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Pulverizers

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001620
EISBN: 978-1-62708-229-7
...Abstract Abstract Two vertical coal-pulverizer shafts at a coal-fired generation station failed after four to five years in service. One shaft was completely broken, and the other was unbroken but cracked at both ends. shaft material was AISI type 4340 Ni-Cr- Mo alloy steel, with a uniform...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001730
EISBN: 978-1-62708-229-7
...Abstract Abstract A shaft can crack twice before it fails. A Detroit electric plant had this experience with one in a coal pulverizer. Because the first crack rewelded partially (by friction) in service, the pulverizer remained serviceable until the second crack developed. Coal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0047813
EISBN: 978-1-62708-229-7
...Abstract Abstract After being in service for ten years the ball-and-race coal pulverizer was investigated after noises were noted in it. Its lower grinding ring was attached to the 6150 normalized steel outer main shaft while the upper grinding ring was suspended by springs from a spider...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001300
EISBN: 978-1-62708-215-0
...Abstract Abstract A bull gear from a coal pulverizer at a utility failed by rolling-contact fatigue as the result of continual overloading of the gear and a nonuniform, case-hardened surface of the gear teeth. The gear consisted of an AISI 4140 Cr-Mo steel gear ring that was shrunk fit...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001700
EISBN: 978-1-62708-229-7
...Abstract Abstract A straight-tube cooler type heat exchanger had been in service for about ten years serving a coal pulverizer in Georgia. Non-potable cooling water from a local lake passed through the inner surfaces of the copper tubing and was cooling the hot oil that surrounded the outer...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003572
EISBN: 978-1-62708-180-1
... a smooth metal. Increase in load and speed results in higher wear of FRP through different mechanisms. High load results in more fiber cracking and pulverization leading to deterioration in load carrying capacity, while high speed accelerates the debonding of fibers/fillers. This results in easy peeling...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001850
EISBN: 978-1-62708-241-9
... out over a localized area. The bulging occurred at 3 O’clock position with a length, width, and height of 300, 150, and 12 mm, respectively. The location of bulging in the blow pipe was adjacent to the injection lance used for injecting pulverized coal into the furnace ( Fig. 1 ). The failure...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0091853
EISBN: 978-1-62708-223-5
... plates in the attrition mill, with quartz attrition leading to failure of the part in the following way. When the quartz particles are pulverized by the rubbing action between the rotating plate and the stationary plate, particles become embedded in the two grinding plates and abrade through...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003565
EISBN: 978-1-62708-180-1
... fracturing on the surface and crushing of debris; stage 2, extrusion of pulverized debris in interstices and compaction of a fine grained film; stage 3, nucleation of cracks along the weak film/substrate interface; and stage 4, lateral propagation of interfacial cracks and delamination of the compacted film...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006793
EISBN: 978-1-62708-295-2
... ring cracks, and delamination layers. The removed material is pulverized and compacted. At acute contact angles, where the largest slip occurs, the wear debris is also sheared, transferred, and redeposited. Delamination is generally the dominant wear process. It causes extensive material removal...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003560
EISBN: 978-1-62708-180-1
... of the wearing surfaces and fractures and pulverizes the abrasive ore particles. Hard minerals, such as quartz, indent and scratch martensitic steels having yield strengths of 2100 MPa (300 ksi) ( Ref 9 ). High-stress abrasion is sometimes referred to as three-body abrasion, although two-body, high-stress...
Book Chapter

Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006790
EISBN: 978-1-62708-295-2
... that occurs in grinding mills takes place over a very small contact region, where the ore particles are caught between the grinding balls or between grinding balls and the mill liner. The high contact pressure produces indentations and scratching of the wearing surfaces and fractures and pulverizes...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003568
EISBN: 978-1-62708-180-1
... M.T. , and Wall D.J. , Erosion in Pulverized Fuel Distribution Systems: Materials Selection and Plant Performance , Proc. Seventh Int. Conf. Erosion by Liquid and Solid Impacts , University of Cambridge , 1987 , p 74–1 to 74-8 27. Wellman R.G. and Allen C...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006795
EISBN: 978-1-62708-295-2
.... , Low M.B.J. , Parry M.T. , and Wall D.J. , Erosion in Pulverized Fuel Distribution Systems: Materials Selection and Plant Performance , Proc. Seventh Int. Conf. Erosion by Liquid and Solid Impacts , University of Cambridge , 1987 , p 74-1 to 74-8 26. Wellman R.G...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006825
EISBN: 978-1-62708-329-4