Abstract
Field crop residues are considered to be one of the most critical problems facing the Egyptian farmers. The first step towards solving this problem is to cut, crush and mill these lignocellulosic materials in order to be used as raw materials in several industries. For optimizing the milling parameters, the performance of a local hammer mill machine was experimentally investigated during crushing some different types of farm residues (cotton stalks, maize stalks and rice straw), as a function of change in hammer drum speed, concave hole diameter and the residues moisture content. The machine performance was evaluated in terms of machine productivity, particle size distribution, and energy requirements. The experimental results revealed that the performance of the hammer mill was in the optimum region under the following conditions: Hammer drum speed of 44.2 m/s, concave hole diameter of 2 mm and residues moisture content of maize stalks 4.1% , rice straw 3.4% and cotton stalks 7.4%.
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