CN104777198A - Differential comparison method octane value determinator - Google Patents
Differential comparison method octane value determinator Download PDFInfo
- Publication number
- CN104777198A CN104777198A CN201410009318.6A CN201410009318A CN104777198A CN 104777198 A CN104777198 A CN 104777198A CN 201410009318 A CN201410009318 A CN 201410009318A CN 104777198 A CN104777198 A CN 104777198A
- Authority
- CN
- China
- Prior art keywords
- differential
- capacitance
- differential comparison
- octane value
- comparison
- 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
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses key technology of a differential comparison method octane value determinator, and provides an octane value determinator suitable for oil refineries, fuel oil heat-engine plants, and gas stations. The differential comparison method octane value determinator is characterized in that: a reference oil product sample and an oil product sample to be measured are subjected to on-line differential comparison; the essential difference of the differential comparison method with the capacitance method is that: comparison process of the differential comparison method is completed in conversion into digital value, and the capacitance method is realized via manual calculation after obtaining of dielectric constants; the capacitance method is used for off-line comparison, and the differential comparison method is used for on-line comparison. According to measuring principles of the differential comparison method, nonlinear measurement of the capacitance method is changed into differential measurement via on-line compensation; the capacitance method is used for measuring charging time consumed by a single capacitance of pre-tender parameters to reach a set voltage; and the differential comparison method is used for measuring voltage difference when a sample power supply is used for charging of differential capacitances. According to instrument structure, three coaxial cylindrical conductors are used for forming a differential capacitance sensor; a measuring module and the sensor are combined; and digital facility is used for reading and displaying.
Description
Technical field
The invention discloses the gordian technique of a kind of gasoline, diesel oil (being referred to as oil product herein) octane number determination instrument.This patent product is mainly used in refinery, the oil product octane value Quick Measurement of fuel oil thermal power station.
Background technology
Octane value defines: in oil product, the number percent of the content of isooctane is called octane value (being commonly called as oil product label), and the anti-knock properties of isooctane (2,2,4-trimethylpentane) are better, and 100% is the oil product of isooctane, and octane value is 100.And the anti-knock properties of normal heptane are poor, the octane value of the normal heptane of 100% is 0.
The mensuration of oil product octane value is with isooctane and normal heptane for master sample, by standard conditions, laboratory standard Single Cylinder Gasoline Engine undertaken by pairing comparision.The ratio of adjustment criteria sample composition, the knock intensity that master sample is produced is identical with sample to be tested, and the percent by volume now in master sample shared by isooctane is exactly the octane value of sample to be tested.
Current oil product octane number determination method is divided into two kinds substantially: i.e. analytic approach and instrumental measurement.Wherein, analytic approach is divided into again pinking method, motor method and spectroscopic methodology, and analytical approach is universally recognized transaction measuration method in the world; Instrumental measurement is exactly Method of Dielectric Coefficient or is called capacitance method.Instrumental measurement controls to use as the technological process of production substantially, is rarely used in transaction metering.Differential comparison method belongs to the one of instrumental measurement from the angle of classification, but, what it adopted is online comparative approach, be different from the off-line numerical value comparative approach of capacitance method, it is higher that it obtains precision than existing electric capacity determination method, stability is better, may be become a kind of transaction measuration method newly by accreditation.
(1) determination method is analyzed
Analysis sensing equipment is bulky, and determination period is long, and equipment manufacturing cost is expensive, be applicable to inspection center and Large-scale Refinery use, because they are huge with the technology path gap of instrumental measurement, and this patent product has no similarity, omits the technical Analysis to them here.
(2) capacitance method octane number determination instrument
Learn from physicochemical analysis: specific inductive capacity and the octane value of oil product have positive correlation, and when the specific inductive capacity of oil product is larger, octane value is also higher.Therefore, if the octane value of known wherein a kind of oil product, after measuring unknown oil product and the ratio of the specific inductive capacity of known oil product, just can calculate the octane value of unknown oil product, thus realize the mensuration of oil product octane value.Capacitance method octane number determination instrument is based on this principle design.
1) structure
Capacitance method octane number determination instrument forms capacitive transducer by two silver coaxial conductors of tubular, it is an electric capacity/frequency translation module in base, comprise a temperature sensor in module, frequency signal and temperature signal are gathered and display module by wire connection data.
