WO2018016266A1 - 竪型ローラミル - Google Patents
竪型ローラミル Download PDFInfo
- Publication number
- WO2018016266A1 WO2018016266A1 PCT/JP2017/023168 JP2017023168W WO2018016266A1 WO 2018016266 A1 WO2018016266 A1 WO 2018016266A1 JP 2017023168 W JP2017023168 W JP 2017023168W WO 2018016266 A1 WO2018016266 A1 WO 2018016266A1
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- Prior art keywords
- ring
- contracted
- housing
- roller mill
- flow
- 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
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/02—Arrangement of air or material conditioning accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/04—Control arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/06—Feeding or discharging arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/01—Selective separation of solid materials carried by, or dispersed in, gas currents using gravity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
Definitions
- the present disclosure relates to a vertical roller mill.
- This application claims priority based on Japanese Patent Application No. 2016-143225 filed in Japan on July 21, 2016 and PCT / JP2017 / 003350 filed internationally on January 31, 2017. Is hereby incorporated by reference.
- Boiler fuel is mainly coal, but recently, as a measure to reduce carbon dioxide, it has been studied to use woody biomass that is renewable and has a low environmental impact as fuel. In order to use woody biomass as fuel for the boiler, it is necessary to pulverize the woody biomass hardened into pellets to a size that can be burned by a burner.
- the biomass mill described in Patent Document 1 is based on a coal roller mill for pulverizing coal, and is configured to pulverize woody biomass at a low cost without major improvements or major equipment changes.
- the woody biomass is lighter than coal and is entangled with each other in the form of fibers, so that the woody biomass tends to stay in the housing by ascending while turning in the housing.
- the biomass mill described in Patent Document 1 includes a reduced flow cylinder having a circular head around a chute for supplying woody biomass, and an air current ejected from the periphery of the crushing table between the cylindrical part and the housing.
- a reduced flow path that reduces the area of the flow path is formed, the flow velocity of the airflow is increased, and the discharge of the woody biomass is improved.
- Patent Document 2, Patent Document 3, Patent Document 4, and Patent Document 5 also disclose saddle type roller mills.
- the present disclosure has been made in view of the above circumstances, and provides a vertical roller mill capable of suppressing the passage of uncrushed material through a reduced flow path at a predetermined flow rate at which woody biomass can appropriately pass through the reduced flow path. With the goal.
- a first aspect of the present disclosure includes a housing, a chute that supplies an object to be crushed to the center of the housing, a pulverization unit that is provided below the chute and pulverizes the object to be crushed, and is provided above the pulverization unit.
- a vertical roller mill having a discharge pipe and a transport mechanism for forming an air flow for transporting the pulverized material pulverized in the pulverization section to the discharge pipe, and a flow path of the air flow between the pulverization section and the discharge pipe
- the reduced flow path has a reduced flow path, and the reduced flow path includes a first reduced flow ring provided at the center of the housing, and a second reduced flow provided from the housing toward the central portion of the housing. And a constricted ring.
- the contracted flow path includes a first contracted ring provided at the center of the housing, and a second contracted ring provided to protrude from the housing toward the center of the housing; Formed between. That is, the contracted flow path is formed in a ring shape in a region inside the housing.
- the flow velocity of the airflow in the contracted flow channel depends on the size of the channel area of the contracted flow channel.
- the contracted flow path having a predetermined flow path area is formed in the inner region of the housing as in the present disclosure, the radius of the contracted flow path is reduced, and the gap size of the reduced flow path is ensured to be large. Therefore, the passage phenomenon of the unground product through the contracted flow path can be suppressed. Therefore, in the present disclosure, it is possible to suppress passage of the unground product through the contracted flow channel at a predetermined flow rate.
- FIG. 1 is a schematic configuration diagram of a vertical roller mill 1 according to an embodiment of the present disclosure.
- FIG. 2 is an enlarged view of a main part of the vertical roller mill 1 in the embodiment of the present disclosure.
