CN103499611A - Diesel cetane number measuring method based on dielectric spectrum technology - Google Patents
Diesel cetane number measuring method based on dielectric spectrum technology Download PDFInfo
- Publication number
- CN103499611A CN103499611A CN201310482820.4A CN201310482820A CN103499611A CN 103499611 A CN103499611 A CN 103499611A CN 201310482820 A CN201310482820 A CN 201310482820A CN 103499611 A CN103499611 A CN 103499611A
- Authority
- CN
- China
- Prior art keywords
- diesel
- cetane
- diesel oil
- sample
- standard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to a diesel cetane number measuring method based on dielectric spectrum technology. A cetane number calibration model based on diesel dielectric spectrum data is built, and diesel cetane number is measured fast by using the built calibration model. The method specifically includes the steps of firstly, collecting representative standard diesel samples; secondly, using a national standard method to measure cetane number of the standard samples; thirdly, collecting the dielectric spectrum data of the standard diesel samples; fourthly, building the diesel cetane number calibration model based on the dielectric spectrum data of the standard diesel samples; fifthly, verifying and correcting the calibration model; sixthly, predicting cetane number of unknown diesel samples. Cetane number is an important index indicating diesel ignition quality, so that diesel cetane number measuring method researches are significant for diesel production and application. When sample volume is low or engine testing conditions are not satisfied, diesel cetane number can be replaced by cetane index, and measurement according to the method can be performed.
Description
Technical field
The present invention relates to the cetane rating calibration model of model based on diesel oil dielectric spectra data, then utilize the cetane rating of the calibration model Fast Measurement diesel oil of setting up.When sample size is few or do not possess the engine test condition, available cetane index replaces diesel cetane-number, according to this method, is measured.
Background technology
The present invention is a kind of method of utilizing the dielectric spectra characteristic parameter mensuration diesel cetane-number of diesel samples, and when sample size is few or do not possess the engine test condition, available cetane index replaces diesel cetane-number, according to this method, is measured.
Diesel cetane-number (cetane number CN) means the index of flammability when diesel oil burns in diesel engine.The cetane rating height illustrates the naturally lower of diesel oil, and ignition quality is good, and corresponding time lag of inflammation is short, and engine mildness, be not prone to pinking; Cetane rating is high simultaneously, and the cold cranking capacity of diesel engine is better.
Cetane index (cetane index CI) means a calculated value of distillate fuel ignition quality in engine.Cetane index can not arbitrarily be used for replacing the cetane rating of measuring with the model engine test unit, if but considered its limitation, can be used as a kind of supplementary means of prediction cetane rating: 1. in the situation that can not measure cetane rating by engine test, calculated cetane index is the effective ways of estimating cetane rating.2. when sample size less when being not enough to carry out engine test, generally can be with calculated cetane index as approximate cetane rating.3. in the situation that the cetane rating of certain distillate fuel is definite, the raw material and the production technology that need only this fuel remain unchanged, the cetane rating of the product of producing after cetane index can be used for checking.
At present, the diesel cetane-number assay method is measured according to GB/T386-2010 " diesel oil catch fire character determination method (cetane rating method) ".The diesel oil cetane index calculates according to GB/T11139-2004 " distillate fuel cetane index computing method " and SH/T0694-2000 " midbarrel fuel cetane index computing method (four variable equations) ".GB/T11139-2004 " distillate fuel cetane index computing method " is more applied widely than SH/T0694's " midbarrel fuel cetane index computing method (four variable equations) ".
GB/T11139-2004 " distillate fuel cetane index computing method " is from the standard density of distillate fuel and mid-boiling point temperature computation and obtain.(unit is g/cm to the density that 20 ℃ of temperature that standard density is China's regulation are
3), press the GB/T1884 method and measure.When the oil product that mid-boiling point refers to have symmetrical distillation curve distills under rated condition, gold-plating goes out the relevant temperature of 50% volume, by the GB/T6536 method, measures.
SH/T0694-2000 " midbarrel fuel cetane index computing method (four variable equations) " measures 15 ℃ of density of sample and 10%, 50% and 90% recovered (distilled) temperature according to standard test method.Utilize measured test figure, according to the formula or the chart that provide, adopt computing method or graphical method to obtain the cetane index of sample.