Fig. 1 is structural drawing and the equivalent circuit diagram of traditional capacitance method octane number determination instrument.
2) measuring principle
According to the theory of electromagnetic field, the electric capacity of coaxial tubular capacitor is: C=2 π ε L/ln (R/r); In formula, ε is the specific inductive capacity of medium between two-plate, and L is tube length degree, and R is outer pole plate radius, and r is internal layer pole plate radius.In based Capacitor Tester, L/ln (R/r) is constant K, ε=f (O
x) O
xfor octane value, that is specific inductive capacity is the function of octane value, as long as measure electric capacity just can calculate acquisition specific inductive capacity, can obtain octane value by look-up table.
Very difficult owing to directly measuring electric capacity, the train of impulses of the cycles such as usual employing one and width charges to capacitor, until when capacitor voltage at both ends reaches settings, and complete charge, the umber of pulse calculating charging just can calculate electric capacity, so-called electric capacity/frequency inverted that Here it is.
Mensuration process and analytic approach similar, first, configure the master sample of some known octane values, test the specific inductive capacity of its correspondence and preserve in memory, the specific inductive capacity of test testing sample, compare with the specific inductive capacity of master sample, after temperature adjustmemt and non-liner revision are carried out to the data obtained, obtain the octane value of sample to be tested.
3) error analysis
Specific inductive capacity is not only the function of octane value, or the function of temperature and electrical noise, that is:
＝f(O
x，T
t，E
t)
Environment temperature is less for vacuum condenser impact, but it is very large on the impact of medium, we be difficult to ensure to the mensuration of master sample with to test sample be determined at identical temperature environment under complete, even if add temperature sensor to correct temperature impact, but because the error of temperature survey itself and the error of corrected Calculation exist, temperature impact can not be eliminated completely.
The electrical noise of measurement environment is a random function, and when whole measuring system is an open cycle system, may not disturb by stress release treatment, it is the another one factor causing measuring error.
Main error is still from measuring system itself, it is based on a kind of like this hypothesis that electric capacity/frequency conversion method is set up: the voltage at electric capacity two ends is directly proportional to the duration of charging linear relationship, in fact, when charging voltage is steady state value, the voltage at electric capacity two ends is exponential functions of time, in just during certain, we regard linear function as it, and due to the limitation of the precision of voltage measurement, small voltage error will cause larger pulse train quantitative error.
The differential comparison method that patent of the present invention adopts, by effectively eliminating the error of above-mentioned three aspects, obtains high-precision octane value.
Summary of the invention
(1) patent of invention general introduction
Patent of the present invention have employed three coaxial tubular conductors and forms differential capacitance sensor, achieves standard oil sample and the online differential comparison of test sample.Under two samples are in same temperature environment and electric signal environment, completely eliminate the impact of temperature error, common-mode noise error, again because two electric capacity share same charge power supply, the synchronous nonlinear compensation of calculus of differences circuit realiration, fundamentally eliminate the nonlinearity erron of capacitance method, the high precision instrument achieving oil product octane value is measured.
(2) structure
Differential comparison method octane number determination instrument forms differential capacitance sensor by three silver coaxial conductors of tubular, it is a differential voltage measurement module in base, directly differential voltage signal is converted to digital signal to export, output interface is standard usb communication interface, can directly be connected reading data with smart mobile phone, panel computer, notebook, desk-top computer.
Fig. 2 is structural drawing and the equivalent circuit diagram of differential comparison method octane number determination instrument
Tubular conductor is respectively R by the diameter outside interior
1, R
2, R
3, and its length is identical, so:
Their proportionate relationship must meet following formula:
(3) measuring principle
Select the master sample of one group of known octane value, using the master sample closest to mean value as baseline sample, baseline sample is positioned in outermost measuring vessel, and tightens enclosing cover.Other samples are placed in internal layer measuring vessel in order one by one, measure the specific inductive capacity difference of each sample relative to baseline sample, and organized data form.Then, by unknown oil product sample to be measured down to internal layer measuring vessel, measure the specific inductive capacity difference of unknown sample relative to baseline sample, by tabling look-up and the accurate unknown oil product octane value of linear compensation acquisition.
Benefit of the present invention
1) measuring accuracy of octane value instrumental measurement is improved 10 to 20 times by the present invention, and the octane value of baseline sample and sample to be tested is more higher close to precision.
