The complex energy and heat conversion processes in microwave-assisted biomass pyrol-ysis have important effects on product properties.In this study,the thermal history and product distribution characteristics of microwave-assisted biomass pyrolysis under different operating con-ditions were investigated.To detect the mechanism,a numerical model coupled pyrolysis reaction kinetics and the equations of electromagnetic wave and heat transfer for the microwave-assisted biomass pyrolysis was established.The results indicate that,in comparison to conventional pyrol-ysis,the distinctive thermal profile of microwave-assisted pyrolysis results in a 0.71 to 7.43 times increase in the synthesis gas yield(CO+H2)in the pyrolysis gas,along with a 4.87％to 18.8％rise in the selectivity of aromatic hydrocarbon components in bio-oil.By altering the dielectric properties and addition ratio of the microwave absorber,as well as the microwave power,we achieve a certain degree of directional control over the product composition by regulating the heat history during microwave-assistant pyrolysis of biomass.
关键词
生物质/微波辅助热解/产物特征/数值模拟/热历程
Key words
biomass/microwave-assisted pyrolysis/product characterization/numerical simulation/thermal history
维普
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