Ansah Emmanuel, Wang Lijun, Shahbazi Abolghasem
Department of Energy and Environmental Systems, North Carolina Agricultural and Technical State University, 1601 E Market Street, Greensboro, NC 27411, USA.
Department of Natural Resources and Environmental Design, North Carolina Agricultural and Technical State University, 1601 E Market Street, Greensboro, NC 27411, USA; Department of Chemical, Biological and Bioengineering, North Carolina Agricultural and Technical State University, 1601 E Market Street, Greensboro, NC 27411, USA.
Waste Manag. 2016 Oct;56:196-206. doi: 10.1016/j.wasman.2016.06.015. Epub 2016 Jun 17.
The thermogravimetric and calorimetric characteristics during pyrolysis of wood, paper, textile and polyethylene terephthalate (PET) plastic in municipal solid wastes (MSW), and co-pyrolysis of biomass-derived and plastic components with and without torrefaction were investigated. The active pyrolysis of the PET plastic occurred at a much higher temperature range between 360°C and 480°C than 220-380°C for the biomass derived components. The plastic pyrolyzed at a heating rate of 10°C/min had the highest maximum weight loss rate of 18.5wt%/min occurred at 420°C, followed by 10.8wt%/min at 340°C for both paper and textile, and 9.9wt%/min at 360°C for wood. At the end of the active pyrolysis stage, the final mass of paper, wood, textile and PET was 28.77%, 26.78%, 21.62% and 18.31%, respectively. During pyrolysis of individual MSW components at 500°C, the wood required the least amount of heat at 665.2J/g, compared to 2483.2J/g for textile, 2059.4J/g for paper and 2256.1J/g for PET plastic. The PET plastic had much higher activation energy of 181.86kJ/mol, compared to 41.47kJ/mol for wood, 50.01kJ/mol for paper and 36.65kJ/mol for textile during pyrolysis at a heating rate of 10°C/min. H2O and H2 peaks were observed on the MS curves for the pyrolysis of three biomass-derived materials but there was no obvious H2O and H2 peaks on the MS curves of PET plastic. There was a significant interaction between biomass and PET plastic during co-pyrolysis if the biomass fraction was dominant. The amount of heat required for the co-pyrolysis of the biomass and plastic mixture increased with the increase of plastic mass fraction in the mixture. Torrefaction at a proper temperature and time could improve the grindability of PET plastic. The increase of torrefaction temperature and time did not affect the temperature where the maximum pyrolytic rates occurred for both biomass and plastic but decreased the maximum pyrolysis rate of biomass and increased the maximum pyrolysis rate of PET plastic. The amount of heat for the pyrolysis of biomass and PET mixture co-torrefied at 280°C for 30min was 4365J/g at 500°C, compared to 1138J/g for the pyrolysis of raw 50% wood and 50% PET mixture at the same condition.
研究了城市固体废物（MSW）中木材、纸张、纺织品和聚对苯二甲酸乙二酯（PET）塑料热解过程中的热重和量热特性，以及生物质衍生成分与塑料成分在有无烘焙处理下的共热解情况。PET塑料的活性热解发生在360°C至480°C的更高温度范围内，而生物质衍生成分的活性热解温度范围为220 - 380°C。以10°C/分钟的加热速率热解时，PET塑料在420°C时的最大失重率最高，为18.5wt%/分钟，其次是纸张和纺织品在340°C时的10.8wt%/分钟，木材在360°C时的9.9wt%/分钟。在活性热解阶段结束时，纸张、木材、纺织品和PET的最终质量分别为28.77%、26.78%、21.62%和18.31%。在500°C下对城市固体废物各成分进行热解时，木材所需热量最少，为665.2J/g，相比之下，纺织品为2483.2J/g，纸张为2059.4J/g，PET塑料为2256.1J/g。在以10°C/分钟的加热速率热解时，PET塑料的活化能高达181.86kJ/mol，相比之下，木材为41.47kJ/mol，纸张为50.01kJ/mol，纺织品为36.65kJ/mol。在三种生物质衍生材料热解的质谱曲线上观察到了H2O和H2峰，但PET塑料的质谱曲线上没有明显的H2O和H2峰。如果生物质部分占主导，则在共热解过程中生物质与PET塑料之间存在显著相互作用。生物质与塑料混合物共热解所需的热量随着混合物中塑料质量分数的增加而增加。在适当的温度和时间下进行烘焙处理可以提高PET塑料的可磨性。烘焙温度和时间的增加并不影响生物质和塑料最大热解速率出现时的温度，但降低了生物质的最大热解速率，提高了PET塑料的最大热解速率。在500°C下，280°C烘焙30分钟的生物质与PET混合物热解所需热量为4365J/g，而在相同条件下，未处理的50%木材和50%PET混合物热解所需热量为1138J/g。
