WO2024150468A1 - 粉砕機 - Google Patents

粉砕機 Download PDF

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Publication number
WO2024150468A1
WO2024150468A1 PCT/JP2023/033810 JP2023033810W WO2024150468A1 WO 2024150468 A1 WO2024150468 A1 WO 2024150468A1 JP 2023033810 W JP2023033810 W JP 2023033810W WO 2024150468 A1 WO2024150468 A1 WO 2024150468A1
Authority
WO
WIPO (PCT)
Prior art keywords
scraper
plate
air chamber
top plate
outer end
Prior art date
Application number
PCT/JP2023/033810
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
千草 照屋
Original Assignee
株式会社Ihi
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 株式会社Ihi filed Critical 株式会社Ihi
Priority to JP2024570025A priority Critical patent/JPWO2024150468A1/ja
Publication of WO2024150468A1 publication Critical patent/WO2024150468A1/ja

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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
    • B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed

Definitions

  • the crusher is configured to crush the material on a rotating table by the table and roller tires that rotate on the table. Most of the crushed material is carried to the top of the crusher by air blown upward from an air chamber below the table. However, some of the material falls into the air chamber. For this reason, the crusher may be equipped with a scraper to remove foreign objects from the air chamber.
  • Patent Document 1 discloses a vertical mill equipped with a scraper for removing foreign matter from an air tunnel below the grinding table.
  • the scraper rotates integrally with the grinding table.
  • the air tunnel is also provided with an air supply duct on its side wall.
  • the scraper in Patent Document 1 includes a hook portion bent in the direction of rotation at its radially outer end. With this configuration, foreign matter is blocked by the hook portion at the radially outer end. Therefore, accumulation of foreign matter at the outlet of the air supply duct is prevented.
  • the accumulation of foreign matter at the outlet of the air intake duct can be a problem in pulverizers.
  • the present disclosure aims to provide a grinder that can suppress the accumulation of foreign matter at the outlet of the air intake duct.
  • a pulverizer includes a rotating table, an air chamber defined below the table, an air supply duct having an outlet on a side wall of the air chamber, the outlet being spaced apart from the floor of the air chamber, a scraper arranged along the floor and rotating around the rotation axis of the table, the scraper extending radially outward relative to the rotation axis, and a top plate connected to the radially outer end of the scraper on the forward side in the direction of rotation and arranged to face the floor, the top plate being arranged at a height equal to or lower than the lower end of the outlet.
  • the crusher may be provided with a side plate that is connected to the radially outer end of the scraper on the forward side in the rotational direction and faces the side wall.
  • the top plate may be positioned at a height greater than the upper edge of the scraper, and the grinder may include a connecting plate connecting the top plate to the upper edge of the scraper.
  • the crusher may be provided with a raschel plate that is disposed at a distance from the scraper on the forward side of the rotation direction and rotates integrally with the scraper, the raschel plate may be disposed at an angle to the scraper in a plan view, and the distance from the radial outer end of the scraper to the radial outer end of the raschel plate may be greater than the distance from the radial outer end of the scraper to the forward end of the top plate.
  • a grinding machine includes a rotating table, an air chamber defined below the table, a scraper disposed along the floor of the air chamber and rotating around the center of rotation of the table and extending radially outward from the center of rotation, a side plate connected to the radially outer end of the scraper on the forward side in the direction of rotation and facing the side wall of the air chamber, and a top plate connected to the radially outer end of the scraper on the forward side in the direction of rotation and facing the floor of the air chamber.
  • FIG. 1 is a schematic cross-sectional side view showing a crusher according to an embodiment.
  • FIG. 2 is a schematic perspective view showing a scraper unit according to the embodiment.
  • FIG. 3 is a schematic side view showing the scraper unit according to the embodiment.
  • FIG. 4 is a schematic plan view showing the scraper unit according to the embodiment.
