CN106771046A - LNG quality device for fast detecting - Google Patents
LNG quality device for fast detecting Download PDFInfo
- Publication number
- CN106771046A CN106771046A CN201611125209.6A CN201611125209A CN106771046A CN 106771046 A CN106771046 A CN 106771046A CN 201611125209 A CN201611125209 A CN 201611125209A CN 106771046 A CN106771046 A CN 106771046A
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- CN
- China
- Prior art keywords
- lng
- liquid phase
- level gauge
- dielectric constant
- capacitance level
- 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.)
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Links
- 239000007791 liquid phase Substances 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 44
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims description 15
- 230000032258 transport Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 2
- 239000003949 liquefied natural gas Substances 0.000 description 50
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 30
- 229910052757 nitrogen Inorganic materials 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- SAZUGELZHZOXHB-UHFFFAOYSA-N acecarbromal Chemical compound CCC(Br)(CC)C(=O)NC(=O)NC(C)=O SAZUGELZHZOXHB-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000011005 laboratory method Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels, explosives
- G01N33/225—Gaseous fuels, e.g. natural gas
Abstract
The invention provides a kind of LNG qualities device for fast detecting, including capacitance level gauge, N number of cryogenic temperature sensor and M liquid phase dielectric constant detector, wherein：N number of cryogenic temperature sensor and liquid phase dielectric constant detector are arranged in the main body of capacitance level gauge；Capacitance level gauge is inserted in liquid phase medium LNG from conveying trough roof end；N, M are positive integer, N >=2 and M >=1.The device can be used for measuring the temperature and dielectric constant of liquid in tank car, and whether impurity is contained in may determine that LNG transport tank cars according to the measured value.
Description
Technical field
The present invention relates to liquefied natural gas Quality Detection technical field, more particularly to LNG qualities device for fast detecting.
Background technology
Liquefied natural gas (LNG) is more and more wider in the range of application of China as a kind of efficient green energy resource, natural gas
Liquefaction, storage and transporting equipment are also gradually improved.However, while LNG extensive uses, in the middle of some of domestic LNG industries
Business mixes liquid nitrogen earning price difference, about 3000-4000 yuan/ton between the two to seek interests in tank car is transported.Although to LNG's
Physical property will not have an impact, but during shipping storage, because thermal stratification can bring change to tank body stress distribution extremely, sternly
Tank body can be destroyed during weight.Additionally, the LNG calorific values of doping reduce, purity reduction can be certain using bringing to industrial production, user
Economic loss and harm.Therefore it is highly desirable to whether doping carries out on-line checking in LNG tank cars.
At present, mainly there are laboratory method and field experience criterion for the LNG transports doping method of inspection of tank car.It is real
Testing room method can be analyzed after gas or liquid sampling with chromatograph, but due to fluid density difference in tank car, be layered uneven, examination
Sample is unable to liquid distribution situation in accurate response tank car, it is impossible to estimate impurity content, and field sampling has limitation, cycle
Long, poor practicability.The actually more use of field experience criterion, paid close attention to when unloading fluid temperature and tank car pressure whether
Match somebody with somebody, or whether observation immersed pump cavitates, this kind of method relies on experience, and live influence factor is more, uncertain big, lacks and quantifies
Analysis.
The content of the invention
Technology solve problem of the invention is：There are LNG transport tank car doping behaviors for Some Domestic area, propose
A kind of LNG qualities device for fast detecting, the device can be used for measuring the temperature and dielectric constant of liquid in tank car,
Whether contain impurity in may determine that LNG transport tank cars according to the measured value.
