CN-121980110-A - Oil product segmentation method and system for retaining boiling point curve characteristics of virtual components

CN121980110ACN 121980110 ACN121980110 ACN 121980110ACN-121980110-A

Abstract

The embodiment of the application provides an oil product segmentation method and system for retaining the boiling point curve characteristics of virtual components, wherein the oil product segmentation method comprises the steps of obtaining real boiling point data of an oil product; determining a real boiling point curve of an oil product by adopting a cubic spline interpolation method based on the real boiling point data, wherein the real boiling point curve comprises cubic function coefficients of each section and volume intervals corresponding to the sections, determining a real boiling point curve function of a mixed oil product by oil product mixing calculation based on the mole fraction of the oil product, performing oil product segmentation based on the real boiling point curve function of the mixed oil product to obtain a real boiling point curve of a virtual component, and updating the real boiling point curve of the virtual component based on the real boiling point curve of the virtual component and the volume fraction of the mixed oil product to obtain an updated real boiling point curve.

Inventors

QIN YUNFENG
LI ZHUOYI
Long Huilong
ZHANG ZENGFU
TANG HAORAN
LI ZHEN
MA YUAN

Assignees

圣泰(北京)软件科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (9)

1. An oil product segmentation method for retaining the boiling point curve characteristics of virtual components is characterized by comprising the following steps: acquiring real boiling point data of an oil product; Determining a true boiling point curve of the oil product by adopting a cubic spline interpolation method based on the true boiling point data; determining a true boiling point curve function of the mixed oil product through oil product mixing calculation based on the mole fraction of the oil product; Based on the real boiling point curve function of the mixed oil product, carrying out oil product segmentation to obtain a real boiling point curve of the virtual component; and updating the real boiling point curve of the virtual component based on the real boiling point curve of the virtual component and the volume fraction of the mixed oil product to obtain an updated real boiling point curve.
2. The method for oil product segmentation according to claim 1, wherein the determining the true boiling point curve function of the mixed oil product based on the mole fraction of the oil product through oil product mixing calculation specifically comprises: taking a union of a starting point of fraction volume fraction of the mixed oil product, an end point of fraction volume fraction and accumulated liquid phase outflow volume fraction of each oil product in the mixed oil product as a segmentation interval; And in the section interval, weighting by the coefficient of the true boiling point curve of the oil product and the mole fraction of the oil product to be used as the coefficient of the true boiling point curve function of the mixed oil product so as to determine the true boiling point curve function of the mixed oil product.
3. The method for oil product segmentation according to claim 1, wherein the oil product segmentation is performed based on a true boiling point curve function of the mixed oil product to obtain a true boiling point curve of a virtual component, specifically comprising: Based on a preset cutting rule, cutting out virtual components corresponding to each oil product of the mixed oil product from the real boiling point curve function of the mixed oil product, and obtaining the real boiling point curve of the virtual components.
4. The method for oil product segmentation according to claim 1, wherein the oil product segmentation is performed based on a true boiling point curve function of the mixed oil product to obtain a true boiling point curve of a virtual component, further comprising: the matrix, the segmented interval and the physical property data corresponding to the real boiling point curve of the virtual component are used as data sets and stored in a physical property database of the virtual component; Wherein, the The matrix corresponding to the real boiling point curve of the virtual component consists of coefficients of the real boiling point curve of the virtual component; the physical property data includes at least a characteristic factor, a relative density, and an average molecular weight.
5. The method for oil product segmentation as set forth in claim 1, wherein updating the real boiling point curve of the virtual component based on the real boiling point curve of the virtual component and the volume fraction of the mixed oil product to obtain an updated real boiling point curve comprises: And updating the real boiling point curve of the virtual component through volume interval calibration based on the real boiling point curve of the virtual component and the volume fraction of the mixed oil product, so as to obtain an updated real boiling point curve.
6. The method for oil product segmentation according to claim 5, wherein the updating the real boiling point curve of the virtual component by volume interval calibration based on the real boiling point curve of the virtual component and the volume fraction of the mixed oil product to obtain an updated real boiling point curve specifically comprises: Based on the volume fraction of each oil product of the mixed oil products before mixing, linearly stretching each oil product abscissa in the mixed oil products to the total volume fraction of the mixed oil products, and obtaining the volume fraction of each oil product of the mixed oil products after mixing; And carrying out weighted summation on the volume fraction of each oil product of the mixed oil products and the real boiling point temperature of the mixed oil products, updating the real boiling point curve of the virtual component, and obtaining the updated real boiling point curve.
7. The method of claim 6, wherein the linear stretching is performed on the abscissa of each oil in the mixed oil based on the volume fraction of each oil in the mixed oil before mixing to the total volume fraction of the mixed oil, so as to obtain the volume fraction of each oil in the mixed oil after mixing, specifically comprising: determining a mapping relation of virtual components based on the volume fraction of each oil product of the mixed oil products before mixing and the volume fraction of each oil product of the mixed oil products after mixing; And based on the mapping relation of the virtual components, linearly stretching the abscissa of each oil in the mixed oil to the total volume fraction of the mixed oil, thereby obtaining the volume fraction of each oil of the mixed oil.
8. The method of claim 6 wherein the total volume fraction of the blended oil is obtained based on a weighted sum of the mole fraction of each of the blended oils and the volume fraction of each of the blended oils.
9. An oil product segmentation system retaining the boiling point curve characteristics of virtual components, the oil product segmentation system comprising: The acquisition module is used for acquiring real boiling point data of the oil product; The determining module is used for determining a true boiling point curve of the oil product by adopting a cubic spline interpolation method based on the true boiling point data; The mixing module is used for determining a true boiling point curve function of the mixed oil product through oil product mixing calculation based on the mole fraction of the oil product; The cutting module is used for carrying out oil product segmentation based on the real boiling point curve function of the mixed oil product to obtain a real boiling point curve of the virtual component; And the updating module is used for updating the real boiling point curve of the virtual component based on the real boiling point curve of the virtual component and the volume fraction of the mixed oil product to obtain an updated real boiling point curve.

