WO2011077565A1 - 竪型ローラミル - Google Patents
竪型ローラミル Download PDFInfo
- Publication number
- WO2011077565A1 WO2011077565A1 PCT/JP2009/071663 JP2009071663W WO2011077565A1 WO 2011077565 A1 WO2011077565 A1 WO 2011077565A1 JP 2009071663 W JP2009071663 W JP 2009071663W WO 2011077565 A1 WO2011077565 A1 WO 2011077565A1
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- WO
- WIPO (PCT)
- Prior art keywords
- roller
- crushing
- slit groove
- rotary table
- vertical roller
- Prior art date
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Classifications
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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
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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
- B02C15/003—Shape or construction of discs or rings
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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
- B02C15/004—Shape or construction of rollers or balls
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- 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
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- 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
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- 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 finely pulverizing coal or petroleum coke used as fuel or the like in a power generation boiler.
- This commitment is an extremely difficult figure that the public and industry have to bear a great responsibility to achieve, but after making a commitment, we must strive toward that goal. To that end, it is very important to reduce the amount of carbon dioxide generated from coal and petroleum coke used in power generation boilers.
- a typical technique is the improvement of the roller crushing surface shape described in Patent Documents 1 and 2, particularly the development of a slit roller.
- the slit roller is formed by forming slit grooves in the center line direction at predetermined intervals in the circumferential direction on the outer peripheral surface which is a crushing surface of the grinding roller.
- the average coal pulverization particle size is 200 mesh passing and 75% average, but this pulverization particle size is further reduced, and 200 mesh passing and 75% over fine powder is larger than the conventional mill. If it becomes possible to collect the fuel, the combustion efficiency in the boiler will be improved, resulting in complete combustion and contributing to the reduction of carbon dioxide emissions.
- pig iron is produced in a blast furnace at a smelter, but a large amount of coke reducing gas is generated and used to reduce and dissolve iron ore, but because coke is produced from expensive caking coal, it is very In order to reduce the amount used, pulverized coal that is cheaper than the blast furnace tuyere is blown to reduce coke consumption and reduce pig iron production costs.
- Vertical roller mills are often used as coal pulverizers in power generation boilers.
- the vertical roller mill is composed of one drive table that rotates horizontally, and a plurality of grinding rollers arranged on the drive table so as to surround the rotation center line.
- the coal supplied to is conveyed outward by centrifugal force and is crushed one after another by being bitten between the roller and the table.
- the pulverized coal is air-carryed upward by a carrier air-flow and classified by a classifier, the coal having the required particle size is captured and conveyed to the subsequent stage, and the coal having a larger particle size is returned to the inside of the mill again.
- the vertical roller mill for coal pulverization is a Roche mill type in which the shape of the pulverization roller is a trapezoidal shape, and the circular crushing part on the upper surface of the rotary table is a horizontal surface, and the outer peripheral surface of the pulverization roller is within the plane perpendicular to the rotation direction. It is roughly classified into a tire type type which is curved in a convex direction to the side and has an annular groove having an arc cross section in which the outer peripheral surface of the grinding roller is fitted on the upper surface of the rotary table.
- the tire-type crushing roller further has a ratio of the maximum diameter D to the radius of curvature R in a plane perpendicular to the rotation direction of the tire crushing surface of 4.3 or more, and a flat type tire less than 4.3. Be divided.
- the average D / R of the former convex tire was 4.5 to 5.0
- An object of the present invention is to provide a vertical roller mill that is effective in reducing the pulverization particle size in the pulverization of coal or petroleum coke.
- the present inventor studied the combination of the crushing surface shape of the rotary table and the crushing roller in the vertical roller mill, and studied the appropriate combination of both of which a finer particle can be obtained than before. That is, when the vertical roller mill is reconsidered only in terms of fine pulverization of coal or petroleum coke, the one described in Patent Document 3 will be described in detail later. Although the function is reversed in combination with the crushing surface, it may be effective to prevent fine powder from adhering to the surface of the crushing roller during limestone crushing.
- the present inventor is able to collect a large amount of 200-mesh under and -235-mesh under coal pulverization and contribute to the reduction of carbon dioxide emissions. The experiment was conducted.
