EP3370877A1 - Broyeur pendulaire perfectionné - Google Patents
Broyeur pendulaire perfectionnéInfo
- Publication number
- EP3370877A1 EP3370877A1 EP16806255.2A EP16806255A EP3370877A1 EP 3370877 A1 EP3370877 A1 EP 3370877A1 EP 16806255 A EP16806255 A EP 16806255A EP 3370877 A1 EP3370877 A1 EP 3370877A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- enclosure
- central shaft
- mill
- hand
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 claims abstract description 26
- 230000006835 compression Effects 0.000 claims abstract description 5
- 238000007906 compression Methods 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims abstract description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 4
- 239000011707 mineral Substances 0.000 claims abstract description 4
- 238000005461 lubrication Methods 0.000 claims description 16
- 238000012423 maintenance Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 2
- 238000013022 venting Methods 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 13
- 239000002245 particle Substances 0.000 description 10
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000002006 petroleum coke Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000001033 granulometry Methods 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/02—Centrifugal pendulum-type mills
Definitions
- the present invention relates to a grinding mill for reducing to fine powder according to a predefined granulometry, various materials, mineral and / or organic, such as limestone, sulphates, clinker, clays, coal, petroleum coke, pozzolans , salts, oxides, biomass, etc.
- the mill of the invention is of the pendular type, that is to say that it works by compression of the raw mineral matter to be ground, by fracturing the latter in a chamber, to constitute what is called a "Material bed", the fine powder being evacuated from the top of the enclosure, thanks to a stream of gas.
- pebbles a grinding ring of vertical axis and at least two rolling masses on the ring, called pebbles. These are mounted to rotate each on a vertical shaft designated pendulum rod articulated at its free end, on a central structure called "star".
- the roller assembly and pendulum rod is designated by the term pendulum.
- the central shaft is rotated by a motor through a gearbox, both located outside the mill chamber under the base (bottom). Furthermore, the central shaft is held and guided in rotation by means of a vertical hollow column, fixed on the base (the bottom) of the mill. There is provided a pivot connection between the column and the central shaft, inside the enclosure of the mill.
- shares intended to scrape the material which has been deposited on the bottom of the mill.
- the coulters are rotated around the shaft by means of a skirt attached thereto.
- the shares are intended to feed the bed of material.
- the gases are at room temperature.
- certain materials need to be cooled by the supply of cold gas.
- the gas stream at the base of the mill causes the particles of finer material to suspend, after grinding by the rollers and the removal of these particles from the top of the mill.
- Fine particles are then treated downstream by a system called separator for sorting by particle size.
- the finished product according to the particle size is discharged to the outside, while the rejected particles, as being outside the desired size criteria, fall by gravity to the base of the mill, to feed the bed of material or are extracted from the grinding chamber by a handling means.
- a handling means It is understood that the enclosure of the mill where these operations are performed, is a very dusty environment and therefore abrasive. The phenomenon of abrasion is all the more important given the many moving parts inside the crusher.
- lubricating means by oil circulation, for each connection of two movable elements relative to each other, and in particular at the pivot connection between the central shaft and the column.
- the lubrication of the pivot connection between the rollers and their pendulum rod is ensured by means of sparging in an oil bath, protected from dust and its abrasive effect, either by a sealed mechanical system, or by a hydraulic system. injection of air between the clocks and their pebble.
- the invention therefore aims to solve these difficulties, and proposes a pendulum mill in which the circulation of oil on the one hand and air on the other hand does not require the production of complicated and therefore expensive parts, which allows a balanced airflow to each pendulum, which is simpler in design, and therefore less expensive and easier to maintain.
- the compressive compression mill for reducing to a fine powder various materials, of the type comprising:
- pendulums each comprising a roller rotatably mounted on a pendulum rod
- star a system of connection between the central shaft and the pendulums designated star.
- the star is fixed by a rigid connection on the central shaft and by pivot connection means between each pendulum, to allow the rolling along a circular path of the rollers on the inner face of the ring, so as to allow the crushing of the materials located between the rollers and the inner wall of the ring;
- the means for supporting and maintaining the central shaft are located outside the internal environment of the enclosure which is dusty and therefore abrasive, and therefore easily accessible for repair or maintenance operations. Air circulation to protect lubrication systems is made simpler, and therefore more efficient.
