WO2002090943A1 - Vorrichtung und verfahren zur spektroskopischen messung einer gaskonzentration - Google Patents
Vorrichtung und verfahren zur spektroskopischen messung einer gaskonzentration Download PDFInfo
- Publication number
- WO2002090943A1 WO2002090943A1 PCT/EP2002/004823 EP0204823W WO02090943A1 WO 2002090943 A1 WO2002090943 A1 WO 2002090943A1 EP 0204823 W EP0204823 W EP 0204823W WO 02090943 A1 WO02090943 A1 WO 02090943A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- process gas
- gas
- shield
- laser
- beam path
- Prior art date
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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
Definitions
- the invention relates to a device and a method for measuring a concentration of at least one component of a process gas with a laser, the beam path of the laser crossing a volume containing the process gas.
- Measuring methods and devices are known for determining the concentration of individual components of a gas mixture, which are determined using a laser for laser gas spectroscopic measurements.
- the present invention is therefore based on the object of providing an improved method and an improved device for carrying out laser gas spectroscopic measurements of the concentration of the components of a process gas, the suitability of the invention being particularly important even for large volumes of dust-laden process gases Importance.
- the object is achieved in that the beam path partly leads freely through the process gas and partly shields itself from the process gas, only the part of the beam path that leads freely through the process gas being referred to as the measuring section.
- the shielding of the beam path is preferably designed as a hollow body.
- Means are particularly preferably provided in the area of the shield for feeding a purge gas, which serves to displace the process gas from the shield, in particular from the interior of the hollow body.
- a purge gas which serves to displace the process gas from the shield, in particular from the interior of the hollow body.
- Nitrogen for example, is very suitable as the purge gas.
- Inert gases are also generally considered suitable. The suitability of a gas as a purge gas depends, among other things. depending on which component of the process gas the concentration is to be determined.
- the shield is tubular.
- the shield is particularly advantageously designed as a water-cooled lance. This embodiment enables the device according to the invention for measuring the concentration to be used without problems even in process gases which have a very high temperature.
- the shield has a heat-resistant and / or acid-resistant material.
- the shield preferably has a ceramic material. These materials also enable problem-free use of the device according to the invention under difficult conditions, for example in the presence of acidic components in the process gas.
- the shield is attached to the laser at the beginning of the beam path and in front of a detector which is hit by the laser radiation, as a result of which the measuring path is limited by the shield from both sides.
- the task is solved in that the beam path leads partially freely through the process gas and partially shields itself from the process gas, whereby only the part of the beam path that leads freely through the process gas is referred to as the measuring section and leads to a laser gas spectroscopic measurement of gas concentrations is used.
- the method designed in this way enables reliable measurement even over larger measuring sections and in process gases which are contaminated with dust or are otherwise contaminated or generally mixed with particles.
- the shield is advantageously flushed with a purge gas.
- Nitrogen is particularly advantageously used as the purge gas.
- a clean gas known in its composition inside the shield, through which the laser beam experiences almost no weakening of its intensity and which behaves neutrally for the concentration measurement, i.e. makes no contribution unless the concentration of a nitrogen compound is to be measured.
- the suitability of a gas as a purge gas depends on which component of the process gas the concentration is to be determined.
- a purging gas is preferably selected which differs significantly from the gas whose concentration is to be determined with regard to spectroscopy.
- Inert gases can also advantageously be used as purge gases.
- the particular advantage of inert gases is that a chemical reaction between the purge gas and the process gas can be excluded.
- ambient air is drawn in and used as the purge gas. This configuration primarily offers the
- ambient air is not desirable in all applications, for example when determining the CO concentration in an exhaust gas, ambient air as the purge gas would lead to a fault in the measurement.
- nitrogen is preferred as the purge gas for measurements of the oxygen concentration in a process gas.
- the invention also has the advantage that a laser with low power can be used to measure the concentration, since the measuring distance is shortened by the shielding according to the invention in comparison to a measurement without shielding.
- the use of a laser with low power also advantageously reduces the risk of undesired changes in the process gas, which could be triggered by the energy of the laser radiation in the process gas.
- Figure a cross section through a volume containing the process gas
- the figure shows a tubular volume 1 containing the process gas, which has a laser 2a on one side and a detector 2b on the opposite side, which registers the laser radiation crossing the volume 1 and incident on the detector 2b.
- the beam path of the laser 2a is partially surrounded by the shield 3, which delimits the measuring section 4 on both sides, both in the direction of the laser 2a and in the direction of the detector 2b.
- Means for feeding a purge gas such as e.g. Nitrogen provided. These means are not shown in the figure.
- Volume 1 is filled, for example, with a hot process gas whose carbon monoxide content is to be determined.
- a shield 3 is used, which has two water-cooled ceramic tubes 3.
- Gaseous nitrogen is used as the purge gas, which displaces the process gas from the interior of the ceramic tubes 3, which are cooled, for example, by tube coils (not shown) carrying cooling water.
- a shield 3 advantageously has dimensions such that the Measuring section 4 is, for example, a length of 10 cm to 30 cm.
- a measuring section 4 of approximately 20 cm has proven to be particularly advantageous.
