump 10 and an oxygen analyzer 11 are arranged. The primary pump 10 can be arranged both downstream and upstream of the analyzer 11, and in the case of sensitive measurements the primary pump is preferably provided downstream of the analyzer 11 in order to keep contaminants, such as traces of oil, that may escape from the pump 10 away from the analyzer.
Die Meßleitungen 3 sind zwischen den jeweiligen Verzweigungen in die Ansaugleitungen 5 und dem Anschluß an die Sammelleitung 9 mittels der Ventile 12a, 12b, 12c, 12d verschließbar. Die Leitungslängen zwischen dem Verteiler 4 und dem Analysator 11 werden so gering wie möglich gehalten.The measuring lines 3 can be closed between the respective branches in the suction lines 5 and the connection to the collecting line 9 by means of the valves 12a, 12b, 12c, 12d. The line lengths between the distributor 4 and the analyzer 11 are kept as short as possible.
Im Betrieb werden zunächst die Ventile 8 geöffnet und die Ventile 12 geschlossen. Die Sekundärpumpe 7 saugt permanent Gas von den Meßstellen 2 über die Meßleitungen 3, die Ansaugleitungen 5 und die Sammelleitung 6 an und fördert das sich in der Sammelleitung 6 bildende Gasgemisch ins Freie. Auf diese Weise wird dem in unmittelbarer Nähe des Analysators 11 befindlichen Verteiler 4 ständig Meßgas von allen Meßstellen 2 zur Verfügung gestellt.In operation, the valves 8 are first opened and the valves 12 are closed. The secondary pump 7 sucks gas permanently from the measuring points 2 via the measuring lines 3, the suction lines 5 and the collecting line 6 and conveys the gas mixture forming in the collecting line 6 to the outside. In this way, the distributor 4 located in the immediate vicinity of the analyzer 11 is constantly provided with measuring gas from all measuring points 2.
Soll die Sauerstoffkonzentration in der Umgebung des Strahlers 1a gemessen werden, so wird das Ventil 8a geschlossen und so die Verbindung zur Sekundäφumpe 7 unterbrochen. Gleichzeitig oder mit geringer Zeitverzögerung wird das Ventil 12a geöffnet. Mittels der Primärpumpe 10 wird so dem Analysator 11 auf kurzem Weg das zu analysierende Gas von der Meßstelle 1a zugeführt.If the oxygen concentration in the vicinity of the radiator 1a is to be measured, the valve 8a is closed and the connection to the secondary pump 7 is interrupted. The valve 12a is opened simultaneously or with a slight time delay. By means of the primary pump 10, the analyzer 11 is supplied with the gas to be analyzed from the measuring point 1a in a short way.
Beim Umschalten auf eine andere Meßstelle, beispielsweise die Meßstelle 1c, wird zunächst das Ventil 12a geschlossen und das Ventil 8a geöffnet. Aufgrund der kurzen Leitungslängen zwischen dem Verteiler 4 und dem Analysator 11 wird das Gas in der Leitung zwischen dem Ventil 12a und dem Analysator 11 in kürzester Zeit durch die Primärpumpe 10 abgezogen. Die nachfolgende Analyse wird somit durch die vorhergehende Messung nicht beeinflusst. Durch die Schließung des Ventils 8a wird der Gasnachschub von der Meßstelle 1a zu dem Verteiler 4 wieder durch die Sekundärpumpe 7 aufrecht erhalten. Anschließend werden die Ventile 8c geschlossen und 12c geöffnet, wodurch dem Analysator 11 nunmehr Gas von der Meßstelle 2c zur Analyse zugeführt wird.When switching to another measuring point, for example measuring point 1c, valve 12a is first closed and valve 8a opened. Due to the short line lengths between the distributor 4 and the analyzer 11, the gas in the line between the valve 12 a and the analyzer 11 is drawn off by the primary pump 10 in a very short time. The subsequent analysis is therefore not affected by the previous measurement. By closing the valve 8a, the gas supply from the measuring point 1a to the distributor 4 is maintained again by the secondary pump 7. The valves 8c are then closed and 12c opened, whereby the analyzer 11 is now supplied with gas from the measuring point 2c for analysis.
Aufgrund der kurzen Strömungswege zwischen dem Verteiler 4, in dem ständig Gas von jeder der Meßstellen 2 bereit gehalten wird, und dem Analysator 11 ist ein sehr schnelles Umschalten zwischen verschiedenen Meßstellen 2a, b, c, d möglich, ohne daß eine Analyse durch die vorhergehende Analyse beeinflusst wird. Die Steuerung der Meßgasumschaltung wird vorzugsweise durch die üblicherweise vorhandene Datenverarbeitungsanlage, beispielsweise eine SPS-Steuerung, übernommen. Due to the short flow paths between the distributor 4, in which gas is constantly kept ready by each of the measuring points 2, and the analyzer 11, a very quick switching between different measuring points 2a, b, c, d is possible without an analysis by the previous one Analysis is influenced. The control of the sample gas switchover is preferably carried out by the usually existing data processing system, for example a PLC control.