The limitation of cetane index is embodied in: 1. be not suitable for the fuel that is added with cetane number improver.2. the distillate fuel that is not suitable for pure hydrocarbon, synfuel, alkylates, coke chemicals and derives from oil shale fuel and oil-sand.If 3. for crude oil, asphaltum oil and the end point of distillation when the volatile products below 260 ℃, the correlativity of itself and cetane rating is basically inaccurate.
The cetane test method method, realization is complicated, test speed is slow, economic benefit is low and the feature of environmental protection is poor.Mainly there is the shortcoming that measuring accuracy is low, limitation is obvious, economic benefit is low in the cetane index computing method, so research diesel cetane-number and cetane index assay method rapidly and efficiently has important theory and realistic meaning.
This patent method has been set up the method for measuring diesel cetane-number based on dielectric spectra technology, reaches the purpose of Fast Measurement diesel cetane-number.After the method is built up, can measure fast and efficiently diesel cetane-number and cetane index, the testing process environmental protection; Sample is without pre-service; Analysis speed is fast, and reliability is high, easy to use, analysis cost is low.When sample size is few or do not possess the engine test condition, available cetane index replaces diesel cetane-number, according to this method, is measured.
Summary of the invention
Technical matters: the purpose of this invention is to provide a kind of method of utilizing dielectric spectra technology to measure diesel cetane-number, when sample size is few or do not possess the engine test condition, available cetane index replaces diesel cetane-number, according to this method, is measured.
Technical scheme
The present invention is a kind of method of utilizing dielectric spectra technology Fast Measurement diesel cetane-number, and the method comprises the following steps:
1) collect representational diesel oil standard sample: the diesel oil standard sample of indication comprises and meets standard GB/T 252-2011 " ordinary diesel oil " and meet the large class of standard GB/T 19147-2009 " derv fuel oil " two here.
2) adopt national standard method to measure the cetane rating of diesel oil standard sample, according to method be: GB/T386 " diesel oil catch fire character determination method (cetane rating method) ";
3) adopt the dielectric spectra instrument, gather the dielectric spectra data of diesel oil standard sample;
Dielectric spectra instrument described here is characterized in that: frequency range is: 0.1MHz～20MHz; Can obtain the dielectric response signal of sample at different excitation frequency points, here the dielectric response signal of indication can be for having the dissipation factor of concrete physical significance, complex permittivity value of real part, imaginary values etc., can be for not having the dielectric response signal of concrete physical significance yet.
4) set up the cetane rating calibration model based on diesel oil standard sample dielectric spectra data, concrete steps are as follows:
(1) diesel oil standard sample dielectric spectra data are carried out to pre-service, preprocess method is: after first derivation is processed, then carry out smoothing processing;
(2) adopt the partial least square method in chemometrics method, set up the diesel cetane-number calibration model;
5) checking and correction calibration model:
(1) adopt the accuracy of cross verification checking calibration model, the method is attempted the data of Application standard sample itself and is gone to simulate the data of unknown sample, to estimating the actual prediction ability of calibration model;
(2) according to validation-cross result of calculation, reject the standard model that predicated error exceeds standard, return to 4), until all validation-cross result of calculation meets precision requirement.
6) cetane rating of prediction diesel oil unknown sample, concrete steps are as follows:
(1) gather the dielectric spectra data of diesel oil unknown sample;
(2) diesel oil unknown sample dielectric spectra data are carried out to pre-service: after first first derivation is processed, then smoothing processing;
(3) the diesel cetane-number calibration model of the dielectric spectra data substitution of diesel oil unknown sample after pre-service being set up, calculate the cetane rating of diesel oil unknown sample.
When sample size is few or do not possess the engine test condition, available cetane index replaces diesel cetane-number, according to this method, is measured.
Beneficial effect
1) this method is to utilize dielectric spectra technology Fast Measurement diesel cetane-number.
2), when sample size is few or do not possess the engine test condition, available cetane index replaces diesel oil ten
Six alkane values, measured according to this method.
3) this method is applicable to the standard diesel samples, mainly comprises that to meet standard GB/T 252-2011 " general
Logical diesel oil " and meet the large class of standard GB/T 19147-2009 " derv fuel oil " two.
4) this method have simple and direct, quick, accurately reach the advantages such as testing expense is low.
The accompanying drawing explanation
Accompanying drawing 1:81 diesel oil standard sample dielectric spectra data and curves figure
Embodiment
The method that the present invention is based on dielectric spectra technology mensuration diesel cetane-number comprises the following steps:
1) collect representational diesel oil standard sample: the diesel oil standard sample of indication comprises and meets standard GB/T 252-2011 " ordinary diesel oil " and meet the large class of standard GB/T 19147-2009 " derv fuel oil " two here.