- the laser measurements can be carried out with particular advantage as continuous measurements. In a further embodiment of the invention, however, discontinuous measurement methods can also be used successfully.
Landscapes
- 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)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR0209388-0A BR0209388A (pt) | 2001-05-05 | 2002-05-02 | Processo e dispositivo para a medição espectroscópica de uma concentração de gás |
CA002446122A CA2446122A1 (en) | 2001-05-05 | 2002-05-02 | Device and method for the spectroscopic measurement of a concentration of gas |
EP02753039A EP1386136A1 (de) | 2001-05-05 | 2002-05-02 | Vorrichtung und verfahren zur spektroskopischen messung einer gaskonzentration |
US10/476,696 US20040207851A1 (en) | 2001-05-05 | 2002-05-02 | Device and method for the spectroscopic measurement of concentration gas |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10121932.6 | 2001-05-05 | ||
DE10121932A DE10121932A1 (de) | 2001-05-05 | 2001-05-05 | Vorrichtung und Verfahren zur spektroskopischen Messung einer Gaskonzentration |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002090943A1 true WO2002090943A1 (de) | 2002-11-14 |
Family
ID=7683768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/004823 WO2002090943A1 (de) | 2001-05-05 | 2002-05-02 | Vorrichtung und verfahren zur spektroskopischen messung einer gaskonzentration |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040207851A1 (de) |
EP (1) | EP1386136A1 (de) |
BR (1) | BR0209388A (de) |
CA (1) | CA2446122A1 (de) |
DE (1) | DE10121932A1 (de) |
WO (1) | WO2002090943A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7223978B2 (en) | 2003-09-01 | 2007-05-29 | L'Air Liquide, Société Anonyme à Directoire et Conseil de Surveillance pour l'Étude et l'Exploitation des Procédés Georges Claude | Method for measuring gaseous species by derivation |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4443072A (en) * | 1982-04-05 | 1984-04-17 | The United States Of America As Represented By The United States Department Of Energy | Purged window apparatus utilizing heated purge gas |
US5069551A (en) * | 1989-11-24 | 1991-12-03 | Iowa State University Research Foundation, Inc. | Method and apparatus of measuring unburned carbon in fly ash |
US5120129A (en) * | 1990-10-15 | 1992-06-09 | The Dow Chemical Company | Spectroscopic cell system having vented dual windows |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3820901A (en) * | 1973-03-06 | 1974-06-28 | Bell Telephone Labor Inc | Measurement of concentrations of components of a gaseous mixture |
US4583859A (en) * | 1984-03-30 | 1986-04-22 | The Babcock & Wilcox Company | Filter cleaning system for opacity monitor |
JPH065155B2 (ja) * | 1984-10-12 | 1994-01-19 | 住友金属工業株式会社 | 窯炉の炉壁補修装置 |
US5291030A (en) * | 1992-06-04 | 1994-03-01 | Torrex Equipment Corporation | Optoelectronic detector for chemical reactions |
US5424842A (en) * | 1993-04-27 | 1995-06-13 | Cummins Electronics Company, Inc. | Self-cleaning system for monitoring the opacity of combustion engine exhaust using venturi effect |
US6011882A (en) * | 1997-10-16 | 2000-01-04 | World Precision Instruments, Inc. | Chemical sensing techniques employing liquid-core optical fibers |
US6943886B2 (en) * | 2002-02-11 | 2005-09-13 | Air Liquide America, L.P. | Method for enhanced gas monitoring in high particle density flow streams |
-
2001
- 2001-05-05 DE DE10121932A patent/DE10121932A1/de not_active Withdrawn
-
2002
- 2002-05-02 US US10/476,696 patent/US20040207851A1/en not_active Abandoned
- 2002-05-02 EP EP02753039A patent/EP1386136A1/de not_active Withdrawn
- 2002-05-02 CA CA002446122A patent/CA2446122A1/en not_active Abandoned
- 2002-05-02 BR BR0209388-0A patent/BR0209388A/pt not_active IP Right Cessation
- 2002-05-02 WO PCT/EP2002/004823 patent/WO2002090943A1/de not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4443072A (en) * | 1982-04-05 | 1984-04-17 | The United States Of America As Represented By The United States Department Of Energy | Purged window apparatus utilizing heated purge gas |
US5069551A (en) * | 1989-11-24 | 1991-12-03 | Iowa State University Research Foundation, Inc. | Method and apparatus of measuring unburned carbon in fly ash |
US5120129A (en) * | 1990-10-15 | 1992-06-09 | The Dow Chemical Company | Spectroscopic cell system having vented dual windows |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7223978B2 (en) | 2003-09-01 | 2007-05-29 | L'Air Liquide, Société Anonyme à Directoire et Conseil de Surveillance pour l'Étude et l'Exploitation des Procédés Georges Claude | Method for measuring gaseous species by derivation |
Also Published As
Publication number | Publication date |
---|---|
DE10121932A1 (de) | 2002-11-07 |
EP1386136A1 (de) | 2004-02-04 |
US20040207851A1 (en) | 2004-10-21 |
BR0209388A (pt) | 2004-07-06 |
CA2446122A1 (en) | 2002-11-14 |
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