- a basic experiment was conducted to determine how the difference in the three types of roller shapes of A), B) and C) below affects the pulverizability. The sex and its properties were investigated. However, the table rotation speed was constant for the three types of rollers, and the test was performed at a rotation speed of 48 RPM. The testing machine will be described later. The test results are shown in Table 1. Further, the positional relationship and each shape of the rotary table and the crushing roller are schematically shown in FIGS. 1 (a) to 1 (c).
- the crushing surface of the roller and the crushing surface of the rotary table are parallel to each other, the surfaces are facing each other, and crushing is performed between the surfaces. Utilized effectively. For this reason, the pulverization amount of the fine powder having passed through 200 mesh was the most excellent among the three types of roller crushing surface shapes. More specifically, since the crushing roller has a trapezoidal shape, crushing is mainly performed on the large-diameter side where the peripheral speed is fast, but the peripheral speed on the large-diameter side and the peripheral surface on the small-diameter side are different, so When the is rotated, slipping easily occurs.
- the pulverization is performed by the pulverization by the compression load and the shear load generated by the slip of the roller, and is effectively performed by the synergistic effect of both surface loads. Since the roller surface pressure tends to be applied excessively so that slip does not occur frequently, if a slit groove is attached to this roller, the biting property is improved, and the roller surface added excessively to prevent slipping. The pressure is automatically converted to the coal crushing load, the amount of pulverization increases, and the amount of fine powder pulverization also increases.
- This vertical roller mill has excellent performance as a coal grinding machine and can be said to be one of high-efficiency grinding machines.
- the main pulverization part of the actual machine is a roller small-diameter part on the outer peripheral side of the table, but the reverse is the small-diameter part on the inner peripheral side of the table in the experimental machine. It was assumed that the grinding point was different due to the difference in table rotation speed. However, although the positions are different, the pulverization position is the same as that of the small-diameter portion, so that the operational effects may be regarded as the same.
- the main pulverization property is improved as compared with the B roller, the main pulverization is performed on the center side of the large diameter, the main pulverization area is narrower than B, and is close to the linear pulverization until wear occurs.
- the actual machine is also uneconomical because it cannot be reversed because of wear on the center side.
- coal is supplied less than the rated operation, but it is said that vibration is likely to occur during low-load operation. This is presumably because, for high-efficiency pulverization, the coal caught in the pulverization chamber is discharged with an excellent scraping ability, so that the coal layer thickness becomes thin and slip is likely to occur.
- the production amount of fine powder is inclined up to 45 degrees with respect to the right angle slit groove perpendicular to the rotation direction and the rotation direction, compared to the existing combination of crushing surfaces of smooth surfaces. It was speculated that slit grooves with angles were optimal.
- the right-side slit groove was very effective in the actual machine and the experiment for the A grinding roller and the C grinding roller, but the superiority of the slit groove for the B roller was not recognized in the experiment.
- the grinding roller can be a right angle slit groove or a right angle to 45 degree oblique slit groove. The direction in which coal was scraped into the table was adopted.
- the peripheral speed is slow, the coal scraping action is inferior, and the width of the slit groove intersecting with the main pulverization line is narrow, and the effect of biting coal by the slit groove is exhibited. There wasn't. This cause may be affected by the slow table rotation speed.
- the angle of the slit groove to be attached to the table is expressed as an inclination angle with respect to the radial line perpendicular to the rotation direction, and the biting property is improved in the range of 0 to 45 degrees, so that the coal transportability and transportability are given. From the viewpoint, it was determined that 45 degrees is preferable and 50 to 85 degrees is particularly preferable.
- the grinding roller in the vertical roller mill is provided with a right-angle slit groove or an inclined slit groove of up to 45 degrees from the viewpoint of biting property, and the rotary table has the 45 described above from the viewpoint of feeding the raw material to the main grinding part.
- the amount of fine powder particle size under -235 mesh increases due to the functional sharing between the roller and the table, in which inclined slit grooves of more than 50 degrees, preferably 50 to 85 degrees are provided.
- the vertical roller mill of the present invention has been completed based on such knowledge, and is a rotary table that is driven to rotate, and a free roller that is disposed at a fixed position on the rotary table so as to surround the rotation center line of the rotary table.
- a vertical roller mill that includes a plurality of crushing rollers, and that crushes and crushes the pulverized raw material between the crushing rollers as the rotary table is rotated, the annular crushing portion on the upper surface of the rotary table has a radius against the table radius line.
