农业秸秆燃烧特性及动力学分析

选用华中地区典型的农业秸秆（麦秆、稻秆、棉秆以及林业枝条）为研究对象，在热重／差热综合热分析仪（TG-DTA）上研究它们的燃烧特性，并采用非等温积分法（Coats-Refern）分析秸秆的燃烧动力学特性．研究发现：农业秸秆易着火和燃尽，燃烧过程主要包括挥发分的析出燃烧（200-360℃）和固体焦炭的燃烧（360～500℃）．动力学分析表明：挥发分的析出较容易，所需活化能较小（〈100kJ／mol），而固体焦炭的燃烧较难，活化能达150kJ／mol以上．对于不同的秸秆，麦秆和稻秆较易着火燃烧，而棉秆和枝条相对难以着火燃烧，这与其物质组成与化学结构的不同有关．

Combustion characteristics and kinetic analysis of agricultural straw

Typical agricultural straw(wheat straw,rice straw,cotton stalk,and branches) in Central China was studied by thermogravimetry/differential thermal analysis(TG-DTA) to explore their burning characteristics and combustion mechanism and verify the accessibility of the model through simulation.Results show that the agricultural straw is easier to burn.Combustion process includes release of volatile combustion(200~360 ℃) and solid coke combustion(360~500 ℃).Kinetic analysis show that the release of volatile is easier,and smaller activation energy is required(<100 kJ/mol),while the solid coke combustion is more difficult,the activation energy is up to 150 kJ/mol or more.Samples of different straw,wheat straw,and rice straw are easily to ignite,while cotton stalk and branches are more difficult to burn for the components and chemical structures are different respondently.