EP1144286A2 - Method and device for pneumatically conveying bulk material - Google Patents
Method and device for pneumatically conveying bulk materialInfo
- Publication number
- EP1144286A2 EP1144286A2 EP00935200A EP00935200A EP1144286A2 EP 1144286 A2 EP1144286 A2 EP 1144286A2 EP 00935200 A EP00935200 A EP 00935200A EP 00935200 A EP00935200 A EP 00935200A EP 1144286 A2 EP1144286 A2 EP 1144286A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- line section
- bulk material
- sectional area
- conveying
- bulk
- 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.)
- Withdrawn
Links
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
- B65G53/52—Adaptations of pipes or tubes
- B65G53/525—Adaptations of pipes or tubes for conveyance in plug-form
Definitions
- the invention relates to a method for the pneumatic conveying of bulk material from a low to a higher level, the bulk material first being conveyed essentially horizontally, then being pneumatically raised and subsequently pneumatically conveyed further, and a device suitable for carrying out the method.
- a generic conveying method for bulk material is known from the document EP 0 268 101 A1.
- the bulk material is fed from a container into the lower, horizontal section of a pneumatic conveying line, subsequently diverted into a vertical line section and raised to the level of an upper, also horizontally running line section.
- the first two sections have the same pipe cross-sectional area (apart from a partial widening in the vertical line section), while the upper section is provided with a gradually increasing pipe cross-sectional area.
- the bulk material is accelerated as it enters the lower line section and is transported in the form of a continuous flow of bulk material at a high conveying speed until the upper section is reached.
- the speed decreases to such an extent that the bulk material flow forms discrete bulk material plugs, which are conveyed to a receiving container at slow speed.
- a conveying method belonging to the state of the art in which the bulk material in the form of individual bulk material plugs is raised from a feed vessel via a horizontal line section, a sloping section and a again horizontally running line section and conveyed to a receiving container.
- the bulk material enters from a strand-like outlet opening into an upwardly directed pipe socket, which ends in a likewise horizontally running delivery line, via a bottom-side outlet opening.
- the onward transport takes place again in the form of a dense phase flow.
- the horizontal conveying lines are aligned, so that the bulk material is not raised to a higher level.
- the object of the present invention is to promote bulk goods in a product-friendly manner and largely avoiding shock loads over great distances from a low to a higher level.
- the object is achieved in that the first, essentially horizontal conveying takes place in the form of discrete bulk plugs spaced by gas cushions and the lifting of the bulk material takes place in the form of a largely continuous flow of bulk material.
- the deflection of the bulk material flow is therefore essentially bumpless, so that the use of mechanically particularly resilient pipeline bearings, support structures and silo reinforcements is avoided.
- the conveying capacity can be increased or the conveying distance can be extended.
- Each horizontally conveyed, discrete bulk material plug is caught in a bulk material depot and temporarily accumulated before lifting, according to a special embodiment of the invention.
- the average load can be kept constant at least from the first horizontal conveying to the end of lifting.
- the conveying gas speed during the lifting is preferably between 7.5 m / s and 30 m / s, in particular approximately 10 to 20 m / s.
- the first, essentially horizontal line section has a larger cross-sectional area than the subsequent second line section, in which the bulk material is raised to the level of the third line section.
- the cross-sectional area of the second line section is preferably between 20% and 85% of the cross-sectional area of the first line cross section.
- a condition converter in the form of a collecting device for bulk material plugs is arranged, which can be designed, for example, as a cyclone or pipe extension.
- the latter is preferred inclined downwards with respect to the first line section and opens into a pipe bend pointing upwards in a siphon-like manner.
- the cross-sectional area in the third line section can also be selected to be larger than that of the first line section in order to compensate for the increase in the gas volume flow due to the expansion of the conveying gas, so that the same conveying speed as in the first line section is established.
- Fig. 1 shows an inventive system for performing the method
- Fig. 2 is a state diagram of the pneumatic delivery showing the delivery pressure ⁇ p and the delivery gas velocity v e
- the system shown in FIG. 1 for the pneumatic conveyance of bulk material for example plastic granules, comprises a storage container 1 from which the bulk material is continuously fed into a conveyor line 4 by means of a sluice device 2 in the form of a cellular wheel sluice 3. There, the bulk material is captured by a conveying gas flow, which is provided by a compressor 5 in connection with a downstream air quantity control 6.
