Oxy-fuel coal combustion could play a significant role in the foreseeable future for its application in carbon capture and storage (CSS) technologies. Therefore, detailed knowledge about the ongoing chemical kinetics in the combustion process is necessary. Here, we present an explorative approach to study volatile species gas phase kinetics in a novel coal-plate experiment probed with molecular-beam mass spectrometry. This coupling allows for time-resolved quantitative measurements of the gas-phase directly above the surface of solid fuels, which aid gaining more insight into the gas phase chemistry during coal combustion by detailed speciation information. Two coal samples, a rhenish lignite and a coal manufactured from hydrothermal carbonization, were chosen for this investigation due to their similar classification but different molecular structures. For both samples, our measurements show a two-stage devolatilization phase separated by a char-oxidation phase which can be attributed to the interaction of oxygen consumption in the gas phase and on the surface and the release of volatiles from deeper layers of the plate. Furthermore, detailed speciation data of light, oxygenated, and tar species allowed to identify fuel structure-specific decomposition patterns of the two different coal materials, thus providing comprehensive data that can be used for future model validation purposes.

在可预见的将来，氧燃料煤燃烧将在碳捕集与封存（CSS）技术中发挥重要作用。因此，需要有关燃烧过程中正在进行的化学动力学的详细知识。在这里，我们提出了一种探索性方法，用于在用分子束质谱法探测的新型煤板实验中研究挥发性物种的气相动力学。这种耦合允许对固体燃料表面正上方的气相进行时间分辨的定量测量，这有助于通过详细的形态信息对煤炭燃烧过程中的气相化学进行更多了解。两个煤样品，菱锰矿褐煤和水热碳化制得的煤，由于其相似的分类但分子结构不同，因此选择了本研究。对于这两个样品，我们的测量结果均显示出由焦炭氧化相隔开的两级脱挥发分相，这可以归因于气相和表面上的耗氧量之间的相互作用以及从板的较深层释放出挥发物。此外，轻，氧化和焦油物质的详细形态数据可以识别两种不同煤材料的特定于燃料结构的分解模式，从而提供了可用于未来模型验证目的的全面数据。我们的测量结果表明，由焦炭氧化相隔开的两级脱挥发分相可归因于气相和表面上的耗氧量之间的相互作用以及板的较深层释放出的挥发物。此外，轻，氧化和焦油物质的详细形态数据可以识别两种不同煤材料的特定于燃料结构的分解模式，从而提供了可用于未来模型验证目的的全面数据。我们的测量结果表明，由焦炭氧化相隔开的两级脱挥发分相可归因于气相和表面上的耗氧量之间的相互作用以及板的较深层释放出的挥发物。此外，轻，氧化和焦油物质的详细形态数据可以识别两种不同煤材料的特定于燃料结构的分解模式，从而提供了可用于未来模型验证目的的全面数据。