EP2517794A1 - Moulin à cylindres verticaux - Google Patents

Moulin à cylindres verticaux Download PDF

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Publication number
EP2517794A1
EP2517794A1 EP09852580A EP09852580A EP2517794A1 EP 2517794 A1 EP2517794 A1 EP 2517794A1 EP 09852580 A EP09852580 A EP 09852580A EP 09852580 A EP09852580 A EP 09852580A EP 2517794 A1 EP2517794 A1 EP 2517794A1
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EP
European Patent Office
Prior art keywords
roller
slit grooves
crushing
angled
rotation direction
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.)
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Application number
EP09852580A
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German (de)
English (en)
Inventor
Hajime Kawatsu
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ING Shoji Co Ltd
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ING Shoji Co Ltd
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Publication date
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Publication of EP2517794A1 publication Critical patent/EP2517794A1/fr
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    • 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
    • B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed
    • 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
    • B02C15/003—Shape or construction of discs or rings
    • 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
    • B02C15/004—Shape or construction of rollers or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/10—Pulverizing
    • F23K2201/1006—Mills adapted for use with furnaces

Definitions

  • the present invention relates to a vertical roller mill suitable for crushing coal or petroleum cokes used as a fuel in an electric-power generating boiler.
  • Electric-power generating boilers which still use coal or petroleum cokes as a fuel have been used often. This is because the fuel cost is low and electric-generating capacity adjustment is easy, and not only in China as a developing country, but also in Japan, the considerable part of electric-generating capacity depends on coal and petroleum cokes. However, coal and petroleum cokes have a great disadvantage that the amount of carbon dioxide emissions is large.
  • Japan has made a commitment toward the world to reduce 25% of the amount of carbon dioxide emissions in 1990 by 2020.
  • This commitment shows a very difficult numerical value for achievement in which Japanese people and industries need to take great responsibility, but because of having made the commitment, Japan must work toward the aim. For that, the reduction of the amount of carbon dioxide emissions from coal or petroleum cokes used in electric-power generating boilers also becomes a very important measure.
  • the present inventors have noted this earlier on to address the crushing measure in crushing mills, and have also achieved great results.
  • the representative technique is an improvement in roller crushing surface shapes, in particular, the development of a slit roller, described in Patent Documents 1 and 2.
  • slit roller slit grooves in the center line direction are formed at predetermined intervals in the perimeter direction on the outer circumference surface, as the crushing surface, of a grinding roller.
  • the blast furnace of a steelmaking plant which produces pig iron generates and uses a large amount of coke reducing gas for reducing and dissolving iron ores, but the cokes which are produced from expensive caking coal are very expensive, so that to reduce the amount of use thereof, inexpensive pulverized coal is blasted from the blast furnace tuyere to reduce the amount of coke consumption, thereby reducing the pig iron production cost.
  • a large number of slit rollers developed by the present inventors are adopted for blast furnace pulverized coal blasting equipment, thereby greatly contributing to the cost reduction. It is said that the cost reduction effect in a certain steelmaking plant achieves as much as 600 million to 700 million yen annually.
  • the production amount of fine particles including 200 mesh and under 200 mesh is increased by approximately 20% or more, as compared with the conventional mills, to increase the blast furnace combustion efficiency, thereby contributing to the further reduction of the amount of coke consumption.
  • the reduction of the amount of coke consumption also leads to the reduction of carbon dioxide emitted at the time of coke production, and makes a significant contribution to the reduction.
  • the vertical roller mill includes one driving table rotated horizontally, and a plurality of grinding rollers placed on the driving table so as to surround the rotation center line thereof, and conveys coal fed from the center of the mill onto the center portion of the table to the outside by centrifugal force to bite the coal between the rollers and the table, thereby subsequently crushing the coal.
  • the crushed coal is airflow-conveyed upward by a conveying airflow so as to be classified by a classifier, the coal having a necessary particle size is captured and conveyed to the later stage, and the coal having a larger particle size than that is returned to the inside of the mill again.
  • the vertical roller mill for crushing coal is divided broadly into a Loesche mill type in which grinding rollers are frusto-conical shaped and an annular crushing portion on the upper face of a rotary table has a horizontal plane and a tire type in which the outer circumference surfaces of grinding rollers are curved in the convex direction to the outer circumference side in a plane right-angled to the rotation direction and annular grooves of arcuate cross section into which the outer circumference surfaces of the grinding rollers are fitted are formed on the upper face of a rotary table.
