Journal
JOURNAL OF SUPERCRITICAL FLUIDS
Volume 188, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.supflu.2022.105677
Keywords
Hydrogen combustion; Supercritical H O-2; CO (2) mixtures; Chemistry kinetics; Numerical simulation
Categories
Funding
- National Key Research and Development Program of China [2020YFA0714400]
- Na-tional Natural Science Foundation of China [51888103, 51925602]
- Fundamental Research Funds for the Central Universities
Ask authors/readers for more resources
This study evaluated the flammability and stability of hydrogen hydrothermal combustion using detailed chemical kinetics and simulations. The results show that pure hydrogen is difficult to burn in supercritical water, but CO2 can reduce the ignition delay time and ignition temperature of hydrogen. Compared to gas combustion, hydrogen hydrothermal combustion has a lower ignition temperature.
Hydrothermal combustion of hydrogen is a key process in the H2O/CO2 mixed working medium thermal power generation polygeneration technology, a new coal utilization path. The flammability and stability of hydrogen hydrothermal combustion were evaluated using detailed chemical kinetics coupled with the chemical dynamics simulation method in this paper. The findings reveal that in supercritical water, pure hydrogen is difficult to burn; however, CO2 can dramatically reduce the ignition delay time and lower the critical ignition temperature of hydrogen. This is because free radicals produced by CO2 are actively involved in the chain-branching process of hydrogen oxidation, which promotes hydrogen ignition and combustion stability. Compared with gas combustion, hydrogen hydrothermal combustion has lower ignition temperature and can combust at lower parameters. Water is active in the reaction process, which produces the necessary free radicals for ignition, promotes combustion and influences the path of reaction, resulting in a relatively slow reaction rate.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available