Effect of hammer shape and impact area on hammer mill performance under different feed rates

Abstract EN

The research aims to compare the performance (PC) and specific energyconsumption (Spc.

) of the hammer mill when using the T-hammer against the(traditional) rectangular hammer.

A homemade mill with four hammers was used inexperiment.

36 treatments: 2 hammer shape x 3 impact area (840, 720 and 960 mm2)x 2 feeding rates (1500 and 3000 g min-1) x 3 replicates, with completely randomdesign.

The results showed that there was no significant effect of hammer shape onPC at the feed rate of 3000 g min-1, while there was an effect at the rate of 1500 gmin-1.

An effect was also found for the impact area on the PC at both feeding ratesand on Spc.

, as an inverse relationship appeared between the impact area and millproductivity at the feed rate 1500 g min-1.

The area of 720 mm2 surpassed the area480 and 960 mm2 at the rate of feeding 3000 g min-1, as it recorded 1215.65 g min-1compared to 950.65 and 882.65 g min-1, respectively.

There is effect of feeding rateon PC and Spc.

The traditional hammer is recommended for simplicity of design, manufacture and performance at high feed rates compared to the T-shaped hammer.