CN104076130B - Non-dissolved water content quick determination method in jet fuel - Google Patents
Non-dissolved water content quick determination method in jet fuel Download PDFInfo
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- CN104076130B CN104076130B CN201410332291.4A CN201410332291A CN104076130B CN 104076130 B CN104076130 B CN 104076130B CN 201410332291 A CN201410332291 A CN 201410332291A CN 104076130 B CN104076130 B CN 104076130B
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Abstract
A kind of non-dissolved water content quick determination method in jet fuel, comprise: under condition of different temperatures, water is mixed with jet fuel, after thermal agitation, leave standstill, layering, and get supernatant liquid and test, the computing formula I of dissolved water content with variation of ambient temperature of described jet fuel is set up: under the varying environment humidity within the scope of design temperature according to test result, dissolved water content in jet fuel is tested, according to test result, the computing formula II that under being based upon varying environment humidity, the dissolved water content of described jet fuel changes with ambient humidity, and, measure the total liquid water content T in jet fuel sample to be measured, and according to aforementioned formula I, II calculates the dissolved water content R in jet fuel sample to be measured, and then know non-dissolved water content F in jet fuel sample to be measured, wherein, F=T-R.The invention has the advantages that: detection time is short, testing result is accurate, and error is little, is applicable to the field quick detection of moisture in jet fuel.
Description
Technical field
The present invention is specifically related to a kind of non-dissolved water content quick determination method in jet fuel, is applicable to the field quick detection of moisture in jet fuel.
Background technology
Jet fuel belongs to oils, is made up of, has certain water absorptivity multiple hydro carbons and arene material, therefore in storage, transport, filling and use procedure, is inevitably mixed into moisture.Moisture exists in two states in jet fuel: dissolved water and free water (non-dissolved water).When dissolved water content non-in fuel exceedes certain threshold value, directly can have influence on the service property (quality) of oil product and the normal work of Flying device equipment, therefore by the dissolved water content in Accurate Determining jet fuel, be conducive to the non-dissolved water content judged in jet fuel, for guaranteeing that fuel usability and flight safety have great importance.
In current jet fuel, the assay method of moisture is mainly divided into three major types: a class is ocular estimate, and the method measuring error is large, test data accuracy is not high; Another kind of is laboratory method, comprise solvent reflux extraction and Karl_Fischer method, there is the shortcoming that measuring error is large, test data accuracy is not high equally in the former, although the latter's measurement result is accurate, repeatability better, but test set-up procedure is complicated, is not suitable for the moisture measurement in fast-field evaluation oil product; Last class is fluorometry, and the method technical requirement is high, and minute is long, is not suitable for the Site Detection of moisture in oil product.
Further, aforesaid three class assay methods all cannot distinguish dissolved water and non-dissolved water content in oil sample, but not dissolved water content is jet fuel chemically examines the index paid close attention to the most.
Summary of the invention
For deficiency of the prior art, the object of the present invention is to provide a kind of non-dissolved water content quick determination method in jet fuel, it has easy and simple to handle, sampling is few, result is accurate, favorable reproducibility, and test fast, the advantages such as error is little, are applicable to the field quick detection of moisture in jet fuel.
For realizing aforementioned invention object, present invention employs following technical scheme:
A kind of non-dissolved water content quick determination method in jet fuel, comprising:
Under condition of different temperatures within the scope of the first design temperature, water volume ratio being greater than 0.5:1 mixes with jet fuel, after thermal agitation, standing, layering, and get supernatant liquid and test, record the dissolved water content under condition of different temperatures in jet fuel, and the computing formula I that the dissolved water content y being based upon described jet fuel within the scope of this first design temperature changes with environment temperature x:
Y=e
a*x+Bformula I
Wherein, A=0.022, B=3.778;
Under varying environment humidity in the second design temperature scope and set environment humidity range, dissolved water content in jet fuel is tested, record the dissolved water content under different humidity condition in jet fuel, and the computing formula that the dissolved water content Y being based upon described jet fuel in this second design temperature scope and this set environment humidity range changes with ambient humidity H:
Y=a+b*H ... formula II
Wherein, a=13.65, b=0.67;
And, measure the total liquid water content T in jet fuel sample to be measured, and calculate the dissolved water content R in jet fuel sample to be measured according to formula I and formula II, and then know the non-dissolved water content F in jet fuel sample to be measured, wherein, F=T-R.
Further, in described jet fuel, non-dissolved water content quick determination method comprises: adopt the dissolved water content in karl Fischer coulomb method measurement jet fuel or jet fuel sample to be measured.