- the means for supporting and holding the central shaft include means for driving the central shaft, and more specifically in the form of a rotary hearth associated with a speed reduction assembly, itself associated with the driving means of the central shaft, said sole thus ensuring both the transmission of the rotation of the motor, and the support and guiding of the central shaft.
- a cylindrical cover through which the central shaft passes, and preferably the cover is constituted firstly by a cylindrical sleeve, and secondly by a cover having a central hole at through which the central tree passes.
- the device includes gas venting means for creating a gas stream at the base within the enclosure.
- the gas is heated to between about 150 and 400.
- the device advantageously comprises at least two rollers uniformly distributed angularly around the central shaft.
- the number of pebbles can be three, four, or even exceed four on large grinders and reach five or six. At a minimum, two rollers are needed to ensure a balanced set.
- the device comprises scraping shares, secured to the lower part of the central shaft by arms, and intended to scrape the bottom of the enclosure.
- connection system between pendulums on the one hand and the central shaft on the other hand, in the form of arms arranged in a star.
- This linking system is designated star.
- the device comprises lubrication means at the connections between the moving parts, and there is provided air circulation means for the protection of the latter.
- Figure 1 shows a diagram seen in section along a vertical plane of a pendulum mill of the prior art
- Figure 2 shows a schematic sectional view along a vertical plane of the pendulum mill of the invention
- FIG. 3 shows a sectional view similar to FIG. 2 showing the whole of the mill of the invention, including the rotating hearth, the base of the enclosure, the cylindrical hood and the plowing shares, and the circulation of air.
- the qualifiers "superior”, “lower”, “high”, “low”, “tangential”, “radial”, “transverse” of a mill element are used. in the context of a normal installation of the latter, that is to say relating to a vertical concept with respect to a flat horizontal floor on which the grinder would be placed.
- a pendulum mill comprising a hollow cylindrical enclosure 1 having a vertical longitudinal axis XX, comprising a cylindrical wall 2 and a horizontal bottom 3 delimiting a lower volume.
- basic 4 a pendulum mill according to the prior art is described below, comprising a hollow cylindrical enclosure 1 having a vertical longitudinal axis XX, comprising a cylindrical wall 2 and a horizontal bottom 3 delimiting a lower volume.
- the cylindrical wall 2 of the enclosure is provided with a ring-shaped reinforced portion 5.
- the bottom 3 has a central opening 3A.
- a hollow central column 6, coaxial with the axis X-X, is provided in the chamber, and whose base 6A is fixed on the bottom 3, sealingly at the central opening 3A of the bottom.
- the mill further comprises a vertical central shaft 7, coaxial with the X-X axis, passing through the column 6, protruding in the upper part of the latter, and projecting downwards from the central opening 3A of the bottom 3.
- the central shaft 7 is rotatably mounted (arrow "f") and for this purpose is:
- each pendulum rod (opposite each link pivot) is rotatably mounted on a mass or roller 18, 19 of generally cylindrical shape and able to turn on itself (arrows "g” and “h”), along the vertical axis defined by their pendulum rod16, respectively 17.
- Each pair of rollers (18, 19) / pendulum rod (16, 17) forms a kind of pendulum.
- the assembly formed by the central shaft 7, the pendulum rods 16 and 17, the radial arms 12 and 13, and the rollers 18, 19, thus form a kind of carousel.
- the duct 20 conveys material or raw materials to treat (arrow "i") in the enclosure.
- the mill may comprise more than two pendulums (each pendulum comprises a pendulum rod and associated roller), evenly distributed angularly around the shaft. Arms Radials 12 and 13 (between the shaft 7 and the pendulum rods 16, 17) form a kind of star with as many branches as pebbles.
- a skirt 22 covers the central column 6 and surrounds it.
- the disk is traversed by and associated around the central shaft 7;
- a lower conical portion 22C flared downward (near the bottom 3).
- the skirt 22 is secured to the shaft 7 at the upper disk 22B, and is rotated by the latter (arrow "j").
- the shares are intended to scrape (by their lower side) the material which has been deposited on the bottom 3 of the mill.
- the coulters 23 and 24 are intended to feed the bed of material on the bottom.
- a ventilation system blowing a gas stream at the base of the mill, through a conduit 25 opening into the lower part 4 of the enclosure.
- the flow of gas is heated to a temperature of the order of 150-400 ⁇ .
