Sawdust pellet machine is to all kinds of biomass resources including sawdust, straw, rice husk and forestry waste by pressure and heat from loose material compressed into certain shape and density of the molding fuel technology. Biomass compression molding technology application and development, because the average crop straw is loose, small density, low calorific value per unit volume is shortcomings, used as a fuel. This is caused by people don't want to use one of the leading causes of straw as a fuel. Straw biomass molding technology can not only effectively solve the problem, and can effectively change the combustion characteristic of the straw. Raw material after extrusion, the density of 0.8 ~ 1.3 t/m3, the energy density intermediate coal and its combustion characteristic, fire durable, black smoke less, furnace temperature is high, and the storage, transportation and easy to use, the clean health, can replace the fossil energy used in production and living fields. Therefore, as an important means and methods of biomass conversion, compression molding technology is more and more get the attention of the people, specializing in the production of biomass pellet fuel molding machinery and equipment, at the same time we have a large number of small crop straw pellet fuel and pure sawdust pellet fuel.
The production and use of biomass fuel particles, is booming in the developed countries and regions, at home also has caused a high degree of attention. Because of renewable biomass, and low sulfur, low nitrogen and low ashes, zero carbon dioxide emissions and other excellent features, the production and use of wood pellet fuel in Europe, North America, Japan and other places has a history of more than 30 years, now in the production and consumption has reached more than 8 million tons, mainly used for civil and industrial boiler fuel, heating, and even generate electricity.
Biomass pellet fuel production technology mainly has two ways, one is a hot compression extrusion molding technology, the other is a high pressure cavity forming technology. Hot compression molding process generally by pretreating - dry - heat extrusion - cooling of several links, including screw extruding technology often USES - die extrusion forming, or roller pressure, ring die extrusion forming, or on the roller ring die extrusion. The process of equipment, the system complex, high energy consumption, fuel production cost is high. Another genre is used for the cavity loaded high pressure, the mould cavity of biomass compression molding technology, general use hydraulic power, moves the pistons, molding pressure, pressing block or fuel rod. The process of pressure up to 1 00 mpa, large energy consumption, mould wear serious, the production efficiency is low, fuel burning rate is lower than pellet fuel. Whatever the process above, are required to enter compression equipment powder raw material moisture content was 10% ~ 20%. Because need to concentrate drying of raw materials, production equipment is fixed, therefore, USES the factory production mode.
In order to overcome the sawdust pellet machine equipment system is complex, the shortcomings of high energy consumption, both at home and abroad in recent years in biomass forming technology for hard exploratory study. Although liaoning energy in China, the northwest nongda Lin Kesuo, henan agricultural university, nanjing, guangzhou Lin Kesuo institutions such as the development of biomass curing fuel has more than 20 years of history, but there is no breakthrough in the international mainstream technology on the box.