Abstract: The experiments of biomass pyrolysis were carried out in the pipe-type furnace. The effect of pyrolysis temperature on the char yield was investigated. The difference of biomass pyrolysis char yield between agricultural biomass and forest biomass was studied. The SEM analysis of biomass char was done, the characterization of char surface structure in different pyrolysis temperature was studied. The results showed that the yield of char decreased with the increment of temperature. The char yield of cantleye corniculata and rice husk decreased from 28.38% and 45.84% at 300℃ to 7.55% and 15.45% at 600℃. The yield of char from agricultural biomass was higher than forest biomass at the same pyrolysis conditions. The maximum char yield was 30.32% from bran at 400℃. The minimum char yield was 19.23% from pyinkado, SEM analysis indicated that the char was porous structure.

Key words: biomass, pyrolysis, char, SEM