2) adopt national standard method to measure the cetane rating of diesel oil standard sample, according to method be: GB/T386 " diesel oil catch fire character determination method (cetane rating method) ".
3) adopt the dielectric spectra instrument, gather the dielectric spectra data of diesel oil standard sample;
The dielectric spectra frequency range is: 0.1MHz～20MHz, frequency interval is: 0.2MHz.
4) set up the diesel cetane-number calibration model, concrete steps are as follows:
(1) diesel oil standard sample dielectric spectra data are carried out to pre-service, preprocess method is: after first derivation is processed, then carry out smoothing processing;
(2) adopt the partial least square method in chemometrics method, set up the diesel cetane-number calibration model;
5) checking and correction calibration model:
(1) adopt the accuracy of cross verification checking calibration model, the method is attempted the data of Application standard sample itself and is gone to simulate the data of unknown sample, to estimating the actual prediction ability of calibration model;
(2) according to validation-cross result of calculation, reject the standard model that predicated error exceeds standard, return to 4), until all validation-cross result of calculation meets precision requirement, specifically can explain as follows:
The quality of the diesel cetane-number calibration models quality of setting up is estimated by the deviation size between standard method of test measured value and calibration model predicted value:
Deviation=measured value-predicted value
In above formula:
Measured value---adopt the standard method measured value;
Predicted value---calibration model validation-cross predicted value.
When absolute value of the bias meets the requirement of GB/T386 " diesel cetane method " repeatability, standard model is considered as qualified, when exceeding when GB/T386 " diesel cetane method " repeatability requires, absolute value of the bias rejects this standard model, return to 4), until all validation-cross result of calculation meets the requirements.
6) cetane rating of prediction diesel oil unknown sample, concrete steps are as follows:
(1) gather the dielectric spectra data of diesel oil unknown sample;
(2) diesel oil unknown sample dielectric spectra data are carried out to pre-service: after first first derivation is processed, then smoothing processing;
(3) the diesel cetane-number calibration model of the dielectric spectra data substitution of diesel oil unknown sample after pre-service being set up, calculate the cetane rating of diesel oil unknown sample.
When sample size is few or do not possess the engine test condition, available cetane index replaces diesel cetane-number, and the cetane index computing method are: GB/T11139 " distillate fuel cetane index computing method " or SH/T0694 " midbarrel fuel cetane index computing method (four variable equations) "
Further illustrate by the following examples the present invention.
Embodiment
Step 1: collect representational diesel oil standard sample
Adopt national standard method GB/T386 " diesel oil catch fire character determination method (cetane rating method) " to measure the cetane rating of diesel oil standard sample.
Collect altogether 81, diesel oil standard sample, wherein the ordinary diesel oil sample is 41, and 40, derv fuel oil sample is as shown in table 1 below:
Table 1: diesel oil standard sample list
Step 2: the dielectric spectra data that gather the diesel oil standard sample
(1) testing tool
This method is suitable for various model dielectric spectra instruments.The dielectric spectrometer that instrument of the present invention is Logistics Engineering College's development, " the dielectric response signal " that instrument gathers is a nondimensional physical quantity, its value reflection sample is in the size of the dielectric response of different excitation frequency points.The dielectric spectra test condition is:
1. excitation frequency scope: 0.1MHz～20MHz;
2. frequency interval: 0.2MHz;
3. excitation waveform: sine wave;
4. probe temperature condition: 50 ± 1 ℃ of constant temperature.
(2) testing procedure
1. whether the temperature of checkout environment meets the requirements 0～50 ℃, under the ambient temperature conditions of regulation, operates.
2. the start of dielectric spectra instrument is after 3 minutes, and whether the stability self check of inspection apparatus is passed through, and after instrument state is normal, enters sample analysis.
(3) diesel oil standard sample dielectric spectra data acquisition
The dielectric spectra data and curves figure of 81 samples that gather is shown in accompanying drawing 1.
Step 3: set up the diesel cetane-number calibration model
(1) pre-service of dielectric spectra data
Pretreatment mode is: after first order derivative is processed, then carry out smoothing processing.
