基于逐步回归的生物航煤属性鉴别OA

Current aviation jet fuel specifications only prescribe basic technical indicators,thus cre-ating a regulatory gap because they cannot effectively distinguish between conventional petroleum-de-rived sources,bio-based sources,or their blends.To address this issue,a stepwise identification strategy comprising component screening,rapid physicochemical qualitative analysis,and bio-based carbon content confirmation is proposed for the attribute identification of hydroprocessed esters and fatty acids synthetic paraffinic kerosene(HEFA-SPK).First,gas chromatography-mass spec-trometry is performed to screen the carbon number distribution;samples outside the typical aviation fuel range(C6-C17)are excluded.Subsequently,rapid qualitative discrimination is achieved based on density and aromatic content,supplemented by distillation range and flash point as auxiliary pa-rameters for a comprehensive evaluation.Finally,bio-based carbon content serves as the key evi-dence:a measured content above 97.0%identifies HEFA-SPK,while a value below 0.5%indicates petroleum-based jet fuel.For intermediate blending ratios(1%-30%),a stepwise regression ap-proach is employed to develop a predictive model for the blending ratio of bio-based fuel,and the model is validated via a paired t-test.Results show that the linear regression model based on flash point,distillation range,and biogenic carbon content accurately predicts the blending ratio(R²>0.99),thus providing reliable technical support for the quality supervision and source identification of bio-based aviation fuel.