  • FIG. 5 is a schematic front view showing the scraper unit according to the embodiment.
  • FIG. 1 is a schematic cross-sectional side view of a pulverizer 100 according to an embodiment.
  • the pulverizer 100 pulverizes coal into pulverized coal.
  • the pulverizer 100 may pulverize other materials, such as biomass.
  • the pulverizer 100 includes a casing 1, a table 2, and a plurality of roller tire assemblies 50. Note that only one roller tire assembly 50 is shown in FIG. 1.
  • the pulverizer 100 may further include other components.
  • the casing 1 has a generally cylindrical shape and is arranged so that its central axis extends in the vertical direction.
  • a cylindrical chute 11 is provided in the center of the top of the casing 1.
  • the chute 11 is arranged so that its central axis extends in the vertical direction.
  • a cylindrical outlet section 16 is provided on the side of the chute 11.
  • a reject chute 12 and a rotary classifier 13 are provided around the chute 11.
  • the reject chute 12 has, for example, a truncated cone shape and is arranged coaxially with the chute 11.
  • the reject chute 12 is provided with a slit 12a.
  • the table 2 is provided below the chute 11 inside the casing 1.
  • the table 2 has a roughly disk-shaped portion.
  • the table 2 is rotated around a vertical axis by the motor 3 via the reducer 4.
  • a circular groove 2a is formed on the top surface of the table 2.
  • the "axial direction”, “radial direction”, “circumferential direction” and “rotational direction” relative to the rotation axis of table 2 may be referred to simply as the “axial direction”, “radial direction”, “circumferential direction” and “rotational direction”, respectively.
  • a number of airport ports 14 are provided around the table 2. Note that only one airport port 14 is shown in FIG. 1.
  • a primary air chamber 17 is defined below the table 2.
  • the primary air chamber 17 has a generally annular shape.
  • the primary air chamber 17 is in fluid communication with the airport port 14.
  • An air supply duct 15 is provided in the primary air chamber 17.
  • the air supply duct 15 has an outlet 15a in a side wall 17a of the primary air chamber 17. Air is supplied to the primary air chamber 17 from the air supply duct 15. The air is blown up into the space above the table 2 via the airport port 14.
  • the roller tire assembly 50 is provided inside the casing 1 on the side wall of the casing 1.
  • a plurality of roller tire assemblies 50 are arranged around the table 2, spaced apart from one another along the circumferential direction of the table 2.
  • the roller tire 51 of the roller tire assembly 50 has a contour that engages with the groove 2a of the table 2.
  • the roller tire 51 is driven by the rotation of the table 2 due to friction between the roller tire 51 and the groove 2a.
  • the roller tire assembly 50 can swing around a horizontal pivot shaft 58, and is pushed in the swinging direction by a cylinder 5, such as a hydraulic cylinder, via a plunger 6. With this configuration, the roller tire 51 is pressed against the groove 2a of the table 2.
  • coal is fed into the casing 1 through the chute 11.
  • the coal falls onto the top surface of the table 2.
  • the coal on the table 2 is pulverized into pulverized coal by the roller tires 51 and the grooves 2a of the table 2.
  • Most of the pulverized coal is blown up by air from the air port 14.
  • the pulverized coal passes through the slits 12a of the reject chute 12, and the coarse particles are removed by the classifier 13.
  • the pulverized coal that has passed through the classifier 13 is sent from the outlet 16 to a subsequent process (e.g., a boiler burner).
  • the pulverizer 100 is provided with one or more scraper units 20 for removing foreign matter from the primary air chamber 17.
  • the scraper unit 20 is attached to the table 2 and configured to rotate integrally with the table 2.
  • the scraper unit 20 scrapes up the foreign matter accumulated in the primary air chamber 17 and discharges the scraped up foreign matter from an outlet provided on the floor surface 17b of the primary air chamber 17 into a pyrite box (not shown).
  • the pulverizer 100 is provided with multiple scraper units 20 arranged at equal intervals along the circumferential direction. Note that only one scraper unit 20 is shown in FIG. 1.
  • FIG. 2 is a schematic perspective view showing the scraper unit 20 according to the embodiment.
  • the rotation direction of the table 2 is indicated by an arrow R.
  • the scraper unit 20 includes a base 21, a scraper 22, and a Russell plate 23.
  • the scraper 22 may also be referred to as an "outer scraper.”
