一种石油产品闭口闪点无点火式测定系统

针对传统石油产品闪点测试方法耗时长、操作繁琐、危险系数大的缺点，提出了一种基于差压式微量快速蒸馏技术的石油产品闭口闪点无点火式测试系统。首先，利用该测试系统获取待测样品的蒸汽温度-压力变化曲线，对曲线进行归一化积分计算；其次，利用偏最小二乘法建立校正集样品曲线和标准闪点值之间的多元校正模型；最后，代入未知样品的蒸汽温度 压力曲线计算其闭口闪点。选取10种来自不同炼油厂、沸点在20~400 ℃范围内的石油产品，利用留一法进行验证计算，待测样品闭口闪点预测计算值平均绝对误差为0.33 ℃，平均相对误差为3.4%，表明该测试系统可以对石油产品闪点进行有效地预测，与采用GB/T 261标准方法测定的闪点实测值吻合较好。

An Innovated Non-Ignition Method and Apparatus to Determine Closed Flash Point of Petroleum Products

An innovated non-ignition method and apparatus to determine closed flash point of petroleum products based on micro rapid distillation is proposed and validated to overcome the shortcomings of traditional petroleum products flash point test method, which is time-consuming, cumbersome to operate and dangerous. An innovated apparatus has been designed and applied to obtain the normalized steam temperature-pressure profile of the test sample. Then, the multivariate correction model between the calibration curve of different samples and standard flash point can be established with using partial least square method. Therefore, the closed flash point of unknown samples can be calculated with applying the above multivariate correction model. Ten petroleum products with boiling point of 20-400 ℃ from different refineries were chosen to validate the model by leave-one-method. Compared with measured data, the mean absolute error of the calculated closed flash points is 0.33 ℃, and the average relative error is 3.4%. The proposed apparatus and calculation method can be used to determine flash point of petroleum products, and the results are very consistent with GB/T 261 standard method.