(2) set up calibration model
Using sample number into spectrum, be that No. 71, general bavin 1～general bavin 30 and Che Chai 42～car bavin are as the diesel oil standard sample, and set up calibration model with this, sample number into spectrum be general bavin 32～general bavin 41 and Che Chai 72～car bavin 81 as the diesel oil unknown sample, verify the forecasting accuracy of the diesel cetane-number calibration model of foundation with this.Utilize offset minimum binary in Chemical Measurement to send out and set up calibration model, and adopt cross verification to be verified the accuracy of model, operation result is as shown in table 2 below:
Table 2: diesel cetane-number calibration model validation-cross result of calculation
As can be seen from Table 2, do not contain the prediction failed test sample in calibration model, need not reject failed test sample modeling again.
(3) prediction diesel oil unknown sample cetane rating
Sample number into spectrum be general bavin 32～general bavin 41 and Che Chai 72～car bavin 81 as the diesel oil unknown sample, bring its pretreated dielectric spectra data into set up diesel cetane-number calibration model, result of calculation is as shown in table 3 below:
Table 3: diesel oil unknown sample cetane rating predicts the outcome
As can be seen from Table 3, the deviation predicted the outcome of diesel oil unknown sample meet GB/T386 " diesel oil catch fire character determination method (cetane rating method) " defined the repeatability requirement.
Claims (3)
1. measure the method for diesel cetane-number based on dielectric spectra technology, it is characterized in that the method comprises the following steps:
1) collect representational diesel samples, comprise ordinary diesel oil and the large class of derv fuel oil two;
2) adopt national standard method to measure the cetane rating of diesel oil standard sample, according to method be: GB/T386-2010 " diesel oil catch fire character determination method (cetane rating method) ";
3) adopt the dielectric spectra instrument, gather the dielectric spectra data of diesel oil standard sample;
4) set up the cetane rating calibration model based on diesel oil standard sample dielectric spectra data, concrete steps are as follows:
(1) diesel oil standard sample dielectric spectra data are carried out to pre-service, preprocess method is: after first derivation is processed, then carry out smoothing processing;
(2) adopt the partial least square method in chemometrics method, set up the diesel cetane-number calibration model;
5) checking and correction calibration model:
(1) adopt the accuracy of cross verification checking calibration model, the method is attempted the data of Application standard sample itself and is gone to simulate the data of unknown sample collection, to estimating the actual prediction ability of calibration model;
(2) according to validation-cross result of calculation, reject the standard model that predicated error exceeds standard, return to 4), until all validation-cross result of calculation meets precision requirement;
6) cetane rating of prediction diesel oil unknown sample:
Concrete steps are as follows:
(1) gather the dielectric spectra data of diesel oil unknown sample;
(2) pre-service of diesel oil unknown sample dielectric spectra data: first first derivation smoothing processing again after processing;
(3), by the diesel cetane-number calibration model that after pre-service, the substitution of diesel oil unknown sample dielectric spectra data is set up, calculate the cetane rating of diesel oil unknown sample.
2. dielectric spectra instrument claimed in claim 1, it is characterized in that: frequency range is: 100KHz～20MHz; Can obtain the dielectric response signal of sample at different excitation frequency points, here the dielectric response signal of indication can be for having the dissipation factor of concrete physical significance, complex permittivity value of real part, imaginary values etc., can be for not having the dielectric response signal of concrete physical significance yet.
3. when sample size is few or do not possess the engine test condition, available cetane index replaces diesel cetane-number, according to this method, is measured; The cetane index value of diesel oil standard sample is measured according to GB/T11139 " distillate fuel cetane index computing method " or SH/T0694 " midbarrel fuel cetane index computing method (four variable equations) ".