Claims

Patentansprüche claims
1. Verfahren zur Analyse eines von mehreren Gasströmen, die an mehreren Meßstellen erfasst werden, wobei der zu analysierende Gasstrom von der Meßstelle zu einem Analysator geleitet wird, dadurch gekennzeichnet, daß die Gasströme von jeder der Meßstellen (2a, b, c, d) zu einem Verteiler (4) gefördert werden, nur der zu analysierende Gasstrom von dem Verteiler (4) zu dem Analysator (11) geleitet wird und die übrigen Gasströme aus dem Verteiler (4) abgezogen werden.1. A method for analyzing one of a plurality of gas flows which are detected at a plurality of measuring points, the gas flow to be analyzed being passed from the measuring point to an analyzer, characterized in that the gas flows from each of the measuring points (2a, b, c, d) are conveyed to a distributor (4), only the gas stream to be analyzed is conducted from the distributor (4) to the analyzer (11) and the remaining gas streams are withdrawn from the distributor (4).
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß der Analysator (11) in unmittelbarer Nähe zu dem Verteiler (4) angeordnet ist.2. The method according to claim 1, characterized in that the analyzer (11) is arranged in close proximity to the distributor (4).
3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der zu analysierende Gasstrom nur zu dem Analysator (11) geleitet wird.3. The method according to any one of claims 1 or 2, characterized in that the gas stream to be analyzed is passed only to the analyzer (11).
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Sauerstoffgehalt des zu analysierende Gasstroms mit dem Analysator (11) gemessen wird.4. The method according to any one of claims 1 to 3, characterized in that the oxygen content of the gas stream to be analyzed is measured with the analyzer (11).
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß der Sauerstoffgehalt in der Prozeßatmosphäre beim Strahlhärten von Lacken gemessen wird.5. The method according to claim 4, characterized in that the oxygen content in the process atmosphere is measured during the jet hardening of paints.
6. Vorrichtung zur Analyse eines von mehreren Gasströmen mit mehreren6. Device for analyzing one of several gas streams with several
Meßstellen zur Erfassung jeweils eines Gasstromes, jeweils einer Meßleitung von jeder der Meßstellen zu einem Analysator sowie einer Primärpumpe zur Förderung von Gas von den Meßstellen über die Meßleitungen zu dem Analysator, dadurch gekennzeichnet, daß von jeder Meßleitung (3a, b, c, d) eine Ansaugleitung (5a, b, c, d) abzweigt, wobei alle Ansaugleitungen (5a, b, c, d) in eine Sammelleitung (6) münden, in der eine Sekundäφumpe (7) vorgesehen ist, und daß in jeder Ansaugleitung (5a, b, c, d) und in jeder Meßleitung (3a, b, c, d) stromabwärts derMeasuring points for detecting a gas flow, a measuring line from each of the measuring points to an analyzer and a primary pump for conveying gas from the measuring points via the measuring lines to the analyzer, characterized in that each measuring line (3a, b, c, d) a suction line (5a, b, c, d) branches off, all the suction lines (5a, b, c, d) opening into a manifold (6) in which a secondary pump (7) is provided, and that in each suction line (5a , b, c, d) and in each measuring line (3a, b, c, d) downstream of the
Abzweigung zur jeweiligen Ansaugleitung (5a, b, c, d) ein Ventil (8a, b, c, d, 12a, b, c, d) angeordnet ist. Branch to the respective suction line (5a, b, c, d) a valve (8a, b, c, d, 12a, b, c, d) is arranged.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Primärpumpe (10) stromabwärts des Analysators (11) angeordnet ist.7. The device according to claim 6, characterized in that the primary pump (10) is arranged downstream of the analyzer (11).
8. Vorrichtung nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß die Primärpumpe (10) stromaufwärts des Analysators (11) angeordnet ist.8. Device according to one of claims 6 or 7, characterized in that the primary pump (10) is arranged upstream of the analyzer (11).
9. Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß ein Analysator (11) zur Bestimmung der Konzentration einer Komponente des Gases, insbesondere ein Sauerstoffanalysator, vorgesehen ist. 9. Device according to one of claims 6 to 8, characterized in that an analyzer (11) for determining the concentration of a component of the gas, in particular an oxygen analyzer, is provided.
PCT/EP2001/004246 2000-04-17 2001-04-12 Method for analysing measured gas WO2001079809A1 (en)

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DE2000118991 DE10018991A1 (en) 2000-04-17 2000-04-17 Analysis of multiple gas flows at several measuring points, e.g. for varnish drying process, by supplying only gas to be analysed from distributor to analyser
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CN105675820A (en) * 2016-02-04 2016-06-15 大唐环境产业集团股份有限公司 Flue gas composition measurement method and system
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