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Method for determining diesel oil cetane number

A technology of cetane number and determination method, applied in the field of analytical chemistry, can solve problems such as failure to improve analysis efficiency, and achieve the effects of saving standard fuel, small relative standard deviation and good repeatability

Active Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although the cost of test equipment has decreased, the efficiency of analysis has not improved

Method used

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  • Method for determining diesel oil cetane number
  • Method for determining diesel oil cetane number
  • Method for determining diesel oil cetane number

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Embodiment 1 fuel air flow measurement

[0099] Equipment condition:

[0100] Measuring machine: FCD-II type cetane number machine, the specific structure and working process can be found in the Chinese utility model patent (publication number CN 204060947U, authorized announcement date December 31, 2014).

[0101] The fuel air volume is determined by the following method:

[0102] (1) Setting parameters

[0103] Check the operating system to make it meet the requirements for the operation of the engine test typical diesel;

[0104] (2) Filling with fuel

[0105] Add the fuel to be tested into the fuel tank, rinse the measuring tube carefully, remove the air in the pipeline from the fuel tank to the pump, set the fuel switching valve to the position where the fuel is used to operate the engine, and start the motor;

[0106] (3) Adjust the injector flow

[0107] Under the following standard conditions, adjust the injector flow rate to 6.7±0.1mL / min or 180s±3s for 20mL...

Embodiment 2

[0122] Example 2 Air Volume-Cetane Number Curve and Air Volume-Cetane Number Power Curve Formula Establishment

[0123] Based on the FCD-Ⅱ cetane number machine, the air volume-cetane number curve and the air volume-cetane number power curve formula are established by the following methods:

[0124] Secondary standard fuel T-26 (75.2CN) and U-19 (19.4CN) are prepared into a series of standard fuels with different cetane numbers according to the ratio shown in table 3, and each standard is tested according to the method described in Example 1 The air volume of the fuel is shown in Table 3 for the measurement results.

[0125] Table 3 Relationship between standard fuel air volume and cetane number

[0126]

[0127] Taking the air volume as the abscissa and the cetane number as the ordinate, draw the air volume-cetane number curve of the measuring machine, see figure 1 . Depend on figure 1 For the air volume-cetane number curve shown, the power curve formula is established...

Embodiment 3

[0131] The investigation of embodiment 3 precision

[0132] Get different diesel oil samples, under the operating conditions of embodiment 1, on the described FCD-II type cetane number machine, measure the air volume of different diesel oil samples, each sample repeats measurement 5 times, the same diesel oil test The test was repeated at an interval of 0.5 minutes, and the results are shown in Table 4. Substitute the air volume measured each time into the power curve formula obtained in Example 2, calculate the cetane number of the sample, and calculate the range, repeatability, standard deviation and relative standard deviation. The results are shown in Table 5.

[0133] Table 4 Air volume measurement results of precision experiment

[0134]

[0135]

[0136] Table 5 Precision inspection results (unit: CN)

[0137]

[0138] Table 5 shows that the method of the present invention measures the cetane number of different diesel oil samples, the maximum difference of ...

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Abstract

The invention provides a method for determining diesel oil cetane number. A method is used for determining cetane number of diesel oil by establishing a relation between air quantity of fuel and cetane number; the method comprises the following steps: establishing a cetane number determining machine air quantity-cetane number power curve formula, and determining cetane number of diesel oil fuel. The air quantity is air input when the fuel reaches a prescribed ignition delay period during a combustion process in a standard operation condition. The air quantity-cetane number power curve method has the advantages of good repeatability and high precision, and small relative standard deviation; and the method satisfies the requirements of method reproducibility in a GB / T386-2010 standard.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to a method for measuring the cetane number of diesel oil by using an air volume FCD power curve, so as to be able to analyze the antiknock performance of diesel oil. Background technique [0002] Generally, diesel engines are four-stroke compression ignition engines, and the four strokes are intake stroke, compression stroke, working stroke and exhaust stroke. Among the four strokes, only the working stroke is valuable. In this stroke, when the piston moves upwards to the top dead center, the air in the cylinder is compressed to high temperature and high pressure, diesel is injected into the cylinder and starts to burn by itself, and the gas expands. Generate power to push the piston to run from top to bottom, and drive the crankshaft to rotate through the connecting rod. The combustion process of diesel in the diesel engine, from the beginning of fuel injection to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/22
Inventor 王海青丁明林武金伦江兴珠于林戴磊章连荣李舜陈晓敏柯圣钦杨琦吴林选
Owner CHINA PETROLEUM & CHEM CORP
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