- the vertical roller mill 1 according to the present embodiment pulverizes woody biomass (a material to be crushed) hardened in a pellet form, and discharges it on an air stream. 1 indicates the flow of pellets (objects to be crushed), and the arrow indicated by F indicates an air flow.
- the vertical roller mill 1 includes a housing 2, a chute 3 that supplies a material to be crushed to the center of the housing 2, a pulverization unit 4 provided inside the housing 2, and a pulverization unit 4.
- a discharge pipe 9 provided above, a transport mechanism 6 for air-transporting the pulverized material to the discharge pipe 9, and a first reduced flow ring 20 and a second reduced flow ring 30 described later are provided.
- the housing 2 has a substantially cylindrical shape that is erected along the vertical direction, and has a lid 7 that covers the upper opening of the housing 2.
- a cylindrical chute 3 is inserted through the center of the lid body 7.
- the chute 3 is arranged along the vertical direction, the upper opening of the chute 3 is arranged outside the lid body 7, and the lower opening of the chute 3 is arranged below the rotary classifier 5 inside the housing 2.
- a pellet supply device (not shown) is connected to the upper opening of the chute 3, whereby a predetermined amount of woody biomass pellets (material to be crushed) is supplied into the housing 2.
- a rotating classifier 5 is attached to the back side of the lid 7.
- a large number of rotary classification blades 8 are arranged at equal intervals in the circumferential direction of the rotary rotor on a rotary rotor (not shown) provided at the center of the lid body 7.
- the rotary classifier 5 rotates the rotary classifying blade 8 at a predetermined rotation speed by rotating a rotary rotor by a driving device (not shown).
- the crushing unit 4 includes a rotary table 11 provided at the bottom of the housing 2 and a plurality of crushing rollers 12 that roll on the rotary table 11.
- the turntable 11 rotates at a low speed on a horizontal plane.
- the crushing roller 12 is brought into pressure contact with the rotary table 11 by a roller pressure device, and rotates on the rotary table 11 when the rotary table 11 rotates in this state.
- the crushing unit 4 having such a configuration rotates the pellet (subject to be crushed) supplied from the chute 3 to the center of the rotary table 11 on the rotary table 11 by centrifugal force acting on the pellet (subject to be crushed). It moves to the outer peripheral side of the table 11, a pellet (to-be-ground material) is bitten between the upper surface of the rotary table 11 and the crushing roller 12, and the pellet (to-be-ground material) is pulverized by compressive force and shearing force.
- the transport mechanism 6 includes an air introduction part 13 provided on the bottom side surface of the housing 2 and air introduction means (not shown) for introducing external air from the introduction port 13 a of the air introduction part 13.
- air introduction means not shown
- Such a transport mechanism 6 guides air to the outer edge portion of the turntable 11 by the air introduction means, and then raises the inside of the housing 2 to flow into the discharge pipe 9.
- the transport mechanism 6 generates an air flow from the bottom of the housing 2, that is, the rotary table 11, toward the upper portion of the housing 2, that is, the discharge pipe 9. transport.
- Such a vertical roller mill 1 has a contracted flow path 10 between the pulverizing section 4 and the discharge pipe 9 for reducing the flow area of the air flow.
- the contracted flow path 10 increases the flow rate of the air flow and improves the discharge of large pulverized material (woody biomass) that tends to stay in the housing 2.
- the contracted flow path 10 includes a first contracted ring 20 provided at the center of the housing 2, and a second contracted ring 30 provided protruding from the housing 2 toward the center of the housing 2. , Is formed between.
- the first contracted ring 20 is provided around the chute 3.
- the first contracted ring 20 is provided in a region from the lower end of the rotary classifier 5 to the lower part of the chute 3.
- the first contracted ring 20 protrudes (swells) radially outward of the housing 2 from the chute 3 toward the inner wall 2 a of the housing 2.
- the second contraction ring 30 is provided on the inner wall 2 a of the housing 2.