  • the tire type grinding roller is further divided into two: a convex-shaped tire in which the ratio between the largest diameter D and the radius of curvature R in a plane right-angled to the rotation direction of the tire crushing surface is 4.3 or more and a flat-shaped tire in which the ratio is less than 4.3.
  • the present inventors also have developed a vertical roller mill which has slit grooves provided on both the outer circumference surfaces of grinding rollers which are the crushing portions of the grinding rollers and an annular crushing portion formed on the upper face of the outer circumference portion of a rotary table (Patent Document 3).
  • this vertical roller mill is very effective for crushing a raw material, like limestone, in which crushed fine particles are likely to adhere onto the surfaces of the rollers, in particular, for preventing vibration due to fine particle adherence in the crushing, it is not always effective for crushing coal or petroleum cokes.
  • An object of the present invention is to provide a vertical roller mill which is effective for making the crushing particle size in the crushing of coal or petroleum cokes finer.
  • the present inventors have examined a combination of the crushing surface shapes of the rotary table and the grinding roller in the vertical roller mill, and have studied appropriate combinations of both which can obtain finer particles than the conventional mills.
  • the vertical roller mill again only in view of the crushing of coal or petroleum cokes, in the vertical roller mill described in JP-A No.
  • the present inventors have provided slit grooves in both the grinding roller and the rotary table to sufficiently grasp the respective characteristics of the crushing surfaces of the roller and the table, thereby effectively using the characteristics of the crushing surfaces of both, and have succeeded in achieving further crushing of coal or petroleum cokes, which has not been able to obtain. Its process will be described below.
  • the present inventors have conducted the following experiment as the first step for searching for combinations of crushing surface shapes for obtaining finer particles, which can extract a large amount of fine particles passing under 200 mesh and under -235 mesh in coal crushing and can contribute to the reduction of the amount of carbon dioxide emissions.
  • This vertical roller mill is uneconomical because the grinding roller cannot be used reversely when it wears, but this vertical roller mill is excellent in performance as a coal crushing machine, and can be one of high-efficiency crushing machines.
  • the tire has a large radius shape and is flat, the difference between the tire diameter below the main crushing portion and the tire diameter above the main crushing portion is small, and there is no large difference between the circumference speeds, so that the power discharging coal crushed by the main crushing portion in the tire outside direction is low and high-efficiency crushing is hard to perform. Therefore, only the circumference surface of the small diameter portion becomes the main crushing portion, and when passing through this, crushing on other crushing surfaces cannot be performed effectively.
  • the main crushing portion of the real machine becomes the small diameter portion of the roller on the outer circumference side of the table, but, reversely, the main crushing portion of the experimenting machine becomes the small diameter portion on the inner circumference side of the table. It is assumed that this is because the crushing points are different due to the difference between the table rotation speeds. However, although the real machine and the experimenting machine have the main crushing portion in different positions, both of them perform crushing in the small diameter portion, so that the operation effect may be assumed to be the same.
  • the direction of the slit grooves provided on the roller is directed in the direction scraping coal fed from the center of the table in the small diameter portion direction again, and it is assumed that the angle is effectively an angle to 45° with reference to the direction right-angled to the rotation direction (right-angled slits).
  • the right-angled slit grooves in the radius direction right-angled to the rotation direction are formed on the rotary table, the synergistic effect of the crushing surfaces of both makes the biting of coal excessive, with the result that the coal layer thickness in the crushing chamber formed between the roller and the table is increased, so that the roller surface pressure is insufficient, thereby obtaining no fine particles.
  • the roller surface pressure is increased, the percentage finer by weight of fine particles is recovered, but the axial electricity is increased and the roller wears immediately.
  • the angle of the slit grooves provided on the table in the range of 0° to 45° in terms of an inclination angle with respect to the radius line right-angled to the rotation direction improves the performance of biting, so that it is determined that in view of providing the performance of coal movement and conveying, the angle is preferably above 45°, particularly preferably 50° to 85°.
  • the extraction amount of fine particles having a particle size under -235 mesh is increased.