Above-mentioned purpose of the invention is achieved by following technical solution：
LNG quality device for fast detecting, examines for the quality to the in-car liquid phase medium LNG for loading of LNG conveying troughs
Survey, specifically include capacitance level gauge, N number of temperature sensor and M liquid phase dielectric constant detector, wherein：N number of TEMP
Device and liquid phase dielectric constant detector are arranged in the main body of capacitance level gauge；LNG conveying trough roofs end offers liquid level survey
Amount interface, capacitance level gauge is from level gauging interface insertion liquid phase medium LNG；N, M are positive integer, N >=2 and M >=
1。
Above-mentioned LNG quality device for fast detecting, carries out LNG quality quick detections as follows：
(a), the temperature using the different liquid phase medium LNG being layered of N number of temperature sensor measurement, wherein：If N number of temperature
Difference between maximum temperature that sensor measurement is obtained and minimum temperature then judges the liquid phase medium more than setting threshold value
Mixed with impurity in LNG；If the difference between each measured temperature is respectively less than setting threshold value, into step (b)；
(b), using the liquid capacitance under the capacitance level gauge full liquid status of measurement tank car, and according to the liquid electric capacity
Value is calculated the Macro Dielectric Constant ε of conveying trough in-car LNG1；Recycle M different points of liquid phase dielectric constant detector measurement
The liquid dielectric of layer；Wherein：If the liquid dielectric and Macro Dielectric Constant ε1Between difference more than setting
Threshold value, then judge in the liquid phase medium LNG mixed with impurity.
Above-mentioned LNG quality device for fast detecting, the length of capacitance level gauge according to the depth-set of transport tank car, i.e.,
When capacitance level gauge is inserted in liquid phase medium LNG from level gauging interface, the top of capacitance level gauge is located at liquid level
More than measurement interface, and the spacing d in the distance from bottom conveying trough underbody portion of capacitance level gauge meets following condition：0<D≤D, D
It is the spacing thresholding of setting.
Above-mentioned LNG quality device for fast detecting, with 2 temperature sensors, i.e. N=2；Wherein, a TEMP
Device is arranged on the stage casing of capacitance level gauge main body, and another temperature sensor is arranged on the bottom of capacitance level gauge main body,
It is respectively used to carry out temperature survey to the liquid phase medium in conveying trough in-car intermediate layer and bottom.
Above-mentioned LNG quality device for fast detecting, with 1 liquid phase dielectric constant detector, i.e. M=1；The liquid phase is situated between
Electric constant detector is arranged on the stage casing of capacitance level gauge main body, is carried out for the liquid phase medium to conveying trough in-car intermediate layer
Dielectric constant measurement.
The present invention has the advantages that compared with prior art：
(1), the present invention in, by the use of capacitance level gauge as mounting body, in the main body mounting temperature sensor and
Liquid phase dielectric constant detector, temperature and dielectric constant for measuring the in-car liquid phase medium of conveying trough, these test datas
Can be used to carrying out quality to in-car LNG being analyzed；
(2), simple structure of the present invention, the level gauging interface reserved using tank car is installed, with larger general
Property, and on-line checking can be realized, practicality is stronger.
Brief description of the drawings
Fig. 1 is LNG qualities device for fast detecting structural representation of the invention.
Specific embodiment
The present invention is further detailed explanation with specific embodiment below in conjunction with the accompanying drawings.
The invention provides a kind of LNG qualities device for fast detecting, the device technique is simple, highly reliable, economical and practical,
Can be used for detect LNG transport tank car whether doping.Because cryogenic liquid density, boiling point are different after doping, therefore can lead to
The temperature crossed after detection layering discriminates whether doping.In addition whether doping influences very little to gas phase dielectric constant, and right
The influence of liquid phase dielectric constant is larger, and liquid dielectric can be detected by capacitance level gauge under the full liquid status of tank car based on this
Constant judges doping content.The present invention can effectively contain illegal businessman's illegal operation, it is to avoid the economic damage brought with this
Lose.
As shown in figure 1, LNG qualities device for fast detecting of the invention, including capacitance level gauge 1, N number of temperature sensor
2 and M liquid phase dielectric constant detector 3, wherein：N number of temperature sensor 2 and liquid phase dielectric constant detector 3 are arranged on electric capacity
In the main body of formula liquid level gauge 1；LNG transports tank car 5 top offers level gauging interface, and capacitance level gauge 1 is from the liquid level
In measurement interface insertion liquid phase medium LNG4；N, M are positive integer, N >=2 and M >=1.