- the second contraction ring 30 is provided at a height that can be opposed to the first contraction ring 20 in the radial direction of the housing 2.
- the second contracted ring 30 protrudes (swells) radially inward of the housing 2 from the inner wall 2 a of the housing 2 toward the chute 3.
- the upper part of at least one of the first contracted ring 20 and the second contracted ring 30 (both in the present embodiment) is inclined downward so as to approach the other.
- Surfaces 21 and 31 are formed. That is, the inclined surface 21 is formed in the upper part of the 1st contraction ring 20 (one), and inclines below so that the 2nd contraction ring 30 (other) may be approached. Further, the inclined surface 31 is formed on the upper part of the second current-reducing ring 30 (one side) and is inclined downward so as to approach the first current-reducing ring 20 (the other).
- the second contraction ring 30 has an inner diameter larger than the outer diameter of the first contraction ring 20. That is, the second contraction ring 30 faces the first contraction ring 20 with a gap W in the radial direction of the housing 2. This gap W becomes the contracted flow path 10.
- the gap W is also referred to as a gap W of the contracted flow path.
- the contracted flow channel 10 is formed in a region outside the half of the radius of the housing 2.
- the inner diameter of the second contracted ring 30 is smaller than the diameter of the inner wall 2 a of the housing 2. That is, the contracted flow channel 10 is formed in a region inside the inner wall 2 a of the housing 2.
- the inclined surface 31 formed on the second contracted ring 30 is inclined downward so as to approach the central portion of the housing 2 from the inner wall 2a of the housing 2.
- the inclined surfaces 21 and 31 are formed at angles ⁇ 1 and ⁇ 2 that are equal to or greater than the repose angle of the pulverized material.
- the angles ⁇ 1 and ⁇ 2 are each formed at an angle of 60 °.
- the angles ⁇ 1 and ⁇ 2 may be different angles as long as the angles are equal to or greater than the repose angle of the pulverized product.
- the opposing surfaces 22 and 32 of the first contracted ring 20 and the second contracted ring 30 are formed flat.
- the facing surface 22 formed on the first contracted ring 20 extends a predetermined distance downward from the lower end of the inclined surface 21.
- the facing surface 32 formed on the second contracted ring 30 extends a predetermined distance vertically downward from the lower end of the inclined surface 31. That is, the opposing surfaces 22 and 32 are formed in parallel to have a predetermined distance.
- inclined surfaces 23 and 33 that are inclined downward so as to be separated from the other are formed. ing. That is, the inclined surface 23 is formed in the lower part of the 1st contraction ring 20 (one), and inclines below so that it may space apart from the 2nd contraction ring 30 (the other). Further, the inclined surface 33 is formed at the lower portion of the second contracted ring 30 (one side) and is inclined downward so as to be separated from the first contracted ring 20 (the other).
- the inclined surface 23 is formed from the lower end of the opposing surface 22 to the lower portion of the chute 3.
- the inclined surface 33 is formed from the lower end of the facing surface 32 to the inner wall 2 a of the housing 2.
- the inclined surfaces 23 and 33 are formed at angles ⁇ 1 and ⁇ 2 from the lower ends of the opposing surfaces 22 and 32, respectively.
- the angles ⁇ 1 and ⁇ 2 are each formed at an angle of 45 °.
- the angles ⁇ 1 and ⁇ 2 may be different from each other.
- FIG. 3 is a graph showing the relationship between the flow velocity of the pellet (pulverized product) and the pipe diameter / pellet length. This graph shows the test results of a pellet blowing test in which the pellet length and the pipe diameter were changed and the flow rate at which unground pellets floated was evaluated.
- the levitation flow rate a is a flow rate at which uncrushed pellets can pass through the contracted flow channel 10. That is, by setting the levitation flow velocity a or less, for example, the pellet returns to the pulverization unit 4 without passing through the contracted flow path 10, and the pellets are returned to the first contracted ring 20 and the second contracted ring 30. It is possible to prevent the product from staying at the top of the substrate.
