Abstract: The super-high temperature medium with low cost was obtained by the technology of the honeycomb ceramic heat exchanger. The pyrolysis behavior of super-high temperature medium(steam and nitrogen) and their influences on the components of pyrolysis products were investigated in the fixed bed pyrolysis reactor. The research results showed that the technology of super-high temperature steam pyrolysis trends to prepare high value solid carbon materials with low volatile content and large specific surface area by high-temperature steam pyrolysis. The surface area of solid char from willow pyrolysis at 958 K under steam medium is 280 m²/g. The loss of mass ratio under different mediums is about 80% and the yield of solid carbon is 20%-30% using willow and caragana as raw materials. With the increase of pyrolysis medium temperature, the ratio of mass loss is improved and the time of pyrolysis becomes short. At the same of pyrolysis temperature, the rate of mass loss in the steam medium is greater than that in the N₂ medium.

Key words: biomass, high temperature steam, pyrolysis, solid product