Abstract: In order to develop municipal solid waste (MSW)
pyrolysis/gasification and melting technology with low emission and high
efficiency, it was planed that all the main components in MSW and some typical
kinds of MSW were pyrolyzed/gasified to propose an expert system for raw MSW.
In this paper, wood, which was a prevalent component in MSW, was pyrolyzed and
gasified in fluidized-bed reactors at different apparent excess air ratios
(EARs), temperatures and fluidizing velocities. For pyrolysis, with temperature
increasing from 400°C to 700°C, the yield of pyrolysis char decreased
while that of pyrolysis gas increased (in this paper respectively from 28% to
20% and from 10% to 35%), and when temperature was 500°C, the yield of
pyrolysis tar reached the highest, up to 38% in this paper. It was the optimum
for gasification when temperature was 600°C and apparent EAR was
0.4. Under the experimental conditions of this paper, gasification efficiency
achieved 73%, lower heat value (LHV) reached 5800 kJ/(Nm^3)
and yield of syngas was 2.01 Nm^3/kg. Lower fluidizing
velocity was useful to upgrade gasification efficiency and LHV of syngas for
wood gasification. Based on the results, the reactive courses and mechanism
were analyzed respectively for wood pyrolysis and gasification.
Keywords: wood, pyrolysis, gasification, municipal solid waste(MSW)
