USRE44772E1 - Coal pulverizer/classifier deflector - Google Patents
Coal pulverizer/classifier deflector Download PDFInfo
- Publication number
- USRE44772E1 USRE44772E1 US13/804,842 US201313804842A USRE44772E US RE44772 E1 USRE44772 E1 US RE44772E1 US 201313804842 A US201313804842 A US 201313804842A US RE44772 E USRE44772 E US RE44772E
- Authority
- US
- United States
- Prior art keywords
- deflector
- vane
- air
- milling
- irregularities
- 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.)
- Expired - Fee Related
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title abstract description 8
- 239000003245 coal Substances 0.000 title abstract description 8
- 239000003570 air Substances 0.000 claims abstract description 23
- 238000010298 pulverizing process Methods 0.000 claims description 21
- 239000002245 particles Substances 0.000 claims description 11
- 239000000789 fasteners Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 3
- 239000000203 mixtures Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 materials Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 280000498560 Global, Inc. companies 0.000 description 1
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- 238000000034 methods Methods 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N molybdenum Chemical compound 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[Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000002093 peripheral Effects 0.000 description 1
- 239000007787 solids Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/001—Air flow directing means positioned on the periphery of the horizontally rotating milling surface
Abstract
Description
This invention relates to pulverizing mills for coal and ore and more particularly to an improved deflector structure for use in an updraft mill.
Pulverizing mills are commonly used to crush ore and coal for various purposes. One such purpose is to crush coal into fine particles for use as fuel to fire a boiler for a generator turbine. One type of pulverizing mill comprises a milling bowl which can be rotated about a vertical axis, a chute for dropping lump coal or ore onto the milling bowl and an annular vane structure attached to the outer periphery of the milling bowl for rotation therewith. Air is forced to flow upwardly through the vane structure toward the top of the pulverizing mill housing where a classifier structure separates the particles according to size and admits the smaller particles to a system of conduits which extend to a combustion chamber.
Mounted on an interior surface of the mill housing immediately around and above the vane structure is a deflector structure having an inwardly angled surface upon which air passing through the vane structure impinges so as to be deflected back toward the vertical center line of the pulverizing mill as it makes its way upwardly toward the classifier structure. The deflector prevents the abrasive particles from wearing on the walls of the mill housing and speeds up the particle separation process. The rotating vane mill is just one of many mill designs. Other designs use stationary, non-rotating milling bowls and/or stationary, non-rotating vanes. The invention described herein can be used with all such mills.
The present invention provides an improved deflector for pulverizing mills of the updraft type, wherein the deflector is characterized by a pattern of impingement surface irregularities, such as geometric protrusions, geometric recesses or a combination thereof, which tend to prevent laminar, straight-line flow of airborne particulates thereover and thus create turbulence in the upward flow of the impinging air coming from and through a vane structure. This improves the functions of particle separation and the return of larger, heavier particles to the pulverizing area.
As hereinafter disclosed with reference to one or more illustrative embodiments, the surface irregularities comprise rows of geometric figures such as rectangles which are arranged in such a fashion as to eliminate any straight channels directly through the pattern, particularly in the direction in the flow direction of the impinging air from the vane structure. The term “pattern”, as used herein, does not necessarily mean a regular or predictable arrangement of the geometric figures but may include random arrangements so long as they meet the requirement for reducing or eliminating the straight through flow paths or passages between figures to a considerable degree.
In one embodiment, the deflector structures are cast as arcuate segments of an overall annulus which is adapted to be mounted in one or more conventional ways to the interior cylindrical surface of the pulverizing mill outboard of and just above a vane structure. In the illustrated embodiment, the vane structure is mounted on the periphery of the milling bowl but, as stated above, this is not a requirement for the invention. The geometric surface irregularities can be cast into the segments. Alternatively, the deflector structures may be constructed using welded base elements onto which the deflector impingement structures with the aforesaid geometric pattern are attached such as by threaded fasteners and/or welding.
As will be apparent to those of ordinary skill in the pulverizing mill technology, the impingement surface structures are preferably made of a highly wear resistant material because the impingement of solid particles thereon tends to wear the surfaces away over time, requiring replacement thereof. The replacement function necessitates downtime of the pulverizing mill and this is to be minimized for economic reasons.
The description herein makes reference to the accompanying drawings wherein like reference numerals refer to like parts throughout the several views and wherein:
Air enters a chamber 24 at the lower end of the pulverizer mill 10 through an inlet 22 and flows upwardly through a proprietary double-course vane structure 32 which is attached to the outer periphery of the milling bowl 14 so as to rotate therewith. The double-course vane structure 32 is a proprietary development of SAS Global, Inc. and is the subject of a pending application for U.S. patent application Ser. No. 12/621,814, filed Nov. 19, 2009. As best shown in
Mounted to the cylindrical interior surface 25 of the lower portion of mill housing 12 is a deflector structure 38 having an impingement surface 39 on which air flowing upwardly through the vane structure 32 impinges so as to be deflected back toward the center of the pulverizing mill 12.
As better shown in
Angled vanes 50 are welded between the races 45, 49 and are oriented at a 45° angle relative to the vertical. Reversely angled plates 52 are welded between the race plates 49, 51 and are oriented at 45° from vertical but in the opposite sense to the vane plates 50. An arcuate seal plate 54 is welded to the outside surface of the outer race 51 to narrow the gap between the outer race plate 51 and the deflector structure 38 so that the majority of the upbound air in the updraft pulverizer mill is forced through the vane structure 32.