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310482820.4A CN103499611A (en) | 2013-10-16 | 2013-10-16 | Diesel cetane number measuring method based on dielectric spectrum technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310482820.4A CN103499611A (en) | 2013-10-16 | 2013-10-16 | Diesel cetane number measuring method based on dielectric spectrum technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103499611A true CN103499611A (en) | 2014-01-08 |
Family
ID=49864839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310482820.4A Pending CN103499611A (en) | 2013-10-16 | 2013-10-16 | Diesel cetane number measuring method based on dielectric spectrum technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103499611A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483464A (en) * | 2014-11-19 | 2015-04-01 | 上海沪顺石化装备有限公司 | Device and method for determining cetane number of diesel and biodiesel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1204770A (en) * | 1997-07-08 | 1999-01-13 | 孙威 | Method and device for determination disel oil grade and cetane number |
| CN101021495A (en) * | 2007-03-23 | 2007-08-22 | 冯新泸 | Method for distinguishing petroleum products variety |
| CN101339150A (en) * | 2007-11-19 | 2009-01-07 | 冯新泸 | Method for determining octane number based on dielectric spectra technology |
| CN101858877A (en) * | 2010-06-04 | 2010-10-13 | 吉林大学 | Method for detecting mixing ratios of biodiesel blended fuels |
-
2013
- 2013-10-16 CN CN201310482820.4A patent/CN103499611A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1204770A (en) * | 1997-07-08 | 1999-01-13 | 孙威 | Method and device for determination disel oil grade and cetane number |
| CN101021495A (en) * | 2007-03-23 | 2007-08-22 | 冯新泸 | Method for distinguishing petroleum products variety |
| CN101339150A (en) * | 2007-11-19 | 2009-01-07 | 冯新泸 | Method for determining octane number based on dielectric spectra technology |
| CN101858877A (en) * | 2010-06-04 | 2010-10-13 | 吉林大学 | Method for detecting mixing ratios of biodiesel blended fuels |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483464A (en) * | 2014-11-19 | 2015-04-01 | 上海沪顺石化装备有限公司 | Device and method for determining cetane number of diesel and biodiesel |
| CN104483464B (en) * | 2014-11-19 | 2016-08-31 | 上海沪顺石化装备有限公司 | For measuring diesel oil and the device and method of biodiesel Cetane number |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Eldeeb et al. | Reactivity trends in furan and alkyl furan combustion | |
| CN101893561B (en) | Near infrared spectrum quick test method of new oil quality of lubricating oil | |
| CN101339150B (en) | Method for determining octane number based on dielectric spectra technology | |
| CN103983757A (en) | Transformer insulation thermal ageing state reliability evaluation method based on Weibull distribution | |
| CN104730099A (en) | Method of simultaneously measuring water content and oil content of oily sludge | |
| CN105004745B (en) | A method of viscosity of crude is predicted by nuclear magnetic resoance spectrum | |
| Corach et al. | Permittivity of diesel fossil fuel and blends with biodiesel in the full range from 0% to 100%: Application to biodiesel content estimation | |
| CN109142865A (en) | Consider the frequency domain spectra discrimination method of paper oil insulation interfacial polarization equivalent circuit parameter | |
| CN109632695A (en) | A kind of crosslinking polyethylene-insulated cable insulation ageing state characterizing method and device | |
| CN102338743B (en) | Mid-infrared spectrum method for identifying engine fuel type and brand | |
| CN103115889A (en) | Method for predicating sulphur content of crude oil by infrared transmittance spectroscopy | |
| CN103760307B (en) | Method for evaluating type of kerogen | |
| CN105093166A (en) | Electronic watt-hour meter field inspection method | |
| Monteiro et al. | 1H NMR and multivariate calibration for the prediction of biodiesel concentration in diesel blends | |
| CN103499611A (en) | Diesel cetane number measuring method based on dielectric spectrum technology | |
| CN103440425B (en) | A kind of method for building up of octane value regression model | |
| CN105974278B (en) | Oil clearance telegram in reply holds accelerated test method under low frequency mixed excitation based on Sine-Fitting | |
| CN100425975C (en) | Method for measuring character data of gasoline from near infrared light spectrum | |
| CN103134764B (en) | The method of prediction true boiling point curve of crude oil is composed by transmitted infrared light | |
| CN103760131A (en) | Real-time gasoline product attribute prediction method based on near infrared spectrum detection | |
| CN113792475B (en) | Moisture content assessment method considering transformer aging effect based on weighted KNN algorithm | |
| CN102252994A (en) | Method for rapid detection of quality index of motor fuel | |
| CN116008216A (en) | Method and apparatus for detecting oil blending | |
| CN113052249B (en) | Transformer winding fault type identification method based on support vector machine and current deviation coefficient | |
| RU2506571C1 (en) | Method for measuring quality of oil products |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: FENG XINLU KONG CHUNXIN GONG YINGZHONG Effective date: 20150630 Owner name: RARE SERVICE ENGINEERING COLLEGE OF CHINESE PLA. Free format text: FORMER OWNER: GUAN LIANG Effective date: 20150630 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20150630 Address after: 401311 Shapingba District University City, Chongqing Applicant after: Rare Service Engineering College of Chinese PLA. Address before: 401311 Chongqing City University of Shapingba City Logistics Engineering Institute Applicant before: Guan Liang Applicant before: Feng Xinlu Applicant before: Kong Chunxin Applicant before: Gong Yingzhong |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140108 |