微藻是一种新型的可再生生物质资源,采用快速热解技术,可得到高品质的先进液体燃料和高附加值化学品。该文采用热重-红外联用仪、快速热解-气质联用仪和分布式活化能动力学模型(distribution activation energy model,DAEM)对莱茵衣藻(C...微藻是一种新型的可再生生物质资源,采用快速热解技术,可得到高品质的先进液体燃料和高附加值化学品。该文采用热重-红外联用仪、快速热解-气质联用仪和分布式活化能动力学模型(distribution activation energy model,DAEM)对莱茵衣藻(Chlamydomonas reinhardtii,CDR)、小球藻(Chlorella vulgaris,CRV)和铜绿微囊藻(Microcystis aeruginosa,MCA)的热解行为开展了研究,系统地对比了3种微藻在化学组成、热解失重规律、动力学、热解产物等方面的差异,并对微藻的热解机理进行了探讨。结果表明:1)3种微藻的热解过程可分为3个阶段,分别为干燥段、快速热解段和炭化阶段,其中铜绿微囊藻失重率最大,达到17.34%/min,且随着升温速率的增加,TG/DTG(thermogravimetry/differential thermogravimetry)曲线往高温一侧移动;2)红外光谱分析结果表明微藻热解主要产物为CH4、CO2、含C=O键的脂肪酸、含N-H键和C-N键的酰胺类化合物,其中莱茵衣藻热解产生的CH4质量分数最高,铜绿微囊藻热解产生的含C=O键化合物质量分数最高;3)铜绿微囊藻的活化能数值最高,随着转化率增加,活化能从100增加到680 k J/mol;4)Py-GC/MS分析表明小球藻热解产生的含氧化合物质量分数最高,达到30.89%,铜绿微囊藻热解产生的酚类化合物、芳香族碳氢化合物、胺和酰胺类和其他含氮化合物的质量分数最高,分别达到10.41%,13.46%,13.87%和14.27%。本文可为微藻的能源化利用提供科学和基础数据。展开更多
The effect of nano-ZnO,at concentrations of 2.0,10.0,20.0,and 40.0 g·kg<sup>-1</sup>,on mold resistance and flame retardance of Pinus massoniana was studied.Results showed that both drug loading and m...The effect of nano-ZnO,at concentrations of 2.0,10.0,20.0,and 40.0 g·kg<sup>-1</sup>,on mold resistance and flame retardance of Pinus massoniana was studied.Results showed that both drug loading and mold resistance improved as the concentration of nano-ZnO increased with the time to mold initiation for the treated P.massoniana being 3-4 weeks longer than the untreated.The time to ignition（TTI） of P.massoniana treated by nano-ZnO at 2.0 g·kg<sup>-1</sup> was 7 s later than the untreated sample,and the total smoke release（TSR） with 20.0 g·kg<sup>-1</sup> was lower than the untreated.The treated P.massoniana differed slightly from the untreated in heat release rate（HRR）,total heat release（THR）,mass loss rate （MLR）,and effective heat of combustion（EHC）.展开更多
文摘微藻是一种新型的可再生生物质资源,采用快速热解技术,可得到高品质的先进液体燃料和高附加值化学品。该文采用热重-红外联用仪、快速热解-气质联用仪和分布式活化能动力学模型(distribution activation energy model,DAEM)对莱茵衣藻(Chlamydomonas reinhardtii,CDR)、小球藻(Chlorella vulgaris,CRV)和铜绿微囊藻(Microcystis aeruginosa,MCA)的热解行为开展了研究,系统地对比了3种微藻在化学组成、热解失重规律、动力学、热解产物等方面的差异,并对微藻的热解机理进行了探讨。结果表明:1)3种微藻的热解过程可分为3个阶段,分别为干燥段、快速热解段和炭化阶段,其中铜绿微囊藻失重率最大,达到17.34%/min,且随着升温速率的增加,TG/DTG(thermogravimetry/differential thermogravimetry)曲线往高温一侧移动;2)红外光谱分析结果表明微藻热解主要产物为CH4、CO2、含C=O键的脂肪酸、含N-H键和C-N键的酰胺类化合物,其中莱茵衣藻热解产生的CH4质量分数最高,铜绿微囊藻热解产生的含C=O键化合物质量分数最高;3)铜绿微囊藻的活化能数值最高,随着转化率增加,活化能从100增加到680 k J/mol;4)Py-GC/MS分析表明小球藻热解产生的含氧化合物质量分数最高,达到30.89%,铜绿微囊藻热解产生的酚类化合物、芳香族碳氢化合物、胺和酰胺类和其他含氮化合物的质量分数最高,分别达到10.41%,13.46%,13.87%和14.27%。本文可为微藻的能源化利用提供科学和基础数据。
文摘The effect of nano-ZnO,at concentrations of 2.0,10.0,20.0,and 40.0 g·kg<sup>-1</sup>,on mold resistance and flame retardance of Pinus massoniana was studied.Results showed that both drug loading and mold resistance improved as the concentration of nano-ZnO increased with the time to mold initiation for the treated P.massoniana being 3-4 weeks longer than the untreated.The time to ignition（TTI） of P.massoniana treated by nano-ZnO at 2.0 g·kg<sup>-1</sup> was 7 s later than the untreated sample,and the total smoke release（TSR） with 20.0 g·kg<sup>-1</sup> was lower than the untreated.The treated P.massoniana differed slightly from the untreated in heat release rate（HRR）,total heat release（THR）,mass loss rate （MLR）,and effective heat of combustion（EHC）.
