Combustion modelling opportunities and challenges for oxy-coal carbon capture technology
Combustion modelling opportunities and challenges for oxy-coal carbon capture technology
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DOI：
10.1016/j.cherd.2010.11.010
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发表时间：
2011-09-01
影响因子：
3.9
通讯作者：
Williams, A.
中科院分区：
文献类型：
--
作者：
Edge, P.;Gharebaghi, M.;Williams, A.
氧煤燃烧是碳捕获和封存的主要技术之一。本文综述了氧煤燃烧模型发展的机遇和挑战，讨论了计算流体力学(CFD)相关领域的历史和最新进展，包括焦炭氧化、辐射、污染物的形成和去除(汞、氮氧化物和SOx)以及湍流的影响。CFD可用于评估和优化全尺寸改装设计，并提供匹配空气燃烧热负荷的数据。此外，CFD还可以用于提高燃烧效率，并确定在腐蚀、结渣、结垢和痕量污染物排放方面的潜在减少量。对于煤炭燃烧来说，瞬变模拟在计算上变得更加负担得起，这为模型的开发提供了机会。氧煤中高浓度的CO2和H2O会影响化学动力学速率、燃尽和灰分性质。通过加入气化反应的详细动力学机制，模型可以得到改进。此外，必须了解氧煤燃烧过程中污染物的形成和去除机理，以帮助选择烟气净化策略。由于CO2和H2O分子有很强的发射带，因此在氧煤模型中使用气体性质的光谱模型进行辐射换热可能是必要的。最后，本综述提供了一个连贯的近期和长期氧煤特定CFD子模型的开发策略，以模拟发电系统中复杂的氧煤燃烧过程、传热和污染物排放。(C)2010年化学工程师学会。爱思唯尔出版，版权所有。
Oxy-coal combustion is one of the leading technologies for carbon capture and storage. This paper presents a review of the opportunities and challenges surrounding the development of oxy-coal combustion models and discusses historical and recent advances in specific areas related to computational fluid dynamics (CFD), including char oxidation, radiation, pollutant formation and removal (Hg, NOx and SOx), and the impact of turbulence. CFD can be used to assess and optimise full-scale retrofit designs and to provide data on matching air-fired heat duties. In addition, CFD can also be used to improve combustion efficiency and identify potential reductions in corrosion, slagging, fouling and trace pollutant emissions. Transient simulations are becoming more computationally affordable for coal combustion, providing opportunities for model development. High concentrations of CO2 and H2O in oxy-coal can influence chemical kinetic rates, burnout and ash properties. The modelling can be improved by incorporating detailed kinetic mechanisms of gasification reactions. In addition, pollutant formation and removal mechanisms must be understood during oxy-coal firing to aid the selection of flue-gas cleaning strategies. Radiative heat transfer using spectral models for gaseous properties may be necessary in oxy-coal modelling because CO2 and H2O molecules have strong emission bands. Finally this review provides a coherent near-term and long-term oxy-coal specific CFD sub-models development strategy to simulate the complex oxy-coal combustion processes, heat transfer and pollutant emissions in power generation systems. (C) 2010 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.