航空燃料结焦深度的光度法评价

Evaluation of coking severity for aviation fuel by spectrophotometry

飞行器在高速飞行时,吸热型碳氢燃料实现吸热反应的主要途径是燃料裂解,而裂解过程伴随的结焦成为高速飞行器应用碳氢燃料的主要障碍之一。对于结焦程度的了解和评价是目前关注的一个主要问题,因此建立一种简单快速评价结焦深度的方法有着重要的意义。基于裂解残液中多环芳烃对残液颜色的影响建立了一种评价航空燃料结焦深度的光度法。根据裂解残液的吸光度对碳氢燃料的结焦情况进行比较分析和半定量评价;对比不同压力、不同流量、不同裂解管径下裂解残液的吸光度和实际的结焦情况验证了该方法的可行性和重复性。从而为碳氢燃料结焦深度的比较分析和半定量评价提供了一种有效的手段。

The main pathway to realize the endothermic reaction of endothermic hydrocarbon fuel is pyrolysis when aircraft is flying at high speed. In the process of pyrolysis,the formation of coke has been inevitable,and it becomes one of the main obstacles for the application of hydrocarbon fuel. Therefore,it is significant to establish a convenient method for evaluation the coking severity. This article established the spectrophotometric method for the evaluation of the coking severity. This method was based on the influence of condensed aromatics on raffinate color. And this article comparative analyzed and semi-quantitative evaluated the situations of hydro-carbon fuel coking by using the absorbance of raffinate. Furthermore,the feasibility and repeatability of this method were proved by comparing the real situations of hydrocarbon fuel coking and the absorbance of the raffinate at different pressures,different flow rates and different diameters of the reactor. Consequently,an effective analysis method was provided for comparative and semi-quantitative evaluation of the aviation fuel coking.