  • the scraper unit 20 may also include an inner scraper (not shown) that is positioned radially inward from the scraper 22.
  • the base 21 supports the scraper 22 and the russell plate 23.
  • the base 21 may be fixed to the shaft or underside of the table 2 by a fixed part such as a bracket or a pole (not shown). Therefore, the base 21 rotates together with the table 2.
  • FIG. 3 is a schematic side view showing the scraper unit 20 according to the embodiment, with the scraper unit 20 viewed from the circumferential direction. Note that FIG. 3 shows a cross-sectional view viewed from the opposite side to FIG. 1, and in FIG. 3, the air supply duct 15 is shown on the opposite side (left side) to FIG. 1.
  • the scraper 22 is arranged along the floor surface 17b of the primary air chamber 17. Specifically, the scraper 22 is supported by the base 21 so that a small gap is formed between the lower edge of the scraper 22 and the floor surface 17b. For example, the scraper 22 is fixed to a support plate 21a provided on the base 21. Since the scraper 22 is supported by the base 21, which rotates integrally with the table 2, the scraper 22 also rotates integrally with the table 2.
  • the scraper 22 extends radially outward relative to the rotation axis of the table 2.
  • the scraper 22 is inclined relative to the vertical direction so that the upper edge of the scraper 22 is positioned on the forward side of the rotation direction R relative to the lower edge.
  • the lower end 15b of the outlet 15a of the air supply duct 15 is spaced from the floor surface 17b of the primary air chamber 17.
  • a slope 17c is provided between the side wall 17a and the floor surface 17b of the primary air chamber 17.
  • the upper edge of the scraper 22 is positioned at a height lower than the lower end 15b of the outlet 15a and higher than the slope 17c. That is, the upper edge of the scraper 22 is positioned at a height between the floor surface 17b and the lower end 15b of the outlet 15a. Also, the scraper 22 is positioned so that a small gap is formed between the radially outer end face of the scraper 22 and the slope 17c.
  • a side plate 24, a top plate 25, and a connecting plate 26 are provided at the radially outer end of the scraper 22.
  • the side plate 24, the top plate 25, and the connecting plate 26 are connected to the scraper 22 on the forward side in the rotational direction R.
  • the side plate 24 is connected to the upper edge of the scraper 22 via a connecting plate 26.
  • the side plate 24 is positioned higher than the scraper 22.
  • the side plate 24 is spaced apart from the floor surface 17b of the primary air chamber 17.
  • the upper edge of the side plate 24 is positioned at the same height as or approximately at the same height as the lower end 15b of the outlet 15a of the air supply duct 15. In other embodiments, the upper edge of the side plate 24 may be lower than the lower end 15b of the outlet 15a.
  • FIG. 4 is a schematic plan view showing the scraper unit 20 according to the embodiment, as viewed from above.
  • the direction of rotation of the table 2 is indicated by an arrow R.
  • the side plate 24 extends in the circumferential and axial directions, and faces the side wall 17a of the primary air chamber 17.
  • the side plate 24 is positioned so that a slight step is formed between the side plate 24 and the radially outer end face of the scraper 22 in the radial direction.
  • the side plate 24 is inclined relative to the vertical direction so that the upper edge of the side plate 24 is positioned radially inward relative to the lower edge.
  • the side plate 24 may be parallel to the vertical direction.
  • the side edge of the side plate 24 that is closest to the scraper 22 is inclined with respect to the vertical direction so that the side edge is linearly or approximately linearly continuous with the scraper 22.
  • the side plate 24 has a generally trapezoidal shape when viewed from the radial direction.
  • the top plate 25 is connected to the upper edge of the scraper 22 via a connecting plate 26.
  • the top plate 25 is also connected to the upper edge of the side plate 24.
  • the top plate 25 is positioned at a higher position than the upper edge of the scraper 22.
  • the top plate 25 is also positioned at the same height as the upper edge of the side plate 24.
  • the top plate 25 extends in the circumferential and radial directions.
  • the top plate 25 is spaced apart from the floor surface 17b of the primary air chamber 17 and faces the floor surface 17b.
