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首页> 外文期刊>Preprints >Effect of Hydrogen Donor on the Thermal Stability of Paraffinic Jet Fuels Compared with Naphthenic Jet Fuels Under Oxidative and Non-Oxidative Flow Conditions
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Effect of Hydrogen Donor on the Thermal Stability of Paraffinic Jet Fuels Compared with Naphthenic Jet Fuels Under Oxidative and Non-Oxidative Flow Conditions

机译：在氧化和非氧化流动条件下，氢供体对链烷烃喷气燃料与环烷喷气燃料的热稳定性的影响

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摘要

The thermal stability of jet fuels, particularly in the pyroluytic regime, can be greatly enhanced by utilizing hydorgen donors typically found in coaldeived liquids (1,2). The current jet fuels are petroleum-derived and consequently rich in linear alkanes,which are highly susceptible to pyrolytic cracking. The addition of hydrogen donors have resulted in a marked increase in the thermal stability of linear alkanes when stressed under non-oxidative batch conditions (3,4). An additional problem with jet fuels is the presence of dissolved oxygen (from air), which may react with the fuel in the autoxidative regime around 150-250 deg C before the fuel and its oxygenated reaction proudcts enter the pyrolytic regime above 400 deg C (5-7). Although the pyrolytic conversion of alkanes in petroleum-derived jet fuels, which involves the formation of free radicals, can be halted right after the initiation step by the use of hydrogen donors, oxygen may react with the hydorgen donors reducing their ability to target the thermally induced radicals. Accordingly, the present study forcuses on the degradation of n-tetradecane ,as a model paraffinic jet fuel, stressed alone and with the addition of the hydrogen doron 1,2,3,4-tetrahydro-1-naphthol under non-oxidative and oxidative flow conditions, obtained by purging with nitrogen and air, respectively. The thermal stabiltiy of the model paraffinic jet fuel, with and without the hydrogen donor, was compared with the model naphthenic jet fuel, decahydronaphthalene, under non-oxidative and oxidative flow conditions. The hydrogen donor greatly reduced the thermal cracking of the n-tetradecane when stressed under nitrogen with bulk fuel exit temperatures from the flow reactor tube in the range of 500 to 700 deg C. The effect of the hydrogen donor on the stabilization of n-tetradecane was markedly reduced under oxidative conditions. However, the decahydronaphthalene showed comparabe thermal stability both under nitrogen and air.
机译：喷气燃料的热稳定性，特别是在热解状态下，可以通过利用煤衍生液体中常见的氢供体（1,2）大大提高。当前的喷气燃料是石油衍生的，因此富含直链烷烃，它们非常容易发生热解裂化。当在非氧化间歇条件下承受压力时，氢供体的添加导致线性烷烃的热稳定性显着提高（3,4）。喷气燃料的另一个问题是存在溶解的氧气（来自空气），氧气可能会在150-250摄氏度左右的自氧化状态下与燃料发生反应，然后燃料及其氧化反应会在400摄氏度以上进入热解状态（ 5-7）。尽管可以在引发步骤后立即通过使用氢供体来停止石油衍生的喷气燃料中烷烃的热解转化（其中涉及自由基的形成），但氧气可能会与氢供体反应，从而降低了它们靶向热目标的能力。诱发自由基。因此，本研究的重点是正链烷烃作为模型链烷烃喷气燃料的降解，在非氧化性和氧化性下单独施加压力，并添加1,2,3,4-四氢-1-萘氢氢流动条件，分别用氮气和空气吹扫。在无氧化和氧化流动条件下，将有和没有氢供体的石蜡模型喷气燃料的热稳定性与环烷喷气燃料十氢化萘进行了热稳定性比较。当氮在氮气中受到应力时，氢供体大大降低了正十四烷的热裂化，流动燃料反应器管中的散装燃料出口温度在500到700摄氏度之间。在氧化条件下显着还原。但是，十氢萘在氮气和空气中均表现出相对的热稳定性。

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