Experimental and modelling study of hydrogen ignition in CO2 bath gas
Experimental and modelling study of hydrogen ignition in CO2 bath gas
复制标题
CO2浴气体中氢气点火的实验与模型研究
DOI：
10.1016/j.fuel.2022.126664
复制
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
以天然气或合成气为基础的直燃式超临界二氧化碳动力循环已被提议作为未来能源技术，能够 100% 碳捕获，且价格与现有化石燃料技术具有竞争力。同样，蓝色或绿色氢可用于发电，以应对可再生能源技术的间歇性。在这项工作中，在超过 1050 – 1300 K 的高浓度 CO2 气体和 20 至 40 bar 的压力下测量了氢气的点火延迟时间 (IDT)。使用 AramcoMech 2.0 和谢菲尔德大学超临界 CO2 (UoS sCO22.0) 化学动力学机制将测量数据集与化学动力学模拟进行比较。最近开发了 UoS sCO22.0 机制来模拟 CO2bath 气体中甲烷、氢气和合成气的 IDT。敏感性分析用于识别重要的反应并说明在各种数据集中观察到的趋势。通过比较预测和实验 IDT 之间的平均绝对误差，对两种机制的性能进行了定量评估，这表明 UoS sCO22.0 是模拟 CO2bath 气体中氢 IDT 的优越机制。 OH 时间历程的重要性被认为是进一步验证动力学机制的最合适的下一步。
Direct-fired supercritical CO2power cycles, operating on natural gas or syngas, have been proposed as future energy technologies with 100 % carbon capture at a price competitive with existing fossil fuel technologies. Likewise, blue or green hydrogen may be used for power generation to counter the intermittency of renewable power technologies. In this work, ignition delay times (IDTs) of hydrogen were measured in a high concentration of CO2bath gas over 1050 – 1300 K and pressures between 20 and 40 bar. Measured datasets were compared with chemical kinetic simulations using AramcoMech 2.0 and the University of Sheffield supercritical CO2(UoS sCO22.0) chemical kinetic mechanisms. The UoS sCO22.0 mechanism was recently developed to model IDTs of methane, hydrogen, and syngas in CO2bath gas. Sensitivity analyses were used to identify important reactions and to illustrate the trends observed among various datasets. The performance of both mechanisms was evaluated quantitatively by comparing the average absolute error between the predicted and experimental IDTs, which showed UoS sCO22.0 as the superior mechanism for modelling hydrogen IDTs in CO2bath gas. The importance of OH time-histories is identified as the most appropriate next step in further validation of the kinetic mechanism.