Oxidation Catalytic Experimental Study On Biomass Tar Model Compound

Because of the strategy of sustainable development and the requirements of theenvironment pollution control,biomass energy has attracted more and more attention.This paper make a experimental research on biomass tar produced in the biomassgasification system by oxidation and catalytic cracking on the basis of the fluidizedbed reaction system. In different reaction temperature,fluidization velocity and S/Cmole ratio, paper analysis the influence of three oxygen scavenger Ni/NiO,Ni/NiO-MgO, and NiO/Mn40to the conversion rate of the benzene tar model and thestructure of pyrolysis gas. This column explains the mechanism of cracking biomasstar by oxidation catalysis.Through the exergy analysis of the two reaction of biomasspyrolysis reactor system in Xingtai,prove the effects of reaction temperature to thebiomass pyrolysis and gasification.Through the experimental study and numericalanalysis,the principal conclusions of this analysis are as follows.(1) In this small size fluidized bed reaction system, the optimal experimentalconditions of oxidative catalytic cracking which take benzene as biomass tar model are:the reaction temperature is750℃, the fluidizing velocity is4.0m/s, the molar ratio ofS/C is0.7. The corresponding pyrolysis gas components of three catalysts material aresimilar: H2~22%、CO~18%、CO2~11%、CH4~4%，and small amount of CnHm.(2) At the reaction temperature of750℃, the pyrolysis conversion level ofbiomass tar under the catalysis of three different nickel-based catalysts can reach morethan85%. Further increasing the reaction temperature has no significant effect for thegrowth of conversion rate. In a short reaction time, the catalytic conversion efficiencyof Ni/NiO-MgO is slightly higher than the other two groups.(3) The flow rate of carrier gas N2was taken as the flow rate of the system in thereaction system. When it reaches the minimum fluidization velocity4m/s. Thepyrolysis conversion rate of the biomass tar reaches the maximum. On this basis,increase or decrease the flow velocity will lead to decrease in the conversion rate.(4) The addition of water vapor make the catalytic cracking reaction product hasthe CLR again. It can eliminate a part of carbon and optimize the pyrolysis gasproduction structure.(5) The exergy analysis and calculation about dual reactor system of biomasspyrolysis showed that, the optimal pyrolysis reaction temperature of rotary typepyrolysis furnace is about800℃, and the exergy efficiency is67.28%. Furtherincreasing the reaction temperature has no significant effect for the growth of exergyefficiency.