Biomass resources have the potential to produce clean-energy. However, their physico-chemical properties are inferior to those of coal, and thus, biomass resources are not regarded as ideal feedstock for industrial application. In the present study, the pyrolysis of corn (maize) straw pellets was performed under different temperatures (400, 450, 500, 550 and 600°C) at a 10°C min?1 heating rate and 30 min residence time, and the characteristics of biochar pellets were carefully investigated, particularly their elemental composition, hydrophobicity and mechanical resistance. Fourier transform infrared, proximate analysis and scanning electron microscopy were performed. Results indicated that the mass and energy yields of the biochar pellets decreased from 35.46 to 28.65% and from 50.17 to 45.52%, respectively, at increased temperature. Meanwhile, the higher heating value of the biochar pellets increased from 15.45 MJ kg?1 in the raw materials to 21.86 and 24.55 MJ kg?1 in the biochar produced at 400 and 600°C, respectively. In addition, biochar pellets showed good hydrophobicity, which benefited their storage and transportation, though mechanical resistance decreased. The pellets had compact structures, regular shapes and weakened or no functional groups in contrast with raw pellets, and these properties played important roles in the improvements.
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机译：生物质资源具有产生清洁能源的潜力。然而，它们的理化性质不如煤，因此，生物质资源不被认为是工业应用的理想原料。在本研究中，玉米（玉米）秸秆颗粒的热解是在不同温度（400、450、500、550和600°C）下以10°C min 1 加热速率进行的，停留时间为30分钟，并仔细研究了生物炭颗粒的特性，特别是其元素组成，疏水性和机械强度。进行了傅立叶变换红外光谱，近距离分析和扫描电子显微镜。结果表明，在升高的温度下，生物炭颗粒的质量和能量产率分别从35.46降低到28.65％，从50.17降低到45.52％。同时，生物炭颗粒的较高的热值从原料中的15.45 MJ kg ？1 升高到400和400时生产的生物炭中的21.86和24.55 MJ kg ？1 。分别为600°C。此外，生物炭颗粒显示出良好的疏水性，尽管机械阻力降低了，但也有利于其储存和运输。与未加工的颗粒相比，该颗粒具有致密的结构，规则的形状和弱的或没有官能团，这些性质在改进中起着重要的作用。
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