WO2015049912A1 - 竪型ローラミル - Google Patents

竪型ローラミル Download PDF

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Publication number
WO2015049912A1
WO2015049912A1 PCT/JP2014/069859 JP2014069859W WO2015049912A1 WO 2015049912 A1 WO2015049912 A1 WO 2015049912A1 JP 2014069859 W JP2014069859 W JP 2014069859W WO 2015049912 A1 WO2015049912 A1 WO 2015049912A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
rotary
installation angle
plate
roller mill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2014/069859
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
卓一郎 大丸
有馬　謙一
松本　慎治
菅　啓史
串岡　清則
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Power Ltd
Original Assignee
Mitsubishi Hitachi Power Systems Ltd
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 Mitsubishi Hitachi Power Systems Ltd filed Critical Mitsubishi Hitachi Power Systems Ltd
Publication of WO2015049912A1 publication Critical patent/WO2015049912A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B02C15/007—Mills with rollers pressed against a rotary horizontal disc
    • 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
    • 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
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Definitions

  • the present invention relates to a vertical roller mill applied to, for example, a pulverized coal-fired boiler, and more particularly to a vertical roller mill equipped with a rotary classifier.
  • pulverized coal machine such as a vertical roller mill 10 shown in FIG. 3 and pulverized pulverized coal is used as a fuel.
  • the grinding roller 13 turns while rotating on the grinding table 12 installed at the lower part in the housing 11.
  • symbol 14 in a figure is a coal input pipe which inject
  • the raw material carbon introduced into the vertical roller mill 10 is pulverized by being caught between the pulverizing table 12 and the pulverizing roller to be pulverized coal.
  • the pulverized coal is air-borne and transported to a rotary classifier 20 disposed above the inside of the housing 11 while being dried by hot air jetted from a throat (not shown) disposed around the grinding table 12.
  • a rotary classifier 20 disposed above the inside of the housing 11 while being dried by hot air jetted from a throat (not shown) disposed around the grinding table 12.
  • coarse particles having a large particle diameter are subjected to gravity classification which is dropped by gravity and returned to the crushing table 12, and therefore, the particles are repeatedly crushed until a desired particle diameter is obtained.
  • pulverized coal of product particles including coarse particles is further classified by the rotary classifier 20 disposed on the top of the grinding table 12.
  • a classifier in addition to the rotary classifier 20, there is also a stationary type or a combination of a stationary type and a rotary type.
  • the rotary classifier 20 performs classification by collision and inertial force by plate-like rotary blades, and is known to have high classification performance.
  • the pulverized coal which has been carried by air flow is dried by hot air and is further classified by passing through a rotary classifier 20.
  • the classified pulverized coal passes through the pulverized coal outlet 15 communicating from the inside to the outside of the housing 11 from the inside of the rotary classifier 20, and is airflow-carried to the boiler by the primary air for conveyance.
  • the rotary classifier 20 includes a large number of plate-like rotary vanes 22 arranged at equal intervals in the circumferential direction of the cone 21 rotating in the arrow direction (clockwise).
  • the plate-like rotary vanes 22 are flat plate-like members installed so as to have an inclination angle ⁇ in the same direction. Note that the inclination angle ⁇ in this case is with respect to the tangent L of the circular locus along which the cone 21 rotates. As a result, a large number of inlet openings 23 penetrating the wall surface of the cone 21 are formed between the adjacent plate-like rotary vanes 22.
  • the inlet opening 23 serves as an inlet and a flow passage through which a flow for conveying pulverized coal by air flow (hereinafter, referred to as “solid-gas two-phase flow”) passes and flows into the inside of the cone 21. Further, inside the cone 21, a wall surface 24 opposed to the inlet opening 23 is provided.
  • the angle of the blade differs between the upper side and the lower side, that is, from the lower side in the side view Some have an inclination angle that increases in diameter toward the upper side.
  • Patent Document 2 there is one in which the shape of the rotary blade is made wider at the upper portion than at the lower portion, and the coarse particle collision probability with the blade is made uniform in the upper and lower direction.
  • the fineness of pulverized coal pulverized by a pulverizer such as the vertical roller mill 10 is generally expressed by 200 # pass (particle ratio of 75 ⁇ m or less) and has a good correlation with the power required for the pulverization.
  • the unburned content when pulverized coal is supplied to the boiler has a high correlation with 100 # remaining (particle ratio of 150 ⁇ m or more).
  • the proportion of pulverized coal coarse particles having a residual amount of 100 # which is about 100 mesh or more, means the ratio of coarse particles in product pulverized coal which adversely affects the combustibility. Therefore, it is necessary for the vertical type roller mill 10 for coal crushing applied to the pulverized coal burning boiler etc. to minimize the 100 # remaining to the 200 # pass.
