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- W337624916 abstract "This report deals mainly with abrasive wear in coal pulverizers. Eight coals, including bituminous, subbituminous, and lignite, were analyzed in the laboratory to determine their quartz (SiO/sub 2/) and pyrite (FeS/sub 2/) content. The size distribution of these two minerals was also determined. The wear of Ni-Hard rolls from pulverizers, used to grind the above coals at various utilities, was determined. It was found that wear expressed as mils/1000 ton coal correlated much better with the quartz and pyrite content of the coal than wear expressed as mils/hr. Analysis of the data obtained indicated that the effect of quartz on mill wear is much larger than that of pyrite. Coarser size fractions of both materials also increase wear. Based on the data obtained, an analytical procedure to predict the abrasiveness of coals on their quartz and pyrite content was developed. Laboratory studies were also carried out to compare the wear resistance of various commercially available castings and weld overlays. Little difference was found between two grades of Ni-Hard coatings. The wear resistance of higher chromium weld overlays or cast white irons was found to be about twice as high as that of Ni-Hard castings. This is in good agreement withmore » wear of high chromium weld overlays observed by many utilities. 37 refs., 53 figs., 41 tabs.« less" @default.
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- W337624916 date "1988-08-01" @default.
- W337624916 modified "2023-09-27" @default.
- W337624916 title "Evaluation of coal pulverizer materials: Effect of coal characteristics on wear performance and reliability: Final report" @default.
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