摘要
综述了烘焙过程的反应机制和烘焙动力学,分析了烘焙温度、停留时间、升温速率、烘焙气氛等因素对生物质理化特性的影响,探讨了烘焙对生物质后续热解、燃烧、气化的影响.烘焙温度是烘焙过程最主要的影响因素,不同烘焙气氛可以改变烘焙产物分布.烘焙气氛除惰性氮气外,其他气氛如O2、CO2、烟气和NH3等也被应用.烘焙动力学研究有利于揭示烘焙生物质的热降解行为.将烘焙与热解、气化、燃烧等工艺相结合可以获得高品质的生物油和富含氢气的合成气,提高生物质能源的利用效率.对木质纤维生物质烘焙预处理技术从烘焙气氛、集成优化和规模化等方面进行了展望.
Abstract
The reaction mechanism and kinetics of the torrefaction process were reviewed,the effects of torrefaction temperature,residence time,heating rate,and torrefaction atmosphere on the physical and chemical properties of products were analyzed,and the effects of torrefaction on the subsequent pyrolysis,combustion,and gasification were discussed.Torrefaction is usually performed under an inert atmosphere,in which the commonly used gas is nitrogen.In addition,other atmospheres such as O2,CO2,flue gas and NH3 have also been applied.Different atmospheres can change the distribution of torrefaction products.The study of torrefaction kinetics is helpful to reveal the thermal degradation behavior of torrefaction bio-mass and to provide reference for the design of torrefaction reactors.Combining torrefaction with pyrolysis,gasification,combustion,and other processes can obtain high-quality bio-oil and hydrogen-rich synthesis gas and improve the utilization efficiency of biomass energy.Finally,the development of lignocellulosic biomass torrefaction pretreatment technology was prospected regarding atmosphere,integrated optimization and mass production.
基金项目
国家林业和草原局林草科技创新人才项目(2019132610)
NETL
NSTL
万方数据