DE20200373U1 - Measuring probe for measuring O2 and CO in flue gases - Google Patents
Measuring probe for measuring O2 and CO in flue gasesInfo
- Publication number
- DE20200373U1 DE20200373U1 DE20200373U DE20200373U DE20200373U1 DE 20200373 U1 DE20200373 U1 DE 20200373U1 DE 20200373 U DE20200373 U DE 20200373U DE 20200373 U DE20200373 U DE 20200373U DE 20200373 U1 DE20200373 U1 DE 20200373U1
- Authority
- DE
- Germany
- Prior art keywords
- measuring
- sensor
- flue gas
- measuring probe
- gas duct
- 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.)
- Expired - Lifetime
Links
- 239000003546 flue gas Substances 0.000 title claims description 26
- 239000000523 sample Substances 0.000 title claims description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 20
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
Köln, den 10. Januar 2002Cologne, 10 January 2002
Anmelderin: ENOTEC GmbHApplicant: ENOTEC GmbH
Anwaltszeichen: E 117/10Attorney reference: E 117/10
Die Erfindung betrifft eine in situ angeordnete Meßsonde zum Messen von O2 und CO in heißen Rauchgasen mit einem mit einem Flansch an einem Rauchgaskanal befestigten und in diesen hineinragenden, im wesentlichen zylindrischen Meßsondenrohr. The invention relates to an in situ arranged measuring probe for measuring O 2 and CO in hot flue gases with a substantially cylindrical measuring probe tube attached to a flue gas duct by means of a flange and projecting into the latter.
Meßsonden, mit denen der Anteil von entweder O2 oder CO in Rauchgasen gemessen wird, sind bekannt. Bekannte Anwendungen sind das Messen von O2 CO und anderen Gasen in den Abgasen von Kraftfahrzeugen. Weite Anwendung finden diese Sonden auch beim Messen der Anteile von O2 und CO in den Abgasen von Verbrennungsanlagen, insbesondere bei Wärmekraftwerken. Eine weitere Anwendung findet sich bei der Zementherstellung zur Rauchgasanalyse in einem Zement-Drehofen. Auch hier wird der Anteil von O2 und CO in den heißen Rauchgasen gemessen.Measuring probes that measure the proportion of either O 2 or CO in flue gases are well known. Well-known applications include measuring O 2 CO and other gases in the exhaust gases of motor vehicles. These probes are also widely used to measure the proportions of O 2 and CO in the exhaust gases of combustion plants, particularly thermal power plants. Another application is in cement production for flue gas analysis in a rotary cement kiln. Here, too, the proportion of O 2 and CO in the hot flue gases is measured.
Bisher wird das zu untersuchende Rauchgas über eine Leitung einer entfernt liegenden Meßstelle zugeführt und dort analysiert. Dies führt zu einer zeitlich verzögerten Messung. Ein weiterer Nachteil liegt darin, daß die Meßleitung im Laufe der Zeit verschmutzt und sich zusetzen kann.Up to now, the flue gas to be examined has been fed via a pipe to a remote measuring point and analyzed there. This leads to a delayed measurement. Another disadvantage is that the measuring pipe can become dirty and clogged over time.
An den Erfinder wurde der Wunsch herangetragen, eine Meßsonde so auszubilden, daß sie ohne Gasentnahme über eine Leitung und Zufuhr zu einer entfernt liegenden Meßstelle arbeitet. Weiter soll die Messung verzögerungsfrei erfolgen. Dabei soll der Anteil von O2 und von CO in Rauchgas gemessen werden.The inventor was asked to design a measuring probe that would work without gas extraction via a pipe and supply to a remote measuring point. Furthermore, the measurement should be carried out without delay. The proportion of O2 and CO in flue gas should be measured.
Erwähnt sei noch, daß das Beheizen von Sensoren, insbesondere von O2-Sensoren, auf höhere Temperaturen bekannt ist. Dieses Aufheizen eines 02-Sensors ist Voraussetzung für seine Funktion. Die Beheizung erfolgt elektrisch.It should also be mentioned that the heating of sensors, especially O 2 sensors, to higher temperatures is known. This heating of an O 2 sensor is a prerequisite for its function. The heating is carried out electrically.
