Integrated Experimental and Computational Studies Of MILD Oxy-Coal Combustion

1704141 Sutherland, James C. 富氧煤燃烧 (OCC) 是一种可行的技术，可产生适合封存的浓缩二氧化碳 (CO2) 流。然而，当今几乎所有正在运行的燃煤电厂以及大多数计划建设的燃煤电厂都是空气燃烧电厂。中度和强化低氧稀释（MILD）燃烧已被提议作为一种技术来实现更高的燃烧效率、在反应区中产生更高的均匀性、减少污染物的形成并提供更均匀的热通量。该项目旨在将这两种技术结合起来，并研究有关 MILD 富氧煤燃烧 (MILD-OCC) 的基本问题。提高对 MILD-OCC 的理解可以对锅炉进行可行的改造或新设计，这不仅可以提高效率，还可以提供可封存的二氧化碳流。这项研究的动机是假设模拟和实验在多尺度范围的条件下一起分析，可以为 MILD-OCC 系统提供有价值的见解。这些见解可用于设计更清洁、更高效、更可靠的燃煤系统。将采用多尺度、分层方法，在良好控制的条件下获得的最先进的实验可用于研究个体现象（粒子点火、炭氧化/气化等），并且这种理解可以扩大到更复杂和实用的系统。这项研究将结合 OCC 的现有实验数据与清华大学收集的 MILD-OCC 系统新数据以及多尺度建模和仿真，以增进对 MILD-OCC 系统的理解。模拟和实验工作将紧密交织，实验结果用于验证模型，模拟用于指导实验测量需求。此外，还将重点关注仪器模型（促进实验和模拟之间的比较）以及模型升级技术，从高保真模型开始，然后进行粗化以获得适合实施的模型。该奖项由 CBET 环境可持续发展计划和国际科学与工程办公室共同资助。

1704141 Sutherland, James C.Oxy-coal combustion (OCC) is a viable technology that produces a concentrated carbon dioxide (CO2) stream suitable for sequestration. However, nearly all coal power plants in operation today, and most slated for construction, are air-fired power plants. Moderate and Intensive Low oxygen Dilution (MILD) combustion has been proposed as a technique to achieve higher combustion efficiencies, to produce higher uniformity in reaction zones, to reduce pollutant formation and to provide more uniform heat flux. This project aims to combine these two technologies and to investigate fundamental questions surrounding MILD oxy-coal combustion (MILD-OCC). Improved understanding of MILD-OCC can lead to viable retrofits or new designs for boilers that will not only improve efficiency but also provide sequestration-ready CO2 streams.This research is motivated by the hypothesis that simulation and experiments, analyzed together over a multi-scale range of conditions, can provide valuable insights into MILD-OCC systems. Such insights can be used to design cleaner, more efficient, and more reliable coal combustion systems. A multiscale, hierarchical approach will be undertaken whereby state of the art experiments obtained under well-controlled conditions can be used to study individual phenomena (particle ignition, char oxidation/gasification, etc.), and this understanding can be moved up-scale to more complex and practical systems. This research will combine existing experimental data of OCC with new data to be gathered at Tsinghua University on MILD-OCC systems and with multiscale modeling and simulation to improve understanding of MILD-OCC systems. The simulation and experimental work will be closely interwoven, with experimental results used to validate models and simulations used to guide experimental measurement needs. Additionally, focus on both instrument models (facilitating comparison between experiment and simulation) as well as techniques for upscaling models, beginning with high-fidelity models and coarsening to obtain models suitable for implementation, will be pursued. This award is co-funded by the CBET Environmental Sustainability program and the Office of International Science and Engineering.