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Analysis of energy consumption of crushing processes – comparison of one-stage and two-stage processes

Ciężkowski P., Maciejewski J., Bąk S.

Studia Geotechnica et Mechanica

2017

Vol. 39, nr 2

17--24

This paper presents experimental comparison of two machine crushing technologies: one-stage and two-stage. The study was carried on a model double-toggle jaw crusher which allows crushing forces, energy and toggle displacement to be measured. The main aim of the work was to determine the energy consumption of crushing process assuming a given level of fragmentation. Studies were performed on three rocks: granite “Strzegom”, limestone “Morawica” and sandstone “Mucharz”. The material tested had a cubic shape and average dimension of 90 mm. One-stage crushing was carried out for outlet slot er = 11 mm, and two-stage crushing for er = 24 mm and 11 mm. In the tests special design of variable profile moving jaw was used and fixed jaw was flat. The analysis of the results shows that taking into account energy consumption, it is better to use two-stage crushing process. For given materials energy consumption in the two-stage crushing process was reduced by 30%.

Energochłonność jedno i dwuetapowego rozdrabniania ziarna w gniotowniku

Niemiec A., Romański L., Stopa R.

Inżynieria Rolnicza

2005

R. 9, nr 11

333--340

W pracy zaprezentowano wyniki badań porównawczych jedno i dwuetapowego zgniatania ziarna w gniotowniku. Wielkościami porównywanymi była jednostkowa energia zgniatania. Przeprowadzone testy wykazały, że bardziej korzystne jest zgniatanie ziarna w procesie dwuetapowym. W stosunku do rozdrabniania jednoetapowego zużycie energii jednostkowej było o 20% mniejsze. Określono również wpływ szczeliny roboczej gniotownika oraz prędkości obwodowej walców na zużycie energii jednostkowej charakteryzującej proces.

Paper presents the results of comparative studies of one- and two-stage crushing of grain i a crushing mill. Specific energy consumption at crushing was a value to be compared. The study showed much more efficient crushing of gain two-stage process. In comparison to single-stage crushing the energy consumption per unit was by 20% lower. The effects of working gap clearance in crushing mill as well as the rollers’ tangential velocity on specific energy consumption at crushing were also determined.