Abstract
The binder can improve the physical characteristics of biomass pellets by forming solid bridges and increasing the adhesion of biomass materials. Taking pine sawdust as raw material and brown sugar water with different concentration as a binder, this study adopted spraying and stirring methods, respectively, and mixed brown sugar water with biomass in diverse proportions. The characteristic of pellets such as durability, relaxation ratio and compressive strength were studied by orthogonal design. Through range analysis, BP (Back Propagation) neural network factor significance analysis and mapping the relationship between physical properties and factors according to the importance of each factor, the effect of densification variables on the physical characteristics of biomass pellets was studied, and the outcome of adding brown sugar water binder to raw material by spraying method in improving the densification quality of biomass was explored. Results showed the brown sugar water binder added to pine sawdust by spraying method could mix the binder and biomass raw material more evenly compared with the stirring method. The relaxation ratio of pellets obtained by spraying method was reduced by 13.47%. The optimal densification conditions of pine sawdust were when the compaction pressure was 100 MPa, the mass ratio of brown sugar to water was 2:1, the proportion of brown sugar water to biomass material was 3%, and the adding method was spraying.
Highlights
With the continuous evolution of industry and the improvement of people’s living standards, energy, as an essential material resource for human survival and social growth, has received more and more attention
Nevena et al studied the effect of the addition of syrup on the quality of wheat straw briquette, and the results showed that the addition of 1.5%~3% syrup can effectively improve the relaxation of wheat straw briquette density and compressive strength, and lower energy consumption
Considering that the moisture Pine content of pinefrom sawdust is affectedprovince by temperature and humidity, sawdust is dried and moisture content of pine sawdust is affected by temperature and humidity, the sawdust is dried adjusted to 12% moisture content and sealed for storage before the experiment
Summary
With the continuous evolution of industry and the improvement of people’s living standards, energy, as an essential material resource for human survival and social growth, has received more and more attention. Fossil energy is still the primary source of energy supply in the world today. The non-renewable nature of fossil energy makes the sustainable development of global economy face the challenge of energy resource shortage. The air pollution, greenhouse gas emission and other ecological and environmental problems caused by fossil energy are becoming more and more severe [1]. In order to improve energy conversion efficiency and reduce pollutant emissions [2], as a kind of green, pollution-free and abundant renewable energy, biomass energy has been paid more and more attention [3].
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