DE9201533U1 - Arrangement for measuring a dust-laden gas flow - Google Patents
Arrangement for measuring a dust-laden gas flowInfo
- Publication number
- DE9201533U1 DE9201533U1 DE9201533U DE9201533U DE9201533U1 DE 9201533 U1 DE9201533 U1 DE 9201533U1 DE 9201533 U DE9201533 U DE 9201533U DE 9201533 U DE9201533 U DE 9201533U DE 9201533 U1 DE9201533 U1 DE 9201533U1
- Authority
- DE
- Germany
- Prior art keywords
- gas flow
- ultrasonic transducer
- measuring
- dust
- arrangement
- 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
- 238000002604 ultrasonography Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 9
- 239000000428 dust Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 however Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Description
92 G 3 O * 2 DE92 G 3 O * 2 EN
Siemens AktiengesellschaftSiemens AG
Anordnung zur Messung eines staubbeladenen Gasstromes 5Arrangement for measuring a dust-laden gas flow 5
Die Verbesserung betrifft eine Anordnung zur Messung eines Gasstromes in einer Rohrleitung mit einem Ultraschall-Wandler, der in einem rohrförmigen, an der Wand der Rohrleitung schräg in Gegenrichtung zur vorgesehenen Gasströmung angesetzten Halterungsteil gehalten ist und der mit dem Gas direkt in Berührung steht, wobei der Innenraum zwischen dem Ultraschall-Wandler und dem Gasstrom durchgehend ist und zwischen beiden eine ungehinderte Ultraschall-Ausbreitung zuläßt.The improvement relates to an arrangement for measuring a gas flow in a pipeline with an ultrasonic transducer, which is held in a tubular mounting part attached to the wall of the pipeline at an angle in the opposite direction to the intended gas flow and which is in direct contact with the gas, whereby the interior space between the ultrasonic transducer and the gas flow is continuous and allows unhindered ultrasound propagation between the two.
Derartige Anordnungen zur Ultraschall-Durchflußmessung gehören zum Stand der Technik (siehe Industrie-Elektrik und Elektronik, 25. Jahrgang, 1980, Nr. 23, Seite 750 - 752). Bei Messung von Strömen staubhaltigen Gases können sich jedoch auf den Ultraschall-Wandlern Staubschichten ablagern, was zu Nullpunktsverschiebungen und damit zu merklichen Meßfehlern, insbesondere bei kleinen Strömungsgeschwindigkeiten, führt. Um dies zu vermeiden, kann der mitgeführte Staub vor dem Einlaß des Meßkanals ausgefiltert werden. Bei großen zurückgehaltenen Staubmengen steigt jedoch der Druckverlust durch Zusetzen des Filters an. Bei Verzicht auf ein Staubfilter muß verhindert werden, daß Staub in direkten Kontakt mit der Wandlerfront kommt.Such arrangements for ultrasonic flow measurement are state of the art (see Industrial Electrics and Electronics, 25th year, 1980, No. 23, pages 750 - 752). When measuring flows of dust-containing gas, however, layers of dust can build up on the ultrasonic transducers, which leads to zero point shifts and thus to noticeable measurement errors, especially at low flow velocities. To avoid this, the dust carried along can be filtered out before the inlet of the measuring channel. However, if large amounts of dust are retained, the pressure loss increases due to clogging of the filter. If a dust filter is not used, dust must be prevented from coming into direct contact with the front of the transducer.
Daher liegt der Verbesserung die Aufgabe zugrunde, eine An-Ordnung der obigen Art zu schaffen, die unter Vermeidung der obengenannten Nachteile Strömungsmessungen von staubbeladenen Gasen ermöglicht. Dies wird bei der genannten Anordnung dadurch erreicht, daß das Halterungsteil längs der vorgesehenen Ultraschall-Richtung rückwärtig verlängert ist und daß der Ultraschall-Wandler im rückwärtig verlängerten Bereich des Halterungsteils gehalten ist, ohne den zur Leitung des zu messenden Gasstromes vorgesehenen Meßkanal zu berühren. GemäßThe improvement is therefore based on the task of creating an arrangement of the above type which enables flow measurements of dust-laden gases while avoiding the above-mentioned disadvantages. This is achieved in the above-mentioned arrangement in that the mounting part is extended backwards along the intended ultrasound direction and that the ultrasound transducer is held in the rearwardly extended area of the mounting part without touching the measuring channel intended for conducting the gas flow to be measured. According to
92 G 3 O hl OE92 G 3 O hl OE
einer besonders vorteilhaften und wirksamen Ausgestaltung der verbesserten Anordnung ist der Ultraschall-Wandler soweit zurückgesetzt, daß er sich außerhalb des fiktiven Raumes befindet, der sich senkrecht zur gedachten Verbindungsfläche zwisehen dem Meßkanal und dem Innenraum des Halterungsteil erstreckt. In a particularly advantageous and effective embodiment of the improved arrangement, the ultrasonic transducer is set back so far that it is located outside the fictitious space that extends perpendicular to the imaginary connecting surface between the measuring channel and the interior of the mounting part.