  • the rotary classifier 20 rotates the cone 21 of the rotating body provided with the plate-like rotary vanes 22 and separates coarse particles by colliding them with the plate-like rotary vanes 22.
  • a flat plate is used for the blade 22.
  • the conventional plate-like rotary vanes 22 are inclined (angle ⁇ ) in the direction in which particles collide with and repel the plate-like rotary vanes 22 with respect to the rotational direction, and are also inclined in the height direction. For this reason, if the width of the plate-like rotary vanes 22 is constant in the vertical direction, the rotational peripheral speed is different in the height (vertical direction) direction, and the probability that the particles collide is different in the height direction. For this reason, as shown in Patent Document 2, the width of the plate-like rotary vane 22 is increased at a portion where the radius of the rotary classifier 20 becomes large.
  • the above-described conventional plate-like rotary vanes 22 have different rotational peripheral speeds in the height direction, so, for example, as shown in FIG. An air flow containing a large amount of air easily enters from the lower side of the plate-like rotary vanes 22.
  • the inclination angle ⁇ of the plate-like rotary vanes 22 45 degrees, which has the smallest relation of 100 # remaining to the same 200 # pass, is adopted according to the grinding test result and the like.
  • the inclination angle ⁇ is constant from the upper portion to the lower portion of the blade because the rotary blade 22 is a flat plate.
  • the present invention has been made in view of the above-mentioned circumstances, and the purpose thereof is that in a vertical roller mill equipped with a rotary classifier, the proportion of coarse particles in product pulverized coal (which adversely affects the flammability) 100) to reduce the ratio of 100 # remaining.
  • the present invention adopts the following means in order to solve the above-mentioned problems.
  • the vertical roller mill according to an aspect of the present invention is a rotary classifier that classifies fine powder having a small particle size and discharges it to the outside by passing a solid-gas two-phase flow that conveys powder obtained by pulverizing a solid by gas flow.
  • the rotary type classifier includes a large number of plate-like rotary vanes arranged at equal pitch in the circumferential direction on the peripheral wall surface of the cone-shaped member which rotates in the housing,
  • the plate-like rotary vanes are installed such that the inner side in the radial direction is inclined in the rotational direction with respect to a line orthogonal to the outer tangent of the rotation locus, and the installation angle of the plate-like rotary vanes from the outer tangent is
  • the installation angle ( ⁇ 1) on the upper end side is set to a value ( ⁇ 1> ⁇ 2) larger than the installation angle ( ⁇ 2) on the blade lower end side.
  • the rotary classifier is provided with a large number of plate-like rotary vanes arranged at equal intervals in the circumferential direction on the peripheral wall surface of the cone-shaped member rotating in the housing.
  • the installation is performed by inclining the inside in the radial direction to the direction of rotation with respect to the line orthogonal to the outside tangent of the rotation path, and the installation angle of the plate-like rotary vane from the outside tangent is Since the angle ( ⁇ 1) is set to a value ( ⁇ 1> ⁇ 2) larger than the installation angle ( ⁇ 2) on the lower end of the blade, the lower end of the blade whose installation angle is smaller than the upper end of the blade The angle of attack against the air flow is increased.
  • the plate-like rotary vane has a vane shape obtained by bending a flat plate so that the installation angle ( ⁇ 1) at the upper end of the vane and the installation angle ( ⁇ 2) at the lower end of the vane are different. Is desirable.
  • the plate-like rotary vane has a three-dimensional vane shape formed so that the installation angle ( ⁇ 1) at the upper end of the vane and the installation angle ( ⁇ 2) at the lower end of the vane are different. Is desirable.
  • the installation angle ((alpha) 1) at the said blade upper end part side is set in the range of 20-40 degrees
  • the installation angle ((alpha) 2) at the said blade lower end part side is 40-60 degrees. Is set in the range of
  • the ratio of coarse particles (the ratio of coarse particles exceeding 100 mesh which adversely affects the combustibility) in the product pulverized coal is reduced. It becomes possible. For this reason, if the vertical roller mill of the present invention is applied to a pulverized coal-fired boiler, the ratio of coarse particles in product pulverized coal can be reduced, and the unburned component in ash can be reduced.
  • FIG. 4 it is a figure which shows inflow velocity distribution of the airflow which arises by the resistance difference etc. by a plate-shaped rotary blade. It is a figure which shows the relationship of 200 # pass (%) and 100 # remainder by the difference (45 degrees and 30 degrees) of the inclination angle ((theta)) of a plate-shaped rotary blade.
  • the vertical roller mill 10 shown in FIG. 3 is, for example, an apparatus (pulverized coal machine) for manufacturing pulverized coal to be a fuel of pulverized coal burning boiler.
  • raw material coal is pulverized into pulverized coal, and the pulverized coal after gravity classification is classified by the rotary classifier 20.
  • product fines classified through the rotary classifier 20 are classified as pulverized coal fuel having a desired degree of fineness from the pulverized coal outlet (milled powder outlet) 14 provided on the upper part of the vertical roller mill 10,
