Experimental and modelling study of syngas combustion in CO2 bath gas
Experimental and modelling study of syngas combustion in CO2 bath gas
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CO2浴气中合成气燃烧的实验与模拟研究
DOI：
10.1016/j.fuel.2023.127865
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发表时间：
2023
期刊：
影响因子：
7.4
通讯作者：
Harman-Thomas J
中科院分区：
文献类型：
--
作者：
Harman-Thomas J
由煤和生物质气化产生的合成气已被提出作为直接燃烧超临界动力循环的潜在燃料。例如，Allam-Fetvedt循环可以提供具有价格竞争力的电力生产，100%的固有碳捕获，同时利用约96%的二氧化碳稀释。在这项工作中，使用高压激波管在1100 - 1300 K的温度范围内，在co2稀释条件下（20和40 bar）测量了合成气的点火延迟时间（IDTs）。在本研究中，合成气混合物的等效比和H2:CO比是不同的。将这些数据集与AramcoMech 2.0和谢菲尔德大学超临界co2 22.0 （UoS sCO22.0）动力学模型的预测结果进行了比较。定量对比分析表明，UoS sCO22.0对合成气燃烧实验idt的预测能力更强。我们发现，co2和H反应生成CO和OH导致了两次h2co点火分离，这增加了测定IDTs的复杂性。我们研究了这一现象，并提出了一种确定模拟idt的方法，以便与实验idt进行有效比较。通过灵敏度和产率分析对比了合成气在co2和N2bath气体中燃烧的化学动力学。通过改变h2和CO的比例以及混合当量比，本工作为进一步开发和验证相关动力学机制提供了重要的co2浴气IDT数据。
Syngas produced from coal and biomass gasification has been proposed as a potential fuel for direct-fired supercritical power cycles. For instance, the Allam-Fetvedt cycle can offer price-competitive electricity production with 100 % inherent carbon capture while utilizing CO2dilution of about 96 %. In this work, ignition delay times (IDTs) of syngas have been measured in CO2diluted conditions using a high-pressure shock tube at two pressures (20 and 40 bar) over a temperature range of 1100 – 1300 K. Syngas mixtures in this study were varied in equivalence ratio and H2:CO ratios. The datasets were compared against the predictions of AramcoMech 2.0 and the University of Sheffield supercritical CO22.0 (UoS sCO22.0) kinetic models. Quantitative comparative analysis showed that the UoS sCO22.0 was superior in its ability to predict the experimental IDTs of syngas combustion. We found that the reaction of CO2and H to form CO and OH caused the separation of H2and CO ignition in two events, which increased the complexity of determining the IDTs. We investigated this phenomenon and proposed a method to determine simulated IDTs for an effective comparison against the experimental IDTs. The chemical kinetics of syngas combustion in a CO2and N2bath gas are contrasted by sensitivity and rate-of-production analyses. By altering the ratio of H2and CO as well as mixture equivalence ratio, this work provides vital IDT data in CO2bath gas for further development and validation of relevant kinetics mechanisms.