Evaluation of compression behaviour of bulk rapeseeds in linear pressing

Bc. Rachid Mahroum, BA

Bakalářská práce

Abstract:

This Thesis investigated the compression behaviour of bulk rapeseeds under compression loading by applying the response surface methodology using Box Behnken design (BBD) for three processing factors namely force: 60-100 kN, speed: 5-15 mm min-1 and moisture content: 5-11% (w.b.). The pressing vessel diameter of 60 mm and pressing height of the sample of 60 mm were considered. In total 17 experiments were conducted where oil yield (%), oil expression efficiency (%) and deformation energy (J) were calculated. The values of deformation (mm) were obtained directly from the compression tests. Based on the response surface regression results, the optimum processing conditions for oil yield and oil expression efficiency were observed at a force of 100 kN, speed of 5 mm min-1 and moisture content of 5% w.b. For energy, the optimum factors were found at forces of 90 and 96 kN, speeds of 5 and 6.5 mm min-1 and moisture content of 5% (w.b.). However, based on the compression test results, the optimum factors were achieved at force 80 kN, speed of 5 mm min-1 and moisture content of 5% (w.b.). Regression models were described for the responses: oil yield, oil expression efficiency and energy respectively. The coefficients of the regression models were statistically significant (P < 0.05). The effects of processing factors on oil yield and energy requirement of bulk rapeseeds in non-linear pressing involving mechanical screw presses were discussed. Validation of the predicted responses based on the optimized processing factors should be considered in future research.

Keywords

Rape oil-bearing crop, response surface methodology, Box Behnken design, mechanical properties, deformation curve patterns, uniaxial compression

Jazyk práce: angličtina

Datum vytvoření / odevzdání či podání práce: 27. 5. 2020

Obhajoba závěrečné práce

• Vedoucí: Ing. Abraham Kabutey, Ph.D.

Česká zemědělská univerzita v Praze

Technická fakulta

Bakalářský studijní program / obor:
Zemědělské inženýrství / Agricultural Engineering