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.

氢气水热燃烧是H ₂ O/CO ₂混合工质热电联产技术中的关键工艺，是煤炭利用的新途径。本文采用详细的化学动力学结合化学动力学模拟方法对氢水热燃烧的可燃性和稳定性进行了评价。研究结果表明，在超临界水中，纯氢很难燃烧；然而，CO ₂可以显着减少着火延迟时间并降低氢气的临界着火温度。_{这是因为CO 2}产生的自由基积极参与氢氧化的链支化过程，促进氢点火和燃烧稳定性。与气体燃烧相比，氢气水热燃烧具有较低的着火温度，可以在较低的参数下燃烧。水在反应过程中具有活性，会产生点火所需的自由基，促进燃烧并影响反应路径，导致反应速度相对较慢。