The development of wood pellet machine resulted from the United States energy shortage in 1870s, and has developed into a more mature development mode and process level now.
The main raw materials of the wood pellet machine comes from the small tree; no commercial value, out of size, decayed, and waste wood; the number of the diseases and insect pests, and the waste wood of the construction site. It is estimated that the use of wood fuel production in the forest may meet the 10% needs of the U.S.
The combustion efficiency of wood pellet can reach to 83%, which can compensate for the energy consumption in the production process. And it equivalent to 0.7---0.8 standard coal, thermal efficiency is considerable.
Wood pellet fuel is mainly used for heating, heating device can be divided into four types: small, medium, large, large. Small can be used to drive the air conditioning system, and you can find this in the United States, Germany, Russia, Austria and other countries; medium for schools and other general unit; large for the forest products industry enterprise; the super-large for power generation.
In 2006, the United States has 60 wood pellet processing plants, but not for export; in 2008, the green environmental protection bio energy Limited by Share Ltd set up an annual output of 560000 tons of plant in Florida, and began to export to Belgium and Holland. At present, anywhere of the country promotes wood pellet fuel, and the government also gives appropriate subsidies, so it has a rapid development.
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