- the bulk material is conveyed via a first, comparatively long and essentially horizontal line section 7a to the vicinity of a receiving container 8, raised to a level above the roof 9 of the receiving container 8 by means of a subsequent, second vertical line section 7b. and fed to the receiving container 8 via a third line section 7c, which runs again horizontally, and an arcuate line section 7d.
- the pneumatic conveying takes place in the form of discrete bulk plugs 9, 9 ' , which are spaced apart from the conveying gas by gas cushions 10, 10 ' .
- bulk material deposits can form in the lower region of the first line section 7a, which slightly reduce the free cross section of the delivery line 4.
- the length of the first line section 7a is at least 50%, but preferably over 80% of the total length of the delivery line 4, which is usually between 100 m and 1000 m long.
- the bulk material plugs 9, 9 ' move through the first line section 7a at high delivery pressure at low speed.
- This stable conveying state can be found on the left-hand side of the state diagram shown in FIG. 2 and is marked with the letter "A". This conveying is gentle on the product, so that only a small amount of dust-like product abrasion occurs.
- compact bulk material plugs can occur when deflected 9, 9 ' high impact forces occur, for example when they enter the subsequent second vertical line section 7b.
- a state converter 11 which is gas-tight except for the inlet and outlet opening for the bulk material flow, and which consists of a container in the cylindrical region, provided with an outlet funnel in the lower region, into which the delivery line enters tangentially through the cylinder jacket surface.
- the volume of the collecting device 16a is dimensioned such that each plug of bulk material 9, 9 'dissolves when it emerges from the first line section 7a due to the release of the conveying gas and is subsequently collected in a bulk material depot 17.
- the state converter 11 is preferably located at the transition from the horizontal to the vertical conveyor path, but can also be arranged at a short distance upstream of this transition. In the latter case, however, there is an increased risk of undesirable abrasion.
- the outlet funnel of the collecting device 16a is followed at the bottom by an upwardly directed pipe bend 14a and subsequently by a second line section 7b, the line cross section of which is reduced in comparison with the cross section of the first line section 7a in such a way that it becomes more unstable following the collecting device 16a Funding conditions a stable strand promotion "B" or flight promotion "C” sets.
- the inner pipe diameter of the second line section 7b is 162.3 mm (DN 150).
- the reduced line cross section is maintained in the pipe bend 14a, the subsequent second line section 7b, for example 10 m to 50 m long, and at least in the pipe bend 14b to which the third line section 7c is connected.
- the deflection of the continuous bulk material flow 12 is largely free of bumps, the generation of abrasion in the comparatively short, narrowed areas of the delivery line 4 being negligible.
- a conveying gas speed of 7.5 m / s to 30 m / s, preferably about 10 m / s for the strand conveyance “B” or 20 m / s for a flight conveyance “C” is to be set.
- the speed of the bulk material particles is about 70% of the conveying gas speed.
- the continuous conveying up to the receiving container 8 can be maintained.
- the horizontal third line section 7c therefore has the same cross-sectional area as the vertical second line section 7b, and is therefore also designed in DN 150. If the delivery line 4 is assigned several receptacles in series, the required switches can be designed in a smaller size in accordance with the reduced cross-sectional area of the third line section 7c.
- the conveyor system according to FIG. 3 differs from the above-described device in the type of infeed device 2, in which the bulk goods are fed in with the aid of two pressure vessels 15, 15 ' arranged in parallel and alternately feeding the delivery line 4.
- the bulk material is conveyed in the form of discrete bulk material plugs 9, 9 ' through a first line section 7a with a large cross-sectional area up to a condition converter 11 in the form of a downwardly inclined collecting device 16b which forms a tube extension, in which the bulk material plugs 9, 9 ' are collected by collecting Bulk material depot 17 trains.
- the collecting device 16b is in turn followed by an upwardly directed, siphon-like pipe bend 14a, the cross-sectional area of which is reduced in such a way that a continuous bulk material flow in the form of a strand conveyance "B" or slow flight conveyance "C” is formed when leaving the condition converter 11 second line section 7b and in the subsequent pipe bend 14b is maintained.