Bisher hat die Fachwelt angenommen, daß sich ein O2-Sensor und ein CO-Sensor nicht im Rauchgaskanal selbst anordnen lassen. Der Erfinder hat dieses Vorurteil gegen die gleichzeitige Anordnung der beiden Sensoren im Rauchgaskanal überwunden. Zur Lösung der vorstehend genannten Aufgabe schlägt der Erfinder bei einer Meßsonde der eingangs genannten Gattung vor, daß das Meßsondenrohr in seinem im Rauchgaskanal liegenden Bereich eine im wesentlichen zylindrisch ausgeführte Meßkammer aufweist, die Meßkammer durch ein gasdurchlässiges Filter abgeschlossen ist, das Meßsondenrohr in seinem außerhalb des Rauchgaskanals liegenden Bereich in einem Anschlußkasten endet und in der Meßkammer ein beheizter O2-Sensor und ein CO-Sensor in räumlicher Nähe so zueinander angeordnet sind, daß die von dem O2-Sensor erzeugte Wärme den CO-Sensor erfaßt. Zweckmäßig ist die Meßkammer doppelwandig.Until now, experts have assumed that an O 2 sensor and a CO sensor cannot be arranged in the flue gas duct itself. The inventor has overcome this prejudice against the simultaneous arrangement of the two sensors in the flue gas duct. To solve the above-mentioned problem, the inventor proposes that a measuring probe of the type mentioned at the beginning should have a substantially cylindrical measuring chamber in the area of the measuring probe tube lying in the flue gas duct, the measuring chamber be closed off by a gas-permeable filter, the measuring probe tube end in a junction box in the area lying outside the flue gas duct, and a heated O 2 sensor and a CO sensor are arranged in the measuring chamber in close proximity to one another in such a way that the heat generated by the O 2 sensor detects the CO sensor. The measuring chamber is expediently double-walled.
Die an sich bekannte Beheizung des O2-Sensors bringt bei der erfindungsgemäßen Anordnung des CO-Sensors in seiner räumlichen Nähe den Vorteil, daß an dem CO-Sensor eine katalytisch exotherme Oxidation von CO zu CO2 ohne zusätzliche Beheizung erfolgt. Zweckmäßig wird der O2-Sensor auf 8400C erhitzt. Diese Temperatur wird in der Meßkammer stabil gehalten. Aus der Anordnung der beiden Sensoren in der Meßkammer und der sich daraus ergebenden unmittelba-The known heating of the O 2 sensor has the advantage, when the CO sensor is arranged in the spatial vicinity of the sensor according to the invention, that a catalytic exothermic oxidation of CO to CO 2 takes place at the CO sensor without additional heating. The O 2 sensor is expediently heated to 840 0 C. This temperature is kept stable in the measuring chamber. The arrangement of the two sensors in the measuring chamber and the resulting immediate
ren Messung im Meßmedium, im Rauchgas, ergibt sich der angestrebte Wegfall der das Rauchgas einer entfernten Meßstelle zuführenden Leitung. Kurz gesagt, es wird ohne Gasentnahme gemessen.The measurement in the measuring medium, the flue gas, results in the desired elimination of the pipe that supplies the flue gas to a remote measuring point. In short, the measurement is carried out without gas extraction.
Wegen des Wegfalls der Leitung ergibt sich auch eine verzögerungsfreie Messung. Zu beachten ist, daß die beiden Sensoren durch die Meßkammer und das gasdurchlässige Filter staubfrei gehalten werden. Das Filter ist so ausgebildet, daß es zwar das Rauchgas, aber nicht den in diesem enthaltenen Staub durchläßt. Zweckmäßig ist es ein Diffusions-Filterelement.Because there is no cable, the measurement is also instantaneous. It is important to note that the two sensors are kept free of dust by the measuring chamber and the gas-permeable filter. The filter is designed in such a way that it lets the flue gas through, but not the dust it contains. It is best to use a diffusion filter element.
Zusammenfassend gesagt, ermöglicht die Erfindung die unmittelbare verzögerungsfreie und staubfreie Messung von sowohl O2 als auch CO unmittelbar im Meßmedium. Die Erfindung führt damit zu der ersten „in situ" arbeitenden Meßsonde. In summary, the invention enables the immediate, delay-free and dust-free measurement of both O 2 and CO directly in the measuring medium. The invention thus leads to the first "in situ" working measuring probe.
Am Beispiel der in der Zeichnung gezeigten Ausführungsform wird die Erfindung weiter beschrieben.The invention is further described using the example of the embodiment shown in the drawing.
