WO1999037565A1 - Method and plant for pneumatic transport of solid particles - Google Patents
Method and plant for pneumatic transport of solid particles Download PDFInfo
- Publication number
- WO1999037565A1 WO1999037565A1 PCT/SE1998/002424 SE9802424W WO9937565A1 WO 1999037565 A1 WO1999037565 A1 WO 1999037565A1 SE 9802424 W SE9802424 W SE 9802424W WO 9937565 A1 WO9937565 A1 WO 9937565A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- velocity
- transport air
- air
- pressurised
- transport
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002245 particle Substances 0.000 title claims abstract description 17
- 239000007787 solid Substances 0.000 title claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 28
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000001419 dependent effect Effects 0.000 claims description 4
- 239000003570 air Substances 0.000 description 24
- 238000005265 energy consumption Methods 0.000 description 4
- 239000013590 bulk material Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 239000012080 ambient air Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
Definitions
- the invention relates to a method of transporting solid particles pneumatically, as defined in the preamble of the accompanying independent method Claims .
- the invention also relates to corresponding plant of the kind defined in the preamble of the accompanying dependent apparatus Claim.
- the transportation of solid particles, such as wood chips, for instance, through a tubular conduit with the aid of a pressurized gas flow, particularly a compressed-air flow, is well known to the art.
- the plant is dimensioned so that the source of pressurised- air will generate a specific air velocity in the conduit at a chosen maximum load on the system.
- the plant is dimensioned on the basis of the density of the bulk material (which in the case of wood chips will depend on the type of wood concerned and its moisture content) , the concentration of the bulk material, and particle size distribution (chips, bark, etc.).
- the source of pressurised-air is normally referred to as a blower, i.e. a positive displacement compressor, which is operated at a constant speed.
- one object of the present invention is to pro- vide a method and plant which enable the energy consumption of the system to be restricted when the system is operated with a varying material load. Another object is to provide a simple method of adjustment which enables this reduction in energy consumption to be achieved. Another object is to provide simple means by means of which the pressurised-air source can be adjusted to enable said reduction in energy consumption to be achieved.
- the pressure can be measured readily and safely in the transport conduit and is dependent on the material load. Consequently, it is not necessary to measure the varying amount of material fed into the conduit.
- a simple relationship can be established between the free flow from said 3 pressurised-air source and the detected/sensed pressure under certain conditions, such that the velocity of the transporting air will be constant with respect to different occurring material loads.
- the free flow from said pressurised-air source is proportional to the rotary speed of a positive displacement blower used as said source.
- the rotary speed of the blower corresponds to the driving frequency of an asynchronous motor used to operate the blower. This frequency can easily be sensed. The frequency can also readily be controlled with the aid of a converter. It is also possible to establish the relationship between the frequency and control pressure, or set-point pressure, in the conduit. A control pressure can thus be calculated on the basis of the frequency sensed/detected and the frequency then adjusted to correspond to the control pressure.
- Fig. 1 is a schematic illustration of an inventive plant
- Fig. 2 illustrates the relationship between pressure and frequency.
- the plant includes a conduit 1 in which solid particles move in the direction of arrow 23.
- the conduit includes an infeed device 2 for the infeed of solid particles 21 to be trans- ported in the direction of flow 23.
- a source of pressurised-air Arranged upstream of the infeed device is a source of pressurised-air which includes a blower 3, i.e. a compressor. Ambient air is allowed to enter the upstream end of the conduit 1, via a silencer 4.
- the blower 3 is a positive displacement blower and may comprise a screw compressor whose free flow is determined by the speed at which the screws rotate.
- the blower 3 is rotated by an 4 asynchronous motor 5. Current is supplied to the motor 5 from switch gear via a frequency converter 6 which supplies the motor 5 with a frequency controlled by a control system 7.
- the control system 7 receives information from one or more pressure sensors 8 arranged in the conduit 1 to sense the pressure in said conduit, preferably in the region between the blower 3 and the material infeed device 2.
- the volume of material delivered to the system via the infeed device 2 defines a load level. In the case of the illustrated embodiment, the velocity of the air moving through the conduit system is kept constant for the different load levels that occur.
- the blower inlet pressure pi is set for instance to 101.3 kPA (normal air pressure) .
- Vi will keep v2 as the velocity for which the system was once designed, e.g. a velocity of 33 m/sec. The following values are applicable to the system:
- the rotary speed of the asynchronous motor may generally vary in the range of (1.0:0.5) times its normal speed, i.e. the frequency can vary from 25-50 Hz since the switch gear normally delivers 50 Hz. The minimum frequency of 25 Hz is then determined with regard to safety against thermal fatigue and storage currents in respect of the asynchronous motor.
