WO2001012998A1 - A method of reducing particle build-up on a surface located within a recess of a conduit carrying particulate material - Google Patents
A method of reducing particle build-up on a surface located within a recess of a conduit carrying particulate material Download PDFInfo
- Publication number
- WO2001012998A1 WO2001012998A1 PCT/AU2000/000958 AU0000958W WO0112998A1 WO 2001012998 A1 WO2001012998 A1 WO 2001012998A1 AU 0000958 W AU0000958 W AU 0000958W WO 0112998 A1 WO0112998 A1 WO 0112998A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recess
- gas
- conduit
- housing
- velocity
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/12—Cleaning arrangements; Filters
-
- 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
-
- 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
-
- 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
- G01F1/74—Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
Definitions
- the present invention relates to a method of reducing particle build-up on a surface recessed from a conduit carrying particles of a solid entrained in a gas.
- Solid materials in particulate form are conveyed pneumatically in a range of industries. Cement raw materials and finished product can be conveyed pneumatically. Similarly, coal is commonly conveyed pneumatically to burners in power station boilers. In the coal fired boilers of the type used to generate electricity, coal is pulverised in grinding mills and transported by heated primary air pipes to individual burners contained within a plurality of similar burners that comprise the burner of a boiler. Maldistribution of fuel across the burner fuel supply pipes has detrimental effects on boiler performance. Fuel rich areas lead to high levels of unburnt carbon in fly ash and fuel lean areas can lead to high levels of NO x . In order to improve the efficiency of boiler performance, it is necessary to monitor the mass flow rate of coal within the burner supply pipes .
- transducers of the type disclosed in the specification of US Patent No. 4882934 can only be replaced if the conduit is taken out of service. Since coal conveying conduits are usually higher in pressure than atmospheric, removal of a transducer from an in-service conduit carrying coal would lead to substantial leakage of particulate coal from the conduit.
- the present invention provides a method of reducing particle build-up on a surface recessed from a conduit carrying particles of a solid entrained in a gas, the method including blowing gas into a recess containing the surface at high volume and low velocity so that gas entering the recess flows in a substantially laminar manner.
- the present invention also provides a housing for attachment to a conduit, the housing defining a recess when attached to the conduit in which a device such as an ultrasonic transducer can be mounted and including first inlet means for introducing gas into the recess in such a way that the gas flows at high volume and low velocity in a laminar manner across a face of the device located in the recess.
- the housing may also include second inlet means for introducing gas at high pressure and high velocity into the recess.
- Gas introduced into the recess via the first inlet permits the face of the device located in the recess to remain free of particulate build-up. It also can be used to cool the device.
- the high pressure inlet permits devices to be changed whilst the conduit is in service.
- the invention allows compressed gas to be delivered in two different ways:
- the way in which air is delivered to the face of the device may be critical to its performance. Taking an ultrasonic transducer as an example, delivering a high velocity jet of air onto the face of the transducer cleans the face but reduces the efficiency of the ultrasonic beam transmitted or received by the transducer as a result of turbulence.
- the present invention permits the face of the ultrasonic transducer to remain free of particulate matter whilst minimising the disturbance of the ultrasonic transmission.
- gas is preferably introduced into the recess via a calming chamber that reduces the velocity of the incoming gas to that at which laminar flow prevails.
- Figure 1 is a cross- sectional view of a transducer mounted within a recess according to the invention.
- Figure 1 depicts an annular mounting pad 1 located on the wall of a conduit (not shown) .
- the mounting pad 1 is welded onto the conduit over a hole which has been previously cut or drilled in the conduit.
- a housing 2 is secured to the mounting pad 1 by means of bolts 3.
- the housing 2 defines a recess 4.
- An ultrasonic transducer 5 is mounted within the recess 4 by means of bolts 6 that secure a base plate 7 to the housing 2.
- the ultrasonic transducer 5 comprises a ceramic element 8 having a polyurethane cover and a transducer capsule 9 secured to a swivel rod 10 by means of bolts 11.
- the swivel rod 10 passes through a swivel ball 12 mounted between base plate 7 and ball swivel mounting plate 13.