  • the air is transported to the pulverized coal-fired boiler by the primary air.
  • the configuration of the vertical roller mill 10 according to this embodiment is the same as that of the prior art described above except for the plate-like rotary vanes 22A of the rotary classifier 20 described later, and therefore the detailed description thereof is omitted.
  • the solid-gas two-phase flow for conveying the pulverized coal (powder) obtained by crushing the raw material coal (solid) in an air flow passes through.
  • the rotary type classifier 20 is provided in the upper part in the housing 11 for classifying the small fine powder of the above by centrifugal force and flowing it out to the pulverized coal burning boiler (outside).
  • the rotary classifier 20 introduces a solid-gas two-phase flow into the interior of the cone from a large number of inlet openings 23 opened in the circumferential wall of a rotating cone (cone-shaped member) 21.
  • the above-described inlet openings 23 are formed between the plate-like rotary vanes 22A, which are arranged at equal pitches in the circumferential direction, with respect to the circumferential wall of the cone 21.
  • the rotary classifier 20 includes a large number of plate-like rotary vanes 22A arranged at equal pitches in the circumferential direction on the peripheral wall surface of the cone 21 rotating in the housing 11, and the adjacent plate-like rotary vanes 22A An inlet opening 23 is formed therebetween.
  • the plate-like rotary vanes 22A include tangents (outside tangents) La and Lb that are on the outer side in a rotation locus formed by rotation of the cone 21 and the plate-like rotary vanes 22A.
  • the inside in the radial direction is inclined in the rotational direction. That is, the plate-like rotary vanes 22A are inclined such that the end side facing the inside of the cone 21 is positioned on the rotational direction side from the line orthogonal to the tangents La and Lb.
  • the installation angle of the plate-like rotary blade 22A is the installation angle (tilt angle) ⁇ 1 at the blade upper end side, the installation angle (tilt angle) at the blade lower end side It is set to a value larger than ⁇ 2 ( ⁇ 1> ⁇ 2).
  • the plate-like rotary blade 22A shown in the drawing is a broken line M in the figure so that the installation angle ⁇ 1 on the blade upper end side and the installation angle ⁇ 2 on the blade lower end portion are different and the installation angle ⁇ 1 on the blade upper end side is large.
  • the blade shape which bent the flat plate is adopted.
  • the broken line M in the figure coincides with the diagonal of the substantially rectangular flat plate.
  • the plate-like rotary blade 22A having the above-described structure has a blade area facing the flow because the attack angle of the plate-like rotary blade 22A against the air flow becomes large on the blade lower end side set at the installation angle ⁇ 2 smaller than the blade upper end side. Will increase. For this reason, on the lower end portion side of the wing, coarse particles flowing in with the air flow easily collide with the wing surface. That is, the coarse particles that easily flowed in from the lower end portion of the plate-like rotary vane 22A due to the formation of the inflow velocity distribution of the air flow easily collide with the surface of the plate-like rotary vane as the angle of attack increases.
  • plate-shaped rotary blade 22A of such a shape turns into a simple blade shape of upper and lower integral, it can be easily manufactured, even if it changes installation angle alpha1 of upper and lower sides alpha2.
  • the plate-like rotary vane 22A may have a three-dimensional vane shape formed so that the installation angle ⁇ 1 on the upper end side of the vane and the installation angle ⁇ 2 on the lower end side of the vane are different.
  • the flat plate is formed into a curved surface or into a shape combining the curved surface and a flat surface so that the installation angle ⁇ 1 on the blade upper end side is larger than the installation angle ⁇ 2 on the blade lower end side 3
  • the plate-like rotary blade 22A described above sets the installation angle ⁇ 1 on the blade upper end side to a range of 40 to 60 degrees, and the blade lower end side It is desirable to set the installation angle ⁇ 2 of the above in the range of 20 to 40 degrees.
  • the vertical roller mill 10 equipped with the rotary classifier 20 according to the present embodiment is coarse-grained which has an adverse effect on the combustibility due to an increase in unburned matter in product pulverized coal. It becomes possible to reduce the ratio, that is, the ratio of 100 # remaining to 200 # pass (particle ratio of 75 ⁇ m or less). For this reason, if the vertical roller mill 10 of the present embodiment is applied to a pulverized coal-fired boiler, the ratio of coarse particles in product pulverized coal can be reduced, and therefore the unburned component in ash can be reduced.
  • FIG. 2 shows the case where the rotation speed of the cone 20 is 110 rpm.
  • pulverized coal is handled as powder
  • the present invention is not limited to the embodiment mentioned above, for example, it is applicable also to powder other than pulverized coal, etc. It can change suitably in the range which does not deviate from a summary.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Disintegrating Or Milling (AREA)
PCT/JP2014/069859 2013-10-01 2014-07-28 竪型ローラミル Ceased WO2015049912A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013206375A JP6275442B2 (ja) 2013-10-01 2013-10-01 竪型ローラミル
JP2013-206375 2013-10-01

