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WO2009112199A1 - Dispositif de mesure et montage de mesure pour déterminer la teneur de l'eau fraîche ou d'une eau résiduaire en un élément chimique ou en un autre paramètre de qualité de l'eau - Google Patents

Dispositif de mesure et montage de mesure pour déterminer la teneur de l'eau fraîche ou d'une eau résiduaire en un élément chimique ou en un autre paramètre de qualité de l'eau Download PDF

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Publication number
WO2009112199A1
WO2009112199A1 PCT/EP2009/001577 EP2009001577W WO2009112199A1 WO 2009112199 A1 WO2009112199 A1 WO 2009112199A1 EP 2009001577 W EP2009001577 W EP 2009001577W WO 2009112199 A1 WO2009112199 A1 WO 2009112199A1
Authority
WO
WIPO (PCT)
Prior art keywords
carrier gas
oxygen
controlled
valve
air
Prior art date
Application number
PCT/EP2009/001577
Other languages
German (de)
English (en)
Inventor
Werner Arts
Berndt Martens
Original Assignee
Lar Process Analysers 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 Lar Process Analysers Ag filed Critical Lar Process Analysers Ag
Publication of WO2009112199A1 publication Critical patent/WO2009112199A1/fr

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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
    • G01N33/18—Water
    • G01N33/1826—Organic contamination in water
    • G01N33/1846—Total carbon analysis

Definitions

  • the invention relates to a measuring method for determining the content of a chemical element or another water quality parameter in fresh water or wastewater, and to a measuring arrangement suitable for carrying out this method.
  • TOC total organic carbon
  • a small amount of water is usually supplied with the transport gas heated to a predetermined temperature furnace, where it evaporates and burns almost abruptly, and the combustion gas is fed to a NDIR-CO 2 detector. Its CO 2 content measurement result represents a measure of the C content of the water sample.
  • COD chemical oxygen demand
  • TOD total oxygen demand
  • WO 2005/064329 A1 of the applicant describes a method and an arrangement for determining water constituents, which likewise relate to the subject matter of the present patent application and in which the solution proposed here can be used.
  • nitrogen 3 which is supplied from a nitrogen cylinder, for example, at a pressure of 2.5-7 bar, enters a thermostated housing, the so-called permeation housing 5, in which a oxygen-permeable silicone tube 7 is located as oxygen diffusion path for diffusing oxygen from the atmosphere.
  • a pressure regulator 9 Upstream of the oxygen Einduffusionsddle 7 are a pressure regulator 9 and a pressure gauge 11. According to the values read on the pressure gauge, the pressure in the silicone tube 7 is set to 1.2 bar, for example.
  • the now oxygen-containing carrier gas stream 13 passes to the reaction and analysis device 15.
  • reaction and analysis processes whose exact sequence depends on the oxygen content of the carrier gas flow, but which are familiar to the person skilled in the art and therefore none here require more detailed explanation.
  • the known method and the known device have a fundamentally simple structure, which, however, substantially increases due to the requirement of a thermostatted housing.
  • the oxygen content of the carrier gas can only be adjusted with moderate precision with the silicone diffusion section, which also suffers from aging phenomena of the material.
  • the oxygen concentration of the carrier gas in the known arrangement can not readily and in any case does not change within wide limits, because it is largely determined by the material and the dimensions of the silicone tube.
  • the invention is therefore based on the object to provide an improved method and an improved arrangement, with which the oxygen content of the carrier gas can be adjusted precisely in long-term operation according to the requirements of a particular reaction and analysis process.
  • the invention includes the essential idea of departing from the indiffusion principle for the adjustment of the oxygen content of the carrier gas stream in a measuring method or a measuring arrangement of the generic type. she further includes the idea of departing from the previously practiced principle of oxygen supply from the atmosphere in a (previously) completely inert carrier gas and instead a valve-controlled admixture of inert gas to oxygen or air or vice versa of oxygen or air to an inert gas provided.
  • valve-controlled metered introduction is carried out as a control of a relative valve opening time.
  • valve-controlled metered introduction has the control of a relative flow rate and / or a gas pressure of one of the carrier gas constituents.
  • the former control principle can be implemented with standard electronic components in a particularly simple and flexible manner.
  • the introduction of oxygen or air and the introduction of the inert carrier gas component into a carrier gas flow path via controlled valves or under pressure control is such that the inert carrier gas component is introduced via a time-controlled microdosing into a pressure-controlled air flow, wherein in particular its pressure value is detected and processed to determine the timing of the microdosing.
  • this solution can also be implemented without real-time detection of the pressure of the regulated air flow or without the use of available measured values for real-time control.
  • the inert carrier gas component will essentially comprise nitrogen.
  • the inert carrier gas component comprises a noble gas, such as helium or argon. Both options can also be combined.
  • a currently preferred embodiment of the arrangement according to the invention provides that the controlled valve is designed as a time-controlled Mikrodosierventil and disposed between the oxygen or air source and the carrier gas line or between the source of the inert carrier gas component and the carrier gas line.
  • the controlled valve is designed as a time-controlled Mikrodosierventil and disposed between the oxygen or air source and the carrier gas line or between the source of the inert carrier gas component and the carrier gas line.
  • a design appears to be useful in which oxygen is metered via the micro-metering valve an air stream.
  • a further embodiment of the arrangement according to the invention provides that at least one inlet of the carrier gas line, a pressure regulator or flow regulator for controlling the pressure or the flow rate of the inflowing oxygen or the air or the inert carrier gas component is arranged.
  • a pressure or flow rate measuring device for measuring the current pressure or the current flow rate of the oxygen or the air or the inert carrier gas component may be provided whose output is connected to a control signal input of a control unit of the or at least one valve is.
  • a flow restrictor for limiting the flow rate of the oxygen or the air or the inert carrier gas component is arranged or in the carrier gas line near the output to the analysis device a buffer gas storage for buffering the carrier gas stream is arranged.
  • FIG. 2 This shows a measuring device 17, in which oxygen is valve-controlled metered a stream of purified air 19, through a micro-metering valve 21, which by a valve opening timing control unit 23 (for example, having the parameters indicated in the figure) is driven.
  • the pressure in the (only symbolically represented) supply line of the air flow is also in this solution by a pressure regulator 25 regulated and detected by a pressure gauge 27.
  • Nitrogen 29 passes (for example, from a nitrogen cylinder) via a flow restrictor (a so-called "critical nozzle") 31 to the aforementioned micro-metering valve 21 and is metered there the air stream 19.
  • the flow limitation can be carried out, for example, at a nitrogen pressure of 1 bar to a maximum flow of 301 / h.
  • the nitrogen-added carrier gas stream finally passes through a buffer memory 33 to compensate for pressure fluctuations to a known reaction and analysis device 35th
  • the pressure values detected by the pressure gauge 27 are fed to a pressure / opening time processing unit 37 which receives a process-specific input of the valve opening timing control unit 23 as a result of the processing of the Provides pressure values.
  • a pressure / opening time processing unit 37 which receives a process-specific input of the valve opening timing control unit 23 as a result of the processing of the Provides pressure values.
  • the activity of the Mikrodosierventils and thus the effective nitrogen supply to the oxygen-containing air stream 19 can be tracked in quasi-real time the actual pressure of the air flow.
  • the valve opening timing control unit 23 is provided with manual adjustment controls and, if necessary, program control for realizing predetermined metering valve settings.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