  • the vertical roller mill of the present invention has been completed based on such findings, and includes a rotary table driven to rotate, and a plurality of grinding rollers including free rollers placed at fixed positions on the rotary table so as to surround the rotation center line of the rotary table to bite and crush a raw material to be ground between the rotary table and the grinding rollers with the rotary driving of the rotary table, wherein a plurality of oblique slit grooves inclined in the table rotation direction or the reverse rotation direction thereof with respect to the table radius line are provided at predetermined intervals in the perimeter direction on an annular crushing portion on the upper face of the rotary table, each of the oblique slit grooves being present in a region of the angle exceeding 45° to the radius line.
  • the right-angled slit grooves right-angled to the rotation direction or the oblique slit grooves having a small inclination angle with respect to this are provided on the grinding rollers, thereby increasing the performance of biting and crushing on the grinding roller side, so that high-order management of both the performance of biting and crushing and the performance of feed control of the raw material is enabled, and this is performed under the conditions specific to the kinds of the grinding rollers in the vertical roller mills, so that a high crushing effect can be obtained in any of the vertical roller mills.
  • each of the oblique slit grooves on the rotary table is placed in an interior angle region from a straight line inclined at 50° with respect to the table radius line (a straight line inclined at 40° with respect to the inner circle tangent line of the annular crushing portion) to the inner circle of the annular crushing portion.
  • the frusto-conical shaped roller As described above, as three kinds of grinding rollers in the vertical roller mill, there are the frusto-conical shaped roller, the flat-shaped roller which is the tire type roller and has D/R ⁇ 4.3, and the convex-shaped roller which is the tire type roller and has D/R ⁇ 4.3.
  • Loesche mill including, as the grinding roller, the frusto-conical shaped roller, the frusto-conical shaped roller having on the outer circumference surface thereof right-angled slit grooves parallel to a straight line right-angled to the roller rotation direction or oblique slit grooves inclined in the rotation direction or the reverse rotation direction at an angle of 22.5° or less with respect to the straight line, which is preferable in view of the crushing of coal or petroleum cokes.
  • the vertical roller mill including, as the grinding roller, the flat-shaped tire roller in which the outer circumference surface thereof is curved in a plane right-angled to the rotation direction and the ratio D/R between the largest roller diameter D and the radius of curvature R of the curved outer circumference surface is less than 4.3, the flat-shaped tire roller having on the outer circumference surface thereof right-angled slit grooves parallel to a curving line right-angled to the roller rotation direction or oblique slit grooves inclined in the roller rotation direction (the raw material scraping direction) at an angle of 45° or less with respect to the curving line, and the inclination direction of oblique slit grooves on the upper face of the rotary table being directed in the table rotation direction(the raw material scraping direction), which is preferable in view of the crushing of coal or petroleum cokes.
  • the convex-shaped tire roller in which the outer circumference surface thereof is curved in a plane right-angled to the rotation direction and the ratio D/R of the largest roller diameter D and the radius of curvature R of the curved outer circumference surface is 4.3 or more, the convex-shaped tire roller having on the outer circumference surface thereof right-angled slit grooves parallel to a curving line right-angled to the roller rotation direction or oblique slit grooves inclined in the reverse rotation direction (the raw material discharging direction) at an angle of 45° or less with respect to the curving line, and the inclination direction of oblique slit grooves on the upper face of the rotary table being directed in the reverse direction (the raw material discharging direction) of the table rotation direction, which is preferable in view of the crushing of coal or petroleum cokes.
  • the slit grooves may be previously formed before the use of the mill is started or may be wear grooves formed with the use of the mill by arranging materials having a low wear resistance in portions corresponding to the respective grooves.
  • the oblique slit grooves formed on the annular crushing portion of the rotary table basically are straight line grooves from the inner circumference side of the annular crushing portion to the outer circumference side thereof, but may be arcuate grooves curved in the convex direction from the inner circumference side of the rotary table to the outer circumference side thereof.
  • the slit grooves are provided on both the grinding rollers and the rotary table, but in view of preventing adherence, the slit grooves on the grinding rollers are so-called spiral grooves in which the angle thereof with respect to the direction right-angled to the rotation direction is close to 90°, and on the other hand, in view of ensuring the performance of biting and crushing lost on the grinding rollers, the slit grooves on the rotary table are close to the right-angled slit grooves in which the inclination angle thereof with respect to the radius line right-angled to the rotation direction is 45° or less, which is opposite the combination of inclinations of the slit grooves on the vertical roller mill of the present invention.