- the ascent flow velocity becomes a substantially constant ascent flow velocity a (target value). It can be seen that when the ratio is less than the predetermined value b, the unpulverized pellets float up even if the flying speed is slower than the flying speed a. This is because when the length of the pellet approaches the pipe diameter, that is, the size of the gap W between the first current reduction ring 20 and the second current reduction ring 30 shown in FIG. This is because an unmilled material passing through the contracted flow channel 10 that passes through the flow channel 10 occurs.
- the vertical roller mill 1 of the present embodiment includes a first flow-reducing ring 20 provided in a central portion of the housing 2 and a first flow-reducing ring 20 provided in the central portion of the housing 2. And a second contracted ring 30 provided so as to protrude toward the surface. That is, the contracted flow channel 10 is formed in a ring shape in a region inside the housing 2. The flow velocity of the airflow in the contracted flow channel 10 depends on the size of the channel area of the contracted flow channel 10. As shown in Patent Document 1, when the contracted flow channel 10 having a predetermined channel area is formed along the inner wall 2a of the housing 2, the radius of the contracted flow channel 10 is increased, and the gap between the contracted flow channels 10 is increased.
- the dimension of W becomes small, and the passage phenomenon of the unground product through the contracted flow path 10 is likely to occur.
- the contracted flow channel 10 having a predetermined channel area is formed in the inner region of the housing 2 as in the present embodiment, the radius of the contracted flow channel 10 is reduced, and the gap of the contracted flow channel 10 is reduced.
- a large dimension of W can be secured. That is, it becomes easy to design the ratio of the pipe diameter (gap W) / pellet length to be equal to or greater than the predetermined value b, and as a result, the passage phenomenon of the unground product through the contracted flow channel 10 can be suppressed.
- the pulverized material pulverized in the pulverization unit 4 rides on the air flow generated by the transport mechanism 6 and is carried from the rotary table 11 of the pulverization unit 4 to the upper portion of the housing 2.
- a swirl component is imparted, and the airflow flows along the inner wall 2a of the housing 2 by the centrifugal force acting on the swirling airflow, and as a result rises in the vicinity of the inner wall 2a.
- this airflow rises to some extent along the inner wall 2 a of the housing 2, the airflow is guided to the contracted flow path 10 by the inclined surfaces 23 and 33 below the first contracted ring 20 and the second contracted ring 30. Therefore, without increasing the power of the transport mechanism 6, it is possible to increase the flow rate of the airflow and increase the discharge of the woody biomass.
- inclined surfaces 21 and 31 are formed on the upper portions of the first current reducing ring 20 and the second current reducing ring 30. According to this configuration, among the pulverized material that has passed through the contracted flow channel 10, for example, pulverized material that has deviated from the air flow is accumulated on the upper portions of the first contracted ring 20 and the second contracted ring 30. Can be prevented. Further, as in the present embodiment, the inclined surfaces 21 and 31 are formed at angles ⁇ 1 and ⁇ 2 that are equal to or greater than the repose angle of the pulverized product, so that the upper portions of the first and second contracted rings 20 and 30 are formed. It is possible to more reliably eliminate the accumulation of pulverized material.
- the opposing surfaces 22 and 32 of the first current reducing ring 20 and the second current reducing ring 30 are formed flat. Since the first current-reducing ring 20 and the second current-reducing ring 30 are separate members and are attached to different structures (chute 3 and housing 2), the first current-reducing ring 20 and the second current-reducing ring 20 An error is likely to occur in the mounting height of the two contracted rings 30. However, by forming the opposing surfaces 22 and 32 of the first contracted ring 20 and the second contracted ring 30 flat, a slight error in the mounting height can be allowed, and the contracted flow channel having a constant width. 10 can be formed appropriately.