  • the top plate 25 is disposed at the same height as or approximately at the same height as the lower end 15b of the outlet 15a of the air supply duct 15. In other embodiments, the top plate 25 may be disposed at a lower height than the lower end 15b of the outlet 15a. Referring to FIG. 4, for example, the top plate 25 has a generally trapezoidal shape when viewed vertically (or axially).
  • the connecting plate 26 connects the side plate 24 and the top plate 25 to the scraper 22.
  • the connecting plate 26 is inclined with respect to the vertical direction so that the connecting plate 26 is linearly or approximately linearly continuous with the scraper 22.
  • the connecting plate 26 has a generally rectangular shape.
  • the lower edge of the connecting plate 26 is connected to the upper edge of the scraper 22, and the upper edge of the connecting plate 26 is connected to the edge of the top plate 25 closer to the scraper 22.
  • the radially outer side edge of the connecting plate 26 is connected to the side edge of the side plate 24 closer to the scraper 22.
  • the side plate 24, the top plate 25 and the connecting plate 26 are connected to each other such that no gaps are formed between them.
  • the side plate 24, the top plate 25 and the connecting plate 26 may be formed by bending a single metal plate and connecting adjacent edges by welding, or may be formed by welding three separate metal plates together.
  • the side plate 24, the top plate 25 and the connecting plate 26 are not limited thereto and may be formed by other methods.
  • the connecting plate 26 can be fixed to the scraper 22 by various methods such as bolts, welding or adhesives.
  • the russell plate 23 smoothes out foreign matter that has accumulated on the floor surface 17b before it is scraped up by the scraper 22.
  • the russell plate 23 is positioned away from the scraper 22 on the forward side of the rotation direction R.
  • the russell plate 23 is supported by a base 21 that rotates integrally with the table 2, so the russell plate 23 also rotates integrally with the table 2 and the scraper 22.
  • the raschel plate 23 is disposed at an incline relative to the scraper 22 in a plan view.
  • the scraper 22 is parallel or approximately parallel to the radial direction.
  • the raschel plate 23 is inclined relative to the radial direction. More specifically, the distance L from the radial outer end of the scraper 22 to the radial outer end of the raschel plate 23 is greater than the distance A from the radial outer end of the scraper 22 to the forward end of the top plate 25.
  • the russell plate 23 is shorter than the scraper 22 in the radial direction. Therefore, in this embodiment, the side plate 24 does not overlap with the russell plate 23 in the radial direction.
  • FIG. 5 is a schematic front view showing the scraper unit 20 according to the embodiment, as viewed from the radially inner side.
  • the lower edge of the raschel plate 23 is spaced apart from the floor surface 17b of the primary air chamber 17. More specifically, in this embodiment, the height from the floor surface 17b to the lower edge of the raschel plate 23 is equal to the height from the floor surface 17b to the lower edge of the side plate 24. With this configuration, for example, large foreign objects that have been repelled radially outward by the raschel plate 23 are prevented from getting stuck between the side plate 24 and the floor surface 17b. In other embodiments, the height from the floor surface 17b to the lower edge of the raschel plate 23 may be lower or higher than the height from the floor surface 17b to the lower edge of the side plate 24.
  • the crusher 100 as described above includes a rotating table 2, a primary air chamber 17 defined below the table 2, an air supply duct 15 having an outlet 15a in a side wall 17a of the primary air chamber 17, the outlet 15a being spaced apart from the floor surface 17b of the primary air chamber 17, a scraper 22 arranged along the floor surface 17b and rotating around the rotation axis of the table 2, the scraper 22 extending radially outward relative to the rotation axis, and a top plate 25 connected to the forward side of the rotation direction R with respect to the radial outer end of the scraper 22 and arranged to face the floor surface 17b.
  • the top plate 25 is arranged at a height equal to or lower than the lower end 15b of the outlet 15a.
  • the top plate 25 is provided at the radial outer end of the scraper 22. This top plate 25 is positioned at a height equal to or lower than the lower end 15b of the outlet 15a of the air supply duct 15. Therefore, the top plate 25 prevents foreign matter from accumulating beyond the lower end 15b of the outlet 15a. Therefore, foreign matter cannot enter the outlet 15a, and accumulation of foreign matter at the outlet 15a of the air supply duct 15 can be suppressed.
