CN109507268A - A kind of micro free water content analysis method in aviation kerosine - Google Patents
A kind of micro free water content analysis method in aviation kerosine Download PDFInfo
- Publication number
- CN109507268A CN109507268A CN201811519465.2A CN201811519465A CN109507268A CN 109507268 A CN109507268 A CN 109507268A CN 201811519465 A CN201811519465 A CN 201811519465A CN 109507268 A CN109507268 A CN 109507268A
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- China
- Prior art keywords
- oil liquid
- liquid sample
- aviation kerosine
- container
- moisture content
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/42—Measuring deposition or liberation of materials from an electrolyte; Coulometry, i.e. measuring coulomb-equivalent of material in an electrolyte
- G01N27/423—Coulometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
Abstract
The present invention provides a kind of micro free water content analysis method in aviation kerosine, comprising the following steps: samples aviation kerosine oil liquid sample by the first container, acutely rocks to the oil liquid sample sampled；Aviation kerosine oil liquid sample in the first container is heated, 75 DEG C -85 DEG C, and continuous heating setting time are heated to；The oil liquid sample after heating is extracted using second container, as small sample to be analyzed；The oil liquid sample moisture content of small sample is analyzed by coulomb method；The small sample of extraction is carried out with group repeatedly analysis；If the oil liquid sample moisture content discreteness measured for several times is more than preset range, determine that this time measurement is invalid；If the oil liquid sample moisture content discreteness measured for several times is within a preset range, determine that this time measurement is effective；The mean value of oil liquid sample moisture content when measuring effective is calculated, and is converted into aviation kerosine volumetric(al) moisture content.Operation of the present invention is simple, and can reduce micro-water content analytical error in aviation kerosine.
Description
Technical field
The invention belongs to hydraulic machinery technical field, it is related to a kind of micro free water content analysis method in aviation kerosine.
Background technique
Hydro-mechanical unit is the important component of aeroengine control system, and working media is generally aviation coal
Oil.Aircraft flies under cryogenic for a long time, and the moisture being mixed into aviation kerosine can be precipitated and glaciation.Ice crystal easily blocks
Valve or filter etc. cause hydro-mechanical unit disabler can not be to engine normal fuel injection, and then engine are caused to put out
Fire jeopardizes Flight Safety.Therefore domestic and international airworthiness regulation etc. is distinctly claimed engine fuel oil system and passes through fuel oil icing
The examination of test.
Fuel oil icing tests process need to detect the ice crystal (moisture content i.e. in aviation kerosine) in aviation kerosine.
Conventional method substantially conforms to " the measurement karl Fischer of water content in GB/T 11133-1993 oil product, lubricating oil and additive
Coulometric titration " regulation.Moisture in oil liquid sample exists in the form of water and two kinds of free water to dissolve, and dissolution water distribution is uniform
But few, free water is unevenly distributed but accounts for relatively high, therefore the liquid that syringe is drawn into every time does not necessarily represent aviation coal
True water content in oil, and the influence that the error cannot also be effectively reduced only is averaged by repeatedly measurement.
In order to solve the problems, such as that free water is unevenly distributed in aviation kerosine, isopropanol extraction method can also be usually used
Or methanol extraction.Both methods is all that organic solvent is added into oil liquid sample, is then acutely rocked, and is stood until liquid
It is divided into two layers of organic solvent of aviation kerosine/containing whole water, therefore extracts the organic solvent containing whole water and carry out analysis and can get
Whole biodiversities contained by this bottle of sample.Methanol water imbibition itself is too strong, is easy to absorb in air in operation
Moisture may cause and measure water content increase.Isopropanol extraction method acquired results are more accurate, but compare GB/T 11133-
1993 standard methods recommended increase metering isopropanol volume and metering aviation kerosine volume, and efficiency is not high.With
Upper two methods all refer to toxic organic solvents, also there is higher requirement to experimental enviroment.
Summary of the invention
It is an object of the present invention to overcome the shortcomings of the prior art and provide micro free water in a kind of aviation kerosine
Content analysis method can not only reduce micro-water content analytical error in aviation kerosine, but also need not increase multioperation, quick quasi-
The true lab analysis demand for meeting engine fuel icing tests.The technical solution adopted by the present invention is that:
A kind of micro free water content analysis method in aviation kerosine, comprising the following steps:
Step S1 samples aviation kerosine oil liquid sample by the first container, acutely shakes to the oil liquid sample sampled
It shakes；
Step S2 heats the aviation kerosine oil liquid sample in the first container, is heated to 75 DEG C -85 DEG C, and continue
The heating setpoint time；
Step S3 extracts the oil liquid sample after heating using second container, as small sample to be analyzed；
Step S4 analyzes the oil liquid sample moisture content of small sample by coulomb method；
Step S5 carries out with group repeatedly analysis the small sample of extraction；If the oil liquid sample moisture content measured for several times is discrete
Property be more than preset range, then determine this time measurement in vain；If the oil liquid sample moisture content discreteness measured for several times is in preset range
It is interior, then determine that this time measurement is effective；
Step S6, calculates the mean value of oil liquid sample moisture content when measuring effective, and is converted into aviation kerosine volume of aqueous
Amount.
Further, the setting time in step S2 is -40 minutes 20 minutes.
Further, second container volume is less than the first container.
Further, second container uses syringe.
Further, in step S5, more parts of individually tests are divided into the small sample in second container.
