Wood pellets are a commonly used biomass fuel, and its specifications and standards may vary in different countries and regions. Below we will introduce common wood pellet specifications.
Size
The size of wood pellets is usually between 6mm and 8mm. This is because this size can provide the best combustion effect and reduce the risk of plugging pressure. Different markets and applications may have different size requirements.
Moisture content
The moisture content of wood pellets should usually be controlled between 8% and 10%. If the moisture content is too high, it will affect the calorific value and combustion effect, and even cause mildew and embrittlement. Therefore, it is necessary to pay attention to controlling the moisture content of raw materials during the production process. and processed by drying or the like.
Calorific value
The calorific value of wood pellets is one of the important indicators to measure its quality. Different types of wood pellets have different calorific values, generally above 4,000 kcal/kg. Consumers can choose the wood pellets that suit them by comparing the calorific value of different products.
Ash
The ash content of wood pellets refers to the amount of ash produced after combustion. Generally, the lower the ash content, the better the quality of the pellets. The ash content of high-quality wood pellets is generally between 0.5% and 1%.
Particle size distribution
The particle size distribution of wood pellets refers to the size distribution of the particles. In general, the particle size distribution should be uniform to ensure the stability of the combustion effect. Uneven particle size distribution will lead to problems such as insufficient combustion, clogging and excessive ash.
Density
The density of wood pellets refers to the weight under a certain volume. Different types of wood pellets have different densities, generally between 600kg/m3 and 750kg/m3. Wood pellets with high density can occupy less during transportation and storage. space for easy use and storage.
The specifications and standards of wood pellets have a great impact on the use effect and safety. When purchasing wood pellets, you should understand the product specifications and standards in detail, and choose products that meet your needs. At the same time, it is also necessary to pay attention to selecting products that meet the relevant national and regional standards to ensure the safety and environmental protection of use.
In addition to the above-mentioned common wood pellet specifications, there are some special requirements, such as: dust-free wood pellets, wood pellets without residue, etc. Dust-free wood pellets refer to those that are removed by special treatment or filtration technology during the production process. Wood chips and dust and other impurities, so that the wood pellets produced have better combustion effect and less air pollution. Residue-free wood pellets refer to the wood pellets produced by removing impurities such as bark and branches during the production process. Wood pellets are purer and safer.
| Particle type | Calorific value (kcal/kg) |
|---|---|
| Pine pellets | 4300 |
| Hardwood pellets | 4600 |
| Elm pellets | 4300 |
| Maple pellets | 4600 |
| Birch pellets | 4300 |
| Beech pellets | 4600 |
| Oak pellets | 4600 |
| Camphor wood particles | 4300 |
| corn stover pellets | 3700 |
| Straw pellets | 3200 |
| Rice husk pellets | 3800 |
| Palm Shell Granules | 4000 |
It should be noted that the calorific value may be affected by factors such as the type of raw material and production technology, so there may be some differences in the actual calorific value. When selecting and using wood pellets, other factors need to be considered, such as moisture content, ash content, particle size distribution, etc. , so as to choose the product that meets your needs.