A Method of Adding Binder by High-Pressure Spraying to Improve the Biomass Densification

Abstract

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.

Co-densification of rice straw and cow dung in different food-to-microorganism ratios for biogas production

“…To enhance the binding between inter-particles and reduce the additional energy requirement, co-densification has been developed, in which different materials are utilized as binders, resulting in improved performance 10 . Different materials, such as molasses combined with crude glycerol 11 , soaked brown sugar water 12 , plastic garbage 13 , and pyrolysis bio-oil 14 , have demonstrated the potential to enhance strength and densification efficiency. These materials may not be the most convenient binders in rural areas due to its inherent viscous nature and/or limited availability at the household level.…”