- a plurality of inclined slit grooves inclined in the table rotating direction or counter-rotating direction are provided at predetermined intervals in the circumferential direction, and each inclined slit groove is present in a region exceeding 45 degrees with respect to the radial line. It is a feature point.
- the grinding roller is provided with a right-angle slit groove perpendicular to the rotation direction or an inclined slit groove with a small inclination angle with respect to this, and the biting and grinding performance is improved by increasing the biting and grinding performance on the side of the grinding roller. It is possible to achieve a high level of compatibility, and by performing this under conditions specific to the type of grinding roller in the vertical roller mill, a high fine grinding effect can be obtained in any vertical roller mill.
- Each inclined slit groove in the rotary table has an inner angle from a straight line inclined by 50 degrees with respect to the table radius line (a straight line inclined by 40 degrees with respect to the inner circle tangent of the annular pulverized portion) to the inner circle of the annular pulverized portion. It is particularly preferred to be in the region.
- a right-angle slit groove parallel to a straight line perpendicular to the roller rotation direction or an angle of 22.5 degrees or less with respect to the straight line on the outer peripheral surface of the counterweight-shaped roller It is preferable from the viewpoint of pulverizing coal or petroleum coke to provide inclined slit grooves inclined in the rotational direction or in the counter-rotating direction.
- a vertical roller mill provided with a flat type tire roller whose outer peripheral surface is curved in a plane perpendicular to the rotation direction as a grinding roller and the ratio D / R of the maximum roller diameter D and the curvature radius R of the curved outer peripheral surface is less than 4.3 Is inclined in the roller rotation direction (raw material scraping direction) at an angle of 45 degrees or less with respect to the curved line perpendicular to the curved line perpendicular to the roller rotating direction or the curved line perpendicular to the roller rotating direction. It is preferable from the viewpoint of pulverization of coal or petroleum coke that the inclined slit groove is provided and the inclined direction of the inclined slit groove on the upper surface of the rotary table is the table rotating direction (raw material scraping direction).
- a vertical roller mill comprising a convex tire roller whose outer peripheral surface is curved as a grinding roller in a plane perpendicular to the rotation direction and the ratio D / R between the maximum roller diameter D and the radius of curvature R of the curved outer peripheral surface is 4.3 or more Is inclined in the counter-rotating direction (raw material discharge direction) at an angle of 45 degrees or less with respect to the curved line perpendicular to the curved line perpendicular to the roller rotation direction or the curved line perpendicular to the circumferential direction of the convex tire roller. It is preferable from the viewpoint of pulverization of coal or petroleum coke that an inclined slit groove is provided and the inclined direction of the inclined slit groove on the upper surface of the rotary table is opposite to the table rotating direction (raw material discharge direction).
- the slit groove may be formed in advance from the start of use of the mill, or a material with low wear resistance is arranged in a portion corresponding to each groove, and the mill is used. It may be a wear groove formed.
- the inclined slit groove formed in the annular crushing portion of the rotary table is basically a straight groove extending from the inner peripheral side to the outer peripheral side of the annular crushing portion, but in a direction protruding from the inner peripheral side of the rotary table to the outer peripheral side. It may be a curved arcuate groove.
- slit grooves are provided in both the pulverizing roller and the rotary table, but the slit grooves in the pulverizing roller are in a direction perpendicular to the rotational direction from the viewpoint of preventing adhesion.
- the slit groove in the rotary table has an inclination angle of 45 with respect to a radial line perpendicular to the rotation direction from the viewpoint of securing the biting and pulverizing property lost on the side of the pulverizing roller. It is a form close to a right angle slit groove of less than or equal to the degree, and is opposite to the combination of the inclination of the slit groove in the vertical roller mill of the present invention.
- the vertical roller mill described in Patent Document 3 may be effective in preventing vibration due to fine powder adhesion during limestone crushing, but is not suitable for the fine crushing of coal and petroleum coke. That is, the vertical roller mill described in Patent Document 3 has a design that prioritizes prevention of fine powder adhesion to the roller surface rather than pulverization of the pulverized raw material.
- a slit groove inclined at a large angle with respect to the table radial line is provided in the annular crushing portion of the rotary table, so that the pulverization ability that is the original performance of the mill is maximized for each mill type.
- the raw material supply form can be selected, and thereby, it exerts a great effect in promoting the pulverization of coal or petroleum coke, thereby contributing to the suppression of carbon dioxide emissions in a power generation boiler or the like.