- An important feature of the invention is that the air velocity in the conduit can be kept constant without needing to measure the velocity directly and without needing to measure the instantaneous material load on the system.
- this flow can be easily controlled, by setting the asynchronous motor to a corresponding operating frequency, said control frequency being calculated on the basis of the pressure control value determined.
- the parameters Floff and dl are used to adjust a p-f relationship which lies closer to, e.g., the "true curve" or a drift which is better from some other aspect.
- An alternative to the aforedescribed regulating method is one in which an attempt is made to detect or sense the air velocity in the conduit 1 directly and to adjust the blower to maintain this air velocity even when the material loaded via the infeed device 2 falls beneath the maximum value for which the chosen transport velocity has been selected.
- the velocity of the air in the conduit 2 can also be determined by measuring temperature changes of the air, i.e. by measuring the temperature of the air upstream and downstream of the blower.
- the drive motor of the blower is an asynchronous motor, so that the blower inlet velocity will be directly proportional to said frequency. It will be understood, however, that the pressurised- air source may have a different form.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Transport Of Granular Materials (AREA)
- Fertilizers (AREA)
- Manufacturing Of Micro-Capsules (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69813628T DE69813628T2 (en) | 1998-01-09 | 1998-12-22 | METHOD AND SYSTEM FOR PNEUMATICALLY CONVEYING SOLID PARTICLES |
AT98965343T ATE237546T1 (en) | 1998-01-09 | 1998-12-22 | METHOD AND SYSTEM FOR PNEUMATIC CONVEYING SOLID PARTICLES |
JP2000528499A JP4206483B2 (en) | 1998-01-09 | 1998-12-22 | Method and plant for pneumatic transport of solid particles |
US09/581,540 US6447215B1 (en) | 1998-01-09 | 1998-12-22 | Method and plant for pneumatic transport of solid particles |
CA002318404A CA2318404C (en) | 1998-01-09 | 1998-12-22 | Method and plant for pneumatic transport of solid particles |
AU20818/99A AU2081899A (en) | 1998-01-09 | 1998-12-22 | Method and plant for pneumatic transport of solid particles |
EP98965343A EP1060115B1 (en) | 1998-01-09 | 1998-12-22 | Method and plant for pneumatic transport of solid particles |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9800033A SE510507C2 (en) | 1998-01-09 | 1998-01-09 | Method and plant for pneumatic transport of solid particles |
SE9800033-4 | 1998-01-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999037565A1 true WO1999037565A1 (en) | 1999-07-29 |
Family
ID=20409822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1998/002424 WO1999037565A1 (en) | 1998-01-09 | 1998-12-22 | Method and plant for pneumatic transport of solid particles |
Country Status (10)
Country | Link |
---|---|
US (1) | US6447215B1 (en) |
EP (1) | EP1060115B1 (en) |
JP (1) | JP4206483B2 (en) |
AT (1) | ATE237546T1 (en) |
AU (1) | AU2081899A (en) |
CA (1) | CA2318404C (en) |
DE (1) | DE69813628T2 (en) |
ES (1) | ES2197523T3 (en) |
SE (1) | SE510507C2 (en) |
WO (1) | WO1999037565A1 (en) |
Cited By (4)
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WO2001019711A1 (en) * | 1999-09-10 | 2001-03-22 | Waeschle Gmbh | Method and device for the pneumatic transport of bulk goods |
EP1348652A3 (en) * | 2002-03-27 | 2007-04-04 | Nisshin Seifun Group Inc. | Powdery particle conveying system and roots blower operating method |
WO2011020132A1 (en) * | 2009-08-20 | 2011-02-24 | Wittmann Kunststoffgeräte Gmbh | Method for automatically loading a feed line with bulk material |
CN106185329A (en) * | 2015-06-01 | 2016-12-07 | 谢雷克斯公司 | Device and system for pneumatic transportation material |
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US6827528B1 (en) * | 2003-12-27 | 2004-12-07 | Arkadi Relin | Method of dynamic transporting of object with flow of carrying medium |
US7278804B2 (en) * | 2005-10-07 | 2007-10-09 | Hi-Plains Trading Company | Methods and systems for delivering lost circulation material into drilling pits |
