WO2012126470A1 - Capteur de gaz haute-température - Google Patents

Capteur de gaz haute-température Download PDF

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Publication number
WO2012126470A1
WO2012126470A1 PCT/DK2012/000027 DK2012000027W WO2012126470A1 WO 2012126470 A1 WO2012126470 A1 WO 2012126470A1 DK 2012000027 W DK2012000027 W DK 2012000027W WO 2012126470 A1 WO2012126470 A1 WO 2012126470A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
gas sensor
sensor
sight
sight tube
Prior art date
Application number
PCT/DK2012/000027
Other languages
English (en)
Inventor
Jens Møller JENSEN
Poul Kodahl SØRENSEN
Rainer Buchner
Per Romedahl CHRISTENSEN
Kenneth PIHL
Oluf Sigh OLESEN
Original Assignee
Danfoss Ixa A/S
Green Instruments A/S
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 Danfoss Ixa A/S, Green Instruments A/S filed Critical Danfoss Ixa A/S
Priority to EP12712907.0A priority Critical patent/EP2694806A1/fr
Publication of WO2012126470A1 publication Critical patent/WO2012126470A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G01N21/09—Cuvette constructions adapted to resist hostile environments or corrosive or abrasive materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G01N21/0332—Cuvette constructions with temperature control
    • G01N2021/0335—Refrigeration of cells; Cold stages
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • Gas sensor enable to measure gas based on the absorption bands of radiation characteristic to the gas of interest, where the sensor is adapted to operate in environments with gases having temperatures usually too high for the delicate parts of the sensor to endure.
  • the present invention introduces a cooling device connected to the sensor for ensuring a lowered temperature in the vicinity of the delicate parts.
  • Gas sensors configured to measure a gas based on absorption bands of bands of radiation characteristic to the gas of interest is widely known, for example as disclosed in WO10118748A describing a sensor having a filter arrangement, downstream of which there is arranged a detector arrangement, and an evaluating device which is connected to the detector arrangement, the filter arrangement has at least a first filter, the suspect filter, which is configured as a band pass filter allowing the passage of a first predetermined band, the suspect band, at least one second filter, the reference filter(s), which is configured as a band pass filter allowing the passage of a second predetermined band(s), the reference band(s), and where the detector arrangement has at least one detector associated with at least one of the filters.
  • the band passes reference filters are distributed above and below the band pass of the suspect filter.
  • a second document WO10118749A discloses a related sensor relating to the fact that particles or substances in general are present in the environment where the sensor operates, and that these over time gets into contact with more delicate parts of the sensor, decreasing the time of operation of the sensor, before maintenances or even exchange is needed. It is therefore often desired to keep the more delicate parts of the sensor physically separated from the media or environment containing the substances or species being measured by the sensor.
  • the present invention solves this problem by introducing sight glasses positioned at least in front of the delicate parts of the sensor, the sight glasses in general being formed with coating(s) chosen according to the environment wherein the sight glasses are to be used.
  • the present invention in the preferred, but not exclusive, embodiment relates to sensors of the same kind as described in the documents WO10118749A and WO10118748A, but where the sensor is configured such, that it may operate in conditions with temperatures so high, that they might damage the delicate parts of the sensor.
  • a detector adapted to measure the light at least in the range of the absorption band
  • a first sight tube connected to the detector separating it from the measurement region, and wherein a cooling device is connected in a heat transfer manner to the sight tube.
  • the cooling device thus ensures that the area in front of the detector has a lower temperature than the gas to be measured.
  • an embodiment further introduces at least one sight glass positioned in a manner the detector sealed from the measurement region, and it is especially suited that the sight glass is fixed to the first sight tube in a manner where an gas tight internal enclosure of the first sight tube is defined separating the detector from the measurement region.
  • a second sight glass is fixed to the first sight tube in a manner where a gas tight internal enclosure of the first sight tube is defined separating the detector from the measurement region. Then the internal enclosure is filled with a gas inert to the gas to be measured.
