Calculation method for refined oil blending in oil depots

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Volume 19, Issue 8: Oil and Gas Storage and Transportation ·23· l§ iaitit~l ,∞ . ④ Calculation Methods for Blending Refined Oil in Oil Storage Tanks – Liu Lin’ - _ _ _ _ - - — — ● One (China National Petroleum Sales Corporation, Harbin Branch) Wang Ao ● - — — — — — One (China National Petroleum Sales Corporation, Daqing Branch) 6 7 f U Liu Lin, Wang Ying: Calculation Methods for Blending Refined Oil in Oil Storage Tanks, Oil & Gas Storage and Transportation, 2. 00, 1 9(8)23～26. The abstract describes the procedures for adjusting refined oil in storage tanks, the calculation process of quality index formulas, the methods for blending refined oil, and the precautions for such blending. In the calculation process of the quality indicators for blended oils, the calculation methods and steps for the blending ratios of quality indicators such as additive relationships, viscosity, octane number, flash point, and freezing point are mainly introduced, which provides practical reference for the quality management and blending of refined oils in oil depots. Keywords: degradation, calculation methods. For oil depots that store and distribute refined oil, in order to ensure a 100% quality rate for the refined oil, it is necessary to adjust the quality of oil that has been contaminated due to pipeline issues, accidents, or storage over extended periods, or to blend refined oil according to market demands so that its quality meets the specified standards. I. Blending of finished oils: Oil depots store a wide variety of finished oils, and some quality issues are inevitable during storage and transportation. To ensure the quality of these oils and to meet market demands, it is possible to blend finished oils of the same type together. Petroleum products of the same type are mutually soluble and can be blended in any proportion. If there are quality issues with the oil, the blending ratio can be determined using calculation formulas to produce a qualified product. II. General procedures for blending refined oil The general procedures for blending refined oil are as follows. (1) First, samples of the oil to be blended are taken for testing to obtain accurate quality parameter data. (2) Based on the quality index data, determine the mixing ratio through calculation or by referring to charts. (3) First, conduct a small-scale mixing test based on the mixing ratio; once the results of this test meet the relevant standards, large-scale mixing can be carried out using the same ratio. {Proverbial poison: (4) Recalculate the total amount of blending oil required, carry out the blending based on the blending ratio, and do so while giving full consideration to safety aspects.} (5) The blended oil can only be sent out or stored after passing the sampling and testing. III. Calculation Methods for Quality Indicators of Blended Oils 1. Calculation Method for the Blending Ratio of Additively Composable Quality Indicators (1) Density, acidity, acid number, residue carbon, ash content, sulfur content, actual gum content, boiling range, cetane number, etc., are additive quality indicators. When calculating the blending ratio for such quality parameters, it can be done using the following formula: x = …… In this formula, X represents the quality parameter that the blended oil is intended to meet ； Corpse — Mass percentage of Oil A in the blended oil ； Cadaver — Percentage by mass of Oil B in the blended oil ； x ——The value of the quality indicator related to oil type A ； x —— the value of the quality indicator related to oil type B. Inverse value: the gel content in oil component A is 0.02 mg/mL, while that in oil component B is 0.16 mg/mL. When blending these oils to obtain gasoline with a gel content of 0.04 mg/mL, by substituting these values into equation (1), the mixing ratio of components A and B can be determined. The result is x1 = –85.7 and x2 = 14.3. *15OOOl, No. 120, Dongda Zhi Street, Nangang District, Harbin City; Phone: (0451)2535657–8501. VIP Information: http://www.cqvip.com. It is possible to calculate blended oils for two-component systems; various types of blended oils can be produced using these two components. ⋯The value of a lamb can be calculated using both numerical methods and graphical approaches. _ ⋯ . . In equation T, “: “’ + B(3) represents the volume percentage of component A oil; —— the dynamic viscosity of component B oil, in m/s. The viscosity at sleeve 1 is 6X10^-m. For B-chai om, the calculation requires the adjustment at ‘three clicks’; it is given by …… f/A2, 16 + (1～)2·15·l·82Va + 2.41–2.4l, with the coordinates being 6X,10 m. / A dot represents one unit; ‘!’ represents poison. The value at point m is determined from the vertical coordinate of point c, and then from c to Lan c, which is 60 – this value represents the amount of oil allocated to B. ～ The rate chart of Bashe Mao Sai Zhu’s basket platform and timing: the values obtained are those within the range determined by the formula-based calculation of the viscosity. . ⋯ Shiganmai 1Do 1–(㈤4) —— The volume percentage of low-octane component oil ÷ c—— The constant for high-octane component oil. VIP Information: http://www.cqvip.com Volume 19, Issue 8; Liu Lin et al.: Calculation methods for the octane rating of refined oil in petroleum storage facilities. The blending constant C value for high-octane component oils is shown in Table 1. Table 1 Octane number constant C for tuning oils – Components of tuning oils, Names of tuning oil components, Name of the main component oil ； Catalytic cracking gasoline: 15, 1.23; Cascade or cracking: 10, 1.08; 30, 1.12; Gasoline 2O: 1.1 G; 45, 1.07; 4O: 1.02; Coking gasoline: 20, 1.21; Non-aromatic hydrocarbons: 5, 1.1; 8, 1.10; 50, 1.08; 2O: 1.02. Example 5: Component A has an octane number of 48 and a volume percentage of 50; component B has an octane number of 55 (coking gasoline) with a volume percentage of 50. Calculate the octane number of the blended oil. From Table 1, the blending constant C is found to be 1×10^8; substituting these values into Equation (4) yields ； In o8, the value is 75 3 100. Using the motor formula, the calculation becomes: N = N × 0.8 + 10 – 75.3 × 0.8 + 10 = 70.21. The octane rating of blended oils can also be estimated using an additive method. 4. Calculation of flash point: The flash point of blended oils can be determined either through calculation or by graphical methods. (1) Calculation method: The flash point of blended oils can be calculated using the following formula: x = …… In this formula, X represents the flash point of the blended oil℃ ； P —— The mass percentage of high-viscosity fuel in the mixture ； P —— The mass percentage of oils with a low flash point ； Flash point of high-flash-point oils ； Ding – the flash point of oils with a low flash point ； ,—— Constant. The flash point constant of the blended oil is shown in Table 2. Example 6: The flash point of Component A oil is 38°C, and that of Component B oil is 85°C. The mass percentage of Component A oil is 50%, while the mass percentage of Component B oil is also 50%. Calculate the flash point of the blended oil. The constant obtained from Table 2 is 25. g. Substituting this value into Equation (5) gives: 85×50 + 38×50 – 25. g×(85–38) / 100 – 4g°C. Table 2 shows the calculation constants for determining the flash point of fuel oils: FP FP FP FP JP2 Fj 95 3.3 40 60 21.7 75 25 30.4 100 6.5 45 55 23.9 80 20 29.2 150 9.2 50 50 25.9 85 15 26.0 200 80 11.9 55 45 27.6 900 10 21.0 250 75 14.5 600 40 29.0 900 5 12.0 300 70 17.0 650 35 30.0 350 60 1 9.4 700 30 30.3. (2) Graphical method: The flash point adjustment charts for fuel oils can be used. (See Figure 3) Estimated blending ratio for fuel oil flash point: 70, 60; proportion of Oil A: 90, 80, 70, 60, 50, 40, 30, 20, 10; proportion of Oil B: 55, 50, 48, 46, 44; pressure: 42; values for 10, 20, 30, 40, 50, 60, 70, 80, 90; proportion of Oil B