Biological materials such as straw in a certain external pressure, because the materialand between the material and the die roll the mutual friction, the material reaches a certain temperature, coupled with the bonding effect on lignin, so plants becomedense and uniform, when the abolition of external pressure, due to the mutual windingfiber molecules, generally can not be recovery of structure and shape of the original,cooling intensity increases, a briquette.

Biomass pellet fuel is usually referred to by solid biomass raw materials are crushedby compressed into biomass solid forming fuel cylindrical forming machine, diameter ≤ 25mm, ratio of length to diameter ≤ 4, common size 6, 8, 10mm. Density fuel formingparticles increased significantly, significantly reduced volume, convenient transportation and storage; at the same time, small volume, large contact area with the air, favorable to the combustion; specifications, is easy to realize automaticconveying and combustion; can be used as industrial boiler, residential heating andhousehold cooking, heating fuel.

Fuel volatile content is higher, then the ignition easier, combustion performance is better, but the biomass volatile content up to 60%~70%, far higher than coal, theignition performance and combustion performance are superior to those of coal; the carbon content is 35%~42%, far below the coal. This makes the calorific value is lower than coal; N content was 0.5%~3%, the content of S is only 0.1%~0.5%t, NOx and SOduring combustion, emissions are far lower than coal, emissions of CO, and strawphotosynthetic uptake of CO, equilibrium is reached, the basic realization of zero emissions; compared with the original state of biomass resources, time of burning fuel particles more durable. Thus, biomass pellet fuel is a kind of "high-quality, clean,efficient" fuel.