  • a second sight tube constructed as the first sight tube may be connected to the light source sealing it from the measurement region.
  • the cooling device is adapted to transfer a heat transfer fluid the cooling based on vapour-compression.
  • the cooling device is a heat sink.
  • the sight tube comprises a section of a material with a heat transfer characteristic substantially lower than the rest of the sight tube.
  • At least a section of the internal surface(s) of the sight tube(s) is adapted to spread the light emitted by the light, such as by forming a substantially rough surface of a highly reflective material.
  • the measurement region is the volume within the internal of a porous structure comprising at least one opening forming communication from the measurement region to the environment comprising the gas. It is especially advantagous that the porous structure is fixed to the sight tube(s). To avoid shears and stresses in the sensor, several of the different are made of materials with substantially similar heat transfer characteristics, however it is an advantage that the cooling device is made of materials with substantially higher heat transfer characteristics than the sight tubes.
  • FIG. 1 Illustration of a setup of a gas sensor according to the present invention.
  • Fig. 2 Illustration of the sensor of the present invention positioned in a sensor container.
  • Fig. 1 shows a diagrammatic view of a gas sensor (1) for determining for example the CO2 content (carbon dioxide content) in a measurement region (3), where the sensor (1) comprises a detection part (2) and an light source (4) emitting light within a desired span of wavelengths defined by the specific gas, or gasses, to be measured, frequently within the such span of IR frequencies.
  • the sensor (1) comprises a detection part (2) and an light source (4) emitting light within a desired span of wavelengths defined by the specific gas, or gasses, to be measured, frequently within the such span of IR frequencies.
  • the CO2 molecules are present in the measurement region (2), the CO2 molecules being represented herein by small circles.
  • the gas molecules (5) absorb IR rays in a specific spectral range, as represented by the arrows. The greater the concentration of CO 2 the lower the energy in a specific spectral range that can be detected in the gas sensor (1).
  • the measurement region (3) may be defined as the internal a porous structure (6), such that the sensor device (2) is fixed at first end of the porous structure (6) and the light source (4) is fixed at a second end.
  • the porous structure (6) may be formed such that gas (5) may enter and leave its internal hollow, the measurement region (3), through openings (21) and (22)) in its wall. However, in an alternative version, it is gas tight the gas to be measured being filled into the internal.
  • sight glasses (8) are introduced to form a gas tight separation of the light source (4) and the detector (2) from the measurement region (2), but still ensuring optic communication from the light source (4) to the detector device (2).
  • the porous structure (6) is such that it forms a stable alignment of the detector (2) to the light source (4), despite changes in the ambient conditions such as the humidity, temperature, vibrations etc.
  • a first (9) and / or second (10) sight tube may be connected to the porous structure (6) and detector (2) and / or light source (4).
  • the sight tube is hollow and may be forming an internal being gas tight sealed from the externals and the measurement region (3), still maintaining the optic communication from the light source (4) to the detector device (2).
  • the internal(s) of the sight tube(s) may be filled with a gas inert to the wavelengths of the system. This helps to ensure no absorption occurs in the sight tubes (9) and (10) affecting the signal.
  • one or both of the sight tubes (9) and (10) comprises sight glasses (8) attached either at one or both ends of the sight tube(s), where they may be attached in a manner, where they form the gas tight internal(s) of the sight tube(s).
  • a cooling device (1 1 ) is connected to at least one of the sight tubes (9) and / or (10), being adapted to cool down the gasses inside the sight tube(s) (9) and / or (10). It has been found that even for conditions in the measurement region (2) with a temperature higher than 300 degrees Celcius, just three such cooling ribs (1 1 a) are sufficient to ensure temperatures close to the detector (2) and /or light source (4) in the area of 40-50 degrees Celcius.
  • the sight tubes (9) and (10), are made of material(s) able to endure the high temperature, but is also internally equipped with surfaces with at least some reflectance in order to ensure that sufficient of the light emitted by the light source (4) reaches the detector (2), rather than being absorbed by the surfaces.
