Utilization of biofuel produced from Jatropha oil represents one of the most promising options for the use of conventional fossil fuels. Biofuel via biodiesel, a promising substitute as an alternative fuel has gained significant attention due to the predicted shortness of conventional fuels and environmental concern. Experiments were carried out through two successful agricultural seasons of 2016 and 2017 at Department of Agricultural Engineering, Faculty of Agriculture Zagazig University to constract and evaluate the performance of a screw press machine suitable for Jatropha seeds. The performance of the screw press was estimated under four different machine capacity and four different seed moisture contents. The performance of the screw press was evaluated taking into consideration oil yield, extraction efficiency, specific energy and operational cost. The experimental results represented that the highest value for each of oil yield and extraction efficiency was 43 kg.hr.-1 and 81%, respectively and also the values of specific energy and operational cost were 258 kW.hr.Mg-1 and 1229 LE.Mg-1 , respectively at moisture contents of 12% and machine capacity of 166 kg.hr.-1
The present research was carried out to develop and estimate some operating parameters and affecting the performance of a rice milling machine to improve product quality. The rice milling machine was developed by adding two units: cleaning unit to remove chaff and other foreign materials from rice grains before the milling operation and feed unit to adjust rice feed rate. The performance of the developed milling machine was studied under the following parameters: feed rate, drum speed, and grain moisture content in terms of overall machine efficiency, total grains losses, machine productivity, required power, specific energy and criterion cost. The experimental results reveal that the highest values of machine productivity and overall machine efficiency were 1.
The aim of present work was to carry out theoretical analysis to design to design a combination machine to be suitable for chopping and milling Arundo donax plants and then to use the design considerations afterward to manufacture and evaluate the performance of the combination machine to reach up the optimum operating parameters. The design considerations included estimation of the following parameters: number of knives on the cutter-head, cutter-head speed, feed rolls speed and Arundo donax density in the feeding throat. The design considerations were evaluated taking into consideration the following indicators: theoretical cut length, theoretical capacity and required total power; furthermore determination of cutter-head shaft diameter as well as hammer mill shaft diameter. The design results reveal that the highest values of theoretical cut length and theoretical capacity were (29.14 mm and 756 kg/h) respectively, while the lowest values of chopping and milling units power were (9.54 and 20.17 kW), respectively and the values of cutter-head shaft diameter and hammer mill shaft diameter were (50 and 60 mm), respectively under the following conditions: number of knives on the cutter-head of 2 knife, cutter-head speed of maximum 1400 rpm and Arundo donax density in the feeding throat of 6.18 kg/m 3 with adjusting feed rolls speed of 1.36 m/s.1. INTRODUCTION rundo donax (giant reed, giant cane) is one of the largest grass species. A plant that grows in dense stands, it is found in many subtropical and warm-temperate areas of the world. It is thought to be native to eastern Asia, but the precise extent of its native distribution is unknown. Arundo has been introduced around the world as an ornamental/crop species, for erosion control, and for the production of reeds (musical instruments, construction, paper and pulp). It has become invasive in many places throughout the world, primarily in riparian habitat.
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