  • the vertical roller mill as described in JP-A No. 2009-142809 can be effective for preventing vibration due to fine particle adherence in the crushing of limestone, but is unsuitable for the crushing of coal or petroleum cokes.
  • the vertical roller mill described in JP-A No. 2009-142809 is designed so as to prioritize the prevention of fine particles adherence onto the surfaces of the rollers over the crushing of the raw material to be ground.
  • the slit grooves which are inclined at a large angle with respect to the table radius line are provided on the annular crushing portion of the rotary table, so that the raw material feed form which draws the best out of the performance of crushing which is the original performance of the mill can be selected for each mill form, thereby exhibiting a great effect for promoting the crushing of coal or petroleum cokes and contributing to the reduction of the amount of carbon dioxide emissions in an electric-power generating boiler.
  • a grinding roller 2 is opposite the surface of the outer circumference portion of a horizontal rotary table 1 which is a base member.
  • the grinding roller 2 is a frusto-conical shaped roller in Fig. 2 , but can be replaced with a flat-shaped tire roller having D/R of less than 4.3 or a convex-shaped tire roller having D/R of 4.3 or more (see Fig. 1 ).
  • the flat-shaped tire roller 2 is inclined and placed so that the large diameter side is directed to the outer circumference side, the small diameter side is directed to the center side, and the opposite surface of the table 1 is horizontal. Because of the experimenting machine, the number of rollers is one.
  • a plurality of slit grooves 7 are provided on the outer circumference surface of the grinding roller 2.
  • the plurality of slit grooves 7 are right-angled grooves parallel to a straight line right-angled to the rotation direction in Fig. 2 , and bite coal into a crushing chamber formed by the grinding roller 2 and the rotary table with rotation. As shown in Figs.
  • the slit grooves 7 there are the right-angled slit grooves, oblique slit grooves inclined at an angle of 45° in the roller rotation direction (the raw material scraping direction) with respect to a straight line right-angled to the rotation direction, and oblique slit grooves inclined at an angle of 45° in the reverse rotation direction (the raw material discharging direction) with respect to the straight line, and the grinding rollers [ Figs. 3(b) to (d) ] having those slit grooves, respectively, are prepared to the three grinding rollers 2, respectively.
  • the smooth surface roller [ Fig. 3(a) ] without the slit grooves is also prepared to each of the three grinding rollers 2.
  • four kinds of outer circumference surfaces are prepared to the three grinding rollers 2 [see Figs. 1(a) to (c) ].
  • the outer circumference portion of the rotary table 1 opposite the grinding roller 2 becomes an annular crushing portion 3, and because of the experimenting machine, the annular crushing portion 3 is detachable from a table main body 4.
  • the annular crushing portion 3 can be detachably replaced with a flat type combined with the frusto-conical shaped roller, a type with a shallow radius groove combined with the flat-shaped tire roller, or a type with a deep radius groove combined with the convex-shaped tire roller.
  • Figs. 4 (a) to (f) six kinds of tables each having a smooth surface without slit grooves 6 [ Fig.
  • the grinding roller 2 of any of the types is attached so as to be rotatable and movable up and down with respect to a supporting mechanism 5 so that the clearance between the grinding roller 2 and the annular crushing portion 3 can be optionally adjusted.
  • the grinding roller 2 is biased in the direction in which it is pressed onto the annular crushing portion 3 by a spring.
  • the small crushing machine for experiment is designed so as to enable the experiment of all combinations of the rollers and the tables by one experimenting machine.
  • the more detail of the experimenting machine is as follows.
  • the amount of coal discharged to the outside of the table, the amount of coal remaining in the table, and the weight percentage of the occupation of fine particles passing 200 mesh and under -235 mesh in the total amount of crushing after crushing are examined.
  • the most important matter in this experiment is the particle size examination of coal discharged to the outside of the table by the grinding roller itself, and the weight of fine particles under -235 mesh is important for determining the production amount of fine particles.
  • crushing is performed only by one grinding roller, and in the real machine, two or three rollers are used and a classifier for collecting fine particles is installed, so that the experimenting machine shows the percentages finer by weight of fine particles which are quite different from those obtained by the real machine.
