生物质颗粒燃料成型的黏弹性本构模型

为研究生物质颗粒成型燃料压缩成型机理,该文用玉米秸秆、花生壳、小麦秸秆、大豆秸秆、棉花秸秆、木屑等6种生物质原料,采用生物质颗粒燃料成型机进行压缩成型,研究生物质颗粒燃料压缩成型过程,采用黏弹性理论,建立生物质颗粒成型燃料的本构模型,从力学角度提出生物质颗粒成型燃料的压缩成型机理,并研究对比不同种类生物质原料压缩的最大应力与能耗.结果表明,6种生物质原料中棉杆和木屑的最大应力较高,其余4种原料略低;木屑的压缩能耗最高,其次为棉秆、花生壳和豆秸,小麦秸秆和玉米秸秆较小.该研究结论为解决生物质颗粒成型燃料成型加工能耗高,关键部件受力磨损导致寿命低等问题提供一定参考.

Viscoelastic constitutive model of biomass pellet

The results from this study indicate that there are 50 kinds of volatile organic compounds (VOC's) with particle size of 15-80 mm during MSW composting, including 5 kinds of sulfur odor compounds, 25 kinds of hydrocarbon compounds, 14 kinds of aromatic compounds and 6 kinds of other odor compounds. The correlation analysis show that the odor concentration is significantly correlated with the emissions of sulfurated hydrogen, dimethyl sulfide, carbon disulfide, methyl disulfide, 1,3-dimethyl and o-xylene (p<0.01). Considering of the detection olfactory threshold of all odor compounds, priority control sequence of the odors were sulfureted hydrogen>dimethyl sulfide>methyl disulfide>carbon disulfide>1,3-dimethyl> o-xylene. With the low olfactory threshold of methanthio, even if the emission concentration was very low, it would produce serious odor pollution. Furthermore, NH3 contribution to odor concentration was relatively small, but its emissions were relatively high. It should also focuse on monitoring and control of the methanthio and NH3 during the particle size of 15-80 mm MSW composting. This study can provide a reference for monitoring of odor substances and making control strategy.