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ITVR20070083A1 (en) * | 2007-06-12 | 2008-12-13 | Moretto Spa | PLANT FOR PNEUMATIC TRANSPORT AT CONTROLLED SPEED OF GRANULAR MATERIAL AND PROCEDURE FOR THE CONTROL OF CONVEYANCE SPEED |
US8573896B2 (en) * | 2007-10-17 | 2013-11-05 | Remco International, Inc. | Method of dynamic energy-saving superconductive transporting of medium flow |
EP2254818A1 (en) * | 2008-01-28 | 2010-12-01 | Johann Haberl | Tubing conduit system, a method for control thereof and the use thereof |
US9731914B2 (en) * | 2008-11-06 | 2017-08-15 | Michael J. Rasner | Pneumatic convey system with constant velocity pickup |
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US10202835B2 (en) * | 2014-01-16 | 2019-02-12 | Halliburton Energy Services, Inc. | Pressure delivery proppant to offshore frac blender |
US10175701B2 (en) | 2014-02-20 | 2019-01-08 | Stephen B. Maguire | Air flow regulator with detector and method for regulating air flow |
US10179708B2 (en) | 2014-02-20 | 2019-01-15 | Maguire Products, Inc. | Granular material delivery system with air flow limiter |
US20160185537A1 (en) * | 2014-02-20 | 2016-06-30 | Novatec, Inc. | Resin delivery method and apparatus using multiple sensors for optimal vacuum pump operation |
US10138075B2 (en) * | 2016-10-06 | 2018-11-27 | Stephen B. Maguire | Tower configuration gravimetric blender |
US10414083B2 (en) | 2014-02-20 | 2019-09-17 | Novatec, Inc. | Multiple sensor resin delivery optimizing vacuum pump operation |
US10280015B2 (en) | 2014-02-20 | 2019-05-07 | Stephen B. Maguire | Method for adjustably restricting air flow and apparatus therefor |
US9937651B2 (en) | 2014-02-20 | 2018-04-10 | Novatec, Inc. | Resin delivery apparatus and method with plural air flow limiters |
US10144598B2 (en) * | 2014-02-20 | 2018-12-04 | Novatec, Inc. | Variable frequency drive combined with flow limiter set for limiting flow to selected level above design choice |
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US10131506B2 (en) | 2014-12-09 | 2018-11-20 | Maguire Products, Inc. | Selective matrix conveyance apparatus and methods for granular resin material |
US10179696B2 (en) | 2015-01-27 | 2019-01-15 | Novatec, Inc. | Variable opening slide gate for regulating material flow into airstream |
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US10138076B2 (en) * | 2015-02-25 | 2018-11-27 | Stephen B. Maguire | Method for resin delivery including metering introduction of external air to maintain desired vacuum level |
US9745149B2 (en) * | 2015-03-19 | 2017-08-29 | Ipeg, Inc. | Material delivery system |
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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DE2319028A1 (en) * | 1972-04-14 | 1973-11-08 | Burton On Trent Engineering Lt | Loose material dispenser - esp for feeding hops pellets into brewing vats |
GB1428498A (en) * | 1973-07-06 | 1976-03-17 | Waeschle Maschf Gmbh | Method and apparatus for pneumatically conveying material |
US3979152A (en) * | 1974-11-22 | 1976-09-07 | Morbark Industries, Inc. | Particulate material handling apparatus |
GB2038750A (en) * | 1978-12-29 | 1980-07-30 | Gen Resource Corp | Method of and apparatus for conveying particulate material |
GB2089307A (en) * | 1980-11-26 | 1982-06-23 | Texaide Ltd | Apparatus for conveying a fluid and/or a fluid-borne material including a translucent pipe and associated light source |
EP0427881A1 (en) * | 1989-11-13 | 1991-05-22 | Fritz Werner Industrie-Ausrüstungen GmbH | Method and device for controlling the volumetric stream of an air suction conveying installation |
EP0653366A2 (en) * | 1993-11-15 | 1995-05-17 | ZEPPELIN SCHÜTTGUTTECHNIK GmbH | Method of and device for cleaning conveyor pipelines by blowing |
US5618136A (en) * | 1995-08-04 | 1997-04-08 | Smoot Co. | Dual blower railcar discharge and conveyor system and method |
Family Cites Families (10)
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US4009912A (en) * | 1974-11-04 | 1977-03-01 | Joseph Mraz | Pneumatic conveying apparatus and method |
US4502819A (en) * | 1981-06-12 | 1985-03-05 | Denka Engineering Kabushiki Kaisha | Constant discharge device in a conveyor for powdery and granular materials |
