Impact of the Drying Temperature and Grinding Technique on Biomass Grindability
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Drying
2.3. Solid Density of Samples
2.4. Grinding—Preliminary Stage
2.5. Grinding—Main Stage
3. Results and Discussion
3.1. Grindability in Aspect of Particle Size Distribution Changes
3.2. Grindability from the Aspect of Bulk Density Changes
3.3. Grindability from the Aspect of Energy Demands
4. Conclusions
- The biomass origin affects the grindability. On the basis of the grindability plot, Miscanthus was the most susceptible to grinding and Fagus was the least. Analyzing the relative changes of Miscanthus φ also showed the highest susceptibility, however, the Pinus biomass was the least vulnerable. In the case of G0.25, the least effort should be made to grind Miscanthus with a knife system and the largest for Fagus with a hammer system (regardless of drying temperature). The exception was Miscanthus dried at 60 °C, which had the highest value of G0.25 of all test variants
- Analyzing the influence of drying temperature, the grindability plot did not indicate any noticeable trends. The relative change of φ, clearly correlated with drying temperature. This effect is different with the material. For Miscanthus and Silphium, the grindability increased with the temperature, in contrast to Pinus. In the case of Fagus, the best grindability was characterized by a temperature of 100 °C. Taking into account G0.25, in each case, we observed a decrease in the input into the process as the drying temperature increased.
- The type of milling system, according to the grindability plot, had little influence on the course of the milling process (slightly better parameters can be obtained with a hammer system). The analysis of the relative values of φ changes also allowed us to state that this system will cause larger changes, and thus the milling process evaluated according to this indicator is better than with the knife system. However, the analysis of the G0.25 clearly shows that the knife system is up to twice as energy efficient.
Author Contributions
Funding
Conflicts of Interest
References
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Sieve Classes (mm) | B1:0.25 | B2:0.5 | B3:1 | B4:1.4 | B5:2 | B6:3.15 | B7:6 | B8:+6 |
---|---|---|---|---|---|---|---|---|
Particle Diameter d (mm) | d ≤ 0.25 | 0.25 < d ≤ 0.5 | 0.5 < d ≤ 1 | 1 < d ≤ 1.4 | 1.4 < d ≤ 2 | 2 < d ≤ 3.15 | 3.15 < d ≤ 6 | d > 6 |
Sieve Classes (mm) | B3:1 | B4:1.4 | B5:2 | d50 (mm) |
---|---|---|---|---|
Share (%) | 43 | 26 | 31 | 1.09 |
Raw Material | Drying Temperature (°C) | ||
---|---|---|---|
60 | 100 | 140 | |
Fagus | 0.63 | 0.65 | 0.69 |
Miscanthus | 0.36 | 0.37 | 0.38 |
Pinus | 0.48 | 0.52 | 0.55 |
Silphium | 0.2 | 0.22 | 0.23 |
Grinding System | Temperature (°C) | Fagus | Miscanthus | Pinus | Silphium |
---|---|---|---|---|---|
hammer | 60 | 26.2 | 35.4 | 13.3 | 25.6 |
100 | 22.8 | 35.5 | 13.3 | 31.6 | |
140 | 25.4 | 43.4 | 10.8 | 31.6 | |
knife | 60 | 23.9 | 31.8 | 9.5 | 21.3 |
100 | 20.4 | 27.9 | 7.5 | 29.7 | |
140 | 20.7 | 37.4 | 4.0 | 29.3 |
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Jewiarz, M.; Wróbel, M.; Mudryk, K.; Szufa, S. Impact of the Drying Temperature and Grinding Technique on Biomass Grindability. Energies 2020, 13, 3392. https://doi.org/10.3390/en13133392
Jewiarz M, Wróbel M, Mudryk K, Szufa S. Impact of the Drying Temperature and Grinding Technique on Biomass Grindability. Energies. 2020; 13(13):3392. https://doi.org/10.3390/en13133392
Chicago/Turabian StyleJewiarz, Marcin, Marek Wróbel, Krzysztof Mudryk, and Szymon Szufa. 2020. "Impact of the Drying Temperature and Grinding Technique on Biomass Grindability" Energies 13, no. 13: 3392. https://doi.org/10.3390/en13133392