- (A)-(c) is the schematic diagram which showed the main grinding
- (A)-(d) is a schematic diagram which shows the form of the slit groove in a grinding roller.
- (A)-(f) is a schematic diagram which shows the form (mainly inclination direction and inclination angle) of the slit groove in the crushing part of a rotary table.
- (A) (b) is a schematic diagram which shows the form (mainly shape) of the slit groove in the crushing part of a rotary table.
- this crusher assuming a vertical roller mill has a structure in which the crushing roller 2 faces the outer peripheral surface of the horizontal rotary table 1 as a base member.
- the crushing roller 2 is a frustoconical roller in FIG. 2, but can be replaced with a flat tire roller having a D / R of less than 4.3 and a convex tire roller having a D / R of 4.3 or more (see FIG. 2). 1).
- the flat type tire roller 2 is inclined so that the large diameter side is directed to the outer peripheral side and the small diameter side is directed to the central side, and the surface facing the table 1 is horizontal. Since it was an experimental machine, the number of rollers was one.
- a plurality of slit grooves 7 are provided on the outer peripheral surface of the grinding roller 2.
- the plurality of slit grooves 7 are right-angle grooves parallel to a straight line perpendicular to the rotation direction, and the coal is brought into a crushing chamber formed by a rotating table with the rotation.
- the slit groove 7 has an angle of 45 degrees in the roller rotation direction (raw material scraping direction) with respect to a straight line perpendicular to the rotation direction in addition to the right angle slit groove.
- the pulverizing rollers FIGS. 3A to 3D
- each table has a flat surface without the slit groove 6 (FIG. 4 (a)), and the surface is perpendicular to the table radial direction perpendicular to the table rotation direction.
- One having slit grooves 6 FIG.
- the crushing roller 2 is attached to the support mechanism 5 so as to be rotatable and movable up and down so that the clearance with the annular crushing portion 3 can be arbitrarily adjusted. Further, in order to apply a predetermined pressure to the pulverized raw material, the pulverizing roller 2 is urged by a spring in a direction to be pressed against the annular crushing portion 3.
- the rotation table 1 and the crushing roller 2 perform a relative turning motion by the rotation of the rotation table 1.
- no classifier using pulverized coal air is installed. Therefore, since the pulverized coal as the pulverized raw material is discharged from the inside of the rotary table to the outside due to the discharge capability of the roller and the centrifugal force of the table rotation, it is possible to completely collect the discharged coal outside the rotary table 1.
- a collection container 8 was installed.
- the experimental small pulverizer was designed so that a combination test of all the rollers and the table could be performed by one tester. Further details of the testing machine are as follows.
- Coal supply amount about 2550 g / 30 minutes
- Coal supply method Coal used for continuous feed screw feeder system test: Initial particle size distribution of iron-making raw coal 20 mesh or more 40 g More than 60 mesh 34g 120g or more 3g 13 mesh over 200 mesh 235 mesh or more 2g P 9g 5% moisture When measuring the particle size, each sample is measured after being dried for 30 minutes. Temperature and humidity are 25 to 32 ° C and 51 to 87%, respectively.
- A) The combination in the case of a trapezoidal crushing roller is as follows. a) Smooth surface roller + Smooth surface table b) Right angle slit groove + Smooth surface table c) 45 degree inclined slit groove Scraping + Smooth surface table d) Right angle slit groove + Right angle slit groove e) Right angle slit groove + 65 degree oblique slit groove Discharge side f) Right angle slit groove +45 degree oblique slit groove Discharge side g) Right angle slit groove +65 degree oblique slit groove Scrap back h) Diagonal 45 degree slit groove scraping +65 degree oblique slit groove Scrap back i) Diagonal 45 degree slit groove Discharge Side +65 degree diagonal slit groove discharge side j) diagonal 45 degree slit groove scraping +65 degree diagonal slit groove discharge side
- Table 2 shows the results for the trapezoidal crushing roller, and details are as follows.
- a combination of a trapezoidal roller with a right-angle slit groove of e, f, g and a table in which an inclined slit groove with an angle of 65 to 45 degrees formed by the table radius line is formed in the annular crushing portion is ⁇ 235
- the result with the largest amount of fine powder collected from the mesh was shown.
- the direction of the inclined slit groove on the rotary table is somewhat more inclined to the discharge side, but no significant difference has occurred from the inclination to the scraping side.
