| Biomass pyrolysis technology for the production of bio-fuels and chemicals has an important potential application prospect.The obtained bio-oils contain a variety of high value-added components.They are widely used in chemical,pharmaceutical,pesticide and other fields.Compared with traditional petroleum and diesel oil,bio-oil has the characteristics of high oxygen content,strong acidity and low calorific value.According to the characteristics of high oxygen content in bio-oil,it can be further converted into a variety of high-value-added chemicals through modification,purification and other processes to greatly improve the economic benefits of biomass energy utilization.In horizontal tubular fixed bed biomass pyrolysis device,with zinc oxide(Zn O),magnesium aluminate spinel(MAS)and Zn O-MAS as a catalyst,to carry out the rape straw,corn straw and wood powder catalytic pyrolysis experiment,the different reaction temperature on the compounds such as aldehyde ketones distribution and content in bio-oil,especially the high value chemicals,such as furfural(FF),methyl ketone of cyclopentene and pyridine.The main test results are as follows:1.In the absence of catalyst,with the increase of pyrolysis temperature,the bio-oil production rate obtained from the three test materials showed a trend of increasing first and then decreasing.The production of biomass oil by the pyrolysis of camphor wood powder first increased rapidly,reaching a maximum value of 51.76% at 500?.Among the three test materials,the relative content of aldehydes in the bio-oil obtained from corn straw at 450? was the highest,which was 11.46 wt%.At 550?,the relative content of ketones in the bio-oil obtained from rape straw was the highest(27.94 wt%).2.After the addition of Zn O catalyst,the bio-oil production rate of the three materials decreased to different degrees,with a significant decrease in the range of 400-500?.When the pyrolysis temperature increased,the bio-oil production rate of the three materials decreased to a certain extent.During the catalytic pyrolysis of camphor wood powder by Zn O,the bio-oil yield reached the maximum value at 550?,which was 48.69 wt%.The relative content of aldehydes in the bio-oil obtained from the pyrolysis of camphor wood powder increased significantly between 450? and 550?,and the highest relative content of aldehydes was obtained at 450?,which was 58.83%.Among the three feedstocks catalyzed by Zn O,the relative content of furfural in camphor wood powder pyrolysis bio-oil increased to 57.48% at 450 ?,13 times higher than that without catalysis.The relative content of methyl cyclopentenone was the largest among the three materials at 550?,3.59%,which was 9.5 times higher than that without catalysis.The relative content of pyridone was the highest among the three materials at 550?,which was 4.08%.Under the catalysis of MAS,the bio-oil yield of camphor wood powder at 500? was the highest,52.86%.MAS made the maximum relative content of ketones migrate to the direction of low temperature.3.Under the catalytic action of zno-mas,the relative content of aldehydes in the three materials increased significantly,and the relative content of aldehydes in the biological oil of camphor wood powder reached a maximum value of 64.31% at 400?.The relative content of ketones in corn straw and rape straw had little effect on the temperature change.At 550?,the relative content of ketones in the bio-oil obtained from corn stover was the highest(16.16%).The relative content of furfural in the three biomass pyrolysis oils was more than 45%,and the highest relative content of furfural moved to low temperature.The relative content of furfural in the biomass oil obtained from camphorwood powder was the highest,64.31% at 400?.The relative content of methyl cyclopentenone in the bio-oil reached the maximum value at 600?,which was 7.44%,4.51% and 5.29% respectively.The catalytic preparation of pyridone from corn straw was the best.At 400?,the relative content of pyridone from corn straw was the highest,which was 12.38%. |
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