  • the cooling device may be active or in-active.
  • Active in the present context is to be understood as making an active cooling e.g. using a technology similar to the one in refrigerators and freezers based on the principle of vapor- compression where a heat transfer fluid circulated in the cooling ribs (1 1 a).
  • Inactive in the present context is to be understood as 'passive' transfer of the heat e.g. by a heat sink.
  • the cooling device (1 1 ), preferable is made of materials with substantially higher heat transfer characteristics than other parts of the gas sensor (1 ), especially the sight tubes (9) and (10), such as in a not limiting example, the sight tubes (9) and (10) being made of titanium and the cooling device (1 1 ) of aluminium
  • the materials of the sight tubes (9) and (10) preferable is such that they at least has the same heat transfer characteristics as the other parts of the gas sensor (1 ) (but not the cooling device (1 1 )), since this would ensure the different connected parts react to the temperature in the same manner.
  • one or both of the sight tubes (9) and (10) is equipped with a section (12) (or even a plural of sections (12) in succession) of a low heat conductance material, such as plastic, or other suitable material.
  • the separate sections (12', 12) of the sight tubes (9) and (10) may be connected and fixed together in any manner as known in the art.
  • the internal surfaces (13) of the sight tubes is made such that that it scatters the light as it reflects from the internal surfaces (13) in its path from the light source (4) to the detector (2).
  • 'dark spots' does not influence the measurements in that the incoming light reaching the detector (2) in that the light will be scattered to 'blur out' any such 'dark spots'.
  • 'dark spots' is to be understood such that there is areas of the detector (2) not being enlightened, this affecting the measurements in that the detector (2) will be calibrated as if all the detector area are 'active' in the measurement.
  • Making such an internal surface helping to scatter the light may be performed in any manner as known in the art, such as forming a substantial rough surface scattering the light sufficient randomly.
  • the present invention is not limited to one or all of the described embodiments, but any number and combination of the embodiments apply.
  • the sensor (1 ) of the present system preferable is made in a manner where each of the parts, sensor (2), light source (4), separation structures (9) and (10), and porous structure (6) are individually easily exchangeable.
  • Each of the parts may be connected to other parts in any manner as known in the art, such as by equipping the parts with windings so that they may be screwed together, or by e.g. using feasible standard fittings such as those known for hydraulic tubing.
  • the sensor (1 ) in one embodiment of the present invention is positioned within the internal of a sensor container (200) as seen in Fig. 2, where the sensor container (200) is equipped with a gas inlet (210) externally connected to the environment comprising the gas to be measured, thus forming a gas communication from this environment to the internal of the sensor container (200).
  • the communication may be by a tube connected to the gas inlet (210).
  • the sensor container (200 has a gas outlet (211) forming a connection from its inside to any environment where the gas that has been measured are to be fed. This could be to an exchangeable container, to the externals, or more preferable back into the environment containing the gas to be measured.
  • the gas inlet (210) of the sensor container (200) is connected to the inlet opening (7, 21) of the gas sensor (1)) and the gas outlet (211) connected to the outlet opening (22) of the gas sensor (1).
  • a stream of gas in the internal of the sensor container (200) may then be induced by vacuum or pumping means of any kind as known in the arts.
  • the gas will then flow in and out through the openings (21) and (22) of the porous structure (6) and thus in and out of the measurement region (2), preferable at a constant flow rate.
  • the first (9) and second (10) sight tubes may optionally be mounted in a way such that they defines hermetically sealed volumes, where one or both of these in a preferred embodiment is filled with and gas inactive to the radiation frequency span of the light source (4). This may help to get rid of any cross- correlations, and the volume(s) may additionally be filled with a gas of high concentration in order to filter the specific wavelengths out.
  • the volume may be filled with any gas, as long as the concentrations are stable over time meaning that the volume is hermetically filled.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

