INTRODUCTION
Straw pellet mill is mainly used to process the crop straws into biomass pellets, which can be used as fuel for heating and cooking at home. Nowadays, the market of straw pellet mill is expanding greatly. Many factors contribute to the popularity of straw pellet mill, including abundant raw material, strong support of government and mature development techniques.
1. Abundant Raw Materials
China is a large agricultural country. The crops are extremely rich in species and large in quantity. Therefore, straws, the main by-products of crops, are the major biomass resources. The annual output of crop straws reach up to 700 million, half of them are utilized, including returning to the field directly, burning as fuel, feeding the animals, being industrial raw materials, etc. There are still half of them are abandoned. Besides, the amount of forestry and wood industry wastes, wood residues in paper industry and bagasse reaches up to ten millions of tons annually. Most of the residues are abandoned and can be a burden to the environment. Therefore, we should make full of the cheap and abundant raw materials, which can not only save the resource, but protect the environment.
2. Strong Support of Government
Energy issue is the determining factor for the development of social economy. The tension supply of traditional fuels has affected the rapid development of social economy seriously, besides, the fossil fuels release large amounts of carbon dioxide, sulfur dioxide and nitric oxide, which pollute the environment seriously. Therefore, the government pay high attention to the utlization and development of the renewable energy.
3.Mature Development Techniques
Compared with other biomass energy, biomass pellet fuel can be produced in large scale easily. After pelletizing, the density of pellets has been increased largely, which is convenient to transport and store, meanwhile, the fuel performance is improved greatly. The straw pellets can be burned sufficiently, and the ash can be used as potash fertilizer. What is more, the big flame, long burning time, low cost and high caloric value make straw pellet be the optimum choice.