L'invention porte sur un procédé de mesure pour déterminer la teneur d'une eau fraîche ou d'une eau résiduaire en un élément chimique, en particulier le carbone et/ou l'azote et/ou le phosphore, ou en un autre paramètre de qualité de l'eau, en particulier la demande totale en oxygène DTO, dans lequel un échantillon de l'eau fraîche ou de l'eau résiduaire, se trouvant dans un courant de gaz porteur contenant de l'oxygène, étant envoyé à une réaction, et le produit de la réaction étant analysé pour déterminer la teneur en les différents éléments, ou d'autres paramètres, la proportion d'oxygène du gaz porteur étant ajustée par injection, en une quantité commandée par une vanne, d'oxygène ou d'air, dans un courant d'un constituant d'un gaz porteur inerte, et/ou par une injection, commandée par une vanne, du constituant inerte dans un courant d'oxygène ou d'air.
PCT/EP2009/001577 2008-03-12 2009-03-05 Dispositif de mesure et montage de mesure pour déterminer la teneur de l'eau fraîche ou d'une eau résiduaire en un élément chimique ou en un autre paramètre de qualité de l'eau WO2009112199A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008013754.5 2008-03-12
DE200810013754 DE102008013754A1 (de) 2008-03-12 2008-03-12 Messverfahren und Messanordnung zur Bestimmung des Gehalts eines chemischen Elements oder eines anderen Wasserqualitätsparameters in Frisch- oder Abwasser

Publications (1)

Publication Number Publication Date
WO2009112199A1 true WO2009112199A1 (fr) 2009-09-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/001577 WO2009112199A1 (fr) 2008-03-12 2009-03-05 Dispositif de mesure et montage de mesure pour déterminer la teneur de l'eau fraîche ou d'une eau résiduaire en un élément chimique ou en un autre paramètre de qualité de l'eau

Country Status (2)

Country Link
DE (1) DE102008013754A1 (fr)
WO (1) WO2009112199A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014118138A1 (de) * 2014-12-08 2016-06-09 Lar Process Analysers Ag Analyseanordnung zur Wasser- und Abwasseranalyse
DE102015120095A1 (de) 2015-11-19 2017-05-24 Analytik Jena Ag Analysegerät und Verfahren

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3560156A (en) * 1965-05-03 1971-02-02 Dow Chemical Co Determining the oxygen demand of combustible materials in aqueous dispersions
US3784359A (en) * 1971-11-03 1974-01-08 Dow Chemical Co Analytical apparatus
US3819499A (en) * 1971-04-30 1974-06-25 Philips Corp Device for detecting one or more oxidizable components in a sample
EP0586969A2 (fr) * 1992-08-31 1994-03-16 FISONS INSTRUMENTS S.p.A. Procédé et appareil de détermination de la teneur totale en azote par l'analyse élémentaire
EP0940677A1 (fr) * 1998-03-04 1999-09-08 THERMOQUEST ITALIA S.p.A. Procédé et dispositif d'analyse élémentaire

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3265830B2 (ja) 1994-05-27 2002-03-18 株式会社島津製作所 全有機体炭素計
DE10360445A1 (de) 2003-12-22 2005-07-28 Lar Analytik & Umweltmesstechnik Gmbh Verfahren und Anordnung zur Bestimmung von Wasserinhaltsstoffen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3560156A (en) * 1965-05-03 1971-02-02 Dow Chemical Co Determining the oxygen demand of combustible materials in aqueous dispersions
US3819499A (en) * 1971-04-30 1974-06-25 Philips Corp Device for detecting one or more oxidizable components in a sample
US3784359A (en) * 1971-11-03 1974-01-08 Dow Chemical Co Analytical apparatus
EP0586969A2 (fr) * 1992-08-31 1994-03-16 FISONS INSTRUMENTS S.p.A. Procédé et appareil de détermination de la teneur totale en azote par l'analyse élémentaire
EP0940677A1 (fr) * 1998-03-04 1999-09-08 THERMOQUEST ITALIA S.p.A. Procédé et dispositif d'analyse élémentaire

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DE102008013754A1 (de) 2009-09-17

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