Im folgenden wird anhand der Zeichnung eine Ausführungsform der Verbesserung im einzelnen erläutert. 10In the following, an embodiment of the improvement is explained in detail using the drawing. 10
Die Zeichnung zeigt eine Rohrleitung 1, durch deren Meßkanal 4 der zu messende Gasstrom fließt. Von außen ist schräg auf die Rohrleitung 1 ein Halterungsteil 3 aufgesetzt, in welchem ein Ultraschall-Wandler 2 gehalten ist. Dabei ist der Ultraschall-Wandler 2 gegenüber dem Meßkanal 4 zurückversetzt, d.h. er berührt diesen nicht. Durch diese Maßnahme wird die Tasche zwischen dem Ultraschall-Wandler 2 und der Strömungszone vergrößert. In diesem durch Zurückversetzung des Ultraschall-Wandlers 2 entstehenden Totvolumen geht die Strömungsgeschwindigkeit gegen Null, so daß kein Staub die Wandlerfront beaufschlagen kann. Bereits ein Versatz von 10 mm gegenüber der bisherigen Ultraschall-Wandler-Halterung, bei der der Ultraschall-Wandler die Strömungszone berührt, reicht aus, um eine Staubkontamination des Ultraschall-Wandlers 2 zu verhindern. Auf die Flußlinearität wirkt sich der zurückversetzte Einbau des Ultraschall-Wandler nur geringfügig aus. Der Signalverlust durch Abschaltung hält sich, wie Untersuchungen bestätigt haben, in akzeptablen Grenzen. Er beträgt bei einem Versatz von 10 mm etwa 3 dB und bei einem Versatz von 20 mm etwa 6 dB.The drawing shows a pipe 1 through whose measuring channel 4 the gas flow to be measured flows. From the outside, a bracket 3 is placed diagonally on the pipe 1, in which an ultrasonic transducer 2 is held. The ultrasonic transducer 2 is set back from the measuring channel 4, i.e. it does not touch it. This measure enlarges the pocket between the ultrasonic transducer 2 and the flow zone. In this dead volume created by setting the ultrasonic transducer 2 back, the flow speed approaches zero, so that no dust can hit the front of the transducer. An offset of just 10 mm compared to the previous ultrasonic transducer bracket, where the ultrasonic transducer touches the flow zone, is enough to prevent dust contamination of the ultrasonic transducer 2. The set-back installation of the ultrasonic transducer only has a minor effect on the flow linearity. The signal loss due to shutdown is, as tests have confirmed, within acceptable limits. It is about 3 dB for an offset of 10 mm and about 6 dB for an offset of 20 mm.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9201533U DE9201533U1 (en) | 1992-02-07 | 1992-02-07 | Arrangement for measuring a dust-laden gas flow |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9201533U DE9201533U1 (en) | 1992-02-07 | 1992-02-07 | Arrangement for measuring a dust-laden gas flow |
Publications (1)
Publication Number | Publication Date |
---|---|
DE9201533U1 true DE9201533U1 (en) | 1992-04-02 |
Family
ID=6875878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE9201533U Expired - Lifetime DE9201533U1 (en) | 1992-02-07 | 1992-02-07 | Arrangement for measuring a dust-laden gas flow |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE9201533U1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19727960A1 (en) * | 1997-07-01 | 1999-02-04 | Peus Systems Gmbh | System for timed high resolution measuring of volume flows of gaseous medium in pipe |
DE102004060118A1 (en) * | 2004-12-13 | 2006-06-14 | Endress + Hauser Flowtec Ag | Device for determining and / or monitoring volume and / or mass flow |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3409595A1 (en) * | 1984-03-15 | 1985-09-19 | Micro Pure Systems, Inc., Smithfield, R.I. | Method and device for identifying discontinuities in a flow |
-
1992
- 1992-02-07 DE DE9201533U patent/DE9201533U1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3409595A1 (en) * | 1984-03-15 | 1985-09-19 | Micro Pure Systems, Inc., Smithfield, R.I. | Method and device for identifying discontinuities in a flow |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19727960A1 (en) * | 1997-07-01 | 1999-02-04 | Peus Systems Gmbh | System for timed high resolution measuring of volume flows of gaseous medium in pipe |
DE19727960C2 (en) * | 1997-07-01 | 1999-10-14 | Peus Systems Gmbh | Device for the temporally high-resolution measurement of a gaseous volume flow, in particular an exhaust gas volume flow of an internal combustion engine, in a pipe through which it flows |
DE102004060118A1 (en) * | 2004-12-13 | 2006-06-14 | Endress + Hauser Flowtec Ag | Device for determining and / or monitoring volume and / or mass flow |
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