- Ball swivel mounting plate 13 is connected to base plate 7 by means of adjustable screws 14.
- Swivel rod 10 passes through a bore in base plate 7, ball swivel 12 and ball swivel mounting plate 13 and terminates in an adjusting handle 25.
- the handle 25 incorporates a standard BNC connector 15. Two thin wires run from the ceramic element 8 to the BNC connector 15. An electronic signal fed to the connector 15 activates the ultrasonic transducer.
- a cover 16 is secured to the housing 2 by means of bolts 17.
- a flexible dust shield 18 is attached to the base plate 7 and engages the circumference of the swivel rod 10. Flexible dust shield 18 is preferably made from a suitable elastomer such as butyl -rubber.
- the housing 2 includes an annular calming chamber
- Air inlets 20 are located within chamber 21 defined by chamber wall 19 and flange 22. Flange 22 located within chamber 21 prevents direct entry of air into recess 4 and distributes the air around annular chamber 21. Air bleeds out of the annular chamber 21 into recess 4 via a circumferential entry port 26.
- the volume of the chamber 21 is approximately 1.5 times the volume of recess 4.
- the housing 2 includes a single high pressure line 23 having an inlet 24 directed outwardly from the recess away from the face of the transducer.
- Adjustable screws 14 may be used to swivel transducer 5 through an arc of 5° about the ball swivel 12.
- the flexible dust shield 18 restricts access of abrasive particulate material to the ball swivel 12 thereby ensuring longer service .
- air may flow out of chamber 21 at a rate in a range from 80 to 300 litres/minute, which corresponds to an air flow velocity out of recess 4 of 0.2 to 3.6 metres/second.
- a flow of 150 litres/minute will maintain the transducer free of particle build-up.
- air flowing out of chamber 21 is directed across the face of the transducer from all directions around the circumference rf. the transducer face. Upon introduction to the recess 4, the air begins to change direction towards the outlet from recess 4 and ultimately leaves recess 4 travelling in a direction that is substantially parallel to the longitudinal axis of recess 4.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
- Air Transport Of Granular Materials (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002380874A CA2380874A1 (en) | 1999-08-11 | 2000-08-11 | A method of reducing particle build-up on a surface located within a recess of a conduit carrying particulate material |
EP00951103A EP1206645A4 (en) | 1999-08-11 | 2000-08-11 | A method of reducing particle build-up on a surface located within a recess of a conduit carrying particulate material |
JP2001517062A JP2003507283A (en) | 1999-08-11 | 2000-08-11 | Method for reducing laminated particles on concave surface of particulate matter transport pipe |
AU64159/00A AU776963B2 (en) | 1999-08-11 | 2000-08-11 | A method of reducing particle build-up on a surface located within a recess of a conduit carrying particulate material |
US10/048,774 US6817251B1 (en) | 1999-08-11 | 2000-08-11 | Method of reducing particle build-up on a surface located within a recess of a conduit carrying particulate material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPQ2155 | 1999-08-11 | ||
AUPQ2155A AUPQ215599A0 (en) | 1999-08-11 | 1999-08-11 | A method of reducing particle build-up on a surface located within a recess of a conduit carrying particulate material |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001012998A1 true WO2001012998A1 (en) | 2001-02-22 |
Family
ID=3816333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2000/000958 WO2001012998A1 (en) | 1999-08-11 | 2000-08-11 | A method of reducing particle build-up on a surface located within a recess of a conduit carrying particulate material |
Country Status (6)
Country | Link |
---|---|
US (1) | US6817251B1 (en) |
EP (1) | EP1206645A4 (en) |
JP (1) | JP2003507283A (en) |
AU (1) | AUPQ215599A0 (en) |
CA (1) | CA2380874A1 (en) |
