期刊
RENEWABLE ENERGY
卷 142, 期 -, 页码 173-183出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2019.04.114
关键词
Moisture content; Thermal treatment; Die height; Pellet density; Pellet strength
资金
- Ministry of Science and Higher Education in Poland
An experiment using spent coffee grounds (SCGs) was performed with moisture (6.2, 22.5, 23.2, and 33.4% w.b.) and die height (42, 52, 62, 72, 82, and 92 mm) as influencing parameters at a stable temperature of 93 degrees C and speed of 100 mm min(-1), and the monitoring curves of pressure-displacements were studied. Both pelletization factors were significant parameters for the maximum pressure and corresponding piston displacements, pellet movement, specific work, pellet density, and breaking strength. An interaction was found between these factors, but the moisture had a greater and nonlinear effect on the agglomeration parameters than the die height, which influenced linearly the change of these parameters. The agglomeration parameters values increased with decreasing moisture and increasing the die height. The results suggest that high-strength fuel pellets (>1.0 MPa) could be produced from SCG at a suitable moisture (<20% w.b.) and die height (60-70 mm). A regressive model linking compressive stress with the fuel pellets' density and the maximum pressure was developed, which revealed that pressure had a greater influence on the pellet's compressive strength than the pellet density did. A novelty of this work was the application of an adjustable orifice length of the die in which the SCGs were compacted. (C) 2019 Elsevier Ltd. All rights reserved.
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