摘要
以麦秆为研究对象,通过水热炭化实验和建立反应动力学模型(考虑灰分),对麦秆水热固体产物的炭化特性和反应动力学参数进行深入研究。结果表明:在200、220和240℃反应温度下,随着停留时间的延长,生物炭质量得率逐渐减少,至停留时间为720 min时,均接近50%;生物炭H/C和O/C物质的量之比逐渐减小,并越来越接近于泥煤甚至褐煤的H/C和O/C物质的量之比。热重分析表明:生物炭展现出较好的热稳定性。以考虑灰分的半纤维素和纤维素两个平行的一级反应动力学模型描述麦秆的水热降解行为,经计算分析,半纤维素和纤维素水热反应活化能分别为54和136 k J/mol。
The hydrothermal carbonization （HTC）experiments of wheat straw were carried out. The properties of HTC solid products were investigated. The reaction kinetics model （considering the ash）was established to obtain the parameters of the reaction kinetics. The results indicated that at 200, 220 and 240 ℃, mass yield of the solid biochar decreases to the same value of approximately 50% by 720 min HTC treatment with the residence time increasing. H/C and O/C molar ratios decrease with increasing HTC process severity, which gradually approach those of peat. The thermal analysis showed that good thermal stability of biochars is exhibited at higher temperature. Two parallel first order reaction models of hemicellulose and cellulose degradation are used to depict the behavior of the wheat straw HTC. The activation energy of hemicellnlose and cellulose are determined to be 54 and 136 kJ/mol, respectively.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2016年第11期2733-2740,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51206194)
河南省高等学校重点科研项目(16A480009)
河南省科技厅科技攻关项目(162102210252)
郑州市科技攻关计划(153PKJGG130)
关键词
水热处理
炭化
麦秆
动力学
生物炭
hydrothermal treatment
carbonization
wheat-straw
kinetics
biochar
