How does the pretreatment method of raw materials affect the quality of Biomass burning pellets?
Publish Time: 2024-11-11
As a renewable energy product, the quality of Biomass burning pellets is significantly affected by the pretreatment method of raw materials.
1. The impact of drying treatment on quality
Drying is a key link in pretreatment. If the moisture content of biomass raw materials is too high, it will make the pellets difficult to form during the pelleting process, and they will appear loose and fragile. Moreover, high moisture content will increase the risk of mold and deterioration during subsequent storage. Appropriate drying treatment, such as hot air drying or solar drying, can reduce the moisture content of raw materials to a suitable level, generally controlled at 10% - 15%. This can ensure that the raw materials have good plasticity during pelleting, make the pellets compact and solid, improve the mechanical strength of the pellets, reduce damage during transportation and storage, and also facilitate the stable combustion process, avoiding excessive heat consumption due to water evaporation.
2. The role of pulverization treatment
The degree of pulverization is directly related to the quality of the pellets. The appropriate pulverization particle size can increase the specific surface area of the raw materials, so that the materials can be better squeezed and bonded to each other during the pelleting process. If the crushing particle size is too large, the internal binding force of the pellets will weaken and cracks will easily appear; if the crushing is too fine, it may increase dust, resulting in poor material fluidity, affecting pelletizing efficiency and particle density. For example, crushing forestry waste to a suitable particle size range can make biomass pellets have more sufficient contact with air during combustion, improve combustion efficiency, make combustion more complete, reduce unburned residues, and increase the calorific value of Biomass burning pellets.
3. The importance of impurity removal
Impurities in raw materials will have a negative impact on pellet quality. Impurities such as soil and stones not only cannot generate heat during combustion, but may also affect the normal operation of combustion equipment and even damage the equipment. In pretreatment, these impurities can be removed by screening, wind selection and other impurity removal methods to ensure the purity of Biomass burning pellets. Pellets made of pure raw materials can release heat more stably during combustion, reduce abnormal fluctuations during combustion, and improve combustion quality and equipment life.
4. The impact of mixed treatment
Sometimes different biomass raw materials are mixed for pretreatment. Mixing different types of biomass, such as mixing agricultural straw and forestry residues in a certain proportion, can adjust the performance of Biomass burning pellets. For example, some biomass with high lignin content can increase the strength of the pellets, while some biomass rich in volatiles can improve the initial performance of combustion. Reasonable mixing pretreatment can combine the advantages of various raw materials and optimize the quality of Biomass burning pellets, so that it can achieve better levels in terms of calorific value, combustion stability, mechanical strength, etc.
