研究木质纤维素类生物质（能源草）在500、600、700、800 ℃热解温度下三相产物的分布及理化特性。在此基础上,进一步结合数学模型,解析不同热解温度下整个热解过程中的质量流、元素流与能量流。研究结果表明,随着温度的升高,热解炭和热解油产率逐渐降低,热解炭的相对结晶度和石墨化程度增强,热解气产率逐渐升高。热解过程中,C、N元素从原料中流向气体产物的比例也随温度的升高而增加;800 ℃时,流向热解气中的C、N元素最高占比分别达到51.22%和34.05%。相应的热解气能量分布显著增加（由5.94%增至41.69%）。在整个热解范围内,热解能量回收总效率均在70%以上,600~800 ℃时热解气的输出能量完全可满足热解过程中需输入的能量。
Abstract
Firstly, the distribution and physicochemical properties of the three-phase products for lignocellulose biomass （energy grass） at different pyrolysis temperatures （500, 600, 700 and 800 ℃） are studied. Besides, the mathematical models were used to further investigate the mass flow, element flow and energy flow throughout the pyrolysis process at different pyrolysis temperatures. The results revealed that as the temperature increased the yields of biochar and bio-oil decreased, while, the relative crystallinity and degree of graphitization for biochar increase, and the yields of pyrolysis gas increase gradually. The flowing proportion of C and N elements into the gas products increases with the increase of temperature, where the maximum flowing proportion of C and N elements into pyrolysis gas are 51.22% and 34.05% at 800 ℃, respectively. Correspondingly, the energy distribution of pyrolysis gas increased significantly （from 5.94% to 41.69%）. The total energy recovery efficiency is more than 70% for the whole pyrolysis process. The output energy of pyrolysis gas can fully meet the input energy required in the pyrolysis process at the temperature range of 600-800 ℃.
关键词
生物质 /
热解 /
物质流 /
能量流 /
温度场
Key words
biomass /
pyrolysis /
material flow /
energy flow /
temperature field
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基金
国家重点研发计划（2018YFE0111000）; 国家自然科学基金面上项目（52176214）; 广东省自然科学基金面上项目（2019A1515011971）
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