2) by improving the Dosimetry measurement standard relevant with amendment, can by the assay system of products substitution costliness corresponding for the present invention.
3) the present invention adopts general smart mobile phone, panel computer and computing machine as reading device, does not need special readout instrument, reduces production cost, and uses convenient.
Claims (3)
1. the object of this invention is to provide a kind of octane value surveying instrument (system) being applicable to refinery, fuel oil thermal power plant, refuelling station's use, patent of the present invention have employed three coaxial tubular conductors and forms differential capacitance sensor, achieves standard oil sample and the online differential comparison of test sample.Under two samples are in same temperature environment and electric signal environment, completely eliminate the impact of temperature error, common-mode noise error, again because two electric capacity share same charge power supply, the synchronous nonlinear compensation of calculus of differences circuit realiration, fundamentally eliminate the nonlinearity erron of capacitance method, the high precision instrument achieving oil product octane value is measured.
2. the feature based on patent 1 is: adopt benchmark oil product sample and the online differential comparison of oil product sample to be measured, the essential distinction of it and capacitance method is, the comparison procedure of this patent completes converting among digital quantity, and capacitance method is after obtaining specific inductive capacity, by manually having calculated, capacitance method is that off-line compares, and this patent compares online.
Product key technical feature based on patent 1 is as follows:
(1) feature in measuring principle
This patent adopts differential comparison method, by online compensation, the nonlinear measurement of capacitance method is changed into difference measurement, the Single Capacitance of the base number of a tender parameter of capacitance measurement reaches the duration of charging of setting voltage, and this patent measures voltage difference when same charging source charges to differential capacitance.
(2) feature on apparatus structure
Three coaxial tubular conductors form differential capacitance sensor, and measurement module and sensor integration, in one, adopt general digital equipment reading and display.
3. protection domain
(1) the oil product octane number determination product based on above-mentioned thinking should within scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410009318.6A CN104777198A (en) | 2014-01-09 | 2014-01-09 | Differential comparison method octane value determinator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410009318.6A CN104777198A (en) | 2014-01-09 | 2014-01-09 | Differential comparison method octane value determinator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104777198A true CN104777198A (en) | 2015-07-15 |
Family
ID=53618800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410009318.6A Pending CN104777198A (en) | 2014-01-09 | 2014-01-09 | Differential comparison method octane value determinator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104777198A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105717272A (en) * | 2016-04-06 | 2016-06-29 | 成都天丰清洁能源发展有限公司 | Test method of gasoline octane numbers |
| CN113484375A (en) * | 2021-07-23 | 2021-10-08 | 中国水利水电科学研究院 | Octane number determination system based on differential comparison |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2268258Y (en) * | 1996-03-14 | 1997-11-19 | 孙威 | Sensor for measuring gasoline octane value |
| CN1191311A (en) * | 1996-10-29 | 1998-08-26 | 孙威 | Method and device for monitoring gasoline fractional group composition and octane number |
| CN2392179Y (en) * | 1999-06-15 | 2000-08-16 | 孙威 | On-line measuring sensor device for petroleum |
| CN1442689A (en) * | 2003-01-30 | 2003-09-17 | 燕山大学 | Gasoline octane value detecting apparatus |
| CN1912607A (en) * | 2006-07-07 | 2007-02-14 | 南京大学 | Portable gasoline grade measuring method and instrument of using locking method |
| CN201348620Y (en) * | 2008-12-24 | 2009-11-18 | 西安天厚滤清技术有限责任公司 | Octane number gasoline tester capable of detecting carbinol and ethanol simultaneously |
| CN101762621A (en) * | 2008-12-24 | 2010-06-30 | 西安天厚滤清技术有限责任公司 | Gasoline tester capable of detecting octane values of methanol and ethanol simultaneously |
| CN201569638U (en) * | 2009-12-17 | 2010-09-01 | 长春市大周电子技术有限公司 | Gasoline octane rating tester |
-
2014