Further, in described karl Fischer coulomb method, the described karl Fischer reagent adopted is mixed to form primarily of iodine, sulphuric dioxide, alcohols and organic base.
Preferably, described first design temperature scope and the second design temperature scope are-10 DEG C ~ 50 DEG C, are preferably 6 DEG C ~ 35 DEG C.
Particularly, described second design temperature scope is especially preferably 24 DEG C ~ 26 DEG C.
Preferably, described set environment humidity range is 10%-100%, is preferably 36% ~ 85%.
Compared with prior art, the present invention at least has the following advantages:
(1) the present invention establishes the relational expression that in jet fuel, moisture changes with environment temperature, humidity, under arbitrary temp, humidity can being calculated easily thus, dissolved water content in jet fuel, and then the field quick detection of aviation fuels quality can be realized, for determining that in jet fuel, non-dissolved water content provides a kind of quick, accurate, reliable method.
(2) detection method fast, accurately, favorable reproducibility, detect data and have good preci-sion and accuracy, conform to moisture laboratory determination method the data obtained, whole test process completed in 2-5 minute, far less than traditional ocular estimate and laboratory method (1 ~ 2 hour detection time), the quick detection of aviation fuels under emergency case can be realized;
(3) the present invention can utilize common micro-water analyzer and realize test, simple to operate, do not need to carry out Preparatory work of experiment work complicated in a large number, do not need before test to carry out pre-service to sample, and sample drawn amount is few, oil loss reduces, compared to traditional ocular estimate and solvent reflux extraction, laboratory personnel does not need to participate in pre-job training, skillfully can complete instrumentation, the moisture in Accurate Determining oil plant.
Accompanying drawing explanation
Fig. 1 be in the embodiment of the present invention 1 in jet fuel dissolved water content with the variation diagram of environment temperature;
Fig. 2 be in the embodiment of the present invention 2 in jet fuel dissolved water content with the variation diagram of ambient humidity.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be described in detail the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Embodiment 1
The experimental apparatus adopted in the present embodiment and reagent comprise: SC-3 micro-water analyzer, Zhonghui Instrument Co., Ltd.'s (based on work of karl Fischer coulomb method principle); Karl Fischer reagent, Zhonghui Instrument Co., Ltd.; No. 3 jet fuels (below also known as oil plant), commercially available approach obtains (meeting GB6537-94 " No. 3 jet fuels " index request).
The implementation process of the present embodiment is as follows:
First, application SC-3 type micro-water analyzer detects the moisture in No. 3 jet fuel sample (being called for short sample as follows), for deaeration humidity is on the impact of moisture in sample, in advance pre-service is carried out to sample, specifically comprise following operation: according to volume ratio 1:1, add pure water in the sample to which, leave standstill more than 48 hours (environmental test atmospheric humidity 100%), the water cut in working sample.Under varying environment temperature conditions, the testing result of moisture (condition of different temperatures does 5 parallel experiments respectively, averages) as shown in table 1 in No. 3 jet fuels.Further, in this oil plant, moisture variation with temperature trend is as shown in Figure 1.
Can find out, in the scope of temperature-10 DEG C ~ 50 DEG C, in No. 3 jet fuels, dissolved water content raises with temperature and increases in approximately linear, and variation tendency is stablized, and moisture (mg/L) with environment temperature (DEG C) variation relation formula is:
y＝e
A*x+B
Wherein A, B-coefficient (A=0.022, B=3.778); X-environment temperature.
Table 1 environment temperature is on the impact of No. 3 jet fuel water content detection results
Secondly, the temperature that controls environment is at-10 DEG C-50 DEG C, utilize the moisture in lower No. 3 jet fuels of SC-3 type micro-water analyzer mensuration varying environment humidity equally, the result of detection is as shown in table 2 (different humidity condition does 5 parallel experiments respectively, averages).In oil plant moisture with humidity variation tendency as shown in Figure 2.
Can find out, along with ambient humidity increases (ambient humidity 10% ~ 100%), in No. 3 jet fuels, dissolved water content linearly increases, and dissolving moisture Y (mg/L) with the variation relation formula of ambient humidity H (%) is:
Y=a+b*H ... formula II
Wherein a, b-coefficient (a=13.65, b=0.67); H-ambient humidity.
