Abstract: The pyrolysis characteristics of hawthorn kernel and its product distribution were studied by thermogravimetry experiment under different heating rate and different pyrolysis temperature with self-made fix bed pyrolysis device. The yields of the three-phase products were analyzed and the results showed that the pyrolysis temperature had little effect on the yield of the tar and had significant effect on the pyrolysis gas and the coke yield. With the increase of the pyrolysis final temperature the coke yield reduced, while pyrolysis gas production increased. Under the same pyrolysis temperature, the yield of tar increased(when the pyrolysis temperature was 600℃, the yield of tar increased about 6 percentage points) and the yields of coke and pyrolysis gas decreased with the increase of the heating rate from 5℃/min to 10℃/min, and the greater the pyrolysis temperature was, the greater the effect of the heating rate on the tar yield was. At the same time, improving pyrolysis temperature and heating rate increased the reaction rate.

Key words: hawthorn kernel, pyrolysis, thermogravimetry, tar