SPECIFIC ENERGY CONSUMPTION FOR REDUCING THE SIZE OF WHEAT GRAINS USING A HAMMER MILL

Ioan BUDĂCAN, Dumitru POP, Ioan DROCAŞ

Abstract


In order to determine which reduction theoretical model (Rittinger, Bond or Kick) is most suitable, the data obtained by measuring the energy required for grinding was fitted into these three models. Based on the final size of ground particles (which we want to obtain), the moisture of initial particles and hammer configuration, the value of the energy required for grinding can be predicted. For the grinding process a MB 7.5 (7.5 kW) hammer mill with three different sieve dimensions was used. A direct relationship between sieve dimension and specific grinding energy was drawn. After this, the specific grinding energy data was fitted in Rittinger, Bond and Kick models and the results showed that, with a coefficient of determination > 0.94 Rittinger model is the most suitable one.

Key words: Bond, Rittinger, Kick, specific energy, size distribution, grinding process, wheat grains.

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