Pulverizer failure cause analysis. Final report

Technical Report · Sat Dec 01 04:00:00 EST 1979

DOI:https://doi.org/10.2172/5750206· OSTI ID:5750206

Maloney, K. L.; Benson, R. C.

Large coal pulverizers have been identified by EEI surveys as one of the main systems responsible for lost steam generation capacity of large coal fired utility boilers. This report contains the results of a 16 month study to examine the problem of pulverizer outages and to identify root cause failure modes for the major mill types currently in service. A data base of 469 pulverizers, the majority larger than 40 tons/hr coal capacity, was compiled by surveying the utilities with coal fired boilers in this country. The analysis of this data base combined with telephone interviews and seven field site visits to utilities identified both design and operational problem areas in all of the mill types studied. Five specific problem areas were established and evaluated in this study: (1) drive components, (2) grinding zone, (3) air system, (4) mill fires and explosions, and (5) boiler problems associated with the pulverizer. The root causes of these problems were identified and documented. Recommendations for solutions to some of the more common problems were given after discussion of the findings with the manufactuers.

• Research Organization: KVB, Inc., Tustin, CA (USA)
• OSTI ID: 5750206
• Report Number(s): EPRI-FP-1226
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
BEARINGS
COAL PREPARATION
COMMINUTION
EXPLOSIONS
FAILURE MODE ANALYSIS
FIRES
FOSSIL-FUEL POWER PLANTS
GRINDING MACHINES
LUBRICATION
MACHINE TOOLS
MECHANICAL PROPERTIES
POWER PLANTS
RELIABILITY
SEALS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
THERMAL POWER PLANTS
WEAR RESISTANCE