A novel concentrating photothermal reactor with the ultrafast heating rate at around 1800 °C/min was developed to study the effects of CO₂ and H₂O on coal pyrolysis for oxy-fuel combustion. The mass loss rate with the ultrafast heating rate increased by several decuples than that with the slow heating rate. Coal pyrolysis process with the ultrafast heating rate was promoted by CO₂ within 50% concentration but inhibited for a further higher concentration (70%). The addition of H₂O into 30% CO₂ exhibited a continuous positive role in coal pyrolysis with the ultrafast heating rate. Different from the satisfied prediction of chemical reaction models with the slow heating rates, diffusion models were of higher correlation coefficients for the ultrafast-heating pyrolysis process. The correction factors for CO₂ and H₂O were determined accordingly, and the modified three-dimensional diffusion mechanism model based on Jander equation (D3 model) well described the ultrafast-heating coal pyrolysis process.

开发了一种新型浓缩光热反应器，其超快加热速率约为 1800 °C/min，用于研究 CO ₂和 H ₂ O 对氧燃料燃烧煤热解的影响。超快升温的质量损失率比慢速升温的质量损失率增加了几十倍。具有超快加热速率的煤热解过程在 50% 浓度内被 CO ₂促进，但在更高浓度（70%）时被抑制。将 H ₂ O 添加到 30% CO _{2 中}以超快的加热速率在煤热解中表现出持续的积极作用。与低升温速率的化学反应模型的令人满意的预测不同，扩散模型对于超快加热热解过程具有较高的相关系数。相应地确定了CO ₂和H ₂ O的修正系数，基于Jander方程的修正三维扩散机理模型（D3模型）很好地描述了超快热煤热解过程。