EP0409498A2 - Installation de broyage ayant une cuve rotative et des segments de canalisation du flux d'air démontables - Google Patents

Installation de broyage ayant une cuve rotative et des segments de canalisation du flux d'air démontables Download PDF

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Publication number
EP0409498A2
EP0409498A2 EP90307681A EP90307681A EP0409498A2 EP 0409498 A2 EP0409498 A2 EP 0409498A2 EP 90307681 A EP90307681 A EP 90307681A EP 90307681 A EP90307681 A EP 90307681A EP 0409498 A2 EP0409498 A2 EP 0409498A2
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EP
European Patent Office
Prior art keywords
ring
grinding table
segments
pulverizer
segmented
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.)
Granted
Application number
EP90307681A
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German (de)
English (en)
Other versions
EP0409498B1 (fr
EP0409498A3 (en
Inventor
Randall John Novotny
Ralph L. Cummins
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.)
Foster Wheeler Energy Corp
Original Assignee
Foster Wheeler Energy Corp
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Publication date
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Publication of EP0409498A3 publication Critical patent/EP0409498A3/en
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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
    • B02C15/001—Air flow directing means positioned on the periphery of the horizontally rotating milling surface

Definitions

  • This invention pertains to pulverizers of the roll and race type which have a rotatable grinding table containing air port flow passages. It pertains particularly to such pulverizers for coal having a grinding table with multiple replaceable air port segments provided at the table periphery adajcent an outer segmented ring.
  • Pulverizers for coal having a centrally located coal feed conduit and a rotary grinding table and rolls provided in the pulverizer lower portion for pulverizing coal and pneumatically conveying it upwardly to boilers for combustion therein are well known.
  • such pulverizers for coal are disclosed by U.S. Patent No.4,264,041 to Kitto, Jr. et al and U.S. 4,687,145 to Dougan et al.
  • the carrier air passes upwardly from a plenum through air ports containing a plurality of vanes and entrains pulverized coal upwardly from the outer edge of the rotatable grinding ring.
  • This invention provides an improved pulverizer containing a rotatable grinding table having an improved air port configuration, for passing primary air to pulverized material and pneumatically conveying the material such as coal upwardly to a boiler for combustion therein.
  • the air port unit is attached rigidly to the grinding table outer periphery, and includes multiple removable ring segments.
  • Each ring segment of the air port unit consists of a lower part and an upper part, with each part being removably attached to the outer periphery of the grinding table.
  • the ring segments each have air flow passage­ways provided therein, which are each angled radially inwardly by an angle of 10-20° relative to a vertical plane.
  • the flow passages are also each angled forwardly relative to the grinding table direction of rotation at an angle of 40-60° and preferably at about 45° angle with the horizontal plane.
  • the use of a 40-­60° forward angle as compared to a smaller angle of about 30° results in less direct impingement of the entrained coal stream against the housing, which reduces housing erosion.
  • a stationary outer segmented ring is rigidly attached to the inner wall of the pulverizer housing, with a radial gap of 0.100 - 0.190 inches preferably about 0.125 inches being provided between the outer ring wall and the air port rotatable inner ring segments.
  • the outer ring includes multiple segments, with each segment having a lower part rigidly attached to the housing wall as by welding, and an upper part removably attached to the outer ring segment lower part such as by bolting.
  • air port ring multiple segments having replaceable lower and upper parts provides an improved means for matching of the pulverized air port air flow requirements to a particular pulverizer installation.
  • this configuration permits the air port lower segments to be sized to accommodate the larged volumetric air flow for a given pulverizer housing size, and permits the segments upper parts to be sized to provide a desired smaller air flow rate as required to attain the proper air velocity for upward coal transport desired for the particular pulverizer installation.
  • the air port ring segment upper parts openings have flow passages which have betwee about 50-100% of the cross-sectional area of the ring segment lower parts.
  • This invention advtangeously provides a pulverizer having an air port unit for which the ring segments upper parts, which receive the most erosion wear, can be replaced easily and economically without requiring replacement of the entire air port assembly.
  • the air port configuration also advantageously provides for changes in air flow requirements as needed to meet changes in pulverizer operations.
  • a coal pulverizer assembly 10 includes an outer casing 12 which encloses a rotary grinding table 14.
  • the grinding table 14 is usually supported by rollers in a stationary base structure 16, and is rotatable by a pulverizer gear reducer and drive motor 18 within the base 16.
