The development of a chemical kinetic mechanism for combustion in supercritical carbon dioxide
The development of a chemical kinetic mechanism for combustion in supercritical carbon dioxide
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DOI：
10.1016/j.energy.2022.124490
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发表时间：
2022-03
期刊：
影响因子：
9
通讯作者：
James M. Harman‐Thomas;K. Hughes;M. Pourkashanian
中科院分区：
文献类型：
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作者：
James M. Harman‐Thomas;K. Hughes;M. Pourkashanian
直接燃烧的超临界CO2（sCO2）动力循环允许气体燃料在具有固有碳捕获的氧燃料条件下燃烧。由于CO2是从本质上捕获的，因此整个电厂的捕获效率损失很小，这意味着发电厂在没有碳捕获和储存的情况下实现了与传统化石燃料发电厂相似的效率。然而，在高压和大量稀释的二氧化碳，燃烧机制知之甚少。因此，在本文中，灵敏度和定量分析的四个已建立的化学动力学机制已被用来确定最重要的反应和最好的执行机制在一系列不同的条件。CH3O2化学被确定为一个关键的机制组件建模甲烷燃烧超过200大气压。谢菲尔德大学（UoS）的sCO2机制在本工作中创建更好的模型点火延迟时间（IDT）的高压燃烧在一个大的稀释CO2。定量分析表明，UoS sCO2机制是最适合最大数量的IDT数据集，并具有最低的平均绝对误差值，从而表明与现有的四种化学动力学机制相比，性能上级，在低压条件下得到了很好的验证。
Direct fired supercritical CO2(sCO2) power cycles allow for the combustion of gaseous fuels under oxyfuel conditions with inherent carbon capture. As the CO2is captured intrinsically, the efficiency penalty of capture on the overall plant is small, meaning that power plants achieve a similar efficiency to traditional fossil fuel power plants without carbon capture and storage. However, at high pressures and in large dilutions of CO2, combustion mechanisms are poorly understood. Therefore, in this paper sensitivity and quantitative analysis of four established chemical kinetic mechanisms have been employed to determine the most important reactions and the best performing mechanisms over a range of different conditions. CH3O2chemistry was identified as a pivotal mechanism component for modelling methane combustion above 200 atm. The University of Sheffield (UoS) sCO2mechanism created in the present work better models the ignition delay time (IDT) of high-pressure combustion in a large dilution of CO2. Quantitative analysis showed that the UoS sCO2mechanism was the best fit to the greatest number of IDT datasets and had the lowest average absolute error value, thus indicating a superior performance compared to the four existing chemical kinetic mechanisms, well-validated for lower pressure conditions.