  • the comparison of the percentages finer by weight of fine particles according to the difference between the crushing surfaces is examined in crushing under the same conditions.
  • Table 2 shows the results in the case of the frusto-conical shaped grinding roller, and the details are as follows.
  • the combinations e, f, and g of the frusto-conical shaped rollers with the right-angled slit grooves and the tables in which the oblique slit grooves whose angle is formed between the oblique slit grooves and the table radius line is from 65° to 45° are formed on the annular crushing portions show the result of the largest extraction amount of fine particles of -235 mesh.
  • the oblique slit grooves on the rotary tables are inclined to the discharging side, which is not largely different from the cases that the oblique slit grooves are inclined to the scraping side.
  • the combination e shows the largest extraction amount of fine particles of -235 mesh, with a very slight difference.
  • the angle formed between the oblique slits and the table radius line is preferably in the range of 50° to 85°, most preferably 60° to 70°.
  • the inclination of the slit grooves on the grinding roller when the slit grooves are right-angled to the rotation direction, that is, when the slit grooves are not inclined, the performance of biting is most excellent, but the slit grooves are gradually inclined to 45° with respect to the direction right-angled to the rotation direction, the performance of biting is gradually decreased, and on the contrary, the performance of scraping is increased.
  • the performance of biting and the performance of scraping are 50%, and at an angle larger than that, the performance of scraping is increased and the performance of biting is decreased.
  • the percentages finer by weight of h, i, and j are different because the combinations of the slit grooves of the rollers and the tables are different, but totally, they show the overwhelmingly deteriorated numerical values as compared with the combinations of the crushing surfaces of e, f, and g.
  • the main cause is that the coal layer thickness is increased by the scraping effect of the slit grooves. That the coal layer thickness is the cause can be confirmed from the fact that when the crushing surface shapes of both the roller and the table of h, which scrape coal to the inside of the table are combined, the percentage finer by weight is lower than the combination of the smooth surfaces of a.
  • the angle of the slit grooves provided on the grinding roller is 22.5° or less because according to j in the crushing experiment, the combination of the 45°-oblique roller slit grooves to the direction scraping coal to the inside and the 65°-oblique table slits in the direction discharging coal to the outside can obtain a percentage finer by weight of fine particles under -235 mesh of 30.3%.
  • the percentage finer by weight is increased by approximately 5. 24% so as to be approximately 35.6%.
  • the angle of the table slit grooves is gradually decreased from 85° which is the angle formed between the table slit grooves and the table radius line so as to be close to 40°, so that the performance of biting of the table is increased so as to be capable of achieving the target value, and therefore, with regard to the angle of the slit grooves on the grinding roller, 22.5° which is half of 45° is the limit value which can obtain a high percentage finer by weight.
  • Table 3 shows the results in the case of the flat-shaped tire roller, and the details are as follows.
  • the extraction amount of fine particles of -235 mesh is the largest.
  • the inclination angle of the slit grooves on the rotary table with respect to the table radius line is preferably in the range of 50° to 85°, most preferably in the range of 60° to 70°.
  • Table 4 shows the results in the case of the convex-shaped tire roller, and the details are as follows.
  • the percentage finer by weight is found to be increased by approximately 6% to 8% in the combinations c, d, and e.
  • the combinations of the roller with the right-angled slit grooves, the roller with the 45°-oblique (to the discharging side) slit grooves, and the table with the 70°-oblique slit grooves in the coal discharging direction and the coal scraping direction are effective for increasing the percentage finer by weight of fine particles.
  • the percentage finer by weight of fine particles of -235 mesh is 29% and is higher than other combinations, but the difference is within the error range and no data showing the superiority with regard to the directionality of the slit grooves can be obtained.
  • the four roller crushing surface shapes each have the smooth surface, the right-angled slit grooves, the 45°-oblique slits to the scraping side, and the 45°-oblique slits to the discharging side.
  • the crushing experiment is conducted by combinations of these grinding rollers and the smooth surface tables to examine the difference between the percentages finer by weight of fine particles under -235 mesh.
  • the smooth surface table is used so as not to be subjected to the influence of the table. The results are shown in Table 5.
  • the table rotation speed is not 48 rpm and is increased to 60 rpm to easily make the performance difference between the crushing surfaces different.
