绿色矿冶

Sweet sorghum straw is a kind of biofuel.Rotary cylinder solid-state fermentation is often used to produce ethanol, but heat accumulation is easy to occur in the rotary solid-state fermentation process, resulting in low fermentation efficiency.In this paper, the thermal properties of straw were measured experimentally, and the changes of thermal conductivity and specific heat capacity under different bulk density (porosity), temperature and moisture content of straw were analyzed, which provided basic data for the subsequent study of the motion characteristics of rod-shaped particles in rotary cylinder.The results shows that there is a linear relationship between the porosity of straw and the bulk density.With the increase of bulk density, the porosity decreases.The density of water-bearing straw has a linear relationship with water content, and the density increases with the increase of water content.With the increase of temperature, moisture content and density, the thermal conductivity of straw increases, and the order of influence is: temperature ＞ moisture content ＞ density.In this paper, the specific heat capacity of straw particle pile remains almost unchanged with the increase of water content and bulk density.As the temperature increases, the specific heat capacity increases.