  • Triple equally spaced rollers 20 are pivotably attached to the housing 12 above the rotary grinding table 14. Rollers 20 can each rotate about their own shafts 21 which are pivoted at 22 to housing 12, so that the rollers 20 are each rotated in race 15 and on the coal therein by the rotation of the grinding table 14.
  • the coal feed enters the pulverizer via a central downcomer unit 24 and falls onto a central portion 14a of the rotatable grinding table 14.
  • the three rotatable grinding roller units 20, which each rest on the grinding table race 15 and the coal therein, progressively crushes the coal particles as they are passed radially outwardly across the grinding table 14 towards a plurality of air ports 30 attached to the periphery of the table 14. Air provided from inlet conduit 26 and plenum 27 flows uniformly upwardly through air ports 30 to carry the pulverized coal particles upwardly to the pulverizer classifier vanes 28 and upper exits 29 to a combustion zone.
  • FIG. 2 A plan view of the pulverizer rotatable grinding table 14 and multiple air ports 30 is shown by Fig. 2. It is seen that the multiple peripheral air ports 30 are provided by a segmented ring 32, which is rigidly attached to the periphery of the grinding table 14. The multiple air ports 30 are provided circumferentially spaced apart in the segmented ring 32, which is removably attached to the periphery of grinding table 14 such as by bolting.
  • the segmented ring 32 contains multiple segments 31, with at least 8 arcuate segments and usually not exceeding 20 segments being provided.
  • each ring segment 31 consists of an upper piece 31a and a lower piece 31b.
  • a multi-piece segmented retainer ring 34 is bolted to the periphery 14b of the grinding table 14 by bolts 35. Both the upper piece 31a and the lower piece 31b are bolted to the segmented retainer ring 34 using a staggered bolting arrangement of bolts 37a and 37b.
  • a plurality of passageways 33 are provided through the ring segments 31, with the passageway walls being oriented radially inwardly by an angle A of 10-20° related to a vertical plane, and preferably at an angle of about 15°.
  • a refractory cement material 39 can be provided in any gap between upper part 31a and rotatable table 14.
  • An outer stationary ring 40 has a plurality of segments rigidly attached to the pulverizer housing 12 such as by welding, so as to provide a radial gap 42 between the outer ring 40 and the air port segmented ring 32.
  • the radial gap 42 should be 0.100 - 0.190 inches wide and is preferably about 0.125 inches wide.
  • a plurality of upper wear segments 41 are removably attached by bolts 43 onto the upper surface of the outer ring segments 40.
  • the outer ring segments 40 consist of a vertically oriented plate 40b and cover 40a which are both welded together and also welded to the pulverizer housing wall 12.
  • the segmented upper parts 41 are bolted onto the lower part cover 40a by at least three spaced apart bolts 43 per segment.
  • the outer stationary ring 40 includes at least 8 segments and usually not exceeding 20 segments. If desired, a refractory cement material 44 may be provided between the cover 40a and vertical plate 40b and housing 12. Also, a refractory cement material 45 may be provided between upper wear segments 41 and housing 12.
  • the orientation and size of the air port flow passages 33 in ring 32 is further shown by Fig. 4.
  • the flow passages 33 are all angled forwardly, i.e. in the direction of rotation of the grinding ring 14, by an angle B of 40-60° relative to a horizontal plane, and preferably by about 45° angle.
  • the passages in the segmented ring lower pieces 31b are sized to accommodate the largest volumetric flow for a particular pulverizer frame size.
  • the passages in the ring upper pieces 31a are sized to provide the proper air velocity for particulate coal transport based on the actual volumetric flow required for a particular pulverizer installation. As a result, the opening area in the upper pieces 31a are always equivalent to or smaller than the opening area in lower pieces 31b.
  • the total cross-sectional area of the flow passages 33 in the upper pieces 31a should be made 50-100% of the cross-­sectional area of the flow passages in lower pieces 31b.
  • portions of the upper pieces 31a may overlap portions of the flow passageways in the lower pieces 31b, as is shown by Fig.4.
  • a pulverizer for coal having a configuration generally as shown in Fig. 1 was constructed having a segmented air port configuration.
  • the air port included a segmented inner ring bolted onto the periphery of the grinding table and having a plurality of air passageways which are angled both inwardly and forwardly.
  • the segmented inner ring included upper and lower parts each separately bolted onto a segmented retainer ring which is bolted onto the periphery of the grinding table.
  • the air port also included a segmented outer ring, which had lower parts welded onto the pulverizer housing walls and upper parts bolted onto the lower parts.
  • the air port segments had the following characteristics: Grinding table outer diameter, in.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
EP19900307681 1989-07-20 1990-07-13 Installation de broyage ayant une cuve rotative et des segments de canalisation du flux d'air démontables Expired - Lifetime EP0409498B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US38237489A 1989-07-20 1989-07-20
US382374 1989-07-20

