玉米芯热解及过程分析

In order to utilize the agricultural waste corncob comprehensively and effectively, the composition of gaseous and liquid products and the kinetics of pyrolytic process have been investigated. The experimental results show that the gases are mainly composed of CO2 and CO at 350 ℃～400 ℃ which account for nearly 95%. When the temperature is further increased, the yields of CO2 and CO are gradually decreased, but the yields of H2, C2H4, CH4, C3H6 and C3H8 are gradually increased. The gases have nearly 50% of CO and H2 at 450 ℃～500 ℃. The composition of liquid produced during pyrolytic process is analyzed by GC-MS and IR, which reveals that the oxygenated organic compounds such as phenol, furanmethanol, etc. are the main components and a lower temperature benefits the formation of phenol and its derivatives. The analysis of kinetics with TGA elucidates that the pyrolytic process includes two steps. For the first step in the temperature range 211 ℃～290 ℃, the pyrolysis reaction is third order, and it is a half order for the second step at 290℃～418℃, which have the activity energy of 121.47kJ·mol－1 and 105.7kJ·mol-1, respectively.