吸热型碳氢燃料高温结焦抑制方法研究进展

利用吸热型碳氢燃料作为冷却剂为高超音速飞行器提供主动热防护具有重大发展前景,但碳氢燃料在高温下结焦会造成传热恶化和系统热防护能力下降.因此,综述分析了碳氢燃料结焦的机理,并着重总结了碳氢燃料高温结焦的不同抑制方法.研究表明:惰性涂层能够覆盖反应管壁活性金属位点,抑制丝状焦;催化涂层不仅能够抑制丝状焦,也能够减少无定形焦...

Research Progress of Coking Suppression Methods for Endothermic Hydrocarbon Fuels at High Temperature

It is promising to use endothermic hydrocarbon fuelsas a coolant providing active thermal protection for hypersonic vehicles.However, hydrocarbon fuels can be coking at high temperatures and result inreduced thermal protection capability and heat transfer deterioration. In thisreview, mechanism of coking reactions in the process was briefly summarized.Then, coking suppression methodologies at high temperatures were summarized indetail. From literature, filamentous coking can be suppressed by covering theactive metal sites with inert coating; catalytic coating not only can suppressfilamentous coking, but also can reduce amorphous coking; coking inhibitor canreact with metal sites and deactivate them, and thus result in cokinginhibition. Especially, it is also reported that hydrogen donors in fuels cansuppress generation of coking precursors through the hydrogen transferreactions. In addition, it was found that coking reactions can be reducedthrough changing reactor shape and its wall roughness. Some promising researchon coking inhibition is also summarized. It is essential to develop effectivethermal protection technologies for efficient coking suppression methods.