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Modeling of the submicron particles formation and initial layer ash deposition during high temperature oxy-coal combustion
Proceedings of the Combustion Institute ( IF 3.4 ) Pub Date : 2020-07-31 , DOI: 10.1016/j.proci.2020.06.073
Zhonghua Zhan , Andrew Chiodo , Minmin Zhou , Kevin Davis , Dave Wang , Jacob Beutler , Marc Cremer , Yueming Wang , Jost O.L. Wendt

The future use of coal as a fuel for power generation in the US depends on the availability of financially viable technologies for capture and storage of CO2 emissions from power plants. Key second-generation candidates for CO2 capture include high temperature and pressurized oxy-firing of coal, which has the potential to increase efficiency, lower capital costs, avoid air ingress and reduce oxygen requirements. However, unquantified challenges, such as flame behavior, heat transfer, ash transformation, ash deposition and char oxidation, still exist for those technologies. This study specifically focuses on the formation of submicron particles and initial layer ash deposition during high temperature oxy-coal combustion. Previous work has shown that the initial layer deposits are mainly formed of submicron size ash aerosols transported by thermophoresis. Unfortunately, the importance of submicron particle deposition has not received much attention, probably due to the insignificant deposit mass and difficulty in prediction of the submicron particles formation. In this work, models including mineral matter vaporization model, scavenging model and deposition model are developed and applied into a three-dimensional CFD framework to predict the submicron particles formation and subsequent initial layer deposits formation. The model results are comparable to experimental data. The merits of this work are that it has led to the development of a novel approach to predict both submicron particle formation and initial layer ash deposition during oxy-coal combustion.



中文翻译:

高温氧煤燃烧过程中亚微米颗粒形成和初始层灰分沉积的建模

在美国,未来将煤用作发电燃料取决于能否获得经济上可行的技术来捕获和储存发电厂的CO 2排放。第二代关键候选CO 2捕集包括煤的高温和加压氧燃烧,这有可能提高效率,降低资金成本,避免空气进入并减少氧气需求。但是,对于这些技术,仍存在未量化的挑战,例如火焰行为,传热,灰分转化,灰分沉积和炭氧化。这项研究专门针对高温氧煤燃烧过程中亚微米颗粒的形成和初始层灰分沉积。先前的工作表明,初始层沉积物主要由通过热泳运输的亚微米尺寸的灰雾气溶胶形成。不幸的是,亚微米颗粒沉积的重要性尚未引起足够的重视,这可能是由于微不足道的沉积质量和难以预测亚微米颗粒形成的原因。在这项工作中,包括矿物质汽化模型,清除模型和沉积模型在内的模型被开发并应用于三维CFD框架中,以预测亚微米颗粒的形成以及随后的初始层沉积物的形成。模型结果与实验数据相当。这项工作的优点在于,它导致了一种新方法的开发,该方法可以预测氧煤燃烧过程中的亚微米颗粒形成和初始层灰分沉积。

更新日期:2020-07-31
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