Study on Some Mechanical and Chemical Properties of Agro Residual Briquettes Produced from Date Palm Fronds

摘要

The agricultural crop residuals are considered one of the most important problems, which face the environmental life and farmers in the world. A study was carried out to evaluate the physical characteristics of chopped date palm stalks (fronds and leaflets). These properties are necessary to apply normal design procedures such as pneumatic conveying, fluidization, drying, and combustion. The mechanical treatment by cutting, crushing or chopping and briquetting processes are the primary step and the suitable solution for solving this problem and recycling these residuals to be transformed into useful products. So the aim of the present work to get a high quality for agriculture residues such as date palm stalks (Fronds), date palm leaflets briquettes. The results obtained from measuring the mechanical properties (average shear and compressive strength) for date palm stalks at different moisture content (12.63, 33.21 and 60.54%) was (6.4, 4.7 and 3.21MPa) and (3.8, 3.18 and 2.86MPa) respectively. The modulus of elasticity and toughness were evaluated as a function of moisture content. As the moisture content of the stalk regions increased the modulus of elasticity and toughness decreased indicating a reduction in the brittleness of the stalk regions. Chopped date palm stalks (Palm fronds), date palm leaflets having moisture content (8, 10 and 12%) and (8, 10 and 12.8% w.b.) were dandified into briquettes without binder and with binder (Urea-Formaldehyde) using a screw press machine. Quality properties for briquettes were durability, compression ratio hardness, bulk density, compression ratio, resiliency, water resistance and gases emission. The optimum quality properties found for briquettes at 8% moisture content and without binder. Where the highest compression stress and durability were 8.95, 10.39 MPa and 97.06%, 93.64% for date palm stalks (Palm fronds), date palm leaflets briquettes, respectively. The CO and COsub2/sub emissions for date palm stalks (Fronds), date palm leaflets briquettes were less than these for loose residuals.