WO (1) | WO2001012998A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1770378A2 (en) * | 2005-09-29 | 2007-04-04 | Miele & Cie. KG | Device for measuring the metered quantity of rinsing additives |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009032908B4 (en) * | 2009-07-10 | 2013-06-13 | Reinhausen Plasma Gmbh | Method and device for conveying and distributing powders |
US20120279308A1 (en) * | 2011-05-04 | 2012-11-08 | Fbs, Inc. | Elastic wave rail defect detection system |
EP2763847A4 (en) | 2011-10-07 | 2015-08-19 | Boral Ip Holdings Australia Pty Ltd | Inorganic polymer/organic polymer composites and methods of making same |
US8864901B2 (en) | 2011-11-30 | 2014-10-21 | Boral Ip Holdings (Australia) Pty Limited | Calcium sulfoaluminate cement-containing inorganic polymer compositions and methods of making same |
CN113340386B (en) * | 2021-07-06 | 2022-06-03 | 山东三维海容科技有限公司 | Quality detection method for transmission bottle of pneumatic logistics transmission system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1406951A (en) * | 1972-05-22 | 1975-09-17 | Crown Zellerbach Corp | Structure for transporting fluid-entrainable material |
US4982610A (en) * | 1989-08-25 | 1991-01-08 | Libbey-Owens-Ford Co. | Device for measuring the flow of a gas containing particulates |
JPH11166720A (en) * | 1997-12-04 | 1999-06-22 | Gastar Corp | Dust trap assembly |
DE19800573A1 (en) * | 1998-01-09 | 1999-07-15 | Bosch Gmbh Robert | Unit for measuring mass flow rate of air into engine inlet manifold |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4882934A (en) * | 1986-03-12 | 1989-11-28 | Charles B. Leffert | Ultrasonic instrument to measure the gas velocity and/or the solids loading in a flowing gas stream |
AU639054B2 (en) * | 1989-12-12 | 1993-07-15 | Commonwealth Scientific And Industrial Research Organisation | Ultrasonic mass flow meter |
US5277070A (en) * | 1991-08-01 | 1994-01-11 | Xecutek Corporation | Ultrasonic gas flow measurement method and apparatus |
US5864067A (en) * | 1994-06-17 | 1999-01-26 | Schlumberger Industries, S.A. | Fluidic oscillator and a method of measuring a volume-related quantity of fluid flowing through such a fluidic oscillator |
-
1999
- 1999-08-11 AU AUPQ2155A patent/AUPQ215599A0/en not_active Abandoned
-
2000
- 2000-08-11 JP JP2001517062A patent/JP2003507283A/en not_active Withdrawn
- 2000-08-11 WO PCT/AU2000/000958 patent/WO2001012998A1/en not_active Application Discontinuation
- 2000-08-11 CA CA002380874A patent/CA2380874A1/en not_active Abandoned
- 2000-08-11 US US10/048,774 patent/US6817251B1/en not_active Expired - Fee Related
- 2000-08-11 EP EP00951103A patent/EP1206645A4/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1406951A (en) * | 1972-05-22 | 1975-09-17 | Crown Zellerbach Corp | Structure for transporting fluid-entrainable material |
US4982610A (en) * | 1989-08-25 | 1991-01-08 | Libbey-Owens-Ford Co. | Device for measuring the flow of a gas containing particulates |
JPH11166720A (en) * | 1997-12-04 | 1999-06-22 | Gastar Corp | Dust trap assembly |
DE19800573A1 (en) * | 1998-01-09 | 1999-07-15 | Bosch Gmbh Robert | Unit for measuring mass flow rate of air into engine inlet manifold |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Derwent World Patents Index; Class Q73, AN 1999-413540/35 * |
See also references of EP1206645A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1770378A2 (en) * | 2005-09-29 | 2007-04-04 | Miele & Cie. KG | Device for measuring the metered quantity of rinsing additives |
EP1770378A3 (en) * | 2005-09-29 | 2007-12-19 | Miele & Cie. KG | Device for measuring the metered quantity of rinsing additives |
Also Published As
Publication number | Publication date |
---|---|
AUPQ215599A0 (en) | 1999-09-02 |
CA2380874A1 (en) | 2001-02-22 |
EP1206645A1 (en) | 2002-05-22 |
EP1206645A4 (en) | 2006-06-21 |
US6817251B1 (en) | 2004-11-16 |
JP2003507283A (en) | 2003-02-25 |
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