  • this crushing experiment determines the performance difference between the crushing surfaces, so that when the difference is determined, the performance itself of the roller crushing surface can be observed, and it is considered that this data can be adopted as an evidence.
  • the slit grooves provided on the roller greatly influence the coal scraping function to promote the increase of the percentage finer by weight of fine particles.
  • the crushing portion wears to gradually change line crushing to surface crushing, so that it is considered that the directionality of the table slits can exhibit its effect more.
  • the effect of the directionality is not clarified at the rotation speed at 46 rpm, the effect is clarified at 60 rpm, so that it is considered that the effect is subjected to the influence of the rotation speed.
  • the vertical roller mill including, as the grinding roller, the convex-shaped tire roller is a very high efficiency crushing machine, and has a high characteristic in which crushed coal is discharged to the outside of the table, so that the direction of the slit grooves in the roller and the table is desirably directed in the direction discharging coal to the outside. Thereby, the performance of crushing that this crushing machine has can be promoted more.
  • the inclination angle of the table slit grooves is preferably a large angle from 50° to 85° with respect to the table radius line, and the direction is preferably directed in the direction discharging coal.
  • Table 6 takes the average values of all the numerical values obtained by the crushing surface combination experiments of Tables 2, 3, and 4. It is considered that the average values including poor values and good values clearly show the ability of the rollers themselves.
  • the production amount of fine particles is the largest among the three roller shapes, but the crushing efficiency of the roller itself, that is, the discharge amount of coal, is smaller than that of the convex-shaped tire roller, and is larger than that of the flat-shaped tire roller.
  • the vertical roller mill having the convex-shaped roller is the highest efficiency crushing mill, has the smallest amount of coal remaining in the table among the three, and has the largest discharge amount.
  • the vertical roller mill having the convex-shaped roller is poorer than the vertical roller mill having the frusto-conical shaped roller, and is more excellent than the vertical roller mill having the flat-shaped tire roller.
  • the flat-shaped tire mill tends to be the poorest among the three in terms of the amount of crushing and the performance of crushing.
  • the slit grooves 6 on the annular crushing portion 3 of the rotary table 2 have a straight line, but as shown in Figs. 5(a) and 5(b) , may have a convex curving line from the inner circumference side to the outer circumference side.
  • the slit grooves inclined in the table rotation direction and the slit grooves inclined in the reverse rotation direction are placed in an interior angle region from a straight line inclined at 45° with respect to the table radius line (a straight line inclined at 45° with respect to the inner circle tangent line of the annular crushing portion) to the inner circle of the annular crushing portion (however, the straight line is excluded), and are preferably placed in an interior angle region from a straight line inclined at 50° with respect to the table radius line (a straight line inclined at 40° with respect to the inner circle tangent line of the annular crushing portion) to the inner circle of the annular crushing portion.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP09852580A 2009-12-25 2009-12-25 Moulin à cylindres verticaux Withdrawn EP2517794A1 (fr)

Applications Claiming Priority (1)

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PCT/JP2009/071663 WO2011077565A1 (fr) 2009-12-25 2009-12-25 Moulin à cylindres verticaux

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EP (1) EP2517794A1 (fr)
JP (1) JP5219229B2 (fr)
KR (1) KR20120116449A (fr)
CN (1) CN102665920A (fr)
AU (1) AU2009357050B2 (fr)
WO (1) WO2011077565A1 (fr)

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WO2013108807A1 (fr) * 2012-01-20 2013-07-25 アイエヌジ商事株式会社 Rouleau vertical de broyeur
CN103599827B (zh) * 2013-11-13 2016-05-04 佛山市博晖机电有限公司 一种用于陶瓷原料粉磨的立磨设备
JP6578110B2 (ja) * 2015-03-05 2019-09-18 三菱日立パワーシステムズ株式会社 粉砕ローラ及び粉砕機
KR101692348B1 (ko) 2015-08-27 2017-01-03 (주) 나노기술 3롤의 개별 제어를 이용한 나노입자 분산장치
KR101691785B1 (ko) 2015-08-27 2017-01-02 (주) 나노기술 분산완료 확인이 가능한 3롤밀 개별 제어형 나노입자 분산 시스템
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KR20120116449A (ko) 2012-10-22
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