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为了避免航空煤油在高热流条件下主动热防护过程中的结焦沉积,需要对航空煤油的热裂解和结焦沉积反应规律进行研究.通过考察航空煤油在不同反应条件下气液相产物以及结焦量,对航空煤油的热裂解结焦反应规律展开实验研究.结果表明:航空煤油中的烯烃组分的二聚反应和芳香烃的缩聚反应是导致结焦的重要反应.随着温度的升高,航空煤油的热裂解程度加剧,且主要结焦反应速率加快,因此航空煤油的结焦量随之上升,甲烷、乙烯等小分子气相产物体积分数也随之升高,液相产物中烷烃质量分数明显下降,芳香烃质量分数上升.压力的升高会导致工质在板内的停留时间增加,从而使得结焦反应更多的朝正反应移动,所以液相产物中芳香烃质量分数随压力的升高而明显增多.
In order to avoid the coking deposition of aviation kerosene during active thermal protection under high heat flux conditions, the pyrolysis and coking deposition reaction rules of aviation kerosene need to be studied.By investigating the gas-liquid products and the amount of coking in aviation kerosene under different reaction conditions, The experimental study on pyrolysis coking reaction of aviation kerosene shows that the dimerization reaction of olefin components and the polycondensation of aromatic hydrocarbons in aviation kerosene are the important reactions that lead to coking.With the increase of temperature, Therefore, the coking amount of aviation kerosene will increase accordingly. The volume fraction of small molecule gas phase products such as methane and ethylene will also increase, and the mass fraction of alkane in liquid phase products will decrease obviously. The aromatic hydrocarbons The increase of the mass fraction leads to the increase of the residence time of the working fluid in the plate and the coking reaction moves more toward the positive reaction. Therefore, the mass fraction of aromatics in the liquid phase products increases obviously with the increase of pressure.