Wood pellet fuel needs to be stored in a dry and ventilated place, protected against moisture. Wood particles are easily moldy when stored in a humid environment. Moreover, once the wood pellet fuel is damp, it is difficult to ensure the combustion effect when used, and black smoke may appear, or even cannot be ignited. The storage of wood pellets should pay attention to fire prevention. The essence of wood particles is the same as firewood, which is flammable, and it is easy to fire in the dry season.

It mainly includes waste in agricultural production and processing and all kinds of energy plants. In the process of agricultural production, after harvesting wheat, corn, rice and other crops, the number of inedible residues is very large. China is a big agricultural country, with diverse and complex ecological areas for crop cultivation. In the process of agricultural products to produce waste, such as rice husk, corn cob, peanut shell, bagasse and cottonseed shell, etc., these wastes are relatively concentrated, easy to collect and treat, can be used as biomass fuel, but also as agricultural traditional living energy.

The granulation methods adopted in China are all traditional production methods. The granulation principle of wood particles is shown in Figure 1, which is the same as the existing feed granulation method, that is, raw materials are added from the inside of the ring mold, and the ring mold is rolled and extrusioned by a roller to form pellets. The process flow is shown in Figure 2, including raw material drying, pressing, cooling, packaging, etc. The process needs to consume a lot of energy, first in the process of particle pressing molding, the pressure reaches 50 ~ 100MPa, the raw material deformation under high pressure, temperature can reach 100℃ ~ 120℃, the motor drive needs to consume a lot of electric energy.

Biomass pellet fuel has a large calorific value, and the calorific value is about 3900~4800 kcal /kg, and the calorific value after carbonization is as high as 7000-8000 kcal /kg. Biomass pellet fuel is high in purity, does not contain other sundries that do not produce heat, its carbon content 75-85%, ash 3-6%, water content 1-3%, does not contain coal gangue, stone and other impurities that do not heat but consume heat, will directly reduce costs for enterprises. Biomass pellet fuel does not contain sulfur and phosphorus, does not corrode the boiler, and can extend the service life of the boiler.