Description

Oil product segmentation method and system for retaining boiling point curve characteristics of virtual components Technical Field The embodiment of the application belongs to the technical field of chemical simulation, and particularly relates to an oil product segmentation method and system for retaining the boiling point curve characteristics of virtual components. Background Petroleum is a complex mixture of complex hydrocarbons and non-hydrocarbons. Because it contains a large number of different components, it is difficult to characterize them directly using a method of pure component mixing. Thus, in the petroleum refining industry, petroleum is typically characterized by means of virtual components. The current common dividing method of the virtual components is that firstly, an Engler distillation curve obtained through assay is converted into true boiling point data through a method provided by an API technical manual, and each data point comprises corresponding true boiling point temperature and volume/mass fraction. After the data points are obtained, a continuous true boiling point curve can be obtained by interpolation through a cubic spline method. According to the true boiling point curve, the same temperature or volume fraction is divided into a plurality of intervals, and each interval can be regarded as a virtual component. The average true boiling temperature for each interval can be considered the true boiling point of the virtual component. However, for some secondary processed oils, the actual boiling point curve tends to exhibit sharp increases in inflection points and gradients near the initial and final boiling points. After the average true boiling point is obtained, the curve obtained by interpolation is not used any more, and the characteristics of the curve are lost. The situation is unfavorable for separation and mixing of oil products, the physical properties are weighted directly during mixing, so that the original curve characteristics are lost, the curve is re-divided during separation, the characteristics such as inflection points and gradients are lost, the true boiling point of the separated or mixed product is inaccurate, and the deviation between the back calculated product and the original data is large. Based on this, there is a need for an oil segmentation method that preserves the boiling point profile characteristics of the virtual components. Disclosure of Invention The embodiment of the specification provides an oil product segmentation method and system for retaining the boiling point curve characteristics of virtual components, so as to solve part or all of the problems that in the prior art, the oil product segmentation method is unfavorable for separation and mixing of oil products, physical properties are directly weighted during mixing, so that the original curve characteristics are lost, the curve is segmented again during separation, the characteristics such as inflection points and gradients are lost, the true boiling point of the separated or mixed product is inaccurate, and the deviation between the back calculated product and the original data is large. In order to solve the above technical problems, the embodiments of the present specification are implemented as follows: the embodiment of the specification provides an oil product segmentation method for retaining the boiling point curve characteristics of virtual components, which comprises the following steps: acquiring real boiling point data of an oil product; Determining a true boiling point curve of the oil product by adopting a cubic spline interpolation method based on the true boiling point data; determining a true boiling point curve function of the mixed oil product through oil product mixing calculation based on the mole fraction of the oil product; Based on the real boiling point curve function of the mixed oil product, carrying out oil product segmentation to obtain a real boiling point curve of the virtual component; and updating the real boiling point curve of the virtual component based on the real boiling point curve of the virtual component and the volume fraction of the mixed oil product to obtain an updated real boiling point curve. The embodiment of the specification also provides an oil product segmentation system retaining the boiling point curve characteristics of virtual components, the oil product segmentation system comprising: The acquisition module is used for acquiring real boiling point data of the oil product; The determining module is used for determining a true boiling point curve of the oil product by adopting a cubic spline interpolation method based on the true boiling point data; The mixing module is used for determining a true boiling point curve function of the mixed oil product through oil product mixing calculation based on the mole fraction of the oil product; The cutting module is used for carrying out oil product segmentation based on the real boiling po