Determining the effect of pressing pressure and pressing die temperature on the compressive strength of fuel briquettes made from oak wood waste
DOI:
https://doi.org/10.36930/42265213Keywords:
fuel briquettes; oak wood; Quercus robur L.; residual wood; hot pressing; pressing pressure; pressing die tempera-ture; compressive strength; mathematical modelling; design of experimentsAbstract
The paper investigates the influence of hot pressing parameters on the mechanical strength of fuel briquettes manufactured from residual oak wood (Quercus robur L.) generated by woodworking production. The objective of the study was to determine the quantitative effect of pressing pressure and pressing die temperature on the compressive strength of fuel briquettes and to develop a mathematical model for predicting the investigated response. The experimental study was carried out using a second-order response surface experimental design (Box design). The investigated factors were pressing pressure ranging from 85 to 135 MPa and pressing die temperature ranging from 90 to 150°C. Experimental results were statistically processed using Cochran`s, Student`s, and Fisher`s criteria. A second-order regression model was developed in both coded and natural variables. The results showed that increasing pressing pressure and die temperature increased the compressive strength of fuel briquettes from 12.44 MPa to 30.64 MPa. Pressing pressure was identified as the most influential factor, whereas higher die temperatures enhanced the natural bonding of wood particles due to the thermoplastic behavior of lignin. The optimal technological region was determined at 130–135 MPa and 145–150°C, where the predicted compressive strength exceeded 30 MPa. The scientific novelty of the research consists in establishing the quantitative relationships between pressing pressure, die temperature and compressive strength of fuel briquettes produced from residual oak wood, as well as developing an adequate quadratic mathematical model of the process. The practical significance of the obtained results lies in the possibility of predicting the mechanical properties of briquettes and optimizing industrial pressing regimes to improve the efficient utilization of woodworking residues
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