Research on characteristics of wood pyrolysis and gasification in fluidized beds

Wood widely existed in municipal solid waste (MSW) was pyrolyzed and gasified in fluidized beds to research its reactive characteristics and mechanism. Products from pyrolysis and gasification was analyzed at different excessive air ratio (0-0.8) or temperature (400∼700°C) in fluidized beds. Optimal tar product from fluidized bed pyrolysis furnace with the yield about 38% of feedstock was obtained as temperature of 500°C. Wood gasification in fluidized beds is most suitable at temperature of 600°C and excess air ratio of 0.4. Under this condition, the efficiency of gasification is about 73%, LHV of syngas is about 5800 kJ/Nm3 and its yield is about 2.01 Nm3/kg. Then mechanisms of pyrolysis and gasification are proposed. It is expected to provide some basic data and reference for MSW/wood gasification.