Table 2 ambient humidity is on the impact of No. 3 jet fuel water content detection results
Finally, separately get 3 groups of No. 3 jet fuels as testing sample, the temperature that controls environment 20 DEG C, humidity 34%, utilize micro-water analyzer respectively total moisture content (T) in working sample, more environmentally temperature and ambient humidity, on the impact of dissolved water content in sample, to calculate under this environmental baseline dissolved water content (R) in sample, and then obtain non-dissolved water content (F) in sample, i.e. F=T-R.Often organize sample and do 3 parallel laboratory tests, average, and testing result and Fluorometric assay result are compared, shown in testing result table 3.
Non-dissolved water content detection result in table 3 No. 3 jet fuels to be measured
Karl Fischer coulometric determination (also known as Ka Shi coulometry) according to table 3 testing result display fluorescence method and the present embodiment can detect the content of non-dissolved water in No. 3 jet fuels, the two testing result is basically identical, and the method described in the present embodiment that illustrates can realize quick, the Accurate Determining of non-dissolved water content in sample.
In addition, inventor, also according to the mode identical with embodiment 1, tests the non-dissolved water content in 1,2,4,5, No. 6 jet fuel, also can obtain substantially identical testing result.
It will be appreciated by those skilled in the art that above-described embodiment only illustrative principle of the present invention and effect thereof, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (3)
1. a non-dissolved water content quick determination method in jet fuel, is characterized in that comprising:
Under condition of different temperatures within the scope of the first design temperature, the water of volume ratio at more than 0.5:1 is mixed with jet fuel, after thermal agitation, standing, layering, and get supernatant liquid and test, record the dissolved water content under condition of different temperatures in jet fuel, and the computing formula I that the dissolved water content y being based upon described jet fuel within the scope of this first design temperature changes with environment temperature x:
Y=e
a*x+Bformula I
Wherein, A=0.022, B=3.778;
Under varying environment humidity in the second design temperature scope and set environment humidity range, dissolved water content in jet fuel is tested, record the dissolved water content under different humidity condition in jet fuel, and the computing formula that the dissolved water content Y being based upon described jet fuel in this second design temperature scope and this set environment humidity range changes with ambient humidity H:
Y=a+b*H ... formula II
Wherein, a=13.65, b=0.67;
And, measure the total liquid water content T in jet fuel sample to be measured, and calculate the dissolved water content R in jet fuel sample to be measured according to formula I and formula II, and then know the non-dissolved water content F in jet fuel sample to be measured, wherein, F=T-R;
Described first design temperature scope and the second design temperature scope are-10 DEG C ~ 50 DEG C, and described set environment humidity range is 10% ~ 100%.
2. non-dissolved water content quick determination method in jet fuel according to claim 1, is characterized in that comprising: adopt karl Fischer coulomb method to detect dissolved water content in jet fuel or jet fuel sample to be measured.
3. non-dissolved water content quick determination method in jet fuel according to claim 2, it is characterized in that, in described karl Fischer coulomb method, the karl Fischer reagent adopted is mixed to form primarily of iodine, sulphuric dioxide, alcohols and organic base.
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| CN106932317A (en) * | 2017-03-14 | 2017-07-07 | 中国人民解放军空军勤务学院 | A kind of non-dissolving water content on-line measuring device and detection method of jet fuel |
| CN106990105A (en) * | 2017-05-11 | 2017-07-28 | 中国民用航空总局第二研究所 | Test paper of Aviation Fuel micro-water content and preparation method thereof |
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| DE2906773C3 (en) * | 1979-02-21 | 1981-09-10 | Danninger, Heinz, 8000 München | Reagent for the determination of undissolved water in hydrocarbon mixtures |
| CN201096693Y (en) * | 2007-08-30 | 2008-08-06 | 中国人民解放军海军后勤技术装备研究所 | Quick testing instrument for water content |
| CN201188093Y (en) * | 2008-04-11 | 2009-01-28 | 潘济宁 | Fuel water-containing detection switch |
| WO2011064903A1 (en) * | 2009-11-30 | 2011-06-03 | トヨタ自動車株式会社 | Fuel tank system and fuel supply system |
| CN202421114U (en) * | 2011-12-01 | 2012-09-05 | 大连海事大学 | Marine intelligent on-line detection device for fuel oil moisture |
| CN102645526B (en) * | 2012-05-10 | 2015-03-11 | 大连交通大学 | Device for determining water content in petroleum products by using distillation method and method for device |
| CN103344667B (en) * | 2013-07-10 | 2015-08-19 | 中国人民解放军空军勤务学院 | Lubricating oil moisture calorimetric titration rapid assay methods |
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