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Material Properties Changes Caused by High Temperature Drying-Corn Cobs Case Study
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DOI：10.3390/ma18102302.png)
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Abstract
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Biomass is an energy source with variable physico-chemical properties. Thermal treatments lower moisture and volatile matter contents. They also raise the high heating value (HHV). This is especially desirable for agro-wastes with low-energy potential, like maize cobs. To make pellets from biomass, it is important to keep the lignin intact. It is responsible for particle adhesion. This paper presents a study focused on high-temperature drying of maize cobs. The process temperatures were selected from a range between 60 and 220 degrees C. The upper temperature limit prevents significant lignin breakdown. We also do not exceed the self-ignition temperature of the raw material. The study analyzed changes in basic technical parameters. These include moisture content, ash content, volatile matter, and HHV. We tested the grinding and densification process. We measured the raw material's particle size distribution (PSD), specific density, and the mechanical durability (DU) of the agglomerates. The study showed a positive effect of high-temperature drying on the technical parameters. We found that the drying of corn cobs at a temperature of 180 degrees C gives the best results. Both PSD and DU values indicate that it is possible to create quality compacted biofuels from this material.
Keywords:
biomass drying
grindability
pellets
solid density
mechanical durability
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3.2
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5.7W
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15.1W
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