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Keywords = vertical ball-race mill

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17 pages, 11441 KiB  
Article
Comparison of Wear Resistance of Overlay Welded Layers and Thermal Sprayed Coatings in Real Conditions
by Michał Szymura, Grzegorz Gąsiorek, Artur Czupryński, Waldemar Kwaśny and Viktor Kvasnytskyi
Materials 2023, 16(22), 7215; https://doi.org/10.3390/ma16227215 - 17 Nov 2023
Cited by 1 | Viewed by 1732
Abstract
Tribological tests in real conditions enable obtaining full data on the life of interacting machine parts. This article presents the results of operational tests on the elements of the support ring guidance system in a vertical ball-race mill. The guide and active armour [...] Read more.
Tribological tests in real conditions enable obtaining full data on the life of interacting machine parts. This article presents the results of operational tests on the elements of the support ring guidance system in a vertical ball-race mill. The guide and active armour operate under abrasive wear conditions with moderate-impact loads. The wear resistance of elements with overlay welding layers deposited with flux cored wire with a structure of high-alloy chrome cast iron and with a coating flame-sprayed with nickel-based powder was compared. The wear intensity of the overlay weld deposits was much lower than that of the sprayed coatings. The scope of this study also included the analysis of the chemical and phase composition, macro- and microscopic metallographic examinations, and the measurement of the hardness of the deposited layers and coatings. Full article
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15 pages, 4346 KiB  
Article
Technique to Investigate Pulverizing and Abrasive Performance of Coals in Mineral Processing Systems
by Wojciech Grzegorzek, Daniel Adamecki, Grzegorz Głuszek, Aleksander Lutyński and Daniel Kowol
Energies 2021, 14(21), 7300; https://doi.org/10.3390/en14217300 - 4 Nov 2021
Cited by 2 | Viewed by 2812
Abstract
The operating costs of breaking coal particles into fine powder, to achieve optimum combustion for the boilers in a power plant, are made up of power input to carry on an energy intensive comminution mechanism and to overcome friction losses within pulverising machines. [...] Read more.
The operating costs of breaking coal particles into fine powder, to achieve optimum combustion for the boilers in a power plant, are made up of power input to carry on an energy intensive comminution mechanism and to overcome friction losses within pulverising machines. The operating costs also include the cost of the replacement of the processing system’s components due to wear. This study presents the development and application of an attrition test machine that enables an investigation of the factors that influence pulverizing efficiency. The attrition tester simulates grinding conditions in real vertical spindle mills. In this kind of mill, as with the tester, the size reduction process results from a shearing action during the redistribution of the coal particles. The redistribution and attrition within the coal bed are forced by movement of the rollers (or by a disc rotation, in the case of the tester). The testing method was oriented toward mechanical properties, i.e., internal friction shear strength, abrasiveness and grindability. This method enables facilitated testing procedures and a more exact simulation of grinding in vertical spindle coal mills. Ball-race mills and Loesche roller mills were used. Full article
(This article belongs to the Special Issue The IMTech 2021 Innovative Mining Technologies)
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