- the crushing between the roller and the table is surface crushing, and if the coal in the crushing chamber formed by both moves between the surfaces, the time required for crushing is much longer if it moves on the scraping side or the discharge side Becomes longer and is easily pulverized.
- the angle of the inclined slit attached to the table is preferably in the range of 50 to 85 degrees with the table radius line, and the most preferable angle is 60 to 70 degrees.
- the inclination of the slit groove in the pulverizing roller if theoretically considered, the case where the slit groove is perpendicular to the rotation direction, that is, the case where there is no inclination, is most excellent in biting property, but the slit groove is gradually increased with respect to the direction perpendicular to the rotation direction. If the inclination angle is increased to 45 degrees, the biting performance gradually decreases, while the scraping performance increases. At an angle of 45 degrees, the biting property and the scratching property are theoretically 50%, and when the angle is more than that, the scratching property is increased and the biting property is reduced.
- the crushing roller with the inclined slit groove having an inclination angle of 45 degrees has a strong ability to scrape the coal as described above, and the table is provided with a 65-degree slit groove, so that the coal is scraped. It is presumed that the tendency to approach is further increased, and as a result, the coal layer thickness is increased, the roller pressing force with respect to the layer thickness is insufficient, and the pulverization amount of fine powder is reduced.
- the fineness of h, i, and j differs because the combination of the slit groove of the roller and the table is different, but when viewed in total, it is overwhelming compared to the crushing surface combination of e, f, and g. Inferior figures.
- the main factor is that the thickness of the coal layer has increased due to the scraping effect of the slit grooves.
- the reason for the coal layer thickness was that when both the roller and table of h were combined with a crushing surface shape that scrapes the coal inside the table, the fineness was inferior to that of the combination of smooth surfaces of a. It can be confirmed from.
- the angle of the slit groove provided on the grinding roller is 22.5 degrees or less.
- the roller slit groove is 45 degrees oblique and the direction in which the coal is scraped and the table slit is 65 degrees oblique slit groove. This is because a fineness of 30.3% of ⁇ 235 mesh or less was obtained in combination with the direction of discharging coal to the outside.
- the slit groove angle in the crushing roller is 22.5 of 1/2 of 45 degrees, it is estimated that the fineness is improved by about 5.24% to about 35.6%.
- the target value is set to 38% to 40%, the table slit groove angle is gradually decreased from 85 degrees by the angle formed with the table radius line and approached to 40 degrees to increase the biting ability by the table. Since the target value can be achieved, the slit groove angle in the crushing roller is set to a limit value at which 22.5 degrees, which is 1/2 of 45 degrees, can obtain a high fineness.
- Table 3 shows the results for the flat type tire roller, and details are as follows. *
- the inclination angle of the slit groove of the rotary table with respect to the table radial line is preferably in the range of 50 to 85 degrees, and most preferably in the range of 60 to 70 degrees.
- the combination of a roller with a 45-degree oblique (discharge side) slit groove and a table with an oblique 70-degree (discharge side) slit groove is a 235 mesh fine powder pulverization amount of 29% compared to other combinations.
- the difference was within an error range, and data indicating superiority with respect to the directionality of the slit groove could not be obtained.
- a vertical roller mill having a convex tire roller as a crushing roller is a very high-efficiency crusher and has a high property of discharging the pulverized coal to the outside of the table. It is desirable to make the direction to discharge to the outside. Thereby, it is possible to further promote the pulverization performance of the pulverizer.
- the inclination angle of the table slit groove is preferably a large angle of 50 to 85 degrees with respect to the table radial line, and the direction is preferably the direction of discharging coal.
- Table 6 shows the average value of all the numerical values obtained in the crushing / crushing surface combination test of Table 2, Table 3 and Table 4. Although both bad and good numbers are included, it is thought that this average value including them clearly talks about the performance of the roller itself.
- the trapezoidal roller produces the largest amount of fine powder among the three types of roller shapes, but the crushing efficiency of the roller itself, that is, the coal discharge amount, is inferior to that of the convex tire roller, and is a flat type. Superior to tire rollers.
- a vertical roller mill having a convex tire roller is the most efficient crushing mill, and the amount of coal remaining on the table is the smallest among the three and the amount of discharge is the largest.
- the fineness is inferior to a vertical roller mill having a trapezoidal roller, and superior to a vertical roller mill having a flat tire roller.