Publications (3)

Publication Number Publication Date
EP0409498A2 true EP0409498A2 (fr) 1991-01-23
EP0409498A3 EP0409498A3 (en) 1991-04-17
EP0409498B1 EP0409498B1 (fr) 1994-05-18

Family

ID=23508682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900307681 Expired - Lifetime EP0409498B1 (fr) 1989-07-20 1990-07-13 Installation de broyage ayant une cuve rotative et des segments de canalisation du flux d'air démontables

Country Status (4)

Country Link
EP (1) EP0409498B1 (fr)
JP (1) JPH0783839B2 (fr)
CA (1) CA1311232C (fr)
ES (1) ES2053114T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0507983A1 (fr) * 1991-04-09 1992-10-14 March-Southwestern Corporation Pulvérisateur pourvu d'un anneau d'étranglement rotatif
DE4340195A1 (de) * 1992-11-25 1994-06-09 Babcock & Wilcox Co Geschweißtes rotierendes Ringkanalsegment für Kohlenstaubmühlen mit austauschbaren Leitschaufeln und einstellbarer Kanalöffnungsfläche
EP0804964A3 (fr) * 1995-09-06 1997-12-10 Joe H. Bunton Pulvérisateur avec classificateur à haute performance
US7926755B2 (en) * 2008-11-17 2011-04-19 Ihi Corporation Biomass mill
CN118988460A (zh) * 2024-09-06 2024-11-22 郑州市东易炉料有限公司 一种耐火材料生产用原料研磨设备

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5030430B2 (ja) * 2006-02-07 2012-09-19 三菱重工業株式会社 竪型ローラミル
JP4814127B2 (ja) * 2007-03-13 2011-11-16 象印ベビー株式会社 歩行補助器
GB2458354B (en) * 2008-03-20 2010-03-24 Paul Andrew Comer Pulveriser mill with port ring

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264041A (en) * 1979-09-28 1981-04-28 The Babcock & Wilcox Co. Low pressure drop pulverizer throat
US4523721A (en) * 1982-12-08 1985-06-18 Combustion Engineering, Inc. Bowl mill with primary classifier assembly
US4687145A (en) * 1985-12-12 1987-08-18 The Babcock & Wilcox Company Roll-and-race pulverizer with rotating throat
JPS62160148A (ja) * 1986-01-06 1987-07-16 株式会社神戸製鋼所 ロ−ラミルのノズル構造
JPS62266147A (ja) * 1986-05-13 1987-11-18 株式会社神戸製鋼所 ロ−ラミルのノズル装置
US4752037A (en) * 1987-04-01 1988-06-21 Combustion Engineering, Inc. Vane wheel assembly for rb mills
DE3822290A1 (de) * 1988-07-01 1990-01-04 Babcock Werke Ag Walzenschuesselmuehle

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0507983A1 (fr) * 1991-04-09 1992-10-14 March-Southwestern Corporation Pulvérisateur pourvu d'un anneau d'étranglement rotatif
DE4340195A1 (de) * 1992-11-25 1994-06-09 Babcock & Wilcox Co Geschweißtes rotierendes Ringkanalsegment für Kohlenstaubmühlen mit austauschbaren Leitschaufeln und einstellbarer Kanalöffnungsfläche
EP0804964A3 (fr) * 1995-09-06 1997-12-10 Joe H. Bunton Pulvérisateur avec classificateur à haute performance
EP0812623A1 (fr) * 1995-09-06 1997-12-17 Joe H. Bunton Pulvérisateur avec classificateur à haute performance
US7926755B2 (en) * 2008-11-17 2011-04-19 Ihi Corporation Biomass mill
CN118988460A (zh) * 2024-09-06 2024-11-22 郑州市东易炉料有限公司 一种耐火材料生产用原料研磨设备
CN118988460B (zh) * 2024-09-06 2025-05-06 广西东易新材料有限责任公司 一种耐火材料生产用原料研磨设备

Also Published As

Publication number Publication date
EP0409498B1 (fr) 1994-05-18
JPH0783839B2 (ja) 1995-09-13
ES2053114T3 (es) 1994-07-16
CA1311232C (fr) 1992-12-08
EP0409498A3 (en) 1991-04-17
JPH0380943A (ja) 1991-04-05

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