Through the straw granulator, the accumulated straw can be compressed by a large margin at a very low cost, so that the original loose plant fibers are tightly combined to form a coal like texture. Generally speaking, small granulator only needs a small power to compress the straw by 30 times, which greatly facilitates the transportation and can be used in rural areas The same heating effect can be achieved at a lower cost by making pellet fuel and then transporting it to places where it is needed, such as heating stations, instead of coal. Increasing the calorific value gives this cheap pellet fuel a new use.
This kind of granular fuel has a wide range of raw materials. In addition to crop straw, it can also use sawdust, wood bran and other wastes produced in wood processing to press into particles with a diameter of several millimeters through the granulator, just like the coal particles used in boilers. Such particles can have a very large surface area, and can be fully contacted with the air, fully oxidized, and reach a higher temperature So that it can be fully decomposed without producing harmful substances or dust. In many places, it has been proved that this new type of biomass fuel can be used as the main heating fuel.