Wherein, capacitance level gauge is used to measure liquid capacitance under the full liquid status of tank car, can be with according to the capacitance
It is calculated the Macro Dielectric Constant ε of conveying trough in-car LNG1.When concrete engineering is realized, the length root of capacitance level gauge 1
According to the depth-set of transport tank car 5, i.e., when capacitance level gauge 1 is inserted in liquid phase medium LNG4 from level gauging interface,
The top of capacitance level gauge 1 is located at more than level gauging interface, and the distance from bottom of capacitance level gauge 1 transports the bottom of tank car 5
The spacing d in portion meets following condition：0<D≤D, D are the spacing thresholding of setting.
The temperature of the liquid phase medium LNG that N number of temperature sensor is used for after different layerings, according to the temperature difference of different layerings, sentences
It is disconnected whether doping.I.e.：If the difference between the maximum temperature that N number of temperature sensor measurement is obtained and minimum temperature is more than set
Determine threshold value, then may determine that in liquid phase medium LNG mixed with impurity.As shown in figure 1, be provided with 2 temperature sensors altogether, i.e.,
N=2.Wherein, installed in the stage casing of the main body of capacitance level gauge 1, another temperature sensor is arranged on a temperature sensor
The bottom of the main body of capacitance level gauge 1, is respectively used to enter trip temperature survey to the liquid phase medium of intermediate layer and bottom in transport tank car 5
Amount.
During for judgement cannot be doped using the temperature difference, can be made a distinction by the dielectric constant of liquid phase medium LNG,
Concrete methods of realizing is as follows：First using the liquid capacitance under the full liquid status of measurement tank car of capacitance level gauge 1；Then basis
The capacitance is calculated the Macro Dielectric Constant ε of conveying trough in-car LNG1；M liquid phase dielectric constant detector 3 is recycled to survey
The liquid dielectric of different layerings is measured, as these dielectric constant measurement values and Macro Dielectric Constant ε1Between difference more than setting
When determining threshold value, then can determine whether in liquid phase medium LNG mixed with impurity.Wherein, if it is known that dopant composition, then can basis
Layering dielectric constant estimates doping.As shown in figure 1, there is provided 1 liquid phase dielectric constant detector 3, i.e. M=1；This states liquid
Phase dielectric constant detector is arranged on the stage casing of the main body of capacitance level gauge 1, is situated between for the liquid phase to intermediate layer in transport tank car 5
Matter carries out dielectric constant measurement.
Embodiment：
In this embodiment, LNG qualities device for fast detecting includes 1,2 temperature sensors 2 of capacitance level gauge and 1
Liquid phase dielectric constant detector 3.Wherein, 2 temperature sensors 2 are separately mounted to the stage casing and bottom of the main body of capacitance level gauge 1
Portion；Liquid phase dielectric constant detector 3 is arranged on the main body stage casing of capacitance level gauge 1.In this embodiment, liquid phase medium is set
Mixed with liquid nitrogen in LNG4.
Under normal pressure：LNG temperature is -162 DEG C, density about 450kg/m3；Liquid nitrogen temperature is -196 DEG C, density about 810kg/
m3；The two density difference causes layering, and tank car bottom liquid nitrogen content is high, and then tank car bottom temp is low to mix liquid nitrogen.In detection process,
The temperature T2 of tank car centre position temperature T1 and bottom is measured by the cryogenic temperature sensor being arranged on capacitance level gauge,
T1 is approximately equal to T2, then do not mix liquid nitrogen；If mixing liquid nitrogen, T2 can be significantly lower than T1.But be also possible to the impurity boiling point that mixes in LNG with
LNG is close, then be difficult to be confirmed whether to be mixed into impurity by the method for C.T, therefore can be by the method for Measuring Dielectric Constant
To do further checking.
