ISO 4264:2018 石油产品 用四变量方程计算中馏分油的十六烷指数
标准编号：ISO 4264:2018
中文名称：石油产品 用四变量方程计算中馏分油的十六烷指数
英文名称：Petroleum products — Calculation of cetane index of middle-distillate fuels by the four variable equation
发布日期：2018-06
标准范围
本文件规定了计算石油衍生来源的中间馏分燃料十六烷值的程序。计算值被称为“四变量方程的十六烷值指数”。在本文件的其余文本中，术语“十六烷值”是指四变量方程的十六烷值。本文件适用于含有来自焦油砂和油页岩的非石油衍生物的燃料。它不适用于纯碳氢化合物，也不适用于源自煤的馏分燃料。十六烷值计算不考虑用于提高十六烷值的添加剂的影响。注1本文件最初是使用燃料基质开发的，其中一些燃料含有来自焦油砂和油页岩的非石油衍生物。注2十六烷值指数不是表示十六烷值的替代方法；它是一种补充工具，在使用时应适当考虑其局限性。注3当测试发动机无法直接确定该特性时，或当发动机额定值样本不足时，十六烷指数用于估计柴油的十六烷值。适用于本文件的最合适的燃料特性范围如下:燃料性质范围十六烷值32,5至56,515°C时的密度，kg/m3805,0至895,010%（V/V）蒸馏回收温度，℃171至25950%(V/V)蒸馏回收温度，°C212至30890%（V/V）蒸馏回收温度，℃251至363在十六烷值范围（32.5至56.5）内，对于65%的检验馏分燃料，通过十六烷值指数方程预测的预期误差将小于±2个十六烷值。对于性能超出该应用范围的燃料，误差可能更大。由于观察到的样品特异性偏差，即使燃料的特性落在推荐的应用范围内，预期误差也可能更大。因此，用户可以评估所需的预测一致性程度，以确定预测的适用性。注4:对于含有FAME（脂肪酸甲酯）的馏分燃料，观察到样品特异性偏差。
This document specifies a procedure for the calculation of the cetane index of middle-distillate fuels from petroleum-derived sources. The calculated value is termed the "cetane index by four-variable equation". Throughout the remaining text of this document, the term "cetane index" implies cetane index by four-variable equation.This document is applicable to fuels containing non-petroleum derivatives from tar sand and oil shale. It is not applicable to pure hydrocarbons, nor to distillate fuels derived from coal. Cetane index calculations do not take into account the effects from additives used to enhance the Cetane number.NOTE 1 This document was originally developed using a matrix of fuels, some of which contain non-petroleum derivatives from tar sands and oil shale.NOTE 2 The cetane index is not an alternative way to express the cetane number; it is a supplementary tool, to be used with due regard for its limitations.NOTE 3 The cetane index is used to estimate the cetane number of diesel fuel when a test engine is not available to determine this property directly, or when insufficient sample is available for an engine rating.The most suitable range of fuel properties for application of this document is as follows:Fuel propertyRangeCetane number32,5 to 56,5Density at 15 °C, kg/m3805,0 to 895,010 % (V/V) distillation recovery temperature, °C171 to 25950 % (V/V) distillation recovery temperature, °C212 to 30890 % (V/V) distillation recovery temperature, °C251 to 363Within the range of cetane number (32,5 to 56,5), the expected error of the prediction via the cetane index equation will be less than ±2 cetane numbers for 65 % of the distillate fuels examined. Errors can be greater for fuels whose properties fall outside this range of application.As a consequence of sample-specific biases observed, the expected error can be greater even when the fuel's properties fall inside the recommended range of application. Therefore, users can assess the required degree of prediction agreement to determine the fitness-for-use of the prediction.NOTE 4 Sample specific biases were observed for distillate fuels containing FAME (fatty acid methyl ester).
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