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Producing durable pellets from barley straw subjected to radio frequency-alkaline and steam explosion pretreatments

International Journal of Agricultural and Biological Engineering 2014年第3期7卷 68-82页

作者： Kingsley L.Iroba Lope G.Tabil Shahab Sokhansanj Venkatesh Meda Department of Chemical and Biological Engineering University of SaskatchewanSaskatoon SK S7N 5A9Canada

Pelletization,a form of densification,increases bulk density and improves the convenience and accessibility of biomass feedstock due to the uniform shape and *** of biomass enhances the breakdown and accessibility of the cross-linking lignin,which acts as a binding *** this study,pelletization of radio frequency-alkaline and steam explosion pretreated barley straw was *** levels of temperature(70oC,80oC,and 90oC),five levels of the mass ratio of biomass to NaOH solution(1:4,1:5,1:6,1:7,and 1:8),one hour equilibration time,biomass screen size of 1.6 mm,1%NaOH concentration,and 20 min residence time in the radio frequency chamber were used for the radio frequency-alkaline *** levels of steam temperature(140oC,160oC,and 180oC),three levels of moisture content of 8%,30%,and 50%(mass fraction of total mass),and 5 min and 10 min exposure to steam were tested for the steam explosion *** effects of both pretreatment methods were evaluated by pelletizing the pretreated and non-pretreated barley straw samples in a single pelleting *** pellet density,tensile strength,durability,dimensional stability,and color of the pellets were *** frequency-alkaline pretreatment with the use of 1%NaOH solution and a ratio of biomass:NaOH solution of 1:8 has significant effect(Ppellets with superior physical *** steam exploded samples pretreated at higher temperatures(180ºC)and retention time of 10 min resulted into pellets with good physical qualities.

关键词： radio frequency steam explosion densification biomass pellets and alkaline pretreatment

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