Die Zeichnung zeigt das in den Rauchgaskanal hineinragende Meßsondenrohr 1. Der Rauchgaskanal befindet sich links von dem runden Flansch 2. Mit diesem ist das Meßsondenrohr 1 an der Wand des Rauchgaskanals befestigt. Das Meßrohr setzt sich fort in der zylindrischen Meßkammer 3. An seinem in der Zeichnung links liegenden und in den Rauchgaskanal hineinragenden Ende befindet sich das gasdurchlässige Filter 4. Der vorzugsweise auf 8400C temperierte O2-Sensor 5 und der CO-Sensor 6 sind in der Meßkammer 3 angeordnet. Rechts vom Flansch 2 und damit außerhalb des Rauchgaskanals befindet sich der Anschlußkasten 7. Über elektrische Leitungen ist die Meßkammer 3 bzw. sind die Sensoren 5 und 6 mit diesem verbunden.The drawing shows the measuring probe tube 1 protruding into the flue gas duct. The flue gas duct is located to the left of the round flange 2. This is used to attach the measuring probe tube 1 to the wall of the flue gas duct. The measuring tube continues into the cylindrical measuring chamber 3. At its end, which is on the left in the drawing and protrudes into the flue gas duct, is the gas-permeable filter 4. The O 2 sensor 5, which is preferably heated to 840 0 C, and the CO sensor 6 are arranged in the measuring chamber 3. To the right of the flange 2 and thus outside the flue gas duct is the connection box 7. The measuring chamber 3 and the sensors 5 and 6 are connected to it via electrical cables.
Der O2-Sensor 5 und der CO-Sensor 6 erzeugen auf bekannte Weise elektrische Signale in Abhängigkeit des von ihnen gemessenen O2- und CO-Anteils im Rauchgas. Diese elektrischen Signale werden dem Anschlußkasten 7 über elektrische Leitungen zugeführt. Der Anschlußkasten 7 enthält die Soft- und Hardware zum Auswerten der Signale. Er zeigt zeitgleich den O2- und CO-Anteil auf die gewünschte Weise, analog, digital usw., an.The O 2 sensor 5 and the CO sensor 6 generate electrical signals in a known manner depending on the O 2 and CO content in the flue gas that they measure. These electrical signals are fed to the connection box 7 via electrical lines. The connection box 7 contains the software and hardware for evaluating the signals. It simultaneously displays the O 2 and CO content in the desired manner, analogue, digital, etc.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE20200373U DE20200373U1 (en) | 2002-01-11 | 2002-01-11 | Measuring probe for measuring O2 and CO in flue gases |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE20200373U DE20200373U1 (en) | 2002-01-11 | 2002-01-11 | Measuring probe for measuring O2 and CO in flue gases |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE20200373U1 true DE20200373U1 (en) | 2002-05-02 |
Family
ID=7966462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE20200373U Expired - Lifetime DE20200373U1 (en) | 2002-01-11 | 2002-01-11 | Measuring probe for measuring O2 and CO in flue gases |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE20200373U1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT6701U3 (en) * | 2003-11-25 | 2004-07-26 | Avl List Gmbh | MEASURING DEVICE, PREFERRED A TEST STAND FOR ENGINES AND VEHICLES, FOR ANALYZING EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE |
| DE202013103647U1 (en) | 2013-08-12 | 2013-09-02 | Aspect Imaging Ltd. | A system for online measurement and control of O2 fraction, CO fraction and CO2 fraction |
| EP2300748B1 (en) | 2008-04-22 | 2016-10-26 | Basf Se | Method for controlling the addition of an additional fuel |
-
2002
- 2002-01-11 DE DE20200373U patent/DE20200373U1/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT6701U3 (en) * | 2003-11-25 | 2004-07-26 | Avl List Gmbh | MEASURING DEVICE, PREFERRED A TEST STAND FOR ENGINES AND VEHICLES, FOR ANALYZING EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE |
| US7637144B2 (en) | 2003-11-25 | 2009-12-29 | Avl List Gmbh | Measuring device, preferably a test stand for engines and vehicles for analyzing exhaust gases of a combustion engine |
| EP2300748B1 (en) | 2008-04-22 | 2016-10-26 | Basf Se | Method for controlling the addition of an additional fuel |
| DE202013103647U1 (en) | 2013-08-12 | 2013-09-02 | Aspect Imaging Ltd. | A system for online measurement and control of O2 fraction, CO fraction and CO2 fraction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R207 | Utility model specification |
Effective date: 20020606 |
|
| R081 | Change of applicant/patentee |
Owner name: ENOTEC GMBH, PROZESS- UND UMWELTMESSTECHNIK, DE Free format text: FORMER OWNER: ENOTEC GMBH, 51709 MARIENHEIDE, DE Effective date: 20040407 |
|
| R150 | Utility model maintained after payment of first maintenance fee after three years |
Effective date: 20050217 |
|
| R151 | Utility model maintained after payment of second maintenance fee after six years |
Effective date: 20080404 |
|
| R152 | Utility model maintained after payment of third maintenance fee after eight years |
Effective date: 20100407 |
|
| R071 | Expiry of right | ||
| R071 | Expiry of right |