- the gas stream (arrow “k") causes the suspension of the finer material particles, after grinding by the rollers and the evacuation (arrow "I") of these particles from the top of the mill. Fine particles are then treated downstream by a system called separator for sorting by particle size.
- the separator is of the known type and is not shown for reasons of clarity.
- the finished product conforms to the grain size is discharged to the outside, while the rejected particles, as being outside the desired size criteria, fall by gravity to the base of the mill, to feed the bed of material and be crushed again or are extracted from the grinding chamber by a handling means.
- lubrication means are provided at the joints and drives of moving parts, and in a known manner.
- the mill comprises the following lubrication means, which are not represented for the sake of clarity, and which are known in themselves:
- the pivot connection respectively 14 and 15, between the respective pendular rods 16 and 17, and the radial arms 12 and 13, is associated with the seal system, which is either a seal of a flexible and elastic deformable material, or by a device mechanical requiring lubrication; any known joint can be used.
- each pendulum rod 16 and 17, and the corresponding roller 18, 19, to allow the latter to turn on themselves is also provided with lubrication means known in themselves, bubbling in a bath of oil.
- the connection between the central column 6, fixed, and the rotating shaft 7, is also equipped with lubrication means of the known type with oil circulation.
- the lubrication systems are protected from the dusty environment and therefore abrasive inside the mill enclosure, either by a mechanical sealing element, or preferably by an air injection system between the rod pendulum and the corresponding roller, and between the column and the tree.
- the invention remedies by proposing a mill described below with reference to FIGS. 2 to 3.
- the mill of the invention according to FIG. 2 is distinguished in particular from that of the prior art (FIG. 1) by the rotation drive and the maintenance of the shaft 7. Other differences will appear from the description which follows. In particular, there is the absence of the skirt 22 on the one hand, and the central column 6 of the mill on the other hand, with respect to the mill of the prior art.
- the shaft 7 is, according to the invention, on the one hand held vertical, and on the other hand rotated on itself (arrow "f"), by specific means comprising a rotary hearth 26 outside the enclosure, associated with and disposed in a speed reducing assembly 10A, itself connected to the motor 9.
- the rotating hearth 26 is rotatably mounted in a fixed pivot 26A disposed in the gear 10A, the length of which depends on the size of the grinders.
- the gearbox sized to support the assembly in rotation, is itself fixed on a rigid outer support, for example embedded in the mass of a massive civil engineering provided for this purpose.
- the sole 26 thus ensures both the transmission of the rotation of the motor, and the support and guiding of the shaft 7.
- the shaft is associated with a rigid coupling 27 whose role is to transmit the torque of the engine by filtering the vibrations.
- the bottom 3 of the enclosure is open in its central part, on a portion of diameter between 50 and 100 cm, which depends on the size of the grinders sufficient to ensure the passage of air at low speed around the shaft 7 (the diameter of the opening is a few centimeters greater than the diameter of the shaft 7).
- the central opening 29 is associated with a cylindrical hood, through which the shaft 7 passes.
- the hood is constituted firstly of a fixed cylindrical sleeve 28 and secondly of a lid rotating 29 having a central hole through which the shaft 7 tightly.
- the lid 29 is integral with the shaft 7.
- the scrapers 23 and 24 are rigidly connected to the shaft 7 by radial arms 30 and 31.
- the gear as well as the rotating assembly are aligned at the mounting (for example by known alignment tools) to ensure good concentricity between the rotating elements and the following fixed parts:
- the means for supporting and maintaining the shaft are located outside the internal environment of the enclosure which is dusty and therefore abrasive.
- the maintenance of the drive means is facilitated, and thus reduces the intervention time, and thus the downtime of the mill with the savings that result.
- the mill can be used in so-called "direct" mode for solid fuels (coal, petroleum coke, biomass etc.), in which the crushed fuel is injected under pressure, evacuated from the enclosure by ventilation, and conveyed directly into the plant.
- the combustion means the nozzle type, burner, etc.
- This clean air circuit is fed by a labyrinth running via an annular nurse located under the bottom 3 and feeding the central shaft 7 (hollow shaft).
- the labyrinth travels in the central shaft 7 to the arms 12-13 and the pivots 14-15 to the pendulum rods 16-17 to seal (to the dusty environment of the enclosure) by a principle of air seal of the pivot located between the pendulum rods 16-17 and their roller 18-19.