- the diameter of the collecting device 16b can be, for example, twice the diameter of the circular first line section 7a.
- One or more swirl pieces 20 can be arranged in the second line section 7b, which concentrate the flow in a swirl strand and thus improve the continuity of the bubble layer conveyance. This measure is particularly useful in the transition between the pipe bend 14a and the second line section 7b.
- the cross-sectional area following the pipe bend 14b is enlarged again by means of a conically widening transition piece 13, so that the conveying speed in the third line section 7c is reduced.
- the conveying state “A” is then set again, so that the bulk material is again gently conveyed in the form of discrete bulk material plugs 9 ′′ , 9 ′ ′′ to the receiving container 8. If, however, the third line section 7c is relatively short, the cross section of the second line section 7b Maintained to the destination or even a cross-sectional reduction can be made in the third line section 7c.
- differently designed vessels can of course also be used as state changers 11, provided that their volume and the position and size of the inlet opening 18 and outlet opening 19 dissolve the incoming bulk material plugs 9, 9 ' and the exit of an essentially continuous one , smoothly deflectable bulk material flow 12 is secured. It is permissible that the State converter 11 briefly completely emptied until it picks up the next bulk plug 9, 9 ' and converts it again into a continuous bulk material stream 12. In this way, backflow of the bulk material into the first line section 7a and thus an abrupt deceleration of the incoming bulk material plug 9, 9 'are reliably avoided. A regulation of the bulk material feed depending on the fill level of the state converter 11 can thus be dispensed with.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Transport Of Granular Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999130281 DE19930281A1 (en) | 1999-07-01 | 1999-07-01 | Method and device for the pneumatic conveying of bulk material |
DE19930281 | 1999-07-01 | ||
PCT/EP2000/005368 WO2001002274A2 (en) | 1999-07-01 | 2000-06-10 | Method and device for pneumatically conveying bulk material |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1144286A2 true EP1144286A2 (en) | 2001-10-17 |
EP1144286A3 EP1144286A3 (en) | 2002-09-04 |
Family
ID=7913263
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00935200A Withdrawn EP1144286A3 (en) | 1999-07-01 | 2000-06-10 | Method and device for pneumatically conveying bulk material |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1144286A3 (en) |
DE (1) | DE19930281A1 (en) |
WO (1) | WO2001002274A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102837969B (en) * | 2011-06-20 | 2015-01-14 | 通用电气公司 | Flow pattern converting tube and pneumatic transmission system |
DE202018101651U1 (en) | 2018-03-16 | 2018-04-09 | Seepex Gmbh | Plant for conveying pasty material |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2936807A1 (en) * | 1979-09-12 | 1981-04-02 | Ruhrkohle Ag, 4300 Essen | Pneumatic mine backfilling conveyor system - has intermediate drive unit in blower duct between delivery and discharge positions |
JP2512449B2 (en) * | 1986-10-21 | 1996-07-03 | 協和醗酵工業株式会社 | High-concentration pneumatic transportation method and apparatus for granular material |
DE3813551A1 (en) * | 1988-03-17 | 1989-09-28 | Brieden Karl Bau Beteiligung | Apparatus for steep-incline conveying of construction material in underground operation |
DE19503383C2 (en) * | 1995-02-02 | 1998-05-14 | Waeschle Maschf Gmbh | Process for the shock-reduced pneumatic plug conveying of bulk goods and device for carrying out the process |
DE19521766A1 (en) * | 1995-06-19 | 1997-01-02 | Zeppelin Schuettguttech Gmbh | Method of releasing blockages of bulk goods in pneumatic conveyors |
-
1999
- 1999-07-01 DE DE1999130281 patent/DE19930281A1/en not_active Ceased
-
2000
- 2000-06-10 WO PCT/EP2000/005368 patent/WO2001002274A2/en not_active Application Discontinuation
- 2000-06-10 EP EP00935200A patent/EP1144286A3/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO0102274A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE19930281A1 (en) | 2001-01-11 |
WO2001002274A2 (en) | 2001-01-11 |
EP1144286A3 (en) | 2002-09-04 |
WO2001002274A3 (en) | 2001-08-09 |
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