- the flat type tire mill tended to be inferior among the three in terms of pulverization amount and fine pulverization.
- the slit groove 6 in the annular crushing portion 3 of the turntable 2 is a straight line.
- a straight line inclined by 45 degrees with respect to the table radial line (inclined by 45 degrees with respect to the inner circle tangent line of the annular grinding portion) It is only necessary to exist in an inner angle region (excluding the straight line) from the straight line to the inner circle of the annular pulverized portion, and preferably a straight line (of the annular pulverized portion is inclined by 50 degrees with respect to the table radius line). It suffices if it exists in the inner angle region from the inner circle tangent line to the inner circle of the annular pulverized portion.
- curvilinear (arc-shaped) slit grooves 6 also do not hinder the material discharge function and the material scraping function. In the case of a curved (arc-shaped) slit groove curved in the opposite direction, these functions are greatly hindered.
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Abstract
Description
B)タイヤ型粉砕ローラD/R<4.3(偏平型)
C)タイヤ型粉砕ローラD/R≧4.3(凸型)
台錘形状ローラ 太径:200mm
小径:170mm
幅57mm
偏平型タイヤローラD/R =4.0 太径:200mm
タイヤR:50mm
幅74mm
凸型タイヤローラD/R =5.0 太径:200mm
タイヤR:40mm
幅66mm
テーブル寸法:
台錘形状ローラ 外径:410mm
内径:280mm
偏平型タイヤローラD/R =4.0 外径:420mm
内径:220mm
溝R:60mm
凸型タイヤローラD/R =5.0 外径:410mm
内径:230mm
溝R:50mm
ローラ加圧: スプリング加圧方式
ローラとテーブルとのクリアランス: 0mm
試験時間: 30分間
石炭供給量: 約2550g/30分間
石炭供給方法: 連続供給スクリューフィーダー方式
試験に使用した石炭: 製鉄原料炭
初期粒度分布 20メッシュ以上 40g
60メッシュ以上 34g
120メッシュ以上 3g
200メッシュ以上 13g
235メッシュ以上 2g
P 9g
水分量 5%
粒度測定時、各試料は30分間乾燥後、測定する。
温度、湿度はそれぞれ25~32℃、51~87%
a)平滑面ローラ +平滑面テーブル
b)直角スリット溝 +平滑面テーブル
c)45度傾斜スリット溝 掻き戻し+平滑面テーブル
d)直角スリット溝 +直角スリット溝
e)直角スリット溝 +65度斜めスリット溝 排出側
f)直角スリット溝 +45度斜めスリット溝 排出側
g)直角スリット溝 +65度斜めスリット溝 掻き戻し
h)斜め45度スリット溝 掻き戻し+65度斜めスリット溝 掻き戻し
i)斜め45度スリット溝 排出側 +65度斜めスリット溝 排出側
j)斜め45度スリット溝 掻き戻し+65度斜めスリット溝 排出側
a)平滑面ローラ +平滑面テーブル
b)直角スリット溝 +平滑面テーブル
c)斜め45度スリット溝掻き込み+平滑面テーブル
d)直角スリット溝 +45度斜めスリット溝掻き込み
e)斜め45度スリット溝掻き込み+65度斜めスリット溝掻き込み
f)直角スリット溝 +65度斜めスリット溝掻き込み
g)直角スリット溝 +65度斜めスリット溝排出側
a)平滑面ローラ +平滑面テーブル
b)直角スリット溝 +平滑面テーブル
c)直角スリット溝 +70度斜めスリット溝 掻き込み
d)直角スリット溝 +70度斜めスリット溝 排出側
e)斜め45度スリット溝 排出側+70度斜めスリット溝 排出側
2 粉砕ロール
3 環状破砕部
4 テーブル本体
5 支持機構
6,7 スリット溝
8 捕集用容器
Claims (8)