- the present embodiment described above includes the housing 2, the chute 3 for supplying the object to be crushed to the center of the housing 2, the crushing part 4 provided below the chute 3 and crushing the object to be crushed,
- a vertical roller mill 1 having a discharge pipe 9 provided above the pulverization unit 4 and a transport mechanism 6 for forming an air flow for transporting the pulverized material pulverized by the pulverization unit 4 to the discharge pipe 9 is disclosed.
- the vertical roller mill 1 has a contracted flow channel 10 for reducing the flow area of the airflow between the pulverization unit 4 and the discharge pipe 9, and the contracted flow channel 10 is provided at the center of the housing 2.
- the flow rate of the airflow passing through the contracted flow channel 10 is set to the levitation flow rate a or less, whereby passage of the unpulverized pellets through the contracted flow channel 10 can be suppressed.
- FIG. 4 is a schematic configuration diagram of a vertical roller mill 1A according to a modification of the embodiment of the present disclosure.
- an inverted conical guide 25 is provided around the lower opening of the chute 3, and the first flow-reducing ring 20 disposed above the guide 25 rotates together with the rotary classifier 5. That is, the first contracted ring 20 is attached to the rotary classifier 5.
- the guide 25 the first contracted ring 20 can be reduced in weight.
- FIG. 5 is a schematic configuration diagram of a vertical roller mill 1B according to a modification of the embodiment of the present disclosure.
- the vertical roller mill 1 ⁇ / b> B has an adjustment mechanism 40 that adjusts the gap size between the first flow-reducing ring 20 and the second flow-reducing ring 30.
- the adjustment mechanism 40 is an elevating mechanism, which moves the second contraction ring 30 up and down, and inclines the lower part of the second contraction ring 30 on the inclined surface 21 on the upper part of the first contraction ring 20. By aligning the surface 33 at an angle, the gap size between the first contraction ring 20 and the second contraction ring 30 is adjusted.
- the gap when the flow rate of the airflow is increased, the gap is widened by raising and lowering the second contraction ring 30 so that the gap flow velocity in the contracted flow channel 10 does not increase more than necessary.
- the gap can be narrowed by raising and lowering the second reduced flow ring 30 so that the gap flow velocity in the reduced flow channel 10 does not drop more than necessary.
- the adjustment mechanism 40 can finely adjust the gap flow velocity.
- the contracted flow path 10 is not necessary, and therefore the second contracted ring 30 is raised to a position not facing the first contracted ring 20. If the gap flow velocity is reduced, it is possible to switch between woody biomass and coal crushing.
- FIG. 6 is a schematic configuration diagram of a vertical roller mill 1C according to a modification of the embodiment of the present disclosure.
- the adjusting mechanism 40 of the vertical roller mill 1 ⁇ / b> C adjusts the gap size between the first current reducing ring 20 and the second current reducing ring 30 by moving the first current reducing ring 20 up and down.
- the first contracted ring 20 can move up and down together with the rotary classifier 5. That is, the rotary classifier 5 can move up and down along the chute 3 together with the bearing.
- this configuration when coal is pulverized, operation is performed at a normal position (a high position indicated by a solid line in FIG. 6), and when pulverizing woody biomass, the rotary classifier 5 is lowered, and 2 in FIG.
- the gap flow velocity can be adjusted similarly to the configuration shown in FIG. For this reason, even when changing fuel from coal to woody biomass and woody biomass to coal, it can be handled without remodeling the mill, reducing or eliminating the mill stoppage time when changing fuel. it can.
- the position of the rotary classifier 5 may be manually adjusted from the inside of the mill, but the position may be changed from the outside by a motor or the like so that the condition during operation can be finely adjusted. .
- FIG. 7 is a plan sectional view of a vertical roller mill 1D according to a modification of the embodiment of the present disclosure.
- the adjusting mechanism 40 of the vertical roller mill 1D includes a first plate member 41 attached in a layered manner to the outer periphery of the first current reducing ring 20 and a first attached to the inner periphery of the second current reducing ring 30 in a layered manner. 2 plate members 42.