- 2014-01-09 CN CN201410009318.6A patent/CN104777198A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2268258Y (en) * | 1996-03-14 | 1997-11-19 | 孙威 | Sensor for measuring gasoline octane value |
| CN1191311A (en) * | 1996-10-29 | 1998-08-26 | 孙威 | Method and device for monitoring gasoline fractional group composition and octane number |
| CN2392179Y (en) * | 1999-06-15 | 2000-08-16 | 孙威 | On-line measuring sensor device for petroleum |
| CN1442689A (en) * | 2003-01-30 | 2003-09-17 | 燕山大学 | Gasoline octane value detecting apparatus |
| CN1912607A (en) * | 2006-07-07 | 2007-02-14 | 南京大学 | Portable gasoline grade measuring method and instrument of using locking method |
| CN201348620Y (en) * | 2008-12-24 | 2009-11-18 | 西安天厚滤清技术有限责任公司 | Octane number gasoline tester capable of detecting carbinol and ethanol simultaneously |
| CN101762621A (en) * | 2008-12-24 | 2010-06-30 | 西安天厚滤清技术有限责任公司 | Gasoline tester capable of detecting octane values of methanol and ethanol simultaneously |
| CN201569638U (en) * | 2009-12-17 | 2010-09-01 | 长春市大周电子技术有限公司 | Gasoline octane rating tester |
Non-Patent Citations (2)
| Title |
|---|
| 赵湛 等.: "《基于传感技术的辛烷值测量》", 《传感器技术》 * |
| 金海龙.: "《高精度汽油辛烷值测定仪的开发研究》", 《计算机自动测量与控制》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105717272A (en) * | 2016-04-06 | 2016-06-29 | 成都天丰清洁能源发展有限公司 | Test method of gasoline octane numbers |
| CN105717272B (en) * | 2016-04-06 | 2018-08-10 | 成都天丰清洁能源发展有限公司 | A kind of test method of octane number |
| CN113484375A (en) * | 2021-07-23 | 2021-10-08 | 中国水利水电科学研究院 | Octane number determination system based on differential comparison |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101435788B (en) | On-line oil liquid monitoring sensor based on permittivity measurement and system thereof | |
| CN102866375B (en) | System and method for calibrating receiving performance of partial-discharge ultrahigh frequency detection device | |
| CN100582808C (en) | Measurement method of ferroelectric materials electric hysteresis loop wire | |
| CN202854315U (en) | System for calibrating receiving performance of partial-discharge ultrahigh frequency detection device | |
| CN101782535A (en) | Sensor for TDR soil moisture measuring instrument based on phase detection principle | |
| CN101968536A (en) | Induction voltage divider based method for judging detection error exception of voltage transformer | |
| CN104931914A (en) | Analog field high voltage energy meter calibration system | |
| CN103063926B (en) | A kind of method of testing of low-voltage power line narrowband carrier termination and proving installation | |
| CN102269723B (en) | Method and device for measuring water content of crude oil based on thermal diffusion | |
| CN102193029B (en) | Method for measuring short-term frequency stability of unconventional sampling time | |
| CN104777198A (en) | Differential comparison method octane value determinator | |
| CN104749544A (en) | Electromagnetic compatibility current probe transmission resistance temperature error correction method | |
| CN104502998A (en) | Characteristic parameter tester and testing method for seismic detector | |
| CN104678339B (en) | Calibration device, system and method for probe type microwave voltage measurement system | |
| CN102495082A (en) | Microwave on-line detection device of ethanol water solution components and detection method thereof | |
| US11815484B2 (en) | Device for measuring complex dielectric permittivity of a material-under-test, measuring device for multiple reflections of time-domain signals of a complex dielectric and measuring method thereof | |
| Zhu et al. | Review and prospect of determination methods of water content in crude oil | |
| CN106197697A (en) | A kind of temperature-detecting device | |
| CN204902951U (en) | Digital capacitanc level meter based on TDC chip technology | |
| CN106839972B (en) | A kind of interference signal processing method of full light fiber white light interference instrument | |
| CN105181080B (en) | A kind of digitlization capacitive level probe based on TDC chip technology | |
| CN110096676A (en) | A kind of metering-type optical current voltage combination transformer frequency analysis device and method | |
| CN113484375A (en) | Octane number determination system based on differential comparison | |
| CN215985075U (en) | High-precision electric spark leak detector calibrating device | |
| CN102662189B (en) | Method for radiation detection and analysis based on counter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| DD01 | Delivery of document by public notice |
Addressee: Song Deqi Document name: Notification to Make Rectification |
|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150715 |