La présente invention se rapporte à un capteur de gaz pouvant mesurer un gaz sur la base des bandes d'absorption de rayonnement caractéristiques du gaz étudié, le capteur pouvant mesurer des gaz ayant des températures normalement trop élevées pour que les pièces fragiles du capteur puissent les supporter. La présente invention prévoit un dispositif de refroidissement relié au capteur pour garantir une température diminuée à proximité des pièces fragiles.
PCT/DK2012/000027 2011-03-23 2012-03-21 Capteur de gaz haute-température WO2012126470A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12712907.0A EP2694806A1 (fr) 2011-03-23 2012-03-21 Capteur de gaz haute-température

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201100205 2011-03-23
DKPA201100205 2011-03-23

Publications (1)

Publication Number Publication Date
WO2012126470A1 true WO2012126470A1 (fr) 2012-09-27

Family

ID=45936602

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2012/000027 WO2012126470A1 (fr) 2011-03-23 2012-03-21 Capteur de gaz haute-température

Country Status (2)

Country Link
EP (1) EP2694806A1 (fr)
WO (1) WO2012126470A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016183972A (ja) * 2012-10-18 2016-10-20 ブイユーブイ・アナリティクス・インコーポレイテッドＶＵＶ Ａｎａｌｙｔｉｃｓ，Ｉｎｃ． 真空紫外吸収分光システム
US10677767B2 (en) 2018-06-12 2020-06-09 Vuv Analytics, Inc. Vacuum ultraviolet absorption spectroscopy system and method
CN111435112A (zh) * 2019-01-11 2020-07-21 横河电机株式会社 气体分析设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110361353A (zh) * 2019-08-15 2019-10-22 深圳市诺安环境安全股份有限公司 具有自适应反光件的气体浓度检测装置及报警装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3281597A (en) * 1965-09-23 1966-10-25 Greenberg Melvin Infrared device for measuring steam quality
WO1983004098A1 (fr) * 1982-05-10 1983-11-24 United Technologies Corporation Detecteur au laser de particules par diffusion en avant
EP1347290A1 (fr) * 2002-03-22 2003-09-24 Instrumentarium Corporation Analyseur de gaz utilisant des détecteurs thermiques
EP1724567A1 (fr) * 2005-05-17 2006-11-22 Nitrex Metal Inc Appareil et procédé de contrôle de l'atmosphère dans le traitement des métaux à chaud
US20090101823A1 (en) * 2007-10-19 2009-04-23 Honeywell International Inc. System and method of monitoring with temperature stabilization
DE102008058785A1 (de) * 2008-11-24 2010-05-27 Forschungszentrum Dresden - Rossendorf E.V. Prozessmikroskop
WO2010118748A1 (fr) 2009-04-17 2010-10-21 Danfoss Ixa A/S Capteurs utilisant des filtres passe-bande
WO2010118749A1 (fr) 2009-04-17 2010-10-21 Danfoss Ixa A/S Détecteur de gaz avec regard de filtration

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050128486A1 (en) * 2002-04-24 2005-06-16 Linde Aktiengesellschaft Device and method for spectroscopically measuring a gas concentration by determining a single absorption line

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3281597A (en) * 1965-09-23 1966-10-25 Greenberg Melvin Infrared device for measuring steam quality
WO1983004098A1 (fr) * 1982-05-10 1983-11-24 United Technologies Corporation Detecteur au laser de particules par diffusion en avant
EP1347290A1 (fr) * 2002-03-22 2003-09-24 Instrumentarium Corporation Analyseur de gaz utilisant des détecteurs thermiques
EP1724567A1 (fr) * 2005-05-17 2006-11-22 Nitrex Metal Inc Appareil et procédé de contrôle de l'atmosphère dans le traitement des métaux à chaud
US20090101823A1 (en) * 2007-10-19 2009-04-23 Honeywell International Inc. System and method of monitoring with temperature stabilization
DE102008058785A1 (de) * 2008-11-24 2010-05-27 Forschungszentrum Dresden - Rossendorf E.V. Prozessmikroskop
WO2010118748A1 (fr) 2009-04-17 2010-10-21 Danfoss Ixa A/S Capteurs utilisant des filtres passe-bande
WO2010118749A1 (fr) 2009-04-17 2010-10-21 Danfoss Ixa A/S Détecteur de gaz avec regard de filtration

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2694806A1 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016183972A (ja) * 2012-10-18 2016-10-20 ブイユーブイ・アナリティクス・インコーポレイテッドＶＵＶ Ａｎａｌｙｔｉｃｓ，Ｉｎｃ． 真空紫外吸収分光システム
US9891197B2 (en) 2012-10-18 2018-02-13 Vuv Analytics, Inc. Vacuum ultraviolet absorption spectroscopy system and method
US9976996B2 (en) 2012-10-18 2018-05-22 Vuv Analytics, Inc. Vacuum ultraviolet absorption spectroscopy system and method
US10338040B2 (en) 2012-10-18 2019-07-02 Vuv Analytics, Inc. Vacuum ultraviolet absorption spectroscopy system and method
US10641749B2 (en) 2012-10-18 2020-05-05 Vuv Analytics, Inc. Vacuum ultraviolet absorption spectroscopy system and method
US10677767B2 (en) 2018-06-12 2020-06-09 Vuv Analytics, Inc. Vacuum ultraviolet absorption spectroscopy system and method
CN111435112A (zh) * 2019-01-11 2020-07-21 横河电机株式会社 气体分析设备

Also Published As

Publication number Publication date
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