- 回転駆動される回転テーブルと、回転テーブルの回転中心線を包囲するように回転テーブル上の定位置に配置されたフリーローラからなる複数個の粉砕ローラとを備え、回転テーブルの回転駆動に伴って粉砕ローラとの間に粉砕原料を噛み込み破砕する竪型ローラミルにおいて、
回転テーブル上面の環状破砕部にテーブル半径線に対してテーブル回転方向又は反回転方向に傾斜した複数の傾斜スリット溝が周方向に所定間隔で設けられており、個々の傾斜スリット溝は半径線に対して45度を超える領域に存在することを特徴とする竪型ローラミル。 - 請求項1に記載の竪型ローラミルにおいて、個々の傾斜スリット溝は、テーブル半径線に対して50度傾斜した直線(環状粉砕部の内円接線に対して40度傾斜した直線)から環状粉砕部の内円に至るまでの内角領域に存在する竪型ローラミル。
- 請求項1又は2に記載の竪型ローラミルにおいて、粉砕ローラとして台錐形状ローラを備え、当該台錘形状ローラの外周面に、ローラ回転方向に直角な直線に平行な直角スリット溝又は当該直線に対して22.5度以下の角度で回転方向又は反回転方向に傾斜した傾斜スリット溝を有する竪型ローラミル。
- 請求項1又は2に記載の竪型ローラミルにおいて、粉砕ローラとして外周面が回転方向に直角な面内で湾曲し最大ローラ径Dと湾曲外周面の曲率半径Rとの比率D/Rが4.3未満の扁平型タイヤローラを備え、当該偏平型タイヤローラの外周面に、ローラ回転方向に直角な湾曲線に平行な直角スリット溝又は当該湾曲線に対して45度以下の角度でローラ回転方向(原料掻き戻し方向)に傾斜した傾斜スリット溝を有し、回転テーブル上面における傾斜スリット溝の傾斜方向がテーブル回転方向(原料掻き戻し方向)である竪型ローラミル。
- 請求項1又は2に記載の竪型ローラミルにおいて、粉砕ローラとして外周面が回転方向に直角な面内で湾曲し最大ローラ径Dと湾曲外周面の曲率半径Rとの比率D/Rが4.3以上の凸型タイヤローラを備え、当該凸型タイヤローラの外周面に、ローラ回転方向に直角な湾曲線に平行な直角スリット溝又は当該湾曲線に対して45度以下の角度で反回転方向(原料排出方向)に傾斜した傾斜スリット溝を有し、回転テーブル上面における傾斜スリット溝の傾斜方向がテーブル回転方向に対して逆方向(原料排出方向)である竪型ローラミル。
- 請求項1~5の何れかに記載の竪型ローラミルにおいて、スリット溝は当該ミルの使用開始前より予め形成されている竪型ローラミル。
- 請求項1~5の何れかに記載の竪型ローラミルにおいて、スリット溝はそれらの溝に対応する部分に耐摩耗性の低い材料が配置され、当該ミルの使用に伴って形成される磨耗溝である竪型ローラミル。
- 請求項1~7の何れかに記載の竪型ローラミルにおいて、回転テーブルに形成される傾斜スリット溝は、回転テーブルの内周側から外周側へ凸の方向に湾曲した弧状溝である竪型ローラミル。
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AU2009357050A AU2009357050B2 (en) | 2009-12-25 | 2009-12-25 | Vertical roller mill |
CN2009801631338A CN102665920A (zh) | 2009-12-25 | 2009-12-25 | 立式辊磨机 |
KR1020127019561A KR20120116449A (ko) | 2009-12-25 | 2009-12-25 | 수직형 롤러 밀 |
EP09852580A EP2517794A1 (en) | 2009-12-25 | 2009-12-25 | Vertical roller mill |
JP2011547174A JP5219229B2 (ja) | 2009-12-25 | 2009-12-25 | 竪型ローラミル |
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WO2013108807A1 (ja) * | 2012-01-20 | 2013-07-25 | アイエヌジ商事株式会社 | 竪型ミルローラ |
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 |
KR101691785B1 (ko) | 2015-08-27 | 2017-01-02 | (주) 나노기술 | 분산완료 확인이 가능한 3롤밀 개별 제어형 나노입자 분산 시스템 |
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CN107552196A (zh) * | 2017-10-30 | 2018-01-09 | 朱灵龙 | 一种活性炭粉碎设备 |
CN112452448A (zh) * | 2018-08-08 | 2021-03-09 | 李娜 | 一种建筑工程用的节能立式磨磨盘 |
CN109092445B (zh) * | 2018-08-20 | 2020-08-04 | 中建幸福有限公司 | 一种应用于建筑工程的立式磨磨盘 |
CN113814035B (zh) * | 2020-09-21 | 2022-12-06 | 承德天成印刷科技股份有限公司 | 一种高效率的数字印刷油墨原料研磨装置 |
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