Under standard state, the relative dielectric constant of LNG and liquid nitrogen is respectively 1.6 and 1.433, if mixing liquid nitrogen ratio for 5%-
20%, corresponding dielectric constant is 1.592-1.56 after mixing.For whether checking LNG mixes liquid nitrogen, in the full liquid status of transport tank car
Under, measure the Macro Dielectric Constant ε 1 of LNG in tank car, then the liquid phase dielectric constant detector by being arranged on capacitance level gauge
The permittivity ε 2 of the following liquid of liquid level in the middle of detection.Compare ε 1 and ε 2, if the two numerical value is 1.6 or so, LNG does not mix liquid
Nitrogen；If ε 2 is significantly less than ε 1, illustrate that LNG mixes liquid nitrogen.If because it is high to mix liquid nitrogen tank underbody portion liquid nitrogen content, measuring dielectric constant
Can be lower, and the content of liquid nitrogen can be estimated with interpolation method accordingly.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (5)
1.LNG quality device for fast detecting, the quality for transporting the liquid phase medium LNG (4) loaded in tank car (5) to LNG is entered
Row detection, it is characterised in that：Including capacitance level gauge (1), N number of temperature sensor (2) and M liquid phase dielectric constant detector
(3), wherein：The main body of N number of temperature sensor (2) and liquid phase dielectric constant detector (3) installed in capacitance level gauge (1)
On；LNG transports tank car (5) top offers level gauging interface, and capacitance level gauge (1) is inserted from the level gauging interface
In liquid phase medium LNG (4)；N, M are positive integer, N >=2 and M >=1.
2. LNG qualities device for fast detecting according to claim 1, it is characterised in that：Carry out LNG quality quick detections
Method is as follows：
(a), measured using N number of temperature sensor (2) different layerings liquid phase medium LNG temperature, wherein：If N number of temperature
The difference that sensor (2) is measured between the maximum temperature and minimum temperature for obtaining is more than setting threshold value, then judge the liquid phase
Mixed with impurity in medium LNG；If the difference between each measured temperature is respectively less than setting threshold value, into step (b)；
(b), using the liquid capacitance under capacitance level gauge (1) the full liquid status of measurement tank car, and according to the liquid electric capacity
Value is calculated the Macro Dielectric Constant ε of conveying trough in-car LNG1；Recycle M liquid phase dielectric constant detector (3) measurement not
With the liquid dielectric of layering；Wherein：If the liquid dielectric and Macro Dielectric Constant ε1Between difference be more than
Given threshold, then judge in the liquid phase medium LNG mixed with impurity.
3. LNG qualities device for fast detecting according to claim 1, it is characterised in that：The length of capacitance level gauge (1)
According to the depth-set of transport tank car (5), i.e., when capacitance level gauge (1) is inserted in liquid phase medium LNG from level gauging interface
(4) when in, the top of capacitance level gauge (1) is located at more than level gauging interface, and capacitance level gauge (1) distance from bottom
The spacing d for transporting tank car (5) bottom meets following condition：0<D≤D, D are the spacing thresholding of setting.
4. LNG qualities device for fast detecting according to claim 1, it is characterised in that：With 2 temperature sensors, i.e. N
=2；Wherein, installed in the stage casing of capacitance level gauge (1) main body, another temperature sensor is arranged on a temperature sensor
The bottom of capacitance level gauge (1) main body, is respectively used to carry out temperature to the liquid phase medium in transport tank car (5) interior intermediate layer and bottom
Degree measurement.
5. LNG qualities device for fast detecting according to claim 1, it is characterised in that：With 1 liquid phase dielectric constant inspection
Survey device (3), i.e. M=1；The liquid phase dielectric constant detector (3) is used for installed in the stage casing of capacitance level gauge (1) main body
Liquid phase medium to transporting tank car (5) interior intermediate layer carries out dielectric constant measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611125209.6A CN106771046A (en) | 2016-12-08 | 2016-12-08 | LNG quality device for fast detecting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611125209.6A CN106771046A (en) | 2016-12-08 | 2016-12-08 | LNG quality device for fast detecting |
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| Publication Number | Publication Date |
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| CN106771046A true CN106771046A (en) | 2017-05-31 |
Family
ID=58881808
Family Applications (1)
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|---|---|---|---|
| CN201611125209.6A Pending CN106771046A (en) | 2016-12-08 | 2016-12-08 | LNG quality device for fast detecting |
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|---|---|---|---|---|
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-
2016
- 2016-12-08 CN CN201611125209.6A patent/CN106771046A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Xing Inventor after: Liang Huacheng Inventor after: Li Shanfeng Inventor after: Su Tao Inventor after: Cao Jian Inventor after: Shang Yu Inventor after: Zhao Shanshan Inventor before: Li Xing Inventor before: Liang Huacheng Inventor before: Li Shanfeng Inventor before: Su Tao Inventor before: Shang Yu Inventor before: Zhao Shanshan |