- the gearbox 10B comprises firstly a vertical pivot 26A in which is mounted rotatably the rotary hearth 26, and secondly a rotary drive, for example with a bevel gear 32 including a pinion 32A, which depends on the gear used, is connected to the motor not shown and known in itself.
- a protection circuit intended to protect the internal lubrication means of the clocks
- a second air circuit called a guiding circuit, producing an air seal intended to prevent the ground material from escaping outside the mill.
- the first and second air circuits are respectively connected upstream to a source of clean air, which can be common, not shown and known in itself.
- a source of clean air which can be common, not shown and known in itself.
- chambers and air flow ducts described below.
- the first guide circuit comprises an annular chamber 33 disposed above the rigid coupling system 27, collinearly with the central shaft 7, and located at the base thereof.
- the chamber 33 has an inlet or opening 33A, connected to a source of clean air.
- the air enters the annular chamber 33, symbolized by the arrow "m”.
- the base of the hollow central shaft 7 is provided with one or more openings 34 through which the air of the chamber 33 (arrows "n” and "o") enters the interior of the central shaft to rise inside it (arrow "p").
- the air circulating in this first circuit ensures the protection of the internal lubrication means.
- the second guiding circuit comprises an annular chamber 35, disposed just above the annular chamber 33 of the first protective air circuit, and collinearly with the central shaft 7.
- the chamber 35 is located at the base of the the tree.
- the chamber 35 has an inlet or opening 35A, connected to a source of clean air.
- the air enters the annular chamber 35, symbolized by the arrow "k”, and is evacuated (arrows "K1" and “K2") through the central opening 300 at the base of the bottom 3, to enter the space annular delimited by the annular wall 28 (integral with the bottom 3) and the cover 29 (integral with the rotating central shaft).
- the air is then discharged (arrows k2, k3, K4 and k5) by the gap between the wall 28 and the lid 29.
- the second air circuit thus seals between the cylindrical sleeve 28 and the cover 29, producing an air seal, preventing the particles in the bottom of the mill from leaving the mill chamber between the fixed annular wall. 28 and the rotating lid 29.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1560611A FR3043342B1 (fr) | 2015-11-05 | 2015-11-05 | Broyeur pendulaire perfectionne |
PCT/FR2016/052877 WO2017077258A1 (fr) | 2015-11-05 | 2016-11-07 | Broyeur pendulaire perfectionne |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3370877A1 true EP3370877A1 (fr) | 2018-09-12 |
EP3370877B1 EP3370877B1 (fr) | 2022-08-03 |
Family
ID=55300533
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16806255.2A Active EP3370877B1 (fr) | 2015-11-05 | 2016-11-07 | Broyeur pendulaire perfectionné |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3370877B1 (fr) |
ES (1) | ES2929108T3 (fr) |
FR (1) | FR3043342B1 (fr) |
WO (1) | WO2017077258A1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB187959A (en) * | 1921-10-27 | 1924-01-16 | Francois Adrien Pellissier | Improvements in or relating to pulverizers |
CH558678A (de) * | 1973-03-14 | 1975-02-14 | Eirich Gustav Maschinenfabrik | Mit ueberkritischer drehzahl arbeitende muehle und verfahren zu ihrem betrieb. |
DE102009000442B4 (de) * | 2009-01-27 | 2011-04-07 | Neuman & Esser Gmbh Mahl- Und Sichtsysteme | Getriebelose Pendelmühle |
JP5650085B2 (ja) * | 2011-10-03 | 2015-01-07 | 田村 允孝 | ロールミル |
-
2015
- 2015-11-05 FR FR1560611A patent/FR3043342B1/fr active Active
-
2016
- 2016-11-07 WO PCT/FR2016/052877 patent/WO2017077258A1/fr active Application Filing
- 2016-11-07 EP EP16806255.2A patent/EP3370877B1/fr active Active
- 2016-11-07 ES ES16806255T patent/ES2929108T3/es active Active
Also Published As
Publication number | Publication date |
---|---|
FR3043342A1 (fr) | 2017-05-12 |
WO2017077258A1 (fr) | 2017-05-11 |
FR3043342B1 (fr) | 2021-12-10 |
EP3370877B1 (fr) | 2022-08-03 |
ES2929108T3 (es) | 2022-11-24 |
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