A new
two-stage gasification process, decoupling complex biomass
gasification from biomass pyrolysis and char gasification, has been
proposed for the production of clean industrial fuel gas. In this
work, Chinese herb residues will be used as raw material, and the
fundamental studies and demonstration of this process were conducted
on an externally heated laboratory two-stage gasification setup and
an industrial demonstration plant, respectively. The fundamental studies
found that the appropriate operation of the upstream fluidized bed
(FB) pyrolyzer occurred at 700 °C and the suitable conditions
for effective tar removal in the downstream gasifier were as follows:
850 °C, an equivalent ratio of air (ER) at 0.04, and a retention
time of tar-containing fuel gas above 0.9 s. On the basis of these
fundamental data, an autothermal demonstration plant treating 600
kg of herb residue per hour was built and successfully commissioned
for its continuous running to verify the technology feasibility. The
running data showed that the tar content in the gasified gas was as
low as 400 mg/Nm3 at temperatures of 700 °C for the
FB pyrolyzer and 850 °C for the transport fluidized bed gasifier.
The produced fuel gas had a heating value of ∼5.0 MJ/Nm3. All of these displayed well the technical characteristics
and demonstrated the process feasibility for this newly developed
gasification technology.
This review presents the recent advances and the current state-of-the-art of bioactive glass-based composite biomaterials intended for bone regeneration.
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