The co-combustion characteristics of coal and microalgae with different blending ratios and under different atmospheres are studied by single particle combustion and thermogravimetric analysis methods. The combustion processes of coal, microalgae and their blends in the single particle combustion experiment have two stages, while the combustion process of coal in the thermogravimetric analysis experiment only has one stage. With the increasing blending ratio of microalgae, flames of volatiles and char of fuels become dimmer and smaller, and the average flame temperature decreases from about 1400 °C to about 1200 °C. The ignition delay time decreases from 200 ms to 140 ms, and the experimental ignition delay time of blended fuels is lower than the theoretical ignition delay time, which demonstrates that the synthetic effect between coal and microalgae exists. To analyze the influence of oxy-fuel atmosphere on the combustion characteristics, the air is replaced by the O₂/CO₂ atmosphere. The replacement decreases the luminosity, size and average temperature of flames. The average flame temperature of volatiles decreases from 1449.4 °C to 1151.2 °C, and that of char decreases from 1240.0 °C to 1213.4 °C. The replacement increases the ignition delay time of fuel from 80 ms to 100 ms. Increasing mole fraction of O₂ in O₂/CO₂ atmosphere can offset these influences. With the increasing mole fraction of O₂, flames of volatiles and char of fuels become brighter and larger, the average flame temperature increases from about 1100 °C to about 1300 °C, while the ignition delay time decreases from 100 ms to 77 ms.

通过单颗粒燃烧和热重分析方法研究了不同配比，不同气氛下煤和微藻的共燃特性。单颗粒燃烧实验中煤，微藻类及其混合物的燃烧过程分为两个阶段，而热重分析实验中煤的燃烧过程只有一个阶段。随着微藻的混合比增加，挥发物和燃料的焦炭的火焰变得更暗和更小，并且平均火焰温度从约1400℃降低到约1200℃。点火延迟时间从200毫秒减少到140毫秒，混合燃料的实验点火延迟时间低于理论点火延迟时间，这表明煤与微藻之间存在合成作用。为了分析含氧燃料气氛对燃烧特性的影响，将空气替换为O₂ / CO ₂气氛。替换会降低火焰的发光度，大小和平均温度。挥发物的平均火焰温度从1449.4°C降至1151.2°C，而炭的平均火焰温度从1240.0°C降至1213.4°C。更换后，燃油的点火延迟时间将从80毫秒增加到100毫秒。在O ₂ / CO ₂气氛中增加O _2的摩尔分数可以抵消这些影响。随着O ₂摩尔分数的增加，挥发物的火焰和燃料的焦炭变得更亮，更大，平均火焰温度从约1100°C升高到约1300°C，而点火延迟时间从100 ms降低到77 ms。