- the first plate member 41 and the second plate member 42 are attached to and detached from the outer periphery of the first current-reducing ring 20 and the inner periphery of the second current-reducing ring 30 by an adhesive or spot welding. Easy to do. According to this configuration, the size of the gap W of the contracted flow channel 10 can be easily changed according to the operating conditions.
- FIG. 8 is a schematic configuration diagram of a vertical roller mill 1E according to a modification of the embodiment of the present disclosure.
- the vertical roller mill 1E is not provided with the rotary classifier 5.
- a distributor 50 to which a discharge pipe 9 is connected is provided at the upper part of the housing 2.
- the distributor 50 includes a distribution space 51 through which the discharge pipe 9 communicates, and a chute holding portion 52 that is inserted above and below the center of the distribution space 51.
- the distribution space 51 is an annular space formed in the shape of an inverted truncated cone around the chute holding portion 52, and the discharge pipe 9 is connected to the upper surface thereof.
- the chute holding part 52 is a cylindrical part extending vertically downward from the lid body 7 and is fixed to the outer peripheral surface of the chute 3.
- the distributor 50 having the above-described configuration is provided with the first contracted ring 20.
- the first contracted ring 20 is connected to the lower end of the chute holding part 52.
- the second contracted ring 30 may also be provided in the distributor 50.
- the second contracted ring is formed on the boundary wall 53 arranged at the boundary between the inverted frustoconical distribution space 51 of the distributor 50 and the cylindrical inner space of the housing 2 communicating with the lower part of the distribution space 51. 30 may be connected.
- the first current-reducing ring 20 may be disposed apart from the distributor 50.
- both are integrated so that the boundary wall 52 becomes the second contracted ring 30, and both are integrated so that the first contracted ring 20 protrudes from the outer peripheral surface of the chute holding portion 52. May be. That is, the distributor 50 is provided with at least one of the first contracted ring 20 and the second contracted ring 30.
- woody biomass exhibits combustibility comparable to that of coal (pulverized coal) of several tens of ⁇ m with a particle size of about 1 mm. For this reason, if the woody biomass can be discharged from the vertical roller mill 1E in a rough state without being finely pulverized, the pulverizing capacity of the vertical roller mill 1E can be increased. For this reason, when pulverizing woody biomass, the rotary classifier 5 may be stopped, or the rotary classifier 5 may be deleted as in the vertical roller mill 1E. By eliminating the rotary classifier 5, the distributor 50 can be provided with at least one of the first reduced flow ring 20 and the second reduced flow ring 30.
- the height of the vertical roller mill 1E can be reduced by the amount that the rotary classifier 5 is deleted. If the height of the vertical roller mill 1E is reduced, for example, the steel frame of the entire boiler building (not shown) covering the vertical roller mill 1E can be reduced. Further, by eliminating the rotary classifier 5, the motor, rotor, and bearing for driving the rotary classifier 5 become unnecessary, so that the weight of the vertical roller mill 1E can be reduced. As a result, the cost of the entire facility can be reduced. As mentioned above, although preferred embodiment and its modification of this indication were described, referring to drawings, this indication is not limited to the above-mentioned embodiment and its modification. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiment and its modifications are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present disclosure.
- the vertical roller mill of the present disclosure it is possible to suppress passage of the unground product through the contracted flow path at a predetermined flow rate at which the woody biomass can appropriately pass through the contracted flow path.
