Journal
POLYMERS
Volume 12, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/polym12102374
Keywords
biomass; densification; binder; high-pressure spraying method; relaxation density; compressive strength
Categories
Funding
- Fundamental Research Funds for the Central Universities [2015ZCQ-GX-02]
- Fundamental Research Funds of CAF [CAFYBB2017QB008]
- National Natural Science Foundation of China [31500478]
- Basic Research Fund of the Chinese Academy of Forestry [CAFYBB2017QB008]
- National key research and development program of the 13th five-year plan [2017YFD0600801]
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In order to cut down the usage amount of binder, mix it more evenly with the biomass raw materials and improve the quality of pellets in the densification process, this study explored the feasibility of promoting the densification of biomass by using a high-pressure spraying method to add liquid binder. In the study, a high-pressure sprayer was used to spray saturated brown sugar water into sawdust for densification tests. A three-factor orthogonal experiment was designed to analyze the physical characteristics of the pellets under different variables. Through analysis of range and multiple linear regression, the effect curve was drawn to analyze the impact of the high-pressure spraying method on densification. The results showed that under low compaction pressure of 14.9 MPa, the raw materials with adding 6% saturated brown sugar water can be densified into pellets, while the raw materials without binder cannot. Moreover, compared with the method of adding binder by stirring, the high-pressure spraying method obtained the pellets with fewer cracks on the surface and increased the relaxation density of pellets by 8.65%. Under high compaction pressure (75, 100, 124 and 149 MPa), the high-pressure spraying method has a significant effect on increasing the relaxation density, not only on the compressive strength.
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