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.
Highlights
Biomass, as a clean and renewable energy source, can significantly reduce net carbon emissions compared to fossil fuels and has a very broad development prospect [1]
This experiment used the method of spraying binder with a high-pressure to improve the quality of biomass pellets using poplar sawdust as a raw material and saturated brown sugar water as a binder
An orthogonal experiment was designed to test two physical properties of biomass pellets—which are compressive strength and relaxation density under different compaction pressure—different binder addition ratio and different binder addition methods, and the range and multiple linear regression according to index data were analyzed
Summary
As a clean and renewable energy source, can significantly reduce net carbon emissions compared to fossil fuels and has a very broad development prospect [1]. Due to great concerns about the inevitable depletion of fossil resources, researchers have recently focused on developing new materials from biorenewable and sustainable sources. Biorenewable materials are widely used as reinforcement in many applications [2]. With the disadvantages of low bulk density and irregular shape and size, the biomass raw materials should be densified into higher density biomass pellets before applications, which helps with storage, handling and transportation [3]. Biomass pellets as an important substitution of fossil fuels [5,6,7], which is widely used in industrial power generation and household cooking, will bring the benefits in environmental-friendly and economic aspects
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