Publications (1)

Publication Number Publication Date
WO2015049912A1 true WO2015049912A1 (ja) 2015-04-09

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WO (1) WO2015049912A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112547219A (zh) * 2020-11-17 2021-03-26 山东丰香园食品股份有限公司 一种健神养脑芝麻粉的电动石磨装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109046612B (zh) * 2018-08-23 2023-06-02 南京中材粉体工程科技有限公司 一种立磨用粗粉预分离装置
KR102505661B1 (ko) * 2018-09-26 2023-03-06 사타케 멀티믹스 가부시키가이샤 분급 로터 및 분급 장치

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02142680U (https=) * 1989-04-28 1990-12-04
JP2002177811A (ja) * 2000-12-07 2002-06-25 Babcock Hitachi Kk 固気二相流の分配方法および分配装置ならびに竪型ミル

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2617623B2 (ja) * 1991-01-21 1997-06-04 三菱重工業株式会社 ローラミル
US5957300A (en) * 1996-01-29 1999-09-28 Sure Alloy Steel Corporation Classifier vane for coal mills

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02142680U (https=) * 1989-04-28 1990-12-04
JP2002177811A (ja) * 2000-12-07 2002-06-25 Babcock Hitachi Kk 固気二相流の分配方法および分配装置ならびに竪型ミル

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112547219A (zh) * 2020-11-17 2021-03-26 山东丰香园食品股份有限公司 一种健神养脑芝麻粉的电动石磨装置
WO2022104977A1 (zh) * 2020-11-17 2022-05-27 山东丰香园食品股份有限公司 一种健神养脑芝麻粉的电动石磨装置

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JP2015066544A (ja) 2015-04-13
JP6275442B2 (ja) 2018-02-07

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