SE458924B (en) * | 1985-01-28 | 1989-05-22 | Abb Stal Ab | TRANSPORTING DEVICE FOR PNEUMATIC TRANSPORTATION WITH PRESSURE REDUCING BODY INCLUDING STRIP |
US4662799A (en) * | 1985-05-17 | 1987-05-05 | Fuller Company | Apparatus and process for pneumatically conveying particulate material |
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US4938637A (en) * | 1989-06-09 | 1990-07-03 | Lybecker G Wayne | Method and apparatus for bottom loading a pneumatic transport pressure vessel |
US5247722A (en) * | 1990-02-22 | 1993-09-28 | Trutzschler Gmbh & Co. Kg | Method and apparatus for pneumatically introducing fiber to a fiber processing machine |
US5201877A (en) * | 1992-04-24 | 1993-04-13 | Arkadi Relin | Suction transporting device |
SE506007C2 (en) * | 1993-12-20 | 1997-11-03 | Evac Ab | Vacuum drainage system with ejector |
DE19622191A1 (en) * | 1996-06-03 | 1997-12-04 | Bayer Ag | Method and device for contamination-free metering and conveying of solid powders to be dispersed or dissolved |
-
1998
- 1998-01-09 SE SE9800033A patent/SE510507C2/en not_active IP Right Cessation
- 1998-12-22 DE DE69813628T patent/DE69813628T2/en not_active Expired - Lifetime
- 1998-12-22 US US09/581,540 patent/US6447215B1/en not_active Expired - Fee Related
- 1998-12-22 JP JP2000528499A patent/JP4206483B2/en not_active Expired - Fee Related
- 1998-12-22 WO PCT/SE1998/002424 patent/WO1999037565A1/en active IP Right Grant
- 1998-12-22 AU AU20818/99A patent/AU2081899A/en not_active Abandoned
- 1998-12-22 ES ES98965343T patent/ES2197523T3/en not_active Expired - Lifetime
- 1998-12-22 AT AT98965343T patent/ATE237546T1/en active
- 1998-12-22 CA CA002318404A patent/CA2318404C/en not_active Expired - Fee Related
- 1998-12-22 EP EP98965343A patent/EP1060115B1/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2319028A1 (en) * | 1972-04-14 | 1973-11-08 | Burton On Trent Engineering Lt | Loose material dispenser - esp for feeding hops pellets into brewing vats |
GB1428498A (en) * | 1973-07-06 | 1976-03-17 | Waeschle Maschf Gmbh | Method and apparatus for pneumatically conveying material |
US3979152A (en) * | 1974-11-22 | 1976-09-07 | Morbark Industries, Inc. | Particulate material handling apparatus |
GB2038750A (en) * | 1978-12-29 | 1980-07-30 | Gen Resource Corp | Method of and apparatus for conveying particulate material |
GB2089307A (en) * | 1980-11-26 | 1982-06-23 | Texaide Ltd | Apparatus for conveying a fluid and/or a fluid-borne material including a translucent pipe and associated light source |
EP0427881A1 (en) * | 1989-11-13 | 1991-05-22 | Fritz Werner Industrie-Ausrüstungen GmbH | Method and device for controlling the volumetric stream of an air suction conveying installation |
EP0653366A2 (en) * | 1993-11-15 | 1995-05-17 | ZEPPELIN SCHÜTTGUTTECHNIK GmbH | Method of and device for cleaning conveyor pipelines by blowing |
US5618136A (en) * | 1995-08-04 | 1997-04-08 | Smoot Co. | Dual blower railcar discharge and conveyor system and method |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001019711A1 (en) * | 1999-09-10 | 2001-03-22 | Waeschle Gmbh | Method and device for the pneumatic transport of bulk goods |
EP1348652A3 (en) * | 2002-03-27 | 2007-04-04 | Nisshin Seifun Group Inc. | Powdery particle conveying system and roots blower operating method |
WO2011020132A1 (en) * | 2009-08-20 | 2011-02-24 | Wittmann Kunststoffgeräte Gmbh | Method for automatically loading a feed line with bulk material |
US9061842B2 (en) | 2009-08-20 | 2015-06-23 | Wittmann Kunststoffgeraete Gmbh | Method for automatically loading a feed line with bulk material |
CN106185329A (en) * | 2015-06-01 | 2016-12-07 | 谢雷克斯公司 | Device and system for pneumatic transportation material |
Also Published As
Publication number | Publication date |
---|---|
ATE237546T1 (en) | 2003-05-15 |
CA2318404A1 (en) | 1999-07-29 |
JP2002500997A (en) | 2002-01-15 |
SE9800033D0 (en) | 1998-01-09 |
JP4206483B2 (en) | 2009-01-14 |
EP1060115B1 (en) | 2003-04-16 |
ES2197523T3 (en) | 2004-01-01 |
AU2081899A (en) | 1999-08-09 |
SE9800033L (en) | 1999-05-31 |
DE69813628D1 (en) | 2003-05-22 |
EP1060115A1 (en) | 2000-12-20 |
US6447215B1 (en) | 2002-09-10 |
DE69813628T2 (en) | 2004-02-26 |
CA2318404C (en) | 2007-02-13 |
SE510507C2 (en) | 1999-05-31 |
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