The overall impact of CO₂ on the coal char combustion is complicated due to the interplay between the CO₂ thermal effect and chemical effect (including the gasification endothermicity, and its direct additional carbon consumption). To assess the impact of these factors on the carbon consumption process, we conduct a quantitative study on the separate physicochemical effects of CO₂ through experimental and kinetic research. Two oxygen concentrations (15% and 21% O₂), representing industrial boiler and air combustion environments, were selected. The experiment research on its thermal effect (evaluated by carbon conversion ratios) is performed at 1773 K in a high-temperature drop tube furnace. The chemical effect of CO₂ is predicted for a 100 μm coal char particle using a self-developed char burning kinetics model. Results indicate that the carbon conversion ratios show a V-type distribution with higher CO₂ concentrations, as a result of its complex physicochemical effects, with minimal carbon conversion points around the CO₂ concentrations of 5–10 vol.%. The thermal effect initially increases with higher CO₂ concentrations from 0 to 10 vol.%, but it declines with a further increase in CO₂ concentrations, while the endothermicity effect of the gasification reaction increases with higher CO₂ concentrations. The relative contribution of the endothermicity effect on the char consumption is 20.4% in the 21%O₂/10CO₂/N₂ environment, lower than the thermal effect (29.9%), but it continuously increases and becomes the most influential inhibitory factor at higher CO₂ concentrations. The strongest suppression effect of CO₂ corresponds to the CO₂ concentrations of 10 vol.%.

由于CO ₂热效应和化学效应（包括气化吸热及其直接额外碳消耗）之间的相互作用，CO ₂对煤焦燃烧的总体影响是复杂的。为了评估这些因素对碳消耗过程的影响，我们通过实验和动力学研究对 CO ₂的单独物理化学效应进行了定量研究。选择了代表工业锅炉和空气燃烧环境的两种氧气浓度（15% 和 21% O ₂）。其热效应（以碳转化率评价）的实验研究是在1773 K的高温降管炉中进行的。CO ₂的化学作用使用自行开发的炭燃烧动力学模型预测 100 μm 煤炭颗粒。结果表明，由于其复杂的物理化学效应，碳转化率显示出具有较高 CO ₂浓度的 V 型分布，在 CO ₂浓度为 5–10 vol.%附近具有最小的碳转化点。热效应最初随着 CO ₂浓度从 0 到 10 vol.% 的增加而增加，但随着 CO ₂浓度的进一步增加而下降，而气化反应的吸热效应随着 CO ₂浓度的增加而增加。吸热效应对炭消耗的相对贡献为 21%O ₂中的 20.4%/10CO ₂ /N ₂环境，低于热效应（29.9%），但在CO ₂浓度较高时持续增加并成为影响最大的抑制因子。CO ₂的最强抑制作用对应于10 vol.%的CO ₂浓度。