The present invention has the advantages that moisture measurement precision is higher by heating and violent shaking means, and operate letter
Easily, without the volume of accurate measurement sampling oil liquid, other organic solvents, the certain batch aviation of the realization of safe and convenient are not also introduced
The analysis of micro-moisture in kerosene sample, to realizing that aero-engine fuel oil icing tests have important basic meaning and practical
Value.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
Below with reference to specific drawings and examples, the invention will be further described.
It can learn that temperature is higher according to Henry Theorem, solubility of the water in aviation kerosine is also higher, and solubilised state
Moisture is uniformly distributed in aviation kerosine, so uniform moisture can be made to be distributed by heating aviation kerosine；
The analysis of moisture content work of fuel oil icing tests usually only needs to carry out in this section 50ppm-300ppm, therefore
As long as heating makes the water solubility of aviation kerosine be more than that 300ppm can meet application requirement.No. 3 jet fuels (trade mark RP-3)
The most widely used aviation kerosine of domestic air mail engine, documents and materials be described in detail RP-3 water solubility and temperature it
Between relationship, as shown in table 1.RP-3 aviation kerosine can reach the water solubility of 262ppm at 60 DEG C, if continuing to increase temperature,
It is entirely capable of covering this measurement range of 50ppm-300ppm.
| Oil temperature, DEG C | -40 | -30 | -20 | -10 | 0 | 10 |
| Water solubility, ppm | 8 | 12 | 19 | 29 | 42 | 61 |
| Oil temperature, DEG C | 20 | 30 | 40 | 50 | 60 | |
| Water solubility, ppm | 85 | 116 | 154 | 203 | 262 |
Solubility of the table 1 by SY2122 measurement water in RP-3
The present invention proposes a kind of micro free water content analysis method in aviation kerosine as a result, comprising the following steps:
Step S1, acutely rocks: sampling aviation kerosine oil liquid sample, the oil liquid sample that initial sample obtains by sampling bottle
Biggish water body may be contained, be unfavorable for dissolving by heating, this step breaks up biggish water body as far as possible, and moisture dispersion is made to be free in boat
In empty kerosene；
Step S2, heating: choosing suitable heating temperature according to the theoretical water content of the oil liquid sample, guarantees all free
Water is substantially dissolved in oil liquid sample；Oven temperature is set as between 75 DEG C -85 DEG C, sampling bottle is put into baking oven, continuous heating
- 40 minutes 20 minutes；
Step S3 extracts small sample: the oil liquid sample after heating is extracted using one-shot injector, as sample to be analyzed
Product；Since moisture is completely dissolved in aviation kerosine, which can characterize the aqueous of aviation kerosine in sampling bottle
Amount state；
The analysis of coulomb method: step S4 uses the oil liquid sample moisture content of coulomb instrument analysis small sample；Small sample is injected into
It is analyzed in coulomb instrument, records the water content result obtained；
Step S5, with group repeatedly analysis: it is uniformly distributed in aviation kerosine for confirmation moisture, it need to be to the sample in syringe
Product are divided into more parts of individually tests；If the oil liquid sample moisture content discreteness measured for several times is more than preset range, the secondary survey is determined
Amount is invalid；If the oil liquid sample moisture content discreteness measured for several times is within a preset range, determine that this time measurement is effective；
Step S6, data processing: coulomb instrument will provide respectively analysis of moisture content several times as a result, taking when measuring effective
Value, and aviation kerosine volumetric(al) moisture content is converted into according to the density ratio of aviation kerosine and water.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (5)
1. a kind of micro free water content analysis method in aviation kerosine, which comprises the following steps:
Step S1 samples aviation kerosine oil liquid sample by the first container, acutely rocks to the oil liquid sample sampled；
Step S2 heats the aviation kerosine oil liquid sample in the first container, is heated to 75 DEG C -85 DEG C, and continuous heating
Setting time；
Step S3 extracts the oil liquid sample after heating using second container, as small sample to be analyzed；
Step S4 analyzes the oil liquid sample moisture content of small sample by coulomb method；
Step S5 carries out with group repeatedly analysis the small sample of extraction；If the oil liquid sample moisture content discreteness measured for several times is super
Preset range is crossed, then determines that this time measurement is invalid；If the oil liquid sample moisture content discreteness measured for several times is within a preset range,
Determine that this time measurement is effective；
Step S6, calculates the mean value of oil liquid sample moisture content when measuring effective, and is converted into aviation kerosine volumetric(al) moisture content.
2. micro free water content analysis method in aviation kerosine as described in claim 1, which is characterized in that
Setting time in step S2 is -40 minutes 20 minutes.
3. micro free water content analysis method in aviation kerosine as described in claim 1, which is characterized in that
Second container volume is less than the first container.
4. micro free water content analysis method in aviation kerosine as claimed in claim 3, which is characterized in that
Second container uses syringe.
5. micro free water content analysis method in aviation kerosine as described in claim 1, which is characterized in that
In step S5, more parts of individually tests are divided into the small sample in second container.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322758A (en) * | 2021-12-07 | 2022-04-12 | 中国航发控制系统研究所 | Optical measurement method for ice crystals in flowing fuel oil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322758A (en) * | 2021-12-07 | 2022-04-12 | 中国航发控制系统研究所 | Optical measurement method for ice crystals in flowing fuel oil |
| CN114322758B (en) * | 2021-12-07 | 2023-05-23 | 中国航发控制系统研究所 | Optical measurement method for ice crystal in flowing fuel |
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