Straw Slow Pyrolysis Liquid Products And Fractionation Properties Of Study

China is a large agricultural country, rich in crop straw yield, the effective use of crop stalks and other biomass energy, related to the settlement of rural life, the important issue of energy use. Speed up the industrialization of straw decomposition, and to develop ecological agriculture use, is the subject of the Agricultural Development is also building a well in the rural areas an effective way. Straw pyrolysis products are characterized by solid, liquid, gaseous products are, and can use. Relative to the solid carbon and the use of pyrolysis gas convenience, the use of liquid products is relatively complicated. Straw produced by pyrolysis bio-oil contains some of the undesirable characteristics to the bio-oil directly as a high-grade energy resources brought some unavoidable problems, such as poor thermal stability, low heat value, low-volatile and corrosive, must be applied for further modification. For the direct application of bio-oil and further modification, physical and chemical properties of the liquid products to test for fractional analysis and tests of its very necessary.In this paper, a common corn stalk, corn cob, wheat straw as the research object, through rigorous scientific testing and careful, accurate processing of straw slow pyrolysis liquid products and fractionation properties of the experimental study, obtained the following main elements and Research Conclusion:(1) Straw slow pyrolysis properties of liquid products. The experimental measurements, the higher the moisture content of liquid products, nearly 25% in the subsequent development should pay attention to water separation. Strong acid liquid products, pH, around 2.6, in the storage, transportation should pay attention to the choice of equipment. Density of liquid products in between 1100 Kg/m3~1200Kg/m3, dry basis calorific value of approximately 20 MJ/Kg, to reflect the amount of biomass pyrolysis process on the increase in density.(2) Slow pyrolysis liquid products of straw fractions of molecular distillation. By analyzing the physical properties of the various fractions, and fractionation of liquid products with and without compare, was found in all light conditions showed a higher fraction of acidic, liquid products through the molecular distillation of the water and almost all of distillate are light fraction, its water content to 50 ~ 70wt%, non-combustible. Calorific value is the heavy fraction of the maximum, one of the calorific value to 25.4MJ/Kg, than the original liquid products increased by 60% or more. (3)By comparing three different lateral conditions hereinafter kind of distillation temperature fractions, the contents of all classes, and the comparison between the condition of three fractions with the same percentages of ethnic categories, analysis of various fractions after fractionation component distribution and the distillation temperature on the fraction composition distribution. Fraction A, the largest proportion ketones, most of the liquid products of the light components which are; fraction B, only ketones and phenols were higher, accounting for all other ethnic categories less; fraction C does not contain acids and U-alcohols, the phenols, only catechols account for a large proportion of the absolute, the other uniformly distributed in about 5%. Distillation temperature change shows that ketones, catechol, phenol of the most significant.