As shown in
Referring to
The structures 38, 39, 56 and 88 can be cast from alloy steel, with some chromium and molybdenum content. The bolt-on plates can be made of materials such as tungsten carbide, aluminum oxide and hardened steel.
Claims (16)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/685,175 US8308093B2 (en) | 2010-01-11 | 2010-01-11 | Coal pulverizer/classifier deflector |
US13/804,842 USRE44772E1 (en) | 2010-01-11 | 2013-03-14 | Coal pulverizer/classifier deflector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US13/804,842 USRE44772E1 (en) | 2010-01-11 | 2013-03-14 | Coal pulverizer/classifier deflector |
Related Parent Applications (1)
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US12/685,175 Reissue US8308093B2 (en) | 2010-01-11 | 2010-01-11 | Coal pulverizer/classifier deflector |
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USRE44772E1 true USRE44772E1 (en) | 2014-02-25 |
Family
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US12/685,175 Active 2030-10-03 US8308093B2 (en) | 2010-01-11 | 2010-01-11 | Coal pulverizer/classifier deflector |
US13/804,842 Expired - Fee Related USRE44772E1 (en) | 2010-01-11 | 2013-03-14 | Coal pulverizer/classifier deflector |
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US12/685,175 Active 2030-10-03 US8308093B2 (en) | 2010-01-11 | 2010-01-11 | Coal pulverizer/classifier deflector |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150034746A1 (en) * | 2013-08-01 | 2015-02-05 | Storm Technologies Inc. | System for improving airflow characteristics within a coal pulverizer |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8336796B2 (en) * | 2010-09-10 | 2012-12-25 | Wark Rickey E | Impactor ring for updraft classifiers |
US8820535B2 (en) * | 2012-02-07 | 2014-09-02 | Rickey E. Wark | Classifier with variable entry ports |
CN104056691B (en) * | 2013-03-21 | 2018-01-12 | 川崎重工业株式会社 | Vertical roll grinder |
US9468930B2 (en) * | 2014-03-10 | 2016-10-18 | Techinomics, Inc. | Rotatable throat assembly for coal pulverizer |
JP6629605B2 (en) * | 2016-01-27 | 2020-01-15 | 三菱日立パワーシステムズ株式会社 | Classifier, pulverizer and classifier and pulverized coal-fired boiler |
US10668476B2 (en) | 2016-08-03 | 2020-06-02 | General Electric Technology Gmbh | Enclosures for vertical pulverizer systems |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2566103A (en) * | 1947-11-05 | 1951-08-28 | Weston David | Liners for material crushing and grinding mills |
US4270705A (en) * | 1978-08-11 | 1981-06-02 | Minneapolis Electric Steel Castings Company | Shell liner assembly for ore grinding mills |
US4907751A (en) | 1988-10-03 | 1990-03-13 | Sure Alloy Steel | Rotating throat for coal pulverizer |
US5090631A (en) | 1990-10-15 | 1992-02-25 | Wark Rickey E | Air flow rate control device for pulverizer vane wheel |
US7100853B2 (en) * | 2004-07-27 | 2006-09-05 | Wark Rickey E | Deflector for coal pulverizer/classifier |
US7373778B2 (en) * | 2004-08-26 | 2008-05-20 | General Electric Company | Combustor cooling with angled segmented surfaces |
US20110114769A1 (en) | 2009-11-19 | 2011-05-19 | Wark Rickey E | Double course vane wheel |
-
2010
- 2010-01-11 US US12/685,175 patent/US8308093B2/en active Active
-
2013
- 2013-03-14 US US13/804,842 patent/USRE44772E1/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2566103A (en) * | 1947-11-05 | 1951-08-28 | Weston David | Liners for material crushing and grinding mills |
US4270705A (en) * | 1978-08-11 | 1981-06-02 | Minneapolis Electric Steel Castings Company | Shell liner assembly for ore grinding mills |
US4907751A (en) | 1988-10-03 | 1990-03-13 | Sure Alloy Steel | Rotating throat for coal pulverizer |
US5090631A (en) | 1990-10-15 | 1992-02-25 | Wark Rickey E | Air flow rate control device for pulverizer vane wheel |
US7100853B2 (en) * | 2004-07-27 | 2006-09-05 | Wark Rickey E | Deflector for coal pulverizer/classifier |
US7373778B2 (en) * | 2004-08-26 | 2008-05-20 | General Electric Company | Combustor cooling with angled segmented surfaces |
US20110114769A1 (en) | 2009-11-19 | 2011-05-19 | Wark Rickey E | Double course vane wheel |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150034746A1 (en) * | 2013-08-01 | 2015-02-05 | Storm Technologies Inc. | System for improving airflow characteristics within a coal pulverizer |
US9289772B2 (en) * | 2013-08-01 | 2016-03-22 | Storm Technologies, Inc. | System for improving airflow characteristics within a coal pulverizer |
Also Published As
Publication number | Publication date |
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US20110168819A1 (en) | 2011-07-14 |
US8308093B2 (en) | 2012-11-13 |
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