氧化性气氛中镁颗粒燃烧特性研究进展

摘要

归纳总结了镁颗粒在空气、O2、CO、CO2和H2O(g)中的燃烧特性.不同燃烧产物对二次反应和燃烧速率有不同的影响.基于对镁颗粒燃烧现象和产物分析,镁颗粒经历了从表面多相反应到气相燃烧的过程,镁颗粒着火阶段表面氧化层是由表面多相氧化反应形成,燃烧阶段中表面氧化层是由气相燃烧产物凝结或烧结、氧化层表面吸附反应和Mg-O溶液的相位分离等形成；根据镁颗粒在不同氧化性气氛中的燃烧特性,介绍、评述了镁颗粒在空气或O2、CO2和H2O(g)中的燃烧模型.镁颗粒在各种氧化性气氛中燃烧研究需要对反应机理深入研究；燃烧模型中需丰富燃烧过程的物理化学信息,如反应的机理、化学动力学特性和表面氧化层对燃烧过程中传热传质的影响等.%Combustion characteristics of Mg particles in air,oxygen,carbon monoxide,carbon dioxide and water vapor were summarized.Different combustion products had different influences on second reaction and burning rate.Based on the analysis both of the combustion phenomenon and products,Mg particle experienced a process from surface heterogeneous oxidation to vapor phase combustion.Oxidation layer was formed by surface heterogeneous oxidation during ignition process and by condensation or sintering of products,oxide surface adsorption reaction or a phase separation of Mg-oxygen solution during combustion process.Based on combustion characteristics in different oxidative gases,mathematical models of a Mg particle combustion in oxygen,carbon dioxide and water vapor were introduced.Studies on Mg particles combustion need to focus on reaction mechanism,and model should reflect more physical and chemical information,such as reaction mechanism,chemical kinetics and effects of oxidation layer on combustion process.