  • the crusher 100 also includes a side plate 24 that is connected to the radially outer end of the scraper 22 on the forward side in the rotation direction R and faces the side wall 17a. This configuration makes it possible to block foreign matter from the side as well. This further prevents foreign matter from entering the outlet 15a of the air supply duct 15.
  • the top plate 25 is also positioned at a height higher than the upper edge of the scraper 22, and the crusher 100 is equipped with a connecting plate 26 that connects the top plate 25 to the upper edge of the scraper 22.
  • the top plate 25 can be positioned at a higher position. This makes it possible to increase the space in which foreign objects are temporarily held, and prevents the foreign objects from overflowing from the top plate 25.
  • the connecting plate 26 also prevents the foreign objects from leaking backward in the direction of rotation R from the scraper 22 and top plate 25.
  • the crusher 100 also includes a raschel plate 23 that is disposed at a distance from the scraper 22 on the forward direction of the rotation direction R and rotates integrally with the scraper 22, and the raschel plate 23 is disposed at an angle to the scraper 22 in a plan view, and the distance L from the radial outer end of the scraper 22 to the radial outer end of the raschel plate 23 is greater than the distance A from the radial outer end of the scraper 22 to the forward end of the top plate 25.
  • the raschel plate 23 is significantly inclined radially inward, and foreign matter is likely to be collected radially inward. This makes it possible to slow the radially outward movement of foreign matter due to centrifugal force.
  • the crusher 100 includes a rotating table 2, a primary air chamber 17 defined below the table 2, a scraper 22 arranged along the floor surface 17b of the primary air chamber 17 and rotating around the center of rotation of the table 2, the scraper 22 extending radially outward from the center of rotation, a side plate 24 connected to the radially outer end of the scraper 22 on the forward side in the rotation direction R and facing the side wall 17a of the primary air chamber 17, and a top plate 25 connected to the radially outer end of the scraper 22 on the forward side in the rotation direction R and facing the floor surface 17b of the primary air chamber 17.
  • the side plate 24 blocks the foreign matter moving radially outward.
  • the top plate 25 blocks foreign matter that climbs over the scraper 22 and the side plate 24. Therefore, the foreign matter cannot move radially outward from the side plate 24, and accumulation of foreign matter at the outlet 15a of the air supply duct 15 can be suppressed.
  • the crusher 100 includes both a side plate 24 and a top plate 25.
  • the crusher 100 may include only a top plate 25.
  • the outlet 15a of the air supply duct 15 is spaced from the floor surface 17b of the primary air chamber 17, and the top plate 25 is positioned at a height equal to or lower than the lower end 15b of the outlet 15a.
  • the lower end 15b of the outlet 15a may be located at the same height as the floor surface 17b.
  • the top plate 25 may be positioned at a height higher than the lower end 15b of the outlet 15a.
  • This disclosure can promote better energy supply through better facilities, thereby contributing to Goal 7 of the United Nations-led Sustainable Development Goals (SDGs) to "Ensure access to affordable, reliable, sustainable and modern energy.”
  • SDGs Sustainable Development Goals

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
PCT/JP2023/033810 2023-01-11 2023-09-15 粉砕機 WO2024150468A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2024570025A JPWO2024150468A1 (enrdf_load_stackoverflow) 2023-01-11 2023-09-15

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023002553 2023-01-11
JP2023-002553 2023-01-11

Publications (1)

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WO2024150468A1 true WO2024150468A1 (ja) 2024-07-18

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6245351A (ja) * 1985-08-22 1987-02-27 川崎重工業株式会社 竪型ミルの異物排出用スクレ−パ
WO1999010101A1 (en) * 1997-08-22 1999-03-04 Transfield Pty. Ltd. Removal of non-combustibles from coal in mills
JP2020168616A (ja) * 2019-04-04 2020-10-15 三菱日立パワーシステムズ株式会社 石炭粉砕機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6245351A (ja) * 1985-08-22 1987-02-27 川崎重工業株式会社 竪型ミルの異物排出用スクレ−パ
WO1999010101A1 (en) * 1997-08-22 1999-03-04 Transfield Pty. Ltd. Removal of non-combustibles from coal in mills
JP2020168616A (ja) * 2019-04-04 2020-10-15 三菱日立パワーシステムズ株式会社 石炭粉砕機

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