Biomass briquettes are a kind of clean energy product made of agricultural and forestry wastes, such as straw, sawdust and rice husk by biomass briquette machine. The density is one of the important indexes to measure the quality and combustion performance of briquettes. So, what factors determine the density of biomass briquettes? The following three aspects are discussed: raw material characteristics, processing technology and equipment parameters.

1. Characteristics of raw materials

The types and physical and chemical characteristics of biomass raw materials directly affect the density of briquettes. The fiber structure, moisture content and ash content of different raw materials are different. For example, wood materials such as sawdust usually have higher density after briquetting because of their compact fibers and high lignin content; However, straw raw materials have relatively low briquetting density due to loose fibers. In addition, the moisture content of raw materials is also one of the key factors. Appropriate moisture content (generally between 8% and 12%) can improve the forming effect and density of briquettes, while too high or too low moisture content will lead to difficult forming or loose briquettes.

2. Processing technology

Processing technology also has an important influence on the density of biomass briquettes. In the process of briquetting, cellulose and lignin are softened and rearranged under the action of high temperature and high pressure, thus forming a dense structure. If the heating temperature is moderate, lignin can give full play to the role of “binder”, thus improving the density of briquettes; On the other hand, if the temperature is too low or the pressure is insufficient, it will lead to poor molding and decreased density.

3. Equipment parameters

The performance parameters of biomass briquetting machine, such as die aperture, compression ratio and pressure, also directly affect the density of briquettes. When the die aperture is smaller or the compression ratio is larger, the extrusion force of raw materials is stronger, and the density of briquettes will increase accordingly. In addition, the stability and accuracy of biomass briquetting machine are also very important. If the pressure of equipment fluctuates greatly or the operation is unstable, the density of compact will be uneven.

The density of biomass briquettes is the result of many factors, including raw material characteristics, processing technology and equipment parameters. In order to produce high-quality biomass briquettes, it is necessary to comprehensively consider these factors, select suitable raw materials and optimize production technology according to actual needs. Only in this way can the briquette be ensured to have high density and good combustion performance, which can provide reliable guarantee for the utilization of clean energy.

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