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Abstract
Description
本願は、2016年7月21日に日本国に出願された特願2016-143225号及び2017年1月31日に国際出願されたPCT/JP2017/003350号に基づき優先権を主張し、その内容をここに援用する。
なお、特許文献2、特許文献3、特許文献4、特許文献5にも竪型ローラミルが開示されている。
したがって、本開示では、所定の流速での未粉砕物の縮流流路の通過を抑制することができる。
本実施形態の竪型ローラミル1は、ペレット状に固めた木質系バイオマス(被粉砕物)を粉砕し、気流に乗せて排出する。図1に符号Pで示す矢印は、ペレット(被粉砕物)の流れを示し、符号Fで示す矢印は気流を示す。
回転テーブル11は、水平面上にて低速で回転する。
粉砕ローラ12は、ローラ加圧装置によって回転テーブル11に圧接させられ、その状態で回転テーブル11が回転することにより、回転テーブル11上を転動する。
本実施形態では、角度β1,β2がそれぞれ45°の角度で形成されている。なお、角度β1,β2は、互いに異なる角度であってもよい。
浮上流速aは、未粉砕のペレットが縮流流路10を通過できる流速である。すなわち、浮上流速a以下とすることで、例えば、ペレットが縮流流路10を通過せずに粉砕部4に戻り、また、ペレットが第1の縮流リング20及び第2の縮流リング30の上部に滞留することが生じないようにすることができる。
竪型ローラミル1Aでは、シュート3の下部開口の周囲に倒立円錐形のガイド25が設けられ、ガイド25の上方に配置された第1の縮流リング20が回転分級機5と共に回転する。すなわち、第1の縮流リング20は、回転分級機5に取り付けられている。このように、ガイド25を設けることによって、第1の縮流リング20を軽量化することができる。
竪型ローラミル1Bでは、第1の縮流リング20と第2の縮流リング30との隙間寸法を調節する調節機構40を有する。調節機構40は、昇降機構であって、第2の縮流リング30を上下に移動させ、第1の縮流リング20の上部の傾斜面21に、第2の縮流リング30の下部の傾斜面33を斜めに合わせることにより、第1の縮流リング20と第2の縮流リング30との隙間寸法を調節する。この構成によれば、気流の流量を上げる際、縮流流路10における隙間流速が必要以上に上がらないように第2の縮流リング30を上下して隙間を広げ、また、気流の流量を下げる際、縮流流路10における隙間流速が必要以上に下がらないように第2の縮流リング30を上下して隙間を狭めることができる。また、粉砕するペレットの種類を変更した場合も最適な隙間流速が変わることが考えられるが、調節機構40によって隙間流速の微調整をすることが可能となる。さらに、運転中のミル差圧に応じて第2の縮流リング30の位置を調整できるように、調節機構40を外部から制御する構成を採用してもよい。また、木質系バイオマスではなく、通常の石炭を粉砕する際は、縮流流路10は不要となるため、第2の縮流リング30を第1の縮流リング20と対向しない位置まで上昇させて隙間流速を下げれば、木質系バイオマスと石炭の粉砕の切り替えも可能である。
竪型ローラミル1Cの調節機構40は、第1の縮流リング20を上下動させることにより、第1の縮流リング20と第2の縮流リング30との隙間寸法を調節する。この第1の縮流リング20は、回転分級機5と共に上下動できる。すなわち、回転分級機5は、軸受けと共にシュート3に沿って上下動できる。この構成によれば、石炭の粉砕時は、通常の位置(図6で実線で示す高い位置)で運転を行い、木質系バイオマスの粉砕時は、回転分級機5を下げて、図6に2点鎖線で示すように、図5に示す構成と同様に隙間流速を調整することができる。このため、石炭から木質系バイオマス、木質系バイオマスから石炭に燃料を変更する際も、ミルの改造を行なわずに対応ができ、燃料を変更する際のミルの停止期間を減らす、あるいは無くすことができる。なお、回転分級機5は、ミル内部から手動で位置を調節してもよいが、運転中の条件の微調整が可能となるように、外部からモータ等で位置を変更できるようにしても良い。
竪型ローラミル1Dの調節機構40は、第1の縮流リング20の外周に層状に取り付けられた第1の板部材41と、第2の縮流リング30の内周に層状に取り付けられた第2の板部材42と、から構成されている。第1の板部材41と第2の板部材42は、接着剤や点溶接などにより、第1の縮流リング20の外周と第2の縮流リング30の内周に、取り付け、及び、取り外しがしやすい。この構成によれば、運転条件に応じて縮流流路10の隙間Wの寸法を容易に変更することができる。これにより、運転条件を変える場合、小規模な改造(板の取り付け、及び、取り外し)で済み、工事が短時間で完了する。また、運転条件に合わせて複数の縮流リングを製作する必要がないため、初期コストは少し上がるものの全体のコスト削減になる。さらに、第1の縮流リング20の外周及び第2の縮流リング30の内周は粉砕物が通るため、摩耗が懸念されるが、この摩耗が生じた際も、板を取り外して板のみを交換すればよいため、短い期間で修理や交換が可能となる。
竪型ローラミル1Eには、回転分級機5が設けられていない。ハウジング2の上部には、排出管9が接続された分配器50が設けられている。分配器50は、排出管9が連通する分配空間51と、分配空間51の中央の上下に挿通されたシュート保持部52と、を有する。分配空間51は、シュート保持部52の周囲に逆円錐台状に形成された環状空間であり、その上面に排出管9が接続されている。シュート保持部52は、蓋体7から鉛直下方に延びる筒状部分であり、シュート3の外周面と固定されている。
以上、図面を参照しながら本開示の好適な実施形態とその変形例について説明したが、本開示は上記実施形態とその変形例に限定されない。上述した実施形態とその変形例において示した各構成部材の諸形状や組み合わせ等は一例であって、本開示の主旨から逸脱しない範囲において設計要求等に基づき種々変更可能である。
2 ハウジング
3 シュート
4 粉砕部
5 回転分級機
6 輸送機構
9 排出管
10 縮流流路
20 第1の縮流リング
21 傾斜面
22 対向面
30 第2の縮流リング
31 傾斜面
32 対向面
40 調節機構
50 分配器
W 隙間
α1 角度
α2 角度
β1 角度
β2 角度
Claims (9)
- ハウジングと、前記ハウジングの中心部に被粉砕物を供給するシュートと、前記シュートの下方に設けられて前記被粉砕物を粉砕する粉砕部と、前記粉砕部の上方に設けられた排出管と、前記粉砕部で粉砕された粉砕物を前記排出管に輸送する気流を形成する輸送機構と、を有する竪型ローラミルであって、
前記粉砕部と前記排出管との間に、前記気流の流路面積を絞る縮流流路を有し、
前記縮流流路は、前記ハウジングの中心部に設けられた第1の縮流リングと、前記ハウジングから前記ハウジングの中心部に向かって突出して設けられた第2の縮流リングと、の間に形成されている竪型ローラミル。 - 前記第1の縮流リング及び前記第2の縮流リングの少なくともいずれか一方の上部には、他方に接近するように下方に傾斜する傾斜面が形成されている請求項1に記載の竪型ローラミル。
- 前記傾斜面は、前記粉砕物の安息角以上の角度で形成されている請求項2に記載の竪型ローラミル。
- 前記第1の縮流リングと前記第2の縮流リングとの対向面は、フラットに形成されている請求項1~3のいずれか一項に記載の竪型ローラミル。
- 前記第1の縮流リングと前記第2の縮流リングとの隙間寸法を調節する調節機構を有する請求項1~3のいずれか一項に記載の竪型ローラミル。
- 前記粉砕部の上方に、回転分級機が設けられており、
前記第1の縮流リングが、前記回転分級機と共に回転する請求項1~3のいずれか一項に記載の竪型ローラミル。 - 前記第1の縮流リングと前記第2の縮流リングとの隙間寸法を調節する調節機構を有する請求項4に記載の竪型ローラミル。
- 前記粉砕部の上方に、回転分級機が設けられており、
前記第1の縮流リングが、前記回転分級機と共に回転する請求項4に記載の竪型ローラミル。 - 前記ハウジングの上部に前記排出管が接続された分配器が設けられており、
前記分配器に、前記第1の縮流リング及び前記第2の縮流リングの少なくともいずれか一方が設けられている請求項1~3のいずれか一項に記載の竪型ローラミル。
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