Effect Of Hammer Edge Incline And Grinder Velocity On Some Hammer Mill Performance Indicators

Abstract

The study aims to save hammer manufacturing materials and reduce energy consumption without harmfully impacting the performance of the hammer mill. It involves two factors—the slope of the hammer edge and the angular velocity and their effect on  the mill capacity (MC), Modulus of fineness (FM) and specific energy consumption (Spc). A hammer mill was manufactured locally for this purpose, with an electric motor capacity of 1 hp. The hammer edge incline was done by making a deliberate cut in the edge of the hammer in an angle. Therefore, the study was carried out with four levels of incline angles—0⁰, 30⁰ , 45⁰ and 60⁰—with three angular speeds for the mill—1100, 1247 and 1467 r p m. The results showed that there was a significant effect of hammer edge and angular velocity in MC, FM and Spc. The 30⁰ angle caused a decrease in mill capacity and an increase in the mill’s energy consumption more than the rest of the edge angles, as it recorded a mill capacity of 16.96 kg. h -1 vs. 25.12 , 21.2 and 19.46 kg.h-1 for hammer 0⁰ angle , 60⁰ and 45⁰, respectively. The 60⁰ angle showed